WO2024090100A1 - Electronic timepiece - Google Patents

Electronic timepiece Download PDF

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Publication number
WO2024090100A1
WO2024090100A1 PCT/JP2023/034951 JP2023034951W WO2024090100A1 WO 2024090100 A1 WO2024090100 A1 WO 2024090100A1 JP 2023034951 W JP2023034951 W JP 2023034951W WO 2024090100 A1 WO2024090100 A1 WO 2024090100A1
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WO
WIPO (PCT)
Prior art keywords
moon
lunar
board
age
current
Prior art date
Application number
PCT/JP2023/034951
Other languages
French (fr)
Japanese (ja)
Inventor
大輔 原口
和貴 五十嵐
Original Assignee
シチズン時計株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シチズン時計株式会社 filed Critical シチズン時計株式会社
Publication of WO2024090100A1 publication Critical patent/WO2024090100A1/en

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/26—Clocks or watches with indicators for tides, for the phases of the moon, or the like
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means

Definitions

  • the present invention relates to an electronic watch.
  • Some watches have a time display section and a moon phase display section that displays the phases of the moon, i.e., the lunar phase, providing the user with a moon phase display corresponding to the age of the moon at the current date and time.
  • the moon phase display section has an opening for the moon phase plate formed in the dial, and a moon phase plate that displays the moon (full moon) and is driven to rotate, and the moon phase plate rotates in one direction relative to the opening for the moon phase plate to display the moon phase corresponding to the age of the moon.
  • the corresponding watch's moon phase display will also differ. Specifically, for the same date, time, and longitude (predetermined lunar age), the direction of change in the lunar phase display over time will differ. Therefore, the position and rotation direction of the lunar phase plate relative to the lunar phase plate opening will differ depending on whether the user who owns the watch is located in the northern or southern hemisphere.
  • the control circuit When the electronic watch switches between the northern hemisphere display mode and the southern hemisphere display mode of the lunar phase display section, the control circuit changes the rotation direction of the moon phase plate and rotates the moon phase plate to the post-movement rotational position.
  • the control circuit calculates the post-movement hemispheric lunar age based on the current date and time as in Patent Document 1 and rotates the moon age plate to a post-movement rotation position corresponding to the calculated post-movement hemispheric lunar age, the calculation of the post-movement hemispheric lunar age is complicated and the calculation load of the control circuit is high, so there is a problem that power consumption increases when high-load processing is performed every time the display mode is switched.
  • the present invention has been made in consideration of the above, and aims to propose an electronic watch that can reduce the computational load on the control circuit when switching the display mode of the moon phase display section.
  • the electronic timepiece in this embodiment includes a time display unit that displays the time based on an internal time, a moon phase display unit that has at least a moon phase plate supported so as to be freely rotatable and that displays the moon phase corresponding to the age of the moon as the moon phase plate rotates, a moon phase plate actuator that drives the moon phase plate to rotate, a control circuit that controls the moon phase plate rotation direction and the moon phase plate rotation position by the moon phase plate actuator, and a northern hemisphere display mode that displays the moon phase in at least the northern hemisphere and a southern hemisphere display mode that displays the moon phase in the southern hemisphere.
  • the control circuit determines that the operation for switching the display mode has been performed by the operation unit, the control circuit rotates the lunar phase plate from the current lunar phase plate rotation position to a post-switched lunar phase plate rotation position that is away from the reference lunar phase by the reference lunar phase difference on the opposite side to the current lunar phase plate rotation direction, when the lunar phase difference of the current lunar phase plate based on the current lunar phase plate rotation position relative to the reference lunar phase is set as the reference lunar phase difference, by using the lunar phase plate actuator to rotate the lunar phase plate from the current lunar phase plate rotation position to a post-switched lunar phase plate rotation position that is away from the reference lunar phase by the reference lunar phase difference on the opposite side to the current lunar phase plate rotation direction, and is characterized in that the control circuit determines the lunar phase plate rotation direction as the post-switched lunar phase plate rotation direction that is opposite to the current lunar phase plate rotation direction.
  • the electronic watch of the present invention has the advantage of being able to reduce the computational load on the control circuit when switching the display mode of the moon phase display section.
  • FIG. 1 is a diagram showing the overall configuration of an electronic timepiece according to an embodiment of the present invention.
  • FIG. 2 is an explanatory diagram of the operation of the moon phase display unit of the electronic timepiece in this embodiment (northern hemisphere display mode).
  • FIG. 3 is an explanatory diagram of the operation of the moon phase display unit of the electronic timepiece in this embodiment (southern hemisphere display mode).
  • FIG. 4 is a block diagram of the movement of the electronic timepiece according to the embodiment.
  • FIG. 5 is a diagram illustrating the operation of the function display section during the display mode switching operation.
  • FIG. 6 is a diagram illustrating the operation of the function display section during the display mode switching operation.
  • FIG. 5 is a diagram illustrating the operation of the function display section during the display mode switching operation.
  • FIG. 7 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation.
  • FIG. 8 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation.
  • FIG. 9 is a flow diagram of the display mode switching operation of the electronic timepiece according to this embodiment.
  • FIG. 10 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation in the modified example.
  • FIG. 11 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation in the modified example.
  • FIG. 1 is an overall configuration diagram of an electronic watch in an embodiment.
  • FIG. 2 is an explanatory diagram of the operation of the moon phase display unit of the electronic watch in an embodiment (northern hemisphere display mode).
  • FIG. 3 is an explanatory diagram of the operation of the moon phase display unit of the electronic watch in an embodiment (southern hemisphere display mode).
  • FIG. 4 is a block diagram of the movement of the electronic watch in an embodiment.
  • FIG. 5 is an explanatory diagram of the operation of the function display unit during a display mode switching operation.
  • FIG. 6 is an explanatory diagram of the operation of the function display unit during a display mode switching operation.
  • FIG. 5 is an explanatory diagram of the operation of the function display unit during a display mode switching operation.
  • FIG. 7 is a diagram showing an example of the operation of the moon phase display unit during a display mode switching operation.
  • FIG. 8 is a diagram showing an example of the operation of the moon phase display unit during a display mode switching operation.
  • the X direction in FIGS. 1 to 3 and FIGS. 5 to 8 (including FIGS. 10 and 11) is the 12 o'clock and 6 o'clock direction of the electronic watch
  • the Y direction is the 3 o'clock and 9 o'clock direction of the electronic watch
  • the direction perpendicular to the X direction and the Y direction is the up-down direction (thickness direction) of the electronic watch.
  • O1 is the center of the electronic watch 1 and coincides with the axis of rotation of the pointer.
  • a direction in the XY plane centered on O1 is called a radial direction.
  • the electronic watch 1 in this embodiment is an electronic watch that keeps internal time based on the output of a crystal oscillator and indicates the kept time with hands 31.
  • the electronic watch 1 may be a multi-function electronic watch that has functions other than timekeeping, such as an alarm function or a chronograph.
  • it may be a terminal device-linked watch that is connected to an external terminal device via a communication unit, either wirelessly or wired, and realizes specific functions (e.g., an alarm function, a time correction function based on the internal time information of the terminal device, a notification function that notifies when email is received, etc.) based on requests set in the terminal device.
  • electronic watch 1 comprises an exterior case 2, a time display unit 3, a moon phase display unit 4, a function display unit 5, an operation unit 6, and a movement 7.
  • electronic watch 1 has a time display unit 3 that is an analog electronic wristwatch with an analog display, and a moon phase display unit 4 that is a moon phase watch that displays the phases of the moon, i.e., the lunar phase.
  • time display unit 3 that is an analog electronic wristwatch with an analog display
  • moon phase display unit 4 that is a moon phase watch that displays the phases of the moon, i.e., the lunar phase.
  • electronic watch 1 is described as being of the wristwatch type, it may be of another watch type, for example, a pocket watch type, so long as it has the functionality of a moon phase watch.
  • the exterior case 2 constitutes the outermost part of the electronic watch 1 and is composed of a body 21, a bezel 22, a crystal 23, and a back cover (not shown).
  • the body 21 has an opening, and the time display section 3, moon phase display section 4, function display section 5, and movement 7 are held in the internal space S1, which corresponds to the space inside the opening.
  • the body 21 is annular, and the opening is circular with the center O1 of the electronic watch 1 as its center.
  • the shape of the opening can be any shape to match the external shape of the exterior case 2 of the electronic watch 1 and the design.
  • the body 21 has tip lugs 24 formed to protrude from the 12 o'clock and 6 o'clock directions on the outer peripheral side. One end of the belt 8 is connected to the tip lug 24 on the 12 o'clock side, and the other end of the belt 8 is connected to the tip lug 24 on the 6 o'clock side.
  • the windshield 23 covers the upper opening on one side of the opening of the body 21, and the back cover covers the lower opening on the other side. By fixing them together, the internal space S1 becomes a closed space, and the time display unit 3, the moon phase display unit 4, the function display unit 5, and the movement 7 can be protected.
  • a waterproof member such as a rubber packing (not shown) can be used to increase the retention force and improve the dustproofness and waterproofness of the electronic watch 1.
  • the body 21 is made of, for example, a resin material, a metal material, or a ceramic material.
  • the bezel 22 fixes the windshield 23 to the body 21, is formed in an annular shape, and is fixed to the annular portion of the body 21 that constitutes the internal space S1.
  • the bezel 22 is located radially outward from the time display unit 3.
  • the bezel 22 is made of, for example, a resin material, a metal material, or a ceramic material.
  • the bezel 22 may be supported on the case 21 so as to be rotatable about the watch center O1 of the electronic watch 1.
  • the crystal 23 is shaped to cover the upper opening via the bezel 22, and is inserted from the upper side and fixed to the bezel 22, and is fixed to the case 21 via the bezel 22 to close the internal space S1.
  • the crystal 23 has a circular outer shape in a plan view.
  • the crystal 23 is made of, for example, glass or a transparent resin material.
  • the back cover has an engagement portion of approximately the same shape as the downward opening, and is inserted from the lower side and fixed to the case 21 to close the internal space S1.
  • the back cover has a circular outer shape.
  • the back cover is made of, for example, a resin material, a metal material, or a ceramic material, like the case 21.
  • the bezel 22 may be formed integrally with the case 21 as long as it does not rotate.
  • the time display unit 3 displays the time based on the internal time.
  • the time display unit 3 has hands 31, a dial 32, a dial cover 33, and a date dial 34.
  • the time display unit 3 displays the internal time (at least date information, hour information, minute information, and second information) kept by the control circuit 72 of the movement 7 (described later), i.e., displays the time.
  • the hands 31 are supported by the movement 7 so as to be rotatable around the clock center O1 of the electronic clock 1 as the axis of rotation, and are driven to rotate by the movement 7.
  • the hands 31 are rod-shaped and made of a metal material, a resin material, or the like.
  • the hands 31 are a second hand 31a, a minute hand 31b, and an hour hand 31c, and are positioned above the dial 32 (towards the crystal 23).
  • the hands 31 also rotate when the user operates the operating unit 6.
  • the hands 31 can display the time based on the internal time depending on the position they are pointing to.
  • the dial 32 is disposed between the hands 31 and the movement 7, and protects the movement 7.
  • the dial 32 has the function of providing the user with an aesthetic look of the electronic timepiece 1.
  • Hour characters 321, 322 are provided on the surface of the dial 32 (the side facing the crystal 23). In other words, the hour characters 321, 322 are disposed to face the crystal 23 in the vertical direction, and can be seen by the user through the crystal 23.
  • the user can recognize the current time based on the time display from the relative positions of the hands 31 (second hand 31a, minute hand 31b, and hour hand 31c) and the hour characters 321, 322.
  • the dial 32 is formed with a date plate opening 323 that allows the user to see the date plate 34 through the crystal 23.
  • the date plate opening 323 is formed in a position facing the date plate 34 in the vertical direction of the dial 32, and penetrates the dial 32 from top to bottom.
  • the date plate opening 323 is rectangular and is formed at the "4 o'clock" position on the dial 32.
  • the face ring 33 is positioned radially outward from the dial 32.
  • the face ring 33 is formed in an annular shape and is positioned radially outward from the tip of the hand 31.
  • the time display unit 3 can display information such as setting information corresponding to functions other than the time display function.
  • Information displays include ON/OFF settings for the alarm function, the set time for the alarm, chronograph display, time zone display, display related to reception operation, and daylight saving time setting display.
  • the dial 32 and face ring 33 are provided with function marks (not shown), and the setting information for each function based on the information display can be recognized based on the relative positions of the hands 31 (second hand 31a, minute hand 31b, hour hand 31c) and the function marks.
  • the date dial 34 rotates to display the date.
  • the date dial 34 When viewed from the top-bottom direction, the date dial 34 is formed in a circular shape, and is disposed between the dial 32 and the movement 7 in the top-bottom direction.
  • the date dial 34 is supported by the movement 7 so as to be freely rotatable, with the watch center O1 as the axis of rotation, and is driven to rotate by the movement 7.
  • the date dial 34 has multiple day marks 341 formed on it.
  • the day marks 341 are visible to the user through the date dial opening 323 and the crystal 23, and display the current date based on the internal time.
  • the day marks 341 are the numbers "1" to "31" corresponding to the days, and are formed clockwise in an area of one revolution of the date dial 34 in the circumferential direction.
  • the lunar phase display unit 4 displays the lunar phase corresponding to the age of the moon by rotating the lunar phase plate 42.
  • the lunar phase display unit 4 has an opening 41 for the lunar phase plate, the lunar phase plate 42, and lunar phase plate rotation direction marks 43, 44.
  • the opening 41 for the moon phase plate allows the user to view the moon phase plate 42 through the windshield 23.
  • the opening 41 for the moon phase plate is formed in the dial 32.
  • the opening 41 for the moon phase plate faces the moon phase plate 42 in the vertical direction, and is formed in an approximately fan-shaped shape at the 12 o'clock direction in the area where the dial 32 faces the moon phase plate 42.
  • the opening 41 for the moon phase plate has recesses 411, 412 formed at both ends in the moon phase plate rotation direction R.
  • the recesses 411, 412 indicate the phases of the moon when they overlap in the vertical direction with the moon marks 421, 422 on the moon phase plate 42, which will be described later.
  • the moon phase plate rotation direction R is a direction around the moon phase plate center O2 of the moon phase plate 42, and has two rotation directions: the current moon phase plate rotation direction RR and the switched moon phase plate rotation direction RC, which is opposite to the current moon phase plate rotation direction RR.
  • the opening 41 for the moon phase board (including the recesses 411 and 412) is shown with dotted lines to make it easier to understand the operation of the illustrated month marks 421 and 422.
  • the moon phase plate 42 rotates to display the phase of the moon corresponding to the age of the moon.
  • the moon phase plate 42 is formed in a circular shape when viewed from the top-bottom direction, and is arranged between the dial 32 and the movement 7 in the top-bottom direction.
  • the moon phase plate 42 is supported by the movement 7 so as to be freely rotatable, with the moon phase plate center O2 of the moon phase plate 42 as the rotation axis, and is rotated by the movement 7.
  • clockwise rotation of the moon phase plate 42 is forward rotation
  • counterclockwise rotation is reverse rotation, with the clockwise direction being the forward direction RY and the counterclockwise direction being the reverse direction RN.
  • the moon phase display unit 4 in this embodiment displays the moon phase corresponding to the moon age for two synodic cycles per rotation.
  • the moon marks 421, 422 in this embodiment are identical (same shape, color, etc.), and the user cannot distinguish between the moon marks 421, 422 even if he or she visually recognizes them.
  • the forward rotation direction RY of the moon phase board 42 becomes the current moon phase board rotation direction RR.
  • the lunar-age board rotation direction RR is the forward rotation direction RY
  • the reverse direction RN of the moon phase plate 42 becomes the current moon phase plate rotation direction RR.
  • the current rotation direction RR of the lunar phase plate is the reverse direction RN, as shown in FIG.
  • the moon phase plate rotation direction marks 43, 44 indicate the moon phase plate rotation direction R in each display mode D.
  • the moon phase plate rotation direction marks 43, 44 are provided on the surface of the dial 32.
  • the moon phase plate rotation direction mark 43 corresponds to the northern hemisphere display mode DN, and is composed of a clockwise arrow and the abbreviated English letter "N" corresponding to north.
  • the moon phase plate rotation direction mark 44 corresponds to the southern hemisphere display mode DS, and is composed of a counterclockwise arrow and the abbreviated English letter "S" corresponding to south.
  • the function display unit 5 displays the state of the electronic watch 1 based on a function different from the time display function of the electronic watch 1, i.e., displays the function.
  • the function display unit 5 has a function hand 51 and a function mark plate 52.
  • the function display unit 5 displays the current day of the week based on the internal time kept by the control circuit 72, i.e., displays the day of the week, displays the remaining charge of the secondary battery 76 measured by the control circuit 72, i.e., displays the remaining charge, and displays the display mode D of the moon phase display unit 4, which is either the northern hemisphere display mode DN or the southern hemisphere display mode DS stored in the control circuit 72, i.e., displays the display mode.
  • the function hand 51 is supported by the movement 7 so as to be rotatable around the center O3 of the function mark plate 52 as the axis of rotation, and is driven to rotate by the movement 7.
  • the function hand 51 is rod-shaped and made of a metal or resin material.
  • the function hand 51 is positioned above the function mark plate 52 (towards the windshield 23).
  • the function hand 51 rotates when the user operates the operating unit 6, that is, it indicates one of the above function displays.
  • the function hand 51 can display a function corresponding to each function depending on the position it is pointing to.
  • the function mark plate 52 is disposed between the function hand 51 and the movement 7.
  • the function mark plate 52 is formed as a part of the dial 32.
  • the function marks 521 to 524 are disposed so as to face the crystal 23 in the vertical direction, and can be seen by the user through the crystal 23. The user can recognize the state of the electronic watch 1 based on the function display from the relative positions of the function hand 51 and the function marks 521 to 524.
  • the day of the week mark 521 displays the current day of the week based on the position of the function hand 51.
  • the day of the week marks 521 in this embodiment are the abbreviated English letters "S", “M”, “T”, “W”, “T”, “F”, and "S” corresponding to each day of the week (Sunday to Saturday), and are formed clockwise in the area of the function mark plate 52 from the 2 o'clock direction to the 5 o'clock direction.
  • the remaining amount mark 522 indicates the remaining amount of the secondary battery 76 based on the position of the function hand 51.
  • the remaining amount mark 522 in this embodiment is a first remaining amount figure corresponding to the remaining amount, a second remaining amount figure narrower in the radial direction than the first remaining amount figure, a third remaining amount figure narrower in the radial direction than the second remaining amount figure, and a fourth remaining amount figure narrower in the radial direction than the third remaining amount figure, and are formed in a counterclockwise direction in the area from the 10 o'clock direction to the 6 o'clock direction on the function mark plate 52.
  • the display mode marks 523 and 524 correspond to the display mode D, and indicate the current display mode DR based on the position of the function hand 51.
  • the northern hemisphere display mode mark 523 in this embodiment is the abbreviated English letter "N” corresponding to north, and is formed in the area of the function mark plate 52 at the 1 o'clock direction.
  • the southern hemisphere display mode mark 524 in this embodiment is the abbreviated English letter "S” corresponding to south, and is formed in the area of the function mark plate 52 at the 11 o'clock direction.
  • the function mark plate 52 is formed as part of the dial 32, it is not limited to this and may be made of a plate material different from the dial 32. In this case, an opening for the function mark plate (not shown) is formed in the dial 32, and the function mark plate 52 is positioned between the dial 32 and the movement 7 in the vertical direction.
  • the operation unit 6 is operated by the user to realize a functional operation based on the operation for the movement 7.
  • the operation unit 6 switches the display mode D of the moon phase display unit 4 from either the northern hemisphere display mode DN or the southern hemisphere display mode DS in the control circuit 72 to the other, that is, performs a display mode switching operation.
  • the electronic watch 1 switches the display mode D by the user's operation of the operation unit 6, that is, the display mode switching operation, changes the rotation position of the moon phase plate 42 of the moon phase display unit 4, in this embodiment the step position, sets the subsequent moon phase plate rotation direction R to a post-switch moon phase plate rotation direction RC, which is the opposite direction from the current moon phase plate rotation direction RR, and performs a display mode switching operation in which the function hand 51 of the function display unit 5 points to the display mode marks 523, 524 corresponding to the switched display mode D.
  • the operation unit 6 has a crown 61, a push button 62, and a push button 63.
  • the crown 61 is formed to protrude from the side of the body 21, and can be pulled out one or more steps in the protruding direction by the user's operation, and can rotate around the axis.
  • the crown 61 can be rotated in a step other than the 0th step, for example, the 2nd step, which is not pulled out in the protruding direction, to forcibly rotate the hands 31 in the time display state, and the time display can be corrected.
  • the push buttons 62, 63 are formed to protrude from the side of the body 21, and can be pressed in the opposite direction to the protruding direction by the user's operation. The push buttons 62, 63 maintain their protruding state in the protruding direction when no external force is acting.
  • the operation unit 6 is connected to the control circuit 72 of the movement 7, and outputs the operation state by the user as an operation signal to the control circuit 72.
  • the movement 7 includes an antenna 71, a control circuit 72, an actuator 73, a gear train mechanism 74, a power generation mechanism 75, and a secondary battery 76, and performs the timekeeping function and other functional operations of the electronic watch 1.
  • the antenna 71 receives standard radio waves.
  • the electronic watch 1 is also a radio-controlled watch.
  • the antenna 71 is electrically connected to the control circuit 72, and the standard radio wave signal is output to the control circuit 72.
  • the antenna 71 may also receive a GPS (GLOBAL POSITIONING SYSTEM) signal output by a satellite.
  • GPS GLOBAL POSITIONING SYSTEM
  • the control circuit 72 controls the rotational position and direction of the hands 31, date plate 34, moon plate 42, and function hand 51.
  • the control circuit 72 is a circuit that controls the electronic watch 1, and based on a clock signal output from an oscillator (not shown), it measures the internal time of the electronic watch 1 and outputs control signals according to each function.
  • the control circuit 72 has a receiving IC 721 and a control IC 722 including a CPU (Central Processing Unit) and a memory unit such as a RAM (Random Access Memory) and a ROM (Read Only Memory).
  • the receiving IC 721 processes the standard radio wave received by the antenna 71, and outputs time information (including date information, hour information, minute information, and second information) based on the standard radio wave to the control IC 722.
  • the control IC 722 outputs a control signal to the actuator 73 to make the hands 31 display the time based on the internal time being measured.
  • the control IC 722 also corrects the internal time based on the time information output from the receiving IC 721.
  • the oscillator is a source of oscillation for generating a reference frequency for counting the displayed time of the electronic clock 1 and other functional operations, and may be, for example, a quartz crystal oscillator. Since the oscillation characteristics of a quartz crystal oscillator are prone to change depending on the external temperature, a temperature compensated quartz crystal oscillator (TCXO) may also be used.
  • the control circuit 72 also controls the moon phase board rotation direction R, which is the direction of rotation of the moon phase board 42, and the moon phase board rotation position, which is the rotation position of the moon phase board 42, using the third actuator 73c, which is an actuator for the moon phase board and will be described later, based on the current display mode DR, which is either the northern hemisphere display mode DN or the southern hemisphere display mode DS.
  • the northern hemisphere display mode DN is a mode that controls the moon phase display unit 4 to display the moon phase corresponding to the moon age for the northern hemisphere, and drives the moon phase board 42 to rotate in one of the moon phase board rotation directions R, which in this embodiment is the forward direction RY.
  • the southern hemisphere display mode DS is a mode that controls the moon phase display unit 4 to display the moon phase corresponding to the moon age for the southern hemisphere, and drives the moon phase board 42 to rotate in the other of the moon phase board rotation directions R, which in this embodiment is the reverse direction RN.
  • the lunar age for the northern hemisphere and the lunar age for the southern hemisphere at the same date, time and longitude are the same, but the lunar phase display corresponding to the lunar phase for the northern hemisphere and the lunar phase display corresponding to the lunar phase for the southern hemisphere are different.
  • the control circuit 72 rotates the lunar age board 42 in steps, so the lunar age board rotation position is the lunar age board step position S.
  • the lunar age board 42 rotates once by being driven to rotate in steps multiple times by the third actuator 73c.
  • the lunar age board 42 rotates once in 60 steps, and displays the lunar phase corresponding to the lunar age for two synodic cycles, so one synodic cycle is 30 steps.
  • the step position in the 12 o'clock direction of the lunar phase plate 42 is the current lunar phase plate step position SR
  • the control circuit 72 rotates the moon phase board 42 one step using the third actuator 73c, i.e., one step per day, with one step being the amount by which the moon phase board 42 moves per day.
  • the control circuit 72 rotates the moon phase board 42 two steps using the third actuator 73c once every 59 days, instead of one step per day.
  • the control circuit 72 determines whether a mode switching operation, which is a switching operation of the display mode D, has been performed by the operating unit 6. In this embodiment, the control circuit 72 determines whether a mode switching operation has been performed by determining whether the push button 63 has been pressed when the crown 61 is in the first stage position. When the crown 61 is in the first stage position, the control circuit 72 rotates the function hand 51 by the fourth actuator 73d to a position radially opposite the display mode marks 523, 524 corresponding to the current display mode DR.
  • the control circuit 72 drives the function hand 51 to rotate in a stepwise manner to a position radially opposite the northern hemisphere display mode mark 523, as shown in FIG. 5.
  • the control circuit 72 changes the current display mode DR to the switched display mode DC.
  • the post-switching display mode DC becomes the southern hemisphere display mode DS, so the control circuit 72 drives the function hand 51 to rotate in a stepwise manner to a position facing the southern hemisphere display mode mark 524 in the radial direction, as shown in FIG. 6.
  • the control circuit 72 drives the age board 42 to rotate in steps by the third actuator 73c from the reference age MB to a post-switching age board step position SC corresponding to a post-switching age board rotation position corresponding to a post-switching age MC that is away from the reference age MB on the opposite side to the current age MR by the reference age difference MD, where the reference age difference MD is the age difference of the current age MR based on the current age board step position SR corresponding to the current age board rotation position relative to the reference age MB.
  • the control circuit 72 sets the age board rotation direction R to a post-switching age board rotation direction RC that is opposite to the current age board rotation direction RR.
  • the reference age MB corresponds to the lunar phase display of the full moon, and is the center of one synodic cycle, i.e., half the number of lunar ages in one synodic cycle.
  • the reference age MB refers to the reference age corresponding to the synodic cycle at the current lunar age MR when the lunar phase display unit 4 displays the lunar phases corresponding to the lunar ages for two synodic cycle periods with one rotation of the lunar age board 42.
  • ), which is the age difference between the reference age MB and the current lunar age MR, becomes 9 (MD 9).
  • the post-switching lunar age MC can be calculated by MA-MR, where MA is the number of lunar ages in one synodic cycle.
  • the lunar age board 42 in this embodiment has the post-switching lunar age board step positions SC corresponding to the post-switching lunar age MC, the number of which is the number of synodic cycles, i.e., two. This is because the lunar age board 42 can display the lunar phases for two synodic cycles.
  • first post-switching lunar age board step position SC1 which is a post-switching lunar age board step position SC in the current lunar age board rotation direction RR with respect to the current lunar age board step position SR
  • second post-switching lunar age board step position SC2 which is a post-switching lunar age board step position SC in the post-switching lunar age board rotation direction RC with respect to the current lunar age board step position SR.
  • the first post-switching lunar age board step position SC1 can be calculated by SA1-SR, where SA1 is the number of steps of the lunar age board 42 that corresponds to the number of lunar ages in one synodic cycle.
  • the second post-switching lunar age board step position SC2 can be calculated by SA2-SR, where SA2 is the number of steps of the lunar age board 42 that corresponds to the number of lunar ages in two synodic cycles.
  • SA2 is the number of steps of the lunar age board 42 that corresponds to the number of lunar ages in two synodic cycles.
  • the current direction step difference SDR between the current lunar age board step position SR and the first post-switching lunar age board step position SC1 when rotated in the current lunar age board rotation direction RR is 18, and the post-switching direction step difference SDC between the current lunar age board step position SR and the second post-switching lunar age board step position SC2 when rotated in the post-switching lunar age board rotation direction RC is 12, so that the post-switching direction step difference SDC is less than the current direction step difference SDR in the step rotation drive of the lunar age board 42.
  • the control circuit 72 rotates the age board 42 in the current age board rotation direction RR in a step-rotating manner from the current age board step position SR corresponding to the current age board rotation position to the switched age board step position SC corresponding to the switched age board rotation position when the current direction step difference SDR, which is the rotation angle of the age board 42 when rotated in the current age board rotation direction RR from the current age board step position SR corresponding to the current age board rotation position to the switched age board step position SC corresponding to the switched age board rotation position, is less than a predetermined number of steps SDT corresponding to the predetermined rotation angle, and rotates the age board 42 in the current age board rotation direction RR in a step-rotating manner from the current age board step position SR to the switched age board step position SC when the current direction step difference SDR is equal to or greater than the predetermined number of steps SDT.
  • the predetermined number of steps SDT corresponding to the predetermined rotation angle is set based on at least one of the difference (
  • the difference
  • the predetermined number of steps SDT is set based on both the difference (
  • the power consumption of the electronic watch 1 is smaller when the number of steps is smaller.
  • the power consumption of the electronic watch 1 may be greater when the moon board 42 is rotated one step in the post-switch moon board rotation direction RC than when the moon board 42 is rotated one step in the current moon board rotation direction RR.
  • the predetermined number of steps SDT is set based on both the difference between the current direction step difference SDR and the post-switch step difference SDC (
  • the actuator 73 drives and rotates the hands 31, the date plate 34, the moon plate 42 and the function hand 51.
  • the actuator 73 includes a drive circuit and a drive section, and receives a control signal from the control circuit 72 to the drive circuit, which outputs a drive signal based on the input control signal to the drive section, which then drives the drive section based on the input drive signal.
  • the actuator 73 in this embodiment is a motor capable of step rotation drive such as a stepping motor or an electric motor, and is composed of a first actuator 73a that drives and rotates the second hand 31a, a second actuator 73b that drives and rotates the minute hand 31b and the hour hand 31c, a third actuator 73c that is an actuator for the moon plate and drives and rotates the moon plate 42, and a fourth actuator 73d that drives and rotates the function hand 51 and the date plate 34.
  • a motor capable of step rotation drive such as a stepping motor or an electric motor
  • the train wheel mechanism 74 transmits the driving force output by the actuator 73 to the hands 31, the date dial 34, the moon phase plate 42, and the function hand 51.
  • the train wheel mechanism 74 includes train wheel gears and the like, one end of which is connected to the actuator 73, and the other end of which is connected to the hands 31, the date dial 34, the moon phase plate 42, and the function hand 51.
  • the train wheel mechanism 74 is composed of a first train wheel mechanism 74a that connects the first actuator 73 to the second hand 31a, a second train wheel mechanism 74b that connects the second actuator 73b to the minute hand 31b and the hour hand 31c, a third train wheel mechanism 74c that connects the third actuator 73c to the moon phase plate 42, and a fourth train wheel mechanism 74d that connects the fourth actuator 73c to the function hand 51 and the date dial 34.
  • the power generation mechanism 75 generates electricity using external energy and supplies the generated electricity to electronic components such as the secondary battery 76 and the control circuit 72.
  • the power generation mechanism 75 can use a photoelectric conversion element that converts light energy, a thermoelectric conversion element that converts thermal energy, or a mechanoelectric conversion element that generates electricity from mechanical motion such as vibration energy.
  • the secondary battery 76 can store the power generated by the power generation mechanism 75 and is a power source that supplies power to the control circuit 72, the actuator 73, and other electronic components.
  • a lithium ion battery or an all-solid-state battery can be used as the secondary battery 76.
  • FIG. 9 is a flow diagram of the display mode switching operation of the electronic watch in this embodiment. Note that the display mode switching operation of the electronic watch 1 in this embodiment will be described including the step rotation drive operation of the moon phase board 42.
  • the control circuit 72 determines whether or not the crown 61 is in the first position (step ST1). Here, the control circuit 72 determines whether or not the user intends to operate the operating unit 6 to perform a display mode switching operation or to confirm display mode D.
  • control circuit 72 determines whether the crown 61 is not in the first position (step ST1: NO), it determines whether the day has been changed (step ST2).
  • the control circuit 72 determines whether or not to perform step rotation drive of the moon phase plate 42 by determining whether or not the day information has counted up by one count based on the internal time.
  • step ST2 determines whether the day has changed (step ST2: Yes)
  • step ST3 determines whether the count N of the moon phase board 42 is 58 or not.
  • the control circuit 72 determines whether the moon phase board 42 has rotated two steps before one revolution of 60 steps (60 days), that is, 58 steps. If the control circuit 72 determines that the day has not changed (step ST2: No), it ends this control cycle and moves to the next control cycle.
  • step ST3 determines that the count N of the moon age board 42 is not 58 (step ST3: No), it rotates the moon age board 42 one step (step ST4).
  • control circuit 72 increments the count N of the age board 42 by one count (step ST5), ends this control cycle, and moves to the next control cycle.
  • step ST3 determines that the count N of the moon age board 42 is 58 (step ST3: Yes), it rotates the moon age board 42 by two steps (step ST4).
  • control circuit 72 resets the count N of the moon phase board 42 to 0 (step ST6), ends this control cycle, and moves to the next control cycle. In other words, the control circuit 72 rotates the moon phase board 42 two steps once during one rotation.
  • control circuit 72 determines that the crown 61 is in the first position (step ST1: Yes), it drives the function hand 51 to rotate in steps based on the current display mode DR (step ST8).
  • control circuit 72 determines whether the push button 63 has been pressed (step ST9). Here, the control circuit 72 determines whether the user intends to switch the display mode.
  • step ST9 determines whether the current display mode DR is the Northern Hemisphere display mode DN (step ST10). If the control circuit 72 determines that the push button 63 has not been pressed (step ST9: No), it repeats the determination of whether the crown 61 is in the first position, i.e., step ST1.
  • control circuit 72 determines that the current display mode DR is the northern hemisphere display mode DN (step ST10: Yes), it changes the display mode D from the northern hemisphere display mode DN to the southern hemisphere display mode DS, and sets the post-switch display mode DC to the southern hemisphere display mode DS (step ST11).
  • control circuit 72 determines that the current display mode DR is not the northern hemisphere display mode DN (step ST10: No), it changes the display mode D from the southern hemisphere display mode DN to the northern hemisphere display mode DN, and sets the post-switch display mode DC to the northern hemisphere display mode DN (step ST12).
  • control circuit 72 acquires the current lunar age board step position SR (step ST13).
  • control circuit 72 calculates the post-switching lunar board step position SC based on the current lunar board step position SR (step ST14).
  • control circuit 72 calculates the first post-switching lunar board step position SC1 in the current lunar board rotation direction RR with respect to the current lunar board step position SR.
  • control circuit 72 calculates the current direction step difference SDR based on the current lunar age board step position SR and the first post-switch lunar age board step position SC1 (step ST15).
  • control circuit 72 determines whether the current direction step difference SDR is less than the predetermined number of steps SDT (step ST16).
  • the control circuit 72 determines whether driving the moon phase plate 42 to rotate in steps in either the current moon phase plate rotation direction RR or the switched moon phase plate rotation direction RC up to the switched moon phase plate step position SC will reduce power consumption of the electronic watch 1.
  • control circuit 72 determines that the current direction step difference SDR is less than the predetermined number of steps SDT (step ST16: Yes)
  • control circuit 72 determines that the current direction step difference SDR is equal to or greater than the predetermined number of steps SDT (step ST16: No)
  • it drives the moon age board 42 to rotate in a stepwise manner in the post-switching moon age board rotation direction RC to the post-switching moon age board step position SC, i.e., the second post-switching moon age board step position SC2 (step ST20).
  • control circuit 72 changes the moon phase board rotation direction R to the post-switch moon phase board rotation direction RC (step ST18).
  • control circuit 72 changes from the current display mode DR to the post-switch display mode DC.
  • the control circuit 72 drives the function hand 51 to rotate in steps based on the post-switching display mode DC (step ST19), ends this control cycle, and moves to the next control cycle.
  • the step rotation drive of the function hand 51 based on the post-switching display mode DC is performed after the moon phase plate rotation direction R is changed to the post-switching moon phase plate rotation direction RC (step ST18), but this is not limited to this, and may be performed from after it is determined that the push button 63 has been pressed (step ST9: Yes) until the current moon phase plate step position SR is obtained (step ST13), that is, immediately after switching to the display mode D.
  • the third actuator 73c drives the moon phase plate 42 to rotate in steps from the reference moon age MB to the post-switch moon phase plate step position SC corresponding to the post-switch moon phase plate rotation position corresponding to the post-switch moon age MC that is away from the reference moon age difference MD on the opposite side to the current moon age side.
  • the moon phase plate 42 rotates once in 60 steps
  • the control circuit 72 drives the moon phase plate 42 to rotate one step per day, and drives the moon phase plate 42 to rotate in two steps per day once every 59 days, so that the moon phase plate 42 completes two synodic cycles in 59 days, making one synodic cycle 29.5 days, which is closer to the actual lunar mean synodic cycle of 29.530589 compared to a synodic cycle of 30 days. Therefore, even if one synodic cycle on the moon phase plate 42 is 30 days, it is possible to approach the mean synodic cycle of 29.530589, and the error between the lunar phase display and the actual lunar phase of the moon can be reduced.
  • the control circuit 72 rotates the age board 42 in the current age board rotation direction RR if the current direction step difference SDR, which is the rotation angle of the age board 42 when rotated in the current age board rotation direction RR from the current age board step position SR to the post-switched age board step position SC corresponding to the post-switched age board rotation position, is less than a specified number of steps SDT corresponding to the specified rotation angle, and rotates the age board 42 in the post-switched age board rotation direction RC if the current direction step difference SDR is equal to or greater than the specified number of steps SDT, but is not limited to this.
  • the control circuit 72 may rotate the age board 42 in the forward direction RY when a forward direction step difference SDY, which is a rotation angle of the age board 42 when rotated in the forward direction RY from the current age board step position SR to a post-switching age board step position SC corresponding to the post-switching age board rotation position, is less than a predetermined number of steps SDT corresponding to a predetermined rotation angle, and may rotate the age board 42 in the reverse direction RN when the forward direction step difference SDY is equal to or greater than the predetermined number of steps SDT.
  • a forward direction step difference SDY which is a rotation angle of the age board 42 when rotated in the forward direction RY from the current age board step position SR to a post-switching age board step position SC corresponding to the post-switching age board rotation position
  • the predetermined number of steps SDT which is the predetermined rotation angle
  • the predetermined number of steps SDT may be set based on the difference between the forward direction step difference SDY, which is the forward direction rotation angle, and the forward direction step difference SDN, which is the rotation angle of the age board when the age board 42 is rotated in the reverse direction RN from the current age board step position SR to the post-switching age board step position SC, and the difference in power consumption due to the age board rotation direction R.
  • the power consumption of the electronic watch 1 is greater when rotating the moon phase plate 42 one step in the reverse direction RN than when rotating it one step in the forward direction RN.
  • the specified number of steps SDT is set based on both the difference between the forward direction step difference SDY and the reverse direction step difference SDN (
  • the predetermined number of steps SDT in this embodiment is a fixed value, but is not limited to this, and may be different based on the current display mode DR.
  • the predetermined number of steps SDT may be different in value when the current display mode DR is the northern hemisphere display mode DN than in value when the current display mode DR is the southern hemisphere display mode DN.
  • Fig. 10 is a diagram showing an example of an operation of the moon phase display unit during a display mode switching operation in a modified example, and is an example in which the current moon phase plate rotation position and the post-switch moon phase plate rotation position are displayed with the same moon mark.
  • Fig. 11 is a diagram showing an example of an operation of the moon phase display unit during a display mode switching operation in a modified example, and is an example in which the current moon phase plate rotation position and the post-switch moon phase plate rotation position are displayed with different moon marks.
  • the colors of the moon marks 421 and 422 may be different from each other so that the user can visually distinguish them.
  • the moon mark used to display the moon phase is the moon mark 421 used for the same lunar cycle, so no discomfort is felt by the user viewing the moon phase display unit 4.
  • the moon mark used to display the moon phase is changed from the moon mark 421 to the moon mark 422 used for a lunar cycle different from the lunar cycle before the switching operation, so discomfort is felt by the user viewing the moon phase display unit 4.
  • the control circuit 72 determines that a display mode switching operation has been performed using the operating unit 6, it rotates the lunar age board 42 from the current lunar age board rotation position SR to the post-switched lunar age board step position SC1, SC2, which is the post-switched lunar age board rotation position corresponding to the moon marks 421, 422 that display the lunar phases of the syzygy cycle at the current lunar age MR, out of the first post-switched lunar age board step position SC1 and the second post-switched lunar age board step position SC2, thereby preventing the user viewing the lunar phase display unit 4 from feeling uncomfortable.
  • the control circuit 72 drives the rotation in the forward direction RY from the current lunar age board step position SR to the switched lunar age board step position SC.
  • the control circuit 72 drives the rotation in the reverse direction RN from the current lunar age board step position SR to the switched lunar age board step position SC.
  • the control circuit 72 drives and rotates in the reverse direction RN from the current lunar age board step position SR to the switched lunar age board step position SC. Also, when the display mode is the southern hemisphere mode DS and the current lunar age MR based on the current lunar age board step position SR is greater than the reference lunar age MB (MR>MB), the control circuit 72 drives and rotates in the forward direction RY from the current lunar age board step position SR to the switched lunar age board step position SC.
  • the moon phase board 42 is driven to rotate one step per day, but this embodiment is not limited to this, and the moon phase board 42 may be driven to rotate n steps per day (n>1). In this case, if the moon phase board 42 rotates once in 60 steps by performing step rotation drive of one step per day, it will rotate once in 60 x n steps by performing step rotation drive of n steps per day.
  • one rotation of the moon phase plate 42 displays the moon phase corresponding to the moon age for two synodic cycles, but this is not limited to this, and one rotation of the moon phase plate 42 may display the moon phase corresponding to the moon age for one synodic cycle.
  • the moon phase plate step position SC after switching will be the number of synodic cycles, i.e., 1.
  • the control circuit 72 rotates the moon age board 42 one step per day, and once every 59 days, the control circuit 72 rotates the moon age board 42 in two steps per day, but this is not limited to this, and the moon age board 42 may be rotated in two steps per day once every two months based on the internal time.
  • the moon age board 42 rotates once in 60 steps, but this is not limited to this, and it is sufficient that the moon age board 42 rotates once in an even number of steps, for example, the moon age board 42 may rotate once in 58 steps.
  • the control circuit 72 determines that the count N of the moon age board 42 is 58, it rotates it one step, and does not set the count N of the moon age board 42 to 0, and when it is determined that the day is to be changed, it does not rotate it one step, and sets the count N of the moon age board 42 to 0.
  • the moon age board 42 may rotate once in an odd number of steps, for example, the moon age board 42 may rotate once in 59 steps.
  • the reference age MB will be set to 14.5.

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Abstract

A control circuit 72 of an electronic timepiece 1 uses a third actuator 72c to control a moon phase disk rotation direction R, which is the direction of rotation of a moon phase disk 42, and a moon phase disk rotation position (moon phase disk step position S), which is the position of rotation of the moon phase disk 42. Upon determining that an operation to switch between a northern hemisphere display mode DN and a southern hemisphere display mode DS has been performed through an operation unit, the control circuit 72 causes the moon phase disk 42 to be rotationally driven in steps from a current moon phase disk rotation position (current moon phase disk step position SR) to a post-switching moon phase disk rotation position (post-switching moon phase disk step position SC) that is spaced from a reference moon phase MB by a reference moon phase difference MD in a direction away from a current moon phase MR, where the reference moon phase difference MD is a moon phase difference of the current moon phase MR based on the current moon phase disk rotation position (current moon phase disk step position SR) with respect to the reference moon phase MB. This makes it possible to reduce computational load on the control circuit during a switching operation regarding a hemisphere display mode of a moon phase display unit.

Description

電子時計Electronic clock
　本発明は、電子時計に関する。 The present invention relates to an electronic watch.
　時計には、時刻表示部を有するとともに、月の満ち欠け、すなわち月相を表示する月相表示部を有し、ユーザーに対して現在日時における月齢に対応する月相表示を提供するものがある。月相表示部は、文字板に形成された月齢板用開口と、月（満月）が表示され、かつ回転駆動する月齢板とを有し、月齢板用開口に対して月齢板が一方向に相対回転することで、月齢に対応する月相表示を行う。 Some watches have a time display section and a moon phase display section that displays the phases of the moon, i.e., the lunar phase, providing the user with a moon phase display corresponding to the age of the moon at the current date and time. The moon phase display section has an opening for the moon phase plate formed in the dial, and a moon phase plate that displays the moon (full moon) and is driven to rotate, and the moon phase plate rotates in one direction relative to the opening for the moon phase plate to display the moon phase corresponding to the age of the moon.
　ここで、現在のユーザーがいる緯度によって月の満ち欠けの変化の様子が異なるため、対応する時計の月相表示も異ならせることとなる。具体的には、同一日時、同経度（所定の月齢）において、日時の経過に伴う月相表示の変化の方向が異なる。したがって、時計を所持するユーザーが北半球および南半球のいずれかに位置するのかで、月齢板用開口に対する月齢板の位置及び回転方向を異ならせることとなる。例えば、時計が北半球から南半球に移動した場合、月齢板の回転方向を北半球用回転方向から南半球用回転方向に変更し、月齢板を現在日時における北半球用月齢に対応する回転位置から南半球用月齢に対応する回転位置に回転させることとなる。従来の時計では、月齢板の回転方向をユーザーが手動で変更する時計が提供されている（特許文献１，２参照）。 Here, because the way the moon changes as it waxes and wanes varies depending on the latitude where the user is currently located, the corresponding watch's moon phase display will also differ. Specifically, for the same date, time, and longitude (predetermined lunar age), the direction of change in the lunar phase display over time will differ. Therefore, the position and rotation direction of the lunar phase plate relative to the lunar phase plate opening will differ depending on whether the user who owns the watch is located in the northern or southern hemisphere. For example, if the watch moves from the northern to southern hemisphere, the rotation direction of the lunar phase plate will be changed from the northern to southern hemisphere rotation direction, and the lunar phase plate will be rotated from the rotation position corresponding to the northern hemisphere lunar age at the current date and time to the rotation position corresponding to the southern hemisphere lunar age. Conventional watches are provided that allow the user to manually change the rotation direction of the lunar phase plate (see Patent Documents 1 and 2).
特開２０１８－１５５７４７号公報JP 2018-155747 A 特開２００９－２１６５４７号公報JP 2009-216547 A
　一方で、時計が北半球および南半球のうちいずれか一方から他方に移動した場合に、北半球用月相および南半球用月相のうちいずれか一方から他方の月相に対応する回転位置に月齢板を回転駆動させる方法としては、時計をユーザーが手動操作することで行うことが考えられる。しかしながら、ユーザーは、移動した半球における月相、すなわち移動後半球用月相を把握し、時計を手動操作し、月齢板を移動後半球用月相に対応する回転位置、すなわち移動後回転位置まで回転させることとなるため、ユーザーにとって煩わしく、自動で月齢板を移動後回転位置まで回転することが好ましいため、電子時計により自動で行うことが望まれる。電子時計は、月相表示部の北半球表示モードと南半球表示モードとを切り替える際に、制御回路が月齢板の回転方向を変更するとともに、移動後回転位置まで月齢板を回転駆動することとなる。電子時計においては、低消費電力での駆動が望まれているところ、特許文献１のように制御回路が現在日時に基づいて移動後半球用月齢を算出し、算出された移動後半球用月齢に対応した移動後回転位置まで月齢板を回転駆動させる場合、移動後半球月齢の算出が複雑であり、制御回路の演算負荷が高いため、表示モードの切り替えの度に高負荷な処理を行うと消費電力が大きくなるという問題がある。 On the other hand, when the watch moves from either the northern or southern hemisphere to the other, a method of rotating the moon phase from one of the northern or southern hemisphere lunar phases to a rotational position corresponding to the other lunar phase could be for the user to manually operate the watch. However, the user would have to grasp the lunar phase in the moved hemisphere, i.e., the post-movement lunar phase, and manually operate the watch to rotate the moon phase plate to a rotational position corresponding to the post-movement lunar phase, i.e., the post-movement rotational position, which is cumbersome for the user and it is preferable to rotate the moon phase plate to the post-movement rotational position automatically, so it is desirable for the electronic watch to do this automatically. When the electronic watch switches between the northern hemisphere display mode and the southern hemisphere display mode of the lunar phase display section, the control circuit changes the rotation direction of the moon phase plate and rotates the moon phase plate to the post-movement rotational position. In electronic watches, it is desirable to operate them with low power consumption, but when the control circuit calculates the post-movement hemispheric lunar age based on the current date and time as in Patent Document 1 and rotates the moon age plate to a post-movement rotation position corresponding to the calculated post-movement hemispheric lunar age, the calculation of the post-movement hemispheric lunar age is complicated and the calculation load of the control circuit is high, so there is a problem that power consumption increases when high-load processing is performed every time the display mode is switched.
　本発明は、上記に鑑みてなされたものであって、月相表示部の表示モードの切替動作における制御回路の演算負荷を抑制することができる電子時計を提案することを目的とする。 The present invention has been made in consideration of the above, and aims to propose an electronic watch that can reduce the computational load on the control circuit when switching the display mode of the moon phase display section.
　上述した課題を解決し、目的を達成するために、本実施形態における電子時計は、内部時刻に基づいて時刻表示を行う時刻表示部と、少なくとも回転自在に支持された月齢板を有し、前記月齢板が回転することで月齢に対応する月相表示を行う月相表示部と、前記月齢板を回転駆動する月齢板用アクチュエータと、前記月齢板用アクチュエータにより前記月齢板の回転方向である月齢板回転方向および前記月齢板の回転位置である月齢板回転位置を制御する制御回路と、少なくとも北半球における月相を表示する北半球表示モードおよび南半球における月相を表示する南半球表示モードのいずれか一方に月相表示部の表示モードを切り替える操作部と、を備え、前記制御回路は、前記操作部により前記表示モードの切り替え操作が行われたと判断すると、基準月齢に対する現在月齢板回転位置に基づいた現在月齢の月齢差を基準月齢差分とした場合に、基準月齢から現在月齢側と反対側に前記基準月齢差分離れた切替後月齢板回転位置まで、前記月齢板を前記月齢板用アクチュエータにより前記現在月齢板回転位置から回転駆動させ、前記月齢板回転方向を現在月齢板回転方向と反対方向である切替後月齢板回転方向とする、ことを特徴とする。 In order to solve the above-mentioned problems and achieve the object, the electronic timepiece in this embodiment includes a time display unit that displays the time based on an internal time, a moon phase display unit that has at least a moon phase plate supported so as to be freely rotatable and that displays the moon phase corresponding to the age of the moon as the moon phase plate rotates, a moon phase plate actuator that drives the moon phase plate to rotate, a control circuit that controls the moon phase plate rotation direction and the moon phase plate rotation position by the moon phase plate actuator, and a northern hemisphere display mode that displays the moon phase in at least the northern hemisphere and a southern hemisphere display mode that displays the moon phase in the southern hemisphere. and an operation unit that switches the display mode of the lunar phase display unit to one of the spherical display modes, and when the control circuit determines that the operation for switching the display mode has been performed by the operation unit, the control circuit rotates the lunar phase plate from the current lunar phase plate rotation position to a post-switched lunar phase plate rotation position that is away from the reference lunar phase by the reference lunar phase difference on the opposite side to the current lunar phase plate rotation direction, when the lunar phase difference of the current lunar phase plate based on the current lunar phase plate rotation position relative to the reference lunar phase is set as the reference lunar phase difference, by using the lunar phase plate actuator to rotate the lunar phase plate from the current lunar phase plate rotation position to a post-switched lunar phase plate rotation position that is away from the reference lunar phase by the reference lunar phase difference on the opposite side to the current lunar phase plate rotation direction, and is characterized in that the control circuit determines the lunar phase plate rotation direction as the post-switched lunar phase plate rotation direction that is opposite to the current lunar phase plate rotation direction.
　本発明における電子時計は、月相表示部の表示モードの切替動作における制御回路の演算負荷を抑制することができるという効果を奏する。 The electronic watch of the present invention has the advantage of being able to reduce the computational load on the control circuit when switching the display mode of the moon phase display section.
図１は、実施形態における電子時計の全体構成図である。FIG. 1 is a diagram showing the overall configuration of an electronic timepiece according to an embodiment of the present invention. 図２は、実施形態における電子時計の月相表示部の動作説明図（北半球表示モード）である。FIG. 2 is an explanatory diagram of the operation of the moon phase display unit of the electronic timepiece in this embodiment (northern hemisphere display mode). 図３は、実施形態における電子時計の月相表示部の動作説明図（南半球表示モード）である。FIG. 3 is an explanatory diagram of the operation of the moon phase display unit of the electronic timepiece in this embodiment (southern hemisphere display mode). 図４は、実施形態における電子時計のムーブメントのブロック図である。FIG. 4 is a block diagram of the movement of the electronic timepiece according to the embodiment. 図５は、表示モード切替動作時における機能表示部の動作説明図である。FIG. 5 is a diagram illustrating the operation of the function display section during the display mode switching operation. 図６は、表示モード切替動作時における機能表示部の動作説明図である。FIG. 6 is a diagram illustrating the operation of the function display section during the display mode switching operation. 図７は、表示モード切替動作時における月相表示部の動作説明の一例を示す図である。FIG. 7 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation. 図８は、表示モード切替動作時における月相表示部の動作説明の一例を示す図である。FIG. 8 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation. 図９は、実施形態における電子時計の表示モード切替動作のフロー図である。FIG. 9 is a flow diagram of the display mode switching operation of the electronic timepiece according to this embodiment. 図１０は、変形例における表示モード切替動作時における月相表示部の動作説明の一例を示す図である。FIG. 10 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation in the modified example. 図１１は、変形例における表示モード切替動作時における月相表示部の動作説明の一例を示す図である。FIG. 11 is a diagram illustrating an example of the operation of the moon phase display unit during the display mode switching operation in the modified example.
　以下、本発明につき図面を参照しつつ詳細に説明する。なお、下記の実施形態により本発明が限定されるものではない。また、下記の実施形態における構成要素には、当業者が容易に想定できるものあるいは実質的に同一のものが含まれる。 The present invention will be described in detail below with reference to the drawings. Note that the present invention is not limited to the following embodiments. Furthermore, the components in the following embodiments include those that a person skilled in the art would easily imagine or that are substantially the same.
　〔実施形態〕
　図１は、実施形態における電子時計の全体構成図である。図２は、実施形態における電子時計の月相表示部の動作説明図（北半球表示モード）である。図３は、実施形態における電子時計の月相表示部の動作説明図（南半球表示モード）である。図４は、実施形態における電子時計のムーブメントのブロック図である。図５は、表示モード切替動作時における機能表示部の動作説明図である。図６は、表示モード切替動作時における機能表示部の動作説明図である。図７は、表示モード切替動作時における月相表示部の動作説明の一例を示す図である。図８は、表示モード切替動作時における月相表示部の動作説明の一例を示す図である。また、図１～図３及び図５～図８（図１０、図１１を含む）におけるＸ方向は電子時計の１２時６時方向であり、Ｙ方向は電子時計の３時９時方向であり、Ｘ方向とＹ方向と直交する方向は電子時計の上下方向（厚さ方向）である。Ｏ１は、電子時計１の中心であり、指針の回転軸と一致する。また、Ｏ１を中心としたＸＹ平面における方向を径方向と呼ぶ。 [Embodiment]
FIG. 1 is an overall configuration diagram of an electronic watch in an embodiment. FIG. 2 is an explanatory diagram of the operation of the moon phase display unit of the electronic watch in an embodiment (northern hemisphere display mode). FIG. 3 is an explanatory diagram of the operation of the moon phase display unit of the electronic watch in an embodiment (southern hemisphere display mode). FIG. 4 is a block diagram of the movement of the electronic watch in an embodiment. FIG. 5 is an explanatory diagram of the operation of the function display unit during a display mode switching operation. FIG. 6 is an explanatory diagram of the operation of the function display unit during a display mode switching operation. FIG. 7 is a diagram showing an example of the operation of the moon phase display unit during a display mode switching operation. FIG. 8 is a diagram showing an example of the operation of the moon phase display unit during a display mode switching operation. In addition, the X direction in FIGS. 1 to 3 and FIGS. 5 to 8 (including FIGS. 10 and 11) is the 12 o'clock and 6 o'clock direction of the electronic watch, the Y direction is the 3 o'clock and 9 o'clock direction of the electronic watch, and the direction perpendicular to the X direction and the Y direction is the up-down direction (thickness direction) of the electronic watch. O1 is the center of the electronic watch 1 and coincides with the axis of rotation of the pointer. Moreover, a direction in the XY plane centered on O1 is called a radial direction.
　実施形態における電子時計１は、水晶発振器の出力に基づいて内部時刻を計時し、計時した時刻を指針３１で示す電子時計である。電子時計１は、計時以外にもアラーム機能やクロノグラフなどの機能を有する多機能型電子時計であってもよい。さらに、通信部により外部の端末機器と無線あるいは有線の少なくともいずれか一方により接続され、端末機器において設定された要求に基づいて、特定の機能（例えば、アラーム機能、端末機器の内部時刻情報に基づいた時刻補正機能、メール受信時などに報知する報知機能など）を実現する端末機器連動型時計であってもよい。 The electronic watch 1 in this embodiment is an electronic watch that keeps internal time based on the output of a crystal oscillator and indicates the kept time with hands 31. The electronic watch 1 may be a multi-function electronic watch that has functions other than timekeeping, such as an alarm function or a chronograph. Furthermore, it may be a terminal device-linked watch that is connected to an external terminal device via a communication unit, either wirelessly or wired, and realizes specific functions (e.g., an alarm function, a time correction function based on the internal time information of the terminal device, a notification function that notifies when email is received, etc.) based on requests set in the terminal device.
　電子時計１は、図１に示すように、外装ケース２と、時刻表示部３と、月相表示部４と、機能表示部５と、操作部６と、ムーブメント７とを備える。本実施形態における電子時計１は、時刻表示部３がアナログ表示式のアナログ電子腕時計であり、月相表示部４が月の満ち欠け、すなわち月相を表示するムーンフェイズウオッチである。電子時計１は、腕時計式として説明するが、ムーンフェイズウオッチとしての機能を有すれば他の時計式、例えば、懐中時計式であってもよい。 As shown in FIG. 1, electronic watch 1 comprises an exterior case 2, a time display unit 3, a moon phase display unit 4, a function display unit 5, an operation unit 6, and a movement 7. In this embodiment, electronic watch 1 has a time display unit 3 that is an analog electronic wristwatch with an analog display, and a moon phase display unit 4 that is a moon phase watch that displays the phases of the moon, i.e., the lunar phase. Although electronic watch 1 is described as being of the wristwatch type, it may be of another watch type, for example, a pocket watch type, so long as it has the functionality of a moon phase watch.
　外装ケース２は、電子時計１の最外郭を構成するものであり、胴２１とベゼル２２と風防２３と図示しない裏蓋とで構成される。胴２１は、開口を有し、開口内部の空間にあたる内部空間部Ｓ１に時刻表示部３、月相表示部４、機能表示部５およびムーブメント７が保持される。本実施形態においては、胴２１は円環状であり、開口は電子時計１の時計中心Ｏ１を中心とする円形形状である。開口の形状は、電子時計１の外装ケース２の外形形状や、デザインに合わせて任意の形状とすることができる。胴２１は、外周側面の１２時方向及び６時方向からそれぞれ突出して形成された先かん２４を備える。１２時側の先かん２４にはベルト８の一端が連結され、６時側の先かん２４にはベルト８の他端が連結される。 The exterior case 2 constitutes the outermost part of the electronic watch 1 and is composed of a body 21, a bezel 22, a crystal 23, and a back cover (not shown). The body 21 has an opening, and the time display section 3, moon phase display section 4, function display section 5, and movement 7 are held in the internal space S1, which corresponds to the space inside the opening. In this embodiment, the body 21 is annular, and the opening is circular with the center O1 of the electronic watch 1 as its center. The shape of the opening can be any shape to match the external shape of the exterior case 2 of the electronic watch 1 and the design. The body 21 has tip lugs 24 formed to protrude from the 12 o'clock and 6 o'clock directions on the outer peripheral side. One end of the belt 8 is connected to the tip lug 24 on the 12 o'clock side, and the other end of the belt 8 is connected to the tip lug 24 on the 6 o'clock side.
　胴２１の開口の一方の側である上方向開口を風防２３が覆い、他方の側である下方向開口を裏蓋が覆い、それぞれ固定することによって、内部空間部Ｓ１が閉塞空間となるため、時刻表示部３、月相表示部４、機能表示部５およびムーブメント７を保護することができる。風防２３や裏蓋を胴２１に固定するのに際して、それぞれゴムパッキンなどの図示しない防水部材を介することにより、保持力を高め、電子時計１の防塵性や防水性を高めることができる。胴２１は、例えば、樹脂材料や金属材料、セラミック材料などにより形成されている。ベゼル２２は、風防２３を胴２１に固定するものであり、環状に形成されて、胴２１のうち、内部空間部Ｓ１を構成する環状部に固定されている。ベゼル２２は、時刻表示部３の径方向外側に位置するものである。ベゼル２２は、例えば、樹脂材料や金属材料、セラミック材料などにより形成されている。なお、ベゼル２２は、胴２１に対して、電子時計１の時計中心Ｏ１を中心として回転自在に支持されていてもよい。風防２３は、ベゼル２２を介して、上方向側開口を覆う形状であり、上方向側から挿入しベゼル２２に固定し、ベゼル２２を介して胴２１に固定することで内部空間部Ｓ１を閉塞する。本実施形態では風防２３の平面視における外形形状は、円形状をしている。風防２３は、例えば、ガラスや透過性の樹脂材料などにより形成されている。裏蓋は、下方向開口部と略同形状の係合部を有し、下方向側から挿入し胴２１に固定することで内部空間部Ｓ１を閉塞する。本実施形態では裏蓋の外形形状は円形状である。裏蓋は、例えば、胴２１と同様に樹脂材料や金属材料、セラミック材料などにより形成されている。なお、ベゼル２２は、回転するものでなければ胴２１と一体に形成されていてもよい。 The windshield 23 covers the upper opening on one side of the opening of the body 21, and the back cover covers the lower opening on the other side. By fixing them together, the internal space S1 becomes a closed space, and the time display unit 3, the moon phase display unit 4, the function display unit 5, and the movement 7 can be protected. When fixing the windshield 23 and the back cover to the body 21, a waterproof member such as a rubber packing (not shown) can be used to increase the retention force and improve the dustproofness and waterproofness of the electronic watch 1. The body 21 is made of, for example, a resin material, a metal material, or a ceramic material. The bezel 22 fixes the windshield 23 to the body 21, is formed in an annular shape, and is fixed to the annular portion of the body 21 that constitutes the internal space S1. The bezel 22 is located radially outward from the time display unit 3. The bezel 22 is made of, for example, a resin material, a metal material, or a ceramic material. The bezel 22 may be supported on the case 21 so as to be rotatable about the watch center O1 of the electronic watch 1. The crystal 23 is shaped to cover the upper opening via the bezel 22, and is inserted from the upper side and fixed to the bezel 22, and is fixed to the case 21 via the bezel 22 to close the internal space S1. In this embodiment, the crystal 23 has a circular outer shape in a plan view. The crystal 23 is made of, for example, glass or a transparent resin material. The back cover has an engagement portion of approximately the same shape as the downward opening, and is inserted from the lower side and fixed to the case 21 to close the internal space S1. In this embodiment, the back cover has a circular outer shape. The back cover is made of, for example, a resin material, a metal material, or a ceramic material, like the case 21. The bezel 22 may be formed integrally with the case 21 as long as it does not rotate.
　時刻表示部３は、内部時刻に基づいて時刻表示を行う。時刻表示部３は、指針３１と、文字板３２と、見返しリング３３と、日板３４とを有する。本実施形態における時刻表示部３は、ムーブメント７の後述する制御回路７２によって計時された内部時刻（少なくとも日情報、時情報、分情報、秒情報）の表示、すなわち時刻表示を行う。 The time display unit 3 displays the time based on the internal time. The time display unit 3 has hands 31, a dial 32, a dial cover 33, and a date dial 34. In this embodiment, the time display unit 3 displays the internal time (at least date information, hour information, minute information, and second information) kept by the control circuit 72 of the movement 7 (described later), i.e., displays the time.
　指針３１は、電子時計１の時計中心Ｏ１を回転軸として回動自在にムーブメント７に支持され、ムーブメント７により回転駆動するものである。指針３１は棒状であり、金属材料や樹脂材料などにより形成される。本実施形態において、指針３１は、秒針３１ａ、分針３１ｂ、時針３１ｃであり、文字板３２よりも上方向側（風防２３側）に配置される。指針３１は、ユーザーによる操作部６の操作により回転するものでもある。指針３１は、指し示す位置に応じて内部時刻に基づいた時刻表示を行うことができる。 The hands 31 are supported by the movement 7 so as to be rotatable around the clock center O1 of the electronic clock 1 as the axis of rotation, and are driven to rotate by the movement 7. The hands 31 are rod-shaped and made of a metal material, a resin material, or the like. In this embodiment, the hands 31 are a second hand 31a, a minute hand 31b, and an hour hand 31c, and are positioned above the dial 32 (towards the crystal 23). The hands 31 also rotate when the user operates the operating unit 6. The hands 31 can display the time based on the internal time depending on the position they are pointing to.
　文字板３２は、指針３１とムーブメント７との間に配置され、ムーブメント７を保護するものである。文字板３２は、ユーザーに対して電子時計１の美観を与える機能を有する。文字板３２の表面上（風防２３と対向する側）には、時字３２１，３２２が設けられている。つまり、時字３２１，３２２は、上下方向において風防２３と対向するように配置され、風防２３を介してユーザーが視認することができる。ユーザーは、指針３１（秒針３１ａ、分針３１ｂおよび時針３１ｃ）と時字３２１，３２２との相対位置により、時刻表示に基づいた現在時刻を認識することができる。文字板３２は、風防２３を介して日板３４をユーザーに視認させる日板用開口３２３が形成されている。日板用開口３２３は、文字板３２の上下方向において日板３４と対向する位置に形成されており、文字板３２を上下に貫通するものである。本実施形態における日板用開口３２３は、矩形形状であり、文字板３２において「４時」の位置に形成されている。 The dial 32 is disposed between the hands 31 and the movement 7, and protects the movement 7. The dial 32 has the function of providing the user with an aesthetic look of the electronic timepiece 1. Hour characters 321, 322 are provided on the surface of the dial 32 (the side facing the crystal 23). In other words, the hour characters 321, 322 are disposed to face the crystal 23 in the vertical direction, and can be seen by the user through the crystal 23. The user can recognize the current time based on the time display from the relative positions of the hands 31 (second hand 31a, minute hand 31b, and hour hand 31c) and the hour characters 321, 322. The dial 32 is formed with a date plate opening 323 that allows the user to see the date plate 34 through the crystal 23. The date plate opening 323 is formed in a position facing the date plate 34 in the vertical direction of the dial 32, and penetrates the dial 32 from top to bottom. In this embodiment, the date plate opening 323 is rectangular and is formed at the "4 o'clock" position on the dial 32.
　見返しリング３３は、文字板３２の径方向外側に配置されている。見返しリング３３は、環状に形成され、かつ指針３１の先端よりも径方向外側に配置されている。なお、時刻表示部３は、時刻表示機能と異なる機能に応じた設定情報などの情報表示を行うことができる。情報表示としては、アラーム機能のＯＮ・ＯＦＦの設定や、アラームの設定時刻、クロノグラフ表示、タイムゾーン表示、受信動作に関する表示、サマータイムの設定表示などが挙げられる。この場合、文字板３２および見返しリング３３には、図示しない機能マークが設けられており、指針３１（秒針３１ａ、分針３１ｂ、時針３１ｃ）と機能マークとの相対位置により、情報表示に基づいた各機能の設定情報等を認識することができる。 The face ring 33 is positioned radially outward from the dial 32. The face ring 33 is formed in an annular shape and is positioned radially outward from the tip of the hand 31. The time display unit 3 can display information such as setting information corresponding to functions other than the time display function. Information displays include ON/OFF settings for the alarm function, the set time for the alarm, chronograph display, time zone display, display related to reception operation, and daylight saving time setting display. In this case, the dial 32 and face ring 33 are provided with function marks (not shown), and the setting information for each function based on the information display can be recognized based on the relative positions of the hands 31 (second hand 31a, minute hand 31b, hour hand 31c) and the function marks.
　日板３４は、回転することで、日表示を行うものである。日板３４は、上下方向から見た場合に円形状に形成されており、上下方向において文字板３２とムーブメント７との間に配置されている。日板３４は、時計中心Ｏ１を回転軸として、回動自在にムーブメント７に対して支持され、ムーブメント７により回転駆動するものである。日板３４は、日マーク３４１が複数形成されている。日マーク３４１は、日板用開口３２３および風防２３を介してユーザーに視認されることで内部時刻に基づいて現在日を日表示するものである。本実施形態における日マーク３４１としては、日に対応した数字の「１」～「３１」であり、日板３４のうち、周方向において１周の領域に時計回りに形成されている。 The date dial 34 rotates to display the date. When viewed from the top-bottom direction, the date dial 34 is formed in a circular shape, and is disposed between the dial 32 and the movement 7 in the top-bottom direction. The date dial 34 is supported by the movement 7 so as to be freely rotatable, with the watch center O1 as the axis of rotation, and is driven to rotate by the movement 7. The date dial 34 has multiple day marks 341 formed on it. The day marks 341 are visible to the user through the date dial opening 323 and the crystal 23, and display the current date based on the internal time. In this embodiment, the day marks 341 are the numbers "1" to "31" corresponding to the days, and are formed clockwise in an area of one revolution of the date dial 34 in the circumferential direction.
　月相表示部４は、図１～図３に示すように、月齢板４２が回転することで月齢に対応する月相表示を行うものである。月相表示部４は、月齢板用開口４１と、月齢板４２と、月齢板回転方向マーク４３，４４とを有する。 As shown in Figures 1 to 3, the lunar phase display unit 4 displays the lunar phase corresponding to the age of the moon by rotating the lunar phase plate 42. The lunar phase display unit 4 has an opening 41 for the lunar phase plate, the lunar phase plate 42, and lunar phase plate rotation direction marks 43, 44.
　月齢板用開口４１は、風防２３を介して月齢板４２をユーザーに視認させるものである。本実施形態における月齢板用開口４１は、文字板３２に形成されている。月齢板用開口４１は、上下方向において月齢板４２と対向し、文字板３２が月齢板４２と対向する領域のうち、１２時方向に略扇形状に形成されている。月齢板用開口４１は、月齢板回転方向Ｒにおいて両端部に凹部４１１，４１２が形成されている。凹部４１１，４１２は、月齢板４２の後述する月マーク４２１，４２２と上下方向において重なった場合に、月の満ち欠けを表示するものである。ここで、月齢板回転方向Ｒは、月齢板４２の月齢板中心Ｏ２周りの方向であり、現在月齢板回転方向ＲＲと、現在月齢板回転方向ＲＲと反対周りである切替後月齢板回転方向ＲＣとの２つ回転方向を有する。なお、図２及び図３においては、図示された月マーク４２１，４２２の動作を分かりやすくするために、月齢板用開口４１（凹部４１１，４１２を含む）が点線で図示されている。 The opening 41 for the moon phase plate allows the user to view the moon phase plate 42 through the windshield 23. In this embodiment, the opening 41 for the moon phase plate is formed in the dial 32. The opening 41 for the moon phase plate faces the moon phase plate 42 in the vertical direction, and is formed in an approximately fan-shaped shape at the 12 o'clock direction in the area where the dial 32 faces the moon phase plate 42. The opening 41 for the moon phase plate has recesses 411, 412 formed at both ends in the moon phase plate rotation direction R. The recesses 411, 412 indicate the phases of the moon when they overlap in the vertical direction with the moon marks 421, 422 on the moon phase plate 42, which will be described later. Here, the moon phase plate rotation direction R is a direction around the moon phase plate center O2 of the moon phase plate 42, and has two rotation directions: the current moon phase plate rotation direction RR and the switched moon phase plate rotation direction RC, which is opposite to the current moon phase plate rotation direction RR. In addition, in Figures 2 and 3, the opening 41 for the moon phase board (including the recesses 411 and 412) is shown with dotted lines to make it easier to understand the operation of the illustrated month marks 421 and 422.
　月齢板４２は、回転することで、月齢に対応する月相表示を行うものである。月齢板４２は、上下方向から見た場合に円形状に形成されており、上下方向において文字板３２とムーブメント７との間に配置されている。月齢板４２は、月齢板４２の月齢板中心Ｏ２を回転軸として、回動自在にムーブメント７に対して支持され、ムーブメント７により回転駆動するものである。ここで、月齢板４２は、時計回りの回転が正回転、反時計回りの回転が逆回転であり、時計回り方向が正転方向ＲＹ、反時計回り方向が逆転方向ＲＮである。月齢板４２は、上下方向における両面のうち、文字板３２と対向する対向面に２つの月マーク４２１，４２２が形成されている。月マーク４２１，４２２は、月齢板中心Ｏ２を挟んで対向、すなわち月齢板回転方向Ｒにおいて１８０度離れて形成されている。つまり、本実施形態における月相表示部４は、１回転で２朔望周期の朔望周期分の月齢に対応する月相表示を行うものである。本実施形態における月マーク４２１，４２２は、同一（形状、色などが同じ）のものであり、月マーク４２１，４２２をユーザーが視認しても区別をすることはできない。例えば、電子時計１が後述する北半球表示モードＤＮであると、月齢板４２の正転方向ＲＹが現在月齢板回転方向ＲＲとなる。月齢板４２は、現在月齢板回転方向ＲＲが正転方向ＲＹであると、図２に示すように、１回転することで、月マーク４２１に対応する第１朔望周期における新月（月齢＝０）の月相表示（同図左上の月齢板４２）、月マーク４２１に対応する第１朔望周期における満月（月齢＝１５）の月相表示（同図右上の月齢板４２）、月マーク４２２に対応する第２朔望周期における新月（月齢＝０）の月相表示（同図右下の月齢板４２。第１朔望周期における新月の月相表示である月マーク４２１の位置に対応する）、月マーク４２２に対応する第２朔望周期における満月（月齢＝１５）の月相表示（同図左下の月齢板４２）、月マーク４２１に対応する第１朔望周期における新月の月相表示（第２朔望周期における新月の月相表示である月マーク４２２の位置に対応する）を順に行う。一方、電子時計１が後述する南半球表示モードＤＳであると、月齢板４２の逆転方向ＲＮが現在月齢板回転方向ＲＲとなる。月齢板４２は、現在月齢板回転方向ＲＲが逆転方向ＲＮであると、図３に示すように、１回転することで、月マーク４２２に対応する第２朔望周期における新月（月齢＝０）の月相表示（同図左上の月齢板４２）、月マーク４２２に対応する第２朔望周期における満月（月齢＝１５）の月相表示（同図左下の月齢板４２）、月マーク４２１に対応する第１朔望周期における新月（月齢＝０）の月相表示（同図右下の月齢板４２、第２朔望周期における新月の月相表示である月マーク４２２の位置に対応する）、月マーク４２１に対応する第１朔望周期における満月（月齢＝１５）の月相表示（同図右上の月齢板４２）、月マーク４２２に対応する第２朔望周期における新月の月相表示（第１朔望周期における新月の月相表示である月マーク４２１の位置に対応する）を順に行う。 The moon phase plate 42 rotates to display the phase of the moon corresponding to the age of the moon. The moon phase plate 42 is formed in a circular shape when viewed from the top-bottom direction, and is arranged between the dial 32 and the movement 7 in the top-bottom direction. The moon phase plate 42 is supported by the movement 7 so as to be freely rotatable, with the moon phase plate center O2 of the moon phase plate 42 as the rotation axis, and is rotated by the movement 7. Here, clockwise rotation of the moon phase plate 42 is forward rotation, and counterclockwise rotation is reverse rotation, with the clockwise direction being the forward direction RY and the counterclockwise direction being the reverse direction RN. Of the two top-bottom sides of the moon phase plate 42, two moon marks 421, 422 are formed on the opposing surface facing the dial 32. The moon marks 421, 422 are formed opposite each other across the moon phase plate center O2, i.e., 180 degrees apart in the moon phase plate rotation direction R. In other words, the moon phase display unit 4 in this embodiment displays the moon phase corresponding to the moon age for two synodic cycles per rotation. The moon marks 421, 422 in this embodiment are identical (same shape, color, etc.), and the user cannot distinguish between the moon marks 421, 422 even if he or she visually recognizes them. For example, when the electronic timepiece 1 is in the northern hemisphere display mode DN described later, the forward rotation direction RY of the moon phase board 42 becomes the current moon phase board rotation direction RR. 2, when the lunar-age board rotation direction RR is the forward rotation direction RY, the lunar-age board 42 rotates once, in this order, to display the lunar phase of the new moon (lunar age = 0) in the first synodic cycle corresponding to the moon mark 421 (the lunar-age board 42 in the upper left of the figure), the lunar phase of the full moon (lunar age = 15) in the first synodic cycle corresponding to the moon mark 421 (the lunar-age board 42 in the upper right of the figure), the lunar phase of the new moon (lunar age = 0) in the second synodic cycle corresponding to the moon mark 422 (the lunar-age board 42 in the lower right of the figure, which corresponds to the position of the moon mark 421, which displays the lunar phase of the new moon in the first synodic cycle), the lunar phase of the full moon (lunar age = 15) in the second synodic cycle corresponding to the moon mark 422 (the lunar-age board 42 in the lower left of the figure), and the lunar phase of the new moon in the first synodic cycle corresponding to the moon mark 421 (corresponding to the position of the moon mark 422, which displays the lunar phase of the new moon in the second synodic cycle). On the other hand, when the electronic timepiece 1 is in the southern hemisphere display mode DS, which will be described later, the reverse direction RN of the moon phase plate 42 becomes the current moon phase plate rotation direction RR. When the current rotation direction RR of the lunar phase plate is the reverse direction RN, as shown in FIG. 3, the lunar phase plate 42 rotates once to sequentially display the lunar phase of the new moon (lunar age = 0) in the second lunar cycle corresponding to the moon mark 422 (the lunar phase plate 42 in the upper left of the figure), the lunar phase of the full moon (lunar age = 15) in the second lunar cycle corresponding to the moon mark 422 (the lunar phase plate 42 in the lower left of the figure), the lunar phase of the new moon (lunar age = 0) in the first lunar cycle corresponding to the moon mark 421 (the lunar phase plate 42 in the lower right of the figure, corresponding to the position of the moon mark 422 which displays the lunar phase of the new moon in the second lunar cycle), the lunar phase of the full moon (lunar age = 15) in the first lunar cycle corresponding to the moon mark 421 (the lunar phase plate 42 in the upper right of the figure), and the lunar phase of the new moon in the second lunar cycle corresponding to the moon mark 422 (corresponding to the position of the moon mark 421 which displays the lunar phase of the new moon in the first lunar cycle).
　月齢板回転方向マーク４３，４４は、各表示モードＤにおける月齢板回転方向Ｒを表示するものである。月齢板回転方向マーク４３，４４は、文字板３２の表面上に設けられている。月齢板回転方向マーク４３は、北半球表示モードＤＮに対応するものであり、時計回りの矢印図形および北に対応した省略英字の「Ｎ」とで構成されている。月齢板回転方向マーク４４は、南半球表示モードＤＳに対応するものであり、反時計回りの矢印図形および南に対応した省略英字の「Ｓ」とで構成されている。 The moon phase plate rotation direction marks 43, 44 indicate the moon phase plate rotation direction R in each display mode D. The moon phase plate rotation direction marks 43, 44 are provided on the surface of the dial 32. The moon phase plate rotation direction mark 43 corresponds to the northern hemisphere display mode DN, and is composed of a clockwise arrow and the abbreviated English letter "N" corresponding to north. The moon phase plate rotation direction mark 44 corresponds to the southern hemisphere display mode DS, and is composed of a counterclockwise arrow and the abbreviated English letter "S" corresponding to south.
　機能表示部５は、電子時計１の時刻表示機能と異なる機能に基づいた電子時計１の状態の表示、すなわち機能表示を行う。機能表示部５は、機能針５１と、機能マーク板５２とを有する。本実施形態における機能表示部５は、制御回路７２によって計時された内部時刻に基づいた現在曜日の表示、すなわち曜日表示、制御回路７２によって計測されている二次電池７６の残量の表示、すなわち残量表示、制御回路７２に記憶されている北半球表示モードＤＮおよび南半球表示モードＤＳのいずれか一方である月相表示部４の表示モードＤの表示、すなわち表示モード表示を行う。 The function display unit 5 displays the state of the electronic watch 1 based on a function different from the time display function of the electronic watch 1, i.e., displays the function. The function display unit 5 has a function hand 51 and a function mark plate 52. In this embodiment, the function display unit 5 displays the current day of the week based on the internal time kept by the control circuit 72, i.e., displays the day of the week, displays the remaining charge of the secondary battery 76 measured by the control circuit 72, i.e., displays the remaining charge, and displays the display mode D of the moon phase display unit 4, which is either the northern hemisphere display mode DN or the southern hemisphere display mode DS stored in the control circuit 72, i.e., displays the display mode.
　機能針５１は、機能マーク板５２の機能マーク中心Ｏ３を回転軸として回動自在にムーブメント７に支持され、ムーブメント７により回転駆動するものである。機能針５１は棒状であり、金属材料や樹脂材料などにより形成される。本実施形態において、機能針５１は、機能マーク板５２よりも上方向側（風防２３側）に配置される。機能針５１は、ユーザーによる操作部６の操作により回転、すなわち上記機能表示のうちいずれかを指示するものである。機能針５１は、指し示す位置に応じて、各機能に対応する基づいた機能表示を行うことができる。 The function hand 51 is supported by the movement 7 so as to be rotatable around the center O3 of the function mark plate 52 as the axis of rotation, and is driven to rotate by the movement 7. The function hand 51 is rod-shaped and made of a metal or resin material. In this embodiment, the function hand 51 is positioned above the function mark plate 52 (towards the windshield 23). The function hand 51 rotates when the user operates the operating unit 6, that is, it indicates one of the above function displays. The function hand 51 can display a function corresponding to each function depending on the position it is pointing to.
　機能マーク板５２は、機能針５１とムーブメント７との間に配置されている。本実施形態における機能マーク板５２は、文字板３２の一部として形成されている。機能マーク板５２の表面上（風防２３と対向する側）には、曜日マーク、残量マーク５２２、北半球表示モードマーク５２３および南半球表示モードマーク５２４が設けられている。つまり、機能マーク５２１～５２４は、上下方向において風防２３と対向するように配置され、風防２３を介してユーザーが視認することができる。ユーザーは、機能針５１と機能マーク５２１～５２４との相対位置により、機能表示に基づいた電子時計１の状態を認識することができる。曜日マーク５２１は、機能針５１の位置に基づいて現在曜日を曜日表示するものである。本実施形態における曜日マーク５２１としては、各曜日（日曜日から土曜日まで）にそれぞれ対応した省略英字の「Ｓ」、「Ｍ」、「Ｔ」、「Ｗ」、「Ｔ」、「Ｆ」、「Ｓ」であり、機能マーク板５２のうち、２時方向から５時方向までの領域に時計回りに形成されている。残量マーク５２２としては、機能針５１の位置に基づいて二次電池７６の残量を残量表示するものである。本実施形態における残量マーク５２２としては、残量に対応した図形の第１残量図形、第１残量図形よりも径方向において幅が狭い第２残量図形、第２残量図形よりも径方向において幅が狭い第３残量図形、第３残量図形よりも径方向において幅が狭い第４残量図形であり、機能マーク板５２のうち、１０時方向から６時方向までの領域に反時計回りに形成されている。表示モードマーク５２３，５２４は、表示モードＤに対応するものであり、機能針５１の位置に基づいて現在表示モードＤＲを表示モード表示するものである。本実施形態における北半球表示モードマーク５２３としては、北に対応した省略英字の「Ｎ」であり、機能マーク板５２のうち、１時方向の領域に形成されている。本実施形態における南半球表示モードマーク５２４としては、南に対応した省略英字の「Ｓ」であり、機能マーク板５２のうち、１１時方向の領域に形成されている。なお、機能マーク板５２は、文字板３２の一部として形成されているが、これに限定されるものではなく、文字板３２と異なる板材に構成されていてもよい。この場合、文字板３２に図示しない機能マーク板用開口を形成し、機能マーク板５２を上下方向において、上下方向において文字板３２とムーブメント７との間に配置することとなる。 The function mark plate 52 is disposed between the function hand 51 and the movement 7. In this embodiment, the function mark plate 52 is formed as a part of the dial 32. On the surface of the function mark plate 52 (the side facing the crystal 23), a day of the week mark, a remaining amount mark 522, a northern hemisphere display mode mark 523, and a southern hemisphere display mode mark 524 are provided. In other words, the function marks 521 to 524 are disposed so as to face the crystal 23 in the vertical direction, and can be seen by the user through the crystal 23. The user can recognize the state of the electronic watch 1 based on the function display from the relative positions of the function hand 51 and the function marks 521 to 524. The day of the week mark 521 displays the current day of the week based on the position of the function hand 51. The day of the week marks 521 in this embodiment are the abbreviated English letters "S", "M", "T", "W", "T", "F", and "S" corresponding to each day of the week (Sunday to Saturday), and are formed clockwise in the area of the function mark plate 52 from the 2 o'clock direction to the 5 o'clock direction. The remaining amount mark 522 indicates the remaining amount of the secondary battery 76 based on the position of the function hand 51. The remaining amount mark 522 in this embodiment is a first remaining amount figure corresponding to the remaining amount, a second remaining amount figure narrower in the radial direction than the first remaining amount figure, a third remaining amount figure narrower in the radial direction than the second remaining amount figure, and a fourth remaining amount figure narrower in the radial direction than the third remaining amount figure, and are formed in a counterclockwise direction in the area from the 10 o'clock direction to the 6 o'clock direction on the function mark plate 52. The display mode marks 523 and 524 correspond to the display mode D, and indicate the current display mode DR based on the position of the function hand 51. The northern hemisphere display mode mark 523 in this embodiment is the abbreviated English letter "N" corresponding to north, and is formed in the area of the function mark plate 52 at the 1 o'clock direction. The southern hemisphere display mode mark 524 in this embodiment is the abbreviated English letter "S" corresponding to south, and is formed in the area of the function mark plate 52 at the 11 o'clock direction. Although the function mark plate 52 is formed as part of the dial 32, it is not limited to this and may be made of a plate material different from the dial 32. In this case, an opening for the function mark plate (not shown) is formed in the dial 32, and the function mark plate 52 is positioned between the dial 32 and the movement 7 in the vertical direction.
　操作部６は、ユーザーが操作することで、ムーブメント７に対して、操作に基づいた機能動作を実現するものである。本実施形態における操作部６は、制御回路７２における北半球表示モードＤＮおよび南半球表示モードＤＳのいずれか一方から他方に月相表示部４の表示モードＤを切り替える操作である、すなわち表示モード切替操作を行うものである。具体的には、電子時計１は、ユーザーによる操作部６の操作、すなわち表示モード切替操作により、表示モードＤを切替え、月相表示部４の月齢板４２の回転位置、本実施形態ではステップ位置を変更し、以後の月齢板回転方向Ｒを現在月齢板回転方向ＲＲから反対方向である切替後月齢板回転方向ＲＣとし、機能表示部５の機能針５１が切り替えられた表示モードＤに対応する表示モードマーク５２３，５２４を指し示す表示モード切替動作が行われる。操作部６は、リューズ６１と、プッシュボタン６２と、プッシュボタン６３とを有する。リューズ６１は、胴２１の側面から突出して形成されており、ユーザーの操作により、突出方向に１段又は複数段引き出すことができ、軸心周りに回転することができる。リューズ６１は、突出方向に引き出されていない０段とは異なる段、例えば２段にした状態で、回転することで、時刻表示状態の指針３１を強制的に回転させることができ、時刻表示を補正することができる。プッシュボタン６２，６３は、胴２１の側面から突出して形成されており、ユーザーの操作により突出方向と反対方向に押圧することができる。プッシュボタン６２，６３は、外力が作用していない状態では、突出方向に突出した状態を維持する。プッシュボタン６２，６３は、例えば、いずれか一方または両方を押圧することで、機能表示部５における曜日表示または残量表示を切り替えることができる。操作部６は、ムーブメント７の制御回路７２と接続されており、ユーザーによる操作状態を操作信号として、制御回路７２に出力する。 The operation unit 6 is operated by the user to realize a functional operation based on the operation for the movement 7. In this embodiment, the operation unit 6 switches the display mode D of the moon phase display unit 4 from either the northern hemisphere display mode DN or the southern hemisphere display mode DS in the control circuit 72 to the other, that is, performs a display mode switching operation. Specifically, the electronic watch 1 switches the display mode D by the user's operation of the operation unit 6, that is, the display mode switching operation, changes the rotation position of the moon phase plate 42 of the moon phase display unit 4, in this embodiment the step position, sets the subsequent moon phase plate rotation direction R to a post-switch moon phase plate rotation direction RC, which is the opposite direction from the current moon phase plate rotation direction RR, and performs a display mode switching operation in which the function hand 51 of the function display unit 5 points to the display mode marks 523, 524 corresponding to the switched display mode D. The operation unit 6 has a crown 61, a push button 62, and a push button 63. The crown 61 is formed to protrude from the side of the body 21, and can be pulled out one or more steps in the protruding direction by the user's operation, and can rotate around the axis. The crown 61 can be rotated in a step other than the 0th step, for example, the 2nd step, which is not pulled out in the protruding direction, to forcibly rotate the hands 31 in the time display state, and the time display can be corrected. The push buttons 62, 63 are formed to protrude from the side of the body 21, and can be pressed in the opposite direction to the protruding direction by the user's operation. The push buttons 62, 63 maintain their protruding state in the protruding direction when no external force is acting. For example, by pressing either one or both of the push buttons 62, 63, the day display or the remaining amount display in the function display unit 5 can be switched. The operation unit 6 is connected to the control circuit 72 of the movement 7, and outputs the operation state by the user as an operation signal to the control circuit 72.
　ムーブメント７は、図３に示すように、アンテナ７１、制御回路７２、アクチュエータ７３、輪列機構７４、発電機構７５、二次電池７６などを備え、電子時計１の計時機能やその他の機能動作などを行う。 As shown in FIG. 3, the movement 7 includes an antenna 71, a control circuit 72, an actuator 73, a gear train mechanism 74, a power generation mechanism 75, and a secondary battery 76, and performs the timekeeping function and other functional operations of the electronic watch 1.
　アンテナ７１は、標準電波を受信するものである。つまり、電子時計１は、電波時計でもある。アンテナ７１は、制御回路７２と電気的に接続されており、標準電波の信号が制御回路７２に出力される。なお、アンテナ７１は衛星が出力するＧＰＳ（ＧＬＯＢＡＬ　ＰＯＳＩＴＩＯＮＩＮＧ　ＳＹＳＴＥＭ）信号を受信するものであってもよい。 The antenna 71 receives standard radio waves. In other words, the electronic watch 1 is also a radio-controlled watch. The antenna 71 is electrically connected to the control circuit 72, and the standard radio wave signal is output to the control circuit 72. The antenna 71 may also receive a GPS (GLOBAL POSITIONING SYSTEM) signal output by a satellite.
　制御回路７２は、指針３１、日板３４、月齢板４２および機能針５１の回転位置、回転方向を制御するものである。制御回路７２は、電子時計１の制御を行う回路であり、図示しない発振器から出力されたクロック信号に基づき、電子時計１の内部時刻を計時したり、各機能に応じた制御信号を出力する。制御回路７２は、受信ＩＣ７２１と、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）及びＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）やＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）といった記憶部を含む制御ＩＣ７２２とを有する。受信ＩＣ７２１は、アンテナ７１により受信された標準電波を信号処理するものであり、制御ＩＣ７２２に標準電波に基づいた時刻情報（日情報、時情報、分情報、秒情報を含む）を出力する。制御ＩＣ７２２は、計時している内部時刻に基づいて、指針３１に時刻表示を行わせるための制御信号をアクチュエータ７３に出力する。制御ＩＣ７２２は、受信ＩＣ７２１から出力された時刻情報に基づいて内部時刻を補正するものでもある。なお、発振器は、電子時計１の表示時刻の計時やその他の機能動作に関する基準周波数を生成するための源振であり、例えば水晶振動子を用いることができる。水晶振動子は外部温度により発振特性が変動しやすいため、温度補償型水晶振動器（ＴＣＸＯ）を用いてもよい。 The control circuit 72 controls the rotational position and direction of the hands 31, date plate 34, moon plate 42, and function hand 51. The control circuit 72 is a circuit that controls the electronic watch 1, and based on a clock signal output from an oscillator (not shown), it measures the internal time of the electronic watch 1 and outputs control signals according to each function. The control circuit 72 has a receiving IC 721 and a control IC 722 including a CPU (Central Processing Unit) and a memory unit such as a RAM (Random Access Memory) and a ROM (Read Only Memory). The receiving IC 721 processes the standard radio wave received by the antenna 71, and outputs time information (including date information, hour information, minute information, and second information) based on the standard radio wave to the control IC 722. The control IC 722 outputs a control signal to the actuator 73 to make the hands 31 display the time based on the internal time being measured. The control IC 722 also corrects the internal time based on the time information output from the receiving IC 721. The oscillator is a source of oscillation for generating a reference frequency for counting the displayed time of the electronic clock 1 and other functional operations, and may be, for example, a quartz crystal oscillator. Since the oscillation characteristics of a quartz crystal oscillator are prone to change depending on the external temperature, a temperature compensated quartz crystal oscillator (TCXO) may also be used.
　制御回路７２は、北半球表示モードＤＮおよび南半球表示モードＤＳのうちいずれか一方である現在表示モードＤＲに基づいて、月齢板用アクチュエータである後述する第３アクチュエータ７３ｃにより月齢板４２の回転方向である月齢板回転方向Ｒおよび月齢板４２の回転位置である月齢板回転位置を制御するものでもある。ここで、北半球表示モードＤＮは、月相表示部４を北半球用月齢に対応する月相表示となるように制御するモードであり、月齢板４２を月齢板回転方向Ｒのうち一方、本実施形態では正転方向ＲＹに回転駆動させるものである。南半球表示モードＤＳは、月相表示部４を南半球用月齢に対応する月相表示となるように制御するモードであり、月齢板４２を月齢板回転方向Ｒのうち他方、本実施形態では逆転方向ＲＮに回転駆動させるものである。なお、同一日時、同経度における北半球用月齢および南半球用月齢は、同一月齢となる一方、北半球用月相に対応する月相表示および南半球用月相に対応する月相表示が異なる。本実施形態における制御回路７２は、月齢板４２を回転駆動させる際に、ステップ回転駆動させるものであるので、月齢板回転位置は月齢板ステップ位置Ｓである。つまり、月齢板４２は、第３アクチュエータ７３ｃにより、複数回ステップ回転駆動することで１回転することとなる。本実施形態における月齢板４２は、６０ステップで１回転するものであり、２朔望周期の朔望周期分の月齢に対応する月相表示を行うものであるので、１朔望周期は３０ステップとなる。例えば、月齢板４２は、図２および図３に示すように、１２時の方向におけるステップ位置を現在月齢板ステップ位置ＳＲとし、月マーク４２１に対応する第１朔望周期における新月（月齢Ｍ＝０）の月相表示における現在月齢板ステップ位置ＳＲを０（ＳＲ＝０）とすると、月マーク４２１に対応する第１朔望周期における満月（Ｍ＝１５）の月相表示における現在月齢板ステップ位置Ｓを１５（ＳＲ＝１５）とし、月マーク４２２に対応する第２朔望周期における新月（Ｍ＝０）の月相表示における現在月齢板ステップ位置ＳＲを３０（ＳＲ＝３０）とし、月マーク４２２に対応する第２朔望周期における満月（Ｍ＝１５）の月相表示における現在月齢板ステップ位置ＳＲを４５（ＳＲ＝４５）とする。 The control circuit 72 also controls the moon phase board rotation direction R, which is the direction of rotation of the moon phase board 42, and the moon phase board rotation position, which is the rotation position of the moon phase board 42, using the third actuator 73c, which is an actuator for the moon phase board and will be described later, based on the current display mode DR, which is either the northern hemisphere display mode DN or the southern hemisphere display mode DS. Here, the northern hemisphere display mode DN is a mode that controls the moon phase display unit 4 to display the moon phase corresponding to the moon age for the northern hemisphere, and drives the moon phase board 42 to rotate in one of the moon phase board rotation directions R, which in this embodiment is the forward direction RY. The southern hemisphere display mode DS is a mode that controls the moon phase display unit 4 to display the moon phase corresponding to the moon age for the southern hemisphere, and drives the moon phase board 42 to rotate in the other of the moon phase board rotation directions R, which in this embodiment is the reverse direction RN. The lunar age for the northern hemisphere and the lunar age for the southern hemisphere at the same date, time and longitude are the same, but the lunar phase display corresponding to the lunar phase for the northern hemisphere and the lunar phase display corresponding to the lunar phase for the southern hemisphere are different. In this embodiment, the control circuit 72 rotates the lunar age board 42 in steps, so the lunar age board rotation position is the lunar age board step position S. In other words, the lunar age board 42 rotates once by being driven to rotate in steps multiple times by the third actuator 73c. In this embodiment, the lunar age board 42 rotates once in 60 steps, and displays the lunar phase corresponding to the lunar age for two synodic cycles, so one synodic cycle is 30 steps. For example, as shown in FIG. 2 and FIG. 3, the step position in the 12 o'clock direction of the lunar phase plate 42 is the current lunar phase plate step position SR, and the current lunar phase plate step position SR in the lunar phase display of the new moon (lunar age M=0) in the first lunar cycle corresponding to the moon mark 421 is 0 (SR=0). The current lunar phase plate step position S in the lunar phase display of the full moon (M=15) in the first lunar cycle corresponding to the moon mark 421 is 15 (SR=15). The current lunar phase plate step position SR in the lunar phase display of the new moon (M=0) in the second lunar cycle corresponding to the moon mark 422 is 30 (SR=30). The current lunar phase plate step position SR in the lunar phase display of the full moon (M=15) in the second lunar cycle corresponding to the moon mark 422 is 45 (SR=45).
　制御回路７２は、内部時刻に基づいて日が変更されると、月齢板４２を第３アクチュエータ７３ｃにより１ステップ分回転駆動させる、すなわち１日１ステップ回転駆動させるものであり、１ステップが１日あたりに、月齢板４２が動作する量である。また、制御回路７２は、５９日に１回、月齢板４２を１日１ステップ分ではなく、２ステップ分第３アクチュエータ７３ｃによりステップ回転駆動させるものである。 When the day is changed based on the internal time, the control circuit 72 rotates the moon phase board 42 one step using the third actuator 73c, i.e., one step per day, with one step being the amount by which the moon phase board 42 moves per day. In addition, the control circuit 72 rotates the moon phase board 42 two steps using the third actuator 73c once every 59 days, instead of one step per day.
　制御回路７２は、操作部６により表示モードＤの切り替え操作であるモード切替操作が行われたか否かを判断するものである。本実施形態における制御回路７２は、リューズ６１が１段の位置にある状態で、プッシュボタン６３が押圧されたか否かを判断することで、モード切替操作が行われたか否かを判断する。制御回路７２は、リューズ６１が１段の位置であると、現在表示モードＤＲに対応する表示モードマーク５２３，５２４と径方向において対向する位置まで機能針５１を第４アクチュエータ７３ｄにより回転駆動する。例えば、制御回路７２は、現在表示モードＤＲが北半球表示モードＤＮであると、図５に示すように、径方向において北半球表示モードマーク５２３と対向する位置まで機能針５１をステップ回転駆動する。制御回路７２は、モード切替操作が行われると、現在表示モードＤＲから切替後表示モードＤＣを変更する。例えば、制御回路７２は、現在表示モードＤＲが北半球表示モードＤＮの状態で、モード切替操作が行われると、切替後表示モードＤＣが南半球表示モードＤＳとなるので、図６に示すように、径方向において南半球表示モードマーク５２４と対向する位置まで機能針５１をステップ回転駆動する。 The control circuit 72 determines whether a mode switching operation, which is a switching operation of the display mode D, has been performed by the operating unit 6. In this embodiment, the control circuit 72 determines whether a mode switching operation has been performed by determining whether the push button 63 has been pressed when the crown 61 is in the first stage position. When the crown 61 is in the first stage position, the control circuit 72 rotates the function hand 51 by the fourth actuator 73d to a position radially opposite the display mode marks 523, 524 corresponding to the current display mode DR. For example, when the current display mode DR is the northern hemisphere display mode DN, the control circuit 72 drives the function hand 51 to rotate in a stepwise manner to a position radially opposite the northern hemisphere display mode mark 523, as shown in FIG. 5. When a mode switching operation is performed, the control circuit 72 changes the current display mode DR to the switched display mode DC. For example, when the current display mode DR is the northern hemisphere display mode DN and a mode switching operation is performed, the post-switching display mode DC becomes the southern hemisphere display mode DS, so the control circuit 72 drives the function hand 51 to rotate in a stepwise manner to a position facing the southern hemisphere display mode mark 524 in the radial direction, as shown in FIG. 6.
　制御回路７２は、モード切替操作が行われると、基準月齢ＭＢに対する現在月齢板回転位置に対応する現在月齢板ステップ位置ＳＲに基づいた現在月齢ＭＲの月齢差を基準月齢差分ＭＤとした場合に、基準月齢ＭＢから現在月齢ＭＲ側と反対側に基準月齢差分ＭＤ離れた切替後月齢ＭＣに対応する切替後月齢板回転位置に対応する切替後月齢板ステップ位置ＳＣまで、月齢板４２を第３アクチュエータ７３ｃによりステップ回転駆動させるものである。また、制御回路７２は、モード切替操作が行われると、月齢板回転方向Ｒを現在月齢板回転方向ＲＲと反対方向である切替後月齢板回転方向ＲＣとする。ここで、基準月齢ＭＢは、満月の月相表示に対応するものであり、１朔望周期の中央、すなわち１朔望周期の月齢数の半分である。また、基準月齢ＭＢは、月相表示部４が月齢板４２の１回転で２朔望周期期分の月齢に対応する月相表示を行う場合、現在月齢ＭＲにおける朔望周期に対応する基準月齢をいう。本実施形態における１朔望周期の全月齢数は、月齢＝０～月齢＝２９の３０であるので、基準月齢ＭＢは１５に設定されている。例えば、図７に示すように、月齢板４２の現在月齢板ステップ位置ＳＲが６（ＳＲ＝６）であり、対応する現在月齢ＭＲが６（ＭＲ＝６）である際に、モード切替操作が行われると、基準月齢ＭＢに対する現在月齢ＭＲの月齢差である基準月齢差分ＭＤＢ（＝｜ＭＢ－ＭＲ｜）が９（ＭＤ＝９）となる。この場合、基準月齢ＭＢから現在月齢ＭＲ側（同図では点線の月表示よりも左側）と反対側（同図では右側）に基準月齢差分ＭＤＢである９月齢分離れた切替後月齢ＭＣが２４（ＭＣ＝２４）となる。なお、切替後月齢ＭＣは、１朔望周期の月齢数をＭＡとすると、ＭＡ－ＭＲで求めることができる。ここで、本実施形態における月齢板４２は、切替後月齢ＭＣに対応する切替後月齢板ステップ位置ＳＣが朔望周期の数分、すなわち２つある。これは、月齢板４２が２朔望周期の朔望周期分の月相表示が可能なためである。具体的には、図７に示すように、現在月齢板ステップ位置ＳＲに対して、現在月齢板回転方向ＲＲにおける切替後月齢板ステップ位置ＳＣである第１切替後月齢板ステップ位置ＳＣ１と、図８に示すように、現在月齢板ステップ位置ＳＲに対して、切替後月齢板回転方向ＲＣにおける切替後月齢板ステップ位置ＳＣである第２切替後月齢板ステップ位置ＳＣ２とである。例えば、現在月齢板ステップ位置ＳＲ（＝６、月マーク４２１による月相表示を行う）に対応する現在月齢ＭＲ（＝６）に対して切替後月齢ＭＣ（＝２４）に対応する切替後月齢板ステップ位置ＳＣは、図７に示すように、第１切替後月齢板ステップ位置ＳＣ１（＝２４、月マーク４２１による月相表示を行う）と、図８に示すように、第２切替後月齢板ステップ位置ＳＣ２（＝５４、月マーク４２２による月相表示を行う）がある。なお、第１切替後月齢板ステップ位置ＳＣ１は、１朔望周期の月齢数に対応する月齢板４２のステップ数ＳＡ１とすると、ＳＡ１－ＳＲで求めることができる。また、第２切替後月齢板ステップ位置ＳＣ２は、２朔望周期の月齢数に対応する月齢板４２のステップ数ＳＡ２とすると、ＳＡ２－ＳＲで求めることができる。また、現在月齢板回転方向ＲＲに回転させた場合における現在月齢板ステップ位置ＳＲと第１切替後月齢板ステップ位置ＳＣ１との現在方向ステップ差分ＳＤＲが１８となり、切替後月齢板回転方向ＲＣに回転させた場合における現在月齢板ステップ位置ＳＲと第２切替後月齢板ステップ位置ＳＣ２との切替後方向ステップ差分ＳＤＣが１２となり、月齢板４２のステップ回転駆動としては、現在方向ステップ差分ＳＤＲよりも、切替後方向ステップ差分ＳＤＣのほうが少なくなる。 When a mode switching operation is performed, the control circuit 72 drives the age board 42 to rotate in steps by the third actuator 73c from the reference age MB to a post-switching age board step position SC corresponding to a post-switching age board rotation position corresponding to a post-switching age MC that is away from the reference age MB on the opposite side to the current age MR by the reference age difference MD, where the reference age difference MD is the age difference of the current age MR based on the current age board step position SR corresponding to the current age board rotation position relative to the reference age MB. Also, when a mode switching operation is performed, the control circuit 72 sets the age board rotation direction R to a post-switching age board rotation direction RC that is opposite to the current age board rotation direction RR. Here, the reference age MB corresponds to the lunar phase display of the full moon, and is the center of one synodic cycle, i.e., half the number of lunar ages in one synodic cycle. The reference age MB refers to the reference age corresponding to the synodic cycle at the current lunar age MR when the lunar phase display unit 4 displays the lunar phases corresponding to the lunar ages for two synodic cycle periods with one rotation of the lunar age board 42. In this embodiment, the total number of lunar ages in one synodic cycle is 30, from lunar age = 0 to lunar age = 29, so the reference age MB is set to 15. For example, as shown in Fig. 7, when the current lunar age board step position SR of the lunar age board 42 is 6 (SR = 6) and the corresponding current lunar age MR is 6 (MR = 6), if a mode switching operation is performed, the reference age difference MDB (= |MB-MR|), which is the age difference between the reference age MB and the current lunar age MR, becomes 9 (MD = 9). In this case, the post-switching lunar age MC, which is 9 lunar ages away from the reference lunar age MB on the current lunar age MR side (the left side of the dotted lunar display in the figure) and the opposite side (the right side in the figure), is 24 (MC=24). Note that the post-switching lunar age MC can be calculated by MA-MR, where MA is the number of lunar ages in one synodic cycle. Here, the lunar age board 42 in this embodiment has the post-switching lunar age board step positions SC corresponding to the post-switching lunar age MC, the number of which is the number of synodic cycles, i.e., two. This is because the lunar age board 42 can display the lunar phases for two synodic cycles. Specifically, as shown in Fig. 7, there is a first post-switching lunar age board step position SC1 which is a post-switching lunar age board step position SC in the current lunar age board rotation direction RR with respect to the current lunar age board step position SR, and as shown in Fig. 8, there is a second post-switching lunar age board step position SC2 which is a post-switching lunar age board step position SC in the post-switching lunar age board rotation direction RC with respect to the current lunar age board step position SR. For example, the post-switching lunar age board step position SC corresponding to the post-switching lunar age MC (=24) with respect to the current lunar age MR (=6) corresponding to the current lunar age board step position SR (=6, lunar phase display with the lunar mark 421) is the first post-switching lunar age board step position SC1 (=24, lunar phase display with the lunar mark 421) as shown in Fig. 7, and the second post-switching lunar age board step position SC2 (=54, lunar phase display with the lunar mark 422) as shown in Fig. 8. The first post-switching lunar age board step position SC1 can be calculated by SA1-SR, where SA1 is the number of steps of the lunar age board 42 that corresponds to the number of lunar ages in one synodic cycle. The second post-switching lunar age board step position SC2 can be calculated by SA2-SR, where SA2 is the number of steps of the lunar age board 42 that corresponds to the number of lunar ages in two synodic cycles. The current direction step difference SDR between the current lunar age board step position SR and the first post-switching lunar age board step position SC1 when rotated in the current lunar age board rotation direction RR is 18, and the post-switching direction step difference SDC between the current lunar age board step position SR and the second post-switching lunar age board step position SC2 when rotated in the post-switching lunar age board rotation direction RC is 12, so that the post-switching direction step difference SDC is less than the current direction step difference SDR in the step rotation drive of the lunar age board 42.
　制御回路７２は、月齢板４２を現在月齢板回転位置に対応する現在月齢板ステップ位置ＳＲから切替後月齢板回転位置に対応する切替後月齢板ステップ位置ＳＣまで現在月齢板回転方向ＲＲに回転させた場合における月齢板４２の回転角度である現在方向ステップ差分ＳＤＲが所定回転角度に対応する所定ステップ数ＳＤＴ未満であると、現在月齢板回転方向ＲＲに月齢板４２を回転させることで、月齢板４２を現在月齢板ステップ位置ＳＲから切替後月齢板ステップ位置ＳＣまでステップ回転駆動させ、現在方向ステップ差分ＳＤＲが所定ステップ数ＳＤＴ以上であると、切替後月齢板回転方向ＲＣに月齢板４２を回転させることで、月齢板４２を現在月齢板ステップ位置ＳＲから切替後月齢板ステップ位置ＳＣまでステップ回転駆動させるものである。ここで、所定回転角度に対応する所定ステップ数ＳＤＴは、現在方向回転角度に対応する現在方向ステップ差分ＳＤＲと、月齢板４２を現在月齢板回転位置に対応する現在月齢板ステップ位置ＳＲから切替後月齢板回転位置に対応する切替後月齢板ステップ位置ＳＣまで切替後月齢板回転方向ＲＣに回転させた場合における月齢板４２の回転角度である切替後回転角度に対応する切替後方向ステップ差分ＳＤＣとの差分（｜ＳＤＲ－ＳＤＣ｜）、および、月齢板回転方向Ｒを切り替える際における電子時計１の消費電力の少なくとも一方に基づいて設定されるものである。本実施形態における所定ステップ数ＳＤＴは、現在方向ステップ差分ＳＤＲと、切替後方向ステップ差分ＳＤＣとの差分（｜ＳＤＲ－ＳＤＣ｜）、および、月齢板回転方向Ｒを切り替える際における電子時計１の消費電力の両方に基づいて設定されており、２２に設定されている。電子時計１の消費電力は、月齢板回転方向Ｒを同一方向に月齢板４２を複数ステップ、ステップ回転駆動させる場合は、ステップ数が少ない方が小さくなる。また、電子時計１の消費電力は、月齢板４２を現在月齢板回転方向ＲＲに１ステップ回転駆動させる場合の消費電力よりも、切替後月齢板回転方向ＲＣに１ステップ回転駆動させる場合の消費電力が大きくなる場合がある。そのため、現在方向ステップ差分ＳＤＲよりも、切替後方向ステップ差分ＳＤＣが少ない場合であっても、月齢板回転方向Ｒによる消費電力の差を考慮すると、表示モード切替動作における消費電力は、月齢板回転方向Ｒを切替え、月齢板４２を切替後方向ステップ差分ＳＤＣステップ回転駆動させた方が大きくなることがある。そこで、本実施形態の電子時計１は、所定ステップ数ＳＤＴを現在方向ステップ差分ＳＤＲと、切替後方向ステップ差分ＳＤＣとの差分（｜ＳＤＲ－ＳＤＣ｜）、および、月齢板回転方向Ｒによる電子時計１の消費電力の差の両方に基づいて設定されているので、消費電力を抑制することができる。 The control circuit 72 rotates the age board 42 in the current age board rotation direction RR in a step-rotating manner from the current age board step position SR corresponding to the current age board rotation position to the switched age board step position SC corresponding to the switched age board rotation position when the current direction step difference SDR, which is the rotation angle of the age board 42 when rotated in the current age board rotation direction RR from the current age board step position SR corresponding to the current age board rotation position to the switched age board step position SC corresponding to the switched age board rotation position, is less than a predetermined number of steps SDT corresponding to the predetermined rotation angle, and rotates the age board 42 in the current age board rotation direction RR in a step-rotating manner from the current age board step position SR to the switched age board step position SC when the current direction step difference SDR is equal to or greater than the predetermined number of steps SDT. Here, the predetermined number of steps SDT corresponding to the predetermined rotation angle is set based on at least one of the difference (|SDR-SDC|) between the current direction step difference SDR corresponding to the current direction rotation angle and the post-switching direction step difference SDC corresponding to the post-switching rotation angle, which is the rotation angle of the moon board 42 when the moon board 42 is rotated in the post-switching moon board rotation direction RC from the current moon board step position SR corresponding to the current moon board rotation position to the post-switching moon board step position SC corresponding to the post-switching moon board rotation position, and the power consumption of the electronic watch 1 when switching the moon board rotation direction R. In this embodiment, the predetermined number of steps SDT is set based on both the difference (|SDR-SDC|) between the current direction step difference SDR and the post-switching direction step difference SDC, and the power consumption of the electronic watch 1 when switching the moon board rotation direction R, and is set to 22. When the moon board 42 is rotated in the same moon board rotation direction R by a plurality of steps, the power consumption of the electronic watch 1 is smaller when the number of steps is smaller. In addition, the power consumption of the electronic watch 1 may be greater when the moon board 42 is rotated one step in the post-switch moon board rotation direction RC than when the moon board 42 is rotated one step in the current moon board rotation direction RR. Therefore, even if the post-switch step difference SDC is smaller than the current direction step difference SDR, considering the difference in power consumption due to the moon board rotation direction R, the power consumption in the display mode switching operation may be greater when the moon board rotation direction R is switched and the moon board 42 is rotated by the post-switch step difference SDC. Therefore, in the electronic watch 1 of this embodiment, the predetermined number of steps SDT is set based on both the difference between the current direction step difference SDR and the post-switch step difference SDC (|SDR-SDC|) and the difference in power consumption of the electronic watch 1 due to the moon board rotation direction R, so power consumption can be reduced.
　アクチュエータ７３は、指針３１、日板３４、月齢板４２および機能針５１を回転駆動するものである。アクチュエータ７３は、駆動回路や駆動部等を含み、制御回路７２からの制御信号が駆動回路に入力され、入力された制御信号に基づいた駆動信号を駆動部に出力し、入力された駆動信号に基づいて駆動部が駆動する。本実施形態におけるアクチュエータ７３は、ステッピングモータやエレクトリックモータ等のステップ回転駆動を行うことができるモータであり、秒針３１ａを回転駆動する第１アクチュエータ７３ａと、分針３１ｂ、時針３１ｃを回転駆動する第２アクチュエータ７３ｂと、月齢板４２を回転駆動する月齢板用アクチュエータである第３アクチュエータ７３ｃと、機能針５１および日板３４を回転駆動する第４アクチュエータ７３ｄで構成されている。 The actuator 73 drives and rotates the hands 31, the date plate 34, the moon plate 42 and the function hand 51. The actuator 73 includes a drive circuit and a drive section, and receives a control signal from the control circuit 72 to the drive circuit, which outputs a drive signal based on the input control signal to the drive section, which then drives the drive section based on the input drive signal. The actuator 73 in this embodiment is a motor capable of step rotation drive such as a stepping motor or an electric motor, and is composed of a first actuator 73a that drives and rotates the second hand 31a, a second actuator 73b that drives and rotates the minute hand 31b and the hour hand 31c, a third actuator 73c that is an actuator for the moon plate and drives and rotates the moon plate 42, and a fourth actuator 73d that drives and rotates the function hand 51 and the date plate 34.
　輪列機構７４は、アクチュエータ７３が出力する駆動力を指針３１、日板３４、月齢板４２および機能針５１に伝達するものである。輪列機構７４は、輪列歯車等を含み、一端がアクチュエータ７３に連結され、他端が指針３１、日板３４、月齢板４２および機能針５１に連結されている。本実施形態における輪列機構７４は、第１アクチュエータ７３と秒針３１ａとを連結する第１輪列機構７４ａと、第２アクチュエータ７３ｂと、分針３１ｂ、時針３１ｃとを連結する第２輪列機構７４ｂと、第３アクチュエータ７３ｃと月齢板４２とを連結する第３輪列機構７４ｃと、第４アクチュエータ７３ｃと機能針５１および日板３４とを連結する第４輪列機構７４ｄで構成されている。 The train wheel mechanism 74 transmits the driving force output by the actuator 73 to the hands 31, the date dial 34, the moon phase plate 42, and the function hand 51. The train wheel mechanism 74 includes train wheel gears and the like, one end of which is connected to the actuator 73, and the other end of which is connected to the hands 31, the date dial 34, the moon phase plate 42, and the function hand 51. In this embodiment, the train wheel mechanism 74 is composed of a first train wheel mechanism 74a that connects the first actuator 73 to the second hand 31a, a second train wheel mechanism 74b that connects the second actuator 73b to the minute hand 31b and the hour hand 31c, a third train wheel mechanism 74c that connects the third actuator 73c to the moon phase plate 42, and a fourth train wheel mechanism 74d that connects the fourth actuator 73c to the function hand 51 and the date dial 34.
　発電機構７５は、外部エネルギーによって発電し、発電した電力を二次電池７６や制御回路７２などの電子部品に供給する。発電機構７５には、光エネルギーを変換する光電変換素子や、熱エネルギーを変換する熱電変換素子、振動エネルギー等の機械運動から発電する機械電気変換素子などを用いることができる。 The power generation mechanism 75 generates electricity using external energy and supplies the generated electricity to electronic components such as the secondary battery 76 and the control circuit 72. The power generation mechanism 75 can use a photoelectric conversion element that converts light energy, a thermoelectric conversion element that converts thermal energy, or a mechanoelectric conversion element that generates electricity from mechanical motion such as vibration energy.
　二次電池７６は、発電機構７５によって発電した電力を蓄電することができるとともに、制御回路７２やアクチュエータ７３、その他の電子部品等に供給する電力源である。二次電池７６には例えば、リチウムイオン電池や全固体電池等を用いることができる。 The secondary battery 76 can store the power generated by the power generation mechanism 75 and is a power source that supplies power to the control circuit 72, the actuator 73, and other electronic components. For example, a lithium ion battery or an all-solid-state battery can be used as the secondary battery 76.
　次に、電子時計１による表示モード切替動作について説明する。図９は、実施形態における電子時計の表示モード切替動作のフロー図である。なお、本実施形態における電子時計１の表示モード切替動作は、月齢板４２のステップ回転駆動動作も含んで説明する。まず、制御回路７２は、リューズ６１が１段の位置にあるか否かを判定する（ステップＳＴ１）。ここでは、制御回路７２は、ユーザーが表示モード切替動作または表示モードＤの確認を行うために、操作部６を操作する意思があるか否かを判定する。 Next, the display mode switching operation of the electronic watch 1 will be described. FIG. 9 is a flow diagram of the display mode switching operation of the electronic watch in this embodiment. Note that the display mode switching operation of the electronic watch 1 in this embodiment will be described including the step rotation drive operation of the moon phase board 42. First, the control circuit 72 determines whether or not the crown 61 is in the first position (step ST1). Here, the control circuit 72 determines whether or not the user intends to operate the operating unit 6 to perform a display mode switching operation or to confirm display mode D.
　次に、制御回路７２は、リューズ６１が１段の位置にないと判定する（ステップＳＴ１：ＮＯ）と、日が変更されているか否かを判定する（ステップＳＴ２）。ここでは、制御回路７２は、内部時刻に基づいて日情報が１カウント分カウントアップしたかないかを判定することで、月齢板４２のステップ回転駆動を行うか否かを判定する。 Next, if the control circuit 72 determines that the crown 61 is not in the first position (step ST1: NO), it determines whether the day has been changed (step ST2). Here, the control circuit 72 determines whether or not to perform step rotation drive of the moon phase plate 42 by determining whether or not the day information has counted up by one count based on the internal time.
　次に、制御回路７２は、日が変更されると判定する（ステップＳＴ２：Ｙｅｓ）と、月齢板４２のカウントＮが５８であるか否かを判定する（ステップＳＴ３）。ここでは、制御回路７２は、月齢板４２が１周６０ステップ（６０日）の２ステップ前、すなわち５８ステップ分ステップ回転駆動したか否かを判定する。なお、制御回路７２は、日が変更されていないと判定する（ステップＳＴ２：Ｎｏ）と、本制御周期を終了し、次の制御周期に移行する。 Next, if the control circuit 72 determines that the day has changed (step ST2: Yes), it determines whether the count N of the moon phase board 42 is 58 or not (step ST3). Here, the control circuit 72 determines whether the moon phase board 42 has rotated two steps before one revolution of 60 steps (60 days), that is, 58 steps. If the control circuit 72 determines that the day has not changed (step ST2: No), it ends this control cycle and moves to the next control cycle.
　次に、制御回路７２は、月齢板４２のカウントＮが５８でないと判定する（ステップＳＴ３：Ｎｏ）と、月齢板４２を１ステップ分回転駆動させる（ステップＳＴ４）。 Next, if the control circuit 72 determines that the count N of the moon age board 42 is not 58 (step ST3: No), it rotates the moon age board 42 one step (step ST4).
　次に、制御回路７２は、月齢板４２のカウントＮを１カウント分カウントアップし（ステップＳＴ５）、本制御周期を終了し、次の制御周期に移行する。 Next, the control circuit 72 increments the count N of the age board 42 by one count (step ST5), ends this control cycle, and moves to the next control cycle.
　また、制御回路７２は、月齢板４２のカウントＮが５８であると判定する（ステップＳＴ３：Ｙｅｓ）と、月齢板４２を２ステップ分回転駆動させる（ステップＳＴ４）。 In addition, if the control circuit 72 determines that the count N of the moon age board 42 is 58 (step ST3: Yes), it rotates the moon age board 42 by two steps (step ST4).
　次に、制御回路７２は、月齢板４２のカウントＮを０、すなわちリセットし（ステップＳＴ６）、本制御周期を終了し、次の制御周期に移行する。つまり、制御回路７２は、月齢板４２が１回転する間に、１回２ステップ分回転駆動させる。 Next, the control circuit 72 resets the count N of the moon phase board 42 to 0 (step ST6), ends this control cycle, and moves to the next control cycle. In other words, the control circuit 72 rotates the moon phase board 42 two steps once during one rotation.
　また、制御回路７２は、リューズ６１が１段の位置にあると判定する（ステップＳＴ１：Ｙｅｓ）と、現在表示モードＤＲに基づいて機能針５１をステップ回転駆動する（ステップＳＴ８）。 If the control circuit 72 determines that the crown 61 is in the first position (step ST1: Yes), it drives the function hand 51 to rotate in steps based on the current display mode DR (step ST8).
　次に、制御回路７２は、プッシュボダン６３が押圧されたか否かを判定する（ステップＳＴ９）。ここでは、制御回路７２は、ユーザーが表示モード切替動作の意思があるか否かを判定する。 Next, the control circuit 72 determines whether the push button 63 has been pressed (step ST9). Here, the control circuit 72 determines whether the user intends to switch the display mode.
　次に、制御回路７２は、プッシュボダン６３が押圧されたと判定する（ステップＳＴ９：Ｙｅｓ）と、現在表示モードＤＲが北半球表示モードＤＮであるか否かを判定する（ステップＳＴ１０）。なお、制御回路７２は、プッシュボダン６３が押圧されていないと判定する（ステップＳＴ９：Ｎｏ）と、リューズ６１が１段の位置にあるか否かの判定、すなわちステップＳＴ１を繰り返す。 Next, if the control circuit 72 determines that the push button 63 has been pressed (step ST9: Yes), it determines whether the current display mode DR is the Northern Hemisphere display mode DN (step ST10). If the control circuit 72 determines that the push button 63 has not been pressed (step ST9: No), it repeats the determination of whether the crown 61 is in the first position, i.e., step ST1.
　次に、制御回路７２は、現在表示モードＤＲが北半球表示モードＤＮであると判定する（ステップＳＴ１０：Ｙｅｓ）と、表示モードＤを北半球表示モードＤＮから南半球表示モードＤＳに変更し、切替後表示モードＤＣを南半球表示モードＤＳとする（ステップＳＴ１１）。 Next, when the control circuit 72 determines that the current display mode DR is the northern hemisphere display mode DN (step ST10: Yes), it changes the display mode D from the northern hemisphere display mode DN to the southern hemisphere display mode DS, and sets the post-switch display mode DC to the southern hemisphere display mode DS (step ST11).
　また、制御回路７２は、現在表示モードＤＲが北半球表示モードＤＮでないと判定する（ステップＳＴ１０：Ｎｏ）と、表示モードＤを南半球表示モードＤＮから北半球表示モードＤＮに変更し、切替後表示モードＤＣを北半球表示モードＤＮとする（ステップＳＴ１２）。 In addition, if the control circuit 72 determines that the current display mode DR is not the northern hemisphere display mode DN (step ST10: No), it changes the display mode D from the southern hemisphere display mode DN to the northern hemisphere display mode DN, and sets the post-switch display mode DC to the northern hemisphere display mode DN (step ST12).
　次に、制御回路７２は、現在月齢板ステップ位置ＳＲを取得する（ステップＳＴ１３）。 Next, the control circuit 72 acquires the current lunar age board step position SR (step ST13).
　次に、制御回路７２は、現在月齢板ステップ位置ＳＲに基づいて切替後月齢板ステップ位置ＳＣを算出する（ステップＳＴ１４）。ここでは、制御回路７２は、現在月齢板ステップ位置ＳＲに対して、現在月齢板回転方向ＲＲにおける第１切替後月齢板ステップ位置ＳＣ１を算出する。 Next, the control circuit 72 calculates the post-switching lunar board step position SC based on the current lunar board step position SR (step ST14). Here, the control circuit 72 calculates the first post-switching lunar board step position SC1 in the current lunar board rotation direction RR with respect to the current lunar board step position SR.
　次に、制御回路７２は、現在月齢板ステップ位置ＳＲと、第１切替後月齢板ステップ位置ＳＣ１とに基づいて、現在方向ステップ差分ＳＤＲを算出する（ステップＳＴ１５）。 Next, the control circuit 72 calculates the current direction step difference SDR based on the current lunar age board step position SR and the first post-switch lunar age board step position SC1 (step ST15).
　次に、制御回路７２は、現在方向ステップ差分ＳＤＲが所定ステップ数ＳＤＴ未満であるか否かを判定する（ステップＳＴ１６）。ここでは、制御回路７２は、切替後月齢板ステップ位置ＳＣまで、月齢板４２を現在月齢板回転方向ＲＲおよび切替後月齢板回転方向ＲＣのうちいずれかでステップ回転駆動させる方が電子時計１の消費電力を抑制できるか否かを判定する。 Next, the control circuit 72 determines whether the current direction step difference SDR is less than the predetermined number of steps SDT (step ST16). Here, the control circuit 72 determines whether driving the moon phase plate 42 to rotate in steps in either the current moon phase plate rotation direction RR or the switched moon phase plate rotation direction RC up to the switched moon phase plate step position SC will reduce power consumption of the electronic watch 1.
　次に、制御回路７２は、現在方向ステップ差分ＳＤＲが所定ステップ数ＳＤＴ未満であると判定する（ステップＳＴ１６：Ｙｅｓ）と、月齢板４２を切替後月齢板ステップ位置ＳＣ、すなわち第１切替後月齢板ステップ位置ＳＣ１まで、現在月齢板回転方向ＲＲにステップ回転駆動する（ステップＳＴ１７）。例えば、表示モードの切替動作前の表示モードが北半球モードＤＮであり、ＳＤＴ＝２２（所定回転角度１３２度）とした場合は、現在月齢ＭＲ＝１０において、切替動作が行われると、現在方向ステップ差分ＳＤＲ＝１０となり、所定ステップ数ＳＤＴ＝２２未満となるので、第１切替後月齢板ステップ位置ＳＣ１まで、現在月齢板回転方向ＲＲにステップ回転駆動する。 Next, when the control circuit 72 determines that the current direction step difference SDR is less than the predetermined number of steps SDT (step ST16: Yes), it drives the moon age board 42 to rotate in a stepwise manner in the current moon age board rotation direction RR to the post-switch moon age board step position SC, i.e., the first post-switch moon age board step position SC1 (step ST17). For example, if the display mode before the display mode switching operation is the Northern Hemisphere mode DN and SDT = 22 (predetermined rotation angle 132 degrees), when the switching operation is performed at the current moon age MR = 10, the current direction step difference SDR = 10, which is less than the predetermined number of steps SDT = 22, and so the moon age board 42 is rotated in a stepwise manner in the current moon age board rotation direction RR to the first post-switch moon age board step position SC1.
　また、制御回路７２は、現在方向ステップ差分ＳＤＲが所定ステップ数ＳＤＴ以上であると判定する（ステップＳＴ１６：Ｎｏ）と、月齢板４２を切替後月齢板ステップ位置ＳＣ、すなわち第２切替後月齢板ステップ位置ＳＣ２まで、切替後月齢板回転方向ＲＣにステップ回転駆動する（ステップＳＴ２０）。例えば、表示モードの切替動作前の表示モードが北半球モードＤＮであり、ＳＤＴ＝２２（所定回転角度１３２度）とした場合は、現在月齢ＭＲ＝３において、切替動作が行われると、現在方向ステップ差分ＳＤＲ＝２４となり、所定ステップ数ＳＤＴ＝２２以上となるので、第２切替後月齢板ステップ位置ＳＣ２まで、切替後月齢板回転方向ＲＣにステップ回転駆動する。 Furthermore, when the control circuit 72 determines that the current direction step difference SDR is equal to or greater than the predetermined number of steps SDT (step ST16: No), it drives the moon age board 42 to rotate in a stepwise manner in the post-switching moon age board rotation direction RC to the post-switching moon age board step position SC, i.e., the second post-switching moon age board step position SC2 (step ST20). For example, if the display mode before the display mode switching operation is the Northern Hemisphere mode DN and SDT = 22 (predetermined rotation angle 132 degrees), when the switching operation is performed at the current moon age MR = 3, the current direction step difference SDR = 24, which is equal to or greater than the predetermined number of steps SDT = 22, and so drives the moon age board 42 to rotate in a stepwise manner in the post-switching moon age board rotation direction RC to the second post-switching moon age board step position SC2.
　次に、制御回路７２は、月齢板回転方向Ｒを切替後月齢板回転方向ＲＣに変更する（ステップＳＴ１８）。ここでは、制御回路７２は、現在表示モードＤＲから切替後表示モードＤＣを変更する。 Next, the control circuit 72 changes the moon phase board rotation direction R to the post-switch moon phase board rotation direction RC (step ST18). Here, the control circuit 72 changes from the current display mode DR to the post-switch display mode DC.
　次に、制御回路７２は、切替後表示モードＤＣに基づいて機能針５１をステップ回転駆動させ（ステップＳＴ１９）、本制御周期を終了し、次の制御周期に移行する。なお、本実施形態における切替後表示モードＤＣに基づいた機能針５１のステップ回転駆動（ステップＳＴ１９）は、月齢板回転方向Ｒを切替後月齢板回転方向ＲＣに変更した（ステップＳＴ１８）後に行うが、これに限定されるものではなく、プッシュボダン６３が押圧されたと判定した（ステップＳＴ９：Ｙｅｓ）後から、現在月齢板ステップ位置ＳＲを取得する（ステップＳＴ１３）まで、すなわち表示モードＤの切替直後であってもよい。 Then, the control circuit 72 drives the function hand 51 to rotate in steps based on the post-switching display mode DC (step ST19), ends this control cycle, and moves to the next control cycle. Note that in this embodiment, the step rotation drive of the function hand 51 based on the post-switching display mode DC (step ST19) is performed after the moon phase plate rotation direction R is changed to the post-switching moon phase plate rotation direction RC (step ST18), but this is not limited to this, and may be performed from after it is determined that the push button 63 has been pressed (step ST9: Yes) until the current moon phase plate step position SR is obtained (step ST13), that is, immediately after switching to the display mode D.
　以上のように、本実施形態における電子時計１は、基準月齢ＭＢから現在月齢側と反対側に基準月齢差分ＭＤ離れた切替後月齢ＭＣに対応する切替後月齢板回転位置に対応する切替後月齢板ステップ位置ＳＣまで、月齢板４２を第３アクチュエータ７３ｃによりステップ回転駆動させるので、内部時刻に基づいて切替後半球用月齢を算出し、算出された切替後半球用月齢に対応した切替後月齢板回転位置まで月齢板を回転駆動する場合と比較して、月相表示部４の表示モードの切替動作における制御回路７２の演算負荷を抑制することができる。 As described above, in the electronic watch 1 of this embodiment, the third actuator 73c drives the moon phase plate 42 to rotate in steps from the reference moon age MB to the post-switch moon phase plate step position SC corresponding to the post-switch moon phase plate rotation position corresponding to the post-switch moon age MC that is away from the reference moon age difference MD on the opposite side to the current moon age side. This reduces the calculation load on the control circuit 72 in switching the display mode of the moon phase display unit 4 compared to when the post-switch moon phase is calculated based on the internal time and the post-switch moon phase plate is rotated to the post-switch moon phase plate rotation position corresponding to the calculated post-switch moon phase.
　また、本実施形態における電子時計１は、月齢板４２が６０ステップで１回転し、制御回路７２が月齢板４２を１日１ステップで回転駆動させ、５９日に１回、１日２ステップで月齢板４２をステップ回転駆動させるので、月齢板４２が２朔望周期を５９日で実施することになり、１朔望周期が２９．５日となり、１朔望周期が３０日の場合と比較して実際の月の平均朔望周期２９．５３０５８９に近づくことになる。したがって、月齢板４２における１朔望周期を３０日としても、平均朔望周期２９．５３０５８９に近づけることができ、月相表示が実際の月の月相との誤差を小さくすることができる。 In addition, in the electronic watch 1 of this embodiment, the moon phase plate 42 rotates once in 60 steps, and the control circuit 72 drives the moon phase plate 42 to rotate one step per day, and drives the moon phase plate 42 to rotate in two steps per day once every 59 days, so that the moon phase plate 42 completes two synodic cycles in 59 days, making one synodic cycle 29.5 days, which is closer to the actual lunar mean synodic cycle of 29.530589 compared to a synodic cycle of 30 days. Therefore, even if one synodic cycle on the moon phase plate 42 is 30 days, it is possible to approach the mean synodic cycle of 29.530589, and the error between the lunar phase display and the actual lunar phase of the moon can be reduced.
　なお、本実施形態における制御回路７２は、現在月齢板ステップ位置ＳＲから切替後月齢板回転位置に対応する切替後月齢板ステップ位置ＳＣまで現在月齢板回転方向ＲＲに回転させた場合における月齢板４２の回転角度である現在方向ステップ差分ＳＤＲが所定回転角度に対応する所定ステップ数ＳＤＴ未満であると、現在月齢板回転方向ＲＲに月齢板４２を回転させ、現在方向ステップ差分ＳＤＲが所定ステップ数ＳＤＴ以上であると、切替後月齢板回転方向ＲＣに月齢板４２を回転させるが、これに限定されるものではない。制御回路７２は、現在月齢板ステップ位置ＳＲから切替後月齢板回転位置に対応する切替後月齢板ステップ位置ＳＣまで正転方向ＲＹに回転させた場合における月齢板４２の回転角度である正転方向ステップ差分ＳＤＹが所定回転角度に対応する所定ステップ数ＳＤＴ未満であると、正転方向ＲＹに月齢板４２を回転させ、正転方向ステップ差分ＳＤＹが所定ステップ数ＳＤＴ以上であると、逆転方向ＲＮに月齢板４２を回転させてもよい。この場合、所定回転角度である所定ステップ数ＳＤＴは、正転方向回転角度である正転方向ステップ差分ＳＤＹと、月齢板４２を現在月齢板ステップ位置ＳＲから切替後月齢板ステップ位置ＳＣまで逆転方向ＲＮに回転させた場合における月齢板の回転角度である正転方向ステップ差分ＳＤＮとの差分、および、月齢板回転方向Ｒによる消費電力の差に基づいて設定されてもよい。通常、電子時計１の消費電力は、月齢板４２正転方向ＲＮに１ステップ回転駆動させる場合の消費電力よりも、逆転方向ＲＮに１ステップ回転駆動させる場合の消費電力が大きくなるため、所定ステップ数ＳＤＴを正転方向ステップ差分ＳＤＹと、逆転方向ステップ差分ＳＤＮとの差分（｜ＳＤＹ－ＳＤＮ｜）、および、月齢板回転方向Ｒ（正転方向ＲＹ、逆転方向ＲＮ）による電子時計１の消費電力の差の両方に基づいて設定されているので、消費電力を抑制することができる。 In addition, in this embodiment, the control circuit 72 rotates the age board 42 in the current age board rotation direction RR if the current direction step difference SDR, which is the rotation angle of the age board 42 when rotated in the current age board rotation direction RR from the current age board step position SR to the post-switched age board step position SC corresponding to the post-switched age board rotation position, is less than a specified number of steps SDT corresponding to the specified rotation angle, and rotates the age board 42 in the post-switched age board rotation direction RC if the current direction step difference SDR is equal to or greater than the specified number of steps SDT, but is not limited to this. The control circuit 72 may rotate the age board 42 in the forward direction RY when a forward direction step difference SDY, which is a rotation angle of the age board 42 when rotated in the forward direction RY from the current age board step position SR to a post-switching age board step position SC corresponding to the post-switching age board rotation position, is less than a predetermined number of steps SDT corresponding to a predetermined rotation angle, and may rotate the age board 42 in the reverse direction RN when the forward direction step difference SDY is equal to or greater than the predetermined number of steps SDT. In this case, the predetermined number of steps SDT, which is the predetermined rotation angle, may be set based on the difference between the forward direction step difference SDY, which is the forward direction rotation angle, and the forward direction step difference SDN, which is the rotation angle of the age board when the age board 42 is rotated in the reverse direction RN from the current age board step position SR to the post-switching age board step position SC, and the difference in power consumption due to the age board rotation direction R. Normally, the power consumption of the electronic watch 1 is greater when rotating the moon phase plate 42 one step in the reverse direction RN than when rotating it one step in the forward direction RN. Therefore, the specified number of steps SDT is set based on both the difference between the forward direction step difference SDY and the reverse direction step difference SDN (|SDY-SDN|) and the difference in power consumption of the electronic watch 1 depending on the moon phase plate rotation direction R (forward direction RY, reverse direction RN), thereby reducing power consumption.
　また、本実施形態における所定ステップ数ＳＤＴは、一定の値であるがこれに限定されるものではなく、現在表示モードＤＲに基づいて異ならせてもよい。例えば、所定ステップ数ＳＤＴは、現在表示モードＤＲが北半球表示モードＤＮである場合の値と、現在表示モードＤＲが南半球表示モードＤＮである場合の値とを異ならせてもよい。 In addition, the predetermined number of steps SDT in this embodiment is a fixed value, but is not limited to this, and may be different based on the current display mode DR. For example, the predetermined number of steps SDT may be different in value when the current display mode DR is the northern hemisphere display mode DN than in value when the current display mode DR is the southern hemisphere display mode DN.
　また、本実施形態においては、月マーク４２１，４２２が同一であるが、これに限定されているものではなく、月マーク４２１，４２２が互いに異なるものであってもよい。図１０は、変形例における表示モード切替動作時における月相表示部の動作説明の一例を示す図であり、現在月齢板回転位置と切替後月齢板回転位置とを同一の月マークで表示する例である。図１１は、変形例における表示モード切替動作時における月相表示部の動作説明の一例を示す図であり、現在月齢板回転位置と切替後月齢板回転位置とを異なる月マークで表示する例である。
　図１０および図１１に示すように、例えば、月マーク４２１，４２２の色を互いに異ならせることで、ユーザーが視認すると区別をすることができるようにしてもよい。この場合、例えば、現在月齢板ステップ位置ＳＲ（＝６、月マーク４２１による月相表示を行う）に対応する現在月齢ＭＲ（＝６）に対して切替後月齢ＭＣ（＝２４）に対応する切替後月齢板ステップ位置ＳＣは、図１０に示すように、第１切替後月齢板ステップ位置ＳＣ１（＝２４、月マーク４２１による月相表示を行う）と、図１１に示すように、第２切替後月齢板ステップ位置ＳＣ２（＝５４、月マーク４２２による月相表示を行う）がある。月マーク４２１，４２２が互いに異なる場合は、現在月齢板ステップ位置ＳＲ（＝６）から第１切替後月齢板ステップ位置ＳＣ１（＝２４）まで月齢板４２を回転駆動しても、月相表示に用いられる月マークは、同じ朔望周期に用いられる月マーク４２１となるため、月相表示部４を視認するユーザーにとって違和感が生じない。一方で、現在月齢板ステップ位置ＳＲ（＝６）から第２切替後月齢板ステップ位置ＳＣ２（＝５４）まで月齢板４２を回転駆動すると、月相表示に用いられる月マークは、月マーク４２１から切替動作前の朔望周期と異なる朔望周期に用いられる月マーク４２２となるため、月相表示部４を視認するユーザーにとって違和感が生じる。
　制御回路７２は、操作部６により表示モードの切り替え操作が行われたと判断すると、第１切替後月齢板ステップ位置ＳＣ１および第２切替後月齢板ステップ位置ＳＣ２のうち、現在月齢ＭＲにおける朔望周期の月相表示を行う月マーク４２１，４２２に対応する切替後月齢板回転位置である切替後月齢板ステップ位置ＳＣ１，ＳＣ２まで、月齢板４２を現在月齢板回転位置ＳＲから回転駆動させることで、月相表示部４を視認するユーザーにとって違和感が生じることを抑制することができる。
　具体的には、制御回路７２は、表示モードが北半球モードＤＮであり、現在月齢板ステップ位置ＳＲに基づいた現在月齢ＭＲが基準月齢ＭＢ未満（ＭＲ＜ＭＢ）の場合は、現在月齢板ステップ位置ＳＲから切替後月齢板ステップ位置ＳＣまで、正転方向ＲＹに回転駆動させる。また、制御回路７２は、表示モードが北半球モードＤＮであり、現在月齢板ステップ位置ＳＲに基づいた現在月齢ＭＲが基準月齢ＭＢを超える（ＭＲ＞ＭＢ）場合は、現在月齢板ステップ位置ＳＲから切替後月齢板ステップ位置ＳＣまで、逆転方向ＲＮに回転駆動させる。
　また、制御回路７２は、表示モードが南半球モードＤＳであり、現在月齢板ステップ位置ＳＲに基づいた現在月齢ＭＲが基準月齢ＭＢ未満（ＭＲ＜ＭＢ）の場合は、現在月齢板ステップ位置ＳＲから切替後月齢板ステップ位置ＳＣまで、逆転方向ＲＮに回転駆動させる。また、制御回路７２は、表示モードが南半球モードＤＳであり、現在月齢板ステップ位置ＳＲに基づいた現在月齢ＭＲが基準月齢ＭＢを超える（ＭＲ＞ＭＢ）場合は、現在月齢板ステップ位置ＳＲから切替後月齢板ステップ位置ＳＣまで、正転方向ＲＹに回転駆動させる。 In addition, in this embodiment, the moon marks 421 and 422 are the same, but this is not limited thereto, and the moon marks 421 and 422 may be different from each other. Fig. 10 is a diagram showing an example of an operation of the moon phase display unit during a display mode switching operation in a modified example, and is an example in which the current moon phase plate rotation position and the post-switch moon phase plate rotation position are displayed with the same moon mark. Fig. 11 is a diagram showing an example of an operation of the moon phase display unit during a display mode switching operation in a modified example, and is an example in which the current moon phase plate rotation position and the post-switch moon phase plate rotation position are displayed with different moon marks.
As shown in Figures 10 and 11, for example, the colors of the moon marks 421 and 422 may be different from each other so that the user can visually distinguish them. In this case, for example, the post-switching moon age board step position SC corresponding to the post-switching moon age MC (=24) for the current moon age MR (=6) corresponding to the current moon age board step position SR (=6, moon phase display by moon mark 421) is a first post-switching moon age board step position SC1 (=24, moon phase display by moon mark 421) as shown in Figure 10, and a second post-switching moon age board step position SC2 (=54, moon phase display by moon mark 422) as shown in Figure 11. When the moon marks 421, 422 are different from each other, even if the moon age board 42 is rotated from the current moon age board step position SR (=6) to the first switched moon age board step position SC1 (=24), the moon mark used to display the moon phase is the moon mark 421 used for the same lunar cycle, so no discomfort is felt by the user viewing the moon phase display unit 4. On the other hand, when the moon age board 42 is rotated from the current moon age board step position SR (=6) to the second switched moon age board step position SC2 (=54), the moon mark used to display the moon phase is changed from the moon mark 421 to the moon mark 422 used for a lunar cycle different from the lunar cycle before the switching operation, so discomfort is felt by the user viewing the moon phase display unit 4.
When the control circuit 72 determines that a display mode switching operation has been performed using the operating unit 6, it rotates the lunar age board 42 from the current lunar age board rotation position SR to the post-switched lunar age board step position SC1, SC2, which is the post-switched lunar age board rotation position corresponding to the moon marks 421, 422 that display the lunar phases of the syzygy cycle at the current lunar age MR, out of the first post-switched lunar age board step position SC1 and the second post-switched lunar age board step position SC2, thereby preventing the user viewing the lunar phase display unit 4 from feeling uncomfortable.
Specifically, when the display mode is the Northern Hemisphere mode DN and the current lunar age MR based on the current lunar age board step position SR is less than the reference lunar age MB (MR<MB), the control circuit 72 drives the rotation in the forward direction RY from the current lunar age board step position SR to the switched lunar age board step position SC. Also, when the display mode is the Northern Hemisphere mode DN and the current lunar age MR based on the current lunar age board step position SR is greater than the reference lunar age MB (MR>MB), the control circuit 72 drives the rotation in the reverse direction RN from the current lunar age board step position SR to the switched lunar age board step position SC.
Also, when the display mode is the southern hemisphere mode DS and the current lunar age MR based on the current lunar age board step position SR is less than the reference lunar age MB (MR<MB), the control circuit 72 drives and rotates in the reverse direction RN from the current lunar age board step position SR to the switched lunar age board step position SC. Also, when the display mode is the southern hemisphere mode DS and the current lunar age MR based on the current lunar age board step position SR is greater than the reference lunar age MB (MR>MB), the control circuit 72 drives and rotates in the forward direction RY from the current lunar age board step position SR to the switched lunar age board step position SC.
　また、本実施形態においては、月齢板４２は１日で１ステップ分ステップ回転駆動するが、本実施形態はこれに限定されるものではなく、月齢板４２は１日でｎステップ分ステップ回転駆動してもよい（ｎ＞１）。この場合、月齢板４２は、１日で１ステップ分ステップ回転駆動を行うことにより６０ステップで１回転する場合、１日でｎステップ分ステップ回転駆動を行うことにより６０×ｎステップで１回転することとなる。 In addition, in this embodiment, the moon phase board 42 is driven to rotate one step per day, but this embodiment is not limited to this, and the moon phase board 42 may be driven to rotate n steps per day (n>1). In this case, if the moon phase board 42 rotates once in 60 steps by performing step rotation drive of one step per day, it will rotate once in 60 x n steps by performing step rotation drive of n steps per day.
　また、本実施形態においては、月齢板４２の１回転で２朔望周期の朔望周期分の月齢に対応する月相表示を行うものであるがこれに限定されるものではなく、月齢板４２の１回転で１朔望周期の朔望周期分の月齢に対応する月相表示を行うものであってもよい。この場合、切替後月齢板ステップ位置ＳＣは、朔望周期の数、すなわち１つとなる。 In addition, in this embodiment, one rotation of the moon phase plate 42 displays the moon phase corresponding to the moon age for two synodic cycles, but this is not limited to this, and one rotation of the moon phase plate 42 may display the moon phase corresponding to the moon age for one synodic cycle. In this case, the moon phase plate step position SC after switching will be the number of synodic cycles, i.e., 1.
　また、本実施形態においては、制御回路７２が月齢板４２を１日１ステップで回転駆動させ、５９日に１回、１日２ステップで月齢板４２をステップ回転駆動させるものであるが、これに限定されるものではなく、内部時刻に基づいて２ヶ月に１回、１日２ステップで月齢板４２をステップ回転駆動させてもよい。また、本実施形態においては、月齢板４２が６０ステップで１回転するものであるが、これに限定されるものではなく、偶数ステップで１回転するものであればよく、例えば、月齢板４２が５８ステップで１回転するものであってもよい。この場合、制御回路７２は、月齢板４２のカウントＮが５８であると判定すると、１ステップ分回転駆動させ、月齢板４２のカウントＮを０とせず、さらに日が変更されると判定されると、１ステップ分回転駆動せず、月齢板４２のカウントＮを０とする。また、月齢板４２が奇数ステップで１回転するものであってもよく、例えば、月齢板４２が５９ステップで１回転するものであってもよい。この場合、基準月齢ＭＢが１４．５に設定されることとなる。 In this embodiment, the control circuit 72 rotates the moon age board 42 one step per day, and once every 59 days, the control circuit 72 rotates the moon age board 42 in two steps per day, but this is not limited to this, and the moon age board 42 may be rotated in two steps per day once every two months based on the internal time. In this embodiment, the moon age board 42 rotates once in 60 steps, but this is not limited to this, and it is sufficient that the moon age board 42 rotates once in an even number of steps, for example, the moon age board 42 may rotate once in 58 steps. In this case, when the control circuit 72 determines that the count N of the moon age board 42 is 58, it rotates it one step, and does not set the count N of the moon age board 42 to 0, and when it is determined that the day is to be changed, it does not rotate it one step, and sets the count N of the moon age board 42 to 0. In addition, the moon age board 42 may rotate once in an odd number of steps, for example, the moon age board 42 may rotate once in 59 steps. In this case, the reference age MB will be set to 14.5.
　また、本実施形態において月齢板４２の現在月齢板ステップ位置ＳＲは、ユーザーにより手動で設定されるがこれに限定されるものではなく、受信した時刻情報（西暦情報、月情報、日情報を含む）に基づいて制御回路７２が現在月齢板ステップ位置ＳＲの補正を行ってもよい。具体的には、制御回路７２は、（基準日からの日数Ｘ＋基準日の月齢Ｙ）％２９．５３＝補正月齢Ｗにより求める。例えば、Ｘが１５９３、Ｙ１４．７であると、Ｗは１３となる。 In addition, in this embodiment, the current lunar age board step position SR of the lunar age board 42 is manually set by the user, but is not limited to this, and the control circuit 72 may correct the current lunar age board step position SR based on the received time information (including year information, month information, and day information). Specifically, the control circuit 72 calculates the corrected lunar age W by (number of days from the reference date X + lunar age on the reference date Y) % 29.53 = corrected lunar age W. For example, if X is 1593 and Y is 14.7, W is 13.
　１　電子時計
　２　外装ケース
　２１　胴
　２２　ベゼル
　２３　風防
　２４　先かん
　３　時刻表示部
　３１　指針
　３２　文字板
　３２１，３２２　時字
　３２３　日板用開口
　３３　見返しリング
　３４　日板
　３４１　日マーク
　４　月相表示部
　４１　月齢板用開口
　４２１，４２２　凹部
　４２　月齢板
　４２１，４２２　月マーク
　４３，４４　月齢板回転方向マーク
　５　機能表示部
　５１　機能針
　５２　機能マーク板
　６　操作部
　６１　リューズ
　６２，６３　プッシュボタン
　７　ムーブメント
　７１　アンテナ
　７２　制御回路
　７３　アクチュエータ
　７３ａ　第１アクチュエータ
　７３ｂ　第２アクチュエータ
　７３ｃ　第３アクチュエータ（月齢板用アクチュエータ）
　７３ｄ　第４アクチュエータ
　７４　輪列機構
　７４ａ　第１輪列機構
　７４ｂ　第２輪列機構
　７４ｃ　第３輪列機構
　７４ｄ　第４輪列機構
　７５　発電機構
　７６　二次電池
　８　ベルト
　Ｏ１　時計中心
　Ｏ２　月齢板中心
　Ｏ３　機能マーク中心
　 REFERENCE SIGNS LIST 1 Electronic watch 2 Exterior case 21 Body 22 Bezel 23 Windshield 24 Tip 3 Time display section 31 Hand 32 Dial 321, 322 Hour characters 323 Opening for date plate 33 Faceplate ring 34 Date plate 341 Date mark 4 Moon phase display section 41 Opening for moon phase plate 421, 422 Recess 42 Moon phase plate 421, 422 Moon mark 43, 44 Moon phase plate rotation direction mark 5 Function display section 51 Function hand 52 Function mark plate 6 Operation section 61 Crown 62, 63 Push button 7 Movement 71 Antenna 72 Control circuit 73 Actuator 73a First actuator 73b Second actuator 73c Third actuator (actuator for moon phase plate)
73d Fourth actuator 74 Wheel train mechanism 74a First wheel train mechanism 74b Second wheel train mechanism 74c Third wheel train mechanism 74d Fourth wheel train mechanism 75 Power generation mechanism 76 Secondary battery 8 Belt O1 Clock center O2 Moon phase board center O3 Function mark center

Claims (8)

  1. 　内部時刻に基づいて時刻表示を行う時刻表示部と、
    　少なくとも回転自在に支持された月齢板を有し、前記月齢板が回転することで月齢に対応する月相表示を行う月相表示部と、
    　前記月齢板を回転駆動する月齢板用アクチュエータと、
    　前記月齢板用アクチュエータにより前記月齢板の回転方向である月齢板回転方向および前記月齢板の回転位置である月齢板回転位置を制御する制御回路と、
    　少なくとも北半球における月相を表示する北半球表示モードおよび南半球における月相を表示する南半球表示モードのいずれか一方に月相表示部の表示モードを切り替える操作部と、
    　を備え、
    　前記制御回路は、
    　前記操作部により前記表示モードの切り替え操作が行われたと判断すると、
    　基準月齢に対する現在月齢板回転位置に基づいた現在月齢の月齢差を基準月齢差分とした場合に、前記基準月齢から現在月齢側と反対側に前記基準月齢差分離れた切替後月齢板回転位置まで、前記月齢板を前記月齢板用アクチュエータにより前記現在月齢板回転位置から回転駆動させ、前記月齢板回転方向を現在月齢板回転方向と反対方向である切替後月齢板回転方向とする、
    　ことを特徴とする電子時計。     a time display unit that displays the time based on the internal time;
    a lunar phase display unit having at least a lunar phase plate supported for rotation, the lunar phase display unit displaying a lunar phase corresponding to the lunar age by rotating the lunar phase plate;
    An actuator for driving the moon phase board to rotate;
    a control circuit for controlling a rotation direction of the moon board, which is a direction in which the moon board rotates, and a rotation position of the moon board, which is a position in which the moon board rotates, by the moon board actuator;
    an operation unit for switching a display mode of the lunar phase display unit to at least one of a northern hemisphere display mode for displaying the lunar phase in the northern hemisphere and a southern hemisphere display mode for displaying the lunar phase in the southern hemisphere;
    Equipped with
    The control circuit includes:
    When it is determined that the operation for switching the display mode has been performed by the operation unit,
    When a lunar age difference of a current lunar age based on a current lunar age board rotation position with respect to a reference lunar age is defined as a reference lunar age difference, the lunar age board is rotated from the current lunar age board rotation position by the lunar age board actuator to a post-switched lunar age board rotation position away from the reference lunar age on the opposite side to the current lunar age side by the reference lunar age difference, and the lunar age board rotation direction is set to a post-switched lunar age board rotation direction that is opposite to the current lunar age board rotation direction.
    An electronic watch characterized by:
  2. 　前記制御回路は、
    　前記月齢板を前記現在月齢板回転位置から前記切替後月齢板回転位置まで前記現在月齢板回転方向に回転させた場合における前記月齢板の回転角度である現在方向回転角度が所定回転角度以上であると、前記切替後月齢板回転方向に前記月齢板を回転させて、
    　前記月齢板を前記現在月齢板回転位置から前記切替後月齢板回転位置まで回転させる、
    　請求項１に記載の電子時計。     The control circuit includes:
    When the moon board is rotated in the current moon board rotation direction from the current moon board rotation position to the switched moon board rotation position, if a current direction rotation angle, which is a rotation angle of the moon board, is equal to or larger than a predetermined rotation angle, the moon board is rotated in the switched moon board rotation direction,
    Rotating the moon phase board from the current moon phase board rotation position to the switched moon phase board rotation position;
    2. The electronic watch according to claim 1.
  3. 　前記所定回転角度は、
    　前記現在方向回転角度と、前記月齢板を前記現在月齢板回転位置から前記切替後月齢板回転位置まで前記切替後月齢板回転方向に回転させた場合における前記月齢板の回転角度である切替後回転角度との差分、および、前記月齢板回転方向による消費電力差の少なくとも一方に基づいて設定される、
    　請求項２に記載の電子時計。     The predetermined rotation angle is
    is set based on at least one of a difference between the current direction rotation angle and a post-switching rotation angle, which is a rotation angle of the moon board when the moon board is rotated from the current moon board rotation position to the post-switching moon board rotation position in the post-switching moon board rotation direction, and a power consumption difference due to the moon board rotation direction.
    3. The electronic watch according to claim 2.
  4. 　前記制御回路は、
    　前記月齢板を前記現在月齢板回転位置から前記切替後月齢板回転位置まで前記月齢板用アクチュエータの正転方向に回転させた場合における前記月齢板の回転角度である正転方向回転角度が所定回転角度以上であると、前記正転方向と反対方向である逆転方向に前記月齢板を回転させて、
    　前記月齢板を前記現在月齢板回転位置から前記切替後月齢板回転位置まで回転させる、
    　請求項１に記載の電子時計。     The control circuit includes:
    When the moon board is rotated in the forward direction of the moon board actuator from the current moon board rotation position to the switched moon board rotation position, if the forward direction rotation angle, which is the rotation angle of the moon board, is equal to or greater than a predetermined rotation angle, the moon board is rotated in a reverse direction, which is the opposite direction to the forward direction,
    Rotating the moon phase board from the current moon phase board rotation position to the switched moon phase board rotation position;
    2. The electronic watch according to claim 1.
  5. 　前記所定回転角度は、
    　前記正転方向回転角度と、前記月齢板を前記現在月齢板回転位置から前記切替後月齢板回転位置まで前記逆転方向に回転させた場合における前記月齢板の回転角度である逆転方向回転角度との差分、および、前記月齢板回転方向による消費電力の差の少なくとも一方に基づいて設定される、
    　請求項４に記載の電子時計。     The predetermined rotation angle is
    The forward rotation angle is set based on at least one of a difference between the forward rotation angle and a reverse rotation angle, which is a rotation angle of the moon age board when the moon age board is rotated in the reverse direction from the current moon age board rotation position to the switched moon age board rotation position, and a difference in power consumption due to the moon age board rotation direction.
    5. The electronic watch according to claim 4.
  6. 　前記月相表示部は、前記月齢板の１回転で２朔望周期以上の朔望周期分の月齢に対応する月相表示を行うものであり、
    　前記切替後月齢板回転位置は、前記現在月齢板回転位置に対して、前記現在月齢板回転方向における前記切替後月齢板回転位置である第１切替後月齢板回転位置と、前記現在月齢板回転位置に対して、前記切替後月齢板回転方向における前記切替後月齢板回転位置である第２切替後月齢板回転位置とである、
    　請求項１～５のいずれか１つに記載の電子時計。     the lunar phase display unit displays lunar phases corresponding to lunar ages for two or more lunar cycles per one rotation of the lunar age plate,
    The post-switching lunar age board rotation position is a first post-switching lunar age board rotation position that is the post-switching lunar age board rotation position in the current lunar age board rotation direction relative to the current lunar age board rotation position, and a second post-switching lunar age board rotation position that is the post-switching lunar age board rotation position in the post-switching lunar age board rotation direction relative to the current lunar age board rotation position.
    6. The electronic watch according to claim 1,
  7. 　前記月齢板用アクチュエータは、前記月齢板をステップ回転駆動させるものであり、
    　前記月相表示部は、前記月齢板の１回転で２朔望周期の朔望周期分の月齢に対応する月相表示を行うものであり、
    　前記月齢板は、６０ステップで１回転であり、
    　前記制御回路は、
    　前記月齢板を１日１ステップで前記月齢板用アクチュエータにより回転駆動させるものであり、
    　５９日に１回若しくは２ヶ月に１回、１日２ステップで前記月齢板用アクチュエータによりステップ回転駆動させる、
    　請求項６に記載の電子時計。     The moon phase board actuator drives the moon phase board to rotate in steps,
    the lunar phase display unit displays the lunar phase corresponding to the lunar age for two lunar cycles per one rotation of the lunar age plate,
    The moon phase plate rotates once in 60 steps,
    The control circuit includes:
    The moon phase board is rotated by the moon phase board actuator at one step per day,
    The actuator for the moon phase plate is driven to rotate in two steps per day, once every 59 days or once every two months.
    7. The electronic watch according to claim 6.
  8. 　前記月相表示部は、前記月齢板の１回転で２朔望周期の朔望周期分の月齢に対応する月相表示を行うものであり、かつ、前記月齢板に形成される２つの月マークが互いに異なるものであり、
    　前記切替後月齢板回転位置は、前記現在月齢板回転位置に対して、前記現在月齢板回転方向における前記切替後月齢板回転位置である第１切替後月齢板回転位置と、前記現在月齢板回転位置に対して、前記切替後月齢板回転方向における前記切替後月齢板回転位置である第２切替後月齢板回転位置とであり、
    　前記制御回路は、
    　前記操作部により前記表示モードの切り替え操作が行われたと判断すると、
    　２つの前記切替後月齢板回転位置のうち、前記現在月齢における朔望周期の前記月相表示を行う前記月マークに対応する前記切替後月齢板回転位置まで、前記月齢板を前記月齢板用アクチュエータにより前記現在月齢板回転位置から回転駆動させる、
    　請求項１に記載の電子時計。     the lunar phase display unit displays the lunar phase corresponding to the lunar age for two lunar cycles per one rotation of the lunar age plate, and the two lunar marks formed on the lunar age plate are different from each other;
    The post-switching lunar age board rotation position is a first post-switching lunar age board rotation position that is the post-switching lunar age board rotation position in the current lunar age board rotation direction relative to the current lunar age board rotation position, and a second post-switching lunar age board rotation position that is the post-switching lunar age board rotation position in the post-switching lunar age board rotation direction relative to the current lunar age board rotation position,
    The control circuit includes:
    When it is determined that the operation for switching the display mode has been performed by the operation unit,
    the actuator for rotating the moon-age board from the current moon-age board rotation position to the switched moon-age board rotation position corresponding to the moon mark that displays the lunar phase of the synodic cycle at the current lunar age, out of the two switched moon-age board rotation positions;
    2. The electronic watch according to claim 1.
PCT/JP2023/034951 2022-10-27 2023-09-26 Electronic timepiece WO2024090100A1 (en)

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JP2022-171940 2022-10-27
JP2022171940A JP2024063829A (en) 2022-10-27 2022-10-27 Electronic clock

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004239912A (en) * 2003-02-07 2004-08-26 Richemont Internatl Sa Moon phase display mechanism
JP2016508614A (en) * 2013-03-01 2016-03-22 タイメックス グループ ユーエスエイ，インコーポレイテッド Wearable device with lunar phase display
JP2018155747A (en) * 2017-03-20 2018-10-04 ウーテーアー・エス・アー・マニファクチュール・オロロジェール・スイス Universal moon phase display

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004239912A (en) * 2003-02-07 2004-08-26 Richemont Internatl Sa Moon phase display mechanism
JP2016508614A (en) * 2013-03-01 2016-03-22 タイメックス グループ ユーエスエイ，インコーポレイテッド Wearable device with lunar phase display
JP2018155747A (en) * 2017-03-20 2018-10-04 ウーテーアー・エス・アー・マニファクチュール・オロロジェール・スイス Universal moon phase display

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