WO2017134938A1 - 光学素子駆動装置、交換レンズ及び撮像装置 - Google Patents
光学素子駆動装置、交換レンズ及び撮像装置 Download PDFInfo
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- WO2017134938A1 WO2017134938A1 PCT/JP2016/087290 JP2016087290W WO2017134938A1 WO 2017134938 A1 WO2017134938 A1 WO 2017134938A1 JP 2016087290 W JP2016087290 W JP 2016087290W WO 2017134938 A1 WO2017134938 A1 WO 2017134938A1
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- Prior art keywords
- optical element
- bearing
- cam
- axial direction
- ultrasonic motor
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/40—Optical focusing aids
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/282—Autofocusing of zoom lenses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/16—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors using travelling waves, i.e. Rayleigh surface waves
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/16—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors using travelling waves, i.e. Rayleigh surface waves
- H02N2/163—Motors with ring stator
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
Definitions
- This technology relates to a technical field of an optical element driving apparatus that moves an optical element by a driving force of an ultrasonic motor, an interchangeable lens and an imaging apparatus including the optical element driving apparatus.
- a photographing optical system having various optical elements such as a lens group is disposed inside.
- the optical element is moved in the optical axis direction (axial direction) by the optical element driving device, for example, zooming or focusing.
- Some optical element driving devices use an ultrasonic motor as a drive source (see, for example, Patent Document 1 and Patent Document 2).
- an ultrasonic motor By using an ultrasonic motor, a driven body (optical element) is increased. Positioning with accuracy is possible. Further, there is an advantage that the optical element can be held in a non-energized state by using an ultrasonic motor as a drive source.
- a rotor and a stator are provided, and a bending wave is generated in the stator by ultrasonic vibration, and the rotor is rotationally driven by the traveling wave, and the driving force is transmitted to the driven body. . Therefore, in order to efficiently transmit the traveling wave generated in the stator to the rotor, it is necessary to contact the rotor and the stator with a constant pressure.
- an ultrasonic motor is connected to the rotating ring, and the two holding rings fixed to the fixed cylinder and a part of the rotating ring are interposed.
- a ball is arranged to constitute a bearing portion. The driving force of the ultrasonic motor is transmitted from the rotating ring to the cylinder (moving frame) that holds the lens, and the cylinder and the lens are moved in the optical axis direction as the rotating ring rotates.
- the imaging device having the optical element driving device described in Patent Document 2 is configured to receive a force in the axial direction (thrust direction) generated in the cam ring which is a rotational driving body by a radial bearing structure. .
- the ball of the bearing is restrained by two holding rings in both the thrust direction and the radial direction, and vibrations are transferred from the bearing to the rotating ring or the ultrasonic motor.
- the structure is easy to transmit, and there is a risk that good characteristics of the ultrasonic motor and a smooth rotation state of the rotary drive body may not be ensured.
- the axial direction of the fulcrum shaft serving as the rotation center of the radial bearing is A force in the orthogonal direction is applied from the cam ring. Therefore, particularly when a large impact occurs, a large load is generated in the direction in which the fulcrum shaft is tilted, and there is a possibility that good characteristics of the ultrasonic motor and a smooth rotation state of the rotary drive body may not be ensured.
- the optical element driving device, the interchangeable lens, and the imaging device according to the present technology overcome the above-described problems and ensure a smooth rotation state of the rotary driving body with a simple structure without deteriorating the characteristics of the ultrasonic motor. With the goal.
- an optical element driving device includes an ultrasonic motor having a rotor and a stator, and a rotary driving body that rotates around the axis by the driving force of the ultrasonic motor and moves the optical element in the axial direction.
- a bearing that is rotatable in the direction around the axis, the ultrasonic motor, the rotary drive body, and a pressure spring that applies an urging force in the axial direction to the bearing, and the rotor by the pressure spring
- the stator is biased in a direction in which the stator is in contact with the stator, and is biased in a direction in which the rotary drive body and the bearing are in contact with each other.
- an urging force is applied in the direction in which the rotor and the stator are in contact with the ultrasonic motor from the pressure spring, and an urging force is applied in the direction in which both are in contact with the rotary drive body or the bearing from the pressure spring. Is done.
- a rectilinear fixing ring for guiding the optical element in the axial direction is provided, and the rectilinear fixing ring is biased by the pressure spring in the axial direction. It is preferable that a receiving portion for receiving the bearing or the rotary driving body is provided.
- the straight traveling fixed ring functions as a guide member for guiding the optical element and also functions as a receiving member for receiving the bearing or the rotary driving body.
- the pressure spring is formed in an annular shape.
- an urging force is applied to the entire circumference of the bearing, the rotary drive body and the ultrasonic motor by the pressure spring.
- a cam ring having a cam groove is used as the rotation driving body, and a cam pin slidably engaged with the cam groove is provided to hold the optical element. It is desirable that a moving frame is provided and the cam groove is formed in a concave shape by a wall surface having a bottom surface.
- the through hole is not formed in the rotary drive body, the rigidity of the rotary drive body is increased, and the driving force transmitted from the ultrasonic motor to the rotary drive body is hardly attenuated.
- the cam pin is provided with a bearing portion that can rotate with respect to the cam groove.
- an urging frame that is spaced apart from the moving frame in the axial direction and supported by the cam ring is provided. It is desirable to provide urging springs that urge in the axial direction away from each other or in directions approaching each other.
- the urging frame is provided with an engagement pin that is slidably engaged with the cam groove.
- both the cam pin and the engagement pin are slidably engaged with the cam groove.
- a retracting portion having a groove width larger than that of the other portion is formed at least at one end portion of the cam groove, and the cam pin serves as the retracting portion when the optical element is not used. It is desirable to be located.
- a rotational position detection sensor that detects a rotational position of the cam ring and a movement position detection sensor that detects a movement position of the moving frame are provided, and the rotational position detection sensor
- the position information of the optical element is calculated based on the detection result of the movement position detection sensor.
- the position information of the optical element is calculated based on the rotation position of the rotary driving body and the movement position of the moving frame.
- an interchangeable lens includes an optical element driving device that drives an optical element inside a cylindrical outer casing
- the optical element driving device includes an ultrasonic motor having a rotor and a stator, A rotary driving body that rotates around the axis by the driving force of the ultrasonic motor and moves the optical element in the axial direction, a bearing that can rotate around the axis, the ultrasonic motor, the rotary driving body, and the A pressure spring that applies a biasing force in the axial direction to the bearing, and is biased by the pressure spring in a direction in which the rotor and the stator are in contact with each other and in a direction in which the rotary drive body and the bearing are in contact with each other. It is a force.
- a biasing force is applied from the pressure spring to the ultrasonic motor in the direction in which the rotor and the stator are in contact, and the pressure spring is in a direction in which both are in contact with the rotary drive body or the bearing.
- the urging power to is granted.
- a rectilinear fixing ring that guides the optical element in the axial direction is provided, and the rectilinear fixing ring is urged by the pressure spring in the axial direction. It is desirable that a receiving portion for receiving a bearing or the rotary driving body is provided.
- the straight traveling fixed ring functions as a guide member for guiding the optical element and also functions as a receiving member for receiving the bearing or the rotary driving body.
- the pressure spring is formed in an annular shape.
- an urging force is applied to the entire circumference of the bearing, the rotary drive body and the ultrasonic motor by the pressure spring.
- a cam ring having a cam groove is used as the rotational drive body, and a moving frame that has a cam pin slidably engaged with the cam groove and holds the optical element. It is desirable that the cam groove is formed in a concave shape by a wall surface having a bottom surface.
- the through hole is not formed in the rotary drive body, the rigidity of the rotary drive body is increased, and the driving force transmitted from the ultrasonic motor to the rotary drive body is hardly attenuated.
- the cam pin is provided with a bearing portion rotatable with respect to the cam groove.
- a biasing frame that is spaced apart from the moving frame in the axial direction and supported by the cam ring is provided, and the moving frame and the biasing frame are arranged in the axial direction. It is desirable to provide urging springs for urging in directions away from each other or in directions closer to each other.
- the biasing frame is provided with an engagement pin that is slidably engaged with the cam groove.
- both the cam pin and the engagement pin are slidably engaged with the cam groove.
- a retracting portion having a groove width larger than that of the other portion is formed at least at one end portion of the cam groove, and the cam pin is positioned in the retracting portion when the optical element is not used. It is desirable.
- a rotation position detection sensor that detects a rotation position of the cam ring and a movement position detection sensor that detects a movement position of the moving frame are provided, and the rotation position detection sensor and the It is desirable that the position information of the optical element is calculated based on the detection result of the movement position detection sensor.
- the position information of the optical element is calculated based on the rotation position of the rotary driving body and the movement position of the moving frame.
- a movement position detection sensor for detecting a movement position of the movement frame and the detection sheet.
- the movement position detection sensor and the detection sheet have the movement frame in the optical axis direction. It is desirable that they are arranged in a positional relationship that they overlap each other in the direction perpendicular to the optical axis in all moving regions.
- the information written on the detection sheet is read by the movement position detection sensor regardless of the movement position of the movement frame in the optical axis direction.
- an imaging apparatus includes an optical element driving apparatus that drives an optical element, and an imaging element that converts an optical image captured via a photographing optical system into an electrical signal, and the optical element
- the driving device includes an ultrasonic motor having a rotor and a stator, a rotary driving body that rotates around the axis by the driving force of the ultrasonic motor and moves the optical element in the axial direction, and is rotatable around the axis A bearing, an ultrasonic motor, the rotary drive body, and a pressure spring that applies a biasing force in the axial direction to the bearing, and is biased by the pressure spring in a direction in which the rotor and the stator are in contact with each other. And is urged in a direction in which the rotary drive body and the bearing come into contact with each other.
- a biasing force is applied from the pressure spring to the ultrasonic motor in the direction in which the rotor and the stator are in contact, and the pressure spring is in a direction in which both are in contact with the rotary drive body or the bearing.
- the urging power to is granted.
- an urging force is applied from the pressure spring to the ultrasonic motor in the direction in which the rotor and the stator are in contact, and the pressure spring is applied in the direction in which both are in contact with the rotary drive body or the bearing. Since the force is applied, a smooth rotation state of the rotary drive body can be ensured with a simple structure without deteriorating the characteristics of the ultrasonic motor.
- FIGS. 2 to 12 show an embodiment of an optical element driving device, an interchangeable lens, and an imaging device according to the present technology
- this diagram is a perspective view of the imaging device that shows the interchangeable lens and the apparatus main body separately.
- It is an expanded sectional view which shows an optical element drive device etc.
- It is a conceptual diagram which shows the fixed ring for linear advance, the rotation drive body, a moving frame, and an urging
- It is a disassembled perspective view of a bearing.
- the imaging device of the present technology is applied to a still camera
- the interchangeable lens of the present technology is applied to an interchangeable lens that can be attached to and detached from the main body of the still camera
- the optical element driving device of the present technology is The present invention is applied to an optical element driving device provided in an interchangeable lens.
- the scope of application of the present technology is limited to a still camera, an interchangeable lens that can be attached to and detached from the main body of the still camera, and an optical element driving device provided in an interchangeable lens that can be attached to and detached from the main body of the still camera.
- the present technology includes various imaging devices incorporated in video cameras and other devices as imaging devices, interchangeable lenses that can be attached to and detached from the device bodies of these imaging devices, and attachment and detachment from the device bodies of these imaging devices
- the present invention can be widely applied to optical element driving devices provided in possible interchangeable lenses.
- the lens group shown below may include one or a plurality of lenses and other optical elements such as a diaphragm and an iris in addition to the lens group including one or a plurality of lenses.
- the imaging device 100 is configured by a device main body 200 and an interchangeable lens 300 (see FIG. 1).
- the present technology is a type in which a lens barrel having the same structure as the internal structure of the interchangeable lens 300 is incorporated in the apparatus main body, or a retractable type in which the lens barrel protrudes or is stored in the apparatus main body. Can also be applied.
- the apparatus main body 200 is configured by arranging necessary parts inside and outside the casing 201.
- various operation units 202, 202,... are arranged on the upper surface and the rear surface.
- the operation units 202, 202,... For example, a power button, a shutter button, a zoom knob, a mode switching knob, and the like are provided.
- a display (display unit) (not shown) is disposed on the rear surface of the housing 201.
- a circular opening 201 a is formed on the front surface of the housing 201, and a portion around the opening 201 a is provided as a mount portion 203 for attaching the interchangeable lens 300.
- An imaging element 204 such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) is disposed inside the housing 201, and the imaging element 204 is positioned behind the opening 201a.
- CCD Charge Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- the interchangeable lens 300 is an interchangeable lens for a digital single lens reflex camera, for example.
- a lens mount 301 that is bayonet-coupled to the mount portion 203 of the apparatus main body 200 is provided.
- the interchangeable lens 300 is provided with a zoom ring 302 and a focus ring 303. Manual zooming is performed by rotating the zoom ring 302, and manual focusing is performed by rotating the focus ring 303.
- the interchangeable lens 300 has an outer casing 304 formed in a substantially cylindrical shape and a photographing lens 305 disposed on the foremost side.
- the zoom ring 302 and the focus ring 303 are rotatably supported on the outer surface side of the outer casing 304.
- the optical element driving device 1 is arranged inside the outer casing 304 (see FIG. 2).
- the optical element driving apparatus 1 includes a straight traveling fixed ring 2, a rotary driving body 3, a bearing 4, and an ultrasonic motor 5.
- the fixed ring 2 for rectilinear movement has an axial direction in the front-rear direction, a supporting cylinder portion 6 formed in a substantially cylindrical shape, and a flange-shaped receiving portion 7 projecting outward from the front end portion of the supporting cylinder portion 6. 7 and a cylindrical portion 8 protruding forward from the outer peripheral portion.
- the support cylinder part 6 is longer in the front-rear direction than the cylindrical part 8, and has a threaded part 6a on the outer peripheral surface of the rear end part.
- a guide hole 6b and a straight hole 6c extending in the front-rear direction are formed in the support cylinder portion 6, and the guide hole 6b and the straight hole 6c are spaced apart in the circumferential direction (see FIGS. 2 and 3).
- three pairs of guide holes 6b and straight holes 6c are formed in the rectilinear fixed ring 2 at regular intervals in the circumferential direction.
- a moving position detection sensor 9 is attached to the inner surface of the support cylinder 6 (see FIG. 4).
- the receiving portion 7 is formed with an annular insertion recess 7a opened rearward (see FIG. 2).
- Rotational drive body 3 is, for example, a cam ring and is formed in a substantially cylindrical shape. Note that the rotary drive body 3 is not limited to a cam ring, and may be a helicoid or the like, for example.
- Rotational drive body 3 is supported by support cylinder portion 6 of straight traveling fixed ring 2 so as to be rotatable about its axis.
- the rotary drive body 3 is positioned on the outer peripheral side of the support cylinder portion 6, and is formed with a cylindrical cam drive portion 10, a flange-like pressing portion 11 projecting outward from the front end portion of the cam drive portion 10, and the cam. It has a flange-like pressed projection 12 that projects outward from a position near the rear end of the drive unit 10.
- the cam grooves 13, 13, and 13 are formed on the inner surface side of the cam drive unit 10 so as to be spaced apart in the circumferential direction (see FIGS. 2, 3, 5, and 6).
- the cam groove 13 is formed in a concave shape by a wall surface having a bottom surface 13a.
- a portion excluding both ends in the longitudinal direction of the cam groove 13 is formed as a sliding portion 14 having a constant groove width, and a retreat portion in which the groove width increases as the both ends of the cam groove 13 are separated from the sliding portion 14. 15 and 15 (see FIG. 6). Therefore, the groove width of the retracting portion 15 is larger than the groove width of the sliding portion 14.
- the retracting portion 15 may be formed only at one end portion in the longitudinal direction of the cam groove 13.
- An annular insertion recess 11a opened forward is formed on the front surface of the pressing portion 11 (see FIGS. 2, 5, and 6).
- a detection body 16 is attached to the outer peripheral surface of the cam driving unit 10, and a sensing sheet 17 is attached to the outer peripheral surface of the pressing unit 11 in a state where the longitudinal direction is the circumferential direction.
- a sensing sheet 17 rotational position information of the rotational driving body 3 is written.
- the bearing 4 includes a ball retainer 18, bearing balls 19, 19,... And raceway plates 20, 21 (see FIGS. 2 and 7).
- the ball retainer 18 is formed in an annular shape and has a plurality of ball holding holes that are spaced apart at equal intervals in the circumferential direction.
- the bearing balls 19, 19,... are inserted and held in the ball holding holes of the ball retainer 18, respectively.
- the raceway plates 20, 21 are formed in an annular shape having the same size as the ball retainer 18, and are rotatable with respect to the ball retainer 18 while being pressed against the bearing balls 19, 19,. .
- the front raceway plate 20 is inserted into the insertion concave portion 7 a formed in the receiving portion 7 of the rectilinear fixed ring 2, and the rear raceway plate 21 is inserted in the pressing portion 11 of the rotary drive body 3. It is inserted into the recess 11 a and is positioned between the receiving part 7 and the pressing part 11.
- the ultrasonic motor 5 has a stator 22 and a rotor 23 each formed in an annular shape (see FIGS. 2 and 8).
- the stator 22 is configured by coupling a piezoelectric element 22a and a metal ring 22b.
- a bending wave is generated in the metal ring 22b by the voltage applied to the piezoelectric element 22a, and the rotor 23 is rotationally driven by the traveling wave to generate a driving force.
- the ultrasonic motor 5 is positioned on the outer peripheral side of the rear end portion of the support cylinder portion 6 in the straight traveling fixed ring 2, and the rotor 23 is positioned on the rear side of the pressed protrusion 12 in the rotary drive body 3.
- annular damper 24 formed of a rubber material or the like is disposed between the rotor 23 and the pressed protrusion 12.
- a substantially annular rotation restricting member 25 is disposed between the stator 22 and the support cylinder portion 6, and an annular ring screw 26 is disposed on the rear side of the rotation restricting member 25.
- the ring screw 26 is screwed into the threaded portion 6 a of the support cylinder portion 6 and pressed against the rotation restricting member 25 from behind, and the rotation restricting member 25 is fixed to the support tube portion 6 by the ring screw 26.
- the rotation of the stator 22 relative to the straight traveling fixed ring 2 is restricted by a rotation restricting member 25.
- a pressure spring 27 is disposed on the rear side of the stator 22.
- the pressurizing spring 27 is, for example, a leaf spring formed in an annular shape, and a portion displaced forward in the circumferential direction and a portion displaced backward are alternately provided and formed in a wave shape in the front-rear direction as a whole.
- An annular pressure ring 28 is disposed on the rear side of the pressure spring 27. The pressing ring 28 is screwed into the screwing portion 6 a of the support cylinder portion 6 and pressed against the pressure spring 27 from behind, and the pressing spring 27 is pressed against the stator 22 by the pressing ring 28.
- the stator 22 When the pressure spring 27 is pressed against the stator 22, the stator 22 is biased toward the rotor 23, and the stator 22 is pressed against the rotor 23. Therefore, the rotor 23 is pressed against the pressed protrusion 12 via the damper 24, and the urging force of the pressure spring 27 is applied to the rotary drive body 3 via the ultrasonic motor 5 and the damper 24.
- the rotary drive body 3 is urged forward in the axial direction (front-rear direction) by the pressure spring 27, and the urging force of the pressure spring 27 is applied to the bearing 4 through the rotary drive body 3. Accordingly, since the front raceway plate 20 is inserted into the insertion recess 7 a of the straight traveling fixed ring 2 and received by the receiving portion 7, the rear raceway plate 21 is made to be bearing by the biasing force of the pressure spring 27. Are pressed against the balls 19, 19,... In the axial direction, and the bearing balls 19, 19, 19.
- a biasing force in the axial direction is applied to the ultrasonic motor 5, the rotary driving body 3, and the bearing 4 by the pressure spring 27, and the direction in which the rotor 23 and the stator 22 are in contact with each other. And is urged in a direction in which the rotary drive body 3 and the bearing 4 come into contact with each other.
- the pressurizing spring 27 is formed in an annular shape, an urging force is applied to the entire circumference of the bearing 4, the rotary driving body 3, and the ultrasonic motor 5 by the pressurizing spring 27.
- the stable rotation state of the bearing 4 and the rotary drive body 3 can be ensured without the tilt of the rotary drive body 3 with respect to the axial direction.
- a moving frame 29 is movably supported on the straight traveling fixed ring 2 and the rotary drive 3 (see FIG. 2).
- the moving frame 29 is guided by the straight traveling fixed ring 2 as the rotary drive body 3 rotates, and is moved in the optical axis direction (front-rear direction).
- the moving frame 29 has a holding frame portion 30 formed in a substantially cylindrical shape and cam pins 31, 31, 31 attached to the holding frame portion 30 (see FIGS. 2 and 9).
- the holding frame portion 30 holds a lens (or lens group) 32 which is an optical element.
- the cam pins 31, 31, 31 are attached at positions spaced apart at equal intervals in the circumferential direction of the holding frame portion 30.
- the cam pin 31 has a base portion 33 and bearing portions 34 and 35 (see FIG. 10).
- the base portion 33 includes a disk-like base portion 33a, a screw portion 33b protruding from the center portion of the base portion 33a, and a support shaft portion 33c protruding from the center portion of the base portion 33a in a direction opposite to the screw portion 33b. Yes.
- the bearing portions 34 and 35 are supported by the support shaft portion 33 c at positions opposite to the spacer 36.
- the bearing portions 34 and 35 can be independently rotated by a spacer 36.
- the cam pin 31 is attached by screwing the screw portion 33b to the holding frame portion 30.
- the detection sheet 37 is affixed to the moving frame 29 on the outer peripheral surface of the holding frame portion 30 with the longitudinal direction being the front-rear direction (see FIG. 4). In the detection sheet 37, movement position information of the movement frame 29 is written.
- the moving frame 29 holding the lens 32 has cam pins 31, 31, 31 inserted through the guide holes 6 b, 6 b, 6 b of the fixed ring 2 for straight advance and inserted into the cam grooves 13, 13, 13 of the rotary drive 3.
- the cam pin 31 is slidably supported in a state where the bearing portion 34 is rotatable in the guide hole 6 b, and is slidably supported in the state where the bearing portion 35 is rotatable in the cam groove 13.
- the cam pin 31 has the two bearing portions 34 and 35 independently rotatable, when the moving frame 29 is moved, the bearing portion 34 and the bearing portion 35 respectively move with respect to the guide hole 6 b and the cam groove 13.
- the moving frame 29 can be smoothly moved in the optical axis direction.
- the positions of the moving frame 29 and the lens 32 with respect to the cam grooves 13, 13, 13 of the cam pins 31, 31, 31 are changed as the rotational driving body 3 rotates in the direction around the axis by the driving force of the ultrasonic motor 5. And is guided in the guide holes 6b, 6b, 6b and moved in the optical axis direction.
- the information written in the detection sheet 37 is read by the movement position detection sensor 9 attached to the inner peripheral surface of the straight traveling fixed ring 2, and the movement position of the movement frame 29 is detected.
- the detection sheet 37 is a magnetic scale in which N poles and S poles are alternately arranged in the optical axis direction.
- the moving position detection sensor 9 is a sensor that can detect a change in magnetic poles.
- an MR (Magneto Resistive) sensor is used. Used.
- the movement position detection sensor 9 is always located in a range in which a change in the magnetic pole of the detection sheet 37 can be detected.
- the detection sheet 37 exists in the direction perpendicular to the optical axis from the moving position detection sensor 9, and the moving frame 29 is positioned on the other end side in the optical axis direction.
- the moving position detecting sensor 9 and the detecting sheet 37 are arranged so that the detecting sheet 37 exists in a direction perpendicular to the optical axis from the moving position detecting sensor 9 even when the moving position is detected.
- the movement position detection sensor 9 and the detection sheet 37 are arranged in such a positional relationship, the movement position detection sensor 9 writes the detection sheet 37 regardless of the movement position of the movement frame 29 in the optical axis direction. Since the information is read, it is possible to improve the reliability of the detection operation related to the movement position of the moving frame 29 in the optical axis direction.
- the cam groove 13 is formed in a concave shape by the wall surface having the bottom surface 13a, the rotation drive body 3 is not formed with a through hole, and the rigidity of the rotation drive body 3 is increased.
- the driving force transmitted from 5 to the rotary drive body 3 is not easily attenuated, so that a stable operation state of the rotary drive body 3 can be secured and power consumption can be reduced.
- the urging frame 38 is movably supported on the straight moving fixed ring 2 and the rotary drive body 3 (see FIG. 2).
- the urging frame 38 is guided by the straight traveling fixed ring 2 and moved in the optical axis direction (front-rear direction) as the rotary drive body 3 rotates.
- the urging frame 38 includes an annular portion 39 formed in an annular shape, pin attachment portions 40, 40, 40 protruding forward from the annular portion 39, and engagement portions attached to the tip portions of the pin attachment portions 40, 40, 40. It has a combination pin 41, 41, 41 (see FIG. 2 and FIG. 9).
- the pin mounting portions 40, 40, 40 protrude from positions spaced apart at equal intervals in the circumferential direction of the annular portion 39.
- the engagement pin 41 has, for example, a structure similar to that of the cam pin 31 and has a base portion and a pair of bearing portions, although detailed description thereof is omitted.
- a biasing spring 42 is positioned between the holding frame portion 30 of the moving frame 29 and the annular portion 39 of the biasing frame 38.
- the biasing spring 42 is, for example, a leaf spring formed in an annular shape, and a portion that is displaced forward in the circumferential direction and a portion that is displaced rearward are alternately provided and formed in a shape that undulates in the front-rear direction as a whole. Has been.
- the moving frame 29 and the biasing frame 38 are biased in opposite directions by the biasing spring 42, the moving frame 29 is biased forward, and the biasing frame 38 is biased backward.
- the urging frame 38 goes straight when the engaging pins 41, 41, 41 are inserted through the guide holes 6 b, 6 b, 6 b of the fixed ring 2 for straight advance and are inserted into the cam grooves 13, 13, 13 of the rotary drive 3.
- the stationary ring 2 and the rotary driving body 3 are supported movably.
- the engagement pin 41 is slidably supported in a state where one bearing portion is rotatable in the guide hole 6 b, and is slidably supported in the state where the other bearing portion is rotatable in the cam groove 13.
- the positions of the urging frames 38 with respect to the cam grooves 13, 13, 13 of the engaging pins 41, 41, 41 are changed as the rotational driving body 3 rotates in the direction around the axis by the driving force of the ultrasonic motor 5. And is guided in the guide holes 6b, 6b, 6b and moved in the optical axis direction. Therefore, the urging frame 38 is moved in the optical axis direction together with the moving frame 29.
- the urging frame 38 and the moving frame 29 that are positioned apart from the moving frame 29 in the axial direction and supported by the rotary driving body 3 are moved with respect to the urging frame 38.
- a biasing spring 42 that biases in the axial direction is provided.
- the cam pin 31 of the moving frame 29 is pressed against the wall surface forming the cam groove 13, the positional accuracy of the lens 32 with respect to the rotary drive body 3 is increased, and the optical performance of the imaging device 100 can be improved.
- both the cam pin 31 and the engagement pin 41 are slidably engaged with the cam groove 13.
- the shape of the rotary drive body 3 can be simplified, and a decrease in the rigidity of the rotary drive body 3 can be suppressed.
- the engaging pin 41 has a structure similar to that of the cam pin 31 and has a pair of bearing portions, when the moving frame 29 and the lens 32 are moved in the optical axis direction, the straight traveling fixed ring 2 and the rotary driving body 3 are moved. As a result, the frictional force of the engaging pin 41 is reduced, and the load on the straight traveling fixed ring 2, the rotary drive body 3, and the ultrasonic motor 5 can be reduced.
- the moving frame 29 and the biasing frame 38 are biased in the opposite directions by the biasing spring 42. Conversely, the moving frame 29 and the biasing frame 38 are biased by the biasing spring. It may be urged in directions approaching each other.
- a sensor holding plate 43 is attached to the straight traveling fixed ring 2 (see FIGS. 2 and 4).
- the sensor holding plate 43 is formed in a shape extending in the front-rear direction, and a front end portion is attached to a position extending from the tubular portion 8 to the receiving portion 7 in the fixed ring 2 for straight advancement.
- the sensor holding plate 43 is positioned along the outer peripheral surface of the support cylinder portion 6 in the straight traveling fixed ring 2.
- On the sensor holding plate 43, a rotational position detection sensor 44 and a reset position detection sensor 45 are held at a position separated in the front-rear direction on the surface facing the support cylinder portion 6.
- the moving position of the moving frame 29 is detected by the moving position detection sensor 9 as described above. Therefore, when the rotation drive body 3 rotates, the movement position detection sensor 9 detects the movement position of the moving frame 29 and the rotation position detection sensor 44 detects the rotation position of the rotation drive body 3.
- the level of the detection value related to the movement position of the moving frame 29 by the movement position detection sensor 9 and the level of the detection value related to the rotation position of the rotation driving body 3 by the rotation position detection sensor 44 are the smooth movement of the movement frame 29 and the rotation driving body. 3 is the same level (equivalent) in the state where the smooth rotation is performed.
- the level of the detection value related to the movement position of the moving frame 29 by the movement position detection sensor 9 and the level of the detection value related to the rotation position of the rotary drive body 3 by the rotation position detection sensor 44 move due to rattling or the like caused by vibration or the like.
- a difference occurs when the smooth movement of the frame 29 or the smooth rotation of the rotary drive 3 is hindered.
- it is possible to calculate the displacement of the center position of the lens 32 and the inclination of the lens 32 based on the level difference of the detection values.
- the position information of the lens 32 is calculated based on the detection results of the movement position detection sensor 9 and the rotation position detection sensor 44. Therefore, the position information of the lens 32 is calculated based on the rotation position of the rotation drive body 3 and the movement position of the moving frame 29, and a dedicated sensor for detecting the position of the lens 32 is not required, and the structure in the optical element driving device 1 is achieved. Can be simplified.
- the moving frame 29 and the lens 32 are connected to the cam grooves 13 of the cam pins 31, 31, 31.
- the positions with respect to 13 and 13 are changed and are guided in the guide holes 6b, 6b and 6b and moved in the optical axis direction. Focusing and zooming are performed by moving the lens 32 in the optical axis direction.
- the sliding portion 14 is a portion used when focusing or zooming is performed, and the retracting portion 15 is not used when focusing or zooming is performed.
- the power button is operated, the power is cut off, and the energization to the interchangeable lens 300 is stopped, the interchangeable lens 300 and its lens 32 are not used.
- the moving frame 29 is moved to the moving end in the optical axis direction, and the cam pins 31, 31, 31 are moved to the retracting portions 15, 15, 15 of the cam grooves 13, 13, 13, respectively. Is done. Therefore, the engagement state of the cam pin 31 with the sliding portion 14 is released.
- the cam pin 31 when the lens 32 is not in use, the cam pin 31 is positioned in the retracting portion 15 of the cam groove 13, so that when an impact or the like occurs in the non-use state, the cam pin 31 is displaced in the retracting portion 15. Therefore, even when the cam pin 31 is displaced in the cam groove 13 and comes into contact with the wall surface forming the cam groove 13, the cam pin 31 comes into contact with the wall surface forming the retracting portion 15, so that the sliding portion 14 is damaged by the cam pin 31. Even in the event of an impact or the like, good optical performance during focusing or zooming can be ensured.
- the cam pin 31 has metal bearing portions 34 and 35. Since the cam groove 13 is easily damaged when the cam pin 31 is displaced in the cam groove 13, the retracting portion 15 is formed in the cam groove 13. This is particularly effective in securing good optical performance during focusing and zooming.
- manual zooming or manual focusing can be performed by manually rotating the zoom ring 302 or the focus ring 303.
- the rotation amount of the focus ring 303 is detected, and a driving force corresponding to the detection result is generated in the ultrasonic motor 5, so that the moving frame 29 becomes the rotation amount of the focus ring 303. It is moved by the corresponding distance and focusing is performed.
- the moving frame 29 is moved based on the detection result of the rotation amount of the focus ring 303, and thus a transmission mechanism (which transmits the rotational force of the focus ring 303 to the moving frame 29 ( There is no need to provide a speed reduction mechanism, and the size and weight can be reduced accordingly.
- the interchangeable lens 300 may be provided with an optical element driving device for zooming having the same structure as the optical element driving device 1 operated when the zoom ring 302 is rotated. Based on the detection result of the rotation amount of the zoom ring 302, the moving frame in the optical element driving device for zooming is moved to perform zooming.
- the optical element driving device 1 may be a device for both focusing and zooming.
- FIG. 11 shows a block diagram of an embodiment of the imaging device of the present technology.
- the imaging apparatus 100 includes an interchangeable lens 300 that performs an imaging function, a camera signal processing unit 81 that performs signal processing such as analog-digital conversion of a captured image signal, and an image processing unit 82 that performs recording and reproduction processing of the image signal. have.
- the imaging apparatus 100 includes a display unit (display) 83 that displays captured images and the like, an R / W (reader / writer) 84 that writes and reads image signals to and from the memory 90, and the imaging apparatus 100.
- a central processing unit (CPU) 85 that controls the whole, an operation unit 202 such as various switches that are operated by a user, and a lens drive control unit that controls driving of the lens 32 disposed in the interchangeable lens 300 86.
- the interchangeable lens 300 includes an optical system including the lens 32, an image sensor 204 such as a CCD (Charge Coupled Device) and a CMOS (Complementary Metal-Oxide Semiconductor).
- an image sensor 204 such as a CCD (Charge Coupled Device) and a CMOS (Complementary Metal-Oxide Semiconductor).
- the camera signal processing unit 81 performs various signal processing such as conversion of the output signal from the image sensor 204 into a digital signal, noise removal, image quality correction, and conversion into a luminance / color difference signal.
- the image processing unit 82 performs compression encoding / decompression decoding processing of an image signal based on a predetermined image data format, conversion processing of data specifications such as resolution, and the like.
- the display unit 83 has a function of displaying various data such as an operation state of the user operation unit 202 and a photographed image.
- the imaging apparatus 100 may not be provided with the display unit 83, and may be configured such that the captured image data is sent to another display apparatus and an image is displayed.
- the R / W 84 writes the image data encoded by the image processing unit 82 into the memory 90 and reads out the image data recorded in the memory 90.
- the CPU 85 functions as a control processing unit that controls each circuit block provided in the imaging apparatus 100 and controls each circuit block based on an instruction input signal from the operation unit 202.
- the operation unit 202 outputs an instruction input signal corresponding to the operation by the user to the CPU 85.
- the lens drive control unit 86 controls a drive source (ultrasonic motor 5) that moves the lens 32 based on a control signal from the CPU 85.
- the memory 90 is a semiconductor memory that can be attached to and detached from a slot connected to the R / W 84, for example.
- the shot image signal is output to the display unit 83 via the camera signal processing unit 81 and displayed as a camera through image.
- the CPU 85 outputs a control signal to the lens drive control unit 86, and the lens 32 is moved based on the control of the lens drive control unit 86.
- the photographed image signal is output from the camera signal processing unit 81 to the image processing unit 82, subjected to compression coding processing, and converted into digital data having a predetermined data format. Converted. The converted data is output to the R / W 84 and written into the memory 90.
- predetermined image data is read from the memory 90 by the R / W 84 in accordance with an operation on the operation unit 202, and decompression decoding processing is performed by the image processing unit 82. After being performed, the reproduction image signal is output to the display unit 83 to display the reproduction image.
- the urging force in the axial direction is applied to the ultrasonic motor 5, the rotary driving body 3, and the bearing 4 in the optical element driving device 1.
- a pressure spring 27 is provided. The pressure spring 27 biases the rotor 23 and the stator 22 in contact with each other and biases the rotary drive body 3 and the bearing 4 in contact with each other.
- the urging force in the direction in which the rotor 23 and the stator 22 are in contact with the ultrasonic motor 5 is applied from the pressure spring 27 and the direction in which both are in contact with the rotary drive body 3 or the bearing 4 from the pressure spring 27. Therefore, a smooth rotation state of the rotary drive body 3 such as a cam ring can be ensured with a simple structure without deteriorating the characteristics of the ultrasonic motor 5.
- a linearly-moving fixed ring 2 that guides the lens 32 as an optical element in the axial direction (optical axis direction) is provided, and the linearly-moving fixed ring 2 has a bearing 4 that is urged by a pressure spring 27 in the axial direction.
- a receiving part 7 for receiving the rotary drive 3 is provided.
- the straight traveling fixed ring 2 functions as a guide member for guiding the lens 32 and functions as a receiving member for receiving the bearing 4 or the rotary drive body 3, it is not necessary to provide the guide member and the receiving member separately, and the number of parts is reduced. It is possible to reduce the manufacturing cost due to the reduction of the above.
- the configuration in which the rotor 23 and the stator 22 are urged by the pressurizing spring 27 as in the optical element driving device 1 and the rotative driving body 3 and the bearing 4 are urged in the direction is as follows. It is particularly suitable when the weight of the driver is 50 g to 500 g. Specifically, since the driven body in the optical element driving apparatus 1 is constituted by the moving frame 29, the lens 32, the urging frame 38, and the urging spring 42, the total weight of these is 50 g to 500 g. In addition, by adopting a configuration in which the pressure spring 27 is urged as described above, it is possible to ensure a smooth rotation state of the rotary drive body 3 with a simple structure without degrading the characteristics of the ultrasonic motor 5. it can.
- the rotational drive body 3, the bearing 4, the ultrasonic motor 5, and the pressure spring 27 are arranged in the order of the bearing 4, the rotary drive body 3, the ultrasonic motor 5, and the pressure spring 27 from the front side. (See the top row in FIG. 12).
- any configuration may be used as long as the rotor 23 and the stator 22 are urged by the pressurizing spring 27 and the rotative driving body 3 and the bearing 4 are urged. Therefore, as shown in order from the upper side in the example below the uppermost stage in FIG. 12, the pressure spring 27, the bearing 4, the rotary drive body 3, and the ultrasonic motor 5 may be arranged in this order from the front side.
- the bearing 4, the rotary drive body 3, the pressure spring 27, and the ultrasonic motor 5 may be arranged in this order.
- the pressure spring 27, the ultrasonic motor 5, the rotary drive body 3, and the bearing 4 are arranged in this order from the front side.
- the ultrasonic motor 5, the rotary drive body 3, the bearing 4, and the pressure spring 27 may be arranged in this order from the front side, and the ultrasonic motor 5, the pressure spring 27, and the rotary drive body from the front side. 3 and the bearing 4 may be arranged in this order.
- the optical element is not limited to the lens 32, and examples of the optical element include a diaphragm, an iris, and an imaging element. Etc. may be used.
- the present technology may be configured as follows.
- An ultrasonic motor having a rotor and a stator; A rotary driving body that rotates around the axis by the driving force of the ultrasonic motor and moves the optical element in the axial direction; A bearing rotatable around the axis; A pressure spring that applies an urging force in the axial direction to the ultrasonic motor, the rotary drive body, and the bearing; An optical element driving device that is biased in a direction in which the rotor and the stator are in contact with each other by the pressurizing spring and in a direction in which the rotary driving body and the bearing are in contact with each other.
- a straight advancing ring for guiding the optical element in the axial direction is provided;
- a cam ring having a cam groove is used as the rotational drive body, A moving frame for holding the optical element having a cam pin slidably engaged with the cam groove;
- the optical element driving device according to any one of (1) to (3), wherein the cam groove is formed in a concave shape by a wall surface having a bottom surface.
- An urging frame that is spaced apart from the moving frame in the axial direction and supported by the cam ring is provided;
- a retracting portion having a groove width larger than other portions is formed at least at one end of the cam groove,
- the optical element driving device according to any one of (4) to (7), wherein the cam pin is positioned in the retracting portion when the optical element is not used.
- a rotation position detection sensor for detecting a rotation position of the cam ring and a movement position detection sensor for detecting a movement position of the moving frame;
- the optical element driving device according to any one of (4) to (8), wherein position information of the optical element is calculated based on detection results of the rotational position detection sensor and the movement position detection sensor.
- An optical element driving device for driving the optical element is arranged inside the cylindrical outer casing,
- the optical element driving device includes: An ultrasonic motor having a rotor and a stator; A rotary driving body that is rotated in the axial direction by the driving force of the ultrasonic motor and moves the optical element in the axial direction; A bearing rotatable around the axis; A pressure spring that applies an urging force in the axial direction to the ultrasonic motor, the rotary drive body, and the bearing; An interchangeable lens that is biased in a direction in which the rotor and the stator are in contact with each other by the pressurizing spring and in a direction in which the rotary drive body and the bearing are in contact with each other.
- a straight advancing ring for guiding the optical element in the axial direction is provided;
- a cam ring having a cam groove is used as the rotational drive body, A moving frame for holding the optical element having a cam pin slidably engaged with the cam groove;
- the interchangeable lens according to any one of (10) to (12), wherein the cam groove is formed in a concave shape by a wall surface having a bottom surface.
- An urging frame that is spaced apart from the moving frame in the axial direction and supported by the cam ring is provided;
- a retracting portion having a groove width larger than other portions is formed at least at one end of the cam groove,
- a rotation position detection sensor for detecting a rotation position of the cam ring and a movement position detection sensor for detecting a movement position of the moving frame;
- the interchangeable lens according to any one of (13) to (17), wherein position information of the optical element is calculated based on detection results of the rotational position detection sensor and the movement position detection sensor.
- a movement position detection sensor for detecting a movement position of the movement frame and a detection sheet are provided;
- the movement position detection sensor and the detection sheet are arranged in a positional relationship in which the movement frame overlaps each other in a direction perpendicular to the optical axis in the entire movement region in which the movement frame moves in the optical axis direction.
- An optical element driving device that drives the optical element, and an imaging element that converts an optical image captured via the photographing optical system into an electrical signal
- the optical element driving device includes: An ultrasonic motor having a rotor and a stator; A rotary driving body that is rotated in the axial direction by the driving force of the ultrasonic motor and moves the optical element in the axial direction; A bearing rotatable around the axis; A pressure spring that applies an urging force in the axial direction to the ultrasonic motor, the rotary drive body, and the bearing; The imaging device urged by the pressure spring in a direction in which the rotor and the stator are in contact with each other and in a direction in which the rotary drive body and the bearing are in contact with each other.
- DESCRIPTION OF SYMBOLS 100 ... Image pick-up device, 204 ... Image pick-up element, 300 ... Interchangeable lens, 1 ... Optical element drive device, 2 ... Straightening fixed ring, 3 ... Rotation drive body, 4 ... Bearing, 5 ... Ultrasonic motor, 7 ... Reception part, DESCRIPTION OF SYMBOLS 9 ... Movement position detection sensor, 13 ... Cam groove, 13a ... Bottom, 15 ... Retraction part, 22 ... Stator, 23 ... Rotor, 27 ... Pressure spring, 29 ... Moving frame, 31 ... Cam pin, 32 ... Lens (optical element) 34... Bearing portion 35. Bearing portion 38. Energizing frame 41 Engaging pin 42 Energizing spring 44.
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Abstract
Description
撮像装置100は装置本体200と交換レンズ300によって構成されている(図1参照)。尚、本技術は、装置本体の内部に交換レンズ300の内部構造と同様の構造を有するレンズ鏡筒が組み込まれたタイプやこのレンズ鏡筒が装置本体に対して突出又は収納される沈胴タイプにも適用することが可能である。
交換レンズ300は、例えば、デジタル一眼レフカメラ用の交換レンズである。
以下に、交換レンズ300における動作の概略について説明する。
図11に、本技術撮像装置の一実施形態のブロック図を示す。
以上に記載した通り、光学素子駆動装置1、交換レンズ300及び撮像装置100にあっては、光学素子駆動装置1に超音波モーター5と回転駆動体3とベアリング4に軸方向への付勢力を付与する加圧バネ27が設けられ、加圧バネ27によってローター23とステーター22が接する方向へ付勢されると共に回転駆動体3とベアリング4が接する方向へ付勢されている。
上記には、回転駆動体3とベアリング4と超音波モーター5と加圧バネ27の並び順が前側からベアリング4、回転駆動体3、超音波モーター5、加圧バネ27の順にされている例を示した(図12の最上段参照)。
本技術は、以下のような構成にすることもできる。
ローターとステーターを有する超音波モーターと、
前記超音波モーターの駆動力によって軸回り方向へ回転され光学素子を軸方向へ移動させる回転駆動体と、
前記軸回り方向へ回転可能なベアリングと、
前記超音波モーターと前記回転駆動体と前記ベアリングに前記軸方向への付勢力を付与する加圧バネとを備え、
前記加圧バネによって前記ローターと前記ステーターが接する方向へ付勢されると共に前記回転駆動体と前記ベアリングが接する方向へ付勢された
光学素子駆動装置。
前記光学素子を前記軸方向へ案内する直進用固定環が設けられ、
前記直進用固定環には前記軸方向において前記加圧バネによって付勢された前記ベアリング又は前記回転駆動体を受ける受部が設けられた
前記(1)に記載の光学素子駆動装置。
前記加圧バネが環状に形成された
前記(1)又は前記(2)に記載の光学素子駆動装置。
前記回転駆動体としてカム溝を有するカム環が用いられ、
前記カム溝に摺動自在に係合されるカムピンを有し前記光学素子を保持する移動枠が設けられ、
前記カム溝が底面を有する壁面によって凹状に形成された
前記(1)から前記(3)の何れかに記載の光学素子駆動装置。
前記カムピンには前記カム溝に対して回転可能なベアリング部が設けられた
前記(4)に記載の光学素子駆動装置。
前記移動枠と前記軸方向に離隔して位置され前記カム環に支持された付勢枠が設けられ、
前記移動枠と前記付勢枠を前記軸方向において互いに離隔する方向又は互いに接近する方向へ付勢する付勢バネが設けられた
前記(4)又は前記(5)に記載の光学素子駆動装置。
前記付勢枠には前記カム溝に摺動自在に係合される係合ピンが設けられた
前記(6)に記載の光学素子駆動装置。
前記カム溝の少なくとも一端部に他の部分より溝幅の大きい退避部が形成され、
前記光学素子の不使用状態において前記カムピンが前記退避部に位置される
前記(4)から前記(7)の何れかに記載の光学素子駆動装置。
前記カム環の回転位置を検出する回転位置検出センサーと前記移動枠の移動位置を検出する移動位置検出センサーとが設けられ、
前記回転位置検出センサーと前記移動位置検出センサーの検出結果に基づいて前記光学素子の位置情報が算出される
前記(4)から前記(8)の何れかに記載の光学素子駆動装置。
筒状の外筐の内部に光学素子の駆動を行う光学素子駆動装置が配置され、
前記光学素子駆動装置は、
ローターとステーターを有する超音波モーターと、
前記超音波モーターの駆動力によって軸回り方向へ回転され前記光学素子を軸方向へ移動させる回転駆動体と、
前記軸回り方向へ回転可能なベアリングと、
前記超音波モーターと前記回転駆動体と前記ベアリングに前記軸方向への付勢力を付与する加圧バネとを備え、
前記加圧バネによって前記ローターと前記ステーターが接する方向へ付勢されると共に前記回転駆動体と前記ベアリングが接する方向へ付勢された
交換レンズ。
前記光学素子を前記軸方向へ案内する直進用固定環が設けられ、
前記直進用固定環には前記軸方向において前記加圧バネによって付勢された前記ベアリング又は前記回転駆動体を受ける受部が設けられた
前記(10)に記載の交換レンズ。
前記加圧バネが環状に形成された
前記(10)又は前記(11)に記載の交換レンズ。
前記回転駆動体としてカム溝を有するカム環が用いられ、
前記カム溝に摺動自在に係合されるカムピンを有し前記光学素子を保持する移動枠が設けられ、
前記カム溝が底面を有する壁面によって凹状に形成された
前記(10)から前記(12)の何れかに記載の交換レンズ。
前記カムピンには前記カム溝に対して回転可能なベアリング部が設けられた
前記(13)に記載の交換レンズ。
前記移動枠と前記軸方向に離隔して位置され前記カム環に支持された付勢枠が設けられ、
前記移動枠と前記付勢枠を前記軸方向において互いに離隔する方向又は互いに接近する方向へ付勢する付勢バネが設けられた
前記(13)又は前記(14)に記載の交換レンズ。
前記付勢枠には前記カム溝に摺動自在に係合される係合ピンが設けられた
前記(15)に記載の交換レンズ。
前記カム溝の少なくとも一端部に他の部分より溝幅の大きい退避部が形成され、
前記光学素子の不使用状態において前記カムピンが前記退避部に位置される
前記(13)から前記(16)の何れかに記載の交換レンズ。
前記カム環の回転位置を検出する回転位置検出センサーと前記移動枠の移動位置を検出する移動位置検出センサーとが設けられ、
前記回転位置検出センサーと前記移動位置検出センサーの検出結果に基づいて前記光学素子の位置情報が算出される
前記(13)から前記(17)の何れかに記載の交換レンズ。
前記移動枠の移動位置を検出する移動位置検出センサーと検出シートが設けられ、
前記移動位置検出センサーと検出シートは、前記移動枠が光軸方向へ移動する全移動領域において光軸に垂直な方向で互いに重なる位置関係で配置される
前記(10)から前記(18)の何れかに記載の交換レンズ。
光学素子の駆動を行う光学素子駆動装置と撮影光学系を介して取り込まれた光学像を電気的信号に変換する撮像素子とを備え、
前記光学素子駆動装置は、
ローターとステーターを有する超音波モーターと、
前記超音波モーターの駆動力によって軸回り方向へ回転され前記光学素子を軸方向へ移動させる回転駆動体と、
前記軸回り方向へ回転可能なベアリングと、
前記超音波モーターと前記回転駆動体と前記ベアリングに前記軸方向への付勢力を付与する加圧バネとを備え、
前記加圧バネによって前記ローターと前記ステーターが接する方向へ付勢されると共に前記回転駆動体と前記ベアリングが接する方向へ付勢された
撮像装置。
Claims (20)
- ローターとステーターを有する超音波モーターと、
前記超音波モーターの駆動力によって軸回り方向へ回転され光学素子を軸方向へ移動させる回転駆動体と、
前記軸回り方向へ回転可能なベアリングと、
前記超音波モーターと前記回転駆動体と前記ベアリングに前記軸方向への付勢力を付与する加圧バネとを備え、
前記加圧バネによって前記ローターと前記ステーターが接する方向へ付勢されると共に前記回転駆動体と前記ベアリングが接する方向へ付勢された
光学素子駆動装置。 - 前記光学素子を前記軸方向へ案内する直進用固定環が設けられ、
前記直進用固定環には前記軸方向において前記加圧バネによって付勢された前記ベアリング又は前記回転駆動体を受ける受部が設けられた
請求項1に記載の光学素子駆動装置。 - 前記加圧バネが環状に形成された
請求項1に記載の光学素子駆動装置。 - 前記回転駆動体としてカム溝を有するカム環が用いられ、
前記カム溝に摺動自在に係合されるカムピンを有し前記光学素子を保持する移動枠が設けられ、
前記カム溝が底面を有する壁面によって凹状に形成された
請求項1に記載の光学素子駆動装置。 - 前記カムピンには前記カム溝に対して回転可能なベアリング部が設けられた
請求項4に記載の光学素子駆動装置。 - 前記移動枠と前記軸方向に離隔して位置され前記カム環に支持された付勢枠が設けられ、
前記移動枠と前記付勢枠を前記軸方向において互いに離隔する方向又は互いに接近する方向へ付勢する付勢バネが設けられた
請求項4に記載の光学素子駆動装置。 - 前記付勢枠には前記カム溝に摺動自在に係合される係合ピンが設けられた
請求項6に記載の光学素子駆動装置。 - 前記カム溝の少なくとも一端部に他の部分より溝幅の大きい退避部が形成され、
前記光学素子の不使用状態において前記カムピンが前記退避部に位置される
請求項4に記載の光学素子駆動装置。 - 前記カム環の回転位置を検出する回転位置検出センサーと前記移動枠の移動位置を検出する移動位置検出センサーとが設けられ、
前記回転位置検出センサーと前記移動位置検出センサーの検出結果に基づいて前記光学素子の位置情報が算出される
請求項4に記載の光学素子駆動装置。 - 筒状の外筐の内部に光学素子の駆動を行う光学素子駆動装置が配置され、
前記光学素子駆動装置は、
ローターとステーターを有する超音波モーターと、
前記超音波モーターの駆動力によって軸回り方向へ回転され前記光学素子を軸方向へ移動させる回転駆動体と、
前記軸回り方向へ回転可能なベアリングと、
前記超音波モーターと前記回転駆動体と前記ベアリングに前記軸方向への付勢力を付与する加圧バネとを備え、
前記加圧バネによって前記ローターと前記ステーターが接する方向へ付勢されると共に前記回転駆動体と前記ベアリングが接する方向へ付勢された
交換レンズ。 - 前記光学素子を前記軸方向へ案内する直進用固定環が設けられ、
前記直進用固定環には前記軸方向において前記加圧バネによって付勢された前記ベアリング又は前記回転駆動体を受ける受部が設けられた
請求項10に記載の交換レンズ。 - 前記加圧バネが環状に形成された
請求項10に記載の交換レンズ。 - 前記回転駆動体としてカム溝を有するカム環が用いられ、
前記カム溝に摺動自在に係合されるカムピンを有し前記光学素子を保持する移動枠が設けられ、
前記カム溝が底面を有する壁面によって凹状に形成された
請求項10に記載の交換レンズ。 - 前記カムピンには前記カム溝に対して回転可能なベアリング部が設けられた
請求項13に記載の交換レンズ。 - 前記移動枠と前記軸方向に離隔して位置され前記カム環に支持された付勢枠が設けられ、
前記移動枠と前記付勢枠を前記軸方向において互いに離隔する方向又は互いに接近する方向へ付勢する付勢バネが設けられた
請求項13に記載の交換レンズ。 - 前記付勢枠には前記カム溝に摺動自在に係合される係合ピンが設けられた
請求項15に記載の交換レンズ。 - 前記カム溝の少なくとも一端部に他の部分より溝幅の大きい退避部が形成され、
前記光学素子の不使用状態において前記カムピンが前記退避部に位置される
請求項13に記載の交換レンズ。 - 前記カム環の回転位置を検出する回転位置検出センサーと前記移動枠の移動位置を検出する移動位置検出センサーとが設けられ、
前記回転位置検出センサーと前記移動位置検出センサーの検出結果に基づいて前記光学素子の位置情報が算出される
請求項13に記載の交換レンズ。 - 前記移動枠の移動位置を検出する移動位置検出センサーと検出シートが設けられ、
前記移動位置検出センサーと前記検出シートは、前記移動枠が光軸方向へ移動する全移動領域において光軸に垂直な方向で互いに重なる位置関係で配置される
請求項10に記載の交換レンズ。 - 光学素子の駆動を行う光学素子駆動装置と撮影光学系を介して取り込まれた光学像を電気的信号に変換する撮像素子とを備え、
前記光学素子駆動装置は、
ローターとステーターを有する超音波モーターと、
前記超音波モーターの駆動力によって軸回り方向へ回転され前記光学素子を軸方向へ移動させる回転駆動体と、
前記軸回り方向へ回転可能なベアリングと、
前記超音波モーターと前記回転駆動体と前記ベアリングに前記軸方向への付勢力を付与する加圧バネとを備え、
前記加圧バネによって前記ローターと前記ステーターが接する方向へ付勢されると共に前記回転駆動体と前記ベアリングが接する方向へ付勢された
撮像装置。
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JP2017565423A JP6809486B2 (ja) | 2016-02-02 | 2016-12-14 | 光学素子駆動装置、交換レンズ及び撮像装置 |
US16/070,399 US20190033687A1 (en) | 2016-02-02 | 2016-12-14 | Optical-device drive apparatus, interchangeable lens, and imaging apparatus |
KR1020187021942A KR20180107122A (ko) | 2016-02-02 | 2016-12-14 | 광학 소자 구동 장치, 교환 렌즈 및 촬상 장치 |
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US10090550B2 (en) | 2016-04-15 | 2018-10-02 | Standard Energy Co., Ltd. | Redox flow battery |
CN110737158A (zh) * | 2018-07-20 | 2020-01-31 | 卡尔蔡司股份公司 | 物镜的物镜基体、物镜的外壳体、物镜***和物镜组件 |
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CN109633915A (zh) * | 2018-12-25 | 2019-04-16 | 南京航空航天大学 | 一种中空超声电机驱动的自动变倍激光扩束镜 |
CN110261983B (zh) * | 2019-06-04 | 2021-09-03 | 贵州倍易通科技有限公司 | 一种用于相机镜头的驱动装置 |
JP7289733B2 (ja) * | 2019-06-20 | 2023-06-12 | キヤノン株式会社 | 位置検出装置 |
CN110646912A (zh) * | 2019-09-26 | 2020-01-03 | 华为技术有限公司 | 镜头模组和虚拟现实设备 |
CN113467038B (zh) * | 2021-09-04 | 2022-02-18 | 新思考电机有限公司 | 透镜驱动装置的转筒驱动机构、方法、透镜驱动装置及摄像装置 |
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