WO2014097945A1 - 音叉型水晶振動片 - Google Patents
音叉型水晶振動片 Download PDFInfo
- Publication number
- WO2014097945A1 WO2014097945A1 PCT/JP2013/083243 JP2013083243W WO2014097945A1 WO 2014097945 A1 WO2014097945 A1 WO 2014097945A1 JP 2013083243 W JP2013083243 W JP 2013083243W WO 2014097945 A1 WO2014097945 A1 WO 2014097945A1
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- WIPO (PCT)
- Prior art keywords
- groove
- leg
- vibrating piece
- width direction
- crystal vibrating
- Prior art date
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- 239000010453 quartz Substances 0.000 title abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title abstract description 28
- 239000013078 crystal Substances 0.000 claims abstract description 129
- 230000005284 excitation Effects 0.000 description 38
- 238000000605 extraction Methods 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003566 sealing material Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/21—Crystal tuning forks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02062—Details relating to the vibration mode
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02157—Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
- H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
- H03H9/1021—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device the BAW device being of the cantilever type
Definitions
- the present invention relates to a tuning fork type crystal vibrating piece.
- a tuning fork type quartz crystal vibrating piece including a base and two legs protruding from the base (for example, see Patent Document 1).
- a pair of excitation electrodes configured with different potentials are formed on two legs, and concave grooves are formed on both main surfaces of the two legs.
- a tuning fork type crystal vibrating device is configured by hermetically sealing the tuning fork type crystal vibrating piece in an internal space of a main body housing constituted by a base and a lid (see, for example, Patent Document 1).
- the substrate of the tuning fork type quartz vibrating piece has a crystal orientation.
- the inner surfaces of the groove portions formed on both main surfaces of the leg portions cannot form all the side surfaces at right angles to the main surfaces (one main surface and the other main surface), and at least some of the side surfaces are the main surfaces.
- the inclined surface has an inclination with respect to the surface.
- the substrate since the substrate has a crystal orientation, the angles of the inclined surfaces of the plurality of opposing side surfaces in the groove portion are different, and the inner surface shape of the groove portion is not symmetrical.
- a pair of groove part does not become a symmetrical shape also regarding a pair of groove part formed in both the main surfaces of each leg part.
- an object of the present invention is to provide a tuning fork type crystal resonator capable of suppressing the influence of the characteristics due to the shape of the groove formed in the leg.
- a tuning-fork type crystal vibrating piece is made of a crystal piece having a crystal orientation, and is provided with a base and a pair of legs protruding in one direction from the base.
- a groove portion is formed to be deviated with respect to the center in the width direction of the leg portion.
- the lowest point of the groove portion is the width direction in the width direction. It is located in the center of the groove part.
- biased means that the groove is formed so as to be biased with respect to the center in the width direction of the leg, and the distance from the groove (inner surface of the groove) to both side surfaces of the leg. (The dimension of the bank formed in the main surface of a leg part) should not be the same.
- the “center” here is not strictly limited to the center position of the groove portion (specifically, the center position of the groove portion in the width direction). That is, even if the lowest point of the groove portion is slightly displaced from the center due to a manufacturing error, the same effect (see below) is obtained. That is, the center position shift due to manufacturing variations is within the scope of the present invention.
- the tuning-fork type crystal vibrating piece is formed of a crystal piece, and the inner surfaces of the groove portions formed on both main surfaces of the leg portion are formed at right angles with respect to the main surface. Can not. Even if it is this structure, it can be set as the structure effective in maintaining the weight balance of each said leg part by forming the said groove part offset with respect to the center of the said width direction of the said leg part. .
- the groove portion is formed to be deviated with respect to the center of the leg portion in the width direction, and the groove portion has an outermost shape of the groove portion in the end face shape in the width direction.
- the lower point is located at the center of the groove in the width direction. According to this configuration, the lowest point of the groove portion is located at the center of the groove portion in the width direction, and thus the crystal piece is formed, and the groove portion is biased with respect to the center of the leg portion in the width direction. Further, weight correction can be performed on the formed configuration so as to maintain a weight balance.
- the side surface including the plurality of surfaces of the groove portion has an inclined surface, and the angle of the inclined surface of the side surface (the plurality of surfaces) is different. Therefore, although the weight balance of the leg portion is lost by forming the groove portion, according to the present invention, in the groove portion, the lowest point of the groove portion is the width in the end face shape in the width direction.
- the leg portion is formed of a crystal piece, and the groove portion is formed so as to be deviated with respect to the center of the leg portion in the width direction.
- the groove portion is formed so as to be deviated with respect to the center of the leg portion in the width direction.
- the right and left weights in the width direction of the leg portion by biasing the position of the groove portion with respect to the center in the width direction of the leg portion. Furthermore, in the groove part, in the shape of the end face in the width direction, the lowest point of the groove part is located at the center of the groove part in the width direction, so that the angle difference between the slopes of the side surfaces (plural faces) can be reduced. It becomes possible. As a result, the weight balance is improved. On the other hand, in the conventional tuning-fork type crystal vibrating piece, the left and right slope angles in the leg are greatly different, so the vertical vibration of the leg is different on the left and right, and the weight balance is lost.
- each leg portion has a groove
- other vibration modes longitudinal vibration mode, etc.
- the lowest point or bottom surface of the groove is formed so as to be largely offset with respect to the center in the width direction of the leg, and the inner surface (side surface) of the groove is The inclined surface is inclined with respect to the main surface.
- the groove portion in each of the leg portions, is formed to be deviated with respect to the center in the width direction, and the groove portion has the groove portion in the shape of the end view in the width direction. Since the lowest point of is located at the center in the width direction, the shape of the side surface of the inner surface of the groove portion can be made symmetrical or close to symmetry in the end face shape in the width direction. Further, one or more inclined surfaces of the inner surface of the groove portion can be reduced as compared with the conventional tuning fork type quartz vibrating piece.
- the package size of a piezoelectric vibration device such as a crystal resonator or an oscillator on which a tuning fork type crystal resonator element is mounted is currently tending to be small (for example, package size: 2.0 mm ⁇ 1.2 mm or less). Accordingly, the inventor has confirmed that spurious vibrations are generated in the vibration of the tuning fork type crystal vibrating piece. On the other hand, the tuning fork type quartz crystal vibrating piece has hardly generated spurious noise and has not been considered to suppress spurious vibration. However, it is necessary to consider suppressing the spurious for the current small tuning fork type crystal vibrating piece. .
- the present invention it is possible to suppress the spurious by reducing the slope of the side surface of the groove or reducing the difference between the slopes.
- the present invention is a small tuning fork type. Ideal for quartz crystal vibrating pieces. It is also possible to prevent the frequency value (main vibration value) oscillating due to spurious generation from changing.
- a groove portion on one main surface side and a groove portion on the other main surface side are respectively formed on both main surfaces of the leg portion, and the protruding direction is formed between the groove portion on the one main surface side and the groove portion on the other main surface side.
- the lowermost point may be at the opposite position.
- FIG. 1 is a diagram showing the inside of a tuning fork type crystal resonator according to the first embodiment, and is a schematic plan view of a base on which a tuning fork type crystal vibrating piece is mounted.
- FIG. 2 is an end view taken along line AA of the quartz crystal vibrating piece shown in FIG.
- FIG. 3 is a schematic plan view of a groove formed in the first leg of the tuning fork type crystal vibrating piece according to the first embodiment.
- FIG. 4 is a schematic rear view of the groove formed in the first leg of the tuning fork type crystal vibrating piece according to the first embodiment.
- FIG. 5 is an end view taken along the line BB shown in FIGS.
- FIG. 6 is a view corresponding to FIG.
- FIG. 7 is a view corresponding to FIG. 4 on the base side of the groove formed on the other main surface, showing a conventional crystal vibrating piece on FIG. 7 and according to the present embodiment below FIG.
- a crystal vibrating piece is shown.
- FIG. 8 is a view corresponding to FIG. 3 on the adjustment unit side of the groove formed on one main surface, showing a conventional crystal vibrating piece on the top of FIG. Such a crystal vibrating piece is shown.
- FIG. 9 is a view corresponding to FIG.
- FIG. 10 is a diagram of the adjustment portion side of the groove corresponding to FIG. 5, and shows a conventional crystal resonator element on the top of FIG. 10, and a crystal resonator element according to the present embodiment on the bottom of FIG. 10.
- FIG. 11 is a diagram of the adjustment portion side of the groove corresponding to FIG. 5, and shows a conventional crystal resonator element on the top of FIG. 11, and a crystal resonator element according to the present embodiment on the bottom of FIG. 11.
- FIG. 12 is a schematic plan view of a tuning-fork type crystal vibrating piece according to another embodiment.
- the present invention is not limited to a tuning fork type crystal resonator, and may be a tuning fork type crystal vibrating device provided with a tuning fork type crystal vibrating piece. It may be an oscillator.
- a tuning fork type crystal resonator 1 (hereinafter referred to as a crystal resonator) according to the present embodiment includes a tuning fork type crystal resonator element 2 (hereinafter referred to as a crystal resonator element) formed by photolithography as shown in FIG. And a base 3 on which the crystal vibrating piece 2 is mounted, and a lid (not shown) for hermetically sealing the crystal vibrating piece 2 mounted (held) on the base 3 in the main body housing. Yes.
- a base 3 and a lid are joined to form a main body casing. Specifically, the base 3 and the lid are joined via a sealing material (not shown), and the interior space 11 of the main body housing is formed by this joining.
- the crystal vibrating piece 2 is held and joined to the base 3 in the internal space 11 of the main body casing via the conductive bumps 12, and the inner space 11 of the main body casing is hermetically sealed. .
- the crystal vibrating piece 2 is ultrasonically bonded to the base 3 by an FCB (Flip Chip Bonding) method using conductive bumps 12 made of a metal material (for example, gold).
- FCB Flip Chip Bonding
- the base 3 is formed in a box-like body composed of a bottom portion 31 and a bank portion 32 extending upward from the bottom portion 31. Further, the bank portion 32 is formed by laminating two layers, and a step portion 33 is provided in the internal space 11.
- the base 3 is formed by laminating a rectangular parallelepiped of a ceramic material on a single plate having a rectangular shape in a plan view made of a ceramic material, and integrally firing in a concave shape.
- the bank part 32 is shape
- a metallized layer 34 (a part of the sealing material) for bonding to the lid is provided on the upper surface of the bank portion 32.
- the metallized layer 34 has, for example, a structure in which nickel and gold are plated in this order on a tungsten layer or a molybdenum layer.
- a stepped portion 33 is formed at one end portion in the longitudinal direction and a part of the end portion along the longitudinal direction in the internal space 11. .
- a pair of electrode pads 35 is formed at one end of the stepped portion 33 in the longitudinal direction, and the crystal vibrating piece 2 is mounted and held on these electrode pads 35.
- These electrode pads 35 are electrically connected to terminal electrodes (not shown) formed on the back surface of the base 3 through corresponding routing electrodes (not shown), and the terminal electrodes are connected to external parts or external parts. Connected to the external electrode of the device.
- the electrode pad 35, the lead electrode, and the terminal electrode are formed by printing a metallized material such as tungsten or molybdenum and then firing it integrally with the base 3.
- a part of the electrode pad 35, the routing electrode, and the terminal electrode is formed by forming nickel plating on the metallized upper portion and forming gold plating on the upper portion thereof.
- the lid is made of, for example, a metal material and formed into a single plate having a rectangular shape in plan view. A part of the sealing material is formed on the lower surface of the lid.
- This lid is joined to the base 3 via a sealing material by a technique such as seam welding, beam welding, heat fusion joining, etc., and thereby the main body housing of the crystal unit 1 is constituted by the lid and the base 3. .
- the crystal vibrating piece 2 is a crystal piece formed from a crystal wafer (not shown) made of a crystal Z plate made of anisotropic material having crystal orientation.
- the external shape of the substrate of the quartz crystal resonator element 2 is collectively (integrally) formed by, for example, wet etching using a resist or a metal film as a mask, using a photolithography technique (photolithographic method).
- the substrate of the quartz crystal resonator element 2 includes a pair of leg portions 41 and 42 (first leg portion 41 and second leg portion 42) that are vibration portions, a first leg portion 41 and The second leg portion 42 has an outer shape including the base portion 5 provided so as to protrude from the one end surface 51.
- the base portion 5 has a left-right symmetrical shape in plan view and is formed wider than the first leg portion 41 and the second leg portion 42. Further, the vicinity of the one end surface 51 of the base 5 is formed so as to gradually increase from the one end surface 51 side to the other end surface 52 side.
- the base 5 is provided with two joint locations 53 that are joined to the electrode pads 35 of the base 3 via the conductive bumps 12.
- the joint locations 53 are provided in the vicinity of both ends of the other main surface 22 of the base 5.
- the pair of leg portions 41 and 42 protrude from one end surface 51 of the base portion 5 and are juxtaposed via the gap portion 23.
- the gap part 23 here is provided in the center position (central region) in the width direction of the one end face 51.
- leg portions 41 and 42 are connected to an excitation portion 43 protruding from one end surface 51 of the base portion 5 and a distal end portion 431 of the excitation portion 43, respectively, and the protruding direction of the excitation portion 43 (Y shown in FIG. 1). And an adjusting portion 44 extending in the axial direction.
- both main surfaces 21 and 22 (one main surface 21 and the other main surface 22) of the excitation unit 43 are provided with one
- the groove portion 45 on the main surface 21 side and the groove portion 45 on the other main surface 22 side are formed so as to be offset with respect to the centers of the leg portions 41 and 42 in the width direction.
- the groove 45 on the one main surface 21 side and the groove 45 on the other main surface 22 side of the second leg 42 are the groove 45 on the one main surface 21 side and the groove 45 on the other main surface 22 side of the first leg 41. It has the same shape as Therefore, taking the first leg portion 41 shown in FIG. 1 as an example, the groove portion 45 on the one main surface 21 side and the groove portion 45 on the other main surface 22 side in the two leg portions 41 and 42 will be described in detail below.
- the groove portion 45 on the one main surface 21 side and the groove portion 45 on the other main surface 22 side formed in the first leg portion 41 are formed into a concave shape by wet etching. As shown, it is composed of a plurality of surfaces (side surfaces 452).
- the groove portion 45 on the one main surface 21 side and the groove portion 45 on the other main surface 22 side in the shape of the first leg portion 41 in the width direction (X-axis direction) shown in FIG.
- the lowermost point 453 is located at the center of the groove 45 on the one main surface 21 side
- the lowermost point 453 of the groove 45 on the other main surface 22 side is located at the center of the groove 45 on the other main surface 22 side.
- the lowest point 453 is at the opposite position, and the longitudinal length of the first leg part 41 shown in FIG.
- the shape is point-symmetric.
- the length of the lowest point 453 according to the present embodiment is longer than the length of the lowest point and the bottom surface formed on the conventional tuning fork type crystal vibrating piece. In other words, the excitation area can be expanded as compared with the conventional tuning-fork type crystal vibrating piece.
- the end face view shape in the width direction (X-axis direction shown in FIG. 1) of the first leg portion 41 and the second leg portion 42 is substantially H-shaped, and the first leg portion A groove 45 is formed in each of the 41 and second leg portions 42 so as to be offset from the center of the first leg portion 41 and the second leg portion 42 in the width direction (X-axis direction).
- “biased” here means that the groove 45 is formed so as to be offset with respect to the center of the first leg 41 and the second leg 42 in the width direction (X-axis direction).
- the size of the bank formed on the other main surface 22) may not be completely the same.
- the groove 45 has a first inclined surface 46 and a second inclined surface 47 across the lowest point 453 in the width direction (X-axis direction) of the first leg portion 41 and the second leg portion 42 shown in FIG.
- An inner surface 451 is formed.
- the ratio R of the width dimension of the first inclined surface 46 to the width dimension of the second inclined surface 47 is 1 ⁇ R ⁇ 1.3, and the width dimension of the first inclined surface 46 in the width direction is 1 ⁇ R ⁇ 1.3.
- the width dimension of the second inclined surface 47 in the width direction are the same (including substantially the same).
- the width direction width of the second inclined surface 47 and the width direction width of the first inclined surface 46 are 50:50 to 47:53 (47:53 in FIG. 2).
- the specific width dimensions of the first inclined surface 46 and the second inclined surface 47 are, for example, 22.3 and 19.7 ⁇ m, respectively.
- the lowest point 453 of the groove portion 45 is the groove portion 45 in the end face shape in the X-axis direction shown in FIG. Located in the center of.
- the “center” here is not strictly limited to the center position of the groove portion 45 (specifically, the center position of the groove portion 45 in the X-axis direction). Even if the lowermost point 453 of the center has a slight misalignment (R ⁇ 1.3) from the center, it has the same effect (see below) as the present embodiment. This is a category of the embodiment.
- the adjustment portion 44 is formed to have the same width as the tip surface of the tip portion 431 of the excitation portion 43 so as to extend continuously with the tip portion 431 of the excitation portion 43.
- the tip end corner of the adjustment portion 44 is formed in a curved surface, thereby preventing contact with the bank portion 32 of the base 3 when receiving an external force.
- the tip end corner in the protruding direction of the adjustment portion 44 is formed in a curved surface, but the present invention is not limited to this, and may be formed in a taper.
- the first excitation electrode 61 and the second excitation electrode 62 configured with different potentials, and the first excitation electrode 61 and the second excitation electrode 62 are connected to the electrode pad 35 of the base 3.
- Lead electrodes 63 and 64 led from the first excitation electrode 61 and the second excitation electrode 62 are formed to be electrically joined to each other.
- Part of the first excitation electrode 61 and the second excitation electrode 62 is formed inside (inner surface) of the groove 45. For this reason, even if the crystal vibrating piece 2 is reduced in size, vibration loss of the first leg portion 41 and the second leg portion 42 is suppressed, and the CI value can be kept low.
- the first excitation electrode 61 is formed on both main surfaces 21 and 22 of the excitation portion 43 of the first leg portion 41 and both side surfaces 421 (both side surfaces 421) of the excitation portion 43 of the second leg portion 42.
- the second excitation electrode 62 is formed on both main surfaces 21 and 22 of the excitation portion 43 of the second leg portion 42 and on both side surfaces 411 (both side surfaces 411) of the excitation portion 43 of the first leg portion 41. Has been.
- the extraction electrodes 63 and 64 are formed on the base portion 5 and the adjusting portion 44 of the two leg portions 41 and 42 (the first leg portion 41 and the second leg portion 42). Specifically, the first excitation electrode 61 formed on both main surfaces 21 and 22 of the excitation portion 43 of the first leg portion 41 is excited by the extraction electrode 63 formed on the base portion 5. The first excitation electrode 61 formed on both side surfaces 421 (both side surfaces 421) of the portion 43 is connected.
- the first excitation electrode 61 formed on both side surfaces 421 (both side surfaces 421) of the excitation portion 43 of the second leg portion 42 is one end portion of the adjustment portion 44 of the second leg portion 42 on the excitation portion 43 side.
- the second excitation electrode 62 formed on both main surfaces 21 and 22 of the excitation portion 43 of the second leg portion 42 by the extraction electrode 64 formed on the base portion 5 causes the excitation portion 43 of the first leg portion 41 to be excited.
- the frequency adjusting metal film used for frequency adjustment of the crystal vibrating piece 2 is provided on the tip side of the one end portion where the extraction electrodes 63 and 64 are formed. 7 is formed.
- the boundary between the formation region of the extraction electrodes 63 and 64 and the formation region of the frequency adjusting metal film 7 in the adjustment unit 44 is indicated by a broken line.
- FIG. 6 is a view corresponding to FIG. 3 on the base 5 side of the groove 45 formed on one main surface 21.
- a conventional crystal vibrating piece is shown above FIG. 6, and this embodiment is shown below FIG.
- the crystal vibrating piece 2 concerning a form is shown.
- FIG. 7 is a view corresponding to FIG. 4 on the base 5 side of the groove 45 formed on the other main surface 22, and shows a conventional crystal vibrating piece on the top of FIG.
- the crystal vibrating piece 2 concerning a form is shown.
- FIG. 8 is a view corresponding to FIG. 3 on the adjustment portion 44 side of the groove portion 45 formed on one principal surface 21.
- a conventional crystal vibrating piece is shown above FIG. 8, and this embodiment is shown below FIG.
- the crystal vibrating piece 2 concerning this form is shown.
- FIG. 8 is a view corresponding to FIG. 3 on the adjustment portion 44 side of the groove portion 45 formed on one principal surface 21.
- a conventional crystal vibrating piece is shown above FIG. 8, and this embodiment is shown below FIG.
- FIG. 9 is a view corresponding to FIG. 4 on the adjustment portion 44 side of the groove portion 45 formed on the other main surface 22, showing a conventional crystal vibrating piece on the top of FIG.
- the crystal vibrating piece 2 concerning this form is shown.
- FIG. 10 is a view of the groove 45 corresponding to FIG. 5 on the adjustment unit 44 side.
- a conventional crystal resonator element is shown above FIG. 10, and the crystal oscillator piece 2 according to the present embodiment is shown below FIG. Show.
- FIG. 11 is a diagram of the groove 45 corresponding to FIG. 5 on the adjustment unit 44 side.
- a conventional crystal vibrating piece is shown above FIG. 11, and the crystal vibrating piece 2 according to the present embodiment is shown below FIG. Show.
- the crystal vibrating piece 2 has a groove 45 on the one main surface 21 side and a groove 45 on the other main surface 22 side compared to the conventional crystal vibrating piece.
- the lowest point 453 of the groove portion 45 on the one main surface 21 side is the center in the width direction of the groove portion 45 on the one main surface 21 side.
- the lowermost point 453 of the groove 45 on the other main surface 22 side is located at the center in the width direction of the groove 45 on the other main surface 22 side.
- the quartz crystal resonator element 2 according to the present embodiment, the length of the lowest point 453 is increased and the number of side surfaces 452 is reduced with respect to the conventional quartz oscillator piece.
- the inner surface 451 of the groove portion 45 formed of the crystal piece and formed on both the main surfaces 21 and 22 of the first leg portion 41 and the second leg portion 42 has one main part. All the side surfaces 452 cannot be formed at right angles to the surface 21 (or the other main surface 22). Even in this configuration, the groove 45 is formed so as to be deviated with respect to the center in the width direction (X-axis direction) of the first leg 41 and the second leg 42, so that each first leg 41 and It can be set as the structure effective in maintaining the weight balance of the 2nd leg part 42.
- first leg portion 41 and the second leg portion are only formed so that the groove portion 45 is formed to be biased with respect to the center in the width direction (X-axis direction) of the first leg portion 41 and the second leg portion 42. It is not the best means to keep the weight balance of 42. That is, even if the first leg 41 and the second leg 42 are formed to be maximally deviated from the center in the width direction (X-axis direction), the first leg 41 and the second leg are maintained until the weight balance is maintained.
- the weight of 42 cannot be made uniform. This phenomenon is particularly related to the tendency of the quartz vibrating piece 2 to be downsized at present, and in the case of a tuning-fork type quartz vibrating piece having a large size as before, the balance can be maintained without considering the weight balance.
- the first leg portion 41 and the second leg portion 42 are also miniaturized and narrowed, and the first leg portion 41 and the second leg portion that are small and narrow. If the groove part 45 is formed in 42, the balance of weight will collapse. As described above, a problem that could not be considered in the conventional tuning-fork type crystal vibrating piece is caused by downsizing.
- the groove 45 is formed to be biased with respect to the center of the first leg 41 and the second leg 42 in the width direction (X-axis direction), and the groove 45 In the end face shape in the width direction (X-axis direction), the lowest point 453 of the groove portion 45 is located at the center of the groove portion 45 in the width direction (X-axis direction) of the first leg portion 41 and the second leg portion 42.
- This is a characteristic configuration.
- the lowest point 453 of the groove portion 45 is located at the center of the groove portion 45 in the width direction (X-axis direction), so that it is formed of a crystal piece, and the groove portion 45 includes the first leg portion 41 and Weight correction can be further performed so as to maintain a weight balance with respect to the configuration formed to be deviated with respect to the center of the second leg portion 42 in the width direction (X-axis direction).
- Weight correction can be further performed so as to maintain a weight balance with respect to the configuration formed to be deviated with respect to the center of the second leg portion 42 in the width direction (X-axis direction).
- This is related to the use of a crystal piece for the crystal vibrating piece 2, and the side surface 452 composed of a plurality of surfaces of the groove 45 has an inclined surface, and the angle of the inclined surface of the side surface 452 (a plurality of surfaces) is different.
- the first leg is the groove 45. 41 and the second leg portion 42 in the end face shape in the width direction (X-axis direction), the lowest point 453 of the groove portion 45 is located at the center of the groove portion 45, so the angle of the inclined surface of the side surface 452 of the groove portion 45 is corrected.
- the weight correction at the legs (first leg 41 and second leg 42) can be performed by angle correction, and as a result, the weight balance can be maintained, and the first leg 41 and It is possible to suppress the influence on characteristics (CI value, etc.) due to the shape of the groove formed in the second leg portion 42.
- the first leg portion 41 and the second leg portion 42 are each formed with a crystal piece, and the groove portion 45 is formed in each of the first leg portion 41 and the second leg portion 42 in the width direction of the first leg portion 41 and the second leg portion 42.
- the lowest point 453 of the groove portion 45 is the X axis of the groove portion 45 in the end face shape in the width direction (X axis direction) shown in FIG. 2. Since it is located in the center of the direction, it is possible to prevent the weight balance from being lost with respect to the first leg portion 41 and the second leg portion 42.
- the position of the groove 45 is offset with respect to the center of the first leg 41 and the second leg 42 in the width direction (X-axis direction), and the width direction (X-axis direction) of the first leg 41 and the second leg 42 is determined. ) And left and right weight balance. Further, in the groove portion 45, the lowest point 453 of the groove portion 45 is located at the center of the groove portion 45 in the X-axis direction in the end face shape in the width direction (X-axis direction) of the first leg portion 41 and the second leg portion 42. Thus, the angle difference between the inclined surfaces of the side surfaces 452 (a plurality of surfaces) can be reduced. As a result, the weight balance is improved. On the other hand, in the conventional tuning-fork type crystal vibrating piece, the left and right slope angles in the leg are greatly different, so the vertical vibration of the leg is different on the left and right, and the weight balance is lost.
- each leg portion has a groove
- other vibration modes longitudinal vibration mode, etc.
- this is related to the fact that the lowest point or bottom surface of the groove is formed so as to be largely offset with respect to the center in the width direction of the groove, and the inner surface of the groove is relative to the main surface. It becomes an inclined surface.
- each of the first leg portion 41 and the second leg portion 42 has the groove portion 45 in the width direction of the first leg portion 41 and the second leg portion 42 (X-axis direction).
- the lowest point 453 of the groove portion 45 in the width direction (X-axis direction) shape of the first leg portion 41 and the second leg portion 42 is the width direction. Since it is located at the center in the (X-axis direction), the shape of the side surface 452 of the inner surface of the groove 45 in the widthwise direction (X-axis direction) of the first leg portion 41 and the second leg portion 42 is substantially symmetrical. can do.
- one or more inclined surfaces of the inner surface of the groove 45 can be reduced as compared with the conventional tuning fork type crystal vibrating piece.
- the generation of other vibration modes (longitudinal vibration mode, etc.) due to the reduced inclined surface can be suppressed, the deterioration of the characteristics of the crystal vibrating piece 2 can be suppressed, for example, the CI value can be lowered, or the CI The rise in value can be suppressed.
- the package size of a piezoelectric vibration device such as a crystal resonator 1 or an oscillator (not shown) on which the crystal resonator element 2 is mounted is currently tending to be small (for example, package size: 2.0 mm ⁇ 1.2 mm or less).
- the inventor has confirmed that spurious noise is generated in the vibration of the quartz crystal vibrating piece 2 as the size is reduced.
- spurious has hardly been generated in the crystal vibrating piece 2 and spurious suppression has not been considered in the past, but it is also necessary to consider suppressing spurious for the current small crystal vibrating piece 2.
- the spurious can be suppressed by reducing the slope of the side surface 452 of the groove 45 or reducing the difference between the slopes. It is most suitable for the quartz crystal vibrating piece 2. It is also possible to prevent the frequency value (main vibration value) oscillating due to spurious generation from changing.
- the lowest point 453 is at the opposing position in the end face shape in the protruding direction. It is possible to prevent the weight balance from being lost in the thickness direction of the leg portion 42. As a result, generation of other vibration modes (longitudinal vibration mode, etc.) due to the loss of weight balance can be suppressed, and deterioration of the characteristics of the crystal vibrating piece 2 can be suppressed. For example, the CI value can be lowered or the CI value can be reduced. Can be suppressed.
- the two bonding locations 53 of the base portion 5 are bonded to the electrode pads 35 of the base 3 via the conductive bumps 12, but the present invention is not limited to this.
- the joint portion 8 may be provided so as to protrude from the other end surface 52 of the base portion 5, and the joint portion 8 may be joined to the electrode pad 35 of the base 3 via the conductive bump 12. .
- the joint portion 8 includes a short side portion 81 projecting in a direction perpendicular to the other end surface 52 of the base portion 5 and a tip portion of the short side portion 81, and the base portion 5.
- the long side portion 82 extends in the width direction of the base portion 5, and the tip end portion 821 of the long side portion 82 faces the width direction of the base portion 5. That is, the joint portion 8 is formed in an L shape in plan view that is bent at a right angle in plan view.
- the bonding portion 8 is provided with two bonding portions 53 bonded to the electrode pads 35 of the base 3 via the conductive bumps 12.
- the groove portions 45 are formed in both the main surfaces 21 and 22 of the leg portions 41 and 42, but the present invention is not limited to this, and both the main portions of the leg portions 41 and 42 are both.
- the groove 45 may be formed only on one of the main surfaces 21 and 22. Even in this case, the effect according to the present embodiment is obtained, but it is preferable that the groove 45 is formed on both the main surfaces 21 and 22.
- the present invention can be applied to a tuning-fork type crystal vibrating piece using crystal.
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
本実施の形態にかかる音叉型水晶振動子1(以下、水晶振動子という)は、図1に示すように、フォトリソグラフィ法で成形された音叉型水晶振動片2(以下、水晶振動片という)と、水晶振動片2を搭載するベース3と、ベース3に搭載した(保持した)水晶振動片2を本体筐体内に気密封止するための蓋(図示省略)とが設けられて構成されている。
11 内部空間
12 導電性バンプ
2 水晶振動片
21 一主面
22 他主面
23 隙間部
3 ベース
31 底部
32 堤部
33 段部
34 メタライズ層
35 電極パッド
41 第1脚部
411 第1脚部の側面
42 第2脚部
421 第2脚部の側面
43 励振部
431 励振部の先端部
44 調整部
45 溝部
451 内面
452 側面
453 最下点
46 第1傾斜面
47 第2傾斜面
5 基部
51 一端面
52 他端面
53 接合箇所
61 第1励振電極
62 第2励振電極
63,64 引出電極
7 周波数調整用金属膜
8 接合部
81 短辺部
82 長辺部
821 長辺部の先端部
Claims (2)
- 音叉型水晶振動片において、
結晶方位を有する水晶片からなり、
基部と、前記基部から一方向に突出した一対の脚部と、が設けられ、
前記脚部各々には、溝部が、前記脚部の幅方向の中心に対して偏って形成され、
前記溝部では、前記幅方向の端面視形状において、前記溝部の最下点が、前記幅方向の前記溝部の中央に位置することを特徴とする音叉型水晶振動片。 - 請求項1に記載の音叉型水晶振動片において、
前記脚部の両主面には、それぞれ一主面側の溝部と他主面側の溝部が形成され、
一主面側の溝部と他主面側の溝部とでは、突出方向の端面視形状において、前記最下点が対向位置にあることを特徴とする音叉型水晶振動片。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US14/409,272 US9344057B2 (en) | 2012-12-21 | 2013-12-11 | Tuning-fork type crystal resonator plate |
CN201380073572.6A CN105075119B (zh) | 2012-12-21 | 2013-12-11 | 音叉型水晶振动片 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012280035A JP2014123911A (ja) | 2012-12-21 | 2012-12-21 | 音叉型水晶振動片 |
JP2012-280035 | 2012-12-21 |
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Publication Number | Publication Date |
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WO2014097945A1 true WO2014097945A1 (ja) | 2014-06-26 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2013/083243 WO2014097945A1 (ja) | 2012-12-21 | 2013-12-11 | 音叉型水晶振動片 |
Country Status (5)
Country | Link |
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US (1) | US9344057B2 (ja) |
JP (1) | JP2014123911A (ja) |
CN (1) | CN105075119B (ja) |
TW (1) | TWI508441B (ja) |
WO (1) | WO2014097945A1 (ja) |
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KR20160076711A (ko) * | 2014-12-23 | 2016-07-01 | 삼성전기주식회사 | 튜닝 포크형 진동자 |
JP6939876B2 (ja) * | 2017-03-30 | 2021-09-22 | 株式会社大真空 | 音叉型圧電振動片および当該音叉型圧電振動片を用いた音叉型圧電振動子 |
EP3468036A1 (fr) * | 2017-10-03 | 2019-04-10 | Micro Crystal AG | Résonateur piezo-electrique de petite taille |
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JP2007258918A (ja) * | 2006-03-22 | 2007-10-04 | Epson Toyocom Corp | 圧電デバイス |
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FR2467487A1 (fr) | 1979-10-15 | 1981-04-17 | Ebauches Sa | Resonateur piezoelectrique |
JP2002261577A (ja) * | 2001-03-02 | 2002-09-13 | Seiko Epson Corp | 振動片、振動子、発振器及び携帯用電話装置 |
JP2004282230A (ja) | 2003-03-13 | 2004-10-07 | Seiko Epson Corp | 圧電振動片、及びこれを利用した圧電デバイス、並びにこれを利用した携帯電話装置、電子機器 |
JP4329492B2 (ja) * | 2003-10-28 | 2009-09-09 | セイコーエプソン株式会社 | 圧電振動片と圧電デバイスおよびこれらの製造方法、ならびに圧電デバイスを利用した携帯電話装置および圧電デバイスを利用した電子機器 |
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JP2006086726A (ja) * | 2004-09-15 | 2006-03-30 | Seiko Epson Corp | 圧電振動片と圧電デバイスおよび圧電デバイスの製造方法 |
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-
2012
- 2012-12-21 JP JP2012280035A patent/JP2014123911A/ja active Pending
-
2013
- 2013-12-11 CN CN201380073572.6A patent/CN105075119B/zh active Active
- 2013-12-11 WO PCT/JP2013/083243 patent/WO2014097945A1/ja active Application Filing
- 2013-12-11 US US14/409,272 patent/US9344057B2/en active Active
- 2013-12-19 TW TW102147230A patent/TWI508441B/zh active
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JP2004007428A (ja) * | 2002-03-25 | 2004-01-08 | Seiko Epson Corp | 音叉型圧電振動片及びその製造方法、圧電デバイス |
JP2007158386A (ja) * | 2005-11-30 | 2007-06-21 | Seiko Instruments Inc | 圧電振動片の製造方法、圧電振動片、圧電振動子、発振器、電子機器及び電波時計 |
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Also Published As
Publication number | Publication date |
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CN105075119A (zh) | 2015-11-18 |
US20150171824A1 (en) | 2015-06-18 |
CN105075119B (zh) | 2018-09-25 |
TW201448462A (zh) | 2014-12-16 |
JP2014123911A (ja) | 2014-07-03 |
US9344057B2 (en) | 2016-05-17 |
TWI508441B (zh) | 2015-11-11 |
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