WO2020241790A1 - 圧電振動板および圧電振動デバイス - Google Patents
圧電振動板および圧電振動デバイス Download PDFInfo
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- WO2020241790A1 WO2020241790A1 PCT/JP2020/021219 JP2020021219W WO2020241790A1 WO 2020241790 A1 WO2020241790 A1 WO 2020241790A1 JP 2020021219 W JP2020021219 W JP 2020021219W WO 2020241790 A1 WO2020241790 A1 WO 2020241790A1
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- excitation electrode
- piezoelectric
- piezoelectric diaphragm
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- vibrating
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/19—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of quartz
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders or supports
- H03H9/10—Mounting in enclosures
- H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
- H03H9/1035—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by two sealing substrates sandwiching the piezoelectric layer of the BAW device
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
- H03H9/132—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials characterized by a particular shape
Definitions
- the present invention relates to a piezoelectric diaphragm and a piezoelectric vibration device including the piezoelectric diaphragm.
- a piezoelectric vibration device for example, a piezoelectric vibrator, a piezoelectric oscillator, etc.
- a piezoelectric vibration plate that operates by thickness sliding vibration such as an AT-cut crystal vibration plate
- the structure is such that an AC voltage is applied to the excitation electrode.
- the frequency of such piezoelectric vibration devices has been increased (for example, a frequency of about 150 MHz), and along with this, spurious may be generated in the vicinity of the main vibration of the piezoelectric vibration device. There is concern that it may adversely affect the characteristics of.
- spurious is reduced by arranging a pair of excitation electrodes of a piezoelectric diaphragm in a staggered manner (see, for example, Patent Document 1).
- a piezoelectric diaphragm including a vibrating portion, an outer frame portion surrounding the outer periphery of the vibrating portion, and a holding portion connecting the vibrating portion and the outer frame portion is known (for example, Patent Document). 1).
- a piezoelectric diaphragm with a so-called frame in which such a vibrating portion and an outer frame portion are connected by a holding portion a pair of excitation electrodes are formed in substantially the same shape (mainly a rectangle), and are substantially identical in plan view. Since they were placed at the same positions, measures to reduce spurious were still insufficient.
- the present invention has been made in consideration of the above-mentioned circumstances, and is a piezoelectric diaphragm with a frame in which a vibrating portion and an outer frame portion are connected by a holding portion, and a piezoelectric diaphragm provided with such a piezoelectric diaphragm.
- the purpose is to reduce spurious and improve electrical characteristics in vibrating devices.
- the present invention constitutes means for solving the above-mentioned problems as follows. That is, the present invention is a piezoelectric vibrating plate that operates by thickness sliding vibration, and is a holding portion that connects the vibrating portion, the outer frame portion surrounding the outer periphery of the vibrating portion, and the vibrating portion and the outer frame portion. A cutout portion formed by cutting out the piezoelectric vibrating plate is provided between the vibrating portion and the outer frame portion, and a first excitation electrode is formed on one main surface of the vibrating portion. A second excitation electrode paired with the first excitation electrode is formed on the other main surface of the vibrating portion, and one of the first excitation electrode and the second excitation electrode has the other excitation electrode.
- the other excitation electrode has at least one parallel side parallel to each other, and the protruding portion is a portion between the parallel sides in a plan view. It is characterized by having an outer edge shape that protrudes outward and does not follow the parallel side in a plan view.
- the protruding portion of one excitation electrode since the protruding portion of one excitation electrode has an outer edge shape that does not follow the parallel side of the other excitation electrode in a plan view, spurious caused by the outer edge shape of one excitation electrode is reduced. can do.
- spurious in the piezoelectric diaphragm with a frame in which the vibrating portion and the outer frame portion are connected by the holding portion, spurious can be reduced and the electrical characteristics can be improved.
- an electromechanical connection point is not directly formed in the vibrating portion in the process after the vibrating portion is formed. Spurious is not generated due to the formation of the connection point.
- the excitation electrode can be formed without considering the above connection points, so that the degree of freedom in designing the excitation electrode is increased, and the size and position of the electrode can be adjusted. It will be easier to adjust.
- the excitation electrode large to enhance the electrical characteristics, or by arranging the center of the vibrating part and the center of the excitation electrode so that they are substantially aligned in a plan view, the generation of spurious asymmetric vibration mode can be generated. It can be suppressed.
- the present invention is a piezoelectric vibrating plate that operates by thickness sliding vibration, and is a holding portion that connects the vibrating portion, the outer frame portion that surrounds the outer periphery of the vibrating portion, and the vibrating portion and the outer frame portion.
- a cutout portion formed by cutting out the piezoelectric vibrating plate is provided between the vibrating portion and the outer frame portion, and a first excitation electrode is formed on one main surface of the vibrating portion.
- a second excitation electrode paired with the first excitation electrode is formed on the other main surface of the vibrating portion, and both the first excitation electrode and the second excitation electrode are straight lines parallel to the X axis of the piezoelectric vibrating plate.
- the protruding portion has an outer edge shape that is not along the X axis in a plan view.
- the protruding portion of one excitation electrode since the protruding portion of one excitation electrode has an outer edge shape that is not along the X axis in a plan view, spurious caused by the outer edge shape of one excitation electrode can be reduced. ..
- spurious can be reduced in the piezoelectric diaphragm with a frame in which the vibrating portion and the outer frame portion are connected by the holding portion, spurious can be reduced and the electrical characteristics can be improved.
- an electromechanical connection point is not directly formed in the vibrating portion in the process after the vibrating portion is formed. Spurious is not generated due to the formation of the connection point.
- the excitation electrode can be formed without considering the above connection points, so that the degree of freedom in designing the excitation electrode is increased, and the size and position of the electrode can be adjusted. It will be easier to adjust.
- the excitation electrode large to enhance the electrical characteristics, or by arranging the center of the vibrating part and the center of the excitation electrode so that they are substantially aligned in a plan view, the generation of spurious asymmetric vibration mode can be generated. It can be suppressed.
- the center of gravity of the one excitation electrode and the center of gravity of the other excitation electrode are provided at positions that substantially coincide with each other in a plan view.
- the protruding portion of one excitation electrode can be formed into a shape line-symmetrical with respect to a straight line passing through the center of gravity of one excitation electrode and parallel to the X-axis. As a result, it is possible to reduce spurious generated due to the asymmetrical protrusion of one of the excitation electrodes.
- the present invention is a piezoelectric vibrating plate that operates by thickness sliding vibration, and is a holding portion that connects the vibrating portion, the outer frame portion surrounding the outer periphery of the vibrating portion, and the vibrating portion and the outer frame portion.
- a cutout portion formed by cutting out the piezoelectric vibrating plate is provided between the vibrating portion and the outer frame portion, and a first excitation electrode is formed on one main surface of the vibrating portion.
- a second excitation electrode paired with the first excitation electrode is formed on the other main surface of the vibrating portion, and the center of gravity of the first excitation electrode and the center of gravity of the second excitation electrode substantially coincide with each other in a plan view.
- One of the first excitation electrode and the second excitation electrode is provided at a position and is inclined with respect to the other excitation electrode in a plan view.
- the excitation electrode can be formed without considering the above connection points, so that the degree of freedom in designing the excitation electrode is increased, and the size and position of the electrode can be adjusted. It will be easier to adjust.
- the excitation electrode large to enhance the electrical characteristics, or by arranging the center of the vibrating part and the center of the excitation electrode so that they are substantially aligned in a plan view, the generation of spurious asymmetric vibration mode can be generated. It can be suppressed.
- tilt arrangement means that one excitation electrode is rotated, shifted (sliding), has a protrusion, or is expanded or contracted with respect to the other excitation electrode. Is.
- the one excitation electrode has protrusions that do not overlap with each other in a plan view and protrude outward at positions on both sides of the first excitation electrode with the center of gravity of the first excitation electrode interposed therebetween. It is preferable that each of the protrusions has an outer edge shape that does not follow the outer edge of the other excitation electrode in a plan view. According to this configuration, the protrusions provided at the positions on both sides of the center of gravity of the first excitation electrode have an outer edge shape that does not follow the outer edge of the other excitation electrode in a plan view. It is possible to reduce spurious caused by the outer edge shape of the excitation electrode.
- the protruding portion of the one excitation electrode can be regarded as the center of gravity of the one excitation electrode. It can be formed in a shape line-symmetrical with respect to a straight line passing through and parallel to the outer edge of the other excitation electrode. As a result, it is possible to reduce spurious generated due to the asymmetrical protrusion of one of the excitation electrodes.
- the area of the other excitation electrode is preferably larger than the area of the one excitation electrode. According to this configuration, the frequency of the piezoelectric diaphragm can be easily adjusted by performing, for example, ion partial on the other excitation electrode having a larger area.
- the first and second excitation electrodes have substantially the same shape (mainly) as described above. It was formed in a rectangular shape) and was placed at positions that substantially matched in plan view.
- the areas of the first and second excitation electrodes different, it is possible to secure a region for frequency adjustment in the other excitation electrode having a larger area, which is advantageous for frequency adjustment of the piezoelectric diaphragm.
- the area of the other excitation electrode is smaller than the area of one excitation electrode, the room temperature CI value of the piezoelectric diaphragm may become high, or the temperature change of the CI value may become unstable.
- the characteristics of the piezoelectric diaphragm temperature characteristics of normal temperature CI value and CI value
- the first lead-out wiring connected to the first excitation electrode is formed on one main surface of the holding portion, and the second main surface connected to the second excitation electrode is formed on the other main surface of the holding portion. It is preferable that the lead-out wiring is formed and the first lead-out wiring and the second lead-out wiring extend in the same direction. According to this configuration, since the first and second lead-out wires extend in the same direction, the first and second lead-out wires and the first and second lead-out wires extend in different directions as compared with the case where the first and second lead-out wires extend in different directions.
- the wiring connected to the first and second extraction wiring can be simplified, and complicated wiring becomes unnecessary, which contributes to the miniaturization of the piezoelectric diaphragm.
- one of the first lead-out wiring and the second lead-out wiring is arranged so as to be offset from the other lead-out wiring in a plan view.
- vibration may occur at the overlapping portion of the first and second lead-out wirings, and vibration leakage to the outer frame portion may occur. Therefore, by making the overlapping portion of the first and second drawer wirings as small as possible, the vibration generated in the first and second drawer wirings can be suppressed, and the vibration leakage to the outer frame portion can be suppressed. Can be done.
- one of the excitation electrodes is formed in a rhombus shape and the other excitation electrode is formed in a rectangular shape. According to this configuration, all the outer edges of one excitation electrode are not along the X-axis in plan view. Thereby, spurious caused by the outer edge shape of one of the excitation electrodes can be reduced more efficiently.
- the first and second excitation electrodes are conventionally formed in substantially the same shape (mainly a rectangle). , It was placed at a position that almost matched in plan view.
- the other excitation electrode into a rectangle, the frequency of the piezoelectric diaphragm can be adjusted by using the same mask and jig for the rectangular electrode as in the conventional case, which is advantageous for frequency adjustment.
- the present invention is a piezoelectric vibrating device including a piezoelectric vibrating plate having any of the above configurations, wherein the first sealing member covering the first exciting electrode of the piezoelectric vibrating plate and the piezoelectric vibrating plate are described. A second sealing member that covers the second excitation electrode is provided, the first sealing member and the piezoelectric vibrating plate are joined, and the second sealing member and the piezoelectric vibrating plate are joined. Therefore, the vibrating portion of the piezoelectric vibrating plate is hermetically sealed. According to the piezoelectric vibration device provided with the piezoelectric diaphragm having the above configuration, the same action and effect as the action and effect of the piezoelectric diaphragm described above can be obtained.
- the protruding portion of one excitation electrode since the protruding portion of one excitation electrode has an outer edge shape that does not follow the parallel side of the other excitation electrode in a plan view, spurious caused by the outer edge shape of one excitation electrode is reduced. can do. As a result, in the piezoelectric diaphragm with a frame in which the vibrating portion and the outer frame portion are connected by the holding portion, spurious can be reduced and the electrical characteristics can be improved.
- FIG. 2 is a schematic plan view of the first sealing member of the crystal oscillator on the first main surface side.
- FIG. 3 is a schematic plan view of the first sealing member of the crystal oscillator on the second main surface side.
- FIG. 4 is a schematic plan view of the first main surface side of the crystal diaphragm according to the present embodiment.
- FIG. 5 is a schematic plan view of the crystal diaphragm according to the present embodiment on the second main surface side.
- FIG. 6 is a schematic plan view of the second sealing member of the crystal oscillator on the first main surface side.
- FIG. 7 is a schematic plan view of the second sealing member of the crystal oscillator on the second main surface side.
- FIG. 8 is a schematic plan view showing the positional relationship between the first and second excitation electrodes of the quartz diaphragm, the first and second lead-out wirings, and the like.
- the crystal oscillator 100 includes a crystal diaphragm (piezoelectric diaphragm) 10, a first sealing member 20, and a second sealing member 30.
- the crystal diaphragm 10 and the first sealing member 20 are joined, and the crystal diaphragm 10 and the second sealing member 30 are joined to form a package having a substantially rectangular parallelepiped sandwich structure. It is composed. That is, in the crystal oscillator 100, the internal space (cavity) of the package is formed by joining the first sealing member 20 and the second sealing member 30 to both main surfaces of the crystal diaphragm 10.
- the vibrating portion 11 (see FIGS. 4 and 5) is hermetically sealed in this internal space.
- the crystal oscillator 100 has, for example, a package size of 1.0 ⁇ 0.8 mm, and is designed to be compact and low in height. Further, with the miniaturization, in the package, the electrodes are made conductive by using through holes, which will be described later, without forming castration. Further, the crystal oscillator 100 is electrically connected to an external circuit board (not shown) provided outside via solder.
- FIGS. 1 to 7 show only one configuration example of each of the crystal diaphragm 10, the first sealing member 20, and the second sealing member 30, and these are not limited to the present invention.
- the crystal diaphragm 10 is a piezoelectric substrate made of quartz, and both main surfaces (first main surface 101 and second main surface 102) are flat and smooth. It is formed as a surface (mirror surface processing).
- the crystal diaphragm 10 an AT-cut quartz plate that performs thickness sliding vibration is used.
- both main surfaces 101 and 102 of the crystal diaphragm 10 are formed as XZ'planes.
- the direction parallel to the lateral direction (short side direction) of the crystal vibrating plate 10 is the X-axis direction
- the direction parallel to the longitudinal direction (long side direction) of the crystal vibrating plate 10 is the Z'axis. It is said to be the direction.
- the AT cut is 35 ° around the X axis with respect to the Z axis among the three crystal axes of the artificial quartz, the electric axis (X axis), the mechanical axis (Y axis), and the optical axis (Z axis).
- This is a processing method that cuts out at an angle tilted by 15'.
- the X-axis coincides with the crystal axis of the quartz.
- the Y'axis and Z'axis were tilted approximately 35 ° 15'from the Y and Z axes of the crystal axis of the crystal, respectively (this cutting angle was slightly changed within the range of adjusting the frequency temperature characteristics of the AT-cut crystal vibrating plate. May) coincide with the axis.
- the Y'axis direction and the Z'axis direction correspond to the cutting direction when cutting out the AT-cut quartz plate.
- a pair of excitation electrodes (first excitation electrode 111, second excitation electrode 112) are formed on both main surfaces 101 and 102 of the crystal diaphragm 10.
- the crystal diaphragm 10 holds the vibrating portion 11 by connecting the vibrating portion 11 formed in a substantially rectangular shape, the outer frame portion 12 surrounding the outer circumference of the vibrating portion 11, and the vibrating portion 11 and the outer frame portion 12. It has a holding portion 13 and a holding portion 13. That is, the crystal diaphragm 10 has a configuration in which the vibrating portion 11, the outer frame portion 12, and the holding portion 13 are integrally provided.
- the holding portion 13 extends (projects) from only one corner portion of the vibrating portion 11 located in the + X direction and the ⁇ Z ′ direction to the outer frame portion 12 in the ⁇ Z ′ direction.
- a cutout portion 10a formed by cutting out the crystal diaphragm 10 is provided between the vibrating portion 11 and the outer frame portion 12.
- the crystal diaphragm 10 is provided with only one holding portion 13 for connecting the vibrating portion 11 and the outer frame portion 12, and the cutout portion 10a surrounds the outer circumference of the vibrating portion 11. It is formed continuously in.
- the first excitation electrode 111 is provided on the first main surface 101 side of the vibrating portion 11, and the second excitation electrode 112 is provided on the second main surface 102 side of the vibrating portion 11.
- the first excitation electrode (one excitation electrode) 111 is formed in a rhombus shape
- the second excitation electrode (the other excitation electrode) 112 is formed in a square shape.
- Lead-out wirings (first lead-out wiring 113, second lead-out wiring 114) for connecting these excitation electrodes to external electrode terminals are connected to the first excitation electrode 111 and the second excitation electrode 112.
- the first lead-out wiring 113 is drawn out from the first excitation electrode 111 and is connected to the connection joint pattern 14 formed on the outer frame portion 12 via the holding portion 13.
- the second lead-out wiring 114 is drawn out from the second excitation electrode 112 and is connected to the connection joint pattern 15 formed on the outer frame portion 12 via the holding portion 13. Details of the first and second excitation electrodes 111 and 112 will be described later.
- a vibration-side first bonding pattern 121 is formed as a vibration-side sealing portion of the first main surface 101
- a vibration-side second bonding pattern 122 is formed as a vibration-side sealing portion of the second main surface 102.
- the vibration-side first joint pattern 121 and the vibration-side second joint pattern 122 are provided on the outer frame portion 12, and are formed in an annular shape in a plan view.
- the crystal diaphragm 10 is formed with five through holes penetrating between the first main surface 101 and the second main surface 102.
- the four first through holes 161 are provided in the regions of the four corners (corners) of the outer frame portion 12, respectively.
- the second through hole 162 is an outer frame portion 12, and is provided on one side of the vibrating portion 11 in the Z'axis direction (in the drawings 4 and 5, the ⁇ Z'direction side).
- a connection pattern 123 is formed around the first through hole 161.
- a connection joint pattern 124 is formed on the first main surface 101 side, and a connection joint pattern 15 is formed on the second main surface 102 side.
- first through hole 161 and the second through hole 162 through electrodes for conducting the electrodes formed on the first main surface 101 and the second main surface 102 are provided along the inner wall surface of each of the through holes. It is formed. Further, the central portion of each of the first through hole 161 and the second through hole 162 is a hollow through portion penetrating between the first main surface 101 and the second main surface 102.
- the first sealing member 20 is a rectangular parallelepiped substrate formed from one AT-cut quartz plate, and the second main surface 202 (crystal vibration) of the first sealing member 20.
- the surface to be joined to the plate 10) is formed as a flat smooth surface (mirror surface processing).
- the first sealing member 20 does not have a vibrating portion, the coefficient of thermal expansion of the crystal diaphragm 10 and the first sealing member 20 can be increased by using the AT-cut crystal plate as in the crystal diaphragm 10. It can be the same, and thermal deformation in the crystal unit 100 can be suppressed. Further, the directions of the X-axis, Y-axis and Z'-axis of the first sealing member 20 are also the same as those of the crystal diaphragm 10.
- the first main surface 201 (outer main surface not facing the crystal diaphragm 10) of the first sealing member 20 has first and second metal films 22 and 23 for wiring.
- a third metal film 28 for shielding is formed.
- the first and second metal films 22 and 23 for wiring electrically connect the first and second excitation electrodes 111 and 112 of the crystal diaphragm 10 and the external electrode terminals 32 of the second sealing member 30. It is provided as wiring for.
- the first and second metal films 22 and 23 are provided at both ends in the Z'axis direction, the first metal film 22 is provided on the + Z'direction side, and the second metal film 23 is ⁇ Z ′. It is provided on the directional side.
- the first and second metal films 22 and 23 are formed so as to extend in the X-axis direction.
- the first metal film 22 is formed in a substantially rectangular shape, and a protruding portion 22a protruding in the ⁇ Z ′ direction is provided on a portion of the first metal film 22 on the + X direction side.
- the second metal film 23 is formed in a substantially rectangular shape, and a protruding portion 23a protruding in the + Z'direction is provided on the portion of the second metal film 23 on the ⁇ X direction side.
- the third metal film 28 is provided between the first and second metal films 22 and 23, and is arranged at a predetermined interval from the first and second metal films 22 and 23.
- the third metal film 28 is provided in almost all areas of the first main surface 201 of the first sealing member 20 in which the first and second metal films 22 and 23 are not formed.
- the first sealing member 20 is formed with six through holes penetrating between the first main surface 201 and the second main surface 202. Specifically, four third through holes 211 are provided in the regions of the four corners (corners) of the first sealing member 20. The fourth and fifth through holes 212 and 213 are provided in the + Z'direction and the ⁇ Z'direction in FIGS. 2 and 3, respectively.
- third through holes 211 and the fourth and fifth through holes 212 and 213 through electrodes for conducting the electrodes formed on the first main surface 201 and the second main surface 202 are provided in each of the through holes. It is formed along the inner wall surface. Further, the central portion of each of the third through hole 211 and the fourth and fifth through holes 212 and 213 is a hollow through portion penetrating between the first main surface 201 and the second main surface 202. Then, two third through holes 211 and 211 (third throughs located at the corners in the + X direction and the + Z'direction of FIGS. 2 and 3) located diagonally to the first main surface 201 of the first sealing member 20.
- the through electrodes of the hole 211 and the third through hole 211) located at the corners in the ⁇ X direction and the ⁇ Z ′ direction are electrically connected by the third metal film 28. Further, the through electrodes of the third through hole 211 and the through electrodes of the fourth through hole 212 located at the corners in the ⁇ X direction and the + Z ′ direction are electrically connected by the first metal film 22. The through electrodes of the third through hole 211 and the through electrodes of the fifth through hole 213 located at the corners in the + X direction and the ⁇ Z'direction are electrically connected by the second metal film 23.
- a sealing-side first joining pattern 24 is formed as a sealing-side first sealing portion for joining to the crystal diaphragm 10.
- the first bonding pattern 24 on the sealing side is formed in an annular shape in a plan view.
- a connection pattern 25 is formed around the third through hole 211, respectively.
- a connection pattern 261 is formed around the fourth through hole 212, and a connection joint pattern 262 is formed around the fifth through hole 213.
- a connection joint pattern 263 is formed on the opposite side (-Z'direction side) of the first sealing member 20 in the major axis direction with respect to the connection joint pattern 261 to connect with the connection joint pattern 261. It is connected to the joint pattern 263 by a wiring pattern 27.
- the second sealing member 30 is a rectangular parallelepiped substrate formed from one AT-cut quartz plate, and the first main surface 301 (crystal vibration) of the second sealing member 30.
- the surface to be joined to the plate 10) is formed as a flat smooth surface (mirror surface processing). It is desirable that the second sealing member 30 also uses an AT-cut crystal plate as in the crystal diaphragm 10, and the directions of the X-axis, Y-axis, and Z'axis are the same as those of the crystal diaphragm 10.
- a sealing-side second joining pattern 31 is formed as a sealing-side second sealing portion for joining to the crystal diaphragm 10.
- the sealing-side second bonding pattern 31 is formed in an annular shape in a plan view.
- the second main surface 302 (outer main surface not facing the crystal diaphragm 10) of the second sealing member 30 there are four externals that are electrically connected to an external circuit board provided outside the crystal oscillator 100.
- the electrode terminal 32 is provided.
- the external electrode terminals 32 are located at four corners (corners) of the second main surface 302 of the second sealing member 30.
- the second sealing member 30 is formed with four through holes penetrating between the first main surface 301 and the second main surface 302.
- the four sixth through holes 33 are provided in the regions of the four corners (corners) of the second sealing member 30.
- through electrodes for conducting conduction of the electrodes formed on the first main surface 301 and the second main surface 302 are formed along the inner wall surface of each of the sixth through holes 33. There is. Through the through electrodes formed on the inner wall surface of the sixth through hole 33 in this way, the electrodes formed on the first main surface 301 and the external electrode terminals 32 formed on the second main surface 302 are conducted. ..
- each of the sixth through holes 33 is a hollow through portion that penetrates between the first main surface 301 and the second main surface 302. Further, on the first main surface 301 of the second sealing member 30, a connection pattern 34 is formed around the sixth through hole 33, respectively.
- the crystal diaphragm 10 and the first sealing member 20 have a vibrating side first bonding pattern 121 and The first bonding pattern 24 on the sealing side is diffusively bonded in a state of being overlapped, and the crystal diaphragm 10 and the second sealing member 30 overlap the second bonding pattern 122 on the vibrating side and the second bonding pattern 31 on the sealing side.
- the sandwich-structured package shown in FIG. 1 is manufactured by diffusion-bonding in this state. As a result, the internal space of the package, that is, the accommodation space of the vibrating portion 11 is hermetically sealed.
- the connection patterns described above are also diffusely joined in a superposed state. Then, by joining the connection patterns to each other, the crystal oscillator 100 can obtain electrical conduction between the first excitation electrode 111, the second excitation electrode 112, and the external electrode terminal 32.
- the first excitation electrode 111 includes a first lead wiring 113, a wiring pattern 27, a fourth through hole 212, a first metal film 22, a third through hole 211, a first through hole 161 and a sixth through hole. It is connected to the external electrode terminal 32 via the holes 33 in order.
- the second excitation electrode 112 includes a second lead wire 114, a second through hole 162, a fifth through hole 213, a second metal film 23, a third through hole 211, a first through hole 161 and a sixth through hole 33. It is connected to the external electrode terminal 32 via the sequence. Further, the third metal film 28 is connected to the ground (ground connection, using a part of the external electrode terminal 32) via the third through hole 211, the first through hole 161 and the sixth through hole 33 in this order. ing.
- the crystal oscillator 100 it is assumed that a plurality of layers are laminated on a quartz plate, and a Ti (titanium) layer and an Au (gold) layer are vapor-deposited from the lowest layer side thereof in various bonding patterns. Is preferable. Further, if the other wirings and electrodes formed on the crystal oscillator 100 have the same configuration as the bonding pattern, the bonding patterns, wirings and electrodes can be patterned at the same time, which is preferable.
- the sealing portions (seal paths) 115 and 116 that airtightly seal the vibrating portion 11 of the crystal diaphragm 10 are formed in an annular shape in a plan view.
- the seal path 115 is formed by diffusion bonding of the vibration side first bonding pattern 121 and the sealing side first bonding pattern 24 described above, and the outer edge shape and the inner edge shape of the seal path 115 are formed in a substantially octagonal shape.
- the seal path 116 is formed by the diffusion bonding of the vibration side second bonding pattern 122 and the sealing side second bonding pattern 31 described above, and the outer edge shape and the inner edge shape of the seal path 116 are formed in a substantially octagonal shape.
- the first sealing member 20 and the crystal diaphragm 10 have a gap of 1.00 ⁇ m or less
- the second sealing member 30 And the crystal diaphragm 10 have a gap of 1.00 ⁇ m or less. That is, the thickness of the seal path 115 between the first sealing member 20 and the crystal diaphragm 10 is 1.00 ⁇ m or less, and the thickness of the seal path 116 between the second sealing member 30 and the crystal diaphragm 10 is 1.00 ⁇ m or less. , 1.00 ⁇ m or less (specifically, 0.15 ⁇ m to 1.00 ⁇ m in the Au-Au junction of the present embodiment). As a comparative example, in the conventional metal paste encapsulant using Sn, the thickness is 5 ⁇ m to 20 ⁇ m.
- the first excitation electrode (one excitation electrode) 111 is formed in a rhombus shape
- the second example vibration electrode (the other excitation electrode) 112 is formed in a square shape.
- the first excitation electrode 111 is formed in a shape that is line-symmetric with respect to a straight line L1 that passes through the center of gravity (center) 111a of the first excitation electrode 111 and is parallel to the X axis.
- the second excitation electrode 112 is formed in a shape symmetrical with respect to the straight line L2 passing through the center of gravity (center) 112a of the second excitation electrode 112 and parallel to the X axis.
- the center of gravity 111a of the first excitation electrode 111 and the center of gravity 112a of the second excitation electrode 112 are provided at positions that substantially coincide with each other in a plan view.
- the area of the second excitation electrode 112 formed in a square shape is larger than the area of the first excitation electrode 111 formed in a rhombus shape.
- the second excitation electrode 112 has at least one parallel side 112e, 112g parallel to each other among the four sides 111e, 111f, 111g, 111h, and the parallel sides 112e, 112g extend parallel to the X axis. ..
- the first excitation electrode 111 does not completely overlap the second excitation electrode 112 in a plan view, and faces outward from the portion between the parallel sides 112e and 112g (the portion sandwiched between the parallel sides 112e and 112g). At least one protruding portion is provided.
- the protruding portion 111c protruding outward (+ Z'direction side) from one side 112e on the + Z'direction side and the second excitation electrode 112.
- a protruding portion 111d that protrudes toward the outside (-Z'direction side) from one side 112g on the -Z'direction side.
- Protruding portions 111c and 111d are provided at both ends of the first excitation electrode 111 in the Z'axis direction.
- the protruding portions 111c and 111d are provided at positions on both sides of the first excitation electrode 111 with the center of gravity 111a in between, in this case, at both ends of the first excitation electrode 111 in the Z'axis direction.
- the protruding portions 111c and 111d have an outer edge shape that is not (not parallel) along the parallel sides 112e and 112g in a plan view.
- the projecting portions 111c and 111d have an outer edge shape that protrudes outward from the portion between the parallel sides 112e and 112g in a plan view and does not follow the parallel sides 112e and 112g in a plan view.
- the protrusions 111c and 111d have an outer edge shape that is not (not parallel) along the X axis in a plan view.
- the center of gravity (center) 111a of the first excitation electrode 111 and the center of gravity (center) 112a of the second excitation electrode 112 are located at positions where they substantially coincide with each other in a plan view.
- the first excitation electrode 111 is provided and is arranged at an angle with respect to the second excitation electrode 112 in a plan view.
- tilt arrangement means that the outer edge of one of the first excitation electrode 111 and the second excitation electrode 112 is inclined with respect to the outer edge of the other excitation electrode, and one of them is arranged. It means that the excitation electrode of No. 1 is rotated, shifted (sliding), has a protruding portion, and is expanded and contracted with respect to the other excitation electrode.
- a specific description will be given.
- the first excitation electrode (one excitation electrode) 111 is formed in a rhombus shape
- the second excitation electrode (the other excitation electrode) 112 is formed in a square shape.
- the first excitation electrode 111 is formed in a shape symmetrical with respect to the straight line L1 passing through the center of gravity 111a of the first excitation electrode 111 and parallel to the X axis.
- the second excitation electrode 112 is formed in a shape symmetrical with respect to the straight line L2 passing through the center of gravity 112a of the second excitation electrode 112 and parallel to the X axis.
- the four sides 111e, 111f, 111g, 111h, which are the outer edges of the first excitation electrode 111, are arranged at an angle with respect to the four sides 112e, 112f, 112g, 112h, which are the outer edges of the second excitation electrode 112. All of the four sides 112e, 112f, 112g, 112h of the second excitation electrode 112 extend in the direction parallel to the X-axis or the Z'axis, whereas the four sides 111e, 111f, 111g, 111h of the first excitation electrode 111 Not all of them extend in the direction parallel to the X-axis or Z'axis. All of the four sides 111e, 111f, 111g, 111h of the first excitation electrode 111 extend in the direction inclined in the X-axis and the Z'axis.
- One side 111e of the first excitation electrode 111 is inclined by approximately 45 ° with respect to one side 112e (or one side 112f) of the second excitation electrode 112, and extends in a direction inclined in the X-axis and the Z'axis.
- One side 111f of the first excitation electrode 111 is inclined by approximately 45 ° with respect to one side 112f (or one side 112g) of the second excitation electrode 112, and extends in a direction inclined in the X-axis and the Z'axis.
- One side 111g of the first excitation electrode 111 is inclined by approximately 45 ° with respect to one side 112g (or one side 112h) of the second excitation electrode 112, and extends in a direction inclined in the X-axis and the Z'axis.
- One side 111h of the first excitation electrode 111 is inclined by approximately 45 ° with respect to one side 112h (or one side 112e) of the second excitation electrode 112, and extends in a direction inclined in the X-axis and the Z'axis.
- the first lead-out wiring 113 connected to the first excitation electrode 111 is formed on the first main surface of the holding portion 13, and the second excitation electrode 112 is formed on the second main surface of the holding portion 13.
- a second lead-out wiring 114 is formed to connect to.
- the first lead-out wiring 113 extends from the corner portion (top portion) of the first excitation electrode 111 in the ⁇ Z ′ direction.
- the second lead-out wiring 114 extends from the corner (top) of the second excitation electrode 112 in the ⁇ Z ′ direction.
- the first lead-out wiring 113 and the second lead-out wiring 114 are formed to have substantially the same width.
- One of the first lead-out wiring 113 and the second lead-out wire 114 is arranged so as to be offset from the other in a plan view.
- a part of each of the first and second drawer wirings 113 and 114 overlaps with each other, but most of the first and second drawer wirings 113 and 114 do not overlap with each other.
- the boundary line 111b (FIG. 4) between the first excitation electrode 111 and the first lead-out wiring 113 and the boundary line 112b (FIG. 5) between the second excitation electrode 112 and the second lead-out wiring 114 are shown by a alternate long and short dash line. ing.
- the protruding portions 111c and 111d are formed in a substantially triangular shape, and have an outer edge shape that does not follow the parallel sides 112e and 112g in a plan view. Specifically, the protruding end (the end on the + Z'direction side) of the protruding portion 111c does not follow the parallel side 112e in a plan view and has a shape having an angle. That is, the protruding end of the protruding portion 111c is not along the X-axis in a plan view and has a shape having an angle. In the present embodiment, the protrusion 111c is formed in a substantially triangular shape, and all the outer edges of the protrusion 111c are not along the parallel side 112e in a plan view and are not along the X-axis.
- the protruding end (the end on the ⁇ Z'direction side) of the protruding portion 111d does not follow the parallel side 112g in a plan view, and has a shape having an angle. That is, the protruding end of the protruding portion 111d is not along the X-axis in a plan view and has a shape having an angle.
- the protrusion 111d is formed in a substantially triangular shape, and all the outer edges of the protrusion 111d are not along the parallel side 112g in a plan view and are not along the X-axis.
- the protruding portions 111c and 111d of the first excitation electrode 111 do not follow the parallel sides 112e and 112g in a plan view and have an outer edge shape that does not follow the X axis.
- Spurious caused by the outer edge shape of the first excitation electrode 111 can be reduced. That is, it is considered that spurious increases due to the portion of the outer edge shape of the first excitation electrode 111 along the X-axis. Therefore, in the present embodiment, the outer edges of the protruding portions 111c and 111d of the first excitation electrode 111 The shape is set so as not to follow the X-axis so as to reduce spurious caused by the outer edge shape of the first excitation electrode 111.
- spurious can be reduced and the electrical characteristics can be improved.
- an electromechanical connection point is directly connected to the vibrating portion 11 in the process after the vibrating portion 11 is formed. Since it is not formed, spurious is not generated due to the formation of the connection point. That is, while reducing spurious by the excitation electrodes 111 and 112, it is possible to suppress further spurious generation caused by the process after the formation of the vibrating portion 11. Further, in the vibrating portion 11 of the crystal diaphragm 10 with such a frame, the excitation electrodes 111 and 112 can be formed without considering the connection points, so that the degree of freedom in designing the excitation electrodes 111 and 112 is increased.
- a holding electrode for holding the crystal diaphragm 10 becomes unnecessary. Therefore, the installation space for the holding electrode is not required, and the centers of gravity (centers) 111a and 112a of the first and second excitation electrodes 111 and 112 can be brought closer to the center of the vibrating portion 11. Further, in this case, since only one holding portion 13 is provided on the crystal diaphragm 10, vibration leakage from the vibrating portion 11 to the outer frame portion 12 via the holding portion 13 can be suppressed as much as possible.
- the holding portion 13 is provided at the corner portion of the outer peripheral end portion of the vibrating portion 11 in which the displacement of the piezoelectric vibration is relatively small, the holding portion 13 is provided at a portion other than the corner portion (center portion of the side). Since it is possible to suppress the piezoelectric vibration from leaking to the outer frame portion 12 through the holding portion 13 and to more efficiently vibrate the vibrating portion 11 as compared with the case where the vibration portion 11 is provided in the above, the electrical characteristics Can be improved. Further, as compared with the case where two or more holding portions 13 are provided, the stress acting on the vibrating portion 11 can be reduced, and the frequency shift of the piezoelectric vibration caused by such stress is reduced to stabilize the piezoelectric vibration. The sex can be improved.
- the first excitation electrode 111 is arranged at an angle with respect to the second excitation electrode 112 in a plan view, spurious caused by the outer edge shape of the first excitation electrode 111 is reduced. be able to. That is, among the outer edge shapes of the first excitation electrode 111, it is considered that the spurious increases due to the portion along the outer edge shape of the second excitation electrode 112.
- the four sides of the first excitation electrode 111 The 111e, 111f, 111g, 111h are arranged at an angle with respect to the four sides 112e, 112f, 112g, 112h of the second excitation electrode 112 so as to reduce spurious caused by the outer edge shape of the first excitation electrode 111.
- spurious can be reduced and the electrical characteristics can be improved.
- an electromechanical connection point is directly connected to the vibrating portion 11 in the process after the vibrating portion 11 is formed. Since it is not formed, spurious is not generated due to the formation of the connection point. That is, while reducing spurious by the excitation electrodes 111 and 112, it is possible to suppress further spurious generation caused by the process after the formation of the vibrating portion 11. Further, in the vibrating portion 11 of the crystal diaphragm 10 with such a frame, the excitation electrodes 111 and 112 can be formed without considering the connection points, so that the degree of freedom in designing the excitation electrodes 111 and 112 is increased.
- the protruding portions 111c and 111d are provided at positions on both sides of the first exciting electrode 111 with the center of gravity 111a interposed therebetween, and the respective protruding portions 111c and 111d are provided with the second exciting electrode 112 in a plan view. Since it has an outer edge shape that does not follow the outer edge of the first excitation electrode 111 and does not follow the X-axis, spurious caused by the outer edge shape of the first excitation electrode 111 can be reduced. That is, it is considered that spurious increases due to the portion of the outer edge shape of the first excitation electrode 111 along the X-axis.
- the outer edges of the protruding portions 111c and 111d of the first excitation electrode 111 The shape is set so as not to follow the X-axis so as to reduce spurious caused by the outer edge shape of the first excitation electrode 111.
- the second excitation electrode 112 is formed in a rectangular shape and the first excitation electrode 111 is formed in a rhombus shape, all the outer edges (four sides 111e, 111f, 111g, 111h) of the first excitation electrode 111 are formed. In plan view, it does not follow the four sides 112e, 112f, 112g, 112h of the second excitation electrode 112, and does not follow the X axis. Thereby, spurious caused by the outer edge shape of the first excitation electrode 111 can be reduced more efficiently.
- the first and second excitation electrodes have conventionally been substantially the same shape (mainly rectangular). ), And were placed at positions that almost coincided with each other in a plan view.
- the frequency of the crystal diaphragm 10 can be adjusted by using the same mask and jig for the rectangular electrode as in the conventional case, which is advantageous for frequency adjustment.
- both ends of the first excitation electrode 111 in the Z'axis direction are provided.
- the projecting portions 111c and 111d provided in the above can be formed in a shape symmetrical with respect to the straight line L1 passing through the center of gravity 111a of the first excitation electrode 111 and parallel to the X axis (parallel sides 112e, 112g). Thereby, spurious generated due to the asymmetrical protrusions 111c and 111d of the first excitation electrode 111 can be reduced.
- the crystal vibrating plate is formed by performing, for example, an ion partial on the second excitation electrode 112 having a larger area.
- the frequency adjustment of 10 can be easily performed. That is, the second excitation electrode 112 having a larger area can be used as an electrode for frequency adjustment.
- the first and second excitation electrodes are substantially the same as described above. It was formed in a shape (mainly a rectangle) and was arranged at positions that substantially matched in plan view.
- the areas of the first and second excitation electrodes 111 and 112 different, it is possible to secure a region for frequency adjustment in the second excitation electrode 112 having a larger area, and it is possible to adjust the frequency of the crystal diaphragm 10. It will be advantageous. Further, when the area of the second excitation electrode 112 is smaller than the area of the first excitation electrode 111, the room temperature CI value of the crystal diaphragm 10 may become high, or the temperature change of the CI value may become unstable. There is. However, by making the area of the second excitation electrode 112 larger than the area of the first excitation electrode 111, the characteristics of the crystal diaphragm 10 (temperature characteristics of normal temperature CI value and CI value) can be maintained satisfactorily. ..
- first and second lead-out wirings 113 and 114 extend in the same direction, and one lead-out wiring is arranged so as to be offset from the other lead-out wiring in a plan view.
- vibration may occur at the overlapping portions of the first and second lead-out wirings 113 and 114, and vibration leakage to the outer frame portion 12 may occur. Therefore, by making the overlapping portion of the first and second drawer wirings 113 and 114 as small as possible, the vibration generated in the first and second drawer wirings 113 and 114 can be suppressed, and the outer frame portion 12 can be reached. Vibration leakage can be suppressed.
- the first and second lead-out wirings 113 and 114 extend from the corners (tops) of the first and second excitation electrodes 111 and 112 in the ⁇ Z'direction, the first and second extraction wires are 2
- the lead-out wirings 113 and 114 can be easily displaced and arranged. Further, since the first and second lead-out wirings 113 and 114 extend in the same direction, the first and second drawer wirings extend in different directions as compared with the case where the first and second lead-out wirings 113 and 114 extend in different directions.
- the wiring connected to 113, 114 and the first and second drawer wirings 113, 114 can be simplified, and complicated wiring becomes unnecessary, which contributes to the miniaturization of the crystal diaphragm 10.
- the first main surface 101 of the crystal diaphragm 10 is provided with the first excitation electrode 111 formed in a diamond shape, and the second excitation electrode 102 formed in a rectangular shape on the second main surface 102 of the crystal diaphragm 10 is provided.
- a first excitation electrode 111 formed in a rectangular shape is provided on the first main surface 101 of the crystal diaphragm 10
- a diamond-shaped second excitation electrode 111 is provided on the second main surface 102 of the crystal diaphragm 10.
- 112 may be provided.
- the protruding portions provided at both ends of the second excitation electrode 112 in the Z'axis direction may have an outer edge shape that is not along the parallel side of the first excitation electrode 111 in a plan view.
- the shape of the first excitation electrode 111 may be other than a rhombus, and may be, for example, a rectangle, a parallelogram, an ellipse, an oval, a hexagon, an octagon, or the like.
- the shape of the second excitation electrode 112 may be other than a rectangle, and may be, for example, a parallelogram, an ellipse, an oval, a hexagon, an octagon, or the like.
- the shapes of the protruding portions 111c and 111d of the first excitation electrode 111 may be other than triangular, and may be, for example, semicircular.
- the center of gravity 111a of the first excitation electrode 111 and the center of gravity 112a of the second excitation electrode 112 may not substantially coincide with each other in a plan view.
- the first excitation electrode 111 does not have to be formed in a shape symmetrical with respect to the straight line L1 passing through the center of gravity 111a of the first excitation electrode 111 and parallel to the X axis.
- the second excitation electrode 112 does not have to be formed in a shape symmetrical with respect to the straight line L2 passing through the center of gravity 112a of the second excitation electrode 112 and parallel to the X axis.
- the protruding end of the protruding portion 111c of the first excitation electrode 111 does not have to be along the parallel side 112e and along the X axis in a plan view, and all the outer edges of the protruding portion 111c are in a plan view. It does not have to be along the parallel side 112e.
- the protruding end of the protruding portion 111d of the first excitation electrode 111 does not have to be along the parallel side 112g in the plan view and is not along the X axis, and all the outer edges of the protruding portion 111d are parallel in the plan view. It does not have to be along the side 112g.
- the protruding ends of the protruding portions 111c and 111d of the first excitation electrode 111 may have an R shape.
- the parallel sides 112e and 112g of the second excitation electrode 112 do not have to be parallel to the X axis.
- Protrusions may be provided on only one of both ends of the first excitation electrode 111 in the Z'axis direction. Three or more protruding portions of the first excitation electrode 111 may be provided. In these cases, the protruding end of the protruding portion of the first excitation electrode 111 may have an outer edge shape that is not along the parallel side of the second excitation electrode 112 in a plan view and is not along the X axis.
- the four sides 111e, 111f, 111g, 111h of the first excitation electrode 111 are arranged at an angle with respect to the four sides 112e, 112f, 112g, 112h of the second excitation electrode 112, and have protruding portions 111c, 111d.
- the first and second excitation electrodes 111 and 112 have the same shape (for example, square, rhombus, elliptical, etc.), and one of the first and second excitation electrodes 111 and 112 has the other excitation electrode.
- the shape may be rotated around the center of gravity 111a of the first excitation electrode 111 with respect to the excitation electrode of.
- first and second excitation electrodes 111 and 112 may be square, and the first excitation electrode 111 may be rotated with respect to the second excitation electrode 112 around the center of gravity 111a of the first excitation electrode 111.
- the first and second excitation electrodes 111 and 112 may have similar shapes to each other.
- first and second excitation electrodes 111 and 112 have the same shape (for example, square, rhombus, ellipse, etc.), and one of the first and second excitation electrodes 111 and 112 is used as the other excitation electrode.
- the shape may be expanded or contracted (enlarged or contracted) in the X-axis direction or the Z'axis direction.
- first and second lead-out wirings 113 and 114 do not have to completely overlap each other in a plan view.
- the first and second lead-out wires 113 and 114 may extend in different directions from each other. Further, in the above embodiment, the first and second lead-out wirings 113 and 114 extend from the corners (tops) of the first and second excitation electrodes 111 and 112, but the present invention is not limited to this.
- the two lead-out wirings 113 and 114 may extend from the intermediate portion of any one of the four sides of the first and second excitation electrodes 111 and 112.
- the crystal diaphragm 10 may be provided with two or more holding portions 13 for connecting the vibrating portion 11 and the outer frame portion 12.
- the present invention is not limited to this, and the present invention may be applied to, for example, a crystal oscillator.
- the first sealing member 20 and the second sealing member 30 are formed of a quartz plate, but the present invention is not limited to this, and the first sealing member 20 and the second sealing member 30 are formed.
- it may be formed of glass.
- Crystal diaphragm (piezoelectric diaphragm) 11 Vibration part 12 Outer frame part 13 Holding part 20 First sealing member 30 Second sealing member 100 Crystal oscillator (piezoelectric vibration device) 111 First excitation electrode (one excitation electrode) 111a Center of gravity 111c, 111d Protruding part 112 Second excitation electrode (the other excitation electrode) 112a Center of gravity 112e, 112g Parallel sides L1, L2 Straight line
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Electrophonic Musical Instruments (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
11 振動部
12 外枠部
13 保持部
20 第1封止部材
30 第2封止部材
100 水晶振動子(圧電振動デバイス)
111 第1励振電極(一方の励振電極)
111a 重心
111c,111d 突出部
112 第2励振電極(他方の励振電極)
112a 重心
112e,112g 平行辺
L1,L2 直線
Claims (11)
- 厚みすべり振動にて動作する圧電振動板であって、
振動部と、当該振動部の外周を取り囲む外枠部と、前記振動部と前記外枠部とを連結する保持部とを備え、前記振動部と前記外枠部との間には、当該圧電振動板を切り抜いて形成された切り抜き部が設けられ、
前記振動部の一主面に第1励振電極が形成され、前記振動部の他主面に前記第1励振電極と対になる第2励振電極が形成され、
前記第1励振電極および前記第2励振電極のうち一方の励振電極には、他方の励振電極に対し、平面視で突出する突出部が少なくとも1つ設けられ、
前記他方の励振電極は、互いに平行な平行辺を少なくとも1つ有し、
前記突出部は、平面視で前記平行辺の間の部分よりも外側へ向けて突出されており、かつ平面視で前記平行辺に沿っていない外縁形状を有していることを特徴とする圧電振動板。 - 厚みすべり振動にて動作する圧電振動板であって、
振動部と、当該振動部の外周を取り囲む外枠部と、前記振動部と前記外枠部とを連結する保持部とを備え、前記振動部と前記外枠部との間には、当該圧電振動板を切り抜いて形成された切り抜き部が設けられ、
前記振動部の一主面に第1励振電極が形成され、前記振動部の他主面に前記第1励振電極と対になる第2励振電極が形成され、
前記第1励振電極および前記第2励振電極は、ともに当該圧電振動板のX軸に平行な直線に対して線対称な形状に形成されており、
前記第1励振電極および前記第2励振電極のうち一方の励振電極には、他方の励振電極に対し、平面視で重なり合わず外側へ向けて突出する突出部が少なくとも1つ設けられ、
前記突出部は、平面視でX軸に沿っていない外縁形状を有していることを特徴とする圧電振動板。 - 請求項1または2に記載の圧電振動板において、
前記一方の励振電極の重心と、前記他方の励振電極の重心とが、平面視で略一致する位置に設けられていることを特徴とする圧電振動板。 - 厚みすべり振動にて動作する圧電振動板であって、
振動部と、当該振動部の外周を取り囲む外枠部と、前記振動部と前記外枠部とを連結する保持部とを備え、前記振動部と前記外枠部との間には、当該圧電振動板を切り抜いて形成された切り抜き部が設けられ、
前記振動部の一主面に第1励振電極が形成され、前記振動部の他主面に前記第1励振電極と対になる第2励振電極が形成され、
前記第1励振電極の重心と、前記第2励振電極の重心とが、平面視で略一致する位置に設けられ、
前記第1励振電極および前記第2励振電極のうち一方の励振電極は、他方の励振電極に対し、平面視で傾けて配置されていることを特徴とする圧電振動板。 - 請求項4に記載の圧電振動板において、
前記一方の励振電極には、前記他方の励振電極に対し、平面視で重なり合わず外側へ向けて突出する突出部が、前記第1励振電極の重心を挟んだ両側の位置にそれぞれ設けられ、それぞれの突出部が、平面視で前記他方の励振電極の外縁に沿っていない外縁形状を有していることを特徴とする圧電振動板。 - 請求項1~5のいずれか1つに記載の圧電振動板において、
前記他方の励振電極の面積は、前記一方の励振電極の面積よりも大きいことを特徴とする圧電振動板。 - 請求項1~6のいずれか1つに記載の圧電振動板において、
前記保持部の一主面には、前記第1励振電極に接続する第1引出配線が形成され、
前記保持部の他主面には、前記第2励振電極に接続する第2引出配線が形成され、
前記第1引出配線および前記第2引出配線が、同じ方向に延びていることを特徴とする圧電振動板。 - 請求項7に記載の圧電振動板において、
前記第1引出配線および前記第2引出配線のうち一方の引出配線は、他方の引出配線に対し、平面視でずらして配置されていることを特徴とする圧電振動板。 - 請求項1~8のいずれか1つに記載の圧電振動板において、
前記一方の励振電極は、菱形に形成され、
前記他方の励振電極は、矩形に形成されていることを特徴とする圧電振動板。 - 請求項1~9のいずれか1つに記載の圧電振動板において、
前記保持部は、1つのみ設けられていることを特徴とする圧電振動板。 - 請求項1~10のいずれか1つに記載の圧電振動板を備えた圧電振動デバイスであって、
前記圧電振動板の前記第1励振電極を覆う第1封止部材と、
前記圧電振動板の前記第2励振電極を覆う第2封止部材とが備えられ、
前記第1封止部材と前記圧電振動板とが接合され、かつ前記第2封止部材と前記圧電振動板とが接合されることによって、前記圧電振動板の前記振動部が気密封止されることを特徴とする圧電振動デバイス。
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| US17/608,153 US12316301B2 (en) | 2019-05-31 | 2020-05-28 | Piezoelectric resonator plate and piezoelectric resonator device |
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| JP2011160094A (ja) * | 2010-01-29 | 2011-08-18 | Daishinku Corp | 圧電振動片 |
| JP2017153033A (ja) * | 2016-02-26 | 2017-08-31 | 株式会社大真空 | 水晶振動板、及び水晶振動デバイス |
| WO2018042994A1 (ja) * | 2016-08-30 | 2018-03-08 | 株式会社大真空 | 水晶振動板、及び水晶振動デバイス |
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| US8164235B2 (en) * | 2007-08-03 | 2012-04-24 | Daishinku Corporation | Piezoelectric resonator |
| WO2010074127A1 (ja) | 2008-12-24 | 2010-07-01 | 株式会社大真空 | 圧電振動デバイス、圧電振動デバイスの製造方法、および圧電振動デバイスを構成する構成部材のエッチング方法 |
| JP5262946B2 (ja) | 2009-04-15 | 2013-08-14 | セイコーエプソン株式会社 | 電子デバイス |
| JP5362643B2 (ja) * | 2009-06-30 | 2013-12-11 | 日本電波工業株式会社 | 積層型の水晶振動子 |
| US8963402B2 (en) * | 2010-11-30 | 2015-02-24 | Seiko Epson Corporation | Piezoelectric vibrator element, piezoelectric module, and electronic device |
| US8970316B2 (en) * | 2011-08-19 | 2015-03-03 | Seiko Epson Corporation | Resonating element, resonator, electronic device, electronic apparatus, and mobile object |
| JP2018032944A (ja) | 2016-08-23 | 2018-03-01 | 株式会社大真空 | 水晶振動板、及び水晶振動デバイス |
| JP6794941B2 (ja) | 2017-06-28 | 2020-12-02 | 株式会社大真空 | 水晶振動板および水晶振動デバイス |
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2020
- 2020-05-28 WO PCT/JP2020/021219 patent/WO2020241790A1/ja not_active Ceased
- 2020-05-28 CN CN202080035322.3A patent/CN113812088A/zh active Pending
- 2020-05-28 JP JP2021522885A patent/JP7283538B2/ja active Active
- 2020-05-28 US US17/608,153 patent/US12316301B2/en active Active
- 2020-05-29 TW TW109118111A patent/TWI784278B/zh active
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| JPS514867B2 (ja) * | 1971-07-28 | 1976-02-16 | ||
| JP2011160094A (ja) * | 2010-01-29 | 2011-08-18 | Daishinku Corp | 圧電振動片 |
| JP2017153033A (ja) * | 2016-02-26 | 2017-08-31 | 株式会社大真空 | 水晶振動板、及び水晶振動デバイス |
| WO2018042994A1 (ja) * | 2016-08-30 | 2018-03-08 | 株式会社大真空 | 水晶振動板、及び水晶振動デバイス |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2024011872A (ja) * | 2022-07-15 | 2024-01-25 | 株式会社大真空 | 圧電振動板 |
| JP7782381B2 (ja) | 2022-07-15 | 2025-12-09 | 株式会社大真空 | 圧電振動板 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7283538B2 (ja) | 2023-05-30 |
| TW202103444A (zh) | 2021-01-16 |
| CN113812088A (zh) | 2021-12-17 |
| US20220294418A1 (en) | 2022-09-15 |
| JPWO2020241790A1 (ja) | 2020-12-03 |
| TWI784278B (zh) | 2022-11-21 |
| US12316301B2 (en) | 2025-05-27 |
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