WO2016121182A1 - 水晶振動板、及び水晶振動デバイス - Google Patents
水晶振動板、及び水晶振動デバイス Download PDFInfo
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- WO2016121182A1 WO2016121182A1 PCT/JP2015/080667 JP2015080667W WO2016121182A1 WO 2016121182 A1 WO2016121182 A1 WO 2016121182A1 JP 2015080667 W JP2015080667 W JP 2015080667W WO 2016121182 A1 WO2016121182 A1 WO 2016121182A1
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- 239000013078 crystal Substances 0.000 title claims abstract description 203
- 230000010355 oscillation Effects 0.000 title abstract description 9
- 230000005284 excitation Effects 0.000 claims abstract description 60
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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 devices; Electromechanical resonators
- H03H9/02—Details
-
- 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
- H03H9/0595—Holders; Supports the holder support and resonator being formed in one body
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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 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
- H03H9/1035—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 devices; 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
-
- 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
- H03H9/17—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
Definitions
- the present invention relates to an AT-cut type crystal diaphragm including a first excitation electrode formed on one main surface and a second excitation electrode formed on another main surface, and a crystal including the crystal vibration plate.
- the present invention relates to a vibration device.
- Patent Document 1 discloses a piezoelectric vibrator including a piezoelectric vibrating piece provided with an excitation electrode, a support frame disposed around the piezoelectric vibrating piece, and a connecting portion that connects the support frame and the piezoelectric vibrating piece.
- the connecting part is composed of a first connecting part and a second connecting part, which are connected to the corner of the vibrating part from two corners on the ⁇ X direction side of the support frame, respectively, and one end in the ⁇ X direction is cantilevered.
- Patent Documents 2 and 3 are known as AT-cut type crystal resonators in which the vibration mode of the main vibration is thickness-shear vibration, suitable for miniaturization and higher frequency, and excellent in frequency temperature characteristics.
- the AT-cut type crystal resonator is obtained by rotating the artificial quartz crystal by 35 ° 15 ′ around the X axis when the X axis, the Y axis, and the Z axis are used.
- the axis rotated 35 ° 15 ′ from the Y axis is defined as the Y ′ axis
- the axis rotated 35 ° 15 ′ from the Z axis is defined as the Z ′ axis.
- Patent Document 2 discloses a crystal resonator including a vibration unit 300 provided with an excitation electrode 200, a frame unit 500 that surrounds the periphery of the vibration unit 300, and a connection unit 400 that connects the frame unit 500 and the vibration unit 300.
- the connecting portion 400 is connected to the frame portion 500 at three corners and six central portions (6 on both sides) on one side of the vibrating portion 300 along the X-axis direction in the crystal axis of the crystal.
- a quartz resonator 100 is disclosed (see FIG. 15).
- a vibration part having an excitation electrode formed on the main surface, a frame part disposed on the outer peripheral side of the vibration part via a through groove, and the vibration part and the frame part are connected.
- a piezoelectric vibrating piece having a supporting portion that is provided with sawtooth notches on the front and back surfaces along the width direction of the supporting portion.
- JP 2011-91173 A Japanese Patent Publication No. 6-83011 JP 2007-214942 A
- FIG. 15 is a plan view of a conventional quartz diaphragm
- FIG. 16A is an explanatory diagram for explaining the vibration excursion of the quartz diaphragm
- FIG. 15B shows a charge distribution in the X-axis direction of the quartz diaphragm
- the graph (c) is a graph showing the charge distribution in the Z′-axis direction of the crystal diaphragm.
- the horizontal axis indicates the position of the crystal diaphragm
- the vertical axis indicates the amount of charge at the position.
- the electric charge distribution in the X-axis direction of the crystal diaphragm is distributed in the center position of the crystal diaphragm.
- FIG. 16C it can be seen that in the Z′-axis direction of the quartz diaphragm, the charge distribution tends to decrease slightly toward both ends of the quartz diaphragm, but is substantially constant. From this result, it can be seen that when a voltage is applied to the crystal diaphragm to cause piezoelectric vibration, the displacement of the piezoelectric vibration in the central portion where more charges are distributed is large in the X-axis direction. On the other hand, since the electric charge is distributed substantially in the Z′-axis direction, it can be seen that the displacement of the piezoelectric vibration is constant.
- the present invention has been made in view of the above points, and an object of the present invention is to provide an AT-cut type crystal diaphragm having high piezoelectric vibration efficiency and capable of efficiently performing piezoelectric vibration, and the crystal diaphragm.
- An object of the present invention is to provide a crystal vibration device having the above-described structure.
- the present invention is configured as follows.
- a quartz crystal plate according to the present invention is an AT-cut type crystal plate provided with a first excitation electrode formed on one main surface and a second excitation electrode formed on another main surface, A substantially rectangular vibration part provided with the first excitation electrode and the second excitation electrode, a holding part protruding from the corner part of the vibration part in the Z′-axis direction of the AT cut, and the vibration part And an outer frame portion that surrounds the outer periphery and holds the holding portion.
- the quartz crystal diaphragm of this invention is the conventional quartz crystal diaphragm Unlike the above, the vibrating part is not held at the center position of the side along the X-axis direction. Therefore, when the quartz diaphragm is vibrated piezoelectrically, it can be vibrated efficiently.
- the first excitation electrode and the second excitation electrode are formed at a position away from a region on an extension line extending the holding portion in the Z′-axis direction toward the center direction of the vibration portion.
- the configuration is as follows.
- the piezoelectric vibration of the quartz crystal plate is transmitted to the outer frame through the holding portion. It is possible to prevent leakage to the part and confine the piezoelectric vibration of the crystal diaphragm in the vibration part.
- the above-described quartz diaphragm may be configured such that the holding portion protrudes from the two corners of the vibrating portion on the Z ′ axis toward the outer frame portion.
- the vibration part of the crystal diaphragm is held by the outer frame part via the holding part from the two corners on the Z ′ axis, the vibration part can be reliably held. Furthermore, since the wiring patterns of the first excitation electrode and the second excitation electrode formed on each main surface of the crystal diaphragm can be independently arranged by the holding portions protruding from the two corners, Parasitic capacitance can be suppressed, and the frequency variable amount can be prevented from being reduced.
- the holding portion may be configured to protrude from only one corner portion of the vibrating portion toward the outer frame portion.
- the vibration part of the crystal diaphragm is held by the outer frame part via the holding part protruding toward the outer frame part from only one corner part, the number of holding parts can be reduced. Furthermore, vibration leakage to the outer frame portion can be prevented. In addition, since the degree of stress can be reduced as compared with the case where the number of the holding parts is two, the frequency shift due to the stress can be reduced, and the crystal diaphragm can be stably piezoelectrically vibrated.
- the outer frame portion is thicker than the holding portion.
- the natural frequency of the piezoelectric vibration of the outer frame part and the holding part differs depending on the thickness of the outer frame part and the thickness of the holding part.
- the outer frame portion is less likely to resonate with vibration.
- the thickness of the central region of the vibration part is made thicker than the surrounding area at the position where the first excitation electrode and the second excitation electrode are formed in the vibration part. It is good also as a structure in which the mesa structure is formed.
- the mesa structure is formed at the position where the first excitation electrode and the second excitation electrode are formed in the vibration part, and the thickness of the portion to be subjected to piezoelectric vibration is different, so the frequency of piezoelectric vibration is different. Therefore, since boundaries having different frequencies can be formed, the effect of confining piezoelectric vibration is enhanced, and leakage of piezoelectric vibration can be prevented by confining piezoelectric vibration.
- At least one of the vibrating part and the holding part is provided with a groove, and the groove is inclined toward the center part side of the vibrating part with respect to the X axis of the AT cut. It is good also as the structure currently made.
- the piezoelectric vibration can be confined in the vibration part.
- the groove includes one or a plurality of first grooves formed on one main surface side of the vibration unit, and one or a plurality of first grooves formed on the other main surface side of the vibration unit.
- the first groove and the second groove may be alternately arranged from the vibration part side to the outer frame part of the vibration part.
- the first groove and the second groove are alternately arranged from the vibrating portion side of the holding portion to the outer frame portion, the confinement effect of piezoelectric vibration can be improved.
- a quartz crystal vibrating device includes the above quartz crystal plate, a first sealing member that covers the one main surface of the crystal plate, and a second sealing member that covers the other main surface of the crystal plate. And is provided.
- the outer frame portion has a recess at a position connected to the holding portion on at least one of the one main surface side and the other main surface side, and the outer frame
- the thickness of the portion, the thickness of the concave portion, and the thickness of the holding portion may satisfy the relationship of (thickness of the outer frame portion)> (thickness of the concave portion) ⁇ (thickness of the holding portion).
- the quartz vibrating device when an impact or the like is applied to the quartz vibrating device, stress concentration at the connection portion between the outer frame portion and the holding portion can be avoided or alleviated by the recess, and the impact resistance of the quartz vibrating device is improved. be able to. Furthermore, vibration leakage from the vibrating portion to the outer frame portion can be suppressed by the concave portion.
- the vibration leaking from the vibration part can be considered as a route that leaks to the outer frame part through the holding part, but if there is a concave part where it passes from the holding part to the outer frame part, it will not resonate with the outer frame part there. Can be adjusted to be difficult to be transmitted to the outer frame.
- the recess may be formed on both the one main surface and the other main surface.
- the impact resistance of the quartz crystal vibrating device can be further improved by forming the concave portions on both main surfaces.
- the above-described quartz diaphragm may be configured such that the bottom surface of the recess is formed to be flush with the surface of the holding portion.
- the above-described quartz diaphragm may be configured such that the bottom surface of the recess is formed with a step between the surface of the holding portion.
- a step remains at the connection portion between the outer frame portion and the holding portion, but a step also occurs at the boundary between the recess forming region and the other region in the outer frame portion.
- the width direction is a direction perpendicular to the protruding direction of the holding portion from the outer frame portion when viewed from the direction perpendicular to the main surface of the outer frame portion,
- the width may be wider than the width of the holding portion.
- the inner wall surface of the recess may have a shape having a curvature when viewed from a direction perpendicular to the main surface of the outer frame portion.
- the inner wall surface of the recess can have a shape with no apex, and stress concentration at the apex can be avoided.
- an AT-cut type crystal vibrating plate that has high piezoelectric vibration efficiency and can efficiently perform piezoelectric vibration, and a crystal vibrating device including the crystal vibrating plate.
- FIG. 1 is a schematic configuration diagram showing each configuration of an embodiment of a crystal resonator according to the present invention.
- FIG. 2 is a schematic plan view of the first sealing member of the crystal resonator according to the present embodiment.
- FIG. 3 is a schematic bottom view of the first sealing member of the crystal resonator according to the present embodiment.
- FIG. 4A is a schematic plan view of the first embodiment of the crystal diaphragm according to the present invention.
- FIG. 4B is a schematic plan view of another example of the first embodiment of the crystal diaphragm according to the present invention.
- FIG. 5 is a schematic bottom view of the first embodiment of the crystal diaphragm according to the present invention.
- 6A is a cross-sectional view taken along line AA shown in FIG. 4A.
- FIG. 6B is a cross-sectional view taken along the line BB shown in FIG. 4B.
- FIG. 6C is a cross-sectional view of another example of the quartz crystal diaphragm according to the present invention.
- FIG. 7 is a schematic plan view of the second sealing member of the crystal resonator according to the present embodiment.
- FIG. 8 is a schematic bottom view of the second sealing member of the crystal resonator according to the present embodiment.
- FIG. 9 is a schematic plan view of a first modification of the first embodiment of the crystal diaphragm according to the present invention.
- FIG. 10 is a schematic plan view of a second modification of the first embodiment of the crystal diaphragm according to the present invention.
- FIG. 11 is a schematic plan view of a third modification of the first embodiment of the crystal diaphragm according to the present invention.
- FIG. 12 is a schematic plan view of a fourth modification of the first embodiment of the crystal diaphragm according to the present invention.
- 13 is a cross-sectional view taken along the line cc shown in FIG.
- FIG. 14 is a schematic plan view of the second embodiment of the crystal diaphragm according to the present invention.
- FIG. 15 is a plan view of a conventional quartz diaphragm.
- FIG. 16A is an explanatory diagram for explaining the vibration displacement of the crystal diaphragm
- FIG. 16B is a graph showing the charge distribution in the X-axis direction on the crystal axis of the crystal diaphragm
- FIG. 16A is an explanatory diagram for explaining the vibration displacement of the crystal diaphragm
- FIG. 16B is a graph showing the charge distribution in the X-axis direction on the crystal axis of the
- FIG. 4 is a graph showing the charge distribution in the Z-axis direction on the crystal axis of the crystal diaphragm.
- FIG. 17 is a schematic plan view of a crystal diaphragm according to a third embodiment of the present invention.
- FIG. 18A is a perspective view showing a connection structure between the holding part and the outer frame part when the outer frame part is not provided with a concave part, and
- FIG. 18B shows the bottom surface of the concave part and the surface of the holding part.
- FIG. 19A is a plan view showing a modification of the recess shape
- FIG. 19B is a plan view showing another modification of the recess shape.
- FIG. 20 is a plan view showing the quartz plate after the outer shape forming etching is performed on the upper portion of the drawing, and the AA sectional view of the lower portion thereof.
- FIG. 21A is a plan view showing the quartz plate after the mesa formation etching is performed on the upper part of the drawing, and the lower part is a cross-sectional view taken along the line AA.
- FIG. 21B is a plan view showing the quartz plate after the mesa formation etching is performed on the upper part thereof, and the lower part thereof is a cross-sectional view taken along the line AA.
- FIG. 22A is a plan view showing the quartz plate after the frequency adjustment etching is performed in the upper part of the figure, and the lower part is a cross-sectional view taken along the line AA.
- FIG. 22B is a plan view showing the quartz plate after the frequency adjustment etching is performed on the upper part of the figure, and the AA sectional view thereof is shown on the lower part.
- FIG. 23 is a plan view showing the crystal plate after the frequency adjustment etching is performed on the upper part of the drawing, and the lower part is a cross-sectional view taken along the line AA.
- FIG. 1 is a schematic configuration diagram illustrating each configuration of an embodiment of a crystal resonator.
- the portions corresponding to the electrodes are hatched. Further, in the cross-sectional views described later, from the viewpoint of easy viewing of the drawings, the portions corresponding to the electrodes are hatched and the other portions are not hatched.
- the crystal resonator device 1 is, for example, a crystal resonator, and includes a crystal resonator plate 2, a first sealing member 3 that hermetically seals the main surface 2a of the crystal resonator plate 2, and a crystal And a second sealing member 4 that covers the other main surface 2b of the diaphragm 2 and hermetically seals.
- the crystal vibrating plate 2 and the first sealing member 3 are joined, and the crystal vibrating plate 2 and the second sealing member 4 are joined.
- the internal space 13 between the first sealing member 3 and the crystal vibrating plate 2 and the internal space 13 between the crystal vibrating plate 2 and the second sealing member 4 are hermetically sealed.
- the sandwiched package 12 is formed (see FIG. 1).
- the package size of the quartz crystal vibrating device 1 is 1.0 ⁇ 0.8 mm, which is intended to reduce size and height.
- the package 12 does not form a castellation and uses the through-holes (first through-hole h1, second through-hole h2, and third through-hole h3) described later to conduct the electrodes. I am trying.
- the internal space 13 is biased toward one end side (left side in plan view) of the package 12 in plan view.
- FIG. 2 is a schematic plan view of the first sealing member
- FIG. 3 is a schematic bottom view of the first sealing member.
- the first sealing member 3 is made of a material having a bending rigidity (secondary moment of section ⁇ Young's modulus) of 1000 [N ⁇ mm 2 ] or less. Specifically, as shown in FIGS. 2 and 3, the first sealing member 3 is a rectangular parallelepiped substrate formed from one glass wafer or quartz wafer, with one main surface 3 a side as the upper surface, and the other The main surface 3b (surface joined to the crystal diaphragm 2) is formed as a flat smooth surface (mirror finish).
- the other main surface 3 b of the first sealing member 3 is provided with a sealing-side first bonding pattern 31 for bonding to the quartz crystal plate 2 so as to surround the internal space 13.
- the sealing-side first bonding pattern 31 is biased to the left of the other main surface 3 b of the first sealing member 3 in plan view.
- the line width of the sealing-side first bonding pattern 31 is the same at all positions.
- the sealing-side first bonding pattern 31 was formed by stacking a base PVD film formed by physical vapor deposition on the first sealing member 3 and a physical vapor deposition on the base PVD film. It consists of an electrode PVD film. In this embodiment, Ti (or Cr) is used for the base PVD film, and Au is used for the electrode PVD film. Moreover, the sealing side 1st joining pattern 31 is a non-Sn pattern.
- FIGS. 4A is a schematic plan view of the first embodiment of the crystal diaphragm
- FIG. 4B is a schematic plan view of another example of the first embodiment of the crystal diaphragm
- FIG. 5 is a first embodiment of the crystal diaphragm
- 6A is a cross-sectional view taken along the line AA shown in FIG. 4A
- FIG. 6B is a cross-sectional view taken along the line BB shown in FIG. 4B
- FIG. 6C is another example of the crystal diaphragm.
- the crystal diaphragm 2 is an AT-cut type crystal that is processed by rotating a rectangular crystal plate by 35 ° 15 ′ around the X axis that is the crystal axis of the crystal.
- the holding part 22 and the outer frame part 23 are provided (see FIGS. 4A and 5).
- the crystal axes of the artificial quartz are the X axis, the Y axis, and the Z axis, and the Y axis and the Z axis of the AT cut type crystal rotated by 35 ° 15 ′ around the X axis, The Y ′ axis and the Z ′ axis are assumed.
- a cut-out portion formed by cutting out a rectangular crystal plate is provided, and the cut-out portion is constituted by a plan view reverse concave body k1 and a plan view rectangular body k2.
- the quartz diaphragm 2 is made of quartz which is a piezoelectric material, and both principal surfaces (one principal surface 2a and the other principal surface 2b) are flat and smooth surfaces (mirror finish).
- the vibrating unit 21 is a substantially rectangular shape that piezoelectrically vibrates when a voltage is applied.
- the shape of the vibration part 21 may not be a right angle by chamfering a corner
- a first excitation electrode 211 and a second excitation electrode 212 for applying a voltage to the vibration part 21 are formed on one main surface 2a and the other main surface 2b of the vibration part 21, respectively.
- a mesa structure 213 is formed in which the thickness of the central area of the vibration part 21 is thicker than the surrounding area. (See FIG. 6A). In this case, in the mesa structure 213, since the thickness of the crystal diaphragm 2 at the center is thick, the confinement effect of piezoelectric vibration can be improved.
- the first excitation electrode 211 and the second excitation electrode 212 are formed at positions away from the region on the extension line obtained by extending the holding portion 22 described later in the Z′-axis direction toward the center direction of the vibration portion 21. Thereby, since the first excitation electrode 211 and the second excitation electrode 212 are not formed on the line extending the holding portion 22 in the Z′-axis direction, the region where the crystal vibrating plate 2 vibrates piezoelectrically and the holding portion 22 The distance between them can be relatively long. Thereby, it is possible to prevent the piezoelectric vibration of the crystal vibrating plate 2 from leaking to the outer frame portion 23 through the holding portion 22, and to confine the piezoelectric vibration of the crystal vibrating plate 2 in the vibrating portion 21.
- the first excitation electrode 211 and the second excitation electrode 212 are formed by physical vapor deposition on the underlying PVD film (Ti or Cr) formed by physical vapor deposition on the vibrating portion 21 and the underlying PVD film.
- the electrode PVD film (Au) is formed by lamination.
- the first excitation electrode 211 and the second excitation electrode 212 are drawn out of the vibrating portion 21 by the holding portions 22 and 22 in which the first extraction electrode 214 or the second extraction electrode 215 from which the electrodes are extracted are formed.
- the first lead electrode 214 is drawn from the corner portion of the first excitation electrode 211 on the one main surface 2a side, and the first lead electrode on the one main surface 2a side is on the other main surface 2b side.
- the second extraction electrode 215 is extracted from the corner portion of the second excitation electrode 212 so as to be opposite to the direction in which 214 is extracted (see FIG. 6A).
- the holding portions 22 and 22 protrude from the corner portion of the rectangular vibration portion 21 in the Z′-axis direction of AT cut.
- the holding portions 22 and 22 protrude from the two corner portions 21a on the Z ′ axis in the vibrating portion 21 toward the outer frame portion 23 (see FIGS. 4A and 5).
- the first excitation electrode 211 is drawn out by the holding part 22 on the left side ( ⁇ Z ′ axis direction side) in plan view
- the second excitation electrode 212 is drawn out by the holding part 22 on the right side (+ Z ′ axis direction side) in plan view. It is.
- the outer frame portion 23 surrounds the outer periphery of the vibration portion 21 and holds the holding portion 22.
- a vibration-side first bonding pattern 216 for bonding to the first sealing member 3 is formed on the one main surface 2a, and a vibration-side second bonding for bonding to the second sealing member 4 is bonded to the other main surface 2b.
- a pattern 217 is formed. As shown in FIG. 1, the vibration-side first bonding pattern 216 and the vibration-side second bonding pattern 217 are arranged so as to be biased to the left in plan view of both the main surfaces 2a and 2b.
- the vibration side first bonding pattern 216 and the vibration side second bonding pattern 217 are physically formed on the base PVD film (Ti or Cr) formed by physical vapor deposition on the outer frame portion 23 and on the base PVD film. It consists of an electrode PVD film (Au) formed by vapor deposition and has a non-Sn pattern. That is, the same material as the first excitation electrode 211 and the second excitation electrode 212 is used.
- the vibration side first bonding pattern 216 and the vibration side second bonding pattern 217 may be made of an electrode material different from the first excitation electrode 211 and the second excitation electrode 212.
- a first through hole h1 is formed for drawing out the vibration side first bonding pattern 216 connected to the first excitation electrode 211 to the other main surface 2b side.
- the first through-hole h1 is disposed outside the internal space 13, and is located on the other end side in plan view (right side in plan view) of both the main surfaces 2a and 2b as shown in FIG. h ⁇ b> 1 is not formed inside the internal space 13.
- the inside of the internal space 13 means strictly the inside of the inner peripheral surface of the bonding material 11 without including the bonding material 11 (vibration side first bonding pattern 216).
- the thickness of the outer frame portion 23 is thicker than the thickness of the holding portion 22 (see FIG. 6A).
- the natural frequency of the piezoelectric vibration of the outer frame portion 23 and the holding portion 22 differs depending on the thickness of the outer frame portion 23 and the thickness of the holding portion 22. Is less likely to resonate.
- the space between the piezoelectric diaphragm 2 and the first sealing member 3 and the space between the piezoelectric diaphragm 2 and the second sealing member 4 can be widened, and the vibration portion 21 of the piezoelectric diaphragm 2 can be widened. And the contact between the first sealing member 3 and the second sealing member 4 can be prevented.
- piezoelectric vibration hardly propagates from a thick part to a thin part, and has an effect of blocking the piezoelectric vibration.
- the thickness of the holding portion 22 may be thicker than the thickness of the vibrating portion 21.
- unnecessary vibration including the holding unit 22 may not be considered in the piezoelectric vibration of the vibrating unit 21.
- the thickness of the holding portion 22 may be made thinner than the thickness of the mesa structure 213 of the vibrating portion 21.
- the vibration of the holding portion 22 and the vibration of the vibrating portion 21 are difficult to resonate, and the vibration energy of the vibrating portion 21 is transmitted to the holding portion. Loss can be effectively prevented.
- FIG. 7 is a schematic plan view of the second sealing member of the crystal resonator
- FIG. 8 is a schematic bottom view of the second sealing member of the crystal resonator.
- the second sealing member 4 a material having a bending rigidity (secondary moment of section ⁇ Young's modulus) of 1000 [N ⁇ mm 2 ] or less is used.
- the second sealing member 4 is a rectangular parallelepiped substrate formed from one glass wafer or quartz wafer, and one main surface 4 a of the second sealing member 4. (Surface bonded to the quartz diaphragm 2) is formed as a flat smooth surface (mirror finish).
- a sealing-side second bonding pattern 41 for bonding to the crystal diaphragm 2 is provided so as to surround the internal space 13. As shown in FIGS. 1 and 7, the sealing-side second bonding pattern 41 is located on the left side in plan view of the one main surface 4 a of the second sealing member 4. The line width of the sealing-side second bonding pattern 41 is the same at all positions.
- the sealing-side second bonding pattern 41 includes a base PVD film formed by physical vapor deposition on the second sealing member 4 and an electrode formed by stacking by physical vapor deposition on the base PVD film. It consists of a PVD film.
- the sealing-side second bonding pattern 41 is a non-Sn pattern.
- the other main surface 4b of the second sealing member 4 is provided with a pair of external electrode terminals (one external electrode terminal 42a and another external electrode terminal 42b) that are electrically connected to the outside (see FIG. 8).
- the number of external electrode terminals is not limited to two, and may be three or more.
- One external electrode terminal 42 a is electrically connected directly to the first excitation electrode 211 via the vibration side first bonding pattern 216, and the other external electrode terminal 42 b is connected to the second excitation via the vibration side second bonding pattern 217. It is electrically connected directly to the electrode 222.
- the one external electrode terminal 42a and the other external electrode terminal 42b are respectively positioned at both ends in the longitudinal direction of the second main surface 4b of the second sealing member 4 as shown in FIG.
- the pair of external electrode terminals are a base PVD film formed by physical vapor deposition on the other main surface 4b and a physical gas on the base PVD film. It consists of an electrode PVD film formed by phase growth.
- the thickness of the underlying PVD film of the external electrode terminals is the vibration side first bonding pattern 216, vibration side second bonding pattern 217, and sealing side first bonding. It is thick with respect to the thickness of each base PVD film of the pattern 31 and the sealing side second bonding pattern 41. Further, the one external electrode terminal 42 a and the other external electrode terminal 42 b occupy a region of 1/3 or more of the other main surface 4 b of the second sealing member 4.
- the second sealing member 4 is formed with two through holes (second through hole h2 and third through hole h3) as shown in FIGS.
- the second through hole h2 and the third through hole h3 are arranged outside the internal space 13, and as shown in FIG. 7, the second through hole h2 has both main surfaces (one main surface 4a and another main surface 4b).
- the third through hole h3 is located on the upper left side in plan view. That is, the second through hole h ⁇ b> 2 and the third through hole h ⁇ b> 3 are not formed inside the internal space 13.
- the inner side of the inner space 13 means strictly inside the inner peripheral surface of the bonding material 11 without including the bonding material 11 (sealing side second bonding pattern 41).
- the first sealing member 3 and the crystal diaphragm 2 are joined in a state where the vibration-side first joint pattern 216 of the crystal diaphragm 2 and the seal-side first joint pattern 31 of the first sealing member 3 are overlapped. To do.
- the bonding of the second sealing member 4 and the crystal diaphragm 2 is performed by overlapping the vibration-side second bonding pattern 217 of the crystal diaphragm 2 and the sealing-side second bonding pattern 41 of the second sealing member 4. In the state.
- the bonding between the first sealing member 3 and the crystal diaphragm 2 and the bonding between the first sealing member 3 and the crystal diaphragm 2 are performed by diffusion bonding by overlapping each bonding pattern.
- diffusion bonding as a bonding method, generation of gas generated when bonding using an adhesive or the like can be prevented, but a known bonding-only material such as an adhesive may be used.
- the first sealing member 3 and the crystal diaphragm 2 have a gap of 1.00 ⁇ m or less
- the second sealing member 4 and the crystal diaphragm 2 Has a gap of 1.00 ⁇ m or less. That is, the thickness of the bonding material 11 between the first sealing member 3 and the crystal vibrating plate 2 is 1.00 ⁇ m or less, and the bonding material 11 between the second sealing member 4 and the crystal vibrating plate 2 The thickness is 1.00 ⁇ m or less (specifically, 0.15 ⁇ m to 1.00 ⁇ m in the Au—Au bonding of this embodiment).
- a conventional metal paste sealing material using Sn has a thickness of 5 ⁇ m to 20 ⁇ m.
- the quartz diaphragm 2 has the holding portion 22 protruding from the corner portion 21a of the vibrating portion 21 in the Z-axis direction of the AT cut and is held by the outer frame portion 23.
- the vibration part 21 is not held at the center position of the vibration part 21 along the X-axis direction where the displacement of the piezoelectric vibration is large. Therefore, when the crystal diaphragm 2 is vibrated piezoelectrically, the vibration efficiency is high and the piezoelectric vibration can be efficiently performed.
- the vibration part 21 of the crystal diaphragm 2 is held by the outer frame part 23 via the holding part 22 from the two corners 21a on the Z ′ axis, the vibration part 21 is securely held. be able to. Furthermore, the wiring patterns of the first excitation electrode 211 and the second excitation electrode 212 formed on each main surface of the crystal diaphragm 2 can be independently arranged by the holding portions 22 protruding from the two corner portions 21a. Therefore, the parasitic capacitance between the wiring patterns can be suppressed, and the frequency variable amount can be prevented from being reduced.
- Quartz diaphragm 2 is provided with a groove m in at least one of the vibrating section 21 and the holding section 22, and the groove m is a vibrating section with respect to the X axis of the AT cut. 21 (see the center C side in plan view of the first excitation electrode 211 and the second excitation electrode 212) (see FIGS. 9 to 13).
- a groove m is formed from the bottom corner of the mesa structure 213 toward the holding portion 22.
- the groove m since the groove m is provided so as to contact the corner portion 21a, leakage of piezoelectric vibration can be effectively suppressed, but the groove m may not be in contact with the corner portion 21a. Good.
- the groove m may be formed from the vibrating part 21 to the holding part 22.
- the groove m is formed from the side along the Z ′ axis in the mesa structure 213 toward the outer peripheral end of the vibration part 21.
- the groove m is formed from the side along the X axis in the mesa structure 213 toward the outer peripheral end of the vibration part 21.
- the groove m has one or a plurality of first grooves m1 formed on one main surface side of the vibration part 21 and one or a plurality of first grooves m1 formed on the other main surface side of the vibration part 21.
- the first groove m1 and the second groove m2 are alternately arranged from the vibrating part 21 side of the holding part 22 to the outer frame part 23.
- two first grooves m ⁇ b> 1 are formed, one on the vibrating portion 21 and the other on the holding portion 22.
- two second grooves m ⁇ b> 2 are formed, one of which is formed on the vibrating portion 21 and the other is formed on the holding portion 22.
- the first groove m1 and the second groove m2 are alternately arranged from the vibration part 21 side of the holding part 22 to the outer frame part 23 (see FIG. 13).
- the confinement effect can be improved.
- the first groove m1 is provided so as to be in contact with the corner portion 21a, so that leakage of piezoelectric vibration can be effectively suppressed.
- the first groove m1 is connected to the corner portion 21a. It may not be in contact.
- the holding part 22 of the quartz diaphragm 2 of this embodiment protrudes toward the outer frame part 23 only from one corner
- the vibration part 21 of the crystal diaphragm is held by the outer frame part 23 via the holding part 22 protruding toward the outer frame part 23 from only one corner 21a.
- the vibration part 21 can be efficiently held by reducing the number.
- the crystal oscillating device has a recess 23 a having a reduced thickness around the boundary with the holding portion 22 in the outer frame portion 23 of the crystal oscillating plate 2.
- FIG. 18A is a perspective view showing a connection structure between the holding portion 22 and the outer frame portion 23 when the outer frame portion 23 is not provided with the concave portion 23a.
- FIGS. 18B and 18C are perspective views illustrating a connection structure between the holding portion 22 and the outer frame portion 23 when the outer frame portion 23 is provided with a recess 23a.
- the bottom surface of the recess 23a is formed to be flush with the surface of the holding portion 22 (that is, no step is formed between the recess 23a and the holding portion 22). May be.
- a step may be formed between the bottom surface of the recess 23 a and the surface of the holding unit 22.
- the bottom surface of the recess 23a and the surface of the holding portion 22 are surfaces parallel to the one main surface 2a and the other main surface 2b of the quartz crystal diaphragm 2.
- the recesses 23a are provided on both main surfaces of the crystal diaphragm 2, the recesses 23a are formed on at least one main surface of the crystal diaphragm 2. It only has to be provided. Thereby, the thickness of the outer frame part 23, the recessed part 23a, and the holding
- maintenance part 22 becomes the relationship of (thickness of the outer frame part 23)> (thickness of the recessed part 23a)> (thickness of the holding part 22).
- the shape of the recess 23a in plan view is a fan shape, and the boundary line between the region other than the recess 23a and the region of the recess 23a in the outer frame portion 23 has a curvature.
- the shape of the recess 23a in plan view is not particularly limited, and the shape of the recess 23a may be a rectangular shape as shown in FIG. 19A or a trapezoid as shown in FIG. It may be a shape or the like.
- the etching process is the same as that of the first embodiment except for the etching process for forming the vibrating part 21, the holding part 22 and the outer frame part 23 on the crystal plate. Will be explained. In the following description, it is assumed that the mesa structure 213 is formed in the center of the vibration part 21 (see FIG. 6A).
- the crystal diaphragm 2 is subjected to three etching steps of outer shape formation etching, mesa formation etching, and frequency adjustment etching with respect to a rectangular crystal plate, and the vibration portion 21, the holding portion 22, and the outer frame portion 23 is formed.
- FIG. 20 is a plan view showing the quartz plate after the outer shape forming etching is performed on the upper part of the drawing, and the AA sectional view thereof is shown on the lower part.
- a cutout portion k3 is formed in a rectangular crystal plate, and outer shapes of the vibrating portion 21, the holding portion 22, and the outer frame portion 23 are formed.
- 21A and 21B are plan views showing the crystal plate after the mesa formation etching is performed on the crystal plate shown in FIG. 20 in the upper part of the drawing, and the AA sectional view of the lower part. 21A and 21B, the masks used for etching are different, that is, there are differences in the etching regions.
- the mesa formation etching is an etching process for forming the outer shape of the mesa structure 213 at the center of the vibration part 21.
- the mesa formation etching at least a region other than the mesa structure 213 in the vibration unit 21 and a region of the holding unit 22 are etched.
- the quartz plate shown in FIG. 21A only the region of the vibrating portion 21 (other than the mesa structure 213) and the holding portion 22 are etched, whereas in the quartz plate shown in FIG. 21B, the region of the recess 23a is added to this. Etching.
- FIG. 23 are plan views showing the quartz plate after the frequency adjustment etching is performed on the upper part of the figure, and the AA sectional view of the lower part thereof. 22A to 22C, the state of the crystal plate before the frequency adjustment etching or the mask used for the etching is different.
- the frequency adjustment etching is an etching process for adjusting the thicknesses of the vibrating part 21 and the holding part 22 in order to set the oscillation frequency of the crystal vibrating device to a predetermined value.
- the frequency adjustment etching at least the region of the vibrating portion 21 (the entire region including the mesa structure 213) and the region of the holding portion 22 are etched.
- the crystal plate shown in FIG. 22A is obtained by etching the region of the vibration unit 21, the holding unit 22 and the recess 23a with respect to the crystal plate shown in FIG. 21A, or the vibration unit 21 and the holding unit 22 with respect to the crystal plate shown in FIG. This region is formed by etching. That is, in the quartz plate shown in FIG. 22A, the holding portion 22 is subjected to two etchings of mesa formation etching and frequency adjustment etching, but the recess 23a is subjected to either mesa formation etching or frequency adjustment etching. Etching is performed once. Thereby, as shown in FIG. 18C, the crystal diaphragm 2 in which a step is formed between the bottom surface of the recess 23 a and the surface of the holding portion 22 is formed.
- the etching depth by the mesa formation etching and the etching depth by the frequency adjustment etching are described to approximately the same level. However, when the etching depths in these etchings are different, the depth of the recesses 23a can be adjusted by selecting an etching step for forming the recesses 23a.
- the crystal plate shown in FIG. 22B is formed by etching the region of the vibrating portion 21, the holding portion 22, and the recess 23a with respect to the crystal plate shown in FIG. 21B. That is, the crystal plate shown in FIG. 22B is subjected to two etchings of mesa formation etching and frequency adjustment etching on both the holding part 22 and the concave part 23a. Thereby, as shown in FIG. 18B, the crystal diaphragm 2 is formed in which the bottom surface of the recess 23a and the surface of the holding portion 22 are in the same plane.
- the quartz plate shown in FIG. 23 is formed by etching the region of the vibrating portion 21 and the holding portion 22 with respect to the quartz plate shown in FIG. 21A, and the quartz plate does not have a recess 23a. That is, when the recess 23a is formed and when the recess 23a is not formed, only the mask used for etching is changed, and there is no difference in the number of etchings. Therefore, in the quartz crystal vibrating device according to the present embodiment, it is possible to produce the quartz crystal plate 2 in which the recess 23a is formed without adding a manufacturing process.
- the recess 23a is provided in the outer frame portion 23 to eliminate a step at the connection portion between the outer frame portion 23 and the holding portion 22, and the stress concentration at the connection portion.
- the impact resistance of the quartz crystal vibration device can be improved.
- a step remains at the connection portion between the outer frame portion 23 and the holding portion 22, but the concave portion in the outer frame portion 23 is provided by providing the outer frame portion 23 with the concave portion 23 a.
- a step also occurs at the boundary between the 23a formation region and the other region (hereinafter referred to as a recess edge).
- the structure in which the concave portion 23a is provided in the outer frame portion 23 can be expected not only to improve the impact resistance in the crystal vibrating device but also to suppress the vibration leakage from the vibrating portion 21 to the outer frame portion 23.
- the piezoelectric vibration is confined in the vibration part 21, but complete confinement of vibration is difficult, and actually some leakage to the outer frame part 23 occurs.
- the vibration part 21, the holding part 22, and the outer frame part 23 are integrally formed of a quartz plate, so that the influence of vibration leakage is noticeable.
- the vibration leaking from the vibration part 21 can be considered as a path that leaks to the outer frame part 23 through the holding part 22, but when there is a concave part 23a where it is transmitted from the holding part 22 to the outer frame part 23, Therefore, it can be adjusted so as not to resonate with the frame body, and is difficult to be transmitted to the outer frame portion 23.
- the protruding direction of the holding portion 22 from the vibrating portion 21 is the Z′-axis direction.
- This is a configuration for preventing vibration leakage by projecting the holding portion 22 in a direction orthogonal to the displacement direction of AT vibration.
- the AT vibration is confined in the vibration part 21, but in reality, some vibration leaks as a secondary vibration which is another vibration mode.
- the holding portion 22 protruding in the Z′-axis direction easily transmits this vibration leak to the outer frame portion 23, and causes CI fluctuations and frequency fluctuations. Therefore, by providing the recess 23a, vibration leakage to the outer frame portion 23 can be suppressed, and more stable characteristics can be obtained.
- the width D1 of the recess 23a is preferably wider than the width D2 of the holding portion 22 (see FIG. 17).
- the width direction here refers to the direction orthogonal to the protrusion direction of the holding
- the concave part edge becomes a stress concentration part. If the recess edge is farther than the vibration part 21, it is considered that the piezoelectric vibration is less likely to be affected, and the longer the recess edge, the higher the stress dispersion effect. That is, the configuration in which the width D1 of the concave portion 23a is wider than the width D2 of the holding portion 22 leads to a longer concave portion edge, and improves the stress dispersion effect by the concave portion 23a.
- the larger the recess 23a the higher the vibration damping effect, so that the vibration leakage to the outer frame portion 23 can be further suppressed, and the effect of reducing CI and suppressing fluctuation can be expected.
- the shape of the concave edge of the concave portion 23a is preferably an arc shape as shown in FIG. 17 as compared with the rectangle or trapezoidal shape shown in FIGS. 19 (a) and 19 (b).
- the shape of the recess edge is preferably a shape having a curvature.
- the vibration part 21 of the crystal diaphragm is held by one holding part 22, that is, the case where the recess 23a is provided in the structure of the second embodiment is illustrated.
- the present invention is not limited to this, and the concave portion 23a may be provided in the configuration in which the vibrating portion 21 of the crystal diaphragm is held by the two holding portions 22, that is, the configuration of the first embodiment.
- the configuration of the second embodiment has a lower impact resistance because the number of holding portions 22 is smaller than that of the configuration of the first embodiment. For this reason, it is preferable to apply the configuration of the third embodiment in which the recess 23a is provided to improve the impact resistance.
- the crystal resonator device is a crystal resonator, but the present invention can also be applied to a crystal resonator device (for example, a crystal oscillator) other than the crystal resonator.
- a crystal resonator device for example, a crystal oscillator
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Abstract
Description
本発明に係る水晶振動デバイス1の構成を、図1を参照しながら説明する。図1は、水晶振動子の一実施形態の各構成を示した概略構成図である。
本発明に係る水晶振動デバイス1の第1封止部材3について図2及び3を参照しながら説明する。図2は、第1封止部材の概略平面図、図3は、第1封止部材の概略底面図である。
本発明に係る水晶振動板2の実施形態について図4~6を参照しながら説明する。 図4Aは、水晶振動板の第1実施形態の概略平面図、図4Bは、水晶振動板の第1実施形態の他の例の概略平面図、図5は、水晶振動板の第1実施形態の概略底面図、図6Aは、図4Aに示すA-A線に沿う断面図、図6Bは、図4Bに示すB-B線に沿う断面図、図6Cは、水晶振動板の別の例の断面図である。
本発明に係る水晶振動デバイスの第2封止部材について図7及び8を参照しながら説明する。図7は、水晶振動子の第2封止部材の概略平面図、図8は、水晶振動子の第2封止部材の概略底面図である。
次に、上述した水晶振動板2、第1封止部材3、第2封止部材4を用いて水晶振動デバイス1を製造する方法について説明する。
以上、説明したとおり、本実施形態に係る水晶振動板2は、保持部22が振動部21の角部21aからATカットのZ´軸方向に突出し、外枠部23で保持されているので、従来の水晶振動板と異なり、圧電振動の変位が大きいX軸方向に沿った振動部21の中央位置で振動部21が保持されていない。従って、水晶振動板2を圧電振動させた場合、振動効率が高くて効率的に圧電振動させることができる。
次に、第1実施形態の水晶振動デバイスの4つの変形例の構成について、図9~図13を参照しながら説明する。なお、本変形例は、上述した水晶振動板2に溝mが形成されている点が上記実施形態とは異なるだけであるので、以下、その相違点についてのみ説明し、同一の構成要素については、同一符号を付してその説明を省略する。
本変形例に係る水晶振動板2は、振動部21及び保持部22の少なくとも一方には、溝mが設けられており、溝mは、ATカットのX軸に対して振動部21の中心部側(第1励振電極211及び第2励振電極212の平面視での中心C側)に傾斜されている(図9~図13参照)。
図9における変形例では、メサ構造213における底の角部から、保持部22に向けて溝mが形成されている。本変形例では、溝mは角部21aと接触するように設けられているので、圧電振動の漏れを効果的に抑制することができるが、溝mは角部21aと接触していなくてもよい。なお、溝mは、振動部21から保持部22に亘って形成されていてもよい。
図10における変形例では、メサ構造213におけるZ´軸に沿う辺から振動部21の外周端に向けて溝mが形成されている。
図11における変形例では、メサ構造213におけるX軸に沿う辺から振動部21の外周端に向けて溝mが形成されている。
図12及び13における変形例では、溝mは、振動部21の一主面側に形成された一又は複数の第1溝m1と、振動部21の他主面側に形成された一又は複数の第2溝m2とから構成されており、第1溝m1と第2溝m2は、保持部22の振動部21側から外枠部23にかけて交互に配置されている。
次に、第2実施形態の水晶振動デバイスの構成について、図14を参照しながら説明する。なお、本実施形態は、水晶振動板2における保持部22の位置及び数が異なるだけであるので、以下、その相違点についてのみ説明し、同一の構成要素については、同一符号を付してその説明を省略する。
本実施形態の水晶振動板2の保持部22は、振動部21における1つの角部21aのみから外枠部23に向けて突出されている。
次に、第3実施形態の水晶振動デバイスの構成について、図17および図18を参照しながら説明する。なお、本実施形態は、水晶振動板2における保持部22と外枠部23との接続構造が異なるだけであるので、以下、その相違点についてのみ説明し、同一の構成要素については、同一符号を付してその説明を省略する。
次に、本実施形態に係る水晶振動デバイスにおいて、水晶振動板2の製造方法について説明する。尚、水晶振動デバイスの製造方法において、水晶板に振動部21、保持部22および外枠部23を形成するためのエッチング工程以外は第1実施形態と同じであるため、ここでは上記エッチング工程のみを説明する。また、以下の説明では、振動部21の中央にメサ構造213が形成されている構造(図6A参照)を前提としている。
本発明が適用される水晶振動デバイスにおいて、図18(a)に示すように、外枠部23に凹部23aを設けていない構造では、水晶振動デバイスに衝撃等が作用した場合に、外枠部23と保持部22との接続箇所の段差エッジに応力が集中し、折れが生じてしまう虞がある。
11 接合材
12 パッケージ
13 内部空間
2 水晶振動板
2a 一主面
2b 他主面
21 振動部
21a 角部
22 保持部
23 外枠部
23a 凹部
211 第1励振電極
212 第2励振電極
213 メサ構造
214 第1引出電極
215 第2引出電極
216 振動側第1接合パターン
217 振動側第2接合パターン
k1 平面視逆凹形状体
k2 平面視長方形状体
3 第1封止部材
3a 第1封止部材の一主面
3b 第1封止部材の他主面
31 封止側第1接合パターン
4 第2封止部材
41 封止側第2接合パターン
42a 一外部電極端子
42b 他外部電極端子
h1 第1貫通孔
h2 第2貫通孔
h3 第3貫通孔
C 中心部
m 溝
m1 第1溝
m2 第2溝
Claims (15)
- 一主面に形成された第1励振電極と、他主面に形成された第2励振電極とが備えられたATカット型の水晶振動板であって、
前記第1励振電極と前記第2励振電極とが備えられた略矩形状の振動部と、
前記振動部の角部から、ATカットのZ´軸方向に突出され、当該振動部を保持する保持部と、
前記振動部の外周を取り囲むとともに、前記保持部を保持する外枠部と、
を有することを特徴とする水晶振動板。 - 請求項1に記載された水晶振動板であって、
前記保持部をZ´軸方向に延長した延長線上の領域から前記振動部の中心方向側に離れた位置に、前記第1励振電極及び第2励振電極が形成されていること
を特徴とする水晶振動板。 - 請求項1又は2に記載された水晶振動板であって、
前記保持部は、前記振動部において前記Z´軸上に有する2つの角部からそれぞれ前記外枠部に向けて突出されていること
を特徴とする水晶振動板。 - 請求項1又は2に記載された水晶振動板であって、
前記保持部は、前記振動部における1つの角部のみから前記外枠部に向けて突出されていること
を特徴とする水晶振動板。 - 請求項1~4のいずれか1項に記載された水晶振動板であって、
前記外枠部の厚みは、前記保持部の厚みよりも厚いこと
を特徴とする水晶振動板。 - 請求項1~4のいずれか1項に記載された水晶振動板であって、
前記振動部における第1励振電極及び第2励振電極が形成された位置には、前記振動部の中央の領域の厚みがその周囲の領域に比べて厚くされたメサ構造が形成されていること
を特徴とする水晶振動板。 - 請求項1~7のいずれか1項に記載された水晶振動板であって、
前記振動部及び前記保持部の少なくとも一方には、溝が設けられており、
前記溝は、ATカットのX軸に対して前記振動部の中心部側に傾斜されていること
を特徴とする水晶振動板。 - 請求項7に記載された水晶振動板であって、
前記溝は、
前記振動部の一主面側に形成された一又は複数の第1溝と、
前記振動部の他主面側に形成された一又は複数の第2溝とから構成されており、
前記第1溝と前記第2溝は、前記振動部の前記振動部側から前記外枠部にかけて交互に配置されていること
を特徴とする水晶振動板。 - 請求項1から8のいずれかに1項に記載された水晶振動板であって、
前記外枠部は、前記一主面側および前記他主面側の少なくとも一方で、前記保持部と連結される箇所に凹部を有しており、
前記外枠部の厚み、前記凹部の厚み、および前記保持部の厚みは、
(外枠部の厚み)>(凹部の厚み)≧(保持部の厚み)
の関係を満たすこと
を特徴とする水晶振動板。 - 請求項9に記載された水晶振動板であって、
前記凹部は、前記一主面および前記他主面の両方に形成されていること
を特徴とする水晶振動板。 - 請求項9または10に記載された水晶振動板であって、
前記凹部の底面は、前記保持部の表面と同一平面となるように形成されていること
を特徴とする水晶振動板。 - 請求項9または10に記載された水晶振動板であって、
前記凹部の底面は、前記保持部の表面との間に段差が生じるように形成されていること
を特徴とする水晶振動板。 - 請求項9~12の何れか1項に記載された水晶振動板であって、
前記外枠部の主面に垂直な方向から見て、前記外枠部からの前記保持部の突出方向と直交する方向を幅方向とするとき、前記凹部の幅は前記保持部の幅よりも広くされていること
を特徴とする水晶振動板。 - 請求項9~13の何れか1項に記載された水晶振動板であって、
前記凹部の内壁面は、前記外枠部の主面に垂直な方向から見て曲率を有する形状となっていること
を特徴とする水晶振動板。 - 請求項1から14のいずれか1項に記載された水晶振動板と、
前記水晶振動板の前記一主面を覆う第1封止部材と、
前記水晶振動板の前記他主面を覆う第2封止部材と、
が備えられた水晶振動デバイス。
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