WO2017126228A1 - 圧電部品 - Google Patents
圧電部品 Download PDFInfo
- Publication number
- WO2017126228A1 WO2017126228A1 PCT/JP2016/085160 JP2016085160W WO2017126228A1 WO 2017126228 A1 WO2017126228 A1 WO 2017126228A1 JP 2016085160 W JP2016085160 W JP 2016085160W WO 2017126228 A1 WO2017126228 A1 WO 2017126228A1
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- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- electrode
- electrodes
- pair
- piezoelectric
- Prior art date
Links
- 239000000758 substrate Substances 0.000 claims abstract description 89
- 239000000463 material Substances 0.000 description 11
- 230000010355 oscillation Effects 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- UKDIAJWKFXFVFG-UHFFFAOYSA-N potassium;oxido(dioxo)niobium Chemical compound [K+].[O-][Nb](=O)=O UKDIAJWKFXFVFG-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- UYLYBEXRJGPQSH-UHFFFAOYSA-N sodium;oxido(dioxo)niobium Chemical compound [Na+].[O-][Nb](=O)=O UYLYBEXRJGPQSH-UHFFFAOYSA-N 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02086—Means for compensation or elimination of undesirable effects
- H03H9/02125—Means for compensation or elimination of undesirable effects of parasitic elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
- H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
-
- 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
- H03H9/125—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
-
- 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
- H03H9/176—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of ceramic material
Definitions
- the present disclosure relates to a piezoelectric component that is suitably used as, for example, a resonator.
- a piezoelectric component as a resonator is generally composed of a support substrate, a piezoelectric element, and a lid.
- input / output electrodes for electrically connecting an external circuit board and a piezoelectric element are provided on the support substrate in the vicinity of both ends in the longitudinal direction of the support substrate so as to cross the lateral direction of the support substrate.
- the piezoelectric component of the present disclosure includes a rectangular plate-shaped substrate having a longitudinal direction and a width direction, a pair of electrodes provided on the first surface of the substrate with a space in the center of the longitudinal direction,
- the pair of electrodes includes a piezoelectric element having both ends fixed thereto, and the pair of electrodes are provided with notches in the longitudinal direction from the central portion side.
- FIG. 1 It is a perspective view which shows the external appearance of the piezoelectric component of this embodiment.
- FIG. 1 (a) is a partially omitted schematic plan view, (b) is a sectional view taken along line AA, and (c) is a bottom view.
- FIG. 4 (a) is a partially omitted schematic plan view, (b) is a cross-sectional view taken along line BB, and (c) is a bottom view.
- FIG. It is a schematic plan view which shows the electrode in the piezoelectric component shown in FIG. It is a schematic plan view which shows the electrode in the other example of the piezoelectric component of this embodiment. It is a schematic plan view which shows the electrode in the other example of the piezoelectric component of this embodiment. It is a schematic plan view which shows the electrode in the other example of the piezoelectric component of this embodiment. It is a schematic plan view which shows the electrode in the other example of the piezoelectric component of this embodiment. It is a schematic plan view which shows the electrode in the other example of the piezoelectric component of this embodiment.
- any direction of the piezoelectric component 1 may be a vertical direction or a horizontal direction, and the z-axis direction may be referred to as a vertical direction, a height direction, or a thickness direction. Further, when the piezoelectric component 1 is simply referred to as a plan view, it refers to viewing in the z-axis direction. In addition, this invention is not limited by embodiment shown below.
- 1 to 3 includes a rectangular plate-like substrate 2 having a longitudinal direction and a width direction, and a first surface 2a of the substrate 2 with a gap in the center in the longitudinal direction.
- a pair of electrodes 3 provided and a piezoelectric element 4 having both ends fixed to the pair of electrodes 3 are provided.
- a lid 10 is provided on the first surface 2 a of the substrate 2 so as to cover the piezoelectric element 4.
- the substrate 2 includes a dielectric formed as a rectangular flat plate having a length of 2.5 mm to 7.5 mm, a width of 1.0 mm to 3.0 mm, and a thickness of 0.1 mm to 1 mm, for example.
- a dielectric formed as a rectangular flat plate having a length of 2.5 mm to 7.5 mm, a width of 1.0 mm to 3.0 mm, and a thickness of 0.1 mm to 1 mm, for example.
- ceramic materials such as alumina and barium titanate, and resin materials such as glass epoxy can be used.
- a pair of electrodes 3 are provided on the first surface 2 a (upper surface in this example) of the dielectric material constituting the substrate 2.
- the pair of electrodes 3 are electrodes for mechanically fixing both end portions of the piezoelectric element 4 and electrically connecting to the surface electrode 42 (vibration electrode) of the piezoelectric element 4.
- the electrode 3 is provided from one end in the width direction of the substrate 2 to the other end, and the shape in plan view is rectangular.
- the pair of electrodes 3 are arranged at a distance from the longitudinal center of the first surface 2 a of the substrate 2. This interval is set by the length of the piezoelectric element 4, and the electrodes 3 are arranged on both end sides in the length direction of the first surface 2 a of the substrate 2.
- a pair of external electrodes 7 are provided on the second surface 2b opposite to the first surface 2a.
- the external electrode 7 is an electrode for electrically and mechanically connecting the piezoelectric component 1 to an external circuit.
- the external electrode 7 is provided from one end in the width direction of the substrate 2 to the other end, and the shape in plan view is rectangular.
- the pair of external electrodes 7 are electrically connected to the electrodes 3 and the side electrodes 8 provided on the side surfaces of the substrate 2, respectively.
- the surface electrode 42 (vibration electrode) of the piezoelectric element 4 and the external circuit are electrically connected, and signal input / output is performed. That is, the pair of electrodes 3, the pair of side electrodes 8, and the pair of external electrodes 7 provided on the substrate 2 constitute an input / output electrode.
- side electrodes 8 are respectively provided on both side surfaces located in the width direction of the substrate 2.
- the pair of electrodes 3 are provided with notches 31 from the center side of the first surface 2 a of the substrate 2 toward the direction along the longitudinal direction of the substrate 2. ing. It can also be said that there is a recess on the side of the center side of the electrode 3. In other words, the notch 31 is provided in the part of the pair of electrodes 3 facing each other. As a result, a portion in which the distance (distance) between the pair of electrodes 3 which are a part of the input / output electrodes becomes longer is formed.
- the stray capacitance generated between the input and output electrodes is reduced, and the fluctuation of the oscillation frequency due to the stray capacitance can be suppressed, so that the piezoelectric component 1 serving as a highly accurate resonator is obtained.
- the notch 31 is provided on the electrode 3 where the piezoelectric element 4 is mounted, on the outer side of the central part in the width direction of the substrate 2 and on the side surface side of the substrate 2. Thereby, stray capacitance can be reduced while ensuring a bonding area between the electrode 3 and the piezoelectric element 4.
- the substrate 2 has a ground electrode 9 at the center of the second surface 2b opposite to the first surface 2a. It has.
- the pair of electrodes 3 includes a first region 32 extending in the width direction of the substrate 2, a longitudinal direction extending from the first region 32 toward the center portion, and the ground electrode 9 sandwiching the substrate 2 (dielectric). And a second region 33 having a portion facing each other. And the notch 31 is provided in the longitudinal direction from the center part side of each 1st area
- the ground electrode 9 is provided from one end in the width direction to the other end in the central portion in the longitudinal direction of the second surface 2b of the substrate 2, and the shape in plan view is rectangular. This is for forming a capacitor between the second region 33 of the electrode 3 on the first surface 2a of the substrate 2, and is electrically connected to a ground potential of an external circuit substrate or the like.
- the side electrode 8 electrically connected to the ground electrode 9 is provided on the side surface of the substrate 2. Since the ground electrode 9 is not electrically connected to the electrode on the first surface 2a of the substrate 2, it is not always necessary.
- a bonding material such as solder can be bonded from the lower surface to the side surface of the piezoelectric component 1. Strength can be improved and electrical and mechanical connection reliability can be increased. In addition, since it is for the improvement of joining strength, the electrical connection with the ground electrode 9 is not necessarily required.
- the first region 32 is the same portion as the electrode 3 in the example shown in FIGS. That is, the first region 32 is a region for mainly mechanically fixing both end portions of the piezoelectric element 4 and electrically connecting to the surface electrode 42 (vibration electrode) of the piezoelectric element 4.
- the first region 32 is provided from one end (side surface) in the width direction of the substrate 2 to the other end (side surface), and has a rectangular shape in plan view.
- the first region 32 is electrically connected to the pair of external electrodes 7 via the side electrodes 8 provided on the side surfaces of the substrate 2.
- the first region 32 of the pair of electrodes 3, the pair of side electrodes 8, and the pair of external electrodes 7 constitute an input / output electrode.
- the second region 33 is a region extending in the longitudinal direction from the first region 32 toward the center of the substrate 2.
- the first region 32 is provided to a position overlapping the ground electrode 9 in plan view in the central portion in the longitudinal direction of the substrate 2, and the shape in plan view is rectangular.
- the overall shape of the electrode 3 having the first region 32 and the second region 33 is T-shaped.
- the second region 33 has a portion facing the ground electrode 9 with the substrate 2 interposed therebetween.
- the tip portion extending from the first region 32 in the longitudinal direction of the substrate 2 overlaps the ground electrode 9 in a plan view.
- a capacitor is formed by sandwiching the substrate 2, which is a dielectric, between the ground electrode 9 and the second region 33 of the electrode 3.
- the load capacity necessary for the oscillation circuit is built in the piezoelectric component 1.
- the size of the load capacitance can be set by the area where the ground electrode 9 and the second region 33 overlap in a plan view.
- the magnitude of this load capacity is set by the characteristics of the amplifier circuit element that is connected to the piezoelectric component 1 and constitutes an oscillation circuit.
- each of the pair of electrodes 3 is provided with a notch 31 in the longitudinal direction from the center portion side of the substrate 2 in each first region 32.
- the piezoelectric component 1 serving as a highly accurate resonator is obtained.
- the ground electrode 9 is disposed between the pair of external electrodes 8 which are a part of the input / output electrodes, the stray capacitance generated between the external electrodes 8 can be reduced, which is more effective.
- the notch 31 is provided in the first region 32 where the second region 33 is connected and the piezoelectric element 4 is mounted, that is, outside the central portion in the width direction of the substrate 2 and on the side surface side of the substrate 2. Yes.
- the stray capacitance can be reduced while ensuring the bonding area between the electrode 3 and the piezoelectric element 4.
- the shape of the notch 31 in plan view is a triangular shape in the examples shown in FIGS. 2 and 3 and a rectangular shape in the examples shown in FIGS. 5 and 6.
- the shape of the notch 31 is preferably rectangular.
- the trapezoidal shape in which the upper base is located on the center side of the substrate 2 and the lower base is located on the side far from the central part, that is, the width increases as the distance from the center part increases. It is good also as a shape which becomes large.
- the stray capacitance generated between the inner part (the part extending in the longitudinal direction) of the notch 31 of one electrode 3 and the other electrode 3 can be reduced.
- the distance between the inner part of the notch 31 of one electrode 3 and the other electrode 3 is a distance in a direction inclined with respect to the longitudinal direction of the substrate 2 (x-axis direction in the drawing), and this is lengthened. Because it can.
- the length of the electrode 3 along the width direction of the substrate 2 is 1.0 mm to 3.0 mm, which is the same as the width of the substrate 2.
- the length along the length direction of 2 is 0.1 mm to 1.5 mm.
- the size of the first region 32 is, for example, 1.0 mm to 3.0 mm
- the length along the width direction of the substrate 2 is the same as the width of the substrate 2.
- the length along the length direction of the substrate 2 is 0.1 mm to 1.5 mm.
- the size of the second region 33 is, for example, a length along the width direction of the substrate 2 of 0.3 mm to 1.2 mm, and a length along the length direction of the substrate 2 of 0.5 mm to 1.8 mm. It is.
- the width of the notch 31 (the length in the width direction of the substrate 2) may be 10% or more of the length of the electrode 3 in the direction along the width direction of the substrate 2, for example.
- the central portion of the electrode 3 is a portion on which the piezoelectric element 4 is mounted, notches 31 are formed in both outer portions sandwiching the central portion, and this portion is a signal input / output path. . As the input / output path becomes narrower, the resistance increases and the oscillation circuit may be affected. Therefore, it is preferable to provide the notch 31 only on one side of both outer sides of the central portion.
- the width of the notch 31 (the length in the direction along the width direction of the substrate 2) is set to 10 to 30% of the length of the electrode 3 in the width direction of the substrate 2, for example.
- the width of the notch 31 in the width direction of the substrate 2 is the width of the side of the electrode 3 on the center side of the substrate 2, in other words, the opening width.
- the length of the notch 31 (the length in the direction along the longitudinal direction of the substrate 2) may be, for example, 30% or more of the length of the electrode 3 in the direction along the longitudinal direction of the substrate 2.
- the electrode 3, the external electrode 7, the side electrode 8, and the ground electrode 9 are mainly composed of a metal such as gold, silver, copper, aluminum, or tungsten.
- a metal such as gold, silver, copper, aluminum, or tungsten.
- the substrate 2 is made of a ceramic material, a so-called thick film conductor can be used.
- the surface may be formed with a plating film such as Ni / Au or Ni / Sn.
- the piezoelectric element 4 is for generating piezoelectric vibration of thickness longitudinal vibration or thickness shear vibration at a specific frequency in the piezoelectric component 1.
- the piezoelectric element 4 is provided, for example, on a long plate-like piezoelectric body 41, a surface electrode 42 provided on both main surfaces (one main surface and the other main surface) of the piezoelectric body 41, and an end surface of the piezoelectric body 41. And an end face electrode 43.
- the piezoelectric body 41 can be, for example, a flat plate having a length of 1.0 mm to 4.0 mm, a width of 0.2 mm to 2 mm, and a thickness of 40 ⁇ m to 1 mm.
- the piezoelectric body 41 is formed using, for example, piezoelectric ceramics based on lead titanate, lead zirconate titanate, lithium tantalate, lithium niobate, sodium niobate, potassium niobate, a bismuth layered compound, or the like. Can do.
- the surface electrode 42 is a vibrating electrode for applying a voltage to the piezoelectric body 41 to vibrate.
- the surface electrode 42 is disposed on the one main surface and the other main surface of the piezoelectric body 41 so as to have regions (intersection regions) facing each other.
- On one main surface (upper surface) of the piezoelectric body 41 it is provided so as to extend from one end portion in the longitudinal direction of the piezoelectric body 41 toward the other end portion, and on the other main surface (lower surface) of the piezoelectric body 41, the piezoelectric body 41 is piezoelectric.
- the body 41 is provided so as to extend from the other end portion in the longitudinal direction toward the one end portion side, and each has a region facing each other with the piezoelectric body 41 interposed therebetween.
- the surface electrode 42 can be made of metal such as gold, silver, copper, aluminum, chromium, nickel, and has a thickness of 0.1 ⁇ m to 3 ⁇ m.
- the surface electrode 42 is connected to the end face electrode 43 at the end of the piezoelectric body 41.
- the end face electrode 43 is provided in order to improve the mountability and bonding strength when the piezoelectric element 4 is mounted on the substrate 2.
- the end surface electrode 43 is formed with the same material and thickness as the surface electrode 42.
- a piezoelectric element 4 when a voltage is applied between the surface electrodes 42 (vibration electrodes), thickness longitudinal vibration or thickness slip occurs at a specific frequency in a region (cross region) where the surface electrodes 42 (vibration electrodes) face each other. Generates piezoelectric vibration.
- the surface electrode 42 and the end face electrode 43 of the piezoelectric element 4 and the electrode 3 on the substrate 2 are electrically connected via the conductive bonding material 6.
- the support portions 5 are provided on the electrodes 3 of the substrate 2.
- the piezoelectric element 4 is mounted on the support portion 5 so as to vibrate.
- the support portions 5 provided on the pair of electrodes 3 are mounted so as to support both ends of the piezoelectric element 4 in the longitudinal direction. Thereby, a space is formed between the central portion of the piezoelectric element 4 and the substrate 2, and the piezoelectric element 4 is mounted so as to be able to vibrate.
- the support part 5 has conductivity, for example, and is a columnar body formed by dispersing metal powder such as gold, silver, copper, aluminum, tungsten, or the like in a resin.
- the length (diameter) in the vertical and horizontal directions in a plan view is 0.1 mm to 1.0 mm
- the thickness is 10 ⁇ m to 100 ⁇ m
- a prismatic shape or a cylindrical shape is a prismatic shape or a cylindrical shape.
- the conductive bonding material 6 is provided on the electrode 3 and the support portion 5, and both ends of the piezoelectric element 4 in the longitudinal direction are mechanically bonded to the electrode 3 and the support portion 5. Further, the surface electrode 42 (vibration electrode) and the end surface electrode 43 of the piezoelectric element 4 and the electrode 3 are electrically connected through the support portion 5 and the conductive bonding material 6.
- the conductive bonding material 6 for example, solder, a conductive adhesive, or the like is used, and if it is a solder, for example, a lead-free material made of copper, tin, silver, or the like can be used. If so, an epoxy-based conductive resin or a silicone-based resin containing 75 to 95% by mass of conductive particles such as silver, copper, and nickel can be used.
- a lid 10 may be provided on the substrate 2 so as to cover the piezoelectric element 4 as in the example shown in FIGS. 2B and 5B.
- the lid body 10 is bonded to the peripheral edge of the upper surface of the substrate 2 with an adhesive or the like, so that the piezoelectric element 4 accommodated in the internal space formed together with the substrate 2 can be physically influenced from the outside. It has a function of protecting from chemical influences and a hermetic sealing function for preventing entry of foreign matters such as water into the space formed together with the substrate 2.
- a material of the lid body 10 for example, a metal such as stainless steel, a ceramic such as alumina, a resin, glass, or the like can be used.
- an insulating resin material such as an epoxy resin may contain an inorganic filler in a proportion of 25 to 80% by mass so as to reduce the difference in thermal expansion coefficient with the substrate 2.
- the notches 31 provided in each of the pair of electrodes 3 may be provided at positions facing each other across the central portion of the substrate 2 as in the example shown in FIG. With such a configuration, the stray capacitance generated between the input and output electrodes is further reduced, and fluctuations in oscillation frequency associated with the stray capacitance can be further suppressed, so that a highly accurate resonator can be provided.
- the notch 31 of one electrode 3 is translated in the longitudinal direction of the substrate 2, it is only necessary that the opening portions of the notches 31 of both electrodes 3 overlap each other, but the two opening portions coincide with each other. Better.
- the notch 31 may divide the electrode 3 in the width direction of the substrate 2 as in the example shown in FIG.
- the length of the notch 31 may be the same as the length of the electrode 3 (first region 32) in the direction along the longitudinal direction of the substrate 2.
- the width of the notch 31 at this time may be from the center of the electrode 3 to the end in the width direction of the substrate 2 as in the example shown in FIG.
- the example shown in FIG. 10 is a case where the electrode 3 has a first region 32 and a second region 33, and the shape of the electrode 3 in plan view is L-shaped.
- the notch 31 is not formed up to the end in the width direction of the substrate 2, but a portion connected to the side electrode 9 is left. Thereby, especially when the electrode 3 and the side electrode 8 are formed of thick film conductors, the bonding strength between the side electrode 8 and the substrate 2 can be improved.
- a portion similar to this portion is provided as the reinforcing conductor 11 connected to the side electrode 8 connected to the ground electrode 9.
- the width of the notch 31 extends from the central portion of the electrode 3 to the end in the width direction of the substrate 2, and the notch 31 provided in each of the pair of electrodes 3 has the central portion of the substrate 2. It arrange
- Two L-shaped electrodes 3 are arranged at point-symmetrical positions with the center of the first surface 2a of the substrate 2 as the symmetry point. With such a configuration, since there is no portion where the first regions 3a of the respective electrodes 3 face each other, the stray capacitance generated between the input / output electrodes is further reduced.
- the electrode 3 (first region 32) is partly divided or not provided up to the end in the width direction of the substrate 2. Included in the notch.
- Piezoelectric component 2 Substrate 2a: First surface 2b: Second surface 3: Electrode 31: Notch 32: First region 33: Second region 4: Piezoelectric element 41: Piezoelectric element 42: Surface electrode 43: End face electrode 5: Support part 6: Conductive bonding material 7: External electrode 8: Side electrode 9: Ground electrode 10: Lid 11: Reinforcing conductor
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
本開示は、例えばレゾネータとして好適に用いられる圧電部品に関するものである。
2:基板
2a:第1の面
2b:第2の面
3:電極
31:切欠き
32:第1領域
33:第2領域
4:圧電素子
41:圧電体
42:表面電極
43:端面電極
5:支持部
6:導電性接合材
7:外部電極
8:側面電極
9:グランド電極
10:蓋体
11:補強導体
Claims (4)
- 長手方向と幅方向とを有する矩形板状の基板と、前記長手方向の中央部に間隔をあけて前記基板の第1の面上に設けられた一対の電極と、該一対の電極に両端部がそれぞれ固定された圧電素子とを備え、前記一対の電極には、前記中央部側から前記長手方向に切欠きが設けられている圧電部品。
- 前記基板は、前記第1の面とは反対側の第2の面の中央部にグランド電極を備えており、前記一対の電極は、前記基板の幅方向に延びる第1領域と、該第1領域から前記中央部に向かって前記長手方向に延びるとともに、前記基板を挟んで前記グランド電極と対向する部分を有する第2領域とをそれぞれ有しており、それぞれの前記第1領域の前記中央部側から前記長手方向に前記切欠きが設けられている請求項1に記載の圧電部品。
- 前記一対の電極に設けられた前記切欠きは、前記中央部を挟んで互いに対向する位置に設けられている請求項1または請求項2に記載の圧電部品。
- 前記切欠きは、前記電極を前記幅方向に分断している請求項1乃至請求項3のいずれかに記載の圧電部品。
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DE112016006284.2T DE112016006284T5 (de) | 2016-01-23 | 2016-11-28 | Piezoelektrisches Bauteil |
JP2017521611A JP6181904B1 (ja) | 2016-01-23 | 2016-11-28 | 圧電部品 |
CN201680078770.5A CN108476015B (zh) | 2016-01-23 | 2016-11-28 | 压电部件 |
US16/067,960 US11114995B2 (en) | 2016-01-23 | 2016-11-28 | Piezoelectric component |
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JP (1) | JP6181904B1 (ja) |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS63161709A (ja) * | 1986-12-25 | 1988-07-05 | Murata Mfg Co Ltd | 圧電部品 |
JP2003124774A (ja) * | 2001-10-16 | 2003-04-25 | Murata Mfg Co Ltd | チップ型圧電発振子 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH06164290A (ja) * | 1992-11-20 | 1994-06-10 | Rohm Co Ltd | 圧電発振子 |
JP3183169B2 (ja) * | 1996-05-09 | 2001-07-03 | 株式会社村田製作所 | 電子部品の製造方法 |
JP2000091875A (ja) | 1998-09-14 | 2000-03-31 | Matsushita Electric Ind Co Ltd | 圧電部品 |
JP3334669B2 (ja) * | 1999-03-29 | 2002-10-15 | 株式会社村田製作所 | 圧電共振部品 |
JP2000323959A (ja) * | 1999-05-14 | 2000-11-24 | Murata Mfg Co Ltd | 圧電部品 |
JP2001102893A (ja) * | 1999-09-27 | 2001-04-13 | Murata Mfg Co Ltd | チップ型電子部品及びチップ型電子部品の実装構造 |
JP4593728B2 (ja) * | 2000-05-30 | 2010-12-08 | 京セラ株式会社 | 圧電共振子 |
JP2002368571A (ja) * | 2001-06-11 | 2002-12-20 | Matsushita Electric Ind Co Ltd | 圧電振動素子及びそれを用いたフィルタ |
JP4188252B2 (ja) * | 2004-01-20 | 2008-11-26 | 富士通メディアデバイス株式会社 | 弾性表面波装置 |
CN101656521A (zh) * | 2008-08-19 | 2010-02-24 | 刘利武 | 一种石英晶体谐振器基座及其制造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS63161709A (ja) * | 1986-12-25 | 1988-07-05 | Murata Mfg Co Ltd | 圧電部品 |
JP2003124774A (ja) * | 2001-10-16 | 2003-04-25 | Murata Mfg Co Ltd | チップ型圧電発振子 |
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US20200274516A1 (en) | 2020-08-27 |
CN108476015A (zh) | 2018-08-31 |
CN108476015B (zh) | 2021-10-26 |
JP6181904B1 (ja) | 2017-08-16 |
US11114995B2 (en) | 2021-09-07 |
JPWO2017126228A1 (ja) | 2018-01-25 |
DE112016006284T5 (de) | 2018-10-31 |
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