WO2018159596A1 - 弾性表面波デバイス用基板および疑似弾性表面波素子 - Google Patents
弾性表面波デバイス用基板および疑似弾性表面波素子 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
- C30B29/22—Complex oxides
- C30B29/30—Niobates; Vanadates; Tantalates
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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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02543—Characteristics of substrate, e.g. cutting angles
- H03H9/02559—Characteristics of substrate, e.g. cutting angles of lithium niobate or lithium-tantalate substrates
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/08—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of resonators or networks using surface acoustic waves
-
- 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
- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
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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
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02157—Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02543—Characteristics of substrate, e.g. cutting angles
-
- 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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02614—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves
-
- 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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02614—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves
- H03H9/02622—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves of the surface, including back surface
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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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02842—Means for compensation or elimination of undesirable effects of reflections
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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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02866—Means for compensation or elimination of undesirable effects of bulk wave excitation and reflections
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/25—Constructional features of resonators using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6489—Compensation of undesirable effects
Definitions
- the present disclosure relates to a surface acoustic wave device substrate and a pseudo surface acoustic wave element.
- Surface acoustic wave devices are devices that perform signal processing by converting electrical signals into surface acoustic waves.
- the surface acoustic wave device substrate single crystal substrates such as lithium tantalate and lithium niobate having piezoelectric characteristics are used.
- the surface acoustic wave device substrate of the present disclosure is made of a piezoelectric material, and includes a first surface on which a surface acoustic wave propagates and a second surface positioned opposite to the first surface. ) Satisfies at least one of the following.
- the second surface has an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average distance (S) between local peaks is Ra / S ⁇ 11.
- the second surface has an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average interval of unevenness (Sm) is Ra / Sm ⁇ 6.7.
- the second surface has a maximum height (Rmax) of 2.5 ⁇ m to 4.5 ⁇ m, and the relationship between the maximum height (Rmax) and the average distance (S) between the local peaks is Rmax / S ⁇ 130. It is.
- the second surface has a maximum height (Rmax) of 2.5 ⁇ m to 4.5 ⁇ m, and a relationship between the maximum height (Rmax) and the average interval of unevenness (Sm) is Rmax / Sm ⁇ 80. is there.
- the surface acoustic wave device substrate is made of a piezoelectric material substrate having piezoelectric characteristics such as lithium tantalate and lithium niobate.
- a lithium tantalate single crystal is used as the piezoelectric material.
- the lithium tantalate single crystal the 36 ° Y to 46 ° Y lithium tantalate single crystal is suitably used for the pseudo surface acoustic wave device among the surface acoustic wave devices.
- a pseudo surface acoustic wave device substrate made of a 42 ° Y lithium tantalate single crystal is described as the substrate.
- the substrate for a surface acoustic wave device of the present embodiment includes a first surface that is a surface on which surface acoustic waves propagate and a second surface that is positioned opposite to the first surface. Since the surface acoustic wave device substrate is a plate-like body having two main surfaces, the first surface can also be referred to as the first main surface and the second surface as the second main surface.
- the surface acoustic wave device substrate of this embodiment satisfies at least one of the following (1) to (4).
- the second surface has an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average distance (S) between local peaks is Ra / S ⁇ 11.
- the second surface has an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average interval of unevenness (Sm) is Ra / Sm ⁇ 6.7.
- the second surface has a maximum height (Rmax) of 2.5 ⁇ m to 4.5 ⁇ m, and the relationship between the maximum height (Rmax) and the average distance (S) between local peaks is Rmax / S ⁇ 130 It is.
- the second surface has a maximum height (Rmax) of 2.5 ⁇ m to 4.5 ⁇ m, and the relationship between the maximum height (Rmax) and the average interval of unevenness (Sm) is Rmax / Sm ⁇ 80. is there.
- the substrate for the surface acoustic wave device of the present embodiment is a parameter in the width direction of the second surface (direction parallel to the surface), which is an average interval between local peaks (S), an average interval between irregularities (Sm ),
- the arithmetic average roughness (Ra) and the maximum height (Rmax), which are parameters in the height direction (direction perpendicular to the surface) of the second surface, are relatively large.
- the surface acoustic wave device substrate of the present embodiment is used for a surface acoustic wave filter.
- the surface acoustic wave filter an input electrode for excitation and an output electrode for reception are formed on the surface of the substrate for the surface acoustic wave device.
- the output electrode receives the reflected wave that causes spurious (frequency component that is not designed in design). Since the surface acoustic wave filter cannot obtain desired characteristics, the second surface of the surface acoustic wave device substrate is roughened. When the second surface is roughened, the bulk wave is scattered and the reflected wave received by the output electrode is reduced, so that spurious due to the reflected wave is reduced.
- a substrate for a surface acoustic wave device in recent years is required to have few reflected waves from the second surface and few defects and residual stress due to roughening.
- the surface acoustic wave device substrate of the present embodiment has a relatively large arithmetic average roughness (Ra) and maximum height (Rmax), bulk waves are scattered on the second surface and reflected waves received by the output electrode. Is reduced. Therefore, spurious due to the reflected wave is reduced.
- the average distance (S) between the local peaks and the average distance (Sm) between the irregularities are relatively small, there are few defects and residual stresses in the roughening process. Therefore, there are few warpages and cracks due to defects and residual stress due to roughening.
- the average interval (S) between the local peaks may be 0.0015 ⁇ m to 0.025 ⁇ m. Further, the average interval (Sm) of the unevenness may be 0.03 ⁇ m to 0.05 ⁇ m.
- the maximum height (Rmax) is based on JIS B 0601-1982.
- the arithmetic average roughness (Ra), the average interval of unevenness (Sm), and the local peak top average interval (S) are based on JIS B 0601: 1994.
- the pseudo surface acoustic wave element configured to include the surface acoustic wave device substrate of the present disclosure has few reflected waves from the second surface and few defects and residual stress due to roughening.
- a method for manufacturing a pseudo surface acoustic wave device substrate made of a 42 ° Y lithium tantalate single crystal will be described.
- an ingot made of a lithium tantalate single crystal is grown by the Czochralski (CZ) method.
- the pulling orientation of the ingot growth is the same as the crystal orientation of the first surface and the second surface (both surfaces) of the final pseudo surface acoustic wave device substrate.
- the crystal orientation may be close to the crystal orientation on both sides of the pseudo surface acoustic wave device substrate, such as 38 ° Y.
- the ingot is subjected to end surface grinding so that both surfaces have a predetermined crystal orientation, if necessary, and then cylindrical grinding is performed so as to have a diameter similar to the diameter of the substrate for the pseudo surface acoustic wave device. Thereafter, slicing is performed using a multi-wire saw or the like so as to have a predetermined crystal orientation and have a predetermined thickness.
- the second surface after the lapping process has an arithmetic average roughness (Ra) of 0.15 ⁇ m to 0.35 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average distance (S) between the local peaks is Ra / S. ⁇ 11, or the relationship between the arithmetic average roughness (Ra) and the average interval of unevenness (Sm) is Ra / Sm ⁇ 6.7.
- the maximum height (Rmax) is 2.0 ⁇ m to 4.0 ⁇ m
- the relationship between the maximum height (Rmax) and the average distance (S) between the local peaks is Rmax / S ⁇ 130
- the maximum height ( Rmax) and the average interval (Sm) of the irregularities are Rmax / Sm ⁇ 80.
- the processing conditions are not limited to the above conditions and can be appropriately changed as long as a desired rough surface shape can be obtained.
- the processing pressure may be changed during the processing, or the first surface and the second surface may be processed one by one.
- an etching process is performed.
- hydrofluoric acid, nitric acid, or a mixed acid thereof is used as an etchant.
- the second surface has an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and there is a relationship between the arithmetic average roughness (Ra) and the average distance (S) between the local peaks.
- Etching is performed so that Ra / S ⁇ 11 or the relationship between the arithmetic average roughness (Ra) and the average interval (Sm) of the unevenness is Ra / Sm ⁇ 6.7.
- the maximum height (Rmax) is 2.5 ⁇ m to 4.5 ⁇ m, and the relationship between the maximum height (Rmax) and the average distance (S) between the local peaks is Rmax / S ⁇ 130, or the maximum height ( Etching is performed so that the relationship between (Rmax) and the average interval (Sm) of the unevenness is Rmax / Sm ⁇ 80. It is particularly preferable to perform etching so that the arithmetic average roughness (Ra) is 0.25 ⁇ m to 0.35 ⁇ m and the maximum height (Rmax) is 3.0 ⁇ m to 4.0 ⁇ m.
- Etching conditions are, for example, 75 to 85 ° C. for 50 to 120 minutes using a mixed acid in which the mixing ratio of hydrofluoric acid and nitric acid is 1: 1 by volume.
- the substrate made of lithium tantalate single crystal is etched by about 1 ⁇ m on both sides.
- the average distance (S) between the local peaks is 0.0015 ⁇ m to 0.025 ⁇ m
- the average distance (Sm) between the irregularities is 0.03 ⁇ m to 0.05 ⁇ m.
- the first surface is subjected to CMP polishing by chemical mechanical polishing (CMP).
- CMP polishing conditions are such that a slurry using colloidal silica as an abrasive is used and the surface pressure load is 30 g / cm 2 or more, and the first surface and the polishing cloth are brought into contact with each other to advance the polishing. According to such CMP polishing conditions, the shape of the second surface is maintained after the etching.
- a cylindrical lithium tantalate single crystal having a diameter of 108 mm and a length of 100 mm was grown using a high frequency heating CZ method single crystal growth furnace. This was subjected to cylindrical grinding to a diameter of 100 mm with a cylindrical grinding machine, and further sliced using a multi-wire saw to obtain about 150 substrates having a crystal orientation of 42 ° Y and a thickness of 400 ⁇ m.
- the obtained substrate was lapped with a lapping apparatus using # 1000, # 1500, and # 2000 abrasive grains so that the thickness was about 250 ⁇ m at a processing pressure of 4.9 kPa.
- the lapped substrate was etched at 75 ° C. to 85 ° C. for 60 minutes to 90 minutes using a mixed acid in which the mixing ratio of hydrofluoric acid and nitric acid was 1: 1 by volume.
- the first surface of the substrates of Examples and Comparative Examples was subjected to CMP polishing.
- the CMP polishing was performed by using a slurry having colloidal silica having a particle size of 30 to 120 nm as an abrasive, a surface pressure load of 80 to 500 g / cm 2, and contacting the first surface with a polishing cloth for polishing.
- the surface roughness Ra of the obtained first surface was a mirror surface state of 0.1 to 0.2 nm.
- the arithmetic average roughness (Ra), the maximum height (Rmax), the average interval between local peaks (S), and the average interval between irregularities (Sm) on the second surface of each sample obtained were measured by Kosaka Laboratory. This was carried out with a surface roughness measuring machine SE1700 ⁇ made by the manufacturer.
- Sample No. No. 2 had an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average interval of unevenness (Sm) was Ra / Sm ⁇ 6.7. .
- Sample No. Sample No. 1 which is a comparative example corresponding to FIG. No. 5 had an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average distance (S) between local peaks was Ra / S ⁇ 11.
- Sample No. Sample No. 2 which is a comparative example corresponding to FIG. No. 6 had an arithmetic average roughness (Ra) of 0.2 ⁇ m to 0.4 ⁇ m, and the relationship between the arithmetic average roughness (Ra) and the average interval of irregularities (Sm) was Ra / Sm ⁇ 6.7. .
- Sample No. Sample No. 3 which is a comparative example corresponding to FIG. In No. 7, the maximum height (Rmax) was 2.5 ⁇ m to 4.5 ⁇ m, and the relationship between the maximum height (Rmax) and the average distance (S) between the local peaks was Rmax / S ⁇ 130.
- Sample No. Sample No. 4 which is a comparative example corresponding to FIG. In No. 8, the maximum height (Rmax) was 2.5 ⁇ m to 4.5 ⁇ m, and the relationship between the maximum height (Rmax) and the average interval (Sm) of irregularities was Rmax / Sm ⁇ 80.
- Sample No. Samples Nos. 1 to 4 correspond to sample Nos. In contrast to 5-8, the number of reflected waves from the second surface was small, and there were few warpages and cracks thought to be caused by defects and residual stress due to roughening.
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Abstract
Description
(1)第2面は、算術平均粗さ(Ra)が0.2μm~0.4μmであるとともに、算術平均粗さ(Ra)と局部山頂の平均間隔(S)との関係がRa/S≧11である。
(2)第2面は、算術平均粗さ(Ra)が0.2μm~0.4μmであるとともに、算術平均粗さ(Ra)と凹凸の平均間隔(Sm)との関係がRa/Sm≧6.7である。
(3)第2面は、最大高さ(Rmax)が2.5μm~4.5μmであるとともに、最大高さ(Rmax)と局部山頂の平均間隔(S)との関係がRmax/S≧130である。
(4)第2面は、最大高さ(Rmax)が2.5μm~4.5μmであるとともに、最大高さ(Rmax)と凹凸の平均間隔(Sm)との関係がRmax/Sm≧80である。
以下、本開示の弾性表面波デバイス用基板について説明する。弾性表面波デバイス用基板は、タンタル酸リチウム、ニオブ酸リチウムなどの圧電特性を有する、圧電性材料基板からなる。本実施形態では、圧電性材料として、タンタル酸リチウム単結晶を用いた例について説明する。タンタル酸リチウム単結晶として、36°Y~46°Yタンタル酸リチウム単結晶は、弾性表面波デバイスの中でも、擬似弾性表面波デバイスに好適に用いられる。本実施形態では、基板として、42°Yタンタル酸リチウム単結晶からなる擬似弾性表面波デバイス用基板について記載する。
弾性表面波デバイス用基板の製造方法の一例として、42°Yタンタル酸リチウム単結晶からなる擬似弾性表面波デバイス用基板の製造方法について記載する。まず、チョクラルスキー(CZ)法により、タンタル酸リチウム単結晶からなるインゴットを育成する。インゴットの育成の引き上げ方位は、最終的な擬似弾性表面波デバイス用基板の第1面および第2面(両面)の結晶方位と同じとする。なお、38°Yなど、擬似弾性表面波デバイス用基板の両面の結晶方位と近い結晶方位であってもよい。
Claims (9)
- 圧電性材料からなり、弾性表面波が伝搬する第1面と、該第1面の反対に位置する第2面とを備え、
該第2面は、算術平均粗さ(Ra)が0.2μm~0.4μmであるとともに、算術平均粗さ(Ra)と局部山頂の平均間隔(S)との関係がRa/S≧11である、弾性表面波デバイス用基板。 - 圧電性材料からなり、弾性表面波が伝搬する第1面と、該第1面の反対に位置する第2面とを備え、
該第2面は、算術平均粗さ(Ra)が0.2μm~0.4μmであるとともに、算術平均粗さ(Ra)と凹凸の平均間隔(Sm)との関係がRa/Sm≧6.7である、弾性表面波デバイス用基板。 - 圧電性材料からなり、弾性表面波が伝搬する第1面と、該第1面の反対に位置する第2面とを備え、
該第2面は、最大高さ(Rmax)が2.5μm~4.5μmであるとともに、最大高さ(Rmax)と局部山頂の平均間隔(S)との関係がRmax/S≧130である、弾性表面波デバイス用基板。 - 圧電性材料からなり、弾性表面波が伝搬する第1面と、該第1面の反対に位置する第2面とを備え、
該第2面は、最大高さ(Rmax)が2.5μm~4.5μmであるとともに、最大高さ(Rmax)と凹凸の平均間隔(Sm)との関係がRmax/Sm≧80である、弾性表面波デバイス用基板。 - 前記局部山頂の平均間隔(S)が0.0015μm~0.025μmである、請求項1または請求項3に記載の弾性表面波デバイス用基板。
- 前記凹凸の平均間隔(Sm)が0.03μm~0.05μmである、請求項2または請求項4に記載の弾性表面波デバイス用基板。
- 前記圧電性材料はタンタル酸リチウム単結晶である、請求項1乃至請求項6のいずれかに記載の弾性表面波デバイス用基板。
- 36°Y~46°Yタンタル酸リチウム単結晶である、請求項1乃至請求項7のいずれかに記載の弾性表面波デバイス用基板。
- 請求項1乃至請求項8のいずれかに記載の弾性表面波デバイス用基板を基体として備える、疑似弾性表面波素子。
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CN201880012405.3A CN110383684B (zh) | 2017-02-28 | 2018-02-27 | 声表面波器件用基板以及伪声表面波元件 |
US16/486,696 US11476829B2 (en) | 2017-02-28 | 2018-02-27 | Substrate for surface acoustic wave device, and pseudo surface acoustic wave element |
JP2019503011A JP6721202B2 (ja) | 2017-02-28 | 2018-02-27 | 弾性表面波デバイス用基板および疑似弾性表面波素子 |
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JP2002330047A (ja) * | 2001-04-27 | 2002-11-15 | Kyocera Corp | 弾性表面波素子 |
JP2003165795A (ja) * | 2001-11-29 | 2003-06-10 | Shin Etsu Chem Co Ltd | 酸化物単結晶ウエーハ及びその製造方法並びに評価方法 |
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JP2003110390A (ja) | 2001-09-27 | 2003-04-11 | Kyocera Corp | 弾性表面波素子用基板 |
US20120231218A1 (en) * | 2009-09-18 | 2012-09-13 | Sumitomo Electric Industries, Ltd. | Substrate, manufacturing method of substrate, saw device and device |
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US11476829B2 (en) | 2022-10-18 |
KR20190108604A (ko) | 2019-09-24 |
CN110383684A (zh) | 2019-10-25 |
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KR102299066B1 (ko) | 2021-09-07 |
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