WO2011089906A1 - 弾性波装置 - Google Patents
弾性波装置 Download PDFInfo
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- WO2011089906A1 WO2011089906A1 PCT/JP2011/000279 JP2011000279W WO2011089906A1 WO 2011089906 A1 WO2011089906 A1 WO 2011089906A1 JP 2011000279 W JP2011000279 W JP 2011000279W WO 2011089906 A1 WO2011089906 A1 WO 2011089906A1
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- insulator
- wiring
- inorganic
- wave device
- piezoelectric substrate
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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
- H03H9/02992—Details of bus bars, contact pads or other electrical connections for finger electrodes
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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
- H03H9/02937—Means for compensation or elimination of undesirable effects of chemical damage, e.g. corrosion
Definitions
- the present invention relates to an acoustic wave device used as a high-frequency filter for mobile communication devices and the like.
- an elastic wave device is often used as a high-frequency filter having a passband frequency in the range of several tens of MHz to several GHz.
- FIG. 3A is a top view of the piezoelectric substrate 2 of the conventional acoustic wave device 1.
- 3B is a cross-sectional view taken along line 3B-3B of elastic wave device 1 shown in FIG. 3A.
- the acoustic wave device 1 includes a piezoelectric substrate 2 made of a piezoelectric single crystal such as lithium tantalate or lithium niobate, and a plurality of comb electrodes 3 provided on the surface of the piezoelectric substrate 2.
- the acoustic wave device 1 forms a filter circuit using a plurality of comb-shaped electrodes 3 that excite acoustic waves.
- the high-frequency current flowing through the wiring is subjected to an interaction at a location where the wiring connected to the comb-shaped electrode 3 is close to other wiring.
- parasitic components such as parasitic capacitance and parasitic inductance are generated, and high frequency filter characteristics such as insertion loss and attenuation of the acoustic wave device 1 are deteriorated.
- the piezoelectric single crystal that can be used as the piezoelectric substrate 2 is a high dielectric constant material generally having a dielectric constant exceeding 20, a parasitic component is likely to be generated in the wiring disposed on the piezoelectric substrate 2.
- an insulator 6 is disposed between the wiring 4 and the wiring 5 that are three-dimensionally crossed, and an insulator 8 is disposed between the piezoelectric substrate 2 and the wiring 7.
- the insulator 10 is disposed on the top.
- the resin constituting the insulators 6, 8, 10 is damaged and the reliability of the acoustic wave device 1 is impaired. There is.
- the acoustic wave device includes a piezoelectric substrate, a comb electrode provided on the upper surface of the piezoelectric substrate, a first wiring provided on the upper surface of the piezoelectric substrate, and an organic insulator that covers at least a part of the first wiring. And a second wiring provided on the first portion of the upper surface of the organic insulator, and an inorganic insulator covering at least the second portion of the upper surface of the organic insulator.
- An excitation space for exciting the piezoelectric substrate is formed above the comb electrodes. The second portion on the upper surface of the organic insulator is opposed to the excitation space via the inorganic insulator.
- This elastic wave device has good high frequency characteristics and high long-term reliability.
- FIG. 1A is a top view of the piezoelectric substrate of the acoustic wave device according to Embodiment 1 of the present invention.
- 1B is a cross-sectional view of the acoustic wave device shown in FIG. 1A taken along line 1B-1B.
- FIG. 1C is a cross-sectional view of the comb electrode and the wiring of the acoustic wave device according to the first exemplary embodiment.
- FIG. 1D is an enlarged cross-sectional view of the acoustic wave device according to Embodiment 1.
- FIG. 2A is a top view of the piezoelectric substrate of the acoustic wave device according to Embodiment 2 of the present invention.
- FIG. 2B is a cross-sectional view of the acoustic wave device shown in FIG. 2A taken along line 2B-2B.
- 2C is a cross-sectional view of the acoustic wave device shown in FIG. 2A taken along line 2C-2C.
- FIG. 3A is a top view of a piezoelectric substrate of a conventional acoustic wave device.
- 3B is a cross-sectional view of the acoustic wave device shown in FIG. 3A taken along line 3B-3B.
- FIG. 1A is a top view of piezoelectric substrate 12 of elastic wave device 11 according to the first exemplary embodiment of the present invention.
- 1B is a cross-sectional view taken along line 1B-1B of elastic wave device 11 shown in FIG. 1A.
- the acoustic wave device 11 includes a piezoelectric substrate 12 and comb-shaped electrodes 13A to 13E provided on the upper surface 112 of the piezoelectric substrate 12.
- the piezoelectric substrate 12 is made of a piezoelectric single crystal such as lithium tantalate or lithium niobate.
- the comb electrodes 13A to 13E are configured to excite an elastic wave on the piezoelectric substrate 12, and the elastic wave device 11 forms a filter circuit.
- the acoustic wave device 11 further includes wirings 14, 15, 16, 20, and 21 connected to the comb electrodes 13A, 13B, 13C, 13D, and 13E, respectively.
- the wirings 14, 15, 16 and 21 are provided on the upper surface 112 of the piezoelectric substrate 12.
- the wirings 14 and 15 are connected by a wiring 18.
- the wiring 18 crosses the wiring 16 three-dimensionally.
- the insulator 17 is provided on the upper surface 116 of the wiring 16 so as to cover the wiring 16.
- a wiring 18 is provided on the upper surface 117 of the insulator 17.
- the wiring 18 is located directly above the wiring 16 and faces the wiring 16 through the insulator 17.
- the wirings 14, 15, 16, 18, 20, and 21 are conductors, and are configured so that a voltage is applied to operate the acoustic wave device 11.
- An insulator 19 having a low dielectric constant is provided on the upper surface 112 of the piezoelectric substrate 12.
- a wiring 20 is provided on the upper surface 119 of the insulator 19. With this structure, the high frequency characteristics of the wiring 20 are improved.
- the wiring 21 connected to the comb-shaped electrode 13E is provided on the upper surface 112 of the piezoelectric substrate 12.
- An insulator 22 is provided on the upper surface 121 of the wiring 21. The insulator 22 suppresses electromagnetic coupling generated between the wiring 20 adjacent to the wiring 21 and the wiring 21.
- An excitation space 24 is provided above the upper surfaces 117, 119, and 122 of the insulators 17, 19, and 22.
- the insulators 17 and 22 cover at least a part of the wirings 16 and 21, respectively.
- the insulator 19 covers at least a part of the upper surface 112 of the piezoelectric substrate 12.
- the upper surface 112 of the piezoelectric substrate 12 is sealed by a sealing member 25 in a state where the excitation space 24 for exciting the piezoelectric substrate 12 by the comb electrode 13 is secured.
- FIG. 1C is a cross-sectional view of the comb electrodes 13A to 13E and the wirings 14, 15, 16, 18, 20, and 21.
- the comb-shaped electrodes 13A to 13E and the wirings 14, 15, 16, 18, 20, and 21 are a lower layer portion 91 having a lower surface 291 facing the upper surface 112 of the piezoelectric substrate 12, and an upper layer provided on the upper surface 191 of the lower layer portion 91.
- the upper layer portion 92 is mainly composed of aluminum and has a thickness of about 1.4 ⁇ m.
- the lower layer part 91 has a thickness of about 1000 mm with titanium as a main component.
- an insulator 17 provided between the wiring 16 and the wiring 18 includes an inorganic insulator 17A provided on the upper surface 116 of the wiring 16 and covering the wiring 16, and an upper surface 117A of the inorganic insulator 17A.
- the insulator 19 provided between the upper surface 112 of the piezoelectric substrate 12 and the wiring 20 includes an inorganic insulator 19A provided on the upper surface 112 of the piezoelectric substrate 12 and covering the piezoelectric substrate 12, and an upper surface 119A of the inorganic insulator 19A.
- the insulator 22 covering the wiring 21 includes an inorganic insulator 22A provided on the upper surface 121 of the wiring 21 and covering the wiring 21, and an organic insulator provided on the upper surface 122A of the inorganic insulator 22A and covering the inorganic insulator 22A. 22B and an inorganic insulator 22C provided on the upper surface 122B of the organic insulator 22B and covering the organic insulator 22B.
- the inorganic insulators 17A, 17C, 19A, 19C, 22A, and 22C are each composed of a silicon nitride film having a thickness of about 5 to 20 nm and a dielectric constant of 9.6.
- the organic insulators 17B, 19B and 22B are made of a polyimide film having a thickness of about 1 to 3 ⁇ m and a dielectric constant of 2.8.
- the resin constituting the insulators 6, 8, 10 becomes the wiring 4, 5, 7,
- the acoustic wave device 1 is damaged due to hydrolysis, etc., due to the voltage applied to 9, the heat generated by the comb-shaped electrode 3 during excitation, and moisture condensed in the excitation space for exciting the comb-shaped electrode 3. Reliability may be impaired.
- the insulator 17 that secures insulation between the three-dimensionally intersecting wiring 16 and the wiring 18 includes an inorganic insulator 17A and an organic insulator 17B that covers the inorganic insulator 17A. And an inorganic insulator 17C covering the organic insulator 17B.
- the organic insulator 17B can be easily thickened and has a low dielectric constant. Therefore, the generation of parasitic components due to interference between the wiring 16 and the wiring 18 that are three-dimensionally crossed by the organic insulator 17B can be effectively suppressed.
- the moisture resistance of the insulator 17 can be improved by sandwiching the organic insulator 17B between the inorganic insulators 17A and 17C.
- the reliability of the acoustic wave device 11 can be improved.
- the moisture coverage of the acoustic wave device 11 is improved by increasing the area covered. can do.
- the moisture resistance of the acoustic wave device 11 can be improved more effectively.
- the insulator 19 provided between the piezoelectric substrate 12 and the wiring 20 includes an inorganic insulator 19A, an organic insulator 19B that covers the inorganic insulator 19A, and an organic insulator. It is comprised from the inorganic insulator 19C which covers the body 19B.
- the organic insulator 19B can be easily thickened, has a low dielectric constant, reduces the influence of the piezoelectric substrate 12 having a high dielectric constant, and can effectively suppress the generation of parasitic components generated in the wiring 20. By disposing the organic insulator 19B between the inorganic insulators 19A and 19C, moisture resistance can be improved.
- the reliability of the acoustic wave device 11 can be improved.
- the area to be covered is increased, thereby improving the moisture resistance of the acoustic wave device 11.
- Can do By covering the entire organic insulator 19B with the inorganic insulators 19A and 19C, the moisture resistance of the acoustic wave device 11 can be more effectively improved.
- the insulator 22 covering the wiring 21 includes the inorganic insulator 22A, the organic insulator 22B covering the inorganic insulator 22A, and the inorganic insulator 22C covering the organic insulator 22B. It consists of and.
- the organic insulator 22B can be easily thickened and has a low dielectric constant, and can effectively suppress the generation of parasitic components generated between the wiring 21 such as the wiring 20 and other adjacent wiring. By disposing the organic insulator 22B between the inorganic insulators 22A and 22C, moisture resistance can be improved.
- the organic insulators 17B, 19B, and 22B are all covered with the inorganic insulators 17A, 17C, 19A, 19C, 22A, and 22C so that the organic insulators 17B, 19B, and 22B are not exposed to the excitation space 24.
- the moisture resistance of the acoustic wave device 11 can be effectively improved.
- the thickness of the organic insulator 17B is larger than the total thickness of the inorganic insulators 17A and 17C.
- the thickness of the organic insulator 19B is larger than the total thickness of the inorganic insulators 19A and 19C.
- the thickness of the organic insulator 22B is larger than the total thickness of the inorganic insulators 22A and 22C.
- the dielectric constant of the organic insulator 17B is smaller than the dielectric constant of the inorganic insulators 17A and 17C.
- the dielectric constant of the organic insulator 19B is smaller than the dielectric constant of the inorganic insulators 19A and 19C.
- the dielectric constant of the organic insulator 22B is smaller than the dielectric constant of the inorganic insulators 22A and 22C.
- the dielectric constants of the insulators 17, 19, and 22 can be further reduced, and the generation of delay, loss, and parasitic capacitance of high-frequency signals can be more effectively suppressed. 11 high frequency characteristics can be improved.
- the dielectric constants of the inorganic insulators 17A, 17B, 19A, 19C, 22A, 22C and the organic insulators 17B, 19B, 22B are lower than the dielectric constant of the piezoelectric substrate 12.
- inorganic insulators 17A, 17C, 19A, 19C, 22A, and 22C in addition to silicon nitride, inorganic insulators such as silicon dioxide, tantalum pentoxide, niobium pentoxide, tungsten oxide, and aluminum oxide can be used. . If the thickness of the inorganic insulators 17A, 17C, 19A, 19C, 22A, 22C is less than 5 nm, the thickness is mechanically weak, and if it exceeds 50 nm, internal stress accumulates and cracks are likely to occur at the bent portion. ⁇ 50 nm is preferred.
- the thickness of the inorganic insulators 17A, 17C, 19A, 19C, 22A and 22C is particularly preferably 5 to 20 nm.
- the composition of the organic insulators 17B, 19B, and 22B in addition to polyimide-based ones, acrylic or epoxy-based resins can be applied, and a photo-curable resin is used because a fine shape can be formed by a photolithographic method. Good.
- the thickness of the organic insulators 17B, 19B, and 22B may be about 1 to 3 ⁇ m in order to suppress high-frequency parasitic components, but may be 1 to 20 ⁇ m depending on the need for ensuring mechanical strength. .
- an inorganic insulator 23 connected to the insulators 17, 19, 22 may be provided on the upper surface 112 of the piezoelectric substrate 12 around the insulators 17, 19, 22.
- the pad portion 30 is connected to the comb electrodes 13A to 13E and the wirings 14, 15, 16, and 21.
- the inorganic insulator 23 is formed excluding the pad portion 30 so that the pad portion 30 is exposed.
- the outer peripheries of the inorganic insulators 17A, 19A, and 22A and the outer peripheries of the inorganic insulators 17C, 19C, and 22C are joined at the outer peripheral end portions 17D, 19D, and 22D on the upper surface 112 of the piezoelectric substrate 12, respectively.
- the inorganic insulator 23 is connected to the outer peripheral end portions 17D, 19D, and 22D, and can mechanically reinforce the outer peripheral end portions 17D, 19D, and 22D.
- the organic insulator 17B is more firmly covered with the inorganic insulators 17A and 17C
- the organic insulator 19B is more firmly covered with the inorganic insulators 19A and 19C
- the organic insulator is covered with the inorganic insulators 22A and 22C. 22B can be coated more firmly. Thereby, the reliability of the elastic wave apparatus 11 can be improved more.
- the thermal expansion coefficient of the inorganic insulator 23, the thermal expansion coefficients of the inorganic insulators 17A, 19A, and 22A, and the thermal expansion coefficient of the inorganic insulators 17C, 19C, and 22C are substantially the same. Thereby, the stress with respect to the thermal history of these inorganic insulators can be reduced, and the reliability of the acoustic wave device 11 can be further increased.
- FIG. 1D is an enlarged cross-sectional view of the acoustic wave device 11 and particularly shows the inorganic insulator 23.
- the inorganic insulator 17A has a portion 17F extending from the organic insulator 17B to the upper surface 112 of the piezoelectric substrate 12 beyond the outer peripheral end 17D.
- the inorganic insulator 17C has a portion 17G extending from the organic insulator 17B to the upper surface 117F of the portion 17F of the inorganic insulator 17A beyond the outer peripheral end 17D.
- the inorganic insulator 19A has a portion 19F extending from the organic insulator 19B to the upper surface 112 of the piezoelectric substrate 12 beyond the outer peripheral end 19D.
- the inorganic insulator 19C has a portion 19G that extends from the organic insulator 19B to the upper surface 119F of the portion 19F of the inorganic insulator 19A beyond the outer peripheral end 19D.
- the inorganic insulator 22A has a portion 22F extending from the organic insulator 22B to the upper surface 112 of the piezoelectric substrate 12 beyond the outer peripheral end 22D.
- the inorganic insulator 22C has a portion 22G extending from the organic insulator 22B to the upper surface 122F of the portion 22F of the inorganic insulator 22A beyond the outer peripheral end 22D.
- the inorganic insulator 23 includes portions 17F and 17G in which the inorganic insulators 17A and 17C are stacked. Similarly, the inorganic insulator 23 includes portions 19F and 19G in which inorganic insulators 19A and 19C are stacked. The inorganic insulator 23 includes portions 22F and 22G in which inorganic insulators 22A and 22C are stacked.
- the organic insulator 17B is more firmly covered with the inorganic insulators 17A and 17C
- the organic insulator 19B is more firmly covered with the inorganic insulators 19A and 19C
- the organic insulators are covered with the inorganic insulators 22A and 22C.
- the body 22B can be covered more firmly. Thereby, the reliability of the elastic wave apparatus 11 can be improved more.
- the insulators 17, 19, 22 are preferably formed so as to form an acute angle at the outer peripheral end portions 17 ⁇ / b> D, 19 ⁇ / b> D, 22 ⁇ / b> D in contact with the upper surface 112 of the piezoelectric substrate 12.
- the mechanical strength of the outer peripheral end portions 17D, 19D, and 22D where the inorganic insulators 17C, 19C, and 22C are joined to the inorganic insulators 17A, 19A, and 22A can be increased. Reliability can be improved. Also, as shown in FIG.
- the outer peripheral end 17D of the insulator 17 where the wiring 16 and the wiring 18 intersect three-dimensionally forms an acute angle, so that the wiring 18 disposed on the upper surface 117 of the insulator 17 is piezoelectric. It can be bent at an obtuse angle at a location in contact with the substrate 12. As a result, the stress on the wiring 18 can be alleviated, and the reliability of the portion where the wirings 16 and 18 cross three-dimensionally can be improved.
- the organic insulator 17B further has a side surface 317B connected to the upper surface 117B and the lower surface 217B.
- the inorganic insulator 17C has a portion 17H located on the upper surface 117B of the organic insulator 17B and a portion 17J located on the side surface 317B.
- the organic insulator 19B further includes a side surface 319B connected to the upper surface 119B and the lower surface 219B.
- the inorganic insulator 19C has a portion 19H located on the upper surface 119B of the organic insulator 19B and a portion 19J located on the side surface 319B.
- the organic insulator 22B further includes a side surface 322B connected to the upper surface 122B and the lower surface 222B.
- the inorganic insulator 22C has a portion 22H located on the upper surface 122B of the organic insulator 22B and a portion 22J located on the side surface 322B.
- the portions 17H, 19H, and 22H of the inorganic insulators 17C, 19C, and 22C are connected to the portions 17J, 19J, and 22J so as to form obtuse angles at the edge portions 17E, 19E, and 22E, respectively.
- the edge portions 17E, 19E, and 22E face the excitation space 24.
- the inorganic insulators 17C, 19C, and 22C are bent at the edge portions 17E, 19E, and 22E.
- the edge portions 17E, 19E, and 22E have an obtuse angle, it is possible to relieve stress on expansion and contraction of dimensions due to thermal expansion. Therefore, breakage of the inorganic insulators 17C, 19C, and 22C at the edge portions 17E, 19E, and 22E can be suppressed, and the reliability of the acoustic wave device 11 can be improved.
- the edge portion 17E of the insulator 17 forms an obtuse angle, whereby the wiring 18 disposed on the edge portion 17E of the insulator 17 is bent at an obtuse angle. be able to. Thereby, the stress with respect to the wiring 18 can be relieved and the reliability of the part which carries out a three-dimensional intersection can be improved.
- the elastic wave device 11 according to the first embodiment is particularly applied by being applied to a high-frequency device in which dew condensation may occur due to moisture because it has the excitation space 24 inside, such as a surface acoustic wave device and a bulk acoustic wave device. Has a noticeable effect. However, even if the elastic wave device 11 is applied to the boundary acoustic wave device, it is effective in improving the reliability.
- FIG. 2A is a top view of the piezoelectric substrate 12 of the acoustic wave device 61 according to Embodiment 2 of the present invention.
- 2B is a cross-sectional view taken along line 2B-2B of elastic wave device 61 shown in FIG. 2A.
- 2C is a cross-sectional view taken along line 2C-2C of elastic wave device 61 shown in FIG. 2A.
- 2A to 2C the same reference numerals are assigned to the same portions as those of the elastic wave device 11 in the first embodiment shown in FIGS. 1A to 1D.
- the elastic wave device 61 in the second embodiment is different from the elastic wave device 11 in the first embodiment in that the wiring and the organic insulator are covered with one inorganic insulator and faces the excitation space 24 through the inorganic insulator. .
- the wirings 16 and 18 are arranged on the upper surface 112 of the piezoelectric substrate 12 with a three-dimensional intersection with the organic insulator 26 interposed therebetween.
- An organic insulator 27 is provided on the upper surface 112 of the piezoelectric substrate 12.
- the wiring 20 is provided on the upper surface 127 of the organic insulator 27.
- the organic insulator 28 covers the upper surface 121 of the wiring 21 disposed on the upper surface 112 of the piezoelectric substrate 12.
- the surfaces of the wirings 16, 18, 20, 21 and the organic insulators 26, 27, 28 face the excitation space 24 via the inorganic insulator 29, and the wirings 16, 18, 20, 21 and the organic insulators 26, 27, No part of 28 faces the excitation space 24.
- FIG. 2A shows a portion covered with the inorganic insulator 29.
- the pad portion 30 is connected to the comb electrodes 13A to 13E and the wirings 14, 15, 16, and 21.
- the inorganic insulator 23 is formed excluding the pad portion 30 so that the pad portion 30 is exposed.
- Organic insulators 26, 27, and 28 are made of a polyimide film having a thickness of about 1 to 3 ⁇ m and a dielectric constant of 2.8.
- the inorganic insulator 29 is composed of a silicon nitride film having a thickness of about 5 to 20 nm and a dielectric constant of 9.6.
- the material of the inorganic insulator 29 may be silicon dioxide or the like, but a silicon nitride film with low moisture permeability is particularly preferable.
- the organic insulator 26 that secures insulation between the wiring 16 and the wiring 18 that are three-dimensionally crossed is provided. At least a part of the surface of the organic insulator 26 facing the excitation space 24 is covered with an inorganic insulator 29.
- an inorganic insulator 29 With this configuration, it is possible to effectively suppress the generation of parasitic components due to interference between the wiring 16 and the wiring 18 that are three-dimensionally crossed by the organic insulator 26 that is easily thickened and has a low dielectric constant. Also, with this configuration, the moisture resistance of the organic insulator 26 can be improved, and deterioration such as hydrolysis of the organic insulator 26 due to the voltage and moisture applied between the wiring 16 and the wiring 18 is suppressed.
- the reliability of the elastic wave device 61 can be improved.
- the entire surface of the organic insulator 26, the wiring 16, and the wiring 18 facing the excitation space 24 is covered with an inorganic insulator 29 so that the organic insulator 26, the wiring 16, and the wiring 18 are not exposed to the excitation space 24. This makes it possible to improve the moisture resistance of the acoustic wave device 61 more effectively.
- the inorganic insulator 29 At least a part of the surface of the organic insulator 27 provided between the piezoelectric substrate 12 and the wiring 20 facing the excitation space 24 is covered with the inorganic insulator 29.
- the organic insulator 27 and the wiring 20 are more effectively covered with the inorganic insulator 29 so that the surfaces of the organic insulator 27 and the wiring 20 facing the excitation space 24 are covered with the inorganic insulator 29 so that the organic insulator 27 and the wiring 20 are not exposed to the excitation space 24.
- the moisture resistance of the acoustic wave device 61 can be improved.
- the inorganic insulator 29 At least a part of the surface of the organic insulator 28 that covers the wiring 21 that faces the excitation space 24 is covered with the inorganic insulator 29.
- the organic insulator 28 and the wiring 21 are more effectively covered with the inorganic insulator 29 so that the organic insulator 28 and the wiring 21 are not exposed to the excitation space 24 so that the entire surface of the organic insulator 28 and the wiring 21 facing the excitation space 24 is covered with the inorganic insulator 29.
- the moisture resistance of the acoustic wave device 61 can be improved.
- the comb electrodes 13A to 13E are provided on the upper surface 112 of the piezoelectric substrate 12 so as to form an excitation space 24 for exciting the piezoelectric substrate 12 above.
- a wiring 16 is provided on the upper surface 112 of the piezoelectric substrate 12.
- An organic insulator 26 covers at least a part of the wiring 16.
- the wiring 18 is provided on the portion 126 ⁇ / b> B of the upper surface 126 of the organic insulator 26.
- the inorganic insulator 29 covers at least a portion 126 ⁇ / b> A of the upper surface 126 of the organic insulator 26.
- a portion 126 A of the upper surface 126 of the organic insulator 26 faces the excitation space 24 with the inorganic insulator 29 interposed therebetween. Thereby, the moisture resistance of the acoustic wave device 61 can be improved.
- the inorganic insulator 29 covers the portion 126A of the upper surface 126 of the organic insulator 26, the upper surface 116 of the wiring 16, and the upper surface 118 of the wiring 18.
- the portion 126 A of the upper surface 126 of the organic insulator 26, the upper surface 116 of the wiring 16, and the upper surface 118 of the wiring 18 face the excitation space 24 through the inorganic insulator 29. Thereby, the moisture resistance of the acoustic wave device 61 can be improved.
- terms suggesting directions such as “upper surface”, “lower surface”, “directly above”, and “upward” refer to configurations of elastic wave devices 11 and 61 such as a piezoelectric substrate, comb-shaped electrodes, wiring, and insulators. It indicates a relative direction that depends only on the relative positional relationship of the members, and does not indicate an absolute direction such as a vertical direction.
- the elastic wave device according to the present invention has high reliability, and is useful mainly in a high-frequency filter and an antenna duplexer used in mobile communication equipment.
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Abstract
Description
図1Aは本発明の実施の形態1における弾性波装置11の圧電基板12の上面図である。図1Bは図1Aに示す弾性波装置11の線1B-1Bにおける断面図である。
図2Aは本発明の実施の形態2における弾性波装置61の圧電基板12の上面図である。図2Bは図2Aに示す弾性波装置61の線2B-2Bにおける断面図である。図2Cは図2Aに示す弾性波装置61の線2C-2Cにおける断面図である。図2Aから図2Cにおいて、図1Aから図1Dに示す実施の形態1における弾性波装置11と同じ部分には同じ参照番号を付す。
12 圧電基板
13A 櫛形電極
16 配線(第1の配線)
17 絶縁体
17A 無機絶縁体(第1の無機絶縁体)
17B 有機絶縁体
17C 無機絶縁体(第2の無機絶縁体)
17D 外周端部
18 配線(第2の配線)
19 絶縁体
19A 無機絶縁体(第1の無機絶縁体)
19B 有機絶縁体
19C 無機絶縁体(第2の無機絶縁体)
19D 外周端部
21 配線
22 絶縁体
22A 無機絶縁体(第1の無機絶縁体)
22B 有機絶縁体
22C 無機絶縁体(第2の無機絶縁体)
22D 外周端部
23 無機絶縁体(第3の無機絶縁体)
24 励振空間
26 有機絶縁体
29 無機絶縁体
61 弾性波装置
Claims (8)
- 上面を有する圧電基板と、
上方に前記圧電基板を励振するための励振空間を形成するように、前記圧電基板の前記上面上に設けられた櫛形電極と、
前記圧電基板の前記上面上に設けられた第1の配線と、
前記第1の配線の少なくとも一部を覆う有機絶縁体と、
前記有機絶縁体の上面の第1の部分上に設けられた第2の配線と、
前記有機絶縁体の前記上面の少なくとも第2の部分を覆う無機絶縁体と、
を備え、
前記有機絶縁体の前記上面の前記第2の部分は前記無機絶縁体を介して前記励振空間に対向する、弾性波装置。 - 前記無機絶縁体は、前記有機絶縁体の前記上面の前記第2の部分と、前記第2の配線の上面とを覆い、
前記有機絶縁体の前記上面の前記第2の部分と、前記第2の配線の前記上面とは前記無機絶縁体を介して前記励振空間に対向する、請求項1に記載の弾性波装置。 - 上面を有する圧電基板と、
前記圧電基板の前記上面上に設けられた櫛形電極と、
前記圧電基板の前記上面上に設けられた第1の配線と、
前記第1の配線の少なくとも一部を覆う絶縁体と、
を備え、
前記絶縁体は、
前記第1の配線の上面上に設けられた第1の無機絶縁体と、
前記第1の無機絶縁体を覆う有機絶縁体と、
前記有機絶縁体を覆う第2の無機絶縁体と、
を有する、弾性波装置。 - 前記絶縁体の上面上に設けられた第2の配線をさらに備えた、請求項1に記載の弾性波装置。
- 上面を有する圧電基板と、
前記圧電基板の前記上面上に設けられた櫛形電極と、
前記圧電基板の前記上面の少なくとも一部を覆う絶縁体と、
前記絶縁体の上面上に配置された配線と、
を備え、
前記絶縁体は、
前記圧電基板の前記上面上に設けられた第1の無機絶縁体と、
前記第1の無機絶縁体を覆う有機絶縁体と、
前記有機絶縁体を覆う第2の無機絶縁体と、
を有する、弾性波装置。 - 前記有機絶縁体の厚みは前記第1の無機絶縁体の厚みと前記第2の無機絶縁体の厚みとの合計より大きく、
前記有機絶縁体の誘電率は前記第1の無機絶縁体の誘電率と前記第2の無機絶縁体の誘電率より小さい、請求項3から5のいずれか一項に記載の弾性波装置。 - 前記圧電基板の前記上面上に設けられて、前記絶縁体に連なる第3の無機絶縁体をさらに備えた、請求項3から5のいずれか一項に記載の弾性波装置。
- 前記絶縁体が前記圧電基板の前記上面と接する外周端部において、前記絶縁体の断面は鋭角をなす、請求項3から5のいずれか一項に記載の弾性波装置。
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US13/511,508 US9099981B2 (en) | 2010-01-20 | 2011-01-20 | Acoustic wave device having an inorganic insulator and an organic insulator |
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JPWO2011089906A1 (ja) | 2013-05-23 |
CN102687395B (zh) | 2015-05-13 |
US20120279795A1 (en) | 2012-11-08 |
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