WO2016158050A1 - 弾性波装置、通信モジュール機器及び弾性波装置の製造方法 - Google Patents
弾性波装置、通信モジュール機器及び弾性波装置の製造方法 Download PDFInfo
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- WO2016158050A1 WO2016158050A1 PCT/JP2016/054465 JP2016054465W WO2016158050A1 WO 2016158050 A1 WO2016158050 A1 WO 2016158050A1 JP 2016054465 W JP2016054465 W JP 2016054465W WO 2016158050 A1 WO2016158050 A1 WO 2016158050A1
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- support layer
- wave device
- acoustic wave
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- cover member
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- 238000004891 communication Methods 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 15
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- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
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- 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
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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- H03H9/02—Details
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- H03H9/1064—Mounting in enclosures for surface acoustic wave [SAW] devices
- H03H9/1092—Mounting in enclosures for surface acoustic wave [SAW] devices the enclosure being defined by a cover cap mounted on an element forming part of the surface acoustic wave [SAW] device on the side of the IDT's
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
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- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
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- 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
- H03H3/02—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 piezoelectric or electrostrictive resonators or networks
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- 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
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- H03H9/105—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a cover cap mounted on an element forming part of the BAW device
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/02—Forming enclosures or casings
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- H01L2224/11—Manufacturing methods
Definitions
- the present invention relates to an acoustic wave device in which an acoustic wave element having a WLP (Wafer Level Package) structure is mounted on a mounting substrate, a communication module device, and a method of manufacturing the acoustic wave device.
- WLP Wafer Level Package
- an acoustic wave device in which an acoustic wave element having a WLP structure is mounted on a mounting substrate has been widely used for mobile phones and the like.
- a support is provided on the piezoelectric substrate so as to surround a functional part on the piezoelectric substrate. Further, on the piezoelectric substrate, a support column is provided in a portion surrounded by the support.
- the elastic wave element in the following Patent Document 2 has a cover member whose center is curved so as to approach the piezoelectric substrate side.
- the acoustic wave element is sandwiched by two insulating layers from the upper surface and the lower surface, and the side surfaces are covered by a third insulating layer. When the three insulating layers are pressure-bonded, pressure is applied to the cover member, and the cover member is curved.
- Patent Document 2 an acoustic wave element is sealed with three insulating layers that are pressure-bonded.
- An object of the present invention is to provide an elastic wave device, a communication module device, and a method of manufacturing an elastic wave device, in which a mold resin is sufficiently filled between a mounting substrate and a cover member, and the cover member is not easily recessed. There is.
- An acoustic wave device includes a piezoelectric substrate having a pair of opposing main surfaces, an excitation electrode provided on one main surface of the piezoelectric substrate, and the one main surface of the piezoelectric substrate. And at least one first support layer provided on the piezoelectric substrate so as to surround the excitation electrode and the first support layer when viewed in plan. A second support layer that is provided on the first and second support layers, and a cover member that seals the excitation electrode together with the second support layer and the piezoelectric substrate. A wave board, a mounting substrate on which the acoustic wave element is mounted, and a mold resin that is provided on the mounting board and seals the acoustic wave element. The first support layer is thinner than the thickness, and the cover portion But the away from the mounting substrate is curved toward the piezoelectric substrate in a convex shape, and the mold resin is filled between the cover member and the mounting substrate.
- the first support layer has a width direction as a direction crossing the first support layer, and the second support layer is the first support layer. And the width of at least one of the first support layers is narrower than the width of the second support layer. In this case, the area of the portion where the excitation electrode and the like are arranged can be increased.
- the width of at least one first support layer of the plurality of first support layers is other than And the thickness of at least one first support layer of the plurality of first support layers is thinner than the thickness of the other first support layers.
- the area of the portion where the excitation electrode and the like are arranged can be increased.
- the first support layer when the acoustic wave device is viewed in plan, the first support layer is in contact with the second support layer at both ends. In this case, since the first support layer can support the second support layer in the side surface direction, the strength is further increased.
- the first support layer has one end portion and the other end portion, and when the elastic wave device is viewed in plan, the first support layer One end portion of the first support layer is in contact with the second support layer, and the shape of the other end portion of the first support layer is larger than the shape other than the other end portion.
- the cover member can be stably supported.
- the communication module device includes a front end unit including an elastic wave device configured according to the present invention, and an active element connected to the front end unit.
- the mold resin can be more sufficiently filled between the mounting substrate and the cover member.
- a method of manufacturing an acoustic wave device includes a piezoelectric substrate having a pair of opposing main surfaces, an excitation electrode provided on one main surface of the piezoelectric substrate, and the one of the piezoelectric substrates.
- the piezoelectric substrate On the one main surface of the piezoelectric substrate so as to surround the excitation electrode and the first support layer in a plan view with at least one first support layer provided on the main surface A second support layer provided; and a cover member provided on the first and second support layers and sealing the excitation electrode together with the second support layer and the piezoelectric substrate; And a step of mounting the elastic wave device on a mounting substrate, and a step of providing a mold resin on the mounting substrate and sealing the elastic wave device, and In the step of manufacturing the wave element, the second support layer The first and second support layers are provided so that the thickness of the first support layer is smaller than the thickness of the first support layer, and the cover member is convex toward the piezoelectric substrate so as to be away from the mounting substrate. And in the step of sealing the acoustic wave element, the mold resin is provided so that the mold resin is filled between the mounting substrate and the cover member. In this case, the mold resin can be more sufficiently filled between the mounting substrate and the cover member.
- a plurality of the first support layers are provided, and a width of at least one first support layer of the plurality of first support layers is:
- the plurality of first support layers are provided so as to be smaller than the width of the other first support layer.
- the thickness of at least one first support layer can be easily made thinner than the thickness of the second support layer. Therefore, productivity can be improved.
- strength can be raised.
- an elastic wave device a communication module device, and a method of manufacturing an elastic wave device, in which a mold resin is sufficiently filled between a mounting substrate and a cover member and the cover member is difficult to be dented, are provided. be able to.
- FIG. 1 is a front sectional view of an acoustic wave device according to a first embodiment of the present invention.
- 2A is a plan view of the acoustic wave device according to the first embodiment of the present invention
- FIG. 2B is a cross-sectional view of the acoustic wave device taken along line AA in FIG. 2A.
- FIG. FIG. 3 is a front sectional view of the acoustic wave device according to the first modification of the first embodiment of the present invention.
- FIG. 4A is a plan view of an acoustic wave device according to the second embodiment of the present invention, and FIG. 4B is a cross-sectional view of the acoustic wave device taken along line BB in FIG. FIG. FIG.
- FIG. 5 is a plan view of an acoustic wave device according to a second modification of the second embodiment of the present invention.
- FIG. 6A to FIG. 6C are front sectional views for explaining a method for manufacturing an acoustic wave device according to the second embodiment.
- FIG. 7A and FIG. 7B are front sectional views for explaining a method for manufacturing the acoustic wave device according to the second embodiment.
- FIG. 8 is a front sectional view of an acoustic wave device according to the third embodiment of the present invention.
- FIG. 9A is a plan view of the acoustic wave device according to the fourth embodiment of the present invention, and FIG. 9B is an excitation of the acoustic wave device along the line CC in FIG. 9A.
- FIG. 10 is a front sectional view of communication module equipment including the acoustic wave device of the present invention.
- FIG. 11 is a block diagram illustrating an example of a communication module device including the acoustic wave device of the present invention.
- FIG. 1 is a front sectional view of an acoustic wave device according to a first embodiment of the present invention.
- excitation electrodes which will be described later, are shown by a schematic diagram in which a diagonal line is drawn in a rectangle.
- the acoustic wave device 1 has a mounting substrate 3.
- the material of the mounting substrate 3 is not particularly limited, for example, ceramics or the like can be used.
- the acoustic wave element 2 is mounted on the mounting substrate 3. More specifically, electrode lands 4 a and 4 b are provided on the mounting substrate 3. On the other hand, although the details will be described later, the acoustic wave element 2 includes a piezoelectric substrate 13. A second support layer 15b is provided below the piezoelectric substrate 13 in FIG. A cover member 16 is provided below the second support layer 15b. A plurality of bumps 6 are provided below the cover member 16. The bump 6 is made of solder or the like. The acoustic wave element 2 is joined to the electrode lands 4 a and 4 b by bumps 6.
- the mold resin 7 is provided on the mounting substrate 3.
- the acoustic wave element 2 is sealed with the mold resin 7.
- the feature of the present embodiment is that the cover member 16 is curved in a convex shape toward the piezoelectric substrate 13 so as to move away from the mounting substrate 3. Thereby, it is possible to sufficiently fill the mold resin 7 including the space between the cover member 16 and the mounting substrate 3. Furthermore, the first support layers 15a1 and 15a2 that support the cover member 16 make it difficult for the cover member 16 to be recessed. That is, the cover member 16 can be supported by the first support layers 15a1 and 15a2. Therefore, it is possible to have high durability while ensuring high filling property of the mold resin 7 including between the cover member 16 and the mounting substrate 3. This will be described together with details of the configuration of the acoustic wave element 2.
- FIG. 2A is a plan view of the acoustic wave device according to the first embodiment of the present invention.
- FIG. 2B is a cross-sectional view of the acoustic wave device taken along line AA in FIG.
- the acoustic wave element 2 includes the piezoelectric substrate 13.
- the piezoelectric substrate 13 has a first main surface 13a and a second main surface 13b which are a pair of main surfaces facing each other.
- the piezoelectric substrate 13 is not particularly limited.
- the piezoelectric substrate 13 is made of a piezoelectric single crystal such as LiNbO 3 or LiTaO 3 .
- the piezoelectric substrate 13 may be made of piezoelectric ceramics.
- an excitation electrode is provided on the second main surface 13 b as one main surface of the piezoelectric substrate 13.
- the excitation electrodes are a plurality of IDT electrodes 14a to 14c.
- a surface acoustic wave is excited.
- reflectors are provided on both sides of the IDT electrode 14a in the surface acoustic wave propagation direction.
- an elastic wave resonator is configured.
- elastic wave resonators using IDT electrodes 14b and 14c as excitation electrodes are also configured.
- a filter including each of the acoustic wave resonators is configured.
- the circuit configuration of the acoustic wave element 2 is not particularly limited.
- first support layers 15a1 and 15a2 and a second support layer 15b are provided on the second main surface 13b of the piezoelectric substrate 13. As shown in FIG.
- the first support layer 15a1 is provided between the IDT electrode 14a and the IDT electrode 14b.
- the first support layer 15a2 is provided between the IDT electrode 14b and the IDT electrode 14c. Note that at least one first support layer may be provided.
- the first support layers 15a1 and 15a2 have a length direction L and a width direction W1 perpendicular to the thickness direction of the first support layers 15a1 and 15a2.
- the second support layer 15b has a width direction W2 as a direction crossing the second support layer 15b.
- the first support layers 15a1 and 15a2 have a rectangular shape in plan view from the second main surface 13b side of the piezoelectric substrate 13.
- the first support layer 15a1 has both end portions 15a11 and 15a12 in the length direction L.
- the first support layer 15a2 has both end portions 15a21 and 15a22 in the length direction L.
- the planar shape of the first support layers 15a1 and 15a2 is not particularly limited.
- the planar shape of the first support layers 15a1 and 15a2 may have a bent portion, for example.
- the second support layer 15b surrounds the IDT electrodes 14a to 14c and the first support layers 15a1 and 15a2 in a plan view from the second main surface 13b side of the piezoelectric substrate 13. Both end portions 15a11, 15a12 of the first support layer 15a1 and both end portions 15a21, 15a22 of the first support layer 15a2 are in contact with the second support layer 15b.
- the width of the first support layers 15a1 and 15a2 and the width of the second support layer 15b are the same.
- the width of the first support layers 15a1 and 15a2 may be different from the width of the second support layer 15b.
- the thickness of the first support layers 15a1 and 15a2 is smaller than the thickness of the second support layer 15b.
- a cover member 16 is provided on the first support layers 15a1 and 15a2 and the second support layer 15b. More specifically, the cover member 16 is provided in contact with the first support layers 15a1 and 15a2 and the second support layer 15b. Therefore, the cover member 16 has a shape that follows the difference in thickness between the first support layers 15a1 and 15a2 and the second support layer 15b. Since the thickness of the first support layers 15a1 and 15a2 is thinner than the thickness of the second support layer 15b, the cover member 16 is curved in a convex shape toward the piezoelectric substrate 13 so as to approach the piezoelectric substrate 13.
- Under bump metal layers 17 a and 17 b are provided so as to penetrate the second support layer 15 b and the cover member 16.
- the under bump metal layer 17a has first and second end portions 17a11 and 17a12.
- the under bump metal layer 17b has first and second end portions 17b11 and 17b12. The first end portions 17a11 and 17b11 of the under bump metal layers 17a and 17b reach the piezoelectric substrate 13, respectively.
- a plurality of bumps 6 are provided on the cover member 16.
- the second end portions 17a12 and 17b12 of the under bump metal layers 17a and 17b are connected to the bumps 6, respectively.
- the IDT electrodes 14a to 14c are electrically connected to the under bump metal layer 17a or the under bump metal layer 17b.
- each bump 6 is joined to the electrode lands 4a and 4b.
- the IDT electrodes 14a to 14c are electrically connected to the mounting substrate 3 through the electrode lands 4a and 4b, the bumps 6, and the under bump metal layer 17a or the under bump metal layer 17b.
- the distance between the mounting substrate and the cover member is narrower.
- a solid mold resin softened by heating is filled under pressure.
- the cover member 16 is curved in a convex shape toward the piezoelectric substrate 13 so as to move away from the mounting substrate 3. For this reason, the distance between the mounting substrate 3 and the cover member 16 is increased. Therefore, the mold resin 7 can be easily filled between the mounting substrate 3 and the cover member 16. As shown in FIG. 1, there is no gap between the cover member 16 and the mounting substrate 3 and the mold resin 7. Thus, the mold resin 7 can be reliably and sufficiently filled.
- the cover member 16 is provided in contact with the first support layers 15a1 and 15a2. Therefore, by controlling the thickness of the first support layers 15a1 and 15a2, the difference in thickness between the first support layers 15a1 and 15a2 and the thickness of the second support layer 15b can be controlled. Since the cover member 16 has a shape that follows the difference between the thickness of the first support layers 15a1 and 15a2 and the thickness of the second support layer 15b, the degree of curvature of the cover member 16 can be reliably controlled. it can. Then, by making the thickness of the first support layers 15a1 and 15a2 smaller than the thickness of the second support layer 15b, the cover member 16 is recessed downward as shown in FIG.
- the mold resin is more sufficiently filled between the mounting substrate and the cover member. Furthermore, both end portions 15a11 and 15a12 of the first support layer 15a1 and both end portions 15a21 and 15a22 of the first support layer 15a2 are in contact with the second support layer 15b. Thereby, since the 1st support layers 15a1 and 15a2 are supporting the 2nd support layer 15b in the side surface direction, intensity becomes still stronger. Since the thickness of the first support layers 15a1 and 15a2 is smaller than the thickness of the second support layer 15b, the degree of thermal contraction of the first support layers 15a1 and 15a2 when the support layer resin is cured is small. Therefore, the second support layer 15b is not easily deformed. Therefore, not only the strength in the thickness direction of the acoustic wave element 2 but also the strength in the side surface direction can be increased.
- both end portions 15a11, 15a12 of the first support layer 15a1 and the both end portions 15a21, 15a22 of the first support layer 15a2 do not necessarily have to be in contact with the second support layer 15b. Even in this case, the strength in the thickness direction can be increased and the mold resin can be sufficiently filled.
- the width of at least one first support layer may be wider than the width of the second support layer.
- first support layers 55a1 and 55a2 are provided in the elastic wave element 52 of the first modification shown in FIG. 3.
- the width of the first support layer 55a2 is wider than the width of the second support layer 15b. In this case, the strength of the acoustic wave element can be increased.
- FIG. 4A is a plan view of an acoustic wave device according to the second embodiment of the present invention.
- FIG. 4B is a cross-sectional view of the acoustic wave element taken along line BB in FIG.
- the acoustic wave element 22 is different from the first embodiment in that the width of the first support layers 25a1 and 25a2 is narrower than the width of the second support layer 15b.
- the elastic wave element 22 and the elastic wave device of the second embodiment have the same configurations as the elastic wave element 2 and the elastic wave device 1 of the first embodiment except for the points described above.
- the interval between the mounting substrate and the cover member 16 can be widened. Therefore, the same effect as the first embodiment can be obtained. Further, since the widths of the first support layers 25a1 and 25a2 are narrow, the area of the portion where the IDT electrodes 14a to 14c and the like are disposed can be increased. Alternatively, the area of the piezoelectric substrate 13 can be reduced, and the acoustic wave element 22 and the acoustic wave device can be reduced in size.
- the first support layers 65a1 and 65a2 have wide portions 65A1 and 65A2 that are wider than other portions. May be.
- the shapes of the wide portions 65A1 and 65A2 are larger than the shapes other than the other portions.
- the wide portion 65A1 is disposed at a position including the one end portion 65a11 of the first support layer 65a1.
- the end portion 65a11 included in the wide portion 65A1 of the first support layer 65a1 is not in contact with the second support layer 15b.
- the one end portion 65a21 of the first support layer 65a2 is also included in the wide portion 65A2 and does not contact the second support layer 15b. Thereby, the area of the portion where the IDT electrodes 14a to 14c and the like are arranged can be increased, and the cover member 16 can be stably supported.
- the other end portions 65a12 and 65a22 of the first support layers 65a1 and 65a2 are in contact with the second support layer 15b.
- the position of the wide portion 65A1 is not particularly limited. Note that the wide portion 65A1 is located near the center portion in the length direction L of the first support layer 65a1 when both end portions 65a11 and 65a12 of the first support layer 65a1 are in contact with the second support layer 15b. It is preferable.
- the above position is the position farthest from the second support layer 15b in the length direction L. Therefore, the hollow portion composed of the cover member 16, the second support layer 15b, and the piezoelectric substrate 13 is easily crushed at the above position by the pressure in the thickness direction. By disposing the wide portion 65A1 at the above position, the strength of the acoustic wave element 62 can be effectively increased. The same applies to the wide portion 65A2.
- the wide portion 65A1 may be disposed at a position that does not include any of the end portions 65a11 and 65a12 of the first support layer 65a1.
- the wide portion 65A2 may also be disposed at a position that does not include any of the end portions 65a21 and 65a22 of the first support layer 65a2.
- both end portions 65a11 and 65a12 of the first support layer 65a1 and both end portions 65a21 and 65a22 of the first support layer 65a2 may be in contact with the second support layer 15b. In this case, the strength of the acoustic wave element 62 can be further increased.
- planar shapes of the wide portions 65A1 and 65A2 are rectangular, but the planar shape is not particularly limited. For example, it may be a polygon or a circle.
- FIG. 6 (a) to 6 (c) are front sectional views for explaining a method for manufacturing an acoustic wave device according to the second embodiment.
- FIG. 7A and FIG. 7B are front sectional views for explaining a method for manufacturing the acoustic wave device according to the second embodiment.
- a piezoelectric substrate 13 is prepared.
- IDT electrodes 14 a to 14 c are provided on the second main surface 13 b of the piezoelectric substrate 13.
- a metal film is formed by, for example, a sputtering method or a CVD method.
- the metal film is patterned by a photolithography method or the like.
- first support layer and a second support layer are provided on the second main surface 13 b of the piezoelectric substrate 13.
- the first support layer and the second support layer can be provided by, for example, a photolithography method. In this case, the first support layer and the second support layer can be provided simultaneously.
- a photocurable resin layer 25 is laminated on the second main surface 13b of the piezoelectric substrate 13.
- the first region 25X1 and the second region 25X2 of the photocurable resin layer 25 are exposed simultaneously.
- exposure is performed so that the width of the first region 25X1 is smaller than the width of the second region 25X2.
- the first and second regions 25X1 and 25X2 of the photocurable resin layer 25 are photocured.
- the third region 25Y of the photocurable resin layer 25 is not exposed, the third region 25Y is not photocured. Note that the width of the first region 25X1 and the width of the second region 25X2 can be easily adjusted by adjusting the pattern of the mask used for exposure.
- the area for exposing the first region 25X1 is smaller than the area for exposing the second region 25X2 of the photocurable resin layer 25. Accordingly, the speed of the photocuring reaction in the first region 25X1 can be made slower than the speed of the photocuring reaction in the second region 25X2. Therefore, even if the first region 25X1 and the second region 25X2 are exposed simultaneously, the uncured portion of the first region 25X1 can be made larger than the uncured portion of the second region 25X2.
- the uncured portion of the photocurable resin layer is removed by etching.
- the first support layers 25a1 and 25a2 are formed from the first region 25X1 of the photocurable resin layer 25 shown in FIG.
- the second support layer 15b is formed from the second region 25X2 of the photocurable resin layer 25.
- the thickness of the first support layers 25a1 and 25a2 is smaller than the thickness of the second support layer 15b.
- the first support layers 25a1, 25a2 and the second support layer 15b can be provided simultaneously by the photolithography method described above.
- the thickness of the first support layers 25a1 and 25a2 and the second support layer 15b can be adjusted by adjusting the line width to be exposed to the photocurable resin layer 25. Accordingly, the first support layers 25a1 and 25a2 and the second support layer 15b are provided, and at the same time, a difference in thickness between the two can be formed. Thus, productivity can be improved effectively.
- the method for providing the first support layers 25a1, 25a2 and the second support layer 15b is not particularly limited.
- the thickness of the first support layers 25a1, 25a2 and the second support layer 15b may be adjusted by, for example, polishing.
- the cover member 16 is provided on the first support layers 25a1 and 25a2 and the second support layer 15b. At this time, the cover member 16 is provided so as to be in contact with the first support layers 25a1 and 25a2 and the second support layer 15b. Thereby, the cover member 16 is curved in a convex shape toward the piezoelectric substrate 13.
- under bump metal layers 17a and 17b are provided so as to fill the plurality of through holes.
- the under bump metal layers 17a and 17b can be provided by, for example, an electrolytic plating method.
- bumps 6 are respectively provided on the cover member 16 so as to be connected to the under bump metal layers 17a and 17b. Thereby, the elastic wave element 22 can be obtained.
- the acoustic wave element 22 is connected to the electrode lands 4 a and 4 b on the mounting substrate 3 through the bumps 6.
- a mold resin 7 is provided on the mounting substrate 3. Thereby, the acoustic wave element 22 is sealed.
- the cover member 16 of the acoustic wave element 22 is curved in a convex shape toward the piezoelectric substrate 13 so as to move away from the mounting substrate 3. Therefore, the mold resin 7 can be reliably and sufficiently filled between the mounting substrate 3 and the cover member 16. Thereby, the elastic wave apparatus 21 can be obtained.
- FIG. 8 is a front sectional view of the acoustic wave device according to the third embodiment.
- the thickness of the first support layer 35a2 of the acoustic wave element 32 is the same as the thickness of the second support layer 15b, and the width of the first support layer 35a2 is the same as the width of the second support layer 15b. It is the same size.
- the width of the first support layer 35a1 is narrower than the width of the first support layer 35a2, and the thickness of the first support layer 35a1 is smaller than the thickness of the first support layer 35a2 and the second support layer 15b. thin.
- the elastic wave element 32 and the elastic wave device of the third embodiment have the same configuration as the elastic wave element 2 and the elastic wave device 1 of the first embodiment except for the above points.
- the cover member 36 is curved so as to be convex toward the piezoelectric substrate 13 side. Therefore, the same effect as the first embodiment can be obtained.
- the difference in width and thickness between the first support layer 35a1, the first support layer 35a2 and the second support layer 15b can be easily determined by the same method as the method for manufacturing the acoustic wave device 22 of the second embodiment. Can be provided. Therefore, productivity can be improved. Furthermore, since it has the 1st support layer 35a2 with a wide width
- the acoustic wave elements 2, 22, and 32 in the first embodiment, the second embodiment, and the third embodiment use surface acoustic waves.
- the present invention is not limited to an acoustic wave element using a surface acoustic wave, and can also be applied to an acoustic wave device having an acoustic wave element using a bulk wave.
- FIG. 9A is a plan view of an acoustic wave device according to the fourth embodiment of the present invention.
- FIG. 9B is a cross-sectional view of the excitation portion of the acoustic wave device along CC in FIG. 9A.
- the excitation unit is shown by a schematic drawing in which a diagonal line is drawn in a rectangle.
- the acoustic wave element 42 is a membrane type acoustic wave element.
- a bulk wave is excited.
- the configuration of the portion where the bulk wave is excited is different from that of the first embodiment.
- the substrate 48 of the acoustic wave element 42 is not limited to a piezoelectric substrate. Except for the above points, the elastic wave element 42 and the elastic wave device of the fourth embodiment have the same configurations as the elastic wave element 2 and the elastic wave device 1 of the first embodiment.
- the acoustic wave element 42 has a substrate 48.
- substrate 48 is not specifically limited, Ceramics etc. may be used.
- excitation portions 44A to 44C which are portions where bulk waves are excited, are configured.
- the excitation units 44A to 44C have the same configuration. The configuration of the excitation unit 44A will be described with reference to FIG.
- a dielectric film 49 is provided on the substrate 48.
- the dielectric film 49 has a first portion 49 a that is in contact with the substrate 48 and a second portion 49 b that is not in contact with the substrate 48.
- a gap D is disposed between the substrate 48 and the second portion 49 b of the dielectric film 49.
- the dielectric film 49 is not particularly limited, but may be made of, for example, SiO 2 or SiN.
- a first electrode 44 a is provided on the dielectric film 49.
- a piezoelectric film 43 is provided on the dielectric film 49 and the first electrode 44a.
- a second electrode 44b is provided on the piezoelectric film 43.
- the first electrode 44 a and the second electrode 44 b have a portion facing each other with the piezoelectric film 43 interposed therebetween.
- the excitation unit 44A has a membrane type configuration.
- the acoustic wave device of the fourth embodiment has a configuration in which the IDT electrodes 14a to 14c in FIG. 1 are replaced with the excitation units 44A to 44C. Therefore, also in this embodiment, the same effect as that of the first embodiment can be obtained.
- the elastic wave device of the present invention is widely used in various electronic devices and communication devices. This example will be described with reference to FIG.
- FIG. 10 is a front sectional view of a communication module device including the elastic wave device of the present invention.
- the acoustic wave element 2 and the elements 5A and 5B are mounted on the mounting substrate 3 of the communication module device 10.
- the elements 5A and 5B may be passive elements such as capacitors and resistors, or may be active elements such as ICs and transistors.
- the number and type of elements mounted on the mounting substrate 3 are not particularly limited.
- FIG. 11 is a block diagram showing an example of a communication module device including the acoustic wave device of the present invention.
- the communication module device 10 includes, for example, a front end unit 2A and an active element 2B connected to the front end unit 2A. More specifically, the front end portion 2A includes a plurality of acoustic wave elements 2 and a switch 2Aa. The elastic wave element 2 to be used is switched by the switch 2Aa. The front end portion 2A is connected to the antenna 2C. Examples of the active element 2B include PA (Power Amplifier) and LNA (Low Noise Amplifier).
- PA Power Amplifier
- LNA Low Noise Amplifier
- Mobile communication devices include mobile phones, smartphones, and car navigation systems.
- Examples of health care devices include weight scales and body fat scales.
- Health care devices and mobile communication devices include an antenna, an RF module, an LSI, a display, an input unit, a power source, and the like.
- the cover member 16 of the acoustic wave element 2 in the communication module device 10 of the present invention is curved in a convex shape toward the piezoelectric substrate 13 so as to be away from the mounting substrate 3. . Therefore, the mold resin 7 can be reliably and sufficiently filled.
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Abstract
Description
2…弾性波素子
2A…フロントエンド部
2Aa…スイッチ
2B…能動素子
2C…アンテナ
3…実装基板
4a,4b…電極ランド
5A,5B…素子
6…バンプ
7…モールド樹脂
10…通信モジュール機器
13…圧電基板
13a,13b…第1,第2の主面
14a~14c…IDT電極
15a1,15a2…第1の支持層
15a11,15a12,15a21,15a22…端部
15b…第2の支持層
16…カバー部材
17a,17b…アンダーバンプメタル層
17a11,17b11…第1の端部
17a12,17b12…第2の端部
21…弾性波装置
22…弾性波素子
25…光硬化性樹脂層
25a1,25a2…第1の支持層
25X1,25X2…第1,第2の領域
25Y…第3の領域
32…弾性波素子
35a1,35a2…第1の支持層
36…カバー部材
42…弾性波素子
43…圧電体膜
44A~44C…励振部
44a,44b…第1,第2の電極
48…基板
49…誘電体膜
49a,49b…第1,第2の部分
52…弾性波素子
55a1,55a2…第1の支持層
62…弾性波素子
65A1,65A2…幅広部
65a1,65a2…第1の支持層
65a11,65a12,65a21,65a22…端部
Claims (8)
- 対向し合っている一対の主面を有する圧電基板と、前記圧電基板の一方主面上に設けられている励振電極と、前記圧電基板の前記一方主面上に設けられている少なくとも1個の第1の支持層と、平面視した場合において、前記励振電極及び前記第1の支持層を囲むように、前記圧電基板の前記一方主面上に設けられている第2の支持層と、前記第1,第2の支持層上に設けられており、前記第2の支持層及び前記圧電基板と共に前記励振電極を封止しているカバー部材と、を有する弾性波素子と、
前記弾性波素子が実装されている実装基板と、
前記実装基板上に設けられており、前記弾性波素子を封止しているモールド樹脂と、を備え、
前記第2の支持層の厚みよりも前記第1の支持層の厚みが薄く、
前記カバー部材が、前記実装基板から遠ざかるように前記圧電基板に向かって凸状に湾曲しており、
前記実装基板と前記カバー部材との間に前記モールド樹脂が充填されている、弾性波装置。 - 前記第1の支持層が、前記第1の支持層を横断する方向としての幅方向を有し、
前記第2の支持層が、前記第2の支持層を横断する方向としての幅方向を有し、
少なくとも1個の前記第1の支持層の幅が、前記第2の支持層の幅よりも狭い、請求項1に記載の弾性波装置。 - 前記第1の支持層が複数存在し、
前記複数の第1の支持層の内少なくとも1個の第1の支持層の幅が、他の第1の支持層の幅よりも狭く、かつ前記複数の第1の支持層の内少なくとも1個の第1の支持層の厚みが、他の第1の支持層の厚みよりも薄い、請求項2に記載の弾性波装置。 - 前記弾性波装置を平面視した場合に、前記第1の支持層が前記第2の支持層と両端で接している、請求項1~3のいずれか1項に記載の弾性波装置。
- 前記第1の支持層が一方端部及び他方端部を有し、前記弾性波装置を平面視した場合に、前記第1の支持層の一方端部が前記第2の支持層と接しており、前記第1の支持層の他方端部の形状が、該他方端部以外の形状よりも大きい、請求項1~3のいずれか1項に記載の弾性波装置。
- 請求項1~5のいずれか1項に記載の弾性波装置を含むフロントエンド部と、
前記フロントエンド部に接続されている能動素子と、
を備える、通信モジュール機器。 - 対向し合っている一対の主面を有する圧電基板と、前記圧電基板の一方主面上に設けられている励振電極と、前記圧電基板の前記一方主面上に設けられている少なくとも1個の第1の支持層と、平面視した場合において、前記励振電極及び前記第1の支持層を囲むように、前記圧電基板の前記一方主面上に設けられている第2の支持層と、前記第1,第2の支持層上に設けられており、前記第2の支持層及び前記圧電基板と共に前記励振電極を封止しているカバー部材と、を有する弾性波素子を作製する工程と、
前記弾性波素子を実装基板上に実装する工程と、
前記実装基板上にモールド樹脂を設け、前記弾性波素子を封止する工程と、
を備え、
前記弾性波素子を作製する工程では、前記第2の支持層の厚みよりも前記第1の支持層の厚みが薄くなるように、前記第1,第2の支持層を設け、かつ前記カバー部材を、前記実装基板から遠ざかるように前記圧電基板に向かって凸状に湾曲させ、
前記弾性波素子を封止する工程では、前記実装基板と前記カバー部材との間に前記モールド樹脂が充填されるように、前記モールド樹脂を設ける、弾性波装置の製造方法。 - 前記第1の支持層を複数設け、前記複数の第1の支持層の内少なくとも1個の第1の支持層の幅が、他の第1の支持層の幅よりも小さくなるように前記複数の第1の支持層を設ける、請求項7に記載の弾性波装置の製造方法。
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CN106935700A (zh) * | 2017-03-24 | 2017-07-07 | 苏州权素船舶电子有限公司 | 一种电子元器件 |
WO2019044310A1 (ja) * | 2017-08-31 | 2019-03-07 | 株式会社村田製作所 | 弾性波装置およびそれを備えた弾性波モジュール |
US11134344B2 (en) | 2017-08-31 | 2021-09-28 | Murata Manufacturing Co., Ltd. | Acoustic wave device and acoustic wave module including same |
WO2021010164A1 (ja) * | 2019-07-16 | 2021-01-21 | 株式会社村田製作所 | 電子部品および電子部品の製造方法 |
JP2023028625A (ja) * | 2021-08-19 | 2023-03-03 | 三安ジャパンテクノロジー株式会社 | モジュールの製造方法 |
JP7302897B2 (ja) | 2021-08-19 | 2023-07-04 | 三安ジャパンテクノロジー株式会社 | モジュールの製造方法 |
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JPWO2016158050A1 (ja) | 2017-10-26 |
CN107251428A (zh) | 2017-10-13 |
US10164603B2 (en) | 2018-12-25 |
KR20170102925A (ko) | 2017-09-12 |
JP6521059B2 (ja) | 2019-05-29 |
US20170358728A1 (en) | 2017-12-14 |
KR101931508B1 (ko) | 2018-12-21 |
CN107251428B (zh) | 2020-10-23 |
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