WO2016185866A1 - 弾性表面波装置、高周波モジュール及び弾性表面波装置の製造方法 - Google Patents
弾性表面波装置、高周波モジュール及び弾性表面波装置の製造方法 Download PDFInfo
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- WO2016185866A1 WO2016185866A1 PCT/JP2016/062686 JP2016062686W WO2016185866A1 WO 2016185866 A1 WO2016185866 A1 WO 2016185866A1 JP 2016062686 W JP2016062686 W JP 2016062686W WO 2016185866 A1 WO2016185866 A1 WO 2016185866A1
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- acoustic wave
- wave device
- electrode
- surface acoustic
- columnar
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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
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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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/058—Holders; Supports for surface acoustic wave devices
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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
- H03H9/25—Constructional features of resonators using surface acoustic waves
Definitions
- the present invention relates to a surface acoustic wave device that excites a surface acoustic wave by an electrode provided on a piezoelectric substrate, a high-frequency module, and a method for manufacturing the surface acoustic wave device.
- a surface acoustic wave device has been used as a bandpass filter used in an RF (Radio Frequency) circuit such as a communication device. Since communication devices such as mobile phones are required to be smaller and thinner, efforts are being made to reduce the size and height of components such as surface acoustic wave devices.
- a WLP Wafer Level Package
- the WLP structure is a structure in which the piezoelectric substrate itself is used as a part of a package, and the package structure is manufactured in a wafer state.
- an IDT Inter Digital Transducer
- the surface acoustic wave device disclosed in Patent Document 1 includes a columnar electrode electrically connected to the IDT electrode and a solder bump connected to the columnar electrode.
- the surface acoustic wave device is mounted on the land electrode on the mounting substrate by the solder bump. Therefore, there is a possibility that breakage may occur at the connection portion between the solder bump and the land electrode and at the connection portion between the solder bump and the columnar electrode.
- the present invention provides a surface acoustic wave device capable of realizing a reduction in size and height and improving the mounting strength, a high-frequency module using the same, and a method of manufacturing the surface acoustic wave device.
- the purpose is to provide.
- a surface acoustic wave device includes a piezoelectric substrate, an IDT electrode provided on one main surface of the piezoelectric substrate and exciting a surface acoustic wave, and the one A support layer standing on the periphery of the region where the IDT electrode on the main surface is provided, and having a height higher from the one main surface than the IDT electrode, and disposed on the support layer, the IDT electrode A cover layer covering the first substrate and a columnar electrode that is erected at a position in contact with the support layer and electrically connected to the IDT electrode, the piezoelectric substrate, the support layer And an inner space is formed by the cover layer, and the columnar electrode includes a bottom surface facing the one main surface, a top surface, and a side surface connecting the bottom surface and the top surface, each of the top surface and the side surface The exposed part that is exposed to the outside To.
- the surface acoustic wave device can be downsized.
- the surface acoustic wave device can be reduced in height.
- the mounting strength can be improved because the surface acoustic wave device can be connected not only to the upper surface of the columnar electrode but also to the mounting substrate.
- the area of the exposed portion on the upper surface may be larger than the area of the exposed portion on the side surface.
- the exposed portion of the side surface may be provided continuously with the exposed portion of the upper surface.
- the exposed portion and the side surface of the upper surface are affected by the wettability of the bonded member.
- the joining member is also applied to the exposed portion on the side surface through a portion where the exposed portion is continuous. That is, at the time of mounting, the bonding member is naturally applied to the exposed portion of the side surface by simply applying the bonding member to the exposed portion of the upper surface and heating.
- connection electrode made of a conductive material different from the material forming the columnar electrode may be provided on the exposed portion of the upper surface and the exposed portion of the side surface.
- the mounting strength of the surface acoustic wave device is improved by selecting a material that strongly joins both the joining member such as solder used for mounting and the material constituting the columnar electrode as the material constituting the connection electrode. Can do.
- the connection electrode is provided, it is not necessary to consider the bonding strength between the materials constituting the bonding member and the columnar electrode, so that the degree of freedom in selecting each material can be improved.
- the upper surface of the columnar electrode may have a smaller distance from the one main surface than the main surface facing the outside of the cover layer.
- the upper surface of the columnar electrode can be disposed at a position lower than the main surface of the cover layer. That is, a step can be provided between the main surface of the cover layer and the upper surface of the columnar electrode. For this reason, when the surface acoustic wave device is mounted on a mounting substrate or the like, a joining member for connecting the columnar electrode and the mounting substrate can be disposed on the upper surface of the columnar electrode. Thereby, it is possible to suppress an increase in the mounting height of the surface acoustic wave device due to the height (thickness) of the joining member by the level difference. Therefore, a reduction in the height of the high-frequency module mounted with the surface acoustic wave device can be realized.
- the high-frequency module includes the surface acoustic wave device and a mounting substrate provided with a land electrode on which the surface acoustic wave device is mounted, and the columnar electrode is exposed on the upper surface. It may be connected to the land electrode through a portion and an exposed portion of the side surface.
- the surface acoustic wave device is reduced in height as described above, a reduction in the height of the high-frequency module on which the surface acoustic wave device is mounted can be realized. Further, since the surface acoustic wave device is downsized, the mounting area of the surface acoustic wave device can be reduced. Furthermore, since it can be connected not only to the upper surface of the columnar electrode of the surface acoustic wave device but also to the mounting substrate, the mounting strength can be improved.
- cover layer may be in contact with the mounting substrate.
- the gap between the surface acoustic wave device and the mounting substrate can be minimized, so that the height of the high-frequency module can be further reduced. Further, heat can be radiated from the surface acoustic wave device to the mounting substrate through the contact portion of the cover layer with the mounting substrate. For this reason, even when a large power is input to the IDT electrode of the surface acoustic wave device, the temperature rise of the surface acoustic wave device can be suppressed. Therefore, the characteristic change of the surface acoustic wave device due to the temperature rise can be suppressed.
- the method for manufacturing a surface acoustic wave device includes a step of providing an IDT electrode for exciting a surface acoustic wave on one main surface of a piezoelectric substrate base material, and the above-mentioned one on the one main surface.
- a surface acoustic wave device including columnar electrodes each having an exposed portion that is exposed to the outside on the upper surface and side surfaces. That is, it is possible to manufacture a surface acoustic wave device that can be reduced in size and height and can improve mounting strength.
- a surface acoustic wave device that can be downsized and reduced in height and that can improve mounting strength, a high-frequency module including the surface acoustic wave device, and a method of manufacturing the surface acoustic wave device are provided. Can be provided.
- FIG. 1 is a perspective view showing an appearance of a surface acoustic wave device according to Embodiment 1.
- FIG. FIG. 2 is a cross-sectional view of the surface acoustic wave device according to the first embodiment.
- FIG. 3 is a cross-sectional view of a surface acoustic wave device of a comparative example.
- FIG. 4 is a cross-sectional view showing each manufacturing process of the surface acoustic wave device according to the first embodiment.
- FIG. 5 is a sectional view showing each manufacturing process of the surface acoustic wave device according to the first embodiment.
- FIG. 6 is a cross-sectional view showing the configuration of the high-frequency module according to the second embodiment.
- FIG. 7 is a cross-sectional view of the surface acoustic wave device according to the third embodiment.
- FIG. 8 is a cross-sectional view of the surface acoustic wave device according to the fourth embodiment.
- FIG. 9 is a cross-sectional view illustrating a configuration of a high-frequency module on which the surface acoustic wave device according to the fourth embodiment is mounted.
- FIG. 1 is a perspective view showing an appearance of a surface acoustic wave device 1 according to the present embodiment.
- FIG. 2 is a cross-sectional view of the surface acoustic wave device 1 according to the present embodiment.
- FIG. 2 is a sectional view of the surface acoustic wave device 1 in a plane passing through the line II-II shown in FIG.
- the surface acoustic wave device 1 includes a piezoelectric substrate 11, an IDT electrode 20, a terminal electrode 21, a wiring electrode 30, a dielectric layer 40, a support layer 50, and a cover.
- the layer 60 and the columnar electrode 70 are provided.
- the piezoelectric substrate 11 is a substrate on which an IDT electrode 20 for exciting a surface acoustic wave is provided on one main surface.
- the piezoelectric substrate 11 has a rectangular shape with a side length of about 1 mm when viewed from above, but the piezoelectric substrate 11 has a rectangular shape when viewed from above. It is not limited and may be any shape.
- the piezoelectric substrate 11 is a substrate made of, for example, a piezoelectric single crystal such as lithium tantalate (LiTaO 3 ), lithium niobate (LiNbO 3 ), or quartz, or piezoelectric ceramics.
- a piezoelectric single crystal such as lithium tantalate (LiTaO 3 ), lithium niobate (LiNbO 3 ), or quartz, or piezoelectric ceramics.
- the IDT electrode 20 is a comb-shaped electrode that is provided on one main surface of the piezoelectric substrate 11 and excites a surface acoustic wave.
- the IDT electrode 20 is made of, for example, a metal or alloy such as Ti, Al, Cu, Au, Pt, Ag, Pd, or Ni.
- the IDT electrode 20 may be comprised from the some laminated body comprised from said metal or an alloy.
- the terminal electrode 21 is an electrode connected to the IDT electrode 20 and is provided around the IDT electrode 20.
- the terminal electrode 21 is made of the same material as the IDT electrode 20.
- the terminal electrode 21 may be comprised from the several laminated body comprised from a metal or an alloy similarly to the IDT electrode 20. FIG.
- the wiring electrode 30 is an electrode that is electrically connected to the IDT electrode 20 and constitutes a part of a wiring path that connects the IDT electrode 20 and a wiring outside the surface acoustic wave device 1.
- the wiring electrode 30 is provided on the terminal electrode 21.
- the wiring electrode 30 is made of the same material as the IDT electrode 20.
- the wiring electrode 30 may be comprised from the several laminated body comprised from a metal or an alloy similarly to the IDT electrode 20. FIG.
- the dielectric layer 40 is a protective layer formed so as to cover the IDT electrode 20.
- the dielectric layer 40 may be used to improve the characteristics of the surface acoustic wave device 1.
- the dielectric layer 40 is provided on the piezoelectric substrate 11 so as to cover the IDT electrode 20, and is made of a dielectric such as silicon oxide or silicon nitride.
- the support layer 50 is a layer that stands on the periphery of the region where the IDT electrode 20 is provided on one main surface of the piezoelectric substrate 11 and has a height higher than the IDT electrode 20 from the one main surface.
- the support layer 50 is a member that supports the surface of the cover layer 60 on the piezoelectric substrate 11 side in a state where the cover layer 60 is separated from the IDT electrode 20.
- the support layer 50 has a substantially rectangular annular shape in a top view, but the shape of the support layer 50 is not limited to this.
- the shape of the support layer 50 may be a shape that is provided upright around the region where the IDT electrode 20 is provided and can support the cover layer 60.
- the support layer 50 has an annular shape and surrounds the IDT electrode 20, so that the space between the IDT electrode 20 and the cover layer 60 is liquid-tightly sealed by the support layer 50 and the cover layer 60. be able to. That is, it is possible to prevent liquid such as water from entering the space on the IDT electrode 20.
- the material constituting the support layer 50 is not particularly limited.
- the support layer 50 is made of, for example, a material containing at least one of polyimide, epoxy, benzocyclobutene (BCB), polybenzoxazole (PBO), metal, and silicon oxide.
- the cover layer 60 is a layer that is disposed on the support layer 50 and covers the IDT electrode 20.
- the cover layer 60 is disposed at a position facing the main surface of the piezoelectric substrate 11 on which the IDT electrode 20 is formed, separated from the IDT electrode 20. Thereby, as shown in FIG. 2, a gap 90 is formed between the IDT electrode 20 (and the dielectric layer 40) and the cover layer 60.
- the cover layer 60 has a rectangular shape similar to that of the piezoelectric substrate 11 when viewed from above, but the shape of the cover layer 60 when viewed from above is not limited to a rectangle. Any shape can be used. Further, the shapes of the cover layer 60 and the piezoelectric substrate 11 in a top view may be different from each other.
- the cover layer 60 includes a first layer 61 and a second layer 62.
- the first layer 61 is a layer for connecting the support layer 50 and the second layer 62.
- the material which comprises the 1st layer 61 is not specifically limited, For example, it is comprised from the material containing at least 1 of an epoxy, urethane, a phenol, polyester, BCB, and PBO.
- the second layer 62 is a layer disposed on the first layer 61.
- the material which comprises the 2nd layer 62 is not specifically limited, Since it is a layer exposed to the exterior of the surface acoustic wave apparatus 1, it is preferable that mechanical strength is high.
- the second layer 62 is made of, for example, a material containing at least one of polyimide, epoxy, BCB, PBO, silicon, silicon oxide, LiTaO 3 , and LiNbO 3 .
- the cover layer may be composed of a single layer.
- the columnar electrode 70 is an electrode that is erected on a position on one main surface of the piezoelectric substrate 11 and in contact with the support layer 50 and is electrically connected to the IDT electrode 20.
- the columnar electrode 70 constitutes a part of a wiring path that connects the wiring electrode 30 and external wiring.
- FIG. 2 in the surface acoustic wave device 1, an internal space is formed by the piezoelectric substrate 11, the support layer 50, and the cover layer 60.
- the columnar electrode 70 includes a bottom surface 73 that faces one main surface of the piezoelectric substrate 11, a top surface 71 that faces the bottom surface 73, and a side surface 72 that connects the bottom surface 73 and the top surface 71.
- each of the upper surface 71 and the side surface 72 of the columnar electrode 70 has an exposed portion exposed to the outside.
- “external” means a space opposite to the internal space with respect to the piezoelectric substrate 11, the support layer 50, and the cover layer 60 that form the internal space. That is, “external” means a space outside the surface acoustic wave device 1.
- the surface acoustic wave device 1 is mounted on a mounting substrate through the exposed portion. As shown in FIG. 2, the end of the wiring electrode 30 and the end of the IDT electrode 20 may be exposed to the outside continuously from the side surface 72. In this case, the surface acoustic wave device 1 may be mounted on the mounting substrate via these end portions.
- the exposed portions of the upper surface 71 and the side surface 72 are attracted to the joining member by the surface tension of the joining member.
- the area of the exposed portion of the upper surface 71 is preferably larger than the area of the exposed portion of the side surface 72.
- the exposed portion of the side surface 72 is preferably provided continuously with the exposed portion of the upper surface 71. Accordingly, when the surface acoustic wave device 1 is mounted, a bonding member such as solder is applied to the exposed portion of the upper surface 71 and heated, so that the wettability of the bonding member causes the exposed portion of the upper surface 71 and the side surface 72 to be heated.
- the bonding member is also applied to the exposed portion of the side surface 72 through a portion where the exposed portion is continuous. That is, at the time of mounting, the bonding member is naturally applied to the exposed portion of the side surface 72 only by applying the bonding member to the exposed portion of the upper surface 71 and heating.
- the surface acoustic wave device 1 according to the present embodiment is compared with the surface acoustic wave device of the comparative example.
- FIG. 3 is a cross-sectional view of a surface acoustic wave device 2 of a comparative example.
- the surface acoustic wave device 2 of the comparative example is similar to the surface acoustic wave device 1 according to the present embodiment, in which the piezoelectric substrate 11a, the IDT electrode 20, the terminal electrode 21, the wiring electrode 30a, the dielectric The body layer 40, the support layer 50a, the cover layer 60a, and the columnar electrode 70a are provided.
- the cover layer 60a is comprised from the 1st layer 61a and the 2nd layer 62a similarly to the cover layer 60 which concerns on this Embodiment.
- the surface acoustic wave device 2 of the comparative example further includes a solder bump 75.
- the columnar electrode 70a of the comparative example includes a bottom surface 73a facing one main surface of the piezoelectric substrate 11a, a top surface 71a facing the bottom surface 73a, and a side surface 72a connecting the bottom surface 73a and the top surface 71a.
- Columnar electrode 70a differs from columnar electrode 70 according to the present embodiment in that side surface 72a is not exposed to the outside and solder bump 75 is provided on upper surface 71a.
- the entire side surface 72a of the columnar electrode 70a is covered with the support layer 50a and the cover layer 60a. Therefore, in the surface acoustic wave device 2 of the comparative example, the support layer 50a and the cover layer 60a are also provided outside the columnar electrode 70a.
- the side surface 72 of the columnar electrode 70 has an exposed portion exposed to the outside, and the support layer is disposed outside the columnar electrode 70. 50 and the cover layer 60 are not disposed. Therefore, the lateral dimension L1 of the surface acoustic wave device 1 according to the present embodiment shown in FIG.
- the lateral dimension difference ⁇ L A + ⁇ L B between the surface acoustic wave device 1 and the surface acoustic wave device 2 is approximately the length of the support layer 50a disposed outside the columnar electrode 70a.
- solder bumps 75 are provided on the upper surface 71a of the columnar electrode 70a.
- solder bumps are not provided.
- the height H1 of the surface acoustic wave device 1 according to the present embodiment shown in FIG. 2 is higher than the height H1 + ⁇ H of the surface acoustic wave device 2 of the comparative example shown in FIG. It can be lowered by ⁇ H.
- the height of the solder bump is, for example, about 60 ⁇ m or more and 100 ⁇ m or less. Therefore, in the surface acoustic wave device 1 according to the present embodiment, the surface acoustic wave device using solder bumps For example, the height can be reduced to about 60 ⁇ m or more and 100 ⁇ m or less.
- a reduction in size and a reduction in height can be realized.
- the surface acoustic wave device 1 according to the present embodiment is mounted on a mounting substrate or the like via two surfaces, that is, the exposed portion of the upper surface 71 and the exposed portion of the side surface 72 of the columnar electrode 70.
- the surface acoustic wave device 2 of the comparative example is mounted on a mounting board or the like only through the upper part of the solder bump shown in FIG. For this reason, according to the surface acoustic wave device 1 according to the present embodiment, the mounting strength can be improved as compared with the case where the surface acoustic wave device 2 of the comparative example is used.
- FIG. 4 is a cross-sectional view showing each manufacturing process of the surface acoustic wave device 1 according to the present embodiment.
- the IDT electrode 20 and the terminal electrode 21 for exciting the surface acoustic wave are formed on one main surface of the piezoelectric substrate base material 10.
- a resist pattern is formed on one main surface of the piezoelectric substrate base material 10 using a photolithography technique.
- the resist pattern is removed to form the IDT electrode 20 and the terminal electrode 21.
- the piezoelectric substrate base material 10 is a base material of the piezoelectric substrate 11 included in the surface acoustic wave device 1.
- the thickness of the piezoelectric substrate base material 10 is not particularly limited, but in the present embodiment, the piezoelectric substrate base material 10 has a thickness of about 100 ⁇ m or more and 150 ⁇ m or less.
- the piezoelectric substrate base material 10 is, for example, a 42 ° Y-cut LiTaO 3 substrate.
- a conductive film for forming the IDT electrode 20 and the terminal electrode 21 a Ti film and an AlCu film are formed from the piezoelectric substrate base material 10 side by a vacuum deposition method.
- As the AlCu film for example, an Al alloy film containing 1% Cu can be used.
- the terminal electrode 21 may be formed simultaneously with the IDT electrode 20 or may be formed separately.
- a wiring electrode 30 electrically connected to the IDT electrode 20 is formed on one main surface of the piezoelectric substrate base material 10.
- a resist pattern is formed on one main surface of the piezoelectric substrate base material 10 using a photolithography technique.
- the wiring pattern 30 is formed by removing the resist pattern.
- a conductive film for forming the wiring electrode 30 a Ti film, a Pt film, and a Ti film are formed from the piezoelectric substrate base material 10 side by a vacuum deposition method.
- a dielectric layer 40 that covers the IDT electrode 20 is formed on the piezoelectric substrate base material 10.
- a SiO 2 film is formed on the entire piezoelectric substrate base material 10 by sputtering or the like.
- a resist pattern is formed on the region where the IDT electrode 20 is formed, and the SiO 2 film in the region where the resist is not formed is etched away by CF 4 plasma or the like. Subsequently, the resist pattern is removed.
- the support layer 50 is made of polyimide.
- a photosensitive polyimide film is formed on the piezoelectric substrate base material 10, and the pattern of the support layer 50 is formed by a photolithography method.
- the thickness of the support layer 50 is, for example, about 10 ⁇ m to 15 ⁇ m.
- the support layer 50 is formed on the wiring electrode 30 as shown in the sectional view (d) of FIG.
- a cover layer 60 that covers the IDT electrode 20 is provided on the support layer 50.
- a sheet-like composite material that has been laminated in advance which is composed of two layers of a first layer 61 and a second layer 62, is attached as the cover layer 60, and then bonded.
- the present embodiment is not limited to a cover layer composed of two layers, and a cover layer composed of one layer may be used.
- the first layer 61 is made of epoxy, for example.
- the second layer 62 is made of polyimide, for example, and the first layer 61 is bonded to the second layer 62.
- a through hole 70h for forming the columnar electrode 70 is formed.
- a laser is irradiated from the cover layer 60 side to a portion where the cover layer 60, the support layer 50, and the wiring electrode 30 overlap.
- a through hole 70h is formed by removing a part of the cover layer 60 and the support layer 50, and the wiring electrode 30 is exposed to the cover layer 60 side.
- a columnar conductive member 70g is formed in the through hole 70h.
- a portion other than the through-hole 70h portion is covered with a resist pattern.
- Ni electrolytic plating is performed to grow the columnar conductive member 70g in a portion not covered with the resist pattern (that is, a portion removed by the above-described laser).
- the resist pattern is removed.
- the columnar electrode 70 is formed by cutting the columnar conductive member 70 g in a direction intersecting one main surface of the piezoelectric substrate base material 10.
- the columnar conductive member 70g, the piezoelectric substrate base material 10 and the like are diced and cut substantially perpendicular to one main surface of the piezoelectric substrate base material 10.
- the piezoelectric substrate base material 10 and members on the main surface thereof are removed over the width of the dicer cutting allowance D1. For this reason, it is necessary to determine the dimensions of the columnar conductive member 70g on the piezoelectric substrate base material 10 in consideration of the cutting allowance D1.
- the surface acoustic wave device 1 including the columnar electrode 70 and the piezoelectric substrate 11 can be manufactured.
- the formation method of the column-shaped electrically-conductive member 70g is not limited to this.
- a method of sharing a columnar conductive member or the like between a plurality of adjacent surface acoustic wave devices 1 may be used. This method will be described with reference to the drawings.
- FIG. 5 is a cross-sectional view showing each manufacturing process of the surface acoustic wave device 1 according to the present embodiment.
- a columnar conductive member 70 ⁇ / b> A and a wiring conductive member 30 ⁇ / b> A that can be shared between a plurality of adjacent surface acoustic wave devices 1 may be formed.
- the surface acoustic wave device 1 including the columnar electrode 70 and the wiring electrode 30 is manufactured by dicing cutting as shown in the cross-sectional view (b) of FIG. be able to.
- the number of columnar conductive members 70 ⁇ / b> A can be reduced, so that the manufacturing process can be simplified.
- the method of simultaneously cutting the piezoelectric substrate base material 10 and the columnar conductive member 70g is shown, but the manufacturing method of the surface acoustic wave device 1 is not limited to this.
- a method of cutting the piezoelectric substrate base material 10 after cutting the columnar conductive member 70g in a direction intersecting one main surface of the piezoelectric substrate base material 10 may be used.
- the high-frequency module according to the present embodiment is a high-frequency module in which the surface acoustic wave device 1 according to the first embodiment is mounted on a mounting substrate.
- the high-frequency module according to the present embodiment will be described with reference to the drawings.
- FIG. 6 is a cross-sectional view showing the configuration of the high-frequency module 100 according to the present embodiment.
- the high-frequency module 100 includes the surface acoustic wave device 1 according to the first embodiment, the mounting substrate 110, and the bonding member 200.
- the mounting substrate 110 includes land electrodes 120 on one main surface. In addition to the surface acoustic wave device 1, another electronic device (not shown) is mounted on the mounting substrate 110.
- the material constituting the mounting substrate 110 is not particularly limited.
- the mounting board 110 is, for example, a printed board in which land electrodes 120 are printed on a ceramic multilayer board, a glass epoxy board, or the like.
- the land electrode 120 is an electrode on which the surface acoustic wave device 1 is mounted.
- the columnar electrode 70 of the surface acoustic wave device 1 is connected to the land electrode 120. More specifically, the columnar electrode 70 is connected to the land electrode 120 through the exposed portion of the upper surface 71 and the exposed portion of the side surface 72. As shown in FIG. 6, the columnar electrode 70 and the land electrode 120 are connected by a bonding member 200.
- the joining member 200 is a conductive member that joins the columnar electrode 70 and the land electrode 120.
- the material which comprises the joining member 200 is not specifically limited.
- the joining member 200 may be, for example, solder, a conductive adhesive, or the like.
- the columnar electrode 70 is connected to the land electrode 120 via the bonding member 200 at the exposed portion of the upper surface 71, and is landed via the fillet-shaped bonding member 200 at the exposed portion of the side surface 72. Connected to electrode 120.
- the above-described fillet-shaped joining member 200 is obtained, for example, after the joining member 200 made of solder or the like is melted by heating in a state where the surface acoustic wave device 1 is disposed on the mounting substrate 110 in a reflow process. It is naturally formed by cooling and solidifying.
- the surface acoustic wave device 1 is connected to the land electrode 120 of the mounting substrate 110 by the bonding member 200 through the exposed portion of the upper surface 71 and the exposed portion of the side surface 72 of the columnar electrode 70. Is done. Thereby, mounting strength can be improved compared with the case where it mounts on a mounting board etc. via a solder bump.
- the high-frequency module 100 can be reduced in height as compared with the case where the surface acoustic wave device 2 of the comparative example is used.
- the surface acoustic wave device 1 is downsized as described in the first embodiment, so that the mounting area of the surface acoustic wave device 1 in the high-frequency module 100 can be reduced.
- the exposed portion of the columnar electrode includes a connection electrode made of a conductive material different from the material constituting the columnar electrode. This is different from the surface acoustic wave device 1 according to the first embodiment.
- the surface acoustic wave device according to the present embodiment will be described with reference to the drawings with a focus on differences from the surface acoustic wave device 1 according to the first embodiment.
- FIG. 7 is a cross-sectional view of the surface acoustic wave device 1a according to the present embodiment.
- the surface acoustic wave device 1a includes a connection electrode 80 in addition to the surface acoustic wave device 1 according to the above embodiment.
- the connection electrode 80 is an electrode that is provided on the exposed portion of the upper surface 71 and the exposed portion of the side surface 72 of the columnar electrode 70 and is made of a conductive material that is different from the material that forms the columnar electrode 70.
- a material such as a bonding member such as solder used for mounting the surface acoustic wave device 1a on a mounting substrate or the like and a material having a high bonding strength with the material constituting the columnar electrode 70 is selected. Is done. Accordingly, the bonding strength between the columnar electrode 70 and the bonding member can be improved as compared with the case where the columnar electrode 70 and the bonding member such as solder are directly bonded. Therefore, the mounting strength of the surface acoustic wave device 1a can be improved.
- connection electrode 80 is appropriately selected according to the material constituting the joining member used when the surface acoustic wave device 1a is mounted on the mounting substrate and the material constituting the columnar electrode 70.
- the joining member is made of solder and the columnar electrode 70 is made of Ni, Au, Ag, or the like may be selected as the connection electrode 80.
- the method for forming the connection electrode 80 is not particularly limited.
- the connection electrode 80 may be formed on the exposed portion of the columnar electrode 70 by a method such as electrolytic plating.
- the thickness of the connection electrode 80 is not particularly limited, but the thickness of the connection electrode 80 is preferably smaller in order to reduce the height of the surface acoustic wave device 1a.
- the thickness of the connection electrode 80 is preferably 0.1 ⁇ m or more and 1 ⁇ m or less.
- connection electrode 80 is not necessarily provided on both the exposed portion of the upper surface 71 and the exposed portion of the side surface 72.
- the connection electrode 80 may be provided on at least one of the exposed portion of the upper surface 71 and the exposed portion of the side surface 72.
- the connection electrode 80 may not be provided on the entire exposed portion of the upper surface 71 and the exposed portion of the side surface 72.
- the connection electrode 80 may be provided on at least a part of the exposed portion of the upper surface 71 and the exposed portion of the side surface 72.
- the exposed portion of the upper surface 71 and the exposed portion of the side surface 72 of the columnar electrode 70 are made of a conductive material different from the material constituting the columnar electrode 70.
- a connection electrode 80 is provided.
- connection electrode 80 When the connection electrode 80 is provided in this way, the mounting strength when the surface acoustic wave device 1a is mounted on a mounting substrate or the like can be improved by appropriately selecting the conductive material constituting the connection electrode 80. That is, by selecting a material that strongly joins both the joining member such as solder used for mounting and the material constituting the columnar electrode 70 as the material constituting the connection electrode 80, the mounting strength of the surface acoustic wave device 1a is increased. Can be improved. In addition, since the connection electrode 80 is provided, it is not necessary to consider the bonding strength between the materials constituting the bonding member and the columnar electrode, so that the degree of freedom in selecting each material can be improved.
- connection electrode 80 may be provided. Thereby, since the surface area of the connection electrode 80 can be expanded, the mounting strength between the surface acoustic wave device 1a and the mounting substrate can be improved. In addition, in consideration of each material constituting the wiring electrode 30 and the terminal electrode 21, the material constituting the connection electrode 80 may be selected so that the mounting strength can be further improved.
- Embodiment 4 a surface acoustic wave device according to Embodiment 4 and a high-frequency module on which the surface acoustic wave device is mounted will be described.
- the upper surface of the columnar electrode is more than the main surface facing the outside of the cover layer. A structure with a small distance from the main surface is provided.
- a surface acoustic wave device according to the present embodiment and a high-frequency module on which the surface acoustic wave device is mounted will be described with reference to the drawings.
- FIG. 8 is a cross-sectional view of the surface acoustic wave device 1b according to the present embodiment.
- FIG. 9 is a cross-sectional view showing the configuration of the high-frequency module 100b on which the surface acoustic wave device 1b according to the present embodiment is mounted.
- the high-frequency module 100 b according to the present embodiment includes the surface acoustic wave device 1 b, the mounting substrate 110, and the bonding member 200, similarly to the high-frequency module 100 according to the second embodiment.
- the surface acoustic wave device 1b according to the present embodiment is different from the surface acoustic wave device 1 according to the first embodiment in the configuration of the columnar electrode 70b.
- the columnar electrode 70b according to the present embodiment includes a bottom surface 73b, a top surface 71b facing the bottom surface 73b, and a side surface 72b connecting the bottom surface 73b and the top surface 71b.
- the upper surface 71 b has a configuration in which the distance from the main surface of the piezoelectric substrate 11 is smaller than the main surface 63 facing the outside of the cover layer 60.
- the upper surface 71 b of the columnar electrode 70 b can be disposed at a position lower than the main surface 63 of the cover layer 60. That is, a step can be provided between the main surface 63 of the cover layer 60 and the upper surface 71b of the columnar electrode 70b.
- the bonding member 200 that connects the columnar electrode 70b and the mounting substrate 110 is connected from the main surface 63 of the upper surface 71b as shown in FIG. It can arrange
- the height of the surface acoustic wave device 1b alone is equal to the height of the surface acoustic wave device 1 according to the first embodiment.
- the high-frequency module 100b on which the surface acoustic wave device 1b is mounted can be made shorter than the high-frequency module 100 according to the second embodiment.
- the main surface 63 facing the outside of the cover layer 60 of the surface acoustic wave device 1b is brought into contact with the mounting substrate 110. Can be made.
- the high-frequency module 100b can be further reduced in height. Further, with the above configuration, heat can be radiated from the surface acoustic wave device 1 b to the mounting substrate 110 through the main surface 63 of the cover layer 60. For this reason, even when a large power is input to the IDT electrode 20 of the surface acoustic wave device 1b, the temperature rise of the surface acoustic wave device 1b can be suppressed. Therefore, the characteristic change of the surface acoustic wave device 1b due to the temperature rise can be suppressed.
- the surface acoustic wave device 1b according to the fourth embodiment may be provided with the connection electrode 80 according to the third embodiment.
- each columnar electrode has two exposed portions that are substantially orthogonal to each other. Just be fine.
- all the columnar electrodes have an exposed portion, but only some of the columnar electrodes may have an exposed portion.
- the dielectric layer 40 covering the IDT electrode 20 and the wiring electrode 30 is provided, but the dielectric layer 40 may not be provided.
- the main surface 63 of the cover layer 60 is brought into contact with the mounting substrate 110 by disposing the upper surface 71b of the columnar electrode 70b at a position lower than the main surface 63 of the cover layer 60.
- the configuration in which the main surface 63 of the cover layer 60 is in contact with the mounting substrate 110 is not limited to this.
- the cover layer 60 can be brought into contact with the mounting substrate.
- a protrusion may be provided on the mounting substrate.
- the present invention can be widely used in communication devices such as mobile phones as a surface acoustic wave device that is small and low in profile and has high mounting strength.
Abstract
Description
[弾性表面波装置の全体構成]
まず、実施の形態1に係る弾性表面波装置について、図面を用いて説明する。
続いて、本実施の形態に係る弾性表面波装置1における効果の理解のために、本実施の形態に係る弾性表面波装置1と、比較例の弾性表面波装置とを対比する。
続いて、本実施の形態に係る弾性表面波装置1の製造方法について図面を用いて説明する。
続いて、実施の形態2に係る高周波モジュールについて説明する。本実施の形態に係る高周波モジュールは、上記実施の形態1に係る弾性表面波装置1が実装基板に実装された高周波モジュールである。以下、本実施の形態に係る高周波モジュールについて、図面を用いて説明する。
続いて、実施の形態3に係る弾性表面波装置について説明する。本実施の形態に係る弾性表面波装置は、実装強度をさらに向上するために、柱状電極の露出部に、柱状電極を構成する材料と異なる導電材料から構成される接続電極を備える点において、上記実施の形態1に係る弾性表面波装置1と相違する。以下、本実施の形態に係る弾性表面波装置について、上記実施の形態に1に係る弾性表面波装置1との相違点を中心に、図面を用いて説明する。
続いて、実施の形態4に係る弾性表面波装置及びそれが実装された高周波モジュールについて説明する。本実施の形態に係る弾性表面波装置においては、さらなる低背化、及び、放熱特性の向上を実現するために、柱状電極の上面は、カバー層の外部に面する主面より、圧電基板の主面からの距離が小さい構成を備える。以下、本実施の形態に係る弾性表面波装置及びそれが実装された高周波モジュールについて、図面を用いて説明する。
以上、本発明の各実施の形態に係る弾性表面波装置について説明したが、本発明は、個々の実施の形態には限定されない。例えば、上記各実施の形態に次のような変形を施した態様も、本発明に含まれ得る。
10 圧電基板母材
11、11a 圧電基板
20 IDT電極
21 端子電極
30、30a 配線電極
30A 配線導電部材
40 誘電体層
50、50a 支持層
60、60a カバー層
61、61a 第一層
62、62a 第二層
63 主面
70、70a、70b 柱状電極
70h スルーホール
70g、70A 柱状導電部材
71、71a、71b 上面
72、72a、72b 側面
73、73a、73b 底面
75 半田バンプ
80 接続電極
90 空隙
100、100b 高周波モジュール
110 実装基板
120 ランド電極
200 接合部材
Claims (8)
- 圧電基板と、
前記圧電基板の一方の主面上に設けられ、弾性表面波を励振するIDT電極と、
前記一方の主面上の前記IDT電極が設けられた領域の周囲に立設され、前記IDT電極より前記一方の主面からの高さが大きい支持層と、
前記支持層上に配置され、前記IDT電極を覆うカバー層と、
前記一方の主面上であって、前記支持層に接する位置に立設され、前記IDT電極と電気的に接続される柱状電極とを備え、
前記圧電基板、前記支持層及び前記カバー層によって内部空間が形成され、
前記柱状電極は、前記一方の主面に対向する底面と、上面と、前記底面と前記上面とを結ぶ側面と、を備え、前記上面及び前記側面の各々は、外部に露出されている露出部を有する
弾性表面波装置。 - 前記上面の露出部の面積は、前記側面の露出部の面積より大きい
請求項1に記載の弾性表面波装置。 - 前記側面の露出部は、前記上面の露出部と連続して設けられている
請求項1又は2に記載の弾性表面波装置。 - 前記上面の露出部及び前記側面の露出部の少なくとも一方に、前記柱状電極を構成する材料と異なる導電材料から構成される接続電極が設けられる
請求項1~3のいずれか1項に記載の弾性表面波装置。 - 前記柱状電極の前記上面は、前記カバー層の外部に面する主面より、前記一方の主面からの距離が小さい
請求項1~4のいずれか1項に記載の弾性表面波装置。 - 請求項1~5のいずれか1項に記載の弾性表面波装置と、
前記弾性表面波装置が実装されるランド電極が設けられた実装基板とを備え、
前記柱状電極は、前記上面の露出部及び前記側面の露出部を介して、前記ランド電極に接続される
高周波モジュール。 - 前記カバー層は、前記実装基板と接触している
請求項6に記載の高周波モジュール。 - 弾性表面波装置の製造方法であって、
圧電基板母材の一方の主面上に弾性表面波を励振するIDT電極を設ける工程と、
前記一方の主面上の前記IDT電極が設けられた領域の周囲に、前記一方の主面からの高さが、前記IDT電極より大きい支持層を立設する工程と、
前記支持層上に、前記IDT電極を覆うカバー層を設ける工程と、
前記一方の主面上に、前記IDT電極と電気的に接続され、前記支持層及び前記カバー層を貫通する柱状導電部材を立設する工程と、
前記一方の主面に交差する方向に前記柱状導電部材を切断することによって、柱状電極を形成する工程とを含む
弾性表面波装置の製造方法。
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