WO2010097898A1 - 圧電振動子、圧電振動子の実装体、及び圧電振動子の製造方法 - Google Patents
圧電振動子、圧電振動子の実装体、及び圧電振動子の製造方法 Download PDFInfo
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- WO2010097898A1 WO2010097898A1 PCT/JP2009/053327 JP2009053327W WO2010097898A1 WO 2010097898 A1 WO2010097898 A1 WO 2010097898A1 JP 2009053327 W JP2009053327 W JP 2009053327W WO 2010097898 A1 WO2010097898 A1 WO 2010097898A1
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- external electrode
- piezoelectric vibrator
- substrate
- electrode portion
- lead
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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
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
- H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
- H03H9/1021—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 the BAW device being of the cantilever type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
Definitions
- the present invention relates to a piezoelectric vibrator, a piezoelectric vibrator mounting body, and a method of manufacturing the piezoelectric vibrator.
- a piezoelectric vibrator using a crystal or the like as a timing source such as a time source or a control signal, a reference signal source, or the like is used in a mobile phone or a portable information terminal device.
- Various piezoelectric vibrators of this type are known, and one of them is a surface-mount type piezoelectric vibrator.
- As this main piezoelectric vibrator a three-layer structure type in which a piezoelectric substrate on which a piezoelectric vibrating piece is formed is joined so as to be sandwiched from above and below by a base substrate and a lid substrate is known. In this case, the piezoelectric vibrating piece is accommodated in a cavity (sealed chamber) formed between the base substrate and the lid substrate.
- This type of piezoelectric vibrator has a two-layer structure in which a base substrate and a lid substrate are directly joined, and a piezoelectric vibrating piece is accommodated in a cavity formed between the two substrates.
- This two-layer structure type piezoelectric vibrator is excellent in that it can be made thinner than the three-layer structure, and is preferably used.
- the piezoelectric vibrator is configured in a positional relationship in which the through electrode portion is sandwiched between the wiring metals and is filled in the thickness direction of the base substrate. This makes it easy to route the wiring electrode by connecting the wiring metal exposed to the outside of the piezoelectric vibrator (external electrode part) and the wiring metal exposed inside the cavity (internal electrode part) through the shortest path. It is to make it. JP-A-6-283951
- the piezoelectric vibrator and the manufacturing method thereof described in Patent Document 1 since the through electrode portion and the external electrode portion are in a positional relationship where they are filled in the thickness direction of the base substrate, the piezoelectric vibrator is mounted on the wiring board.
- the bending stress applied to the piezoelectric vibrator is concentrated on the through electrode portion when the bending stress is generated on the wiring board.
- the connection part of a through-hole and a through-electrode part may be broken by the stress concentrated on the through-electrode part. For this reason, there is a problem in that outside air flows in the cavity and affects the quality of the piezoelectric vibrator.
- the piezoelectric vibrator of the present invention is formed on the first substrate, which is housed in the cavity, and is formed by bonding a first substrate and a second substrate so as to form a cavity therebetween.
- An electrode part is arranged so as not to be filled in the external electrode part in the thickness direction of the first substrate, and one end is electrically connected to the internal electrode part and penetrates the first substrate to the other end.
- the relative positional relationship between the external electrode portion and the through electrode portion is such that the through electrode portion is not filled in the external electrode portion in the thickness direction of the first substrate.
- the external electrode portion and the through electrode portion are electrically connected by the lead wiring portion. Therefore, when a bending stress is generated in the external electrode portion, the bending stress transmitted to the through electrode portion is attenuated, and cracks in the through electrode portion are suitably suppressed.
- the piezoelectric vibrator of the present invention preferably includes a plurality of the external electrode portions, and the through electrode portion is disposed between the plurality of external electrode portions.
- the twist of the first substrate is less than that in the region of the external electrode portion. Less than the area of the electrode part. Therefore, it can suppress that a crack arises in the connection part of a 1st board
- a step portion is provided between the external electrode portion and the lead-out wiring portion, and the maximum dimension in the thickness direction of the first substrate in the external electrode portion is the lead-out wiring. It is preferable that it is larger than the maximum dimension in the thickness direction of the first substrate in the portion. In this case, the external electrode portion protrudes from the lead wiring portion. Therefore, when connecting the external electrode part to other planar electrical contacts using solder, the solder stays on the external electrode part side with the stepped part as a boundary, and the solder leaks into the lead-out wiring part beyond the stepped part. It is suppressed from taking out. For this reason, it is suppressed that the bending stress to an external electrode part is transmitted to a penetration electrode part via solder.
- the piezoelectric vibrator of the present invention includes a chromium layer that is provided on the first substrate and includes a region of the external electrode portion and the lead-out wiring portion, and contains chromium and functions as the low affinity portion. It is preferable that the chrome layer further includes a gold layer that is further layered on the region of the external electrode portion and contains gold and functions as the high affinity portion.
- the chromium layer is disposed on the lower layer side of the external electrode portion, and the gold layer is disposed on the upper layer of the external electrode portion. Accordingly, since the contact area between the chromium layer and the gold layer is wide, the electrical connection can be ensured even if different metals are used. Furthermore, since the external electrode portion and the lead-out wiring portion are formed by laminating the gold layer on the chromium layer, the low affinity portion and the high affinity portion can be easily formed.
- a piezoelectric vibrator mounting body of the present invention includes the piezoelectric vibrator of the present invention and a wiring board having a land electrically connected to the external electrode portion, and the surface area of the external electrode portion is the land. It is characterized by being smaller than the surface area. According to this invention, since the surface area of the external electrode portion is smaller than the surface area of the land, when the solder melt is disposed between the land and the external electrode portion and the piezoelectric vibrator is mounted on the wiring board, The external electrode moves to a position near the center of the land. Therefore, positioning when mounting the piezoelectric vibrator on the wiring board is facilitated.
- the method for manufacturing a piezoelectric vibrator of the present invention includes a first step of forming a lower layer of an external electrode portion and a lead-out wiring portion by laminating a first layer containing a first metal on a substrate, and the external electrode A second step of forming an upper layer of the external electrode part by laminating a second layer containing a second metal having a higher affinity for solder than the first metal on the surface of the lower part of the part, It is characterized by providing.
- the lower layer of the external electrode portion and the lead-out wiring portion are integrally formed of the first metal, the electrical resistance is reduced.
- the second layer laminated on the surface of the lower layer of the external electrode portion has a high affinity with solder, connection by solder can be reliably performed.
- the external electrode portion and the through electrode portion are not filled in the thickness direction of the first substrate. Since they are displaced, stress concentration generated in the through electrode part via the external electrode part is suitably suppressed, and the mechanical strength of the piezoelectric vibrator when the piezoelectric vibrator is mounted on a wiring board or the like is increased. Can do. Furthermore, since the mechanical strength of the piezoelectric vibrator when mounted on a wiring board or the like can be increased, the piezoelectric vibrating piece inside the piezoelectric vibrator is hermetically sealed, and the piezoelectric vibration in the piezoelectric vibrator mounting body is sealed. Child quality can be maintained.
- FIG. 1A is a perspective view showing a piezoelectric vibrator of a first embodiment of the present invention.
- FIG. 1B is a perspective view showing the piezoelectric vibrator.
- FIG. 2A is a side sectional view of the piezoelectric vibrator.
- FIG. 2B is an enlarged side sectional view showing a part of the piezoelectric vibrator.
- FIG. 1 is a perspective view showing the piezoelectric vibrator 1.
- the piezoelectric vibrator 1 includes a box-shaped package 5 in which a base substrate (first substrate) 2 and a lid substrate (second substrate) 3 are stacked in two layers.
- the base substrate 2 and the lid substrate 3 are transparent insulating substrates made of a glass material, for example, soda-lime glass, and are formed in a plate shape having a size that can be superimposed on each other.
- a bonding film 35 is interposed between the base substrate 2 and the lid substrate 3, and the base substrate 2 and the lid substrate 3 are airtightly bonded.
- two external electrode portions 38a and 38b are provided on the outer surface of the base substrate 2 so as to be spaced apart from both ends in the longitudinal direction.
- lead wiring portions 40a and 41a extending between the external electrode portions 38a and 38b along the outer surface of the base substrate 2 are formed.
- FIG. 2 is a side sectional view of the piezoelectric vibrator 1.
- a recess 3 a is formed in the lid substrate 3, and a cavity C is formed between the base substrate 2 and the lid substrate 3.
- the internal electrode portions 36 and 37 formed on the base substrate 2 and the piezoelectric vibrating reed 4 electrically connected to the internal electrode portions 36 and 37 are housed.
- a metal bump B is used for connection between the internal electrode portions 36 and 37 and the piezoelectric vibrating piece 4.
- a material having electrical conductivity such as solder or gold can be used.
- the base substrate 2 is provided with through-electrode portions 32 and 33 that are disposed so as to penetrate in the thickness direction of the base substrate 2.
- One end of each of the through electrode portions 32 and 33 is electrically connected to the internal electrode portions 36 and 37, and the other end is formed on the outer surface of the base substrate 2 and is electrically connected to the lead wiring portions 40a and 41a. ing.
- FIG. 2B is a side cross-sectional view showing an enlarged part of the piezoelectric vibrator 1.
- the external electrode portion 38a provided on the base substrate 2 has a two-layer structure, and is formed on the base substrate 2 and is a first layer integrated with the lead-out wiring portion 40a. 40 (lower layer) and a second layer 38 (upper layer) formed by being stacked on the first layer 40. Accordingly, a stepped portion 38c is formed between the lead wiring portion 40a and the external electrode portion 38a.
- the stepped portion 38c can employ a configuration having an end surface that is substantially along the thickness direction of the base substrate 2, but the end surface may be inclined.
- the through electrode portion 32 includes a conductive core portion 7 and a cylindrical body 6 filled around the core portion 7 in through holes 30 and 31 penetrating in the thickness direction of the base substrate 2.
- the through holes 30 and 31 are formed as frustoconical holes in which the inner diameter of the base substrate 2 on the cavity C side is narrowed.
- the cylindrical body 6 is for supporting the core part 7 and sealing the through holes 30 and 31, and can be formed by firing, for example, a paste-like glass frit.
- the positional relationship of the through electrode portion 33 is also arranged so as not to fill the external electrode portion 39a in the thickness direction of the base substrate 2 in the same manner as the positional relationship of the through electrode portion 32 described above.
- the external electrode portions 38a and 38b have high affinity portions 38b and 39b that are connected to lands such as a wiring board when the piezoelectric vibrator 1 is mounted on the wiring board or the like and have an affinity for solder.
- the lead-out wiring portions 40a and 41a have low affinity portions 40b and 41b that have a relatively low affinity for solder with respect to the high affinity portions 38b and 39b.
- At least the high affinity portions 38b and 39b of the external electrode portions 38a and 38b are gold layers containing gold, have high electrical conductivity and corrosion resistance, and are easy to be soldered.
- at least the low-affinity portions 40b and 41b of the lead-out wiring portions 40a and 41a are chromium layers containing chromium, and have high electrical conductivity and easily repel solder due to the interfacial tension acting between the solder and the chromium layer. .
- FIG. 3 is an exploded perspective view showing the piezoelectric vibrator 1.
- the internal electrode portions 36 and 37 are connected to the through-electrode portions 32 and 33 along the base substrate 2 through the lead wiring portions 36a and 37a, respectively.
- the piezoelectric vibrating piece 4 is a tuning fork type vibrating piece formed of a piezoelectric material such as quartz, lithium tantalate, or lithium niobate, and vibrates when a predetermined voltage is applied.
- the piezoelectric vibrating reed 4 includes a pair of vibrating arm portions 10 and 11 arranged in parallel, and a base portion 12 that integrally fixes the base end sides of the pair of vibrating arm portions 10 and 11.
- the piezoelectric vibrating reed 4 of the present embodiment is formed on both main surfaces of the pair of vibrating arm portions 10 and 11 from the base end side of the vibrating arm portions 10 and 11 along the longitudinal direction of the vibrating arm portions 10 and 11.
- a groove portion 18 is formed in each of up to approximately the middle. The groove 18 is for further suppressing the vibration loss of the piezoelectric vibrating piece 4 and further improving the vibration characteristics.
- FIG. 4 is a side view showing a partial configuration of a part of the mounting structure 101 of the piezoelectric vibrator on which the piezoelectric vibrator 1 is mounted.
- the piezoelectric vibrator 1 described above is mounted by connecting the external electrode portions 38 a and 38 b to lands (for example, lands 103) provided on the surface of the wiring substrate 100.
- the land 103 can suitably employ an appropriate configuration having electrical conductivity, such as a land formed of general thin copper or the like.
- Solder 102 is interposed between the external electrode portion 38 a and the land 103, and is in close contact with the high affinity portion 38 b of the external electrode portion 38 a and the surface of the land 103. Further, the surface area of the external electrode portion 38 a is smaller than the surface area of the land 103.
- the piezoelectric vibrator of the present embodiment and the mounting body and operation of the piezoelectric vibrator having the configuration described above will be described with reference to FIG.
- the external electrode portion 38 a of the piezoelectric vibrator 1 is integrally connected to the land 103 by the solder 102.
- the solder 102 spreads over the entire surface of the high affinity portion 38 b and extends to the stepped portion 38 c, but the solder 102 is repelled in the low affinity portion 40 b having a low affinity for the solder 102. Therefore, the solder 102 is not attached to the lead-out wiring part 40a having the low affinity part 40b.
- the external electrode portion 38 a (39 a) is also bent by bending the wiring substrate 100. Further, in the base substrate 2, bending stress is generated in the region of the external electrode portion 38a (39a) by the above external force. At this time, the bending stress of the base substrate 2 is highest in the region where the external electrode portion 38a (39a) is disposed, and in the thickness direction of the base substrate 2 outside the region of the external electrode portion 38a (39a). The bending stress is relatively low in the region where the external electrode portion 38a (39a) is not filled.
- the through electrode portion 32 (33) contains a material different from that of the base substrate 2, there is an interface at the connection portion. For this reason, the region of the through electrode portion 32 (33) has a lower mechanical strength against bending stress than the other regions of the base substrate 2.
- the base substrate is bent so that the through electrode portion is bent, cracks may occur when stress is concentrated on the through electrode portion having low mechanical strength.
- a gap is formed such that the outside of the package 5 and the cavity C communicate with each other, and the airtightness inside the cavity C cannot be maintained.
- the quality of the piezoelectric vibrator may vary due to the influence of outside air.
- the through electrode portion 32 (33) is disposed in a region outside the external electrode portions 38a and 38b. As described above, this region is a region where the bending stress is relatively low.
- the stress generated in the through electrode portions 32 and 33 via the external electrode portions 38a and 38b Concentration is suitably suppressed, and the mechanical strength of the piezoelectric vibrator when the piezoelectric vibrator is mounted on a wiring board or the like can be increased.
- the piezoelectric vibrating reed 4 inside the piezoelectric vibrator 1 is hermetically sealed, and the piezoelectric vibrator mounting body.
- the quality of the piezoelectric vibrator can be maintained.
- the through electrode portions 32 and 33 are disposed in the middle portion in the longitudinal direction where the bending stress when the base substrate 2 is curved is relatively low, the bending stress transmitted to the through electrode portions 32 and 33 is preferable. It is possible to suppress the occurrence of cracks at the connection portion between the base substrate and the through electrode portion.
- the external electrode portion 38 a is formed smaller than the land 103, the melted solder 102 is disposed between the land 103 and the external electrode portion 38 a and the piezoelectric vibrator 1 is mounted on the wiring substrate 100. At this time, on the melted solder 102, the external electrode portions 38a and 39a move to positions close to the center of the land. Therefore, positioning when mounting the piezoelectric vibrator on the wiring board is facilitated.
- the through electrode portions 32 and 33 are arranged farther from both the external electrode portions 38a and 38b. If the through electrode portions 32 and 33 are arranged in the center in the longitudinal direction of the external electrode portions 38a and 38b in the base substrate, the bending stress generated in the through electrode portions 32 and 33 can be further reduced.
- FIG. 5 is a side sectional view showing a configuration of a part of the piezoelectric vibrator mounting body 201 according to the second embodiment. As shown in FIG.
- the piezoelectric vibrator mounting body 201 does not have a two-layer structure having the first layer 40 and the second layer 38 as in the first embodiment, but includes an external electrode portion and a lead-out wiring portion.
- the configuration is different from that of the first embodiment in that the electrode layer 238 is made of the same material and formed integrally.
- the electrode layer 238 is provided with an external electrode portion 238a and a lead wiring portion 240a.
- the external electrode portion 238a and the lead-out wiring portion 240a are made of a material having affinity for solder, and for example, gold can be used.
- the stepped portion 238c corresponding to the stepped portion 38c of the first embodiment is a step generated by changing the thicknesses of the external electrode portion 238a and the lead-out wiring portion 240a in the thickness direction of the base substrate 2. is there.
- both the external electrode portion 238 a and the lead-out wiring portion 240 a have an affinity for the solder 202, so when the land 103 and the external electrode portion 238 a are connected by the solder 202, The portion extends beyond the stepped portion 238c to the lead-out wiring portion 240a. However, due to the surface tension of the solder 202, the solder 202 does not spread over the entire surface of the lead-out wiring portion 240a but remains in the vicinity of the stepped portion 238c.
- the transmission of bending stress to the through electrode portion 32 via the solder 202 is suppressed, and cracks due to stress concentration at the connection portion between the through electrode portion 32 and the base substrate 2 are prevented. Can be suppressed.
- the lead-out wiring part 240a is separated from the wiring board 100 by at least the stepped part 238c, the wiring board and the lead-out wiring part are in direct contact when the wiring board is curved as in the first embodiment. It is suppressed.
- the external electrode portion 238a and the lead wiring portion 240a can be made of the same material, the configuration can be simplified.
- FIG. 6 is a flowchart showing a method for manufacturing the piezoelectric vibrator 1 of the first embodiment.
- the piezoelectric vibrator manufacturing method of the present embodiment is a lower layer of the external electrode unit by laminating a first layer containing a first metal on a glass substrate such as a base substrate 2.
- first step S1 for forming the lead-out wiring portion, and a second layer containing a second metal having a higher affinity for the solder than the first metal is laminated on the surface of the lower layer of the external electrode portion.
- second step S2 for forming an upper layer of the external electrode portion can be performed by suitably selecting a method such as a sputtering method, a vacuum deposition method, or photolithography.
- a chromium layer containing chromium is formed in the first layer
- a gold layer containing gold is formed in the second layer.
- the first layer may be made of chromium alone
- the second layer may be made of gold alone.
- the lower layer of the external electrode portion and the lead-out wiring portion are integrally formed of the first metal, so that the physical connection is ensured, and the electrical resistance Has been reduced. Furthermore, since the second layer laminated on the surface of the lower layer of the external electrode portion has a high affinity with solder, connection by solder can be reliably performed. In addition, since the first layer and the second layer are stacked over the entire surface of the second layer, the connection between the first layer and the second layer is strong and physical peeling is suppressed, The mechanical strength of the piezoelectric vibrator can be increased.
- the lead-out wiring part contains chromium and the external electrode part contains gold.
- the present invention is not limited to this, and the external electrode part contains nickel or copper. It can also be adopted.
- the external electrode portion is not limited to metal, and a conductive resin material or the like can also be used. Even if it is such a structure, there can exist an effect similar to this invention.
- the through electrode portion is disposed in the intermediate portion of the base substrate.
- the external electrode portion is disposed near the center of the base electrode, and the through electrode portion is the base.
- the package is curved only between the external electrode portions, and the bending stress is not transmitted to the package in the region where the through electrode portion is disposed, and the through electrode portion is cracked. There is an effect that can be suppressed.
- the penetration electrode portion can be prevented from cracking due to an external force such as bending generated in the wiring board, it can be suitably applied to the case where airtightness of the cavity is required even in an environment where bending stress is generated in the wiring board.
- Piezoelectric vibrator Base substrate (first substrate) 3 Lid board (second board) 4 Piezoelectric vibrating piece 5 Package 32, 33 Through electrode portion 36, 37 Internal electrode portion 38, 39, 238 Second layer (upper layer) 38a, 39a, 238a External electrode part 38b, 39b High affinity part (gold layer) 38c, 238c Stepped portion 40, 41 First layer (lower layer) 40a, 41a, 240a Lead-out wiring part 40b, 41b Low affinity part (chromium layer) 100 wiring board C cavity S1 first process S2 second process
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Abstract
Description
本発明の圧電振動子は、第1の基板と第2の基板とが、間にキャビティを形成するように接合されて構成されたパッケージと、前記キャビティ内に収容され前記第1の基板に形成された内部電極部と、前記キャビティ内に封止されると共に、前記キャビティ内で前記内部電極部に電気的に接続された圧電振動片と、前記第1の基板の外表面に形成された外部電極部と、前記第1の基板の厚さ方向において前記外部電極部に充積されないように配置され一端が前記内部電極部に電気的に接続され、前記第1の基板を貫通して他端が前記第1の基板の外表面に形成された貫通電極部と、前記貫通電極部と前記外部電極部とを電気的に接続する引き出し配線部と、を備えることを特徴としている。
この場合、第1の基板において複数の外部電極部の間の領域は外部電極部に曲げ応力が生じた際に第1の基板の捩じれが外部電極部の領域よりも少ないため、曲げ応力が外部電極部の領域よりも少ない。従って、第1の基板と貫通電極部との接続部分において割れが生じるのを抑制することができる。
この場合、外部電極部が引き出し配線部よりも突出されている。従って、ハンダを用いて外部電極部を面状の他の電気接点に接続する際に、ハンダは段差部を境にして外部電極部側に留まり、ハンダが段差部を超えて引き出し配線部に漏れ出すことが抑制されている。このため、外部電極部への曲げ応力がハンダを介して貫通電極部へと伝わることが抑制される。
この場合、高親和部においては上述の他の電気接点との電気的な接続性が高められている一方、低親和部へはハンダが乗りにくくなっている。従って、外部電極部への曲げ応力がハンダを介して貫通電極部側へと伝わることが抑制されている。このため、引き出し配線部にハンダを付けないための厳密な制御を必要とせずに圧電振動子を実装することができる。
この場合、クロム層が外部電極部の下層側に配置され、金層が外部電極部の上層に配置されている。従って、クロム層と金層との接触面積が広いので異種金属を用いても電気的な接続を確実にすることができる。さらに、クロム層への金層の積層によって外部電極部と引き出し配線部とが形成されるので低親和部と高親和部とを容易に形成することができる。
この発明によれば、ランドの表面積よりも外部電極部の表面積が小さいので、ランドと外部電極部との間にハンダの溶融物を配置して配線基板上で圧電振動子を実装する際に、外部電極部がランドの中央に寄る位置へと移動する。従って圧電振動子を配線基板上に実装する際の位置決めが容易になる。
この発明によれば、外部電極部の下層と引き出し配線部とは第1の金属によって一体に形成されているので電気抵抗が低減されている。さらに、外部電極部の下層の表面に積層された第2層はハンダとの親和性が高いのでハンダによる接続を確実に行うことができる。
以下、本発明の第1実施形態の圧電振動子及び圧電振動子の実装体について図1から図4を参照して説明する。
図1は、圧電振動子1を示す斜視図である。図1(A)に示すように、圧電振動子1は、ベース基板(第1の基板)2とリッド基板(第2の基板)3とで2層の積層された箱状のパッケージ5が構成されている。ベース基板2及びリッド基板3は、ガラス材料、例えばソーダ石灰ガラスからなる透明な絶縁基板であり、互いに重ね合わせ可能な大きさで板状に形成されている。また、ベース基板2とリッド基板3との間には、接合膜35が介在されており、ベース基板2とリッド基板3とが気密に接合されている。
また、外部電極部38a、38bは、圧電振動子1が配線基板等に実装される際に配線基板等のランドに接続され、ハンダに対して親和性を有する高親和部38b、39bを有する。一方、引き出し配線部40a、41aは高親和部38b、39bに対して相対的にハンダに対する親和性が低い低親和部40b、41bを有する。
また、本実施形態の圧電振動片4は、一対の振動腕部10、11の両主面上に、振動腕部10、11の長手方向に沿って振動腕部10、11の基端側から略中間付近までのそれぞれに形成された溝部18を備えている。この溝部18は、圧電振動片4の振動損失をより抑えて振動特性をさらに向上させるためのものである。
また、外部電極部38aとランド103との間には、ハンダ102が介在されており、外部電極部38aの高親和部38bとランド103の表面とのそれぞれに密着されている。また、外部電極部38aの表面積はランド103の表面積よりも小さくなっている。
図4に示すように、配線基板100上に圧電振動子1が実装された状態では、ハンダ102によって圧電振動子1の外部電極部38aはランド103と一体的に接続されている。
また、ハンダ102は、高親和部38bの全面に広がり、段差部38cまでは広がるが、ハンダ102に対して親和性が低い低親和部40bにおいてはハンダ102がはじかれている。従って、低親和部40bを有する引き出し配線部40aにはハンダ102が付着していない。
また、配線基板100と引き出し配線部40a(41a)とは少なくとも段差部38cの分だけ離間しているので、引き出し配線部40a(41a)に配線基板100が接触することは抑制されている。
また、貫通電極部32、33が、ベース基板2が湾曲された際の曲げ応力が相対的に低い長手方向の中間部に配置されているので、貫通電極部32、33に伝わる曲げ応力が好適に低減されておりベース基板と貫通電極部との接続部分において割れが生じるのを抑制することができる。
さらに、段差部38cが設けられているため、圧電振動子1が配線基板100に実装された際には配線基板100と引き出し配線部40aとの間に空隙が生じている。従って配線基板100が湾曲された際にも配線基板100と引き出し配線部40aとが直接接触することが抑制されている。その結果、配線基板が湾曲された際の曲げ応力が直接貫通電極部に伝わるのを抑制することができる。
次に、本発明の第2実施形態の圧電振動子の実装体について図5を参照して説明する。なお、以下に説明する各実施形態において、上述した第1実施形態の圧電振動子1及び圧電振動子の実装体101と構成を共通とする箇所には同一符号を付けて、説明を省略することにする。
図5は、第2実施形態の圧電振動子の実装体201の一部の構成を示す側面断面図である。図5に示すように、圧電振動子の実装体201は、第1実施形態のような第1層40と第2層38とを有する2層構造ではなく、外部電極部と引き出し配線部とが同一の材料からなり一体に形成された電極層238を有する点において第1実施形態と構成が異なっている。
さらに、外部電極部238aと引き出し配線部240aとを同一の素材で構成することができるので構成を簡略化することができる。
次に、本発明の圧電振動子の製造方法について図6を参照して説明する。なお、以下では上述と同一の構成を有する部材は同一の符号を付し、説明を省略する。
図6は、第1実施形態の圧電振動子1の製造方法を示すフローチャートである。図6に示すように、本実施形態の圧電振動子の製造方法は、例えばベース基板2等のガラス基板上に、第1の金属を含有する第1層を積層することで外部電極部の下層及び引き出し配線部を形成する第一工程S1と、前記外部電極部の下層の表面に、前記第1の金属よりもハンダとの親和性が高い第2の金属を含有する第2層を積層することで外部電極部の上層を形成する第二工程S2と、を備える。
第一工程S1及び第二工程S2は、例えばスパッタ法、真空蒸着法、あるいはフォトリソクラフィー等の手法を好適に選択して行うことができる。本実施形態では、第1層にはクロムを含有するクロム層が形成され、第2層には金を含有する金層が形成される。なお、第1層はクロム単体からなるものでもよく、第2層は金単体からなるものでもよい。
例えば、本発明の各実施形態では、引き出し配線部はクロムを含有し、外部電極部は金を含有する構成を採用したが、これに限らず、外部電極部がニッケルあるいは銅を含有する構成を採用することもできる。また、外部電極部は金属に限らず、導電性樹脂材料等を用いることもできる。このような構成であっても本発明と同様の効果を奏することができる。
2 ベース基板(第1の基板)
3 リッド基板(第2の基板)
4 圧電振動片
5 パッケージ
32、33 貫通電極部
36、37 内部電極部
38、39、238 第2層(上層)
38a、39a、238a 外部電極部
38b、39b 高親和部(金層)
38c、238c 段差部
40、41 第1層(下層)
40a、41a、240a 引き出し配線部
40b、41b 低親和部(クロム層)
100 配線基板
C キャビティ
S1 第一工程
S2 第二工程
Claims (7)
- 第1の基板と第2の基板とが、間にキャビティを形成するように接合されて構成されたパッケージと、
前記キャビティ内に収容され前記第1の基板に形成された内部電極部と、
前記キャビティ内に封止されると共に、前記キャビティ内で前記内部電極部に電気的に接続された圧電振動片と、
前記第1の基板の外表面に形成された外部電極部と、
前記第1の基板の厚さ方向において前記外部電極部に充積されないように配置され一端が前記内部電極部に電気的に接続され、前記第1の基板を貫通して他端が前記第1の基板の外表面に形成された貫通電極部と、
前記貫通電極部と前記外部電極部とを電気的に接続する引き出し配線部と、
を備える圧電振動子。 - 請求項1に記載の圧電振動子であって、
複数の前記外部電極部を備え、
前記貫通電極部が複数の前記外部電極部の間に配置されている圧電振動子。 - 請求項1または2に記載の圧電振動子であって、
前記外部電極部と前記引き出し配線部との間に段差部が設けられ、
前記外部電極部における前記第1の基板の厚さ方向の最大寸法が前記引き出し配線部における前記第1の基板の厚さ方向の最大寸法よりも大きい圧電振動子。 - 請求項1~3のいずれか一項に記載の圧電振動子であって、
前記外部電極部の表面には、ハンダとの親和性を有する高親和部が設けられ、
前記引き出し配線部の表面には、ハンダとの親和性が前記高親和部よりも低い低親和部が設けられている圧電振動子。 - 請求項4に記載の圧電振動子であって、
前記第1の基板上に設けられ前記外部電極部と前記引き出し配線部との領域を含んで配置されクロムを含有し前記低親和部として機能するクロム層と、
前記クロム層のうち前記外部電極部の領域にさらに重層され金を含有し前記高親和部として機能する金層と、
を有する圧電振動子。 - 請求項1~5のいずれか一項に記載の圧電振動子と、
前記外部電極部と電気的に接続されたランドを有する配線基板と、
を備え、
前記外部電極部の表面積が前記ランドの表面積よりも小さい圧電振動子の実装体。 - 基板上に、第1の金属を含有する第1層を積層することで外部電極部の下層及び引き出し配線部を形成する第一工程と、
前記外部電極部の下層の表面に、前記第1の金属よりもハンダとの親和性が高い第2の金属を含有する第2層を積層することで外部電極部の上層を形成する第二工程と、
を備える圧電振動子の製造方法。
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JP2011501380A JP5281144B2 (ja) | 2009-02-25 | 2009-02-25 | 圧電振動子、及び圧電振動子の実装体 |
PCT/JP2009/053327 WO2010097898A1 (ja) | 2009-02-25 | 2009-02-25 | 圧電振動子、圧電振動子の実装体、及び圧電振動子の製造方法 |
CN2009801576966A CN102334288A (zh) | 2009-02-25 | 2009-02-25 | 压电振动器、压电振动器的安装体及压电振动器的制造方法 |
TW099100919A TW201042903A (en) | 2009-02-25 | 2010-01-14 | Piezoelectric transducer, piezoelectric transducer mounted body, and method for manufacturing piezoelectric transducer |
US13/196,356 US8415862B2 (en) | 2009-02-25 | 2011-08-02 | Piezoelectric vibrator, piezoelectric vibrator mounting body, and piezoelectric vibrator manufacturing method |
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PCT/JP2009/053327 WO2010097898A1 (ja) | 2009-02-25 | 2009-02-25 | 圧電振動子、圧電振動子の実装体、及び圧電振動子の製造方法 |
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JP2013074414A (ja) * | 2011-09-27 | 2013-04-22 | Seiko Instruments Inc | 電子部品の端子接続構造、パッケージ、圧電振動子、発振器、電子機器および電波時計 |
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JP6635605B2 (ja) * | 2017-10-11 | 2020-01-29 | 国立研究開発法人理化学研究所 | 電流導入端子並びにそれを備えた圧力保持装置及びx線撮像装置 |
JP6743997B1 (ja) * | 2018-12-25 | 2020-08-19 | 株式会社村田製作所 | 振動構造体 |
CN113422587A (zh) * | 2021-05-13 | 2021-09-21 | 北京七芯中创科技有限公司 | 基于多层凹嵌式基板的柱体晶振与芯片单体化封装结构 |
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CN102334288A (zh) | 2012-01-25 |
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