WO2010097909A1 - パッケージ、パッケージの製造方法、および圧電振動子の製造方法 - Google Patents
パッケージ、パッケージの製造方法、および圧電振動子の製造方法 Download PDFInfo
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- WO2010097909A1 WO2010097909A1 PCT/JP2009/053338 JP2009053338W WO2010097909A1 WO 2010097909 A1 WO2010097909 A1 WO 2010097909A1 JP 2009053338 W JP2009053338 W JP 2009053338W WO 2010097909 A1 WO2010097909 A1 WO 2010097909A1
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- Prior art keywords
- wafer
- bonding film
- substrate
- package
- corrosion
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 57
- 239000000758 substrate Substances 0.000 claims abstract description 131
- 238000005260 corrosion Methods 0.000 claims description 79
- 230000007797 corrosion Effects 0.000 claims description 79
- 238000000034 method Methods 0.000 claims description 36
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 17
- 229910052804 chromium Inorganic materials 0.000 claims description 17
- 239000011651 chromium Substances 0.000 claims description 17
- 238000005304 joining Methods 0.000 claims description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 239000010703 silicon Substances 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims 4
- -1 are bonded Substances 0.000 abstract description 2
- 235000012431 wafers Nutrition 0.000 description 72
- 239000002585 base Substances 0.000 description 39
- 239000000463 material Substances 0.000 description 11
- 239000003929 acidic solution Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 235000014676 Phragmites communis Nutrition 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000012670 alkaline solution Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
- Y10T428/1317—Multilayer [continuous layer]
Definitions
- the present invention relates to a package, a package manufacturing method, and a piezoelectric vibrator manufacturing method.
- packaged products include a base substrate and a lid substrate that are anodically bonded to each other in a stacked state and have a cavity formed therebetween, and an operating piece that is mounted on a portion of the base substrate located in the cavity. It is used.
- a piezoelectric vibrator that is mounted on a mobile phone or a portable information terminal device and uses a crystal or the like as a time source, a timing source such as a control signal, a reference signal source, or the like is known.
- Patent Document 1 describes a package manufactured by stacking and bonding substrates. According to the package described in Patent Document 1, the inside of the package can be hermetically sealed. Patent Document 1 describes that a metal or a semiconductor such as aluminum, titanium, tantalum, or silicon can be used as a bonding layer. Japanese Patent No. 362435
- the metal or the semiconductor is used as a bonding layer, and the package is cut out along a groove formed in an intermediate portion in the width direction of the bonding layer. For this reason, the bonding layer is exposed on the cut surface from which the package is cut out.
- the bonding layer may be corroded when contacted with an external environment, particularly an acid or an alkali.
- aluminum oxide (alumina) is usually formed in a film on the surface of the bonding layer exposed to the atmosphere. Corrosion of is suppressed.
- the bonding layer is surely covered with a coating material, and high processing accuracy is required to prevent the coating material from adhering to a portion such as an electrode.
- the bonding layer is configured in preference to high corrosion resistance, the bonding property between the substrates may be insufficient, and it may be difficult to maintain the quality of the package product.
- This invention is made
- a second object of the present invention is to provide a package manufacturing method and a piezoelectric vibrator manufacturing method capable of efficiently manufacturing a package capable of satisfying both bondability between substrates and corrosion resistance.
- the package of the present invention is a package in which a plurality of substrates including a first substrate and a second substrate are joined to form a cavity between the plurality of substrates, and the first substrate, the second substrate, A corrosion-resistant bonding film disposed so as to surround the cavity on the opposite surface, and an inner surface of the corrosion-resistant bonding film on the opposite surfaces of the first substrate and the second substrate. And a high-bonding bonding film having a higher bonding strength than the corrosion-resistant bonding film.
- the corrosion-resistant bonding film in the state where the first substrate and the second substrate are bonded, the corrosion-resistant bonding film is exposed to the outside of the package on the opposing surfaces of the first substrate and the second substrate, A highly bondable bonding film is exposed on the cavity side. Therefore, the high bondability bonding film is prevented from being exposed to the outside by the corrosion-resistant bonding film, and is prevented from being exposed to the atmosphere outside the package, an acidic solution, or an alkaline solution.
- the highly bondable bonding film contains aluminum.
- the aluminum having an emphasis on bondability can be selected as the highly bondable bonding film without considering the corrosion resistance.
- Aluminum is a material that has a high tendency to ionize, and has the property of dissolving when an acidic solution or the like adheres to it while in contact with other types of metals. It is suppressed. By using aluminum, the bondability between the first substrate and the second substrate is improved, and the cavity can be reliably sealed.
- the first substrate and the second substrate contain glass, and the corrosion-resistant bonding film is disposed so as to contact the surface of the first substrate; It is preferable to have a silicon layer disposed so as to be in contact with the chromium layer and the second substrate.
- both the first substrate and the second substrate are glass-based substrates, and a chromium layer is disposed on the first substrate.
- the chromium layer has high adhesion to glass, and can be easily formed as a desired pattern on the glass-based first substrate.
- the silicon layer is provided between the chromium layer and the second substrate, the chromium layer and the silicon layer are firmly bonded to each other by metal, and the silicon layer glass-based second substrate is preferably bonded by anodic bonding.
- the package manufacturing method of the present invention is a package manufacturing method in which a plurality of substrates including a first substrate and a second substrate are joined to form a cavity between the plurality of substrates.
- the second step of forming a corrosion-resistant bonding film having a lower thickness than the first bonding film and having the predetermined thickness, and the first step so as to sandwich the first bonding film and the corrosion-resistant bonding film The first wafer and the second wafer are bonded to each other at the intermediate portion in the width direction of the corrosion-resistant bonding film following the bonding step, and a bonding step in which the wafer and the second wafer are overlapped and bonded.
- the strip-shaped first bonding film is formed in the first step, and then the groove is formed in the intermediate portion in the width direction of the first bonding film in the removing step.
- the arrangement order of the cavity and the bonding film on the first wafer is the cavity, the first bonding film, the corrosion-resistant bonding film, the first It is repeated in the order of the bonding film.
- the first bonding film is located inside the corrosion-resistant bonding film, and the progress of corrosion is suppressed by the corrosion-resistant bonding film. it can.
- the method for manufacturing a piezoelectric vibrator according to the present invention is a method for manufacturing a piezoelectric vibrator in which a plurality of substrates including a first substrate and a second substrate are bonded to form a cavity between the plurality of substrates.
- a first step of forming a first bonding film having a predetermined thickness in a band shape having a predetermined width or more so as to surround the first width and an intermediate portion in the width direction of the first bonding film following the first step The surface of the first wafer removed in a narrower strip
- the first wafer and the second wafer are bonded to each other at the intermediate portion in the width direction of the corrosion-resistant bonding film following the bonding step, and a bonding step in which the wafer and the second wafer are overlapped and bonded.
- a dicing step of cutting the joined body is positioned inside the corrosion-resistant bonding film, and the progress of corrosion can be suppressed by the corrosion-resistant bonding film. For this reason, airtightness in the cavity is ensured, and stable operation of the piezoelectric vibrating piece disposed inside the cavity can be maintained regardless of the external environment of the piezoelectric vibrator.
- the package of the present invention it is possible to achieve both bondability between substrates and corrosion resistance. Moreover, according to the manufacturing method of the package of this invention, the package which can be compatible with the joining property and corrosion resistance of board
- FIG. 6 is a perspective view showing a partially broken piezoelectric vibrator manufactured by the method for manufacturing the piezoelectric vibrator. It is a flowchart which shows the manufacturing method of the same piezoelectric vibrator.
- FIG. 1 is a perspective view showing the package 1 of the present embodiment in a partially broken view.
- the package 1 is formed by bonding a plurality of substrates including a base substrate 2 (first substrate) and a lid substrate 3 (second substrate) between the base substrate 2 and the lid substrate 3.
- Cavity C is formed in
- the base substrate 2 and the lid substrate 3 are both glass-based substrates containing a glass material, and specifically, for example, a glass substrate made of soda-lime glass can be adopted.
- a corrosion-resistant bonding film 24 disposed so as to surround the cavity C, and a high bonding disposed inside the corrosion-resistant bonding film 24.
- the conductive bonding film 21 is formed.
- the high bondability bonding film 21 and the corrosion-resistant bonding film 24 are both bonding films that bond the base substrate 2 and the lid substrate 3 together.
- the high bondability bonding film 21 is a bonding film that is employed with emphasis on the strength of bonding force for bonding the base substrate 2 and the lid substrate 3, and in this embodiment, a metal material containing aluminum is used. Can be adopted.
- the high bondability bonding film 21 may be either an aluminum alloy or an aluminum simple substance.
- aluminum for example, titanium, other metal materials, or semiconductor materials can also be used for the high bondability bonding film 21 in order to increase the bonding force in accordance with the respective compositions of the base substrate 2 and the lid substrate 3. It is possible to suitably select and use a material optimal for the above.
- the corrosion-resistant bonding film 24 is a bonding film having higher corrosion resistance than the high-bonding bonding film 21.
- a bonding film having high corrosion resistance under acid or alkaline conditions is selected and adopted, and the dissolution rate is higher than that of the high bonding bonding film 21 when an acidic solution or an alkaline solution is attached. Contains low material.
- the corrosion-resistant bonding film 24 of the present embodiment includes a chromium layer 22 disposed so as to be in contact with the surface of the base substrate 2, and a silicon layer 23 disposed so as to be in contact with the chromium layer 22 and the lid substrate 3. Is a two-layer structure.
- the chromium layer 22 has high adhesion to the base substrate 2 that contains chromium and is a glass-based substrate.
- the silicon layer 23 has high bondability by anodic bonding to the lid substrate 3 containing silicon and being a glass-based substrate.
- the corrosion-resistant bonding film 24 having the chromium layer 22 and the silicon layer 23 has a lower ionization tendency than the high-bonding bonding film 21 containing aluminum. Therefore, even in an environment where aluminum is easily corroded in an acid or alkaline environment, the high bondability bonding film 21 is surrounded by the corrosion-resistant bonding film 24 containing chromium and silicon, and the acid or Protected from exposure to alkaline environments.
- the combination of the high bondability bonding film 21 and the corrosion-resistant bonding film 24 can be another combination in which the magnitude relationship of the ionization tendency satisfies the above relationship.
- the corrosion-resistant bonding film 24 has a low degree of corrosion in an accelerated test or the like performed by changing the external environment to which the corrosion-resistant bonding film 24 is exposed under various conditions by paying attention to factors other than the ionization tendency. You can also select and use materials.
- the high bondability bonding film 21 and the corrosion-resistant bonding film 24 are both formed so that the thickness in the direction perpendicular to the surface of the base substrate 2 is equal. All of the corrosive bonding films 24 are in close contact with the lid substrate 3. Therefore, in the package 1, the cavity C is sealed by the high bondability bonding film 21 and the corrosion-resistant bonding film 24.
- Various circuits such as a sensor circuit and an oscillation circuit can be formed inside the cavity C, and the inside of the cavity C can be sealed in a vacuum state.
- FIGS. 2A to 5 are cross-sectional views showing a method for manufacturing the package 1
- FIG. 5 is a flowchart showing the method for manufacturing the package 1.
- the base wafer 20 (first wafer) that is the base of the base substrate 2 and the lid wafer 30 that is the base of the lid substrate 3 are bonded together, so that a plurality of packages 1 are batched. To manufacture.
- FIG. 2A and 2B are cross-sectional views showing a process of manufacturing the package 1, and show a wafer forming step S1 (see FIG. 5) for forming the base wafer 20 and the lid wafer 30 into a predetermined shape.
- FIG. 2A shows the base wafer 20.
- the base wafer 20 is formed into a shape in which a plurality of base substrates 2 are integrally formed, such as drilling and wiring (see first wafer forming step S11, FIG. 5). ).
- FIG. 2B shows the lid wafer 30.
- a recess 3a is formed at a position that becomes the cavity C after the manufacture of the package 1 is completed, and a bonding region having a predetermined width W1 is formed so as to partition the recess 3a.
- the lid wafer 30 is formed into a shape in which a plurality of lid substrates 3 are integrally formed (see the second wafer forming step S12, FIG. 5).
- 3A to 3C are cross-sectional views showing a process of manufacturing the package 1, and a bonding film forming step S2 (FIG. 5) for forming the high bondability bonding film 21 and the corrosion-resistant bonding film 24 in a predetermined shape. Reference).
- a bonding film forming step S2 for forming the high bondability bonding film 21 and the corrosion-resistant bonding film 24 in a predetermined shape. Reference).
- FIG. 3A in the bonding film forming step S2, first, on the surface of the base wafer 20, a belt having a predetermined width W1 and a predetermined thickness H is formed at a position corresponding to a bonding region of the predetermined width W1 on the lid wafer 30.
- One bonding film 21 (the above-described highly bonding film 21) is formed (first step S21, see FIG. 5).
- a sputtering method can be employed as a method for forming the first bonding film 21.
- a first bonding film 21 is formed on the surface of the first wafer 20 so as to surround a region that becomes the cavity C when the manufacturing of the package 1 is completed.
- a plurality of regions serving as cavities C are arranged on the wafer (base wafer 20, lid wafer 30), and the first bonding film 21 is formed in a lattice pattern on the base wafer 20.
- the intermediate portion in the width direction of the first bonding film 21 is removed in a strip shape having a width W ⁇ b> 2 narrower than the predetermined width W ⁇ b> 1 to remove the surface of the base wafer 20. Is formed (see removal step S22, FIG. 5).
- the groove part G1 is formed along the center line of the first bonding film 21, and divides the first bonding film 21 like the high bonding bonding films 21a and 21b.
- the width W2 of the groove G1 is preferably 1 ⁇ 2 or less with respect to the predetermined width W1 of the first bonding film 21. This is to ensure the bonding between the base substrate 2 and the lid substrate 3 by increasing the width of the highly bondable bonding film 21 after the manufacture of the package 1 is completed.
- the corrosion-resistant bonding film 24 having a lower ionization tendency than the high-bonding bonding film 21 on the surface of the base wafer 20 exposed in the groove G1 as described above. (See the second step S23, FIG. 5).
- the second step S ⁇ b> 23 first, the chromium layer 22 is laminated on the base wafer 20, and further, the silicon layer 23 is laminated on the upper surface of the chromium layer 22.
- a method (sputtering method) similar to the method for forming the first bonding film 21 can be employed.
- the formation method of the 1st joining film 21 (highly joining film
- membrane 24 is made with the same method, there exists an effect which simplifies a manufacturing process, but high joining property
- the method for forming the bonding film 21 and the method for forming the corrosion-resistant bonding film 24 may be different.
- the thickness of the corrosion resistant bonding film 24 is preferably formed to be equal to the predetermined thickness H of the high bondability bonding film 21.
- the thickness of each of the chromium layer 22 and the silicon layer 23 can be set to an appropriate thickness that gives a predetermined thickness H in total.
- FIG. 3C shows a state where all of the grooves G1 are filled with the corrosion-resistant bonding film 24, but there is a gap between the corrosion-resistant bonding film 24 and the high-bonding bonding film 21. It doesn't matter.
- FIG. 4A and 4B are cross-sectional views showing a process of manufacturing the package 1, and show a package forming step S3 (see FIG. 5) in which the base wafer 20 and the lid wafer 30 are joined and divided as a package.
- the base wafer 20 and the lid wafer 30 are overlapped so as to sandwich the first bonding film (high bonding adhesive film 21) and the corrosion-resistant bonding film 24. Joining (see joining step S31, FIG. 5).
- the bonding step S31 is performed by an anodic bonding method, and the base wafer 20 and the lid wafer 30 that are overlaid are first pressed in the compression direction. Subsequently, a predetermined DC voltage is applied so that the base wafer 20 is on the anode side and the lid wafer 30 is on the cathode side. Then, the highly bondable bonding film 21 and the silicon layer 23 are anodically bonded to the lid wafer 30, and a cavity C that is a gap is generated between the base wafer 20 and the lid wafer 30.
- the joined body in which the base wafer 20 and the lid wafer 30 are joined at the intermediate portion in the width direction of the corrosion-resistant joining film 24 is cut (dicing step S32, (See FIG. 5).
- the joined body of the base wafer 20 and the lid wafer 30 is cut so as to include one cavity C, so that a plurality of packages 1 are obtained.
- the base substrate 2 and the lid substrate 3 are reliably bonded by the high bondability bonding film 21. Further, the high bondability bonding film 21 is prevented from being exposed to the outside of the package 1 by the corrosion-resistant bonding film 24, and the exposure to the atmosphere outside the package 1, an acidic solution, or an alkaline solution is suppressed. ing. Therefore, it is possible to achieve both the bonding strength and the corrosion resistance in the package.
- the corrosion of the high bondability bonding film 21 is suppressed by the corrosion-resistant bonding film 24, aluminum that emphasizes bondability is selected for the high bondability bonding film 21 without considering the corrosion resistance. Can do. Since the material containing aluminum is used for the highly bondable bonding film 21, the base substrate 2 and the lid substrate 3 which are glass substrates can be firmly bonded, and the cavity C is reliably sealed.
- the high bondability bonding film 21 is formed first, and then the width of the high bondability bonding film 21 is increased.
- the middle part of the direction is formed so as to be replaced by the corrosion-resistant bonding film 24. Therefore, it is possible to complete the structure that prevents the corrosion of the bonding film at the stage where the base substrate 2 and the lid substrate 3 are both in a wafer shape. Therefore, the high bondability bonding film 21 has already been reliably protected by the corrosion-resistant bonding film 24 after being cut out as the package 1.
- the structure for preventing the corrosion of the bonding film at the wafer stage is completed as described above, it is not necessary to individually cover the bonding film exposed on the outer surface of the package 1 as in the prior art. As a result, the package can be manufactured efficiently.
- FIG. 6 and 7 are perspective views showing a manufacturing process in the piezoelectric vibrator manufacturing method of the present embodiment.
- FIG. 8 is a perspective view showing a partially broken piezoelectric vibrator of this embodiment.
- the piezoelectric vibrating reed 4 is arranged in a cavity C of a package similar to the package shown in FIG.
- the piezoelectric vibrator 100 oscillates at a predetermined frequency when the piezoelectric vibrating piece 4 is energized.
- FIG. 9 is a flowchart showing a method for manufacturing the piezoelectric vibrator 100. As shown in FIG. 9, in the method for manufacturing a piezoelectric vibrator of the present embodiment, a wiring process S ⁇ b> 101 and a connection process 102 are further included in the above-described package manufacturing method.
- the wiring step S ⁇ b> 101 is a step of forming the wiring circuit 10 in a region surrounded by the high bondability bonding film 21, that is, inside the cavity C.
- the wiring circuit 10 has an electrode that communicates with the outer surface of the package 1.
- the connecting step S102 is a step of electrically connecting the piezoelectric vibrating reed 4 to the wiring circuit 10 formed on the surface of the base wafer 20 in the wiring step S101.
- 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. Things can be adopted.
- a joining step S31 similar to the above is performed following the connecting step S102, and the base wafer 20 and the lid wafer 30 to which the piezoelectric vibrating reed 4 is connected are joined.
- a dicing step S32 is performed subsequent to the joining step S31, whereby the piezoelectric vibrator 100 in which the piezoelectric vibrating reed 4 is hermetically sealed is cut and completed.
- the high bondability bonding film 21 is already secured by the corrosion-resistant bonding film 24 after being separated as a piezoelectric vibrator in the same manner as the above-described package manufacturing method. Is protected. Accordingly, airtightness in the cavity is ensured, and stable operation of the piezoelectric vibrating piece disposed inside the cavity can be maintained regardless of the external environment of the piezoelectric vibrator.
- the package of the present invention maintains the airtightness of the cavity in an environment where the bonding film is easily corroded in a package in which a plurality of substrates are bonded and a cavity is formed between the plurality of substrates, and is disposed inside the cavity.
- the present invention can be preferably applied to maintain the stable operation of the actuated piece.
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Abstract
Description
また、特許文献1には、接合層としてアルミニウム、チタン、タンタル、シリコン等の金属あるいは半導体を使用することができることが記載されている。
しかしながら、特許文献1に記載のパッケージでは、外部環境、特に酸やアルカリに接触された際に接合層が腐食されることがある。例えば、接合性の高いアルミニウムを用いて接合層を構成した場合、通常は大気中においては大気に露出された接合層の表面には酸化アルミニウム(アルミナ)が皮膜状に生じるため、接合層の深部の腐食は抑制されている。ここで、大気の湿度が高い場合や、接合層が酸性の溶液に接触する環境であると、アルミニウムのイオン化傾向が高いため接合層において局部電池が生じ、接合層が深部まで容易に腐食されてしまう。接合層が腐食された際にはその隙間から大気が流入するため、パッケージの内部を所定の環境に維持することができなくなり、パッケージ製品の性能に影響を与えてしまう。
このような接合層の腐食を抑制するために、パッケージの外周に接合層を覆うコーティングを設けることが知られている。しかしながら、このようなコーティングを施すためには、コート材を塗布するために特別な工程を設ける必要がある。さらに、接合層には確実にコート材が被覆され、例えば電極等の部位にはコート材が付着されないようにするためには高い加工精度を要する。
また、耐腐食性が高いことを優先して接合層を構成すると、基板同士の接合性が不十分となる場合があり、パッケージ製品の品質の維持が困難となる場合がある。
本発明は、上述した事情に鑑みてなされたものであって、その目的は基板同士の接合性と耐腐食性とを両立できるパッケージの提供を図ることにある。
また、本発明の第2の目的は、基板同士の接合性と耐腐食性とを両立できるパッケージを効率よく製造できるパッケージの製造方法および圧電振動子の製造方法の提供を図ることにある。
この場合、耐腐食性接合膜によって高接合性接合膜の腐食が抑制されているので、高接合性接合膜は耐腐食性を考慮せずに接合性を重視したアルミニウムを選択することができる。アルミニウムはイオン化傾向が高い素材であり他種金属と接触された状態で酸性溶液等が付着すると溶解する性質を有するが、耐腐食性接合膜によってパッケージの外部環境から保護されているために腐食が抑制されている。アルミニウムが使用されることで第一基板と第二基板との接合性が高まり、キャビティの密封を確実にできる。
この場合、第一基板と第二基板とがともにガラス系基板であり、第一基板上にはクロム層が配置されている。クロム層は、ガラスとの接着性が高く、またガラス系の第一基板に容易に所望のパターンとして形成可能である。また、クロム層と第二基板との間にシリコン層を有するので、クロム層とシリコン層とは金属同士で強固に結合され、シリコン層ガラス系の第二基板とは陽極接合によって好適に接合される。
この発明によれば、第一工程において帯状の第一接合膜が形成され、その後除去工程において第一接合膜の幅方向の中間部に溝部が形成される。その後第二工程において溝部に沿って耐腐食性接合膜が形成されると、第一ウエハ上ではキャビティと接合膜との並び順が、キャビティ、第一接合膜、耐腐食性接合膜、第一接合膜の順で繰り返しになっている。その後、ダイシング工程において耐腐食性接合膜の幅方向の中間部が切断されるので、第一接合膜は耐腐食性接合膜の内方に位置し、耐腐食性接合膜によって腐食の進行が抑制できる。
この発明によれば、第一接合膜は耐腐食性接合膜の内方に位置し、耐腐食性接合膜によって腐食の進行が抑制できる。このため、キャビティ内の気密が確実になされ、圧電振動子の外部環境によらずキャビティの内部に配置された圧電振動片の安定動作を維持することができる。
また、本発明のパッケージの製造方法によれば、基板同士の接合性と耐腐食性とを両立できるパッケージを効率よく製造できる。
また、本発明の圧電振動子の製造方法によれば、基板同士の接合性と耐腐食性とを両立でき、圧電振動子の外部環境によらず圧電振動片の安定動作を維持できる圧電振動子を効率よく製造できる。
図1は、本実施形態のパッケージ1を一部破断して示す斜視図である。図1に示すように、パッケージ1は、ベース基板2(第一基板)とリッド基板3(第二基板)とを含む複数の基板が接合されており、ベース基板2とリッド基板3との間にキャビティCが形成されている。
クロム層22は、クロムを含有しガラス系基板であるベース基板2に対して接着性が高い。またシリコン層23は、シリコンを含有しガラス系基板であるリッド基板3に対して陽極接合による高い接合性を有する。
従って、パッケージ1では、キャビティCは高接合性接合膜21と耐腐食性接合膜24とによって密封されている。また、キャビティCの内部には、センサー回路や発振回路などの様々な回路を構成することができ、またキャビティCの内部が真空状態で密封された構成とすることもできる。
なお、図3Cには溝G1のすべてに耐腐食性接合膜24が充填されている様子を示しているが、耐腐食性接合膜24と高接合性接合膜21との間に隙間があっても構わない。
図8に示すように、本実施形態の圧電振動子100は、図1に示すパッケージと同様のパッケージのキャビティCに圧電振動片4が配置されている。圧電振動子100は、圧電振動片4に通電されることによって所定の周波数で発振するものである。
以下では、圧電振動子100の製造方法について詳述する。
図9は、圧電振動子100の製造方法を示すフローチャートである。図9に示すように、本実施形態の圧電振動子の製造方法では、上述のパッケージの製造方法に、配線工程S101と接続工程102とがさらに備えられている。
接続工程S102は、図7に示すように、配線工程S101においてベースウエハ20の面上に形成された配線回路10に対して、圧電振動片4を電気的に接続する工程である。圧電振動片4は、詳細は図示しないが、例えば、水晶、タンタル酸リチウムやニオブ酸リチウム等の圧電材料から形成された音叉型の振動片であり、所定の電圧が印加されたときに振動するものを採用することができる。
接合工程S31に続いてダイシング工程S32が行われることによって圧電振動片4が気密に封入された圧電振動子100が切り分けられて完成する。
2 ベース基板(第一基板)
4 圧電振動片
20 ベースウエハ(第二ウエハ)
21、21a、21b 高接合性接合膜(第一接合膜)
22 クロム層
23 シリコン層
24 耐腐食性接合膜
3 リッド基板(第二基板)
3a 凹部
30 リッドウエハ(第二ウエハ)
100 圧電振動子
C キャビティ
W1 所定幅
H 所定厚さ
S11 第一ウエハ形成工程
S12 第二ウエハ形成工程
S21 第一工程
S22 除去工程
S23 第二工程
S31 接合工程
S32 ダイシング工程
Claims (5)
- 第一基板と第二基板とを含む複数の基板が接合されて前記複数の基板の間にキャビティが形成されるパッケージであって、
前記第一基板と前記第二基板との対向する面上で前記キャビティを囲繞して配置された耐腐食性接合膜と、
前記第一基板と前記第二基板との対向する面上で前記耐腐食性接合膜の内方に配置され、前記耐腐食性接合膜よりも接合力が高い高接合性接合膜と、
を備えるパッケージ。 - 請求項1に記載のパッケージであって、前記高接合性接合膜が、アルミニウムを含有するパッケージ。
- 請求項1または2に記載のパッケージであって、
前記第一基板および前記第二基板がガラスを含有し、
前記耐腐食性接合膜が、
前記第一基板の面上に接触するように配置されたクロム層と、
前記クロム層と前記第二基板とに接触するように配置されたシリコン層と、
を有するパッケージ。 - 第一基板と第二基板とを含む複数の基板が接合されて前記複数の基板の間にキャビティが形成されるパッケージの製造方法であって、
複数の前記第一基板が一体成形された第一ウエハを成形する第一ウエハ成形工程と、
前記第一基板と重ね合わせ可能な位置関係で複数の前記第二基板が一体成形された第二ウエハを成形する第二ウエハ成形工程と、
前記第一ウエハの面上に前記キャビティを囲繞するように所定幅以上の帯状で所定厚さを有する第一接合膜を形成する第一工程と、
前記第一工程に続いて前記第一接合膜の幅方向の中間部を前記所定幅よりも狭い帯状に除去して前記第一ウエハの面が露出された溝部を形成する除去工程と、
前記除去工程に続いて前記溝部に露出された前記第一ウエハの面上に前記第一接合膜よりもイオン化傾向が低く、前記所定厚さを有する耐腐食性接合膜を形成する第二工程と、
前記第一接合膜および前記耐腐食性接合膜を挟むように前記第一ウエハと前記第二ウエハとを重ね合わせて接合する接合工程と、
前記接合工程に続いて前記耐腐食性接合膜の幅方向の中間部において前記第一ウエハと前記第二ウエハとが接合された接合体を切断するダイシング工程と、
を備えるパッケージの製造方法。 - 第一基板と第二基板とを含む複数の基板が接合されて前記複数の基板の間にキャビティが形成される圧電振動子の製造方法であって、
複数の前記第一基板が一体成形された第一ウエハを成形する第一ウエハ成形工程と、
前記第一基板と重ね合わせ可能な位置関係で複数の前記第二基板が一体成形された第二ウエハを成形する第二ウエハ成形工程と、
前記第一ウエハの面上に前記第一基板における所定の回路形状を有する配線を複数形成する配線工程と、
前記第一ウエハの面上に前記キャビティを囲繞するように所定幅以上の帯状で所定厚さを有する第一接合膜を形成する第一工程と、
前記第一工程に続いて前記第一接合膜の幅方向の中間部を前記所定幅よりも狭い帯状に除去して前記第一ウエハの面が露出された溝部を形成する除去工程と、
前記除去工程に続いて前記溝部に露出された前記第一ウエハの面上に前記第一接合膜よりもイオン化傾向が低く、前記所定厚さを有する耐腐食性接合膜を形成する第二工程と、
前記第二工程の後に前記配線に圧電振動片を接続する接続工程と、
前記第一接合膜および前記耐腐食性接合膜を挟むように前記第一ウエハと前記第二ウエハとを重ね合わせて接合する接合工程と、
前記接合工程に続いて前記耐腐食性接合膜の幅方向の中間部において前記第一ウエハと前記第二ウエハとが接合された接合体を切断するダイシング工程と、
を備える圧電振動子の製造方法。
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JP2011501391A JP5204891B2 (ja) | 2009-02-25 | 2009-02-25 | パッケージ、パッケージの製造方法、および圧電振動子の製造方法 |
CN200980157655.7A CN102334287B (zh) | 2009-02-25 | 2009-02-25 | 封装件、封装件的制造方法以及压电振动器的制造方法 |
PCT/JP2009/053338 WO2010097909A1 (ja) | 2009-02-25 | 2009-02-25 | パッケージ、パッケージの製造方法、および圧電振動子の製造方法 |
TW098144506A TW201041196A (en) | 2009-02-25 | 2009-12-23 | Package, package manufacturing method and piezoelectric vibrator manufacturing method |
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JP2000286671A (ja) * | 1999-01-29 | 2000-10-13 | Seiko Instruments Inc | 圧電振動子 |
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