JP2004142136A - Ultrasonic welding method for resin package - Google Patents
Ultrasonic welding method for resin package Download PDFInfo
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- JP2004142136A JP2004142136A JP2002306882A JP2002306882A JP2004142136A JP 2004142136 A JP2004142136 A JP 2004142136A JP 2002306882 A JP2002306882 A JP 2002306882A JP 2002306882 A JP2002306882 A JP 2002306882A JP 2004142136 A JP2004142136 A JP 2004142136A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
- B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
- B29C65/7814—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of inter-cooperating positioning features, e.g. tenons and mortises
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
- B29C65/081—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations having a component of vibration not perpendicular to the welding surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
- B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
- B29C65/7808—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7855—Provisory fixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/114—Single butt joints
- B29C66/1142—Single butt to butt joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
- B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
- B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
- B29C66/322—Providing cavities in the joined article to collect the burr
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
- B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
- B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
- B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
【0001】
【発明の属する技術分野】
本発明は電子部品などの樹脂パッケージの超音波溶着方法に関するものである。
【0002】
【従来の技術】
【特許文献1】特開平4−102388号公報
【特許文献2】特開平11−328910号公報
従来、電子部品を樹脂パッケージ内に封入する場合、樹脂パッケージを封止する方法として超音波溶着方法が用いられる。
特許文献1には、電子部品素子をプリント基板に超音波溶着する方法が開示されている。すなわち、電子部品素子の底部に設けられた円柱状凸部と、プリント基板側に設けられた凹部とで位置決めし、超音波振動を与えることで、電子部品素子をプリント基板上に溶着させるとともに、電子部品素子の端子部をプリント基板に電気的に導通させたものである。
特許文献2には、ディスクカートリッジの上ケースと下ケースとを溶着するに際し、一方のケースの周壁近傍に挿入突起を設け、他方のケースの周壁近傍に挿入突起を挿入するための穴が設けられた受け突起を設け、両者を嵌合させた状態で、両ケースの突き合わせ面の何れかに設けた複数の突起を超音波溶着することで上下ケースを連結するものが開示されている。
【0003】
【発明が解決しようとする課題】
ところが、いずれの溶着方法でも、使用される超音波の振動方向は縦方向、つまり位置決め用の凸部または突起の挿入方向に超音波振動が加えられる。このような縦振動による溶着方法では、接合部材(ケースなど)に加わる超音波振動によるダメージが大きく、薄肉なケースの溶着や、内部にデリケートな素子が収納されるケースの溶着には適さなかった。
【0004】
一方、超音波の振動方向を横方向とすることも考えられる。横振動溶着方法では、気密溶着性が良好であるとともに、接合部材に与えるダメージが小さく、特に薄肉の接合部材の溶着に有効である。しかしながら、横振動のため、接合部材間に横方向のクリアランスが数十〜数百μm程度必要となる。
このように振動方向にクリアランスを必要とするため、接合部材同士が位置決めされておらず、超音波溶着前の搬送途中の振動や衝撃により、脱落や位置ずれが発生する。その結果、接合部材同士がずれた状態で溶着されることが多く、高品質なパッケージが得られないという欠点があった。
【0005】
そこで、本発明の目的は、超音波溶着を行う場合に、高精度の位置決めを行いつつ、パッケージに対するダメージが少ない樹脂パッケージの超音波溶着方法を提供することにある。
【0006】
【課題を解決するための手段】
上記目的を達成するため、請求項1に係る発明は、樹脂製の第1パッケージ部品と第2パッケージ部品との接合面を超音波溶着して樹脂パッケージを構成する方法において、上記第1パッケージ部品の接合面に超音波振動により折損し得る少なくとも2本の位置決めピンが一体に形成され、上記第2パッケージ部品の接合面に上記位置決めピンが嵌合される位置決め穴が形成されており、上記位置決めピンを位置決め穴に嵌合させ、第1パッケージ部品と第2パッケージ部品とを対向方向に加圧しつつ、上記接合面に対してほぼ平行な方向でかつ位置決めピンと位置決め穴との嵌合隙間より大きな振幅の超音波振動を与えることにより、上記位置決めピンを折るとともに、接合面を溶着することを特徴とする樹脂パッケージの超音波溶着方法を提供する。
【0007】
本発明では、超音波振動の印加開始時点で第1パッケージ部品と第2パッケージ部品との位置決めができておればよい点に着目し、位置決めピンと位置決め穴との嵌合により高精度に位置決めした後、横方向の超音波振動を加えることにより、位置決めピンをわざと折損させる。そのため、超音波振動を阻害することなく溶着でき、高精度の位置決めを行いつつ、パッケージやその中に収納される部品に対するダメージが少ない溶着を実現することができる。
位置決めピンを少なくとも2本設けたのは、X,Y,θ方向の位置決めを確実に行うためである。
超音波振動の振幅は、位置決めピンが確実に折損できる振幅とする必要がある。そのため、超音波振動の振幅は、位置決めピンと位置決め穴の横方向(接合面と平行な方向)の嵌合隙間より大きくする必要がある。例えば、位置決めピンを位置決め穴に圧入した場合、嵌合隙間が0となるので、超音波振動の振幅が40μm以上であれば、位置決めピンを簡単に折ることができる。
位置決めピンは、搬送時などの振動や衝撃では折損せず、超音波振動(横振動)によって容易に折損できる程度の強度あるいは太さを持つものがよい。
【0008】
請求項2のように、第1パッケージ部品および第2パッケージ部品の一方の接合面に、位置決めピンより低い超音波溶着用の小突起を、接合面のほぼ全周に連続的に形成し、小突起を超音波溶着することにより、第1パッケージ部品と第2パッケージ部品の接合面を封止するのがよい。
すなわち、超音波溶着を用いてパッケージを封止する場合に、超音波振動を集中させるための小突起を接合面に設けるが、この小突起を位置決めピンより低くすることで、位置決めピンによって位置決めした状態で超音波溶着を開始することができる。超音波溶着を終了すれば、小突起が溶融して第1パッケージ部品と第2パッケージ部品の接合面を封止し、封止構造の樹脂パッケージを得ることができる。
【0009】
請求項3のように、第1パッケージ部品および第2パッケージ部品の一方の接合面に、超音波溶着時の溢出樹脂を吸収するための溝部を設けるのがよい。
すなわち、超音波溶着時に、溶融した樹脂の一部が接合面から外部へ溢れ出て外観を損なうことがある。そこで、溢出樹脂を吸収するための溝部を一方のパッケージ部品の接合面に形成することで、この溝部に樹脂が溜まり、外部に溢れ出ることがない。
【0010】
本発明の樹脂パッケージは、必ずしも封止される必要はなく、少なくとも第1パッケージ部品と第2パッケージ部品とが正確に位置決めされかつ確実に溶着固定されるものであればよい。
樹脂パッケージの内部には、電子部品のような固体物のほか、流動体を封入することもできる。
【0011】
【発明の実施の形態】
図1〜図3は本発明を電子部品の樹脂パッケージに適用した例を示し、図1はその外観図、図2はその分解図、図3は組立時の工程図である。
図において、1は第1パッケージ部品であるケース、10は第2パッケージ部品であるカバーであり、両部品はLCP,PPS,PS,PETなどの超音波溶着可能な樹脂材料でそれぞれ一体成形されている。ケース1およびカバー10は同一材料で形成するのがよい。
【0012】
ケース1には、電子部品素子(図示せず)を収納するための凹部2と、この凹部2を取り囲む周壁3とが設けられ、周壁3の頂面には連続した接合面4が設けられている。ケース1の周壁3の一部には、厚肉な端子台部3aが設けられ、この端子台部3aに複数の端子6がインサート成形にて固定されている。ケースの接合面4上、特に端子台部3aの上には2本の位置決めピン5が突設されている。これら位置決めピン5は、ケース1を構成する樹脂材料で一体成形されており、後述する超音波振動によって容易に折損できる太さに形成されている。ここでは、ケース1とカバー10とを嵌合させた状態で搬送した時の振動や衝撃では折損せず、超音波振動が加わった時には容易に折損できるように、円柱状ピンとしたが、断面が多角形状のピンでもよい。
【0013】
カバー10は、ケース1の凹部2と対向する浅い凹部11と、この凹部11を取り囲む周壁12とが設けられている。周壁12の頂面にはケース4の接合面4と対面する接合面13が形成されている。接合面13には、上記位置決めピン5が圧入嵌合される2個の位置決め穴14が設けられている。位置決めピン5と位置決め穴14とは圧入嵌合されるので、その横方向の嵌合隙間は0である。この実施例では、ピン径をφ0.37mm、穴径をφ0.34mmとした。位置決め穴14を除く接合面13上のほぼ全周に、超音波溶着用の断面三角形状の小突起15が連続的に形成され、接合面13の外周縁全周には、超音波溶着時の溢出樹脂を吸収するための溝16が形成されている。小突起15の突出高さhは、位置決めピン5の突出高さHより低い。すなわち、h<Hに設定されている。
なお、ここでは、溢出樹脂吸収溝16をカバー10に設けたが、ケース1に設けてもよいことは勿論である。また、吸収溝16の位置は接合面13の外周縁に限らず、内周縁でもよい。
【0014】
ここで、上記ケース1とカバー10との接合方法について、図3を参照して説明する。
(a)は、ケース1上にカバー10を対向させた状態を示す。
(b)は、ケース1の位置決めピン5をカバー10の位置決め穴14に圧入し、小突起15をケース1の接合面4上に圧接させた状態を示す。位置決めピン5は小突起15より長いので、位置決めピン5は位置決め穴14に確実に圧入嵌合される。この状態で、ケース1とカバー10は超音波印加装置の位置まで搬送されるが、位置決めピン5と位置決め穴14との圧入嵌合によってケース1とカバー10とがX,Y,θ方向に固定されているので、位置ずれや脱落を確実に防止できる。
(c)は超音波振動の印加直後を示す。すなわち、(b)のように位置決めピン5を位置決め穴14に圧入嵌合した状態で、ケース1を図示しない保持装置によって保持し、カバー10を図示しない超音波印加装置(ホーン)によってすべりが生じないように保持する。そして、超音波印加装置によってカバー10をケース1に向かって加圧しつつ、横方向の超音波振動、つまり接合面4,13に対してほぼ平行な方向の超音波振動を与える。この実施例における超音波振動の条件は、次の通りである。
超音波振幅:80μm
超音波周波数:20kHz
ホーン下降スピード:60mm/s
超音波振動の振幅は位置決めピン5と位置決め穴14との嵌合隙間(ほぼ0である)より大きいので、超音波振動が位置決めピン5に対して直角方向に作用し、位置決めピン5はその根元付近で折れる。5aは位置決めピン5の破断面である。しかし、ケース1とカバー10との位置関係は、ケース保持装置と超音波印加装置とによって保持されているので、超音波振動の印加中にケース1とカバー10とが超音波振幅以上の位置ずれを起こすことはない。位置決めピン5が折れた後も超音波振動を印加し続けることにより、接合面4と圧接している小突起15が溶融し、接合面4,13の隙間を満たす。なお、位置決めピン5の破断面5aが溶融する場合もある。
(d)は超音波溶着後の状態を示す。すなわち、超音波溶着時に、溶融した樹脂17の一部が接合面4,13から外部へ溢れ出ようとするが、カバー10の接合面13の外周縁に溢出樹脂を吸収するための溝16が形成されているので、溶融樹脂17は溝16に溜まり、外部に溢れ出ることがない。溶融樹脂17は接合面4,13の全周を満たすので、ケース1とカバー10との間が完全に気密封止される。
【0015】
上記のように、超音波振動の方向が横方向であるため、気密溶着性が良好であるとともに、ケース1、カバー10さらにはケース1内に収納される内蔵部品に与えるダメージが小さく、特に薄肉のケース1とカバー10との溶着に有効である。また、位置決めピン5と位置決め穴14との嵌合によって、超音波溶着前のケース1とカバー10との位置決めができているので、溶着後のケース1とカバー10との位置ずれも、超音波振動の振幅の範囲内に収めることができ、外観および寸法精度のよいパッケージを得ることができる。また、位置決めピン5は超音波振動によって簡単に折れるので、超音波振動を阻害することなく、溶着に不都合はない。
【0016】
上記実施例では、位置決めピンをケース側に、超音波溶着用の小突起をカバー側に設けたが、位置決めピンおよび小突起を共にケースあるいはカバーの一方側にのみ設けてもよい。
本発明のパッケージ構造は、超音波振動が横振動であるため、縦振動に比べて衝撃荷重が大幅に低減される。そのため、内部に収納される部品が、圧電素子や精密素子、バンプ接合された素子、ワイヤボンディングされた素子のようなデリケートな部品である場合に好適である。
【0017】
【発明の効果】
以上の説明で明らかなように、本発明によれば、第1パッケージ部品と第2パッケージ部品とを位置決めピンと位置決め穴との嵌合により高精度に位置決めした後、横方向の超音波振動を加えることにより、位置決めピンを折損させ、接合面同士を超音波溶着している。そのため、高精度の位置決めを行いつつ、パッケージやその中に収納される部品に対するダメージが少ない溶着を実現することができる。
【図面の簡単な説明】
【図1】本発明にかかる超音波溶着方法により溶着したパッケージを持つ電子部品の斜視図である。
【図2】図1に示すケースとカバーとの分解斜視図である。
【図3】図1に示すケースとカバーの超音波溶着を示す工程図である。
【符号の説明】
1 ケース(第1パッケージ部品)
4 接合面
5 位置決めピン
10 カバー(第2パッケージ部品)
13 接合面
14 位置決め穴
15 超音波溶着用小突起
16 溢出樹脂吸収溝[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for ultrasonically welding a resin package such as an electronic component.
[0002]
[Prior art]
[Patent Document 1] Japanese Unexamined Patent Application Publication No. 4-102388 [Patent Document 2] Japanese Unexamined Patent Application Publication No. 11-328910 Conventionally, when an electronic component is sealed in a resin package, an ultrasonic welding method is used as a method for sealing the resin package. Used.
[0003]
[Problems to be solved by the invention]
However, in any of the welding methods, the vibration direction of the ultrasonic wave used is vertical, that is, the ultrasonic vibration is applied in the insertion direction of the positioning protrusion or projection. Such a method of welding by longitudinal vibration is not suitable for welding of a thin case or welding of a case in which a delicate element is housed inside, because the ultrasonic vibration applied to the joining member (a case or the like) causes a large damage. .
[0004]
On the other hand, it is also conceivable to make the vibration direction of the ultrasonic waves horizontal. The transverse vibration welding method has good hermetic weldability and less damage to the joining members, and is particularly effective for welding thin joining members. However, due to the lateral vibration, a lateral clearance of about several tens to several hundreds μm is required between the joining members.
Since the clearance is required in the vibration direction as described above, the bonding members are not positioned with each other, and dropping or displacement occurs due to vibration or impact during conveyance before ultrasonic welding. As a result, the joining members are often welded in a state of being shifted from each other, and there is a disadvantage that a high-quality package cannot be obtained.
[0005]
Accordingly, an object of the present invention is to provide a method of ultrasonically welding a resin package that performs high-accuracy positioning and causes less damage to the package when performing ultrasonic welding.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a method of forming a resin package by ultrasonically welding a joining surface between a first package component and a second package component made of resin. At least two positioning pins that can be broken by ultrasonic vibration are integrally formed on the joining surface of the second package component, and a positioning hole in which the positioning pin is fitted is formed on the joining surface of the second package component. The pin is fitted into the positioning hole, and the first package component and the second package component are pressed in the opposite direction while being substantially parallel to the joint surface and larger than the fitting gap between the positioning pin and the positioning hole. A method for ultrasonically welding a resin package, wherein the positioning pin is broken and the joint surface is welded by applying ultrasonic vibration of amplitude. To provide.
[0007]
The present invention focuses on the point that the first package component and the second package component need only be positioned at the start of the application of the ultrasonic vibration, and after positioning with high accuracy by fitting the positioning pins and the positioning holes. By applying ultrasonic vibration in the lateral direction, the positioning pin is intentionally broken. Therefore, the welding can be performed without disturbing the ultrasonic vibration, and the welding can be realized with less damage to the package and the components housed therein while performing the positioning with high accuracy.
The reason why at least two positioning pins are provided is to surely perform positioning in the X, Y, and θ directions.
The amplitude of the ultrasonic vibration needs to be an amplitude at which the positioning pin can be reliably broken. Therefore, the amplitude of the ultrasonic vibration needs to be larger than the fitting gap in the lateral direction (the direction parallel to the joining surface) between the positioning pin and the positioning hole. For example, when the positioning pin is press-fitted into the positioning hole, the fitting gap becomes zero, so that if the amplitude of the ultrasonic vibration is 40 μm or more, the positioning pin can be easily broken.
It is preferable that the positioning pin has a strength or thickness that does not break due to vibration or impact during transportation or the like but can be broken easily by ultrasonic vibration (lateral vibration).
[0008]
As described in
That is, when the package is sealed using ultrasonic welding, a small projection for concentrating the ultrasonic vibration is provided on the joining surface, but by positioning the small projection lower than the positioning pin, the positioning is performed by the positioning pin. Ultrasonic welding can be started in the state. When the ultrasonic welding is completed, the small projections are melted to seal the joint surface between the first package component and the second package component, and a resin package having a sealed structure can be obtained.
[0009]
According to a third aspect of the present invention, it is preferable that a groove is formed on one of the joining surfaces of the first package component and the second package component for absorbing the overflow resin during ultrasonic welding.
That is, at the time of ultrasonic welding, a part of the melted resin may overflow from the joint surface to the outside and impair the appearance. Therefore, by forming a groove for absorbing the overflowing resin on the joint surface of one of the package components, the resin accumulates in the groove and does not overflow to the outside.
[0010]
The resin package of the present invention does not necessarily need to be sealed, and it is sufficient that at least the first package component and the second package component are accurately positioned and securely fixed by welding.
In addition to solid objects such as electronic components, a fluid can be sealed inside the resin package.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 show an example in which the present invention is applied to a resin package of an electronic component. FIG. 1 is an external view of the same, FIG. 2 is an exploded view thereof, and FIG.
In the drawing,
[0012]
The
[0013]
The
Here, the overflow
[0014]
Here, a method of joining the
(A) shows a state in which the
2B shows a state in which the positioning pins 5 of the
(C) shows the state immediately after the application of the ultrasonic vibration. That is, in a state where the
Ultrasonic amplitude: 80 μm
Ultrasonic frequency: 20kHz
Horn descending speed: 60mm / s
Since the amplitude of the ultrasonic vibration is larger than the fitting gap (substantially 0) between the
(D) shows the state after ultrasonic welding. That is, at the time of ultrasonic welding, a part of the melted
[0015]
As described above, since the direction of the ultrasonic vibration is the horizontal direction, the hermetic welding property is good, and the damage to the
[0016]
In the above embodiment, the positioning pin is provided on the case side and the small projection for ultrasonic welding is provided on the cover side. However, both the positioning pin and the small projection may be provided only on one side of the case or the cover.
In the package structure of the present invention, since the ultrasonic vibration is the transverse vibration, the impact load is significantly reduced as compared with the longitudinal vibration. Therefore, it is suitable when the components housed inside are delicate components such as piezoelectric elements, precision elements, bump-bonded elements, and wire-bonded elements.
[0017]
【The invention's effect】
As is apparent from the above description, according to the present invention, after the first package component and the second package component are positioned with high precision by fitting the positioning pins and the positioning holes, a transverse ultrasonic vibration is applied. As a result, the positioning pins are broken, and the joining surfaces are ultrasonically welded to each other. Therefore, it is possible to achieve welding with less damage to the package and the components housed therein while performing highly accurate positioning.
[Brief description of the drawings]
FIG. 1 is a perspective view of an electronic component having a package welded by an ultrasonic welding method according to the present invention.
FIG. 2 is an exploded perspective view of a case and a cover shown in FIG.
FIG. 3 is a process diagram showing ultrasonic welding of the case and the cover shown in FIG. 1;
[Explanation of symbols]
1 case (first package component)
4 Joining
13 joining
Claims (3)
上記第1パッケージ部品の接合面に超音波振動により折損し得る少なくとも2本の位置決めピンが一体に形成され、
上記第2パッケージ部品の接合面に上記位置決めピンが嵌合される位置決め穴が形成されており、
上記位置決めピンを位置決め穴に嵌合させ、第1パッケージ部品と第2パッケージ部品とを対向方向に加圧しつつ、上記接合面に対してほぼ平行な方向でかつ位置決めピンと位置決め穴との嵌合隙間より大きな振幅の超音波振動を与えることにより、上記位置決めピンを折るとともに、接合面を溶着することを特徴とする樹脂パッケージの超音波溶着方法。A method of forming a resin package by ultrasonically welding a joining surface between a first package component and a second package component made of resin,
At least two positioning pins that can be broken by ultrasonic vibration are integrally formed on the joint surface of the first package component,
A positioning hole into which the positioning pin is fitted is formed on a joint surface of the second package component;
The positioning pin is fitted in the positioning hole, and the first package component and the second package component are pressed in the opposite direction, while being fitted in a direction substantially parallel to the joint surface and between the positioning pin and the positioning hole. An ultrasonic welding method for a resin package, wherein the positioning pin is broken and a bonding surface is welded by applying an ultrasonic vibration having a larger amplitude.
上記小突起を超音波溶着することにより、第1パッケージ部品と第2パッケージ部品の接合面を封止することを特徴とする請求項1に記載の樹脂パッケージの超音波溶着方法。Small projections for ultrasonic welding, which are lower than the positioning pins, are formed continuously on one of the joining surfaces of the first package component and the second package component over substantially the entire periphery of the joining surface.
The ultrasonic welding method for a resin package according to claim 1, wherein the small projections are ultrasonically welded to seal a joint surface between the first package component and the second package component.
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