JP2011222813A - Wire bonding method - Google Patents

Wire bonding method Download PDF

Info

Publication number
JP2011222813A
JP2011222813A JP2010091411A JP2010091411A JP2011222813A JP 2011222813 A JP2011222813 A JP 2011222813A JP 2010091411 A JP2010091411 A JP 2010091411A JP 2010091411 A JP2010091411 A JP 2010091411A JP 2011222813 A JP2011222813 A JP 2011222813A
Authority
JP
Japan
Prior art keywords
wire
capillary
hole
preball
joined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2010091411A
Other languages
Japanese (ja)
Other versions
JP5359977B2 (en
Inventor
Kenichiro Terui
賢一郎 照井
Shoki Asai
昭喜 浅井
Hiroshi Kasugai
浩 春日井
Yuichi Ikuno
佑一 幾野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Priority to JP2010091411A priority Critical patent/JP5359977B2/en
Publication of JP2011222813A publication Critical patent/JP2011222813A/en
Application granted granted Critical
Publication of JP5359977B2 publication Critical patent/JP5359977B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/74Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies
    • H01L24/78Apparatus for connecting with wire connectors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805Shape
    • H01L2224/4809Loop shape
    • H01L2224/48091Arched
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/484Connecting portions
    • H01L2224/48463Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond
    • H01L2224/48465Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/74Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
    • H01L2224/78Apparatus for connecting with wire connectors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/74Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
    • H01L2224/78Apparatus for connecting with wire connectors
    • H01L2224/7825Means for applying energy, e.g. heating means
    • H01L2224/783Means for applying energy, e.g. heating means by means of pressure
    • H01L2224/78301Capillary
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/80Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/85Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/80Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/85Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
    • H01L2224/8512Aligning
    • H01L2224/85148Aligning involving movement of a part of the bonding apparatus
    • H01L2224/85169Aligning involving movement of a part of the bonding apparatus being the upper part of the bonding apparatus, i.e. bonding head, e.g. capillary or wedge
    • H01L2224/8518Translational movements
    • H01L2224/85181Translational movements connecting first on the semiconductor or solid-state body, i.e. on-chip, regular stitch
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/80Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/85Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
    • H01L2224/852Applying energy for connecting
    • H01L2224/85201Compression bonding
    • H01L2224/85205Ultrasonic bonding
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01Chemical elements
    • H01L2924/01005Boron [B]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01Chemical elements
    • H01L2924/01006Carbon [C]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01Chemical elements
    • H01L2924/01029Copper [Cu]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01Chemical elements
    • H01L2924/01033Arsenic [As]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01Chemical elements
    • H01L2924/01079Gold [Au]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01Chemical elements
    • H01L2924/01082Lead [Pb]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/151Die mounting substrate
    • H01L2924/156Material
    • H01L2924/15786Material with a principal constituent of the material being a non metallic, non metalloid inorganic material
    • H01L2924/15787Ceramics, e.g. crystalline carbides, nitrides or oxides

Abstract

PROBLEM TO BE SOLVED: To provide a wire bonding method using pre-ball bonding which enables the control of wire cutting timing for cutting of a hole portion of a pre-ball while maintaining flatness of the cut surface of the hole portion as much as possible when the hole portion of the pre-ball is cut and a wire is joined onto the cut surface of the hole portion by secondary bonding.SOLUTION: A pre-ball 30 is formed. A hole portion 32 of the pre-ball 30 is cut from one end side to the other end side in a radial direction by a capillary 40 so that a joint portion 34 which is not cut out and thus is joined to a wire 20 is left at the other side. Then, the joint portion 34 is bent so as to extend in a horizontal direction. Further, the wire 20 joined to the joint portion 34 is bonded adjacent to the pre-ball 30 and then the wire 20 is cut.

Description

本発明は、プレボールを形成した後、そのプレボール上にワイヤを2次ボンディングするプレボールボンディングを用いたワイヤボンディング方法に関する。   The present invention relates to a wire bonding method using preball bonding in which a preball is formed and then a wire is secondarily bonded onto the preball.

一般に、ワイヤボンディングは、ワイヤが通る内孔を有し且つ当該内孔は先端部にて開口する開口部を有するキャピラリを用い、キャピラリの先端部から突出するワイヤの突出部を、被接合部材の一面に押し付けることにより、被接合部材の一面にワイヤを接合するものとして、行われる。   In general, in wire bonding, a capillary having an inner hole through which a wire passes and an opening that opens at the tip is used, and the protruding portion of the wire protruding from the tip of the capillary is connected to the member to be joined. This is performed by bonding the wire to one surface of the member to be bonded by pressing it onto one surface.

このようなワイヤボンディングにおいて、従来より、プレボールボンディングを用いたワイヤボンディング方法として、たとえば、特許文献1に記載のものが提案されている。このワイヤボンディング方法は、具体的には、以下のようなものである。   In such wire bonding, a wire bonding method using pre-ball bonding has been proposed, for example, as described in Patent Document 1. Specifically, this wire bonding method is as follows.

まず、キャピラリの先端部から突出するワイヤの突出部を、ボール形状のイニシャルボールとする。そして、これを被接合部材の一面上に位置させ、キャピラリを被接合部材に向けて下降することによって、イニシャルボールを被接合部材の一面に押し付ける。それとともに、キャピラリの先端部における開口部の周囲部で、イニシャルボールを押しつぶすことにより、押しつぶされたイニシャルボールとして、被接合部材の一面に接合されたプレボールを形成する。   First, the protruding portion of the wire protruding from the tip of the capillary is a ball-shaped initial ball. Then, this is positioned on one surface of the member to be bonded, and the capillary is lowered toward the member to be bonded, whereby the initial ball is pressed against one surface of the member to be bonded. At the same time, by crushing the initial ball around the opening at the tip of the capillary, a preball bonded to one surface of the member to be bonded is formed as a crushed initial ball.

図3は、この被接合部材10の一面に接合されたプレボール30を示す図である。プレボール30は、被接合部材10の一面にステッチボンディングで接合された後、ワイヤカットすることで形成される。   FIG. 3 is a diagram showing the preball 30 bonded to one surface of the member to be bonded 10. The preball 30 is formed by wire-cutting after being bonded to one surface of the bonded member 10 by stitch bonding.

そして、図3の矢印に示されるように、このプレボール30の上に、ワイヤを接合する2次ボンディング工程を行う。この場合、2次ボンディングでは、ワイヤを、プレボールの傾斜面上にボンディングすることになり、ワイヤの接合性が悪くなる。   Then, as shown by the arrow in FIG. 3, a secondary bonding process for bonding a wire is performed on the preball 30. In this case, in the secondary bonding, the wire is bonded onto the inclined surface of the preball, and the bondability of the wire is deteriorated.

この問題に対して、プレボールに平坦面を形成し、そこに2次ボンディングにて、ワイヤを接合する方法が、特許文献2に提案されている。この特許文献2の方法について、図4を参照して述べる。   In order to solve this problem, Patent Document 2 proposes a method in which a flat surface is formed on a preball and a wire is joined thereto by secondary bonding. The method of Patent Document 2 will be described with reference to FIG.

このものでは、図4(a)に示されるように、被接合部材10の一面に接合されたプレボール30が、被接合部材10の一面側から開口部42よりも径の大きな基部31と、基部31の上に位置するホール部32とを有するものであることに着目している。ここで、ホール部32は、イニシャルボールの押しつぶしのときにイニシャルボールの一部が内孔41に入り込むことにより形成されたワイヤ20よりも径が大きいものである。   In this case, as shown in FIG. 4A, the preball 30 joined to one surface of the member to be joined 10 includes a base 31 having a diameter larger than the opening 42 from one surface of the member to be joined 10, and a base Note that it has a hole portion 32 located above 31. Here, the hole portion 32 is larger in diameter than the wire 20 formed by part of the initial ball entering the inner hole 41 when the initial ball is crushed.

そして、図4(b)に示されるように、プレボール30のうちホール部32の範囲の高さにキャピラリ40の先端部43が位置するように、キャピラリ40を上昇させ、その後、図4(c)に示されるように、キャピラリ40を水平方向に移動させる。これにより、キャピラリ40の先端部43における開口部42の縁部で、ホール部32をその径方向の一端から他端側に向かって切断して平坦な切断面33を形成する。   Then, as shown in FIG. 4B, the capillary 40 is raised so that the tip end portion 43 of the capillary 40 is positioned at a height in the range of the hole portion 32 of the pre-ball 30, and thereafter, FIG. ), The capillary 40 is moved in the horizontal direction. As a result, the hole 32 is cut from one end in the radial direction toward the other end at the edge of the opening 42 at the tip 43 of the capillary 40 to form a flat cut surface 33.

このように、ワイヤの径よりも大きな径のホール部を水平方向に切断すれば、その切断面が、ワイヤの断面積よりも大きな平坦面となり、2次ボンディングの際のワイヤの接合性に優れるとされている。   Thus, if a hole having a diameter larger than the diameter of the wire is cut in the horizontal direction, the cut surface becomes a flat surface larger than the cross-sectional area of the wire, and the bondability of the wire during secondary bonding is excellent. It is said that.

特許第3709714号公報Japanese Patent No. 3709714 特開平5−6893号公報JP-A-5-6893

しかしながら、本発明者が、上記特許文献2に記載のようなホール部を切断して、その切断面に2次ボンディングを行う方法について、検討したところ、次のような問題が生じることが分かった。   However, when the present inventor examined a method of cutting the hole portion as described in Patent Document 2 and performing secondary bonding on the cut surface, it was found that the following problems occur. .

まず、プレボールのホール部は、ワイヤの径よりも径が大きいため、ワイヤカットを行うときのストレスが大きい。そのため、ワイヤカット後において、上記図4(d)に示されるように、当該切断面33よりも上方に突出するテール残りTが発生する可能性がある。   First, since the diameter of the hole portion of the preball is larger than the diameter of the wire, the stress during wire cutting is large. For this reason, after the wire cut, there is a possibility that a tail residue T protruding upward from the cut surface 33 may occur as shown in FIG.

これは、ワイヤカットは、図4(c)の状態から、キャピラリ40を上昇させてワイヤ20を引きちぎるように行うものであるためである。そして、このようなテール残りTが存在すれば、当該切断面33の平坦性が損なわれ、2次ボンディングが困難になることは明らかである。   This is because the wire cutting is performed so as to raise the capillary 40 and tear the wire 20 from the state of FIG. If such tail remaining T is present, it is clear that the flatness of the cut surface 33 is impaired and secondary bonding becomes difficult.

また、上記特許文献2に記載の方法では、ワイヤブレークという問題も生じる可能性がある。このワイヤブレークは、次のような問題である。一般に、ワイヤはリールから引き出されてキャピラリの内孔に通され、キャピラリの先端部から引き出されるが、このとき、エアーなどにより、ワイヤには、常にワイヤがキャピラリの先端部とは反対側の端部に向かうように、つまり上記リール側に戻されるように力が加わっている。   In addition, the method described in Patent Document 2 may cause a problem of wire break. This wire break is a problem as follows. In general, the wire is pulled out from the reel, passed through the inner hole of the capillary, and pulled out from the tip of the capillary. At this time, the wire is always connected to the end opposite to the tip of the capillary by air or the like. A force is applied so as to go to the part, that is, to return to the reel side.

そのため、キャピラリと上記リールとの間にクランプを設け、これでワイヤを固定することで、ワイヤがリール側に戻されてキャピラリから抜けないようにしている。   Therefore, a clamp is provided between the capillary and the reel, and the wire is fixed by this, so that the wire is returned to the reel side so as not to come out of the capillary.

ただし、キャピラリの先端部から突出するワイヤ部分にイニシャルボールが形成されていたり、当該ワイヤ部分が被接合部材の一面に接合されていたりするときは、ワイヤはキャピラリから抜けることが無いので、上記クランプは開放され、ワイヤの固定はなされない。また、被接合部材と接合されている状態のワイヤを、2次ボンディングのためにキャピラリの先端部から引き出すときも、上記クランプによるワイヤの固定はなされない。   However, when the initial ball is formed on the wire portion protruding from the tip of the capillary, or when the wire portion is joined to one surface of the member to be joined, the wire does not come out of the capillary, so the clamp Is opened and the wire is not fixed. Further, when the wire in a state of being bonded to the member to be bonded is pulled out from the tip of the capillary for secondary bonding, the wire is not fixed by the clamp.

そして、上記特許文献2に記載の方法において、プレボール30のホール部32の切断時にキャピラリ40を水平方向に動かすときには、ワイヤ20が被接合部材10の一面に接合された状態であるとともに、次の2次ボンディングのためのワイヤ20の引き出しを行うために、上記クランプによるワイヤ20の固定を行わない状態で当該切断を行う必要がある。   And in the method of the said patent document 2, when moving the capillary 40 to a horizontal direction at the time of the cutting | disconnection of the hole part 32 of the preball 30, while the wire 20 is the state joined to one surface of the to-be-joined member 10, and the following In order to pull out the wire 20 for secondary bonding, it is necessary to perform the cutting in a state where the wire 20 is not fixed by the clamp.

ここで、上記特許文献2の方法のように、ホール部32の切断およびワイヤカットを1回の切断で行うようにした場合、ワイヤカットの完了が、当該1回の切断のうちのいつの時点となるかわからないので、当該ワイヤカットのタイミングを管理することができない。   Here, when the hole section 32 and the wire cut are performed by a single cut as in the method of the above-mentioned Patent Document 2, the completion of the wire cut is determined at the time of the one cut. Since it is not known, the timing of the wire cut cannot be managed.

そのため、ホール部32の切断時にワイヤ20がホール部32から切れて離れたとき、上記固定がなされていないワイヤ20は、キャピラリ40の先端部43からキャピラリ40の内部に引き戻されて、キャピラリ40から抜けてしまう。これが、ワイヤブレークである。そして、このようなワイヤブレークが発生すると、ワイヤボンディング装置そのものが停止してしまうなどの不具合が発生する。   Therefore, when the wire 20 is cut away from the hole portion 32 when the hole portion 32 is cut, the unfixed wire 20 is pulled back from the distal end portion 43 of the capillary 40 to the inside of the capillary 40 and is removed from the capillary 40. It will come off. This is a wire break. And when such a wire break occurs, troubles, such as a wire bonding apparatus itself stopping, generate | occur | produce.

本発明は、上記問題に鑑みてなされたものであり、プレボールボンディングを用いたワイヤボンディング方法において、プレボールのホール部を切断し、その切断面上に2次ボンディングしてワイヤを接合するにあたって、当該切断面の平坦性を極力損なうことなく、ホール部の切断におけるワイヤカットのタイミングを管理できるようにすることを目的とする。   The present invention has been made in view of the above problems, and in the wire bonding method using pre-ball bonding, the hole portion of the pre-ball is cut, and the secondary bonding is performed on the cut surface to join the wire. It is an object of the present invention to be able to manage the timing of wire cutting in cutting a hole portion without losing the flatness of the cut surface as much as possible.

上記目的を達成するため、本発明者は、プレボールのホール部を1回の切断によって完全に切断してワイヤカットを行うのではなく、2次ボンディング可能な切断面を形成しつつ、ホール部の一部は切断せずに残し、その後、改めて、切断されていない残し部を切断してワイヤカットを行うようにすれば、ワイヤカットのタイミングが管理できることに着目し、本発明を創出するに至った。   In order to achieve the above object, the present inventor does not perform wire cutting by completely cutting the hole portion of the preball by one cutting, but forming a cutting surface capable of secondary bonding, Focusing on the fact that the wire cutting timing can be managed by cutting the remaining part that has not been cut and then cutting the remaining part that has not been cut again, the present invention has been created. It was.

請求項1に記載の発明は、ワイヤ(20)が通る内孔(41)を有し、前記内孔(41)は先端部(43)にて開口する開口部(42)を有するキャピラリ(40)を用い、前記キャピラリ(40)の前記先端部(43)から突出する前記ワイヤ(20)の突出部を、被接合部材(10)の一面に押し付けることにより、前記被接合部材(10)の一面に前記ワイヤ(20)を接合するワイヤボンディング方法において、以下の各工程を有することを特徴とする。   The invention described in claim 1 has an inner hole (41) through which the wire (20) passes, and the inner hole (41) has a capillary (40) having an opening (42) opened at the tip (43). ) And pressing the protruding portion of the wire (20) protruding from the tip end portion (43) of the capillary (40) against one surface of the bonded member (10), The wire bonding method for bonding the wire (20) to one surface includes the following steps.

・キャピラリ(40)の先端部(43)から突出するワイヤ(20)の突出部をボール形状のイニシャルボール(21)として、これを被接合部材(10)の一面上に位置させ、キャピラリ(40)を下降することによって、イニシャルボール(21)を被接合部材(10)の一面に押し付け、これをキャピラリ(40)の先端部(43)における開口部(42)の周囲部で押しつぶすことにより、被接合部材(10)の一面に接合されたプレボール(30)を形成するものであって、
プレボール(30)が、被接合部材(10)の一面側から開口部(42)よりも径の大きな基部(31)と、基部(31)の上に位置し、イニシャルボール(21)の押しつぶしのときにイニシャルボール(21)の一部が内孔(41)に入り込むことにより形成されたワイヤ(20)よりも径が大きいホール部(32)とを有するものであるように、プレボール(30)の形成を行うプレボール形成工程。
The protruding portion of the wire (20) protruding from the tip (43) of the capillary (40) is a ball-shaped initial ball (21), which is positioned on one surface of the member to be joined (10), and the capillary (40 ), The initial ball (21) is pressed against one surface of the member to be joined (10), and this is crushed around the opening (42) at the tip (43) of the capillary (40), Forming a pre-ball (30) bonded to one surface of the member to be bonded (10),
The preball (30) is located on the base (31) having a diameter larger than the opening (42) from one surface side of the joined member (10) and the base (31), and the initial ball (21) is crushed. The preball (30) has a hole portion (32) having a diameter larger than that of the wire (20) formed by part of the initial ball (21) entering the inner hole (41). A pre-ball forming step for forming

・次に、プレボール(30)のうちホール部(32)の範囲の高さにキャピラリ(40)の先端部(43)が位置するように、キャピラリ(40)を上昇させ、その後、キャピラリ(40)を水平方向に移動させることにより、キャピラリ(40)の先端部(43)における開口部(42)の縁部でホール部(32)をその径方向の一端から他端側に向かって切断して平坦な切断面(33)を形成するとともに当該他端部では切断されないで内孔(41)内部のワイヤ(20)と繋がった繋がり部(34)を残すようにする切断面形成工程。   Next, the capillary (40) is raised so that the tip (43) of the capillary (40) is positioned at a height in the range of the hole (32) in the preball (30), and then the capillary (40 ) In the horizontal direction, the hole (32) is cut from one end in the radial direction to the other end at the edge of the opening (42) at the tip (43) of the capillary (40). Forming a flat cut surface (33) and leaving the connecting portion (34) connected to the wire (20) inside the inner hole (41) without being cut at the other end.

・次に、キャピラリ(40)を開口部(42)がホール部(32)の外側に位置するまで水平方向に移動させて、繋がり部(34)をホール部(32)の他端部からホール部(32)の外側に向かって水平方向に延びるように曲げ、さらに、キャピラリ(40)を下降させることにより、繋がり部(34)に繋がっているワイヤ(20)を、プレボール(30)の隣の被接合部材(10)の一面に押し付けて接合する捨てボンディング工程。   Next, the capillary (40) is moved in the horizontal direction until the opening (42) is positioned outside the hole (32), and the connecting portion (34) is moved from the other end of the hole (32) to the hole. The wire (20) connected to the connecting portion (34) is bent next to the pre-ball (30) by bending the outer portion (32) so as to extend in the horizontal direction and further lowering the capillary (40). Discard bonding step of pressing and joining one surface of the member to be joined (10).

・その後、プレボール(30)の隣に接合されたワイヤ(20)とキャピラリ(40)の内孔(41)内のワイヤ(20)とを切断するワイヤカット工程。   Thereafter, a wire cutting step of cutting the wire (20) joined next to the preball (30) and the wire (20) in the inner hole (41) of the capillary (40).

・次に、プレボール(30)における切断面(33)上に、キャピラリ(40)によってワイヤ(20)を接合する2次ボンディング工程。本方法は、これらの工程を行うことを特徴としている。   -Next, the secondary bonding process which joins the wire (20) with the capillary (40) on the cut surface (33) in the preball (30). The method is characterized by performing these steps.

それによれば、ホール部(32)の切断面(22)は平坦面となり、さらに当該切断面(33)の端部に繋がっている繋がり部(34)は、切断面(33)と水平方向に曲げられるので、繋がり部(34)が切断面(33)より突出するのを極力防止でき、切断面(33)の平坦性が損なわれるのを極力防止できる。   According to this, the cut surface (22) of the hole portion (32) is a flat surface, and the connecting portion (34) connected to the end of the cut surface (33) is in a horizontal direction with the cut surface (33). Since it bends, it can prevent that a connection part (34) protrudes from a cut surface (33) as much as possible, and can prevent that flatness of a cut surface (33) is impaired as much as possible.

また、ホール部(32)の切断におけるワイヤカットが、1回の切断ではなく、ワイヤ(20)と接続された繋がり部(34)を残しつつ切断面(34)を形成し、その後、改めて捨てボンディングを行った後に、ワイヤカット工程にてワイヤ(20)との切断を行うようにしているから、ワイヤカットのタイミングを管理できる。   Moreover, the wire cut in the cutting of the hole portion (32) forms the cut surface (34) while leaving the connecting portion (34) connected to the wire (20) instead of cutting once, and then discarded again. Since the wire (20) is cut in the wire cutting step after bonding, the timing of wire cutting can be managed.

よって、本発明によれば、プレボール(30)のホール部(32)を切断し、その切断面(33)上に2次ボンディングしてワイヤ(20)を接合するにあたって、当該切断面(33)の平坦性を極力損なうことなく、ホール部(32)の切断におけるワイヤカットのタイミングを管理することが可能となる。   Therefore, according to the present invention, when the hole (32) of the preball (30) is cut, and the wire (20) is joined by secondary bonding on the cut surface (33), the cut surface (33) It is possible to manage the timing of wire cutting in cutting the hole portion (32) without damaging the flatness of the hole as much as possible.

請求項2に記載の発明は、ワイヤ(20)が通る内孔(41)を有し、前記内孔(41)は先端部(43)にて開口する開口部(42)を有するキャピラリ(40)を用い、前記キャピラリ(40)の前記先端部(43)から突出する前記ワイヤ(20)の突出部を、被接合部材(10)の一面に押し付けることにより、前記被接合部材(10)の一面に前記ワイヤ(20)を接合するワイヤボンディング方法において、以下の各工程を有することを特徴とする。   The invention according to claim 2 has an inner hole (41) through which the wire (20) passes, and the inner hole (41) has a capillary (40) having an opening (42) opened at the tip (43). ) And pressing the protruding portion of the wire (20) protruding from the tip end portion (43) of the capillary (40) against one surface of the bonded member (10), The wire bonding method for bonding the wire (20) to one surface includes the following steps.

・上記請求項1のワイヤボンディング方法と同様のプレボール形成工程および切断面形成工程。   A pre-ball forming step and a cut surface forming step similar to the wire bonding method of claim 1.

・次に、繋がり部(34)を上方に延ばすようにキャピラリ(40)を上昇させ、その後、キャピラリ(40)を、開口部(42)がホール部(32)の外側に位置するまで水平方向に移動させ、その位置から下降させることで、繋がり部(34)におけるホール部(32)寄りの部位を曲げて当該曲げられた部位の機械的強度を低下させる繋がり部強度低下工程。   Next, the capillary (40) is raised so that the connecting portion (34) extends upward, and then the capillary (40) is moved horizontally until the opening (42) is positioned outside the hole portion (32). The connection part strength reduction process which bends the site | part close | similar to the hole part (32) in a connection part (34), and reduces the mechanical strength of the said bent part by making it move to (2) and lowering from the position.

・その後、キャピラリ(40)を上昇させて、曲げられた部位にて繋がり部(34)をホール部(32)から引きちぎるように切断するワイヤカット工程。   -Then, the capillary (40) is raised, and the wire cut process of cutting so that the connecting part (34) is torn off from the hole part (32) at the bent part.

・次に、プレボール(30)における切断面(33)上に、キャピラリ(40)によってワイヤ(20)を接合する2次ボンディング工程。本方法は、これらの工程を行うことを特徴としている。   -Next, the secondary bonding process which joins the wire (20) with the capillary (40) on the cut surface (33) in the preball (30). The method is characterized by performing these steps.

それによれば、ホール部(32)の切断面(33)は平坦面となり、さらに当該切断面(33)の端部に繋がっている繋がり部(34)は、機械的強度が低下したホール部(32)寄りの部位にて容易に切断できるため、切断残りを極力防止でき、切断面(33)の平坦性が損なわれるのを極力防止できる。   According to this, the cut surface (33) of the hole portion (32) is a flat surface, and the connecting portion (34) connected to the end of the cut surface (33) is a hole portion ( 32) Since it can be easily cut at a portion close to it, the remaining cutting can be prevented as much as possible, and the flatness of the cut surface (33) can be prevented as much as possible.

また、ホール部(32)の切断におけるワイヤカットが、1回の切断ではなく、ワイヤ(20)と接続された繋がり部(34)を残しつつ切断面(33)を形成し、その後、改めて繋がり部強度低下工程を行った後に、ワイヤカット工程にてワイヤ(20)との切断を行うようにしているから、ワイヤカットのタイミングを管理できる。   Moreover, the wire cut in the cutting | disconnection of a hole part (32) forms a cut surface (33), leaving the connection part (34) connected with the wire (20) instead of one time cutting | disconnection, and is connected again after that. Since the cutting with the wire (20) is performed in the wire cutting process after the partial strength reducing process, the timing of the wire cutting can be managed.

よって、本発明によれば、プレボール(30)のホール部(32)を切断し、その切断面(33)上に2次ボンディングしてワイヤ(20)を接合するにあたって、当該切断面(33)の平坦性を極力損なうことなく、ホール部(32)の切断におけるワイヤカットのタイミングを管理することが可能となる。   Therefore, according to the present invention, when the hole (32) of the preball (30) is cut, and the wire (20) is joined by secondary bonding on the cut surface (33), the cut surface (33) It is possible to manage the timing of wire cutting in cutting the hole portion (32) without damaging the flatness of the hole as much as possible.

ここで、請求項3に記載の発明のように、請求項1または2に記載のワイヤボンディング方法においては、ワイヤ(20)としてAuまたはCuよりなるものを用いることができる。   Here, as in the invention according to claim 3, in the wire bonding method according to claim 1 or 2, a wire (20) made of Au or Cu can be used.

なお、特許請求の範囲およびこの欄で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示す一例である。   In addition, the code | symbol in the bracket | parenthesis of each means described in the claim and this column is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

本発明の第1実施形態に係るワイヤボンディング方法を示す工程図である。It is process drawing which shows the wire bonding method which concerns on 1st Embodiment of this invention. 本発明の第2実施形態に係るワイヤボンディング方法を示す工程図である。It is process drawing which shows the wire bonding method which concerns on 2nd Embodiment of this invention. 従来の一般的なプレボールボンディングにより形成されたプレボールを示す図である。It is a figure which shows the preball formed by the conventional general preball bonding. 従来のプレボールの平坦化方法を示す工程図である。It is process drawing which shows the conventional preball flattening method.

以下、本発明の実施形態について図に基づいて説明する。なお、以下の各実施形態相互において、互いに同一もしくは均等である部分には、説明の簡略化を図るべく、図中、同一符号を付してある。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings in order to simplify the description.

(第1実施形態)
図1は、本発明の第1実施形態に係るプレボールボンディング用いたワイヤボンディング方法を示す工程図であり、各工程を断面的に示している。
(First embodiment)
FIG. 1 is a process diagram showing a wire bonding method using pre-ball bonding according to a first embodiment of the present invention, and shows each process in cross section.

本ボンディング方法は、図1(g)に示されるように、被接合部材10の一面にワイヤカットまでされたプレボール30を形成し、このプレボール30の切断面33上に、さらに2次ボンディングを行ってワイヤ20を接続してなる構造体を形成するものである。   In this bonding method, as shown in FIG. 1 (g), a preball 30 that has been wire-cut is formed on one surface of the member to be bonded 10, and secondary bonding is further performed on the cut surface 33 of the preball 30. Thus, a structure formed by connecting the wires 20 is formed.

まず、被接合部材10としては、たとえばプリント基板やセラミック基板上の導体、あるいは、リードフレームなどが挙げられる。また、ワイヤ20としては、典型的なプレボールボンディングに用いられるAuやCuなどよりなるワイヤが挙げられる。   First, as the member 10 to be joined, for example, a conductor on a printed board or a ceramic board, a lead frame, or the like can be cited. Moreover, as the wire 20, the wire which consists of Au, Cu, etc. which are used for typical preball bonding is mentioned.

そして、キャピラリ40は、この種のワイヤボンディング装置のものと同様、モータなどによって図1中の左右、上下および紙面垂直方向に移動できるものである。具体的には、被接合部材10の一面は、図1中の紙面垂直方向に直交する平面であり、この平面方向が水平方向となっており、当該平面方向に直交する方向が上下方向となっている。   The capillary 40 can be moved in the left-right, up-down, and vertical directions in FIG. 1 by a motor or the like, as in this type of wire bonding apparatus. Specifically, one surface of the member to be bonded 10 is a plane orthogonal to the paper surface vertical direction in FIG. 1, and this plane direction is a horizontal direction, and the direction orthogonal to the plane direction is the vertical direction. ing.

そして、キャピラリ40は、ワイヤが通る内孔41を有し、この内孔41はキャピラリ40の先端部43にて開口する開口部42を有する。そして、キャピラリ40は、その先端部43から突出するワイヤ20の突出部を、被接合部材10の一面に押し付けることにより、被接合部材10の一面にワイヤ20を接合する。   The capillary 40 has an inner hole 41 through which a wire passes, and the inner hole 41 has an opening 42 that opens at the tip 43 of the capillary 40. Then, the capillary 40 joins the wire 20 to one surface of the member to be bonded 10 by pressing the protruding portion of the wire 20 protruding from the distal end portion 43 against one surface of the member to be bonded 10.

ここで、ワイヤ20の被接合部材10の一面への接合は、当該接合部に対して、キャピラリ40から荷重、熱、超音波が印加されることにより、行われるようになっている。これら、荷重、熱、超音波の印加についても、一般のボンディング装置と同様である。   Here, the bonding of the wire 20 to one surface of the member to be bonded 10 is performed by applying a load, heat, and ultrasonic waves from the capillary 40 to the bonding portion. The application of load, heat, and ultrasonic waves is the same as that of a general bonding apparatus.

また、図示しないが、キャピラリ40の先端部43とは反対の端部である後端部側には、キャピラリ40に挿入されるワイヤ20がキャピラリ40の後端部側へ抜けるのを防止するために、ワイヤ20を挟んで固定する図示しないクランプが設けられている。このクランプは一般的なものと同様である。   In addition, although not shown, in order to prevent the wire 20 inserted into the capillary 40 from being pulled out to the rear end side of the capillary 40 on the rear end side that is the end opposite to the front end portion 43 of the capillary 40. In addition, a clamp (not shown) for fixing the wire 20 is provided. This clamp is similar to a general one.

そして、本ボンディング方法では、まず、図1(a)に示されるように、キャピラリ40の先端部43から突出するワイヤ20の突出部を、放電などによりボール形状のイニシャルボール21とする。ここで、イニシャルボール21の形成後には、上記クランプはオープン状態にあり、ワイヤ20の固定は解除された状態となっている。   In this bonding method, first, as shown in FIG. 1A, the protruding portion of the wire 20 protruding from the tip portion 43 of the capillary 40 is made into a ball-shaped initial ball 21 by discharge or the like. Here, after the initial ball 21 is formed, the clamp is in an open state, and the wire 20 is unfixed.

そして、クランプがオープンの状態にて、イニシャルボール21を被接合部材10の一面上に位置させ、図1(b)に示されるように、キャピラリ40を被接合部材10に向けて下降することによって、イニシャルボール21を被接合部材10の一面に押し付ける。それとともに、イニシャルボール21をキャピラリ40の先端部43における開口部42の周囲部で押しつぶす。   Then, with the clamp open, the initial ball 21 is positioned on one surface of the member to be bonded 10 and the capillary 40 is lowered toward the member to be bonded 10 as shown in FIG. The initial ball 21 is pressed against one surface of the bonded member 10. At the same time, the initial ball 21 is crushed around the opening 42 at the tip 43 of the capillary 40.

これにより、図1(b)に示されるように、押しつぶされたイニシャルボール21として、被接合部材10の一面に接合されたプレボール30が形成される。このプレボール30は、一般のものと同様、被接合部材10の一面側からキャピラリ40の開口部42よりも径の大きな基部31と、基部31の上に位置するホール部32とを有する。   As a result, as shown in FIG. 1B, the preball 30 joined to one surface of the joined member 10 is formed as the crushed initial ball 21. Like the general one, the preball 30 has a base 31 having a diameter larger than the opening 42 of the capillary 40 from one surface side of the member 10 to be joined and a hole 32 positioned on the base 31.

ここで、ホール部32は、イニシャルボール21の押しつぶしのときにイニシャルボール21の一部がキャピラリ40の内孔41に入り込むことにより形成された部位であり、ワイヤ20よりも径が大きい部位である。   Here, the hole portion 32 is a portion formed by part of the initial ball 21 entering the inner hole 41 of the capillary 40 when the initial ball 21 is crushed, and is a portion having a diameter larger than that of the wire 20. .

ここでは、キャピラリ40の内孔41は、その開口部42側の部位がラッパ状に拡径しているため、図1に示されるように、ホール部32は、ワイヤ20側から基部31側に向かってストレートな部位とラッパ状の部位とよりなる。なお、内孔41に上記ラッパ状の部分が無く、内孔41全体がストレートな孔である場合には、ホール部32全体もストレートなものとされる。   Here, since the inner hole 41 of the capillary 40 has a trumpet-shaped portion on the opening 42 side, the hole portion 32 extends from the wire 20 side to the base 31 side, as shown in FIG. It consists of a straight part and a trumpet-like part. In addition, when the inner hole 41 does not have the trumpet-shaped portion and the entire inner hole 41 is a straight hole, the entire hole portion 32 is also straight.

こうして、イニシャルボール21から基部31とホール部32とよりなるプレボール30を形成する工程がプレボール形成工程である。その後、図1(c)、(d)に示される切断面33を形成する切断面形成工程を行う。この切断面33は、2次ボンディングを行う面、すなわち、2次ボンディング面となるものである。   Thus, the process of forming the preball 30 including the base 31 and the hole 32 from the initial ball 21 is the preball formation process. Then, the cut surface formation process which forms the cut surface 33 shown by FIG.1 (c), (d) is performed. The cut surface 33 is a surface on which secondary bonding is performed, that is, a secondary bonding surface.

この切断面形成工程では、まず、図1(c)に示されるように、キャピラリ40を上昇させ、プレボール30のうちホール部32の範囲の高さに、キャピラリ40の先端部43を位置させる。   In this cut surface forming step, first, as shown in FIG. 1C, the capillary 40 is raised, and the tip portion 43 of the capillary 40 is positioned at a height in the range of the hole portion 32 in the preball 30.

その後、図1(d)に示されるように、キャピラリ40を水平方向に移動させる。これにより、キャピラリ40の先端部43における開口部42の縁部で、ホール部32をその径方向(図中の左右方向)の一端から他端側に向かって切断して平坦な切断面33を形成する。   Thereafter, as shown in FIG. 1D, the capillary 40 is moved in the horizontal direction. Thereby, the hole part 32 is cut | disconnected from the one end of the radial direction (left-right direction in a figure) to the other end side in the edge part of the opening part 42 in the front-end | tip part 43 of the capillary 40, and the flat cut surface 33 is obtained. Form.

ここで、ホール部32を当該他端部まで完全に切断してワイヤカットまで行うのではなく、ホール部32の他端部までは切断せず、当該他端部では切断されないでキャピラリ40の内孔41内部のワイヤ20と繋がった繋がり部34を残すようにする。   Here, the hole 32 is not completely cut to the other end and wire cut is performed, but the other end of the hole 32 is not cut and is not cut at the other end. The connecting portion 34 connected to the wire 20 inside the hole 41 is left.

また、このとき、2次ボンディングにてワイヤ20を切断面33に適切に接合するべく、切断面33の面積がワイヤ20の軸直交断面(つまり径方向)の断面積よりも大きい面積となるようにホール部32を切断することはもちろんである。ここまでが切断面形成工程である。   At this time, the area of the cut surface 33 is larger than the cross-sectional area of the wire 20 in the axis-perpendicular section (that is, the radial direction) in order to appropriately bond the wire 20 to the cut surface 33 by secondary bonding. Of course, the hole 32 is cut. The process up to here is the cut surface forming step.

次に、捨てボンディング工程を行う。この工程では、図1(e)に示されるように、キャピラリ40をその開口部42がホール部32の外側に位置するまで水平方向に移動させて、繋がり部34をホール部32の他端部からホール部32の外側に向かって水平方向に延びるように曲げる。   Next, a discarded bonding process is performed. In this step, as shown in FIG. 1 (e), the capillary 40 is moved in the horizontal direction until the opening 42 is located outside the hole portion 32, and the connecting portion 34 is moved to the other end of the hole portion 32. And bent so as to extend in the horizontal direction toward the outside of the hole 32.

さらに、図1(f)に示されるように、その位置からキャピラリ40を下降させることにより、繋がり部34に繋がっているワイヤ20を、プレボール30の隣の被接合部材10の一面に押し付けて接合する。   Further, as shown in FIG. 1 (f), by lowering the capillary 40 from that position, the wire 20 connected to the connecting portion 34 is pressed against one surface of the member to be bonded 10 adjacent to the preball 30 and bonded. To do.

この接合も、キャピラリ40を介して、当該ワイヤ20に荷重、熱、超音波振動を印加することにより行われる。イニシャルボール21の形成後から当該捨てボンディング工程までは、上記クランプはオープン状態にあり、ワイヤ20の固定は解除された状態となっている。   This bonding is also performed by applying a load, heat, and ultrasonic vibration to the wire 20 through the capillary 40. From the formation of the initial ball 21 to the disposal bonding step, the clamp is in an open state, and the wire 20 is unfixed.

その後、プレボール30の隣に接合されたワイヤ20とキャピラリ40の内孔41内のワイヤ20とを切断するワイヤカット工程を行う。このワイヤカット工程では、上記クランプのオープン状態にて、次の2次ボンディングのために、キャピラリ40を上昇させてキャピラリ40の先端部43からワイヤ20を引き出した後、上記クランプをシャット状態としてワイヤ20を固定した状態で、ワイヤカットを行う。   Thereafter, a wire cutting step of cutting the wire 20 bonded next to the preball 30 and the wire 20 in the inner hole 41 of the capillary 40 is performed. In this wire cutting step, in the open state of the clamp, for the next secondary bonding, the capillary 40 is raised and the wire 20 is pulled out from the distal end portion 43 of the capillary 40, and then the clamp is shut to the wire. Wire cutting is performed with 20 fixed.

こうして、図1(g)に示されるように、被接合部材10の一面にワイヤカットまでされたプレボール30を形成する。次に、このプレボール30における切断面33上に、図1(g)中の矢印に示されるように、キャピラリ40によってワイヤ20を接合する2次ボンディング工程を行う。この2次ボンディングは一般的な方法と同様に行われる。以上が本実施形態のワイヤボンディング方法である。   In this way, as shown in FIG. 1G, a preball 30 that has been wire cut is formed on one surface of the member 10 to be joined. Next, as shown by the arrow in FIG. 1 (g), a secondary bonding step of joining the wire 20 with the capillary 40 is performed on the cut surface 33 of the preball 30. This secondary bonding is performed in the same manner as a general method. The above is the wire bonding method of this embodiment.

ところで、本ワイヤボンディング方法によれば、ホール部32の切断面33は平坦面となり、さらに当該切断面33の端部に繋がっている繋がり部34は、切断面33と水平方向に曲げられるので、繋がり部34が切断面33より突出するのを極力防止できる。   By the way, according to this wire bonding method, the cut surface 33 of the hole portion 32 becomes a flat surface, and the connecting portion 34 connected to the end portion of the cut surface 33 is bent in the horizontal direction with the cut surface 33. It is possible to prevent the connecting portion 34 from protruding from the cut surface 33 as much as possible.

具体的に、図1に示されるように、繋がり部34は、切断面33と水平方向に延び、切断面33と同等かそれよりも低い高さとなるか、高くなったとしてもその度合いは極力小さいものとなる。よって、本実施形態によれば、ホール部32の切断面33の平坦性が損なわれるのを極力防止でき、結果、2次ボンディングを適切に行える。   Specifically, as shown in FIG. 1, the connecting portion 34 extends in the horizontal direction with the cut surface 33, and even if the height is equal to, lower than, or higher than the cut surface 33, the degree is as much as possible. It will be small. Therefore, according to this embodiment, it is possible to prevent the flatness of the cut surface 33 of the hole portion 32 from being lost as much as possible, and as a result, secondary bonding can be performed appropriately.

また、ホール部32の切断におけるワイヤカットが、1回の切断ではなく、ワイヤ20と接続された繋がり部34を残しつつ切断面33を形成し、その後、改めて捨てボンディングを行った後に、ワイヤカット工程にてワイヤ20との切断を行うようにしているから、ワイヤカットのタイミングを管理できる。つまり、捨てボンディング工程の後に行うワイヤカット工程にて、ワイヤカットを行うことが決まっているので、その時点で上記クランプによるワイヤ20の固定を行えばよい。   Further, the wire cut in the cutting of the hole portion 32 is not performed once, but the cut surface 33 is formed while leaving the connecting portion 34 connected to the wire 20, and then discarded again to perform the wire cutting. Since the wire 20 is cut in the process, the timing of wire cutting can be managed. That is, since it is determined that the wire cutting is performed in the wire cutting process performed after the discard bonding process, the wire 20 may be fixed by the clamp at that time.

このように、本実施形態によれば、プレボール30のホール部32を切断し、その切断面33上に2次ボンディングしてワイヤ20を接合するにあたって、当該切断面33の平坦性を極力損なうことなく、ホール部32の切断におけるワイヤカットのタイミングを管理することが可能となる。   As described above, according to the present embodiment, when the hole portion 32 of the preball 30 is cut and the wire 20 is joined by secondary bonding on the cut surface 33, the flatness of the cut surface 33 is lost as much as possible. In addition, it becomes possible to manage the timing of wire cutting in cutting the hole portion 32.

(第2実施形態)
図2は、本発明の第2実施形態に係るプレボールボンディングを用いたワイヤボンディング方法を示す工程図である。
(Second Embodiment)
FIG. 2 is a process diagram illustrating a wire bonding method using pre-ball bonding according to a second embodiment of the present invention.

本実施形態は、上記第1実施形態の製造方法に比べて、イニシャルボールの形成(上記図1(a)参照)から、プレボール形成工程(上記図1(b)参照)、切断面形成工程(上記図1(c)、(d)参照)までは同一であるが、それ以降の工程が相違するものであり、ここでは、その相違する工程を中心に述べることとする。   Compared with the manufacturing method of the first embodiment, the present embodiment is different from the initial ball formation (see FIG. 1A) to the preball formation step (see FIG. 1B) and the cut surface formation step (see FIG. 1B). The processes up to the above-described FIGS. 1C and 1D are the same, but the subsequent processes are different. Here, the different processes will be mainly described.

本実施形態の方法では、上記切断面形成工程の後、図2(a)、(b)、(c)に示される繋がり部強度低下工程を行う。この工程は、上記クランプはオープン状態にあり、ワイヤ20の固定は解除された状態となっている。まず、図2(a)に示されるように、繋がり部34の位置から繋がり部34が上方に延びるようにキャピラリ40を上昇させる。   In the method of the present embodiment, after the cut surface forming step, a connecting portion strength reducing step shown in FIGS. 2A, 2B, and 2C is performed. In this step, the clamp is in an open state, and the wire 20 is unfixed. First, as shown in FIG. 2A, the capillary 40 is raised so that the connecting portion 34 extends upward from the position of the connecting portion 34.

その後、図2(b)、(c)に示されるように、キャピラリ40を、その開口部42がホール部32の外側に位置するまで水平方向に移動させ、その位置から下降させる。そうすることで、繋がり部34におけるホール部32寄りの部位34aを曲げて、当該曲げられた部位34aの機械的強度を低下させる。   Thereafter, as shown in FIGS. 2B and 2C, the capillary 40 is moved in the horizontal direction until the opening 42 is located outside the hole portion 32, and is lowered from the position. By doing so, the part 34a near the hole part 32 in the connecting part 34 is bent, and the mechanical strength of the bent part 34a is lowered.

具体的には、この曲げられた部位34aには、たとえば紙を折り曲げてその折り曲げ部分にて切れやすくするのと同様に、折り目またはくびれ等が形成されるため、当該部位34aは繋がり部34のうちで最も機械的強度の弱い部位となる。ここまでが、繋がり部強度低下工程である。   Specifically, the bent portion 34a is formed with a crease or a constriction, for example, in the same manner as when folding paper and making it easy to cut at the bent portion. This is the site with the weakest mechanical strength. The process up to here is the connection part strength reduction step.

その後、図2(d)に示されるように、キャピラリ40を上昇させて、曲げられた部位34aにて繋がり部34をホール部32から引きちぎるように切断するワイヤカット工程を行う。   Thereafter, as shown in FIG. 2D, a wire cutting step is performed in which the capillary 40 is raised and the connecting portion 34 is cut off from the hole portion 32 at the bent portion 34a.

このワイヤカット工程では、上記クランプのオープン状態にて、次の2次ボンディングのために、キャピラリ40を上昇させてキャピラリ40の先端部43からワイヤ20を引き出した後、上記クランプをシャット状態としてワイヤ20を固定した状態で、上記曲げられた部位34aにて切断を行い、ワイヤカットを完了させる。   In this wire cutting step, in the open state of the clamp, for the next secondary bonding, the capillary 40 is raised and the wire 20 is pulled out from the distal end portion 43 of the capillary 40, and then the clamp is shut to the wire. In a state where 20 is fixed, cutting is performed at the bent portion 34a to complete the wire cutting.

こうして、図2(e)に示されるように、被接合部材10の一面にワイヤカットまでされたプレボール30が形成される。次に、このプレボール30における切断面33上に、上記第1実施形態と同様に、キャピラリ40によってワイヤ20を接合する2次ボンディング工程を行う。以上が本実施形態のワイヤボンディング方法である。   In this way, as shown in FIG. 2 (e), the preball 30 that has been wire cut is formed on one surface of the member to be joined 10. Next, a secondary bonding step of bonding the wire 20 with the capillary 40 is performed on the cut surface 33 of the preball 30 as in the first embodiment. The above is the wire bonding method of this embodiment.

ところで、本ワイヤボンディング方法によれば、ホール部32の切断面33は平坦面となり、さらに当該切断面33の端部に繋がっている繋がり部34は、機械的強度が低下したホール部32寄りの部位34aにて容易に切断できるため、切断残りを極力防止でき、切断面33の平坦性が損なわれるのを極力防止できる。   By the way, according to this wire bonding method, the cut surface 33 of the hole portion 32 becomes a flat surface, and the connecting portion 34 connected to the end portion of the cut surface 33 is closer to the hole portion 32 where the mechanical strength is reduced. Since it can be easily cut at the portion 34a, the remaining cutting can be prevented as much as possible, and the flatness of the cut surface 33 can be prevented as much as possible.

また、ホール部32の切断におけるワイヤカットが、1回の切断ではなく、ワイヤ20と接続された繋がり部34を残しつつ切断面33を形成し、その後、改めて繋がり部強度低下工程を行った後に、ワイヤカット工程にてワイヤ20との切断を行うようにしているから、ワイヤカットのタイミングを管理できる。   In addition, after the wire cut in the cutting of the hole portion 32 is not performed once, but the cut surface 33 is formed while leaving the connecting portion 34 connected to the wire 20, and then the connecting portion strength reducing step is performed again. Since the wire 20 is cut in the wire cutting step, the timing of the wire cutting can be managed.

このように、本実施形態によっても、プレボール30のホール部32を切断し、その切断面33上に2次ボンディングしてワイヤ20を接合するにあたって、当該切断面33の平坦性を極力損なうことなく、ホール部32の切断におけるワイヤカットのタイミングを管理することが可能となる。   As described above, even in the present embodiment, when the hole portion 32 of the preball 30 is cut, and the wire 20 is joined by secondary bonding on the cut surface 33, the flatness of the cut surface 33 is not lost as much as possible. It becomes possible to manage the timing of wire cutting in cutting the hole portion 32.

10 被接合部材
20 ワイヤ
21 イニシャルボール
30 プレボール
31 プレボールの基部
32 プレボールのホール部
33 切断面
34 繋がり部
40 キャピラリ
41 キャピラリの内孔
42 内孔の開口部
43 キャピラリの先端部
DESCRIPTION OF SYMBOLS 10 To-be-joined member 20 Wire 21 Initial ball 30 Pre-ball 31 Pre-ball base part 32 Pre-ball hole part 33 Cut surface 34 Connection part 40 Capillary 41 Capillary inner hole 42 Inner hole opening part 43 Capillary tip part

Claims (3)

ワイヤ(20)が通る内孔(41)を有し、前記内孔(41)は先端部(43)にて開口する開口部(42)を有するキャピラリ(40)を用い、前記キャピラリ(40)の前記先端部(43)から突出する前記ワイヤ(20)の突出部を、被接合部材(10)の一面に押し付けることにより、前記被接合部材(10)の一面に前記ワイヤ(20)を接合するワイヤボンディング方法において、
前記キャピラリ(40)の前記先端部(43)から突出する前記ワイヤ(20)の突出部をボール形状のイニシャルボール(21)として、これを前記被接合部材(10)の一面上に位置させ、前記キャピラリ(40)を下降することによって、前記イニシャルボール(21)を前記被接合部材(10)の一面に押し付け、これを前記キャピラリ(40)の前記先端部(43)における前記開口部(42)の周囲部で押しつぶすことにより、前記被接合部材(10)の一面に接合されたプレボール(30)を形成するものであって、
前記プレボール(30)が、前記被接合部材(10)の一面側から前記開口部(42)よりも径の大きな基部(31)と、前記基部(31)の上に位置し、前記イニシャルボール(21)の前記押しつぶしのときに前記イニシャルボール(21)の一部が前記内孔(41)に入り込むことにより形成された前記ワイヤ(20)よりも径が大きいホール部(32)とを有するものであるように、前記プレボール(30)の形成を行うプレボール形成工程と、
次に、前記プレボール(30)のうち前記ホール部(32)の範囲の高さに前記キャピラリ(40)の先端部(43)が位置するように、前記キャピラリ(40)を上昇させ、その後、前記キャピラリ(40)を水平方向に移動させることにより、前記キャピラリ(40)の前記先端部(43)における前記開口部(42)の縁部で前記ホール部(32)をその径方向の一端から他端側に向かって切断して平坦な切断面(33)を形成するとともに当該他端部では切断されないで前記内孔(41)内部の前記ワイヤ(20)と繋がった繋がり部(34)を残すようにする切断面形成工程と、
次に、前記キャピラリ(40)を前記開口部(42)が前記ホール部(32)の外側に位置するまで水平方向に移動させて、前記繋がり部(34)を前記ホール部(32)の他端部から前記ホール部(32)の外側に向かって水平方向に延びるように曲げ、さらに、前記キャピラリ(40)を下降させることにより、前記繋がり部(34)に繋がっている前記ワイヤ(20)を、前記プレボール(30)の隣の前記被接合部材(10)の一面に押し付けて接合する捨てボンディング工程と、
その後、前記プレボール(30)の隣に接合された前記ワイヤ(20)と前記キャピラリ(40)の前記内孔(41)内の前記ワイヤ(20)とを切断するワイヤカット工程と、
次に、前記プレボール(30)における前記切断面(33)上に、前記キャピラリ(40)によって前記ワイヤ(20)を接合する2次ボンディング工程とを行うことを特徴とするワイヤボンディング方法。
An inner hole (41) through which the wire (20) passes is used, and the inner hole (41) uses a capillary (40) having an opening (42) opened at a tip (43), and the capillary (40) The wire (20) is bonded to one surface of the member to be bonded (10) by pressing the protruding portion of the wire (20) protruding from the tip end portion (43) of the member to the one surface of the member to be bonded (10). In the wire bonding method to
The protruding portion of the wire (20) protruding from the tip portion (43) of the capillary (40) is a ball-shaped initial ball (21), which is positioned on one surface of the member to be joined (10), By lowering the capillary (40), the initial ball (21) is pressed against one surface of the member to be joined (10), and this is pressed against the opening (42) at the tip (43) of the capillary (40). ) To form a preball (30) joined to one surface of the joined member (10),
The preball (30) is positioned on the base (31) having a diameter larger than the opening (42) from one surface side of the member to be joined (10) and the base (31), and the initial ball ( 21) having a hole portion (32) having a diameter larger than that of the wire (20) formed by part of the initial ball (21) entering the inner hole (41) at the time of the crushing A preball forming step of forming the preball (30),
Next, the capillary (40) is raised so that the tip (43) of the capillary (40) is positioned at a height in the range of the hole (32) of the preball (30), and then By moving the capillary (40) in the horizontal direction, the hole (32) is moved from one end in the radial direction at the edge of the opening (42) at the tip (43) of the capillary (40). A flat cut surface (33) is formed by cutting toward the other end side, and a connecting portion (34) connected to the wire (20) inside the inner hole (41) without being cut at the other end portion is formed. A cut surface forming step to leave,
Next, the capillary (40) is moved in the horizontal direction until the opening (42) is located outside the hole (32), and the connecting portion (34) is moved to the other of the hole (32). The wire (20) connected to the connecting portion (34) by bending so as to extend in the horizontal direction from the end portion toward the outside of the hole portion (32) and further lowering the capillary (40). A discarding bonding step of pressing and bonding to one surface of the member to be bonded (10) next to the preball (30);
Then, a wire cutting step of cutting the wire (20) joined next to the preball (30) and the wire (20) in the inner hole (41) of the capillary (40);
Next, a secondary bonding step of joining the wire (20) with the capillary (40) on the cut surface (33) of the preball (30) is performed.
ワイヤ(20)が通る内孔(41)を有し、前記内孔(41)は先端部(43)にて開口する開口部(42)を有するキャピラリ(40)を用い、前記キャピラリ(40)の前記先端部(43)から突出する前記ワイヤ(20)の突出部を、被接合部材(10)の一面に押し付けることにより、前記被接合部材(10)の一面に前記ワイヤ(20)を接合するワイヤボンディング方法において、
前記キャピラリ(40)の前記先端部(43)から突出する前記ワイヤ(20)の突出部をボール形状のイニシャルボール(21)として、これを前記被接合部材(10)の一面上に位置させ、前記キャピラリ(40)を下降することによって、前記イニシャルボール(21)を前記被接合部材(10)の一面に押し付け、これを前記キャピラリ(40)の前記先端部(43)における前記開口部(42)の周囲部で押しつぶすことにより、前記被接合部材(10)の一面に接合されたプレボール(30)を形成するものであって、
前記プレボール(30)が、前記被接合部材(10)の一面側から前記開口部(42)よりも径の大きな基部(31)と、前記基部(31)の上に位置し、前記イニシャルボール(21)の前記押しつぶしのときに前記イニシャルボール(21)の一部が前記内孔(41)に入り込むことにより形成された前記ワイヤ(20)よりも径が大きいホール部(32)とを有するものであるように、前記プレボール(30)の形成を行うプレボール形成工程と、
次に、前記プレボール(30)のうち前記ホール部(32)の範囲の高さに前記キャピラリ(40)の先端部(43)が位置するように、前記キャピラリ(40)を上昇させ、その後、前記キャピラリ(40)を水平方向に移動させることにより、前記キャピラリ(40)の前記先端部(43)における前記開口部(42)の縁部で前記ホール部(32)をその径方向の一端から他端側に向かって切断して平坦な切断面(33)を形成するとともに当該他端部では切断されないで前記内孔(41)内部の前記ワイヤ(20)と繋がった繋がり部(34)を残すようにする切断面形成工程と、
次に、前記繋がり部(34)を上方に延ばすように前記キャピラリ(40)を上昇させ、その後、前記キャピラリ(40)を、前記開口部(42)が前記ホール部(32)の外側に位置するまで水平方向に移動させ、その位置から下降させることで、前記繋がり部(34)における前記ホール部(32)寄りの部位を曲げて当該曲げられた部位の機械的強度を低下させる繋がり部強度低下工程と、
その後、前記キャピラリ(40)を上昇させて、前記曲げられた部位にて前記繋がり部(34)を前記ホール部(32)から引きちぎるように切断するワイヤカット工程と、
次に、前記プレボール(30)における前記切断面(33)上に、前記キャピラリ(40)によって前記ワイヤ(20)を接合する2次ボンディング工程とを行うことを特徴とするワイヤボンディング方法。
An inner hole (41) through which the wire (20) passes is used, and the inner hole (41) uses a capillary (40) having an opening (42) opened at a tip (43), and the capillary (40) The wire (20) is bonded to one surface of the member to be bonded (10) by pressing the protruding portion of the wire (20) protruding from the tip end portion (43) of the member to the one surface of the member to be bonded (10). In the wire bonding method to
The protruding portion of the wire (20) protruding from the tip portion (43) of the capillary (40) is a ball-shaped initial ball (21), which is positioned on one surface of the member to be joined (10), By lowering the capillary (40), the initial ball (21) is pressed against one surface of the member to be joined (10), and this is pressed against the opening (42) at the tip (43) of the capillary (40). ) To form a preball (30) joined to one surface of the joined member (10),
The preball (30) is positioned on the base (31) having a diameter larger than the opening (42) from one surface side of the member to be joined (10) and the base (31), and the initial ball ( 21) having a hole portion (32) having a diameter larger than that of the wire (20) formed by part of the initial ball (21) entering the inner hole (41) at the time of the crushing A preball forming step of forming the preball (30),
Next, the capillary (40) is raised so that the tip (43) of the capillary (40) is positioned at a height in the range of the hole (32) of the preball (30), and then By moving the capillary (40) in the horizontal direction, the hole (32) is moved from one end in the radial direction at the edge of the opening (42) at the tip (43) of the capillary (40). A flat cut surface (33) is formed by cutting toward the other end side, and a connecting portion (34) connected to the wire (20) inside the inner hole (41) without being cut at the other end portion is formed. A cut surface forming step to leave,
Next, the capillary (40) is raised so as to extend the connecting portion (34) upward, and then the capillary (40) is positioned so that the opening (42) is located outside the hole portion (32). The connecting portion strength is lowered by moving the portion in the horizontal direction until it is lowered and lowering the mechanical strength of the bent portion by bending the portion close to the hole portion (32) in the connecting portion (34). A lowering process;
Thereafter, the capillary (40) is raised, and a wire cutting step of cutting the connection portion (34) so as to be torn off from the hole portion (32) at the bent portion;
Next, a secondary bonding step of joining the wire (20) with the capillary (40) on the cut surface (33) of the preball (30) is performed.
前記ワイヤ(20)としてAuまたはCuよりなるものを用いることを特徴とする請求項1または2に記載のワイヤボンディング方法。   The wire bonding method according to claim 1 or 2, wherein the wire (20) is made of Au or Cu.
JP2010091411A 2010-04-12 2010-04-12 Wire bonding method Expired - Fee Related JP5359977B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010091411A JP5359977B2 (en) 2010-04-12 2010-04-12 Wire bonding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010091411A JP5359977B2 (en) 2010-04-12 2010-04-12 Wire bonding method

Publications (2)

Publication Number Publication Date
JP2011222813A true JP2011222813A (en) 2011-11-04
JP5359977B2 JP5359977B2 (en) 2013-12-04

Family

ID=45039387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2010091411A Expired - Fee Related JP5359977B2 (en) 2010-04-12 2010-04-12 Wire bonding method

Country Status (1)

Country Link
JP (1) JP5359977B2 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05235002A (en) * 1992-02-24 1993-09-10 Matsushita Electric Ind Co Ltd Bump forming method
JP2000357700A (en) * 1999-06-14 2000-12-26 Denso Corp Ball-bonding method and method of connecting electronic component
JP2004247674A (en) * 2003-02-17 2004-09-02 Shinkawa Ltd Method for wire bonding
JP2006222128A (en) * 2005-02-08 2006-08-24 Shinkawa Ltd Wire bonding method
JP2007266062A (en) * 2006-03-27 2007-10-11 Toshiba Corp Process for manufacturing semiconductor device
JP2009054950A (en) * 2007-08-29 2009-03-12 Tokai Rika Co Ltd Bump forming method
JP2010067786A (en) * 2008-09-10 2010-03-25 Kaijo Corp Wire bonding method, wire bonding apparatus, and wire bonding control program

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05235002A (en) * 1992-02-24 1993-09-10 Matsushita Electric Ind Co Ltd Bump forming method
JP2000357700A (en) * 1999-06-14 2000-12-26 Denso Corp Ball-bonding method and method of connecting electronic component
JP2004247674A (en) * 2003-02-17 2004-09-02 Shinkawa Ltd Method for wire bonding
JP2006222128A (en) * 2005-02-08 2006-08-24 Shinkawa Ltd Wire bonding method
JP2007266062A (en) * 2006-03-27 2007-10-11 Toshiba Corp Process for manufacturing semiconductor device
JP2009054950A (en) * 2007-08-29 2009-03-12 Tokai Rika Co Ltd Bump forming method
JP2010067786A (en) * 2008-09-10 2010-03-25 Kaijo Corp Wire bonding method, wire bonding apparatus, and wire bonding control program

Also Published As

Publication number Publication date
JP5359977B2 (en) 2013-12-04

Similar Documents

Publication Publication Date Title
US7934634B2 (en) Wire bonding method
JP4467631B1 (en) Wire bonding method
KR100274137B1 (en) Semicondoctor device and wire bonding method
KR20010039884A (en) Method for forming pin-form wires and the like
JP2007134611A (en) Wire bonding method
JP4787374B2 (en) Semiconductor device manufacturing method and wire bonding apparatus
JPH10135221A (en) Bump-forming method
JP2010103157A (en) Wire bonding method
JP5135164B2 (en) Bonding method
JP5359977B2 (en) Wire bonding method
JP2007144436A (en) Welding structure, its welding method, and controller using the same
KR100327071B1 (en) Wire bonding method
TW200529397A (en) Method for producing a wedge-wedge wire connection
JPH1064941A (en) Capillary for wire bonding device
KR100275254B1 (en) Wire bonding method
US20010023534A1 (en) Bent wire forming method
TWI585927B (en) Method for producing semiconductor apparatus, semiconductor apparatus and wire bonding apparatus
WO2015125671A1 (en) Method for producing semiconductor device, and wire-bonding device
TWI739379B (en) Semiconductor device, semiconductor device manufacturing method, and wire bonding device
JP2009054950A (en) Bump forming method
KR20060102495A (en) Method for producing a wire connection
JP2007266062A (en) Process for manufacturing semiconductor device
US20160293323A1 (en) Coil end connecting structure
JP4266369B2 (en) Wire bonding method
TWI827950B (en) Wire bonding apparatus and method for manufacturing semiconductor device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20120604

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20130108

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20130110

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20130218

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20130806

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20130819

R151 Written notification of patent or utility model registration

Ref document number: 5359977

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees