JP3262657B2 - Bonding method and bonding structure - Google Patents

Bonding method and bonding structure

Info

Publication number
JP3262657B2
JP3262657B2 JP31348993A JP31348993A JP3262657B2 JP 3262657 B2 JP3262657 B2 JP 3262657B2 JP 31348993 A JP31348993 A JP 31348993A JP 31348993 A JP31348993 A JP 31348993A JP 3262657 B2 JP3262657 B2 JP 3262657B2
Authority
JP
Japan
Prior art keywords
bonding
bump
metal wire
metal
aluminum
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.)
Expired - Fee Related
Application number
JP31348993A
Other languages
Japanese (ja)
Other versions
JPH07169797A (en
Inventor
良一 梶原
敏行 高橋
光雄 加藤
和弥 高橋
和夫 羽鳥
富男 山田
稔 丸田
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP31348993A priority Critical patent/JP3262657B2/en
Publication of JPH07169797A publication Critical patent/JPH07169797A/en
Application granted granted Critical
Publication of JP3262657B2 publication Critical patent/JP3262657B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Wire Bonding (AREA)

Abstract

PURPOSE:To provide a bonding method which does not damage a terminal board and a metal wire at all in a bonding operation and which does not cause a bonding defect after the bonding operation. CONSTITUTION:In a bonding method, a bump 7 is compression-bonded to a connecting terminal 1 by using a bonding tool 5, the surface of the bump 7 is then flattened, and a metal wire 10 is expression-bonded to the bump 7 whose surface has been flattened. In the bonding method, the material of the bump 7 is selected from a material whose hardness is nearly equal to, or lower than, the hardness of the metal wire 10, and the bump 7 whose surface has been flattened is shaped in such a way that its diameter is larger than the diameter of the metal wire 10 and that its thickness is large. Then, the metal wire 10 is bonded in such a way that a bonding part is embedded in the flat surface of the bump 7 by an ultrasonic expression-bonding operation at room temperature.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、ボンディング方法及び
ボンディング構造に係わり、特に、ボンディング領域、
バンプ、金属ワイヤを構成する導電材料の選択及びボン
ディング状態の改良を行ったボンディング方法及びボン
ディング構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding method and a bonding structure.
The present invention relates to a bonding method and a bonding structure in which a conductive material constituting a bump and a metal wire is selected and a bonding state is improved.

【０００２】[0002]

【従来の技術】従来、金属ワイヤをボンディング領域に
ボンディングさせるボンディング手段には、ボンディン
グツ−ルに挿入装着させた金属ワイヤの先端に、放電等
の熱を利用して金属ボ−ルを形成し、この金属ボ−ル
を、ボンディングツ−ルで抑えながら熱圧着、熱超音波
接合、超音波接合のいずれかの手段により、ボンディン
グ領域に圧着させるボ−ルボンディング方法、及び、ボ
ンディングツ−ルに挿入装着させた金属ワイヤの先端
を、ボンディングツ−ルによって直接抑え、熱あるいは
超音波を加えてボンディング領域に圧着させるウェッジ
ボンディング方法の２つの手段が知られている。2. Description of the Related Art Conventionally, as a bonding means for bonding a metal wire to a bonding area, a metal ball is formed at the tip of a metal wire inserted and mounted on a bonding tool by utilizing heat such as electric discharge. A ball bonding method for bonding the metal ball to a bonding region by any one of thermocompression bonding, thermosonic bonding, and ultrasonic bonding while suppressing the metal ball with a bonding tool; and a bonding tool. There are known two wedge bonding methods in which the tip of a metal wire inserted and mounted on a wire is directly held down by a bonding tool, and heat or ultrasonic waves are applied to the wire to bond it to a bonding area.

【０００３】これらボンディング手段の対象となるボン
ディング領域は、薄膜技術あるいは厚膜技術によって形
成された微小面積の膜からなる部分であって、そのボン
ディング領域の導電材質には、デバイスや基板の配線に
用いられる材料と同じ材料、または金属ワイヤとの接合
性に優れた材料が選択される。例えば、ボンディング領
域が、半導体デバイスや薄膜デバイスにおける接続端子
であるときには、接続端子の表面部分にアルミニウム
（Ａｌ）または金（Ａｕ）の蒸着膜が用いられ、一方、
リ−ドフレ−ムや配線基板における接続端子であるとき
には、接続端子の表面部分にアルミニウム（Ａｌ）、金
（Ａｕ）、銀（Ａｇ）、パラジウム（Ｐｄ）、ニッケル
（Ｎｉ）の蒸着膜またはめっき膜が用いられている。[0003] The bonding area to be subjected to these bonding means is a portion composed of a film having a small area formed by a thin film technique or a thick film technique, and the conductive material of the bonding area is used for wiring of a device or a substrate. The same material as the material to be used or a material excellent in bonding property with the metal wire is selected. For example, when the bonding region is a connection terminal in a semiconductor device or a thin film device, a deposition film of aluminum (Al) or gold (Au) is used on the surface of the connection terminal.
When it is a connection terminal in a lead frame or a wiring board, the surface portion of the connection terminal is deposited or plated with aluminum (Al), gold (Au), silver (Ag), palladium (Pd), nickel (Ni). A membrane is used.

【０００４】また、近年になって、材料コストの低減を
図るため、ボンディング領域を特別な構造の接続端子に
せずに、銅（Ｃｕ）系の素材によって構成し、この接続
端子に直接金属ワイヤをボンディングするボンディング
手段も見られるようになった。しかし、いずれのボンデ
ィング手段も、ボンディング領域となる接続端子は、薄
膜技術あるいは厚膜技術で形成された接続端子であっ
て、そこに金属ワイヤを直接ボンディングさせる構造の
ものである。In recent years, in order to reduce the material cost, the bonding region is made of a copper (Cu) -based material without using a connection terminal having a special structure, and a metal wire is directly connected to the connection terminal. Bonding means for bonding have come to be seen. However, any of the bonding means has a structure in which a connection terminal serving as a bonding region is a connection terminal formed by a thin film technique or a thick film technique, and a metal wire is directly bonded to the connection terminal.

【０００５】これに対し、最近になって、ボンディング
領域（ボンディングパッド）上に圧着したバンプを介し
て、リードを前記ボンディングパッドにボンディングさ
せるボンディング手段が開発され、その一例とし、特開
平５−５５２９７号公報に開示のものがある。On the other hand, recently, a bonding means for bonding a lead to the bonding pad via a bump pressed on a bonding area (bonding pad) has been developed. There is one disclosed in Japanese Patent Publication No.

【０００６】前記開示によるボンディング手段は、ボン
ディングツ−ルに挿入保持させた金属ワイヤの先端を加
熱溶融し、ボンディングパッド上にボールバンプを形成
圧着させた後に、金属ワイヤを切断し、次いで、ボンデ
ィングツ−ルの先端の平坦部を用いて前記ボールバンプ
の上部を平坦化し、ＴＡＢテープを用いて前記バンプと
銅箔リードとの位置合わせを行い、その後、この銅箔リ
ードを前記バンプに圧着させてボンディングを行う第１
のボンディング手段、及び、この第１のボンディング手
段を改良したもので、ボンディングツ−ルに挿入保持さ
せた金属ワイヤの先端を加熱溶融し、ボンディングパッ
ド上にボールバンプを形成圧着させた後に、金属ワイヤ
を切断し、次いで、ボンディングツ−ルの先端の平坦部
を用いて前記ボールバンプの上部を平坦化し、この上部
を平坦化したバンプの表面全体にに低融点の金属層を形
成し、前と同様にＴＡＢテープを用いて前記低融点の金
属層を形成させたバンプと銅箔リードとの位置合わせを
行い、その後、この銅箔リードを前記低融点の金属層に
熱圧着させてボンディングを行う第２のボンディング手
段からなるものである。The bonding means according to the above disclosure heats and melts the tip of a metal wire inserted and held in a bonding tool, forms a ball bump on a bonding pad and press-bonds it, cuts the metal wire, and then performs bonding. The top of the ball bump is flattened using a flat portion at the tip of the tool, the bump and the copper foil lead are aligned using a TAB tape, and then the copper foil lead is pressed against the bump. First to perform bonding
The first bonding means is improved by heating and melting the tip of a metal wire inserted and held in a bonding tool to form a ball bump on a bonding pad and press-bonding. The wire is cut, and then the upper portion of the ball bump is flattened using a flat portion at the tip of a bonding tool, and a low melting point metal layer is formed on the entire surface of the bump having the flattened upper portion. In the same manner as described above, the bump having the low melting point metal layer formed thereon is aligned with the copper foil lead using a TAB tape, and then the copper foil lead is thermocompressed to the low melting point metal layer to perform bonding. It comprises a second bonding means for performing.

【０００７】[0007]

【発明が解決しようとする課題】ところで、かかるワイ
ヤボンディング手段においては、要求される性能によっ
て異なるものの、以下に述べるような種々の課題が存在
することが判明した。By the way, it has been found that such a wire bonding means has various problems as described below, although it depends on the required performance.

【０００８】第１の課題は、ボンディング領域となる接
続端子の狭ピッチ化や金属ワイヤの機械的剛性を低下を
図るワイヤの細径化に起因する課題であり、第２の課題
は、異種金属の界面部分に成長する脆い金属間化合物に
基づく強度劣化に起因する課題である。第３の課題は、
リ−ドフレ−ムの非めっき化や厚膜印刷配線基板への裸
チップの搭載に基づく接合不良に起因する課題であり、
第４の課題は、金属ワイヤと接続端子の下地基材との熱
膨張差に基づく熱疲労破壊に起因する課題である。The first problem is caused by the narrowing of the pitch of the connection terminals serving as the bonding area and the reduction in the diameter of the wire for reducing the mechanical rigidity of the metal wire. The problem is caused by the strength deterioration due to the brittle intermetallic compound that grows at the interface portion of the alloy. The third challenge is
The problem is caused by non-plating of the lead frame or bonding failure due to mounting of a bare chip on a thick film printed wiring board.
The fourth problem is a problem caused by thermal fatigue failure based on a difference in thermal expansion between a metal wire and a base material of a connection terminal.

【０００９】まず、前記第１の課題について見ると、加
熱温度に制約がある超音波ウェッジボンディングの場合
は、十分な接合強度を得るためのワイヤ変形率がワイヤ
の細径化に伴って大きくなり、ワイヤの変形の増大によ
ってワイヤネック部の強度が低下する。このワイヤネッ
ク部の強度の低下は、ワイヤと接続端子の接合性が悪い
こと、及び、接続端子の厚みが薄くさらにその硬度がワ
イヤに比べて高いこと等により、ワイヤの変形を大きく
しないと十分な接合強度が得られないことに基づいてい
る。即ち、常温の超音波ボンディングは、接合表面に化
学的あるいは物理的に吸着している汚染物質や酸化膜
を、摩擦という機械的な手段により界面から除去し、清
浄な金属面同士を密着させて接合させるものであるた
め、両者の材質の硬度が異なり、特に、ワイヤの硬度が
接続端子の硬度に比べて低い場合には、硬い接続端子側
で清浄面が得られるようにすると、軟かいワイヤの変形
が過大となり、ワイヤネック部の強度が著しく低下する
ようになる。このワイヤネック部の強度を上げるには、
ワイヤの変形を小さくすればよいが、接続端子の変形が
少ないときにはワイヤと接続端子との接触面積が少なく
なり、さらに清浄面が少ない範囲で形成されるために接
合率（真実接合面積／見かけの接合面積）も少なくな
り、界面強度を向上することができない。また、ボ−ル
ボンディングの場合は、接合時の荷重を２０ｇ以下に下
げることが困難で、ボンディングが高荷重になるばかり
か、荷重印加開始時のボ−ル変形が大きくなり、それに
伴い大きな超音波パワ−を必要とするため、接続端子の
下地を損傷させる割合が増大する。即ち、小ボ−ルボン
ディングにおける接続端子の下地の損傷は、ボンディン
グツール上の制約から、ボ−ルサイズに合わせて接合荷
重を小さくすることができず、単位面積当りの応力が高
くなるためである。First, regarding the first problem, in the case of ultrasonic wedge bonding in which the heating temperature is restricted, the wire deformation rate for obtaining a sufficient bonding strength increases as the wire diameter decreases. In addition, the strength of the wire neck decreases due to the increase in the deformation of the wire. This decrease in the strength of the wire neck portion is due to poor bonding properties between the wire and the connection terminal, and because the thickness of the connection terminal is thin and its hardness is higher than that of the wire. It is based on the fact that a high bonding strength cannot be obtained. That is, room-temperature ultrasonic bonding removes contaminants and oxide films that are chemically or physically adsorbed on the bonding surface from the interface by mechanical means such as friction, and adheres clean metal surfaces to each other. Since the hardness of the two materials is different because they are joined, especially when the hardness of the wire is lower than the hardness of the connection terminal, if a clean surface is obtained on the hard connection terminal side, a soft wire Is excessively deformed, and the strength of the wire neck portion is significantly reduced. To increase the strength of this wire neck,
The deformation of the wire may be reduced, but when the deformation of the connection terminal is small, the contact area between the wire and the connection terminal is reduced, and the clean surface is formed in a small area. Bonding area) is reduced, and the interface strength cannot be improved. Further, in the case of ball bonding, it is difficult to reduce the load at the time of joining to 20 g or less. Not only is the bonding load increased, but the ball deformation at the start of the load application becomes large, and accordingly, a large super The need for sonic power increases the rate of damaging the base of the connection terminal. That is, the damage of the base of the connection terminal in the small ball bonding cannot be reduced according to the ball size due to the restriction on the bonding tool, and the stress per unit area increases. .

【００１０】次いで、前記第２の課題について見ると、
例えば、アルミニウム（Ａｌ）の接続端子と、金（Ａ
ｕ）や銅（Ｃｕ）製の金属ワイヤとの組合せ、アルミニ
ウム（Ａｌ）製の金属ワイヤと銅（Ｃｕ）のフレ−ムと
の組合せ等に場合は、百数十℃の温度下でそれらの接合
界面に金属間化合物が簡単に形成されるようになり、原
子拡散に伴うボイドの発生と相俟って強度が初期強度の
数分の１以下に低下し、熱応力の発生時に前記接合界面
が剥離破断して断線不良を生じる。これは、接続端子の
材質とワイヤの材質とを任意に選択できないためであっ
て、実製品、例えば、半導体パッケ−ジ等においては、
ＬＳＩの内部配線がアルミニウム（Ａｌ）合金であるた
め、ＬＳＩの製造プロセス上、接続端子の材質も同様の
アルミニウム（Ａｌ）合金が用いられ、一方、パッケ−
ジ組立に用いられる配線ワイヤは、接合性や耐食性、電
気的特性等の点から金（Ａｕ）のワイヤが用いられる。
この場合、アルミニウム（Ａｌ）と金（Ａｕ）との組合
せを用いると、それらの接合部に１５０乃至２００℃の
比較的低い温度で簡単にパ−プルプレ−グと呼ばれる脆
くて弱い金属間化合物が成長し、高温環境下で、高信頼
性が要求される自動車搭載用パッケ−ジとして、実用上
支障をきたしている。また、この実製品において、接続
端子の材質やワイヤの材質を変更させようすれば、製造
設備の変更やプロセス工程数の増加を招き、製品のコス
トアップになって実用上困難である。Next, looking at the second problem,
For example, a connection terminal of aluminum (Al) and gold (A)
u) or a combination of metal wires made of copper (Cu), or a combination of a metal wire made of aluminum (Al) and a frame of copper (Cu). The intermetallic compound can be easily formed at the bonding interface, the strength is reduced to a fraction of the initial strength, in combination with the generation of voids due to atomic diffusion, and when the thermal stress occurs, the bonding interface is reduced. Peels and breaks, resulting in disconnection failure. This is because the material of the connection terminal and the material of the wire cannot be arbitrarily selected, and in an actual product, for example, a semiconductor package or the like,
Since the internal wiring of the LSI is made of an aluminum (Al) alloy, the same aluminum (Al) alloy is used as the material of the connection terminal in the LSI manufacturing process.
As the wiring wire used in the assembly, a gold (Au) wire is used from the viewpoints of bonding properties, corrosion resistance, electrical characteristics, and the like.
In this case, when a combination of aluminum (Al) and gold (Au) is used, a brittle and weak intermetallic compound called a purple plaque is easily formed at a relatively low temperature of 150 to 200 ° C. at the joint thereof. It has grown and has been hindered in practical use as a package for automobiles requiring high reliability in a high temperature environment. Further, in this actual product, if the material of the connection terminal or the material of the wire is changed, the production equipment is changed and the number of process steps is increased, which increases the cost of the product and is practically difficult.

【００１１】続いて、第３の課題について見ると、非め
っき化リ−ドフレ−ムは、通常、容易に酸化する銅（Ｃ
ｕ）合金からなるため、保管環境状態や保管時間の経過
に応じて表面の酸化が進行し、その酸化皮膜の厚さが数
十Åを超えると、急激に接合特性が劣化して未接合型不
良を生じるようになる。また、有機配線基板に裸チップ
とパッケ−ジを混載実装するモジュ−ルやＩＣカ−ド
は、パッケ−ジを予め半田付けして搭載させ、その後、
チップの接続端子と基板上の接続端子をワイヤボンディ
ングで接続して組み立てを行うが、この半田付けの際に
基板上の接続端子がフラックス等で汚され、ワイヤボン
ディング時に接合不良が生じる。これら接合不良の原因
となる保管環境時の接合部表面の酸化やボンディング工
程以前の組立てプロセスにおける接続端子表面の有機物
や無機物による汚染は、ボンディングの直前に接合部を
クリ−ニングすればその原因を除去できるが、クリ−ニ
ング工程を設けることは、製造設備のコスト高を招き、
実用的でない。Continuing with the third problem, non-plated lead frames typically contain copper (C), which readily oxidizes.
u) Since it is made of an alloy, the oxidation of the surface progresses as the storage environment and storage time elapses, and when the thickness of the oxide film exceeds several tens of mm, the bonding characteristics are rapidly deteriorated and the unbonded type It causes defects. Modules and IC cards for mounting a bare chip and a package on an organic wiring board are mounted by soldering the package in advance.
Assembling is performed by connecting the connection terminals of the chip and the connection terminals on the substrate by wire bonding. However, the connection terminals on the substrate are contaminated with flux or the like during the soldering, and a bonding failure occurs during wire bonding. Oxidation of the surface of the joint in a storage environment that may cause these defective connections and contamination of the connection terminal surface with organic and inorganic substances in the assembly process prior to the bonding step can be caused by cleaning the joint immediately before bonding. Although it can be removed, the provision of the cleaning step causes an increase in the cost of manufacturing equipment,
Not practical.

【００１２】最後に、第４の課題について見ると、アル
ミニウム（Ａｌ）の蒸着膜を有するシリコン（Ｓｉ）チ
ップの接続端子に太径の金属ワイヤが接合された場合等
においては、動作時の発熱によって金属ワイヤとシリコ
ン（Ｓｉ）チップとの間に熱歪が生じ、前記接合部に熱
疲労によるクラックが成長して最終的に破壊に至る。こ
のクラックの発生は、主として、ワイヤと接続基板との
間の熱膨張差が大きく、両者の接合部の長さが長いため
に生じる。Finally, regarding the fourth problem, when a large-diameter metal wire is bonded to a connection terminal of a silicon (Si) chip having an aluminum (Al) vapor-deposited film, heat is generated during operation. As a result, thermal strain is generated between the metal wire and the silicon (Si) chip, and a crack due to thermal fatigue grows at the joint, which eventually leads to destruction. This crack is mainly generated due to a large difference in thermal expansion between the wire and the connection substrate, and a long joint portion between the two.

【００１３】そして、これらの課題は、前記従来のボン
ディング手段及び前記開示によるボンディング手段のい
ずれにおいても、何等、考慮が払われていなかったこと
である。[0013] These problems are that no consideration is given to any of the conventional bonding means and the bonding means according to the disclosure.

【００１４】本発明は、前記各課題を解決するために案
出されたもので、その目的は、ボンディング時にボンデ
ィング領域や金属ワイヤに何等損傷を与えず、ボンディ
ング後に接合不良を発生させないボンディング方法及び
ボンディング構造を提供することにある。The present invention has been devised to solve the above-mentioned problems, and has as its object to provide a bonding method which does not cause any damage to a bonding area or a metal wire at the time of bonding and does not cause a bonding failure after bonding. It is to provide a bonding structure.

【００１５】[0015]

【課題を解決するための手段】前記目的を達成するため
に、本発明は、ボンディングツ−ルを用い、ボンディン
グ領域にボール部を圧着した後、そのボール部の表面を
平坦にして形成したバンプに金属ワイヤを加圧ボンディ
ングするボンディング方法において、前記バンプの材質
は、前記金属ワイヤの硬度に略等しいかそれよりも低い
硬度を有するものが選ばれ、前記表面を平坦にしたバン
プは、前記金属ワイヤの直径よりも大きな直径を有する
ような形状に形成され、前記金属ワイヤは、ボンディン
グ部分が超音波加圧ボンディングによって前記バンプの
平坦な表面に埋め込まれる第１の手段を備える。In order to achieve the above object, the present invention relates to a bump formed by bonding a ball portion to a bonding area by using a bonding tool and flattening the surface of the ball portion. In a bonding method of pressure bonding a metal wire, the material of the bump is selected to have a hardness substantially equal to or lower than the hardness of the metal wire, and the bump having a flat surface is formed of the metal. Formed to have a diameter greater than the diameter of the wire, the metal wire comprises first means in which the bonding portion is embedded in the flat surface of the bump by ultrasonic pressure bonding.

【００１６】また、前記目的の達成のために、本発明
は、ボンディングツ−ルを用い、ボンディング領域にボ
ール部を圧着した後、そのボール部の表面を処理して形
成したバンプの表面に第２の金属ワイヤを加圧ボンディ
ングするボンディング方法において、前記バンプの材質
は、前記ボンディング領域の導電材質との間で金属間化
合物を形成しないか金属間化合物の成長が遅いものが選
ばれ、前記バンプは、第２の金属ワイヤとの接合面の整
形加工を行い、次いで、その接合面に蒸発除去、物理的
なエッチング除去、機械的な擦り付けのいずれかの手段
を用いてクリ−ニングし、ボンディングツ−ルを用いて
前記クリ−ニングした接合面に前記金属ワイヤに連結さ
れた第２のバンプを加圧ボンディングさせる第２の手段
を備える。Further, in order to achieve the above object, the present invention provides a method for bonding a ball portion to a bonding area using a bonding tool, and then treating the surface of the ball portion with a bump. In the bonding method of press-bonding the metal wire of No. 2, the material of the bump is selected so as not to form an intermetallic compound with the conductive material of the bonding region or to grow the intermetallic compound slowly. Performs a shaping process on a bonding surface with a second metal wire, and then cleans and bonds the bonding surface by any of evaporation removal, physical etching removal, and mechanical rubbing. Second means for pressure bonding a second bump connected to the metal wire to the cleaned bonding surface using a tool.

【００１７】さらに、前記目的の達成のために、本発明
は、導電材質からなるボンディング領域と、前記ボンデ
ィング領域上に圧着され、表面が平坦にされたバンプ
と、前記バンプの平坦な表面に超音波加圧ボンディング
された金属ワイヤとからなるボンディング構造におい
て、前記バンプの材質は、前記ボンディング領域の導電
材質及び前記金属ワイヤの材質に略等しいかまたはそれ
よりも低い硬度のものからなり、かつ、前記金属ワイヤ
は、ボンディング部分の大部分が前記バンプの中に埋め
込まれている第３の手段を備える。Further, in order to achieve the above object, the present invention provides a bonding region made of a conductive material, a bump pressed on the bonding region and having a flat surface, and an ultra-bump formed on the flat surface of the bump. In a bonding structure consisting of a metal wire subjected to sonic pressure bonding, the material of the bump is made of a material having a hardness substantially equal to or lower than the conductive material of the bonding region and the material of the metal wire, and The metal wire includes third means in which a majority of the bonding portion is embedded in the bump.

【００１８】この他にも、前記目的の達成のために、本
発明は、導電材質からなるボンディング領域と、前記ボ
ンディング領域上に圧着され、表面が平坦かつ清浄化に
された第１のバンプと、前記バンプの平坦な清浄化表面
に金属ワイヤに連結された第２のバンプを加圧ボンディ
ングされてなるボンディング構造において、前記バンプ
の材質は、前記ボンディング領域の導電材質との間で金
属間化合物を形成しないか金属間化合物の成長が遅いも
のが選ばれ、かつ、前記第１のバンプの清浄化された接
合面のほぼ全域に前記第２のバンプの接合面が接合され
ている第４の手段を備える。In addition, in order to achieve the above object, the present invention provides a bonding region made of a conductive material, and a first bump which is pressed on the bonding region and has a flat and clean surface. In a bonding structure in which a second bump connected to a metal wire is pressure-bonded to a flat cleaning surface of the bump, the material of the bump is an intermetallic compound between the bump and a conductive material of the bonding region. Or the fourth bump in which the bonding surface of the second bump is bonded to almost the entire cleaned bonding surface of the first bump. Means.

【００１９】[0019]

【作用】前記第１の手段においては、ボンディング領域
にボール部を圧着し、そのボール部の表面を平坦にして
形成したバンプに金属ワイヤを加圧ボンディングするに
際して、バンプの材質として金属ワイヤの硬度に略等し
いかそれよりも低い硬度を有するものを選び、表面を平
坦にしたバンプを金属ワイヤの直径よりも大きな直径と
大きな厚みを有する形状に形成し、金属ワイヤのボンデ
ィング部分を常温による超音波加圧ボンディングによっ
てバンプの平坦な表面に埋め込むようにした方法、即
ち、ボンディング領域に、予めワイヤボンディング手段
を用いて金属ワイヤに等しいかそれよりも低い硬度を有
する大型、厚肉のバンプを形成し、そのバンプ上に金属
ワイヤをボンディングするボンディング方法を用いてい
る。In the first means, when a ball is pressed against a bonding area and a metal wire is pressure-bonded to a bump formed by flattening the surface of the ball, the hardness of the metal wire is used as the material of the bump. Select a bump that has a hardness approximately equal to or lower than that of the metal wire, form a bump with a flattened surface into a shape with a diameter and a thickness that is larger than the diameter of the metal wire, and bond the metal wire with ultrasonic waves at room temperature. A method of embedding a flat surface of a bump by pressure bonding, that is, forming a large, thick bump having a hardness equal to or lower than that of a metal wire in advance in a bonding area using a wire bonding means. And a bonding method of bonding a metal wire on the bump.

【００２０】この第１の手段によれば、バンプの材質と
して、金属ワイヤに等しいかそれよりも低い硬度のもの
を選んでいるので、ボ−ルボンディングにより形成され
るバンプは、肉厚が数１０乃至数１００μｍのものが容
易に得られ、その材質もワイヤに加工できる金属であれ
ばいずれのものも選択できて、ボンディング領域の材質
と金属ワイヤ材質との多くの組合せが可能になる。そし
て、このバンプに金属ワイヤを常温による超音波加圧ボ
ンディングしているので、バンプの変形により金属ワイ
ヤがバンプに埋め込まれるた状態で接合され、しかも、
金属ワイヤを変形させることなくそれらの接触面積、即
ち、接合率を増大させることができる。さらに、バンプ
の変形が大きいために、バンプ側の清浄面が確実かつ容
易に得られる。その他に、このバンプは、厚肉状態に形
成されるため、ボ−ルバンプからボンディング領域に加
わる集中荷重や超音波振動によって発生する歪がバンプ
内で分散緩和され、ボンディング領域の下地の損傷を大
幅に低減できる。このように、前記第１の課題である金
属ワイヤにおけるワイヤネック部の強度の低下やボンデ
ィング領域の下地のダメ−ジの発生を未然に防ぐことが
可能になる。According to the first means, since the material of the bump is selected to have a hardness equal to or lower than that of the metal wire, the bump formed by ball bonding has a thickness of several tens. A material having a thickness of 10 to several hundreds μm can be easily obtained, and any material can be selected as long as it can be processed into a wire, and many combinations of the material of the bonding region and the material of the metal wire become possible. And since the metal wire is bonded to the bump by ultrasonic pressure bonding at room temperature, the metal wire is bonded in a state of being embedded in the bump due to the deformation of the bump.
The contact area, that is, the joining ratio, can be increased without deforming the metal wires. Furthermore, since the deformation of the bump is large, a clean surface on the bump side can be obtained reliably and easily. In addition, since the bumps are formed in a thick state, the strain caused by the concentrated load and ultrasonic vibration applied from the ball bumps to the bonding area is dispersed and alleviated in the bumps, and the damage to the base of the bonding area is greatly reduced. Can be reduced to As described above, it is possible to prevent the first problem, that is, the reduction in the strength of the wire neck portion of the metal wire and the occurrence of damage to the base of the bonding region.

【００２１】また、第１の手段において、バンプ材質と
して、金属ワイヤ、例えば、アルミニウム（Ａｌ）との
間で脆い金属間化合物を形成しない金属を選択し、その
金属のバンプをボ−ルボンディング手段によりボンディ
ング領域に圧着させれば、接合面に脆い金属間化合物が
形成されることがなく、前記第２の課題である異種金属
接合界面に成長する金属間化合物に基づく接合部の強度
低下を防げる。In the first means, a metal which does not form a brittle intermetallic compound with a metal wire, for example, aluminum (Al) is selected as a material of the bump, and the bump of the metal is formed by a ball bonding means. When a pressure is applied to the bonding region, a brittle intermetallic compound is not formed on the bonding surface, and the second problem, that is, a reduction in the strength of the bonded portion based on the intermetallic compound that grows at the dissimilar metal bonding interface can be prevented .

【００２２】さらに、第１の手段において、バンプ材質
として金属ワイヤよりも硬度の低い金属として、特に、
前記金属として材料入手直後の表面が清浄な酸化しない
金（Ａｕ）を選び、その金（Ａｕ）のバンプの形成後、
迅速に金属ワイヤをボンディングさせれば、接合部に接
合不良を生じないボンディングが可能になり、特に、前
述のように厚肉状態に形成したバンプに金属ワイヤをボ
ンディングする際のバンプの大きな変形による清浄面の
形成と相俟って、接合部における接合不良の発生を防止
でき、前記第３の課題である非めっきリ−ドや配線基板
における接合不良の発生を防げる。Further, in the first means, as a material having a lower hardness than the metal wire as the bump material,
As the metal, gold (Au) whose surface immediately after obtaining the material is not oxidized is selected, and after the formation of the gold (Au) bump,
If the metal wire is quickly bonded, it is possible to perform bonding without causing a joint failure at the bonding portion, particularly due to a large deformation of the bump when bonding the metal wire to the bump formed in a thick state as described above. In conjunction with the formation of the clean surface, it is possible to prevent the occurrence of a bonding defect at the bonding portion, and to prevent the third problem of the non-plating lead or the bonding defect at the wiring board.

【００２３】この他に、第１の手段において、バンプ材
質として、熱膨張係数がボンディング領域の形成材質と
金属ワイヤの形成材質の中間にある金属を選択すれば、
ボンディング領域と金属ワイヤとの間に生じる熱歪を小
さくでき、接合部の疲労寿命を延ばすことができる。さ
らに、金属ワイヤとボンディング領域との間の熱歪も、
それらの中間にあるバンプによって緩和され、金属ワイ
ヤとバンプとの間に発生する熱疲労破壊を防ぐことがで
き、前記第４の課題である金属ワイヤとボンディング領
域との間の熱疲労破壊の発生を低減させることが可能に
なる。In addition, in the first means, if a metal having a coefficient of thermal expansion intermediate between the material for forming the bonding region and the material for forming the metal wire is selected as the bump material,
Thermal strain generated between the bonding region and the metal wire can be reduced, and the fatigue life of the joint can be extended. In addition, the thermal strain between the metal wire and the bonding area also
It is possible to prevent thermal fatigue destruction occurring between the metal wires and the bumps, which is alleviated by the bumps in between them, and the fourth problem is the occurrence of thermal fatigue destruction between the metal wires and the bonding region. Can be reduced.

【００２４】次に、前記第２の手段においては、ボンデ
ィング領域にボール部を圧着した後、そのボール部を変
形してバンプを形成し、そのバンプの接合面に金属ワイ
ヤを加圧ボンディングするに際して、バンプの材質とし
て、ボンディング領域の導電材質との間で金属間化合物
を形成しないか金属間化合物の成長が遅いものが選ば
れ、しかも、バンプの金属ワイヤとの接合面は、整形加
工の後でクリ−ニングを行ない、ボンディングツ−ルを
用いてこのクリ−ニングしたバンプの接合面に金属ワイ
ヤに連結された第２のバンプを加圧ボンディングする方
法、即ち、ボンディング領域に、予めワイヤボンディン
グ手段を用いて金属ワイヤと間で脆い金属間化合物を形
成しない金属あるいはその形成の遅い金属によるバンプ
を形成し、そのバンプにおける金属ワイヤとの接合面を
処理した後、この接合面に金属ワイヤを連結した第２の
バンプをボンディングするボンディング方法を用いてい
る。[0024] Next, in the second means, after a ball portion is press-bonded to a bonding area, the ball portion is deformed to form a bump, and a metal wire is pressure-bonded to a bonding surface of the bump. As the material of the bump, a material that does not form an intermetallic compound with the conductive material of the bonding region or that has a slow growth of the intermetallic compound is selected, and the bonding surface of the bump with the metal wire is formed after shaping. And bonding the second bump connected to the metal wire to the bonding surface of the cleaned bump using a bonding tool under pressure, that is, wire bonding in advance in the bonding area. Forming a bump made of a metal that does not form a brittle intermetallic compound with a metal wire or a metal that forms the bump slowly, After processing the interface between the metal wires in, and using the bonding method of bonding a second bump connecting the metal wires to the bonding surface.

【００２５】前記第２の手段によれば、バンプの材質と
して、ボンディング領域の導電材質との間で脆い金属間
化合物を形成しない金属あるいはその形成が遅い金属を
選んでいるので、ボンディング領域とバンプとの間には
脆い金属間化合物が形成される率がきわめて少なくな
り、それら接合部間の強度低下を生じることがなくな
る。また、バンプの金属ワイヤとの接合面は、整形加工
やクリーニング等の処理が行われた後、第２のバンプが
ボンディングされるので、バンプと第２のバンプ（金属
ワイヤ）との間の接合が確実に行われ、それらの間の接
合不良の発生もきわめて少なくなる。According to the second means, as the material of the bump, a metal which does not form a brittle intermetallic compound with the conductive material of the bonding region or a metal whose formation is slow is selected. The rate at which brittle intermetallic compounds are formed is extremely low, and the strength between the joints does not decrease. In addition, since the bonding surface of the bump with the metal wire is subjected to a process such as shaping or cleaning, the second bump is bonded, so that the bonding between the bump and the second bump (metal wire) is performed. Is reliably performed, and the occurrence of poor bonding therebetween is extremely reduced.

【００２６】さらに、前記第３の手段においては、導電
材質からなるボンディング領域と、ボンディング領域上
に圧着され、表面が平坦なバンプと、バンプの平坦な表
面に超音波加圧ボンディングされた金属ワイヤとからな
るボンディング構造を得るに際して、バンプの材質とし
てボンディング領域の導電材質及び金属ワイヤの材質に
略等しいかまたはそれよりも低い硬度のものを用い、金
属ワイヤのボンディング部分の大部分をバンプの中に埋
め込んだ形状にしている。Further, in the third means, a bonding region made of a conductive material, a bump having a flat surface, and a metal wire bonded to the flat surface of the bump by ultrasonic pressure bonding. In order to obtain a bonding structure comprising: a material having a hardness substantially equal to or lower than that of the conductive material of the bonding region and the material of the metal wire as the material of the bump, most of the bonding portion of the metal wire is formed in the bump. It is embedded in the shape.

【００２７】前記第３の手段によれば、バンプの材質と
して、ボンディング領域の導電材質及び金属ワイヤに等
しいかそれよりも低い硬度を有するものを選び、かつ、
金属ワイヤがバンプに埋め込まれた状態で接合されてい
るので、前記第１の手段で述べたと同様に、金属ワイヤ
の変形がなく、バンプとの接触面積、即ち、接触率を増
大させたボンディング構造が得られるだけでなく、バン
プを厚肉状態に形成したことにより、ボンディング領域
の下地の損傷を低減させたボンディング構造が得られ
る。According to the third means, as the material of the bump, a material having a hardness equal to or lower than the conductive material of the bonding area and the metal wire is selected, and
Since the metal wires are bonded in a state of being embedded in the bumps, as described in the first means, there is no deformation of the metal wires and a contact area with the bumps, that is, a bonding structure in which the contact ratio is increased. In addition to the above, a bonding structure in which the damage to the base of the bonding area is reduced by forming the bumps in a thick state can be obtained.

【００２８】また、前記第４の手段においては、導電材
質からなるボンディング領域と、ボンディング領域上に
圧着され、接合面を清浄化したバンプと、このバンプの
清浄化した接合面に加圧ボンディングされた金属ワイヤ
に連なる第２のバンプとからなるボンディング構造を得
るに際して、バンプの材質としてボンディング領域の導
電材質との間で脆い金属間化合物を形成しない金属ある
いはその形成が遅い金属が選ばれ、しかも、バンプの清
浄化された接合面のほぼ全域に第２のバンプの接合面が
接合された状態に形状になっている。Further, in the fourth means, a bonding region made of a conductive material, a bump which is pressed onto the bonding region and has a cleaned bonding surface, and a pressure bonding is performed on the cleaned bonding surface of the bump. When obtaining a bonding structure consisting of a second bump connected to a metal wire, a metal that does not form a brittle intermetallic compound with the conductive material of the bonding region or a metal whose formation is slow is selected as the material of the bump, and The shape is such that the bonding surface of the second bump is bonded to almost the entire area of the cleaned bonding surface of the bump.

【００２９】前記第４の手段によれば、バンプの材質と
してボンディング領域の導電材質との間で脆い金属間化
合物を形成しないか金属間化合物の成長が遅いものが選
ばれ、しかも、バンプの清浄化された接合面のほぼ全域
に第２のバンプの接合面が接合されているので、前記第
２の手段で述べたと同様に、ボンディング領域とバンプ
との接合部に脆い金属間化合物が形成されることがな
く、前記接合部の高温時の信頼性を大幅に向上させたボ
ンディング構造が得られるだけでなく、バンプと第２の
バンプ（金属ワイヤ）との接合不良を大幅に低減させた
ボンディング構造が得られる。この場合、バンプの材質
として、ボンディング領域との間に脆い金属間化合物が
形成され難い金属として、プラチナ（Ｐｔ）やニッケル
（Ｎｉ）等の金属を選択すれば、製品コストはやや上昇
するものの、前記接合部の高温時の信頼性を飛躍的に向
上させたボンディング構造が得られる。According to the fourth means, a material which does not form a brittle intermetallic compound with the conductive material of the bonding region or whose growth is slow is selected as the material of the bump. Since the bonding surface of the second bump is bonded to almost the entire region of the bonded bonding surface, a brittle intermetallic compound is formed at the bonding portion between the bonding region and the bump in the same manner as described in the second means. Not only can provide a bonding structure in which the reliability of the bonding portion at high temperatures is greatly improved, but also significantly reduce bonding defects between the bump and the second bump (metal wire). The structure is obtained. In this case, if a metal such as platinum (Pt) or nickel (Ni) is selected as a material of the bump and a metal in which a brittle intermetallic compound is unlikely to be formed with the bonding region, the product cost is slightly increased, It is possible to obtain a bonding structure in which the reliability of the junction at a high temperature is dramatically improved.

【００３０】[0030]

【実施例】以下、本発明の実施例を図面を用いて詳細に
説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.

【００３１】図１（ａ）乃至（ｅ）は、本発明に係わる
ボンディング方法の第１の実施例を示す工程図であり、
その中で、図１（ｅ）は図１（ｄ）に示すＡ−Ａ’線部
分の断面図である。FIGS. 1A to 1E are process diagrams showing a first embodiment of the bonding method according to the present invention.
1 (e) is a cross-sectional view taken along the line AA 'shown in FIG. 1 (d).

【００３２】図１（ａ）乃至（ｅ）において、１は接続
端子、２は端子基板、３は第１の金属ワイヤ（バンプ形
成用ワイヤ）、４はボ−ル部、５はキャピラリタイプの
ボンディングツ−ル、６は切断部、７はバンプ、８は端
面が平坦な治具、９は超音波、１０は第２の金属ワイヤ
（配線リード用ワイヤ）、１１はウェッジボンディング
ツ−ルである。1 (a) to 1 (e), reference numeral 1 denotes a connection terminal, 2 denotes a terminal substrate, 3 denotes a first metal wire (bump forming wire), 4 denotes a ball portion, and 5 denotes a capillary type. A bonding tool, 6 is a cut portion, 7 is a bump, 8 is a jig having a flat end face, 9 is an ultrasonic wave, 10 is a second metal wire (wire for wiring lead), and 11 is a wedge bonding tool. is there.

【００３３】そして、端子基板２は、接続端子１の下地
になるもので、接続端子１と端子基板２とによってボン
ディング領域が構成される。第１の金属ワイヤ３は、ボ
ンディングツ−ル５の細孔部に挿通保持され、第１の金
属ワイヤ３の先端を加熱することにより、そこにボ−ル
部４が形成される。切断部６は、第１の金属ワイヤ３と
ボ−ル部４との間に設けられるもので、端面が平坦な治
具８は、ボ−ル部４を押圧することにより表面の平坦な
バンプ７を形成させる。ウェッジボンディングツ−ル１
１は、先端に滑り止め加工が施され、バンプ７内に第２
の金属ワイヤ１０を埋め込ませる。超音波９は、端面が
平坦な治具８がボ−ル部４を押圧する際及びウェッジボ
ンディングツ−ル１１がバンプ７を押圧する際に、ボ−
ル部４及びバンプ７に加えられる。The terminal substrate 2 serves as a base of the connection terminal 1, and the connection terminal 1 and the terminal substrate 2 form a bonding area. The first metal wire 3 is inserted and held in the pores of the bonding tool 5, and the tip of the first metal wire 3 is heated to form the ball portion 4 there. The cutting portion 6 is provided between the first metal wire 3 and the ball portion 4. The jig 8 having a flat end face is pressed by pressing the ball portion 4 to form a flat bump. 7 is formed. Wedge bonding tool 1
1 is a non-slip process at the tip and a second
Is embedded. The ultrasonic wave 9 is applied when the jig 8 having a flat end face presses the ball portion 4 and when the wedge bonding tool 11 presses the bump 7.
To the bumps 4 and the bumps 7.

【００３４】前記構成における第１の実施例に係わるボ
ンディング方法は、以下の各工程を経て、所定のボンデ
ィングが行われる。In the bonding method according to the first embodiment having the above structure, predetermined bonding is performed through the following steps.

【００３５】始めに、図１（ａ）に示されるように、端
子基板２に設けられた接続端子１上に、ボンディングツ
−ル５の細孔部に挿通保持した第１の金属ワイヤ（バン
プ形成用ワイヤ）３の先端部を加熱し、その加熱によっ
て形成したボ−ル部４を載置させ、このボ−ル部４を接
続端子１に熱圧着させるか、あるいは超音波併用熱圧着
させることにより、接続端子１上に圧着固定する。この
場合、第１の金属ワイヤ３の材質は、前記接続端子１の
導電材質及び第２の金属ワイヤ（配線リード用ワイヤ）
１０の材質の硬度に比べ、ほぼ等しいかあるいは低い硬
度を有するものが選択され、また、接続端子１上に圧着
固定されるボ−ル部４は、既知のこの種のワイヤボンデ
ィングによって圧着固定されるボール部に比べて大きな
径になるように形成される。First, as shown in FIG. 1 (a), a first metal wire (bump) inserted and held in a pore portion of a bonding tool 5 is provided on a connection terminal 1 provided on a terminal board 2. The distal end portion of the forming wire 3 is heated, and the ball portion 4 formed by the heating is placed thereon, and the ball portion 4 is thermocompression-bonded to the connection terminal 1 or thermocompression bonding with ultrasonic wave. Thereby, it is crimped and fixed on the connection terminal 1. In this case, the material of the first metal wire 3 is the conductive material of the connection terminal 1 and the second metal wire (wiring lead wire).
A material having a hardness approximately equal to or lower than the hardness of the material No. 10 is selected, and the ball portion 4 to be crimped and fixed on the connection terminal 1 is crimped and fixed by known wire bonding of this kind. It is formed so as to have a larger diameter than the ball portion.

【００３６】次に、図１（ｂ）に示されるように、ボン
ディングツ−ル５とともに第１の金属ワイヤ３を上側に
引き上げ、第１の金属ワイヤ３を強度的に弱いボ−ル部
４の付け根付近（切断部６）において破断させ、接続端
子１上に切断部６を有するボ−ル部４を圧着残留させ
る。Next, as shown in FIG. 1 (b), the first metal wire 3 is pulled upward together with the bonding tool 5, and the first metal wire 3 is weakened in ball portion 4 in strength. Is cut near the base (cut portion 6), and the ball portion 4 having the cut portion 6 on the connection terminal 1 is left by pressure bonding.

【００３７】続いて、図１（ｃ）に示されるように、下
部端面の平坦な治具８を用いて、切断部６を有するボ−
ル部４を上面から押圧し、平坦な表面のバンプ７になる
ように変形させる。このボ−ル部４の押圧時に、ボール
部４に超音波９及び／または熱を加えると、少ない押圧
荷重により平坦な表面のバンプ７を形成することができ
る。すなわち、かかる超音波９及び／または熱の印加を
併用した押圧を行えば、バンプ７に低硬度の材質を採用
したことと相俟って、端子基板２に対する応力が低減さ
れ、端子基板２の損傷を少なくできる。なお、この場合
においても、前記バンプ７は、既知のこの種のワイヤボ
ンディングによって形成されるバンプに比べて大きな径
を有し、かつ、第２の金属ワイヤ（配線リード用ワイ
ヤ）１０の直径よりも大きな厚みを有するような形状に
形成している。Subsequently, as shown in FIG. 1 (c), using a jig 8 having a flat lower end surface, a bod having a cut portion 6 is formed.
The pressing portion 4 is pressed from the upper surface and deformed so as to become the bump 7 having a flat surface. When ultrasonic waves 9 and / or heat are applied to the ball portion 4 when the ball portion 4 is pressed, the bump 7 having a flat surface can be formed with a small pressing load. That is, when the pressing is performed using the ultrasonic wave 9 and / or the application of heat in combination, the stress applied to the terminal board 2 is reduced in combination with the use of a low-hardness material for the bump 7, and Damage can be reduced. Also in this case, the bump 7 has a larger diameter than a bump formed by known wire bonding of this type, and has a larger diameter than the diameter of the second metal wire (wire for wiring lead) 10. Are formed in a shape having a large thickness.

【００３８】次いで、図１（ｄ）及び（ｅ）に示される
ように、平坦な表面のバンプ７の上側に第２の金属ワイ
ヤ（配線リード用ワイヤ）１０のボンディング部を載置
させ、その載置した第２の金属ワイヤ１０のボンディン
グ部の上に、端面に滑り防止処理を施したウェッジボン
ディングツ−ル１１を押し当て、同時に常温状態で超音
波９を印加しつつ、第２の金属ワイヤ１０のボンディン
グ部をバンプ７内に押し込む。この結果、ボンディング
後には、第２の金属ワイヤ１０は、それよりも軟らかな
バンプ７内に埋め込まれ、第２の金属ワイヤ１０が殆ん
ど変形されない状態でバンプ７との間に十分な接合面積
を持って結合され、接続端子１上にバンプ７を介した第
２の金属ワイヤ１０のボンディングが行われるものであ
る。Next, as shown in FIGS. 1D and 1E, a bonding portion of a second metal wire (wiring lead wire) 10 is placed on the flat surface of the bump 7 above the bump 7. A wedge bonding tool 11 having an anti-slip treatment applied to an end surface thereof is pressed onto a bonding portion of the placed second metal wire 10, while simultaneously applying ultrasonic waves 9 at normal temperature to the second metal wire 10. The bonding portion of the wire 10 is pushed into the bump 7. As a result, after bonding, the second metal wire 10 is embedded in the softer bump 7, and sufficient bonding between the second metal wire 10 and the bump 7 is performed in a state where the second metal wire 10 is hardly deformed. The bonding is performed with an area, and the bonding of the second metal wire 10 via the bump 7 on the connection terminal 1 is performed.

【００３９】前記ボンディング方法により得られたボン
ディング構造は、端子基板２の破損を殆んど生じない状
態で、接続端子１上に大径で、厚みの厚いバンプ７が圧
着固定されたもので、しかも、図１（ｅ）に示されるよ
うに、大径で、厚みの厚いバンプ７中に第２の金属ワイ
ヤ１０のボンディング部の殆んど全体が埋め込まれたも
のになっている。The bonding structure obtained by the above-described bonding method has a large-diameter and thick bump 7 fixedly mounted on the connection terminal 1 by crimping with little damage to the terminal substrate 2. In addition, as shown in FIG. 1E, almost the entire bonding portion of the second metal wire 10 is buried in the large-diameter and thick bump 7.

【００４０】ところで、本実施例のボンディング方法及
びボンディング構造においては、接続端子１、第１の金
属ワイヤ３（バンプ７）、第２の金属ワイヤ１０に用い
られる各材質としては、次に述べるような組合せのもの
を選択することが好ましい。By the way, in the bonding method and the bonding structure of this embodiment, the materials used for the connection terminal 1, the first metal wire 3 (bump 7), and the second metal wire 10 will be described below. It is preferable to select an appropriate combination.

【００４１】ただし、これらの組合せは、本発明を実施
する場合における好適な材質の組合せを示すものではあ
るが、本発明は、それら組合せに用いられる材質ものに
限定されるものではなく、各材質間に特性の変更を生じ
ない限り、他の材質を用いた組合せを採用できることは
勿論である。However, although these combinations indicate preferred combinations of materials in the case of carrying out the present invention, the present invention is not limited to the materials used for these combinations. As long as there is no change in the characteristics in between, it goes without saying that combinations using other materials can be adopted.

【００４２】まず、第１の組合せは、接続端子１の材質
がアルミニウム（Ａｌ）またはアルミニウム（Ａｌ）系
合金であるとき、第１の金属ワイヤ３（バンプ７）の材
質としてアルミニウム（Ａｌ）よりも硬度の低い純金
（Ａｕ）を選択する。次に、第２の組合せは、接続端子
１の導電材質が金（Ａｕ）または金（Ａｕ）系合金であ
るとき、第１の金属ワイヤ３（バンプ７）の材質として
金（Ａｕ）よりも硬度の低い純アルミニウム（Ａｌ）を
選択する。続く、第３の組合せは、接続端子１の材質が
銅（Ｃｕ）系または金（Ａｕ）系の金属あるいはそれら
の合金であるとき、第１の金属ワイヤ３（バンプ７）の
材質としてチタン（Ｔｉ）、ニオブ（Ｎｂ）、タンタル
（Ｔａ）、プラチナ（Ｐｔ）、パラジウム（Ｐｄ）、ニ
ッケル（Ｎｉ）のいずれかをベ−スとした金属あるいは
それらの合金を選択し、第２の金属ワイヤ１０の材質と
してアルミニウム（Ａｌ）を選択する。さらに、第４の
組合せは、接続端子１の材質がアルミニウム（Ａｌ）系
の金属あるいはその合金であるとき、第１の金属ワイヤ
３（バンプ７）の材質としてアルミニウム（Ａｌ）と金
属間化合物を形成しない金属あるいは２００℃以下の温
度下での２０００時間の保持時間により形成される金属
間化合物の厚さが０．５μｍ以下である金属、例えば、
錫（Ｓｎ）、ゲルマニウム（Ｇｅ）、あるいは、アルミ
ニウム（Ａｌ）化合物の成長速度が遅いチタン（Ｔ
ｉ）、ニオブ（Ｎｂ）、タンタル（Ｔａ）、プラチナ
（Ｐｔ）、パラジウム（Ｐｄ）、ニッケル（Ｎｉ）のい
ずれかをベ−スとする金属あるいはそれらの合金のいず
れかを選択し、第２の金属ワイヤ１０として金（Ａ
ｕ）、銀（Ａｇ）、銅（Ｃｕ）のいずれかを選択する。
続いで、第５の組合せは、接続端子１の材質がアルミニ
ウム（Ａｌ）系の金属あるいはその合金であるとき、第
１の金属ワイヤ３（バンプ７）の材質としてアルミニウ
ム（Ａｌ）あるいは金（Ａｕ）よりも降伏強度もしくは
ヤング率が低い金属またはその合金、例えば、錫（Ｓ
ｎ）、アルミニウム（Ａｌ）、金（Ａｕ）、ゲルマニウ
ム（Ｇｅ）のいずれかを選択し、第２の金属ワイヤ１０
としてアルミニウム（Ａｌ）、金（Ａｕ）のいずれかを
選択する。First, in the first combination, when the material of the connection terminal 1 is aluminum (Al) or an aluminum (Al) -based alloy, the material of the first metal wire 3 (bump 7) is made of aluminum (Al). Also, pure gold (Au) having a low hardness is selected. Next, in the second combination, when the conductive material of the connection terminal 1 is gold (Au) or a gold (Au) -based alloy, the material of the first metal wire 3 (bump 7) is more than gold (Au). Select pure aluminum (Al) with low hardness. Next, a third combination is that when the material of the connection terminal 1 is a copper (Cu) -based or gold (Au) -based metal or an alloy thereof, the first metal wire 3 (bump 7) is made of titanium (bump 7). A metal based on any one of Ti), niobium (Nb), tantalum (Ta), platinum (Pt), palladium (Pd) and nickel (Ni) or an alloy thereof, and a second metal wire Aluminum (Al) is selected as the material of No. 10. Further, in the fourth combination, when the material of the connection terminal 1 is an aluminum (Al) -based metal or an alloy thereof, aluminum (Al) and an intermetallic compound are used as the material of the first metal wire 3 (bump 7). Metals that do not form or metals whose intermetallic compounds formed by a holding time of 2000 hours at a temperature of 200 ° C. or less have a thickness of 0.5 μm or less, for example,
Tin (Tn), which has a slow growth rate of tin (Sn), germanium (Ge), or aluminum (Al) compound
i), a metal based on any one of niobium (Nb), tantalum (Ta), platinum (Pt), palladium (Pd) and nickel (Ni) or any of their alloys, Gold (A) as the metal wire 10
u), silver (Ag), or copper (Cu).
Subsequently, in a fifth combination, when the material of the connection terminal 1 is an aluminum (Al) -based metal or an alloy thereof, aluminum (Al) or gold (Au) is used as the material of the first metal wire 3 (bump 7). Metal or an alloy thereof having a lower yield strength or Young's modulus than
n), aluminum (Al), gold (Au), germanium (Ge), and the second metal wire 10
, Either aluminum (Al) or gold (Au) is selected.

【００４３】かかる本実施例のボンディング方法によれ
ば、次に挙げるような幾つかの特有な作用効果が期待で
きるものである。According to the bonding method of the present embodiment, several unique functions and effects as described below can be expected.

【００４４】．バンプ７の材質として、第２の金属ワ
イヤ１０に等しいかそれよりも低い硬度のものを選んで
いるので、ボ−ル部４の押圧により形成されるバンプ７
は、肉厚が数１０乃至数１００μｍのものを容易に形成
することができる。そして、バンプ７の材質も、ワイヤ
加工できる金属であり、かつ、前述の特性を有するもの
であれば種々のものが選択でき、接続端子１の形成材質
に対する、バンプ７の材質と第２の金属ワイヤ１０の材
質の選択も、同様に種々のものの選択が可能になる。[0044] Since a material having a hardness equal to or lower than that of the second metal wire 10 is selected as a material of the bump 7, the bump 7 formed by pressing the ball portion 4 is formed.
Can easily be formed with a thickness of several tens to several hundreds of micrometers. Also, the material of the bump 7 is a metal that can be processed by wire, and various materials can be selected as long as the material has the above-mentioned characteristics. Similarly, various materials can be selected for the material of the wire 10.

【００４５】．バンプ７と第２の金属ワイヤ１０との
接合には、常温による超音波加圧ボンディングを利用し
ているので、バンプ７の変形によって、第２の金属ワイ
ヤ１０がバンプ７内に埋め込まれるように接合され、第
２の金属ワイヤ１０を変形させずに、バンプ７との接触
面積を増大させることができる。また、バンプ７の変形
が大きいため、バンプ７側の清浄面を確実かつ容易に得
ることができ、第２の金属ワイヤ１０の変形が小さい状
態で、バンプ７との接合率を大きくできる。[0045] Since the bonding between the bump 7 and the second metal wire 10 uses ultrasonic pressure bonding at room temperature, the deformation of the bump 7 causes the second metal wire 10 to be embedded in the bump 7. The contact area with the bump 7 can be increased without deforming the bonded second metal wire 10. Further, since the deformation of the bump 7 is large, a clean surface on the side of the bump 7 can be reliably and easily obtained, and the bonding rate with the bump 7 can be increased while the deformation of the second metal wire 10 is small.

【００４６】．ボ−ル部４の押圧によって形成される
バンプ７は、大径、かつ、厚肉状態に形成されるもので
あるため、端子基板２に加わる集中荷重が軽減され、超
音波振動によって発生する歪もバンプ７内で分散緩和さ
れて、端子基板２に加わる応力が小さくなり、端子基板
２の損傷を低減できる。[0046] Since the bump 7 formed by pressing the ball portion 4 is formed in a large diameter and thick state, the concentrated load applied to the terminal substrate 2 is reduced, and the distortion generated by the ultrasonic vibration is generated. Also, the dispersion is alleviated in the bumps 7 and the stress applied to the terminal substrate 2 is reduced, so that damage to the terminal substrate 2 can be reduced.

【００４７】．バンプ７の材質として、第２の金属ワ
イヤ１０（配線リード用金属ワイヤで、例えば、アルミ
ニウム（Ａｌ）からなる）との間で脆い金属間化合物を
形成しない金属、例えば、錫（Ｓｎ）、ゲルマニウム
（Ｇｅ）等を選択し、このアルミニウム（Ａｌ）からな
る第２の金属ワイヤ１０のボンディング前に、前記金属
のバンプ７をボ−ルボンディング手段により形成させれ
ば、ボ−ルボンディング手段によるバンプ７の形成は、
既知の製造設備がそのまま用いられ、コストアップを最
小限に留めた状態で、異種金属接合界面に成長する脆い
金属間化合物に基づく接合部の強度低下が防げる。[0047] As a material of the bump 7, a metal that does not form a brittle intermetallic compound with the second metal wire 10 (metal wire for wiring lead and made of, for example, aluminum (Al)), for example, tin (Sn), germanium (Ge) or the like, and before bonding the second metal wire 10 made of aluminum (Al), the metal bump 7 is formed by ball bonding means. The formation of 7
A known manufacturing facility is used as it is, and it is possible to prevent a decrease in the strength of a joint based on a brittle intermetallic compound that grows at a dissimilar metal joint interface while minimizing cost increase.

【００４８】．バンプ７の材質として、材料入手直後
の表面が清浄な酸化しない金（Ａｕ）を選び、その金
（Ａｕ）のバンプ７を形成した後に、迅速に第２の金属
ワイヤ１０をボンディングさせれば、長期保管を行った
ものまたははんだ付け等の組立て工程を経たものと同様
のプロセスを用いて、接合部の接合不良を生じないボン
ディングが可能になり、その上に、前述のように厚肉状
態に形成したバンプ７に第２の金属ワイヤ１０をボンデ
ィングしているので、バンプ７の変形が大きく、それに
よりバンプ７の表面の汚れや酸化膜等が除去されて、簡
単かつ確実に清浄面が得られる機能と相俟って、接合部
における接合不良の発生を防止できる。[0048] As a material of the bump 7, gold (Au) whose surface immediately after obtaining the material is not oxidized is selected, and after the bump 7 of the gold (Au) is formed, the second metal wire 10 is quickly bonded. By using the same process as that that has been stored for a long time or that has undergone an assembly process such as soldering, bonding that does not cause joint failure can be performed, and on top of that, it becomes thick as described above Since the second metal wires 10 are bonded to the formed bumps 7, the bumps 7 are greatly deformed, thereby removing dirt and oxide films on the surfaces of the bumps 7 and easily and reliably obtaining a clean surface. Together with the function to be performed, it is possible to prevent the occurrence of defective bonding at the bonded portion.

【００４９】．バンプ７の材質として、熱膨張係数が
接続端子１の形成材質と第２の金属ワイヤ１０の形成材
質との中間の金属を選択すれば、接続端子１と第２の金
属ワイヤ１０との間に生じる大きな熱歪は、バンプ７に
より緩和されることになる。また、接続端子１とバンプ
７との間の接合部の接合面形状を真円に近い形状にすれ
ば、最短の接合部長により、最大の接合面積が得られ、
接合欠陥が少ない状態で接合部の疲労寿命を延ばすこと
ができ、かつ、バンプ７と第２の金属ワイヤ１０との間
に発生する熱疲労破壊が防げる。[0049] If a material having a thermal expansion coefficient intermediate between the material forming the connection terminal 1 and the material forming the second metal wire 10 is selected as the material of the bump 7, the material between the connection terminal 1 and the second metal wire 10 can be formed. The large thermal strain that occurs is alleviated by the bumps 7. Further, if the shape of the joint surface of the joint between the connection terminal 1 and the bump 7 is made to be a shape close to a perfect circle, a maximum joint area can be obtained due to the shortest joint length.
The fatigue life of the joint can be extended with few joint defects, and thermal fatigue destruction occurring between the bump 7 and the second metal wire 10 can be prevented.

【００５０】一方、本実施例によるボンディング構造に
よっても、次に挙げるような特有な作用効果が期待でき
るものである。On the other hand, with the bonding structure according to the present embodiment, the following specific effects can be expected.

【００５１】．バンプ７の材質として、接続端子１の
導電材質及び第２の金属ワイヤ１０の材質の硬度に等し
いかそれよりも低い硬度を有するものを選んでおり、か
つ、第２の金属ワイヤ１０がバンプ７に埋め込まれるよ
うな状態で接合されているので、前記ボンディング方法
で述べたと同様に、第２の金属ワイヤ１０の変形がな
く、バンプ７との接触面積が増大したボンディング構造
が得られる。[0051] As the material of the bump 7, a material having a hardness equal to or lower than the hardness of the conductive material of the connection terminal 1 and the material of the second metal wire 10 is selected, and the second metal wire 10 is As described in the above-described bonding method, the second metal wire 10 is not deformed, and a bonding structure in which the contact area with the bump 7 is increased can be obtained.

【００５２】．バンプ７の大きな変形により、バンプ
７側に清浄面を得た状態で、バンプ７と第２の金属ワイ
ヤ１０との間の接合部の接合率の大きなボンディング構
造が得られる。[0052] Due to the large deformation of the bump 7, a bonding structure having a large bonding ratio at the bonding portion between the bump 7 and the second metal wire 10 can be obtained in a state where a clean surface is obtained on the bump 7 side.

【００５３】．バンプ７を厚肉状態に形成したことに
より、ボンディング時に生じる端子基板２の損傷を低減
させボンディング構造が得られる。[0053] By forming the bumps 7 in a thick state, damage to the terminal substrate 2 caused during bonding is reduced, and a bonding structure is obtained.

【００５４】次に、図２は、図１に図示されたボンディ
ング方法を、薄膜磁気ヘッドの信号用リ−ド線の接続に
適用した際の接続状態を示す斜視図である。Next, FIG. 2 is a perspective view showing a connection state when the bonding method shown in FIG. 1 is applied to connection of a signal lead line of a thin-film magnetic head.

【００５５】図２において、１２はセラミック製のスラ
イダ−、１３は薄膜プロセスで形成した磁気センサ−、
１４−１は第１の信号端子、１４−２は第２の信号端
子、１４−３は第３の信号端子、１４−４は第４の信号
端子、１５−１は第１の信号端子１４−１に形成された
第１のバンプ、１５−２は第２の信号端子１４−２に形
成された第２のバンプ、１５−３は第３の信号端子１４
−３に形成された第３のバンプ、１５−４は第４の信号
端子１４−４に形成された第４のバンプ、１６−１は第
１の信号端子１４−１に取付けられる第１の被覆リ−ド
線、１６−２は第２の信号端子１４−２に取付けられる
第２の被覆リ−ド線、１７−１は第１の被覆リ−ド線１
６−１の内部導体、１７−２は第２の被覆リ−ド線１６
−２の内部導体、１８−１は第１の被覆リ−ド線１６−
１の被覆、１８−２は第２の被覆リ−ド線１６−２の被
覆である。In FIG. 2, 12 is a slider made of ceramic, 13 is a magnetic sensor formed by a thin film process,
14-1 is a first signal terminal, 14-2 is a second signal terminal, 14-3 is a third signal terminal, 14-4 is a fourth signal terminal, and 15-1 is a first signal terminal 14. -1, the first bump formed on the second signal terminal 14-2, and the third bump 15-3 formed on the third signal terminal 14-2.
-3, a third bump 15-4 formed on the fourth signal terminal 14-4, and 16-1 a first bump attached to the first signal terminal 14-1. A covered lead wire, 16-2 is a second covered lead wire attached to the second signal terminal 14-2, and 17-1 is a first covered lead wire 1.
Reference numeral 6-1 denotes an inner conductor, and reference numeral 17-2 denotes a second covered lead wire 16.
-2 inner conductor, 18-1 is the first coated lead wire 16-
Reference numeral 18-2 denotes a coating of the second coating lead wire 16-2.

【００５６】そして、スライダ−１２の上側には、第１
乃至第４の信号端子１４−１乃至１４−４が並置され、
第２の信号端子１４−２と第３の信号端子１４−３との
間に磁気センサ−１３が配置されている。この場合、第
１乃至第４の信号端子１４−１乃至１４−４は、薄膜プ
ロセスによって形成された金属の多層膜からなり、最表
面に金（Ａｕ）の膜が設けられる。第１乃至第４の信号
端子１４−１乃至１４−４上には、それぞれ第１乃至第
４のバンプ１５−１乃至１５−４が固着され、第１のバ
ンプ１５−１及び第２のバンプ１５−２上に、それぞれ
第１の被覆リ−ド線１６−１及び第２の被覆リ−ド線１
６−２の各内部導体１７−１、１７−２が接合されてい
る。Then, on the upper side of the slider 12, the first
To fourth signal terminals 14-1 to 14-4 are juxtaposed,
The magnetic sensor 13 is disposed between the second signal terminal 14-2 and the third signal terminal 14-3. In this case, the first to fourth signal terminals 14-1 to 14-4 are formed of a metal multilayer film formed by a thin film process, and a gold (Au) film is provided on the outermost surface. First to fourth bumps 15-1 to 15-4 are fixed on the first to fourth signal terminals 14-1 to 14-4, respectively, and the first and second bumps 15-1 and 15-4 are fixed. 15-2, a first coated lead wire 16-1 and a second coated lead wire 1 respectively.
Each of the 6-2 internal conductors 17-1 and 17-2 is joined.

【００５７】前記構成において、薄膜磁気ヘッドに信号
用リ−ド線を接続する際の順序は、次のとおりである。In the above configuration, the sequence of connecting the signal lead lines to the thin-film magnetic head is as follows.

【００５８】始めに、ボンディングツ−ル（図示なし）
に金（Ａｕ）からなる第１の金属ワイヤを装着させ、第
１乃至第４の信号端子１４−１乃至１４−４の上に、１
００℃以下の低温度で各別にボ−ルボンディングを行
い、それぞれボール部を形成固着させる。次いで、ボン
ディングツ−ルとともに第１の金属ワイヤを引き上げ、
第１の金属ワイヤからボール部を切断除去し、第１乃至
第４のバンプ１５−１乃至１５−４を形成させる。この
ボンディングに当って、第１乃至第４の信号端子１４−
１乃至１４−４の接合面を、レ−ザ、プラズマ、イオン
ビ−ムのいずれかを用いるか、あるいは機械的な手段を
用いるかしたクリ−ニングを行い、その後で、ボ−ル部
に超音波を加えながら荷重を加え、ボ−ル部を第１乃至
第４の信号端子１４−１乃至１４−４の接合面に接合さ
せている。なお、ボ−ル部の寸法は、接合された後の第
１乃至第４のバンプ１５−１乃至１５−４の直径が対応
する第１乃至第４の信号端子１４−１乃至１４−４上に
収まるぎりぎりの大きさになるように設定する。続い
て、第１乃至第４のバンプ１５−１乃至１５−４の上
に、第１の被覆リ−ド線１６−１及び第２の被覆リ−ド
線１６−２の各被覆１８−１、１８−２を除去すること
により露出させた内部導体１７−１、１７−２を、位置
決めした後横向きなるように載置させ、この内部導体１
７−１、１７−２の上からウェッジボンディングツ−ル
を所定の荷重で押し付け、常温下において超音波を加え
ながら第１及び第２のバンプ１５−１、１５−２と内部
導体１７−１、１７−２とを接合したものである。First, a bonding tool (not shown)
A first metal wire made of gold (Au) is mounted on the first and fourth signal terminals 14-1 to 14-4.
Ball bonding is performed separately at a low temperature of 00 ° C. or less to form and fix a ball portion. Next, the first metal wire is pulled up together with the bonding tool,
The ball portion is cut off from the first metal wire to form first to fourth bumps 15-1 to 15-4. In this bonding, the first to fourth signal terminals 14-
The bonding surfaces 1 to 14-4 are cleaned by using any of laser, plasma, and ion beam or by using a mechanical means. A load is applied while applying sound waves, and the ball portion is joined to the joining surfaces of the first to fourth signal terminals 14-1 to 14-4. The dimensions of the ball portion are on the first to fourth signal terminals 14-1 to 14-4 corresponding to the diameters of the first to fourth bumps 15-1 to 15-4 after bonding. Set so that it is just the size that fits in. Subsequently, on the first to fourth bumps 15-1 to 15-4, the respective coatings 18-1 of the first coating lead wire 16-1 and the second coating lead wire 16-2. , 18-2 are removed, and the inner conductors 17-1 and 17-2 exposed are placed sideways after positioning.
A wedge bonding tool is pressed from above 7-1 and 17-2 with a predetermined load, and the first and second bumps 15-1 and 15-2 and the inner conductor 17-1 are applied at room temperature while applying ultrasonic waves. , 17-2.

【００５９】本例のボンディング方法によれば、初期時
に、第１乃至第４の信号端子１４−１乃至１４−４に予
め最適な条件でボ−ルボンドによる第１乃至第４のバン
プ１５−１乃至１５−４を形成しているので、第１乃至
第４のバンプ１５−１乃至１５−４を形成する際の接合
ダメ−ジを防ぎながら、第１乃至第４のバンプ１５−１
乃至１５−４と第１乃至第４の信号端子１４−１乃至１
４−４との接合強度を十分高くすることができ、数１０
μｍ程度の厚さの金（Ａｕ）の第１乃至第４のバンプ１
５−１乃至１５−４を低コストの量産プロセスにより簡
単に形成することができる。According to the bonding method of this embodiment, at the initial stage, the first to fourth bumps 15-1 are formed on the first to fourth signal terminals 14-1 to 14-4 by ball bonding under optimum conditions in advance. Since the first to fourth bumps 15-1 to 15-4 are formed, the first to fourth bumps 15-1 to 15-4 can be prevented from being damaged during the formation of the first to fourth bumps 15-1 to 15-4.
To 15-4 and the first to fourth signal terminals 14-1 to 14-1
4-4, the bonding strength can be increased sufficiently.
First to fourth bumps 1 of gold (Au) having a thickness of about μm
5-1 to 15-4 can be easily formed by a low-cost mass production process.

【００６０】また、本例のボンディング方法によれば、
これら第１及び第２のバンプ１５−１、１５−２の上
に、第１の被覆リ−ド線１６−１及び第２の被覆リ−ド
線１６−２の内部導体１７−１、１７−２をウェッジボ
ンディングしているので、第１及び第２のバンプ１５−
１、１５−２を大きく変形させ、内部導体１７−１、１
７−２の変形を小さくした状態で接合でき、内部導体１
７−１、１７−２のネック強度の低下を防ぐことが可能
になる。According to the bonding method of this embodiment,
On these first and second bumps 15-1 and 15-2, the inner conductors 17-1 and 17-1 of the first covered lead line 16-1 and the second covered lead line 16-2 are placed. 2 is wedge bonded, so that the first and second bumps 15-
1, 15-2 are greatly deformed, and the inner conductors 17-1, 1
7-2 can be joined with the deformation reduced, and the inner conductor 1
It is possible to prevent the neck strength of 7-1 and 17-2 from decreasing.

【００６１】一般には、薄膜磁気ヘッドに用いるリ−ド
は、線径が５０μｍ以下、とりわけ３０乃至２０μｍと
細くなる傾向にあるが、本例のボンディング方法を用い
れば、前記接合強度をワイヤ強度の８０％以上に引き上
げることが可能になり、組立て時のハンドリングによる
断線を低減させ、組立て時の歩留まりの大幅な向上を図
ることが可能になる。In general, leads used in thin-film magnetic heads have a wire diameter of 50 μm or less, particularly 30 to 20 μm. However, if the bonding method of this example is used, the bonding strength is reduced to the wire strength. It is possible to raise the pressure to 80% or more, to reduce disconnection due to handling during assembly, and to greatly improve the yield during assembly.

【００６２】続いて、図３（ａ）乃至（ｆ）は、本発明
に係わるボンディング方法の第２の実施例を示す工程図
であって、半導体チップに対するリードワイヤの接続に
適用した例を示しているものである。FIGS. 3A to 3F are process diagrams showing a second embodiment of the bonding method according to the present invention, showing an example in which the present invention is applied to connection of lead wires to a semiconductor chip. Is what it is.

【００６３】図３（ａ）乃至（ｆ）において、１９は集
光レンズ、２０はレーザビーム、２１は第２の金属ワイ
ヤ、２２は第２のボール部、２３はボンディングツー
ル、２４は第２のバンプであり、その他、図１（ａ）乃
至（ｅ）に示された構成要素と同じ構成要素には同じ符
号を付けている。3 (a) to 3 (f), 19 is a condenser lens, 20 is a laser beam, 21 is a second metal wire, 22 is a second ball portion, 23 is a bonding tool, and 24 is a second And the same components as those shown in FIGS. 1A to 1E are denoted by the same reference numerals.

【００６４】そして、レーザビーム２０は、集光レンズ
１９により集束され、バンプ７の接合面（上面）に照射
される。第２の金属ワイヤ２１は、ボンディングツ−ル
２３の細孔部に挿通保持され、第２の金属ワイヤ２１の
先端を加熱することにより、そこに第２のボ−ル部２２
が形成される。このボ−ル部２２は、ボンディングツ−
ル２３の端面の押圧によって、第２のバンプ２４に変形
される。この場合、バンプ７の材質は、接続端子１の導
電材質との間で脆い金属間化合物を形成しない金属ある
いはその形成が遅い金属、具体的には、自動車用ＩＣに
おける安全率の基準である１７５℃以下の温度下で２０
００時間の保持時間を経ても金属間化合物の厚さが０．
５μｍ以下である金属を選択するようにしている。Then, the laser beam 20 is converged by the condenser lens 19 and applied to the bonding surface (upper surface) of the bump 7. The second metal wire 21 is inserted and held in the pore portion of the bonding tool 23, and by heating the tip of the second metal wire 21, the second ball portion 22 is inserted there.
Is formed. The ball portion 22 is provided with a bonding tool.
Due to the pressing of the end surface of the screw 23, it is deformed into the second bump 24. In this case, the material of the bump 7 is a metal that does not form a brittle intermetallic compound with the conductive material of the connection terminal 1 or a metal that forms slowly, specifically, 175, which is a standard of safety factor in an automobile IC. 20 ° C under temperature
Even after a holding time of 00 hours, the thickness of the intermetallic compound is 0.1 mm.
A metal having a size of 5 μm or less is selected.

【００６５】前記構成による第２の実施例に係わるボン
ディング方法は、以下の各工程を経て、所定のボンディ
ングが行われる。In the bonding method according to the second embodiment having the above configuration, predetermined bonding is performed through the following steps.

【００６６】始めに、図３（ａ）に示されるように、端
子基板２に設けた接続端子１上に、ボンディングツ−ル
５の細孔部に挿通保持した第１の金属ワイヤ３の先端部
を加熱し、その加熱によって形成したボ−ル部４を載置
させ、このボ−ル部４を接続端子１に熱圧着させるか、
あるいは超音波併用熱圧着させることにより、接続端子
１上に圧着固定する。この場合、端子基板２がアルミニ
ウム（Ａｌ）で構成されているときには、第１の金属ワ
イヤ３の材質は、アルミニウム（Ａｌ）と金属間化合物
を形成しない錫（Ｓｎ）合金もしくは２５０℃以下の温
度で金属間化合物の形成が遅いプラチナ（Ｐｔ）、ニッ
ケル（Ｎｉ）もしくはニオブ（Ｎｂ）等が選択され、第
２の金属ワイヤ２１の材質は、金（Ａｕ）が選択され
る。First, as shown in FIG. 3 (a), the tip of the first metal wire 3 inserted and held in the fine hole of the bonding tool 5 on the connection terminal 1 provided on the terminal board 2. The ball portion 4 is heated, the ball portion 4 formed by the heating is placed, and the ball portion 4 is thermocompressed to the connection terminal 1 or
Alternatively, it is crimped and fixed on the connection terminal 1 by thermocompression combined with ultrasonic waves. In this case, when the terminal board 2 is made of aluminum (Al), the material of the first metal wire 3 is a tin (Sn) alloy that does not form an intermetallic compound with aluminum (Al) or a temperature of 250 ° C. or less. In this case, platinum (Pt), nickel (Ni), niobium (Nb), or the like, whose formation of an intermetallic compound is slow is selected, and gold (Au) is selected as the material of the second metal wire 21.

【００６７】次に、図３（ｂ）に示されるように、ボン
ディングツ−ル５とともに第１の金属ワイヤ３を上側に
引き上げ、第１の金属ワイヤ３を強度的に弱いボ−ル部
４の付け根付近（切断部６）において破断させ、接続端
子１上に切断部６を有するボ−ル部４を圧着残留させ
る。Next, as shown in FIG. 3 (b), the first metal wire 3 is pulled upward together with the bonding tool 5, and the first metal wire 3 is weakened in ball portion 4 in strength. Is cut near the base (cut portion 6), and the ball portion 4 having the cut portion 6 on the connection terminal 1 is left by pressure bonding.

【００６８】続いて、図３（ｃ）に示されるように、下
部端面の平坦な治具８を用いて、切断部６を有するボ−
ル部４を上面から押圧し、同時にボ−ル部４に超音波９
を加えて平坦な接合面を持つ（第１の）バンプ７になる
ように変形させる。Subsequently, as shown in FIG. 3 (c), using a jig 8 having a flat lower end surface, a bod having a cut portion 6 is formed.
The ball part 4 is pressed from above, and simultaneously the ultrasonic wave 9 is applied to the ball part 4.
And deformed so as to become a (first) bump 7 having a flat joint surface.

【００６９】次いで、図３（ｄ）に示されるように、
（第１の）バンプ７の平坦な接合面に、集光レンズ１９
により集束されたレーザビーム２０を照射し、その平坦
な接合面をクリーニングして清浄化する。この際のクリ
−ニングとして、レーザビーム２０照射に代えて、プラ
ズマ照射、イオン照射または機械的研削等の手段を用い
てもよい。Next, as shown in FIG.
A condensing lens 19 is provided on the flat bonding surface of the (first) bump 7.
The laser beam 20 converged by the above is irradiated, and the flat joint surface is cleaned and cleaned. As the cleaning at this time, a means such as plasma irradiation, ion irradiation or mechanical grinding may be used instead of laser beam 20 irradiation.

【００７０】次に、図３（ｅ）に示されるように、ボン
ディングツ−ル２３の細孔部に挿通保持した第２の金属
ワイヤ２１、例えば、金（Ａｕ）のワイヤの先端部を加
熱し、その加熱によって形成した第２のボ−ル部２２を
（第１の）バンプ７の平坦な接合面上に載置させる。Next, as shown in FIG. 3E, the tip of the second metal wire 21, for example, a gold (Au) wire, inserted and held in the pores of the bonding tool 23, is heated. Then, the second ball portion 22 formed by the heating is placed on the flat bonding surface of the (first) bump 7.

【００７１】続いて、図３（ｆ）に示されるように、ボ
ンディングツ−ル２３の端面の平坦部を用い、第２のボ
−ル部２２を第２のバンプ２４に変換した後で、この第
２のボ−ル部２２を前記平坦な接合面に熱圧着させるか
あるいは超音波併用熱圧着させ、前記平坦な接合面上に
圧着固定する。Subsequently, as shown in FIG. 3F, after the second ball portion 22 is converted into the second bump 24 using the flat portion of the end surface of the bonding tool 23, The second ball portion 22 is thermocompression-bonded to the flat joint surface or thermocompression-bonded with ultrasonic waves, and is crimp-fixed on the flat joint surface.

【００７２】この第２の実施例は、半導体チップにおけ
るボンディング手段に用いて好適なものであるが、勿
論、半導体チップ以外の他の素子のボンディング手段に
用いることが可能である。Although the second embodiment is suitable for use as a bonding means in a semiconductor chip, it can, of course, be used for bonding other elements than the semiconductor chip.

【００７３】この第２の実施例によれば、第１の金属ワ
イヤ３の材質として、接続端子１の導電材質との間で脆
い金属間化合物を形成しないかその形成の速度が遅い金
属を選んでいるので、接続端子１と第１のバンプ４との
間には脆い金属間化合物が形成される確率がきわめて少
なく、それら接合部間の強度低下が生じない。また、第
１のバンプ４における第２のボール部２２との接合面
は、整形加工やクリーニング等の処理が行われた後、第
２のバンプ２４がボンディングされるので、第１のバン
プ４と第２のバンプ２４との間の接合が確実になり、そ
れらの間の接合不良の発生もきわめて少ない。According to the second embodiment, as the material of the first metal wire 3, a metal which does not form a brittle intermetallic compound with the conductive material of the connection terminal 1 or whose formation speed is slow is selected. Therefore, the probability that a brittle intermetallic compound is formed between the connection terminal 1 and the first bump 4 is extremely low, and the strength between the joints does not decrease. The surface of the first bump 4 to be bonded to the second ball portion 22 is subjected to a process such as shaping or cleaning, and then the second bump 24 is bonded. Bonding with the second bumps 24 is ensured, and bonding failure between them is extremely small.

【００７４】さらに、この第２の実施例を、半導体チッ
プのボンディング手段に用いれば、半導体チップにおけ
る既知の製造プロセスを変更せずに、低コストで量産性
のあるプロセスにより、接合部の高温時の長期信頼性を
向上させることができる。また、このとき、第１の金属
ワイヤ３の材質に錫（Ｓｎ）合金を用いる代わりに、プ
ラチナ（Ｐｔ）、ニッケル（Ｎｉ）、パラジウム（Ｐ
ｄ）、ニオブ（Ｎｂ）、タンタル（Ｔａ）、チタン（Ｔ
ｉ）等を用いれば、製品コストは上がるものの高温時の
長期信頼性を飛躍的に向上させることが可能となる。Further, if the second embodiment is used as a bonding means for a semiconductor chip, a known process for manufacturing a semiconductor chip is not changed, and a low-cost and mass-producible process can be used at a high temperature at the junction. Long-term reliability can be improved. At this time, instead of using a tin (Sn) alloy as the material of the first metal wire 3, platinum (Pt), nickel (Ni), palladium (P
d), niobium (Nb), tantalum (Ta), titanium (T
If i) and the like are used, the product cost is increased, but the long-term reliability at high temperatures can be dramatically improved.

【００７５】続く、図４は、大規模集積回路（ＬＳＩ）
パッケージに２種以上のボンディング方法を適用する場
合の一例を示す説明図であって、（ａ）は上面図、
（ｂ）はそのＡ−Ａ’ライン部分の断面図である。FIG. 4 shows a large scale integrated circuit (LSI).
It is explanatory drawing which shows an example at the time of applying two or more types of bonding methods to a package, (a) is a top view,
(B) is a cross-sectional view taken along the line AA '.

【００７６】図４（ａ）、（ｂ）において、２５はシリ
コン（Ｓｉ）チップ、２６はアクティブエリア、２７は
接続端子、２８は第１のバンプである。In FIGS. 4A and 4B, 25 is a silicon (Si) chip, 26 is an active area, 27 is a connection terminal, and 28 is a first bump.

【００７７】そして、シリコン（Ｓｉ）チップ２５は、
中央にアクティブエリア２６が形成され、その周辺にア
ルミニウム（Ａｌ）合金からなる複数の接続端子２７が
形成される。これら複数の接続端子２７において、その
中の特定のものだけには、金（Ａｕ）からなる第１の金
属ワイヤ３によって形成された第１のバンプ２８が圧着
され、残りのものには、なにも取付けられていない。こ
の場合、第１のバンプ２８が圧着されている接続端子２
７については、前述の第２の実施例の方法のように、第
１のバンプ２８上に第２のバンプ２４を接合させること
により第２の金属ワイヤ２１を接続させ、一方、なにも
圧着されていない接続端子２７については、前述の第１
の実施例の方法のように、接続端子２７にバンプ４を圧
着させ後で、金属ワイヤ１０をそのバンプ４内に埋め込
み接続させるか、その他の方法によって金属ワイヤを接
続するようにしている。Then, the silicon (Si) chip 25
An active area 26 is formed at the center, and a plurality of connection terminals 27 made of an aluminum (Al) alloy are formed around the active area 26. Of the plurality of connection terminals 27, only a specific one of the connection terminals 27 is pressed with a first bump 28 formed by a first metal wire 3 made of gold (Au), and the remaining ones are not bonded. It is not attached to. In this case, the connection terminal 2 to which the first bump 28 is crimped is attached.
For 7, the second metal wire 21 is connected by bonding the second bump 24 on the first bump 28 as in the method of the second embodiment described above, while none of them is press-bonded. For the connection terminal 27 that is not connected,
After the bumps 4 are crimped to the connection terminals 27 as in the method of the embodiment, the metal wires 10 are embedded in the bumps 4 and connected, or the metal wires are connected by other methods.

【００７８】この例によれば、チップ製造における既知
のプロセスを変更することなしに、特定接続端子２７に
選択的に任意の材質からなる第１のバンプ２８を低コス
トで形成することが可能となり、特定接続端子２７、例
えば、チップの角にあって高い応力が発生する接続端子
２７の耐腐食性の向上、信頼性の向上、過負荷条件時に
断線して２次災害を起さない高機能パッケ−ジを、量産
性の高いプロセスにより、かつ、低コストで製造するこ
とが可能になる。According to this example, it is possible to selectively form the first bumps 28 made of an arbitrary material on the specific connection terminals 27 at low cost without changing a known process in chip manufacturing. The specific connection terminal 27, for example, the connection terminal 27 where a high stress is generated at the corner of the chip, has improved corrosion resistance and reliability, and has a high function that does not cause a secondary disaster due to disconnection during an overload condition. The package can be manufactured by a process with high mass productivity and at low cost.

【００７９】なお、本例において、接続端子２７がセラ
ミック基板上に厚膜印刷後に焼成により形成された材質
である場合には、金（Ａｕ）または銀（Ａｇ）系の金属
あるいはそれらの合金からなる金属ワイヤ３を用いて第
１のバンプ２８を形成し、その第１のバンプ２８に金
（Ａｕ）あるいは銀（Ａｇ）系の金属ワイヤ１０をボン
ディングするようにすれば、接合部の剥離の発生を防ぐ
ことが可能になる。In this example, when the connection terminal 27 is made of a material formed by firing after printing a thick film on a ceramic substrate, the connection terminal 27 is made of a metal of gold (Au) or silver (Ag) or an alloy thereof. If the first bump 28 is formed using the metal wire 3 and the gold (Au) or silver (Ag) -based metal wire 10 is bonded to the first bump 28, the peeling of the bonding portion is prevented. It is possible to prevent occurrence.

【００８０】続いて、図５（ａ）乃至（ｄ）は、非めっ
きリ−ドフレ−ムの接合部に本発明によるボンディング
方法を適用する際の接続工程の一例を示す説明図であ
る。Next, FIGS. 5A to 5D are explanatory views showing an example of a connection process when the bonding method according to the present invention is applied to a joint portion of a non-plated lead frame.

【００８１】図５（ａ）乃至（ｄ）において、２９は銅
（Ｃｕ）系金属からなる非めっきリ−ドフレ−ム、３０
は同じく銅（Ｃｕ）系金属からなるダイ、３１はシリコ
ン（Ｓｉ）チップ、３２は接続端子、３３はチャック、
３４はダイボンド部、３５は第２のボンディングツー
ル、３６は第３のボール部であり、その他、図１に示さ
れた構成要素と同じ構成要素には同じ符号を付けてい
る。5A to 5D, reference numeral 29 denotes a non-plated lead frame made of a copper (Cu) -based metal;
Is a die made of copper (Cu) -based metal, 31 is a silicon (Si) chip, 32 is a connection terminal, 33 is a chuck,
Reference numeral 34 denotes a die bonding portion, 35 denotes a second bonding tool, 36 denotes a third ball portion, and other components that are the same as those shown in FIG.

【００８２】前記構成による金属ワイヤの接続工程は、
次のとおりである。The connecting step of the metal wire according to the above-described configuration includes:
It is as follows.

【００８３】まず、図５（ａ）に示されるように、非め
っきリードフレーム２９のボンディング面において、金
（Ａｕ）からなる金属ワイヤ３をキャピラリツ−ル５の
細孔部に挿通させ、その先端にボ−ル部４を形成した
後、このボ−ル部４をキャピラリツ−ル５により前記ボ
ンディング面上に押え付け、同時に、熱及び超音波９を
加えて圧着させる。First, as shown in FIG. 5 (a), a metal wire 3 made of gold (Au) is inserted through the pores of the capillary 5 on the bonding surface of the non-plated lead frame 29, After the ball portion 4 is formed, the ball portion 4 is pressed onto the bonding surface by a capillary tool 5 and simultaneously pressed by applying heat and ultrasonic waves 9.

【００８４】次に、図５（ｂ）に示されるように、チャ
ック３３を閉じてキャピラリツ−ル５を上方に引き上
げ、金属ワイヤ３とボ−ル部４との境界を破断し、切断
部６を有するボール部４を前記ボンディング面上に残留
させる。Next, as shown in FIG. 5B, the chuck 33 is closed, the capillary tool 5 is pulled up, the boundary between the metal wire 3 and the ball portion 4 is broken, and the cutting portion 6 is cut. Is left on the bonding surface.

【００８５】続いて、図５（ｃ）に示されるように、表
面が平坦な治具１１を用いてボ−ル部４の上表面に荷重
を加えて平坦にし、表面が平坦なバンプ７を形成させ
る。Subsequently, as shown in FIG. 5 (c), a load is applied to the upper surface of the ball portion 4 by using a jig 11 having a flat surface to make it flat, and the bump 7 having a flat surface is removed. Let it form.

【００８６】次いで、図５（ｄ）に示されるように、シ
リコン（Ｓｉ）チップ３１をダイ３０上にダイボンド部
３４を介して取り付ける。そして、ウエッジボンディン
グツール１１を用いて、表面が平坦なバンプ７上に金
（Ａｕ）からなる第２の金属ワイヤ１０を埋め込んでウ
エッジボンディングさせ、さらに、第２のボンディング
ツール３５を用いて第２の金属ワイヤ１０の先端に第３
のボール部３６を形成した後、その第３のボール部３６
をシリコン（Ｓｉ）チップ３１に設けられた接続端子３
６上に押し付けて圧着させ、非めっきリードフレーム２
９のボンディング面と接続端子３６との間のリード接続
を行っている。Next, as shown in FIG. 5D, a silicon (Si) chip 31 is mounted on the die 30 via a die bond portion. Then, using a wedge bonding tool 11, a second metal wire 10 made of gold (Au) is buried on the bump 7 having a flat surface to perform wedge bonding, and a second bonding tool 35 is used to perform a second wedge bonding. The third end of the metal wire 10
After forming the ball portion 36, the third ball portion 36
Are connected to the connection terminals 3 provided on the silicon (Si) chip 31.
6 and press-bonded to form a non-plated lead frame 2
The lead connection between the bonding surface 9 and the connection terminal 36 is performed.

【００８７】この例において、非めっきリ−ドフレ−ム
２９の入荷直後における、その接合表面の清浄状態がよ
く、かつ、接合性がよい時に、前記ボンディング面に表
面が平坦なバンプ７を形成しておけば、製品の製造調整
により保管期間が長くなった時でも、バンプ４と非めっ
きリ−ドフレ−ム２９との接合面の接合性が良好である
ため、保存期間あるいは保存環境に関係なく、前記接合
面に接合不良を生じさせることがなくなる。In this example, the bump 7 having a flat surface is formed on the bonding surface when the cleanness of the bonding surface is good and the bonding property is good immediately after the non-plated lead frame 29 is received. If this is done, even when the storage period is prolonged due to product manufacturing adjustment, the bonding property of the bonding surface between the bump 4 and the non-plated lead frame 29 is good, regardless of the storage period or storage environment. In addition, it is possible to prevent the occurrence of defective bonding on the bonding surface.

【００８８】次に、図６は、パワ−トランジスタの実装
に、本発明に係わるボンディングを適用する際の一例を
示す説明図であって、（ａ）は上面図、（ｂ）はそのＡ
−Ａ’ライン部分の断面図である。Next, FIGS. 6A and 6B are explanatory views showing an example in which the bonding according to the present invention is applied to the mounting of the power transistor. FIG. 6A is a top view, and FIG.
It is sectional drawing of the -A 'line part.

【００８９】図６（ａ）、（ｂ）において、３７はリー
ドフレームのダイ、３８は信号取出しリ−ド、３９はレ
ジンモールド、４０はダイボンド部、４１はトランジス
タチップ、４２は錫（Ｓｎ）−銀（Ａｇ）からなる低融
点バンプ、４３はアルミニウム（Ａｌ）からなる金属ワ
イヤ、４４は接続端子である。6 (a) and 6 (b), reference numeral 37 denotes a lead frame die, 38 denotes a signal extraction lead, 39 denotes a resin mold, 40 denotes a die bonding portion, 41 denotes a transistor chip, and 42 denotes tin (Sn). -A low melting point bump made of silver (Ag), 43 is a metal wire made of aluminum (Al), and 44 is a connection terminal.

【００９０】そして、ダイ３７は、ダイボンド部４０を
介してトランジスタチップ４１が接着されており、この
トランジスタチップ４１上に２つの接続端子４４が設け
られている。この２つの接続端子４４と信号取出しリー
ド３８は、それぞれ金属ワイヤ４３を介して接続され、
一方の金属ワイヤ４３の信号取出しリード３８との接続
部は低融点バンプ４２を介して接続されている。ダイ３
７、トランジスタチップ４１金属ワイヤ４３、信号取出
しリード３８の接続部は、ともにレジンモ−ルド３９さ
れ、全体としてパワ−トランジスタパッケ−ジが構成さ
れている。The die 37 has a transistor chip 41 adhered thereto via a die bonding portion 40, and two connection terminals 44 are provided on the transistor chip 41. The two connection terminals 44 and the signal extraction lead 38 are connected via metal wires 43, respectively.
The connection portion of one of the metal wires 43 to the signal extraction lead 38 is connected via the low melting point bump 42. Die 3
7, the connection portions of the metal wires 43 of the transistor chip 41 and the signal extraction leads 38 are both resin-molded 39 to form a power transistor package as a whole.

【００９１】ところで、既知のこの種のパワ−トランジ
スタパッケ−ジにおいては、信号取出しリード３８と金
属ワイヤ４３との接続部に、低融点バンプ４２を有して
いなかったため、過負荷時、即ち、過電流が流れた時に
アルミニウム（Ａｌ）の赤熱によりレジンが炭化し、発
火に至ることがあったのに対し、本例のパワ−トランジ
スタパッケ−ジは、過電流が流れてレジンが炭化して
も、レジンの発火前に低融点バンプ４２が溶融して断線
を生じ、パワ−トランジスタパッケ−ジの発火が防げ
る。また、本例のパワ−トランジスタパッケ−ジは、低
融点バンプ４２の電流通流経路が短く、正常動作時にお
けるオン抵抗を既知のものと同等にできるので、既知の
ものと同等の性能を持ち、しかも、ヒュ−ズ機能の付加
により安全対策を施したパワ−トランジスタパッケ−ジ
を、低コストで製造することが可能になる。In the known power transistor package of this type, since the low melting point bump 42 is not provided at the connecting portion between the signal extraction lead 38 and the metal wire 43, the overload, that is, When the overcurrent flows, the resin carbonizes due to the red heat of aluminum (Al) and may cause ignition. On the other hand, in the power transistor package of this example, the resin carbonizes due to the overcurrent flowing. Also, the low melting point bump 42 is melted before the resin is ignited to cause disconnection, thereby preventing the power transistor package from being ignited. Further, the power transistor package of this example has a short current flow path of the low melting point bumps 42 and can have an on-resistance during normal operation equal to that of a known one, so that it has the same performance as that of the known one. In addition, it is possible to manufacture a power transistor package with safety measures by adding a fuse function at a low cost.

【００９２】続く、図７は、パワ−モジュ−ルの実装
に、本発明に係わるボンディングを適用する際の一例を
示す説明図であって、（ａ）は上面図、（ｂ）はそのＡ
−Ａ’ライン部分の断面図である。FIGS. 7A and 7B are explanatory views showing an example in which the bonding according to the present invention is applied to the mounting of the power module. FIG. 7A is a top view, and FIG.
It is sectional drawing of the -A 'line part.

【００９３】図７（ａ）、（ｂ）において、４５は放熱
基板、４６は絶縁層、４７は導体層、４８はシリコン
（Ｓｉ）からなるパワ−デバイス、４９、５３は接続端
子、５０は純タンタル（Ｔａ）からなる軸対象に近い形
状のバンプ、５１はアルミニウム（Ａｌ）からなる太線
の金属ワイヤ、５２はダイオードチップ、５４は金属ワ
イヤである。7A and 7B, reference numeral 45 denotes a heat dissipation substrate, 46 denotes an insulating layer, 47 denotes a conductor layer, 48 denotes a power device made of silicon (Si), 49 and 53 denote connection terminals, and 50 denotes a connection terminal. A bump made of pure tantalum (Ta) and having a shape close to the axial symmetry, 51 is a thick metal wire made of aluminum (Al), 52 is a diode chip, and 54 is a metal wire.

【００９４】そして、放熱基板４５は、その上に絶縁層
４６が形成され、その絶縁層４６上には、略コ字型の導
体層４７、パワ−デバイス４８、ダイオードチップ５２
等が搭載されている。このパワ−デバイス４８は、複数
個の接続端子４９を有し、これら接続端子４９は、太線
の金属ワイヤ５１を介して導体層４７に接続される。こ
の場合、接続端子４９と太線の金属ワイヤ５１との接続
は、接続端子４９上に超音波ボンディングされたバンプ
５０を介して行われる。ダイオードチップ５２は、同じ
く接続端子５３を有し、この接続端子５３は、金属ワイ
ヤ５４を介して導体層４７に接続され、パワ−モジュ−
ルが構成されている。On the heat radiation substrate 45, an insulating layer 46 is formed thereon, and a substantially U-shaped conductor layer 47, a power device 48, and a diode chip 52 are formed on the insulating layer 46.
And so on. The power device 48 has a plurality of connection terminals 49, and these connection terminals 49 are connected to the conductor layer 47 through thick metal wires 51. In this case, the connection between the connection terminal 49 and the thick metal wire 51 is performed via a bump 50 ultrasonically bonded onto the connection terminal 49. The diode chip 52 also has a connection terminal 53, which is connected to the conductor layer 47 via a metal wire 54, and is connected to the power module.
Is configured.

【００９５】本例によれば、アルミニウム（Ａｌ）から
なる太線の金属ワイヤ５１とパワ−デバイス４８の接続
端子４９との間に、熱膨張係数がアルミニウム（Ａｌ）
とシリコン（Ｓｉ）との中間の値を有する金属、例え
ば、純タンタル（Ｔａ）を用いてバンプ５０を形成して
いるため、接続端子４９と太線の金属ワイヤ５１との間
に生じる接合界面の熱歪を低減させることが可能とな
り、パワーモジュ−ルのパワ−サイクルや温度サイクル
寿命を大幅に増加させることができる。According to this embodiment, the thermal expansion coefficient between the thick metal wire 51 made of aluminum (Al) and the connection terminal 49 of the power device 48 is aluminum (Al).
Since the bumps 50 are formed using a metal having an intermediate value between the metal and silicon (Si), for example, pure tantalum (Ta), a bonding interface generated between the connection terminal 49 and the thick metal wire 51 is formed. Thermal distortion can be reduced, and the power cycle and temperature cycle life of the power module can be greatly increased.

【００９６】なお、本例において、パワ−デバイスの接
続端子４９上に太線の金属ワイヤ５１と同じ熱膨張係数
を有する純アルミニウム（Ａｌ）からなる真円に近い形
状のバンプ５０を形成し、そのバンプ５０上にアルミニ
ウム（Ａｌ）からなる太い金属ワイヤ５１をウェッジボ
ンディングさせるようにすれば、接合面積が同じであっ
ても、太い金属ワイヤ５１を直接接続端子４９上にウェ
ッジボンディングした場合に比べて接合面の最大長さを
短縮でき、長さに比例して歪量を小さくできるため、モ
ジュ−ルのパワ−サイクルや温度サイクル寿命を大幅に
増加させることが可能となる。In this embodiment, a bump 50 having a shape close to a perfect circle made of pure aluminum (Al) having the same coefficient of thermal expansion as the thick metal wire 51 is formed on the connection terminal 49 of the power device. When the thick metal wire 51 made of aluminum (Al) is wedge-bonded on the bump 50, even when the bonding area is the same, compared with the case where the thick metal wire 51 is directly wedge-bonded on the connection terminal 49. Since the maximum length of the joint surface can be reduced and the amount of strain can be reduced in proportion to the length, the power cycle and temperature cycle life of the module can be greatly increased.

【００９７】次いで、図８は、液晶モジュ−ルに、本発
明に係わるボンディングを適用する際の一例を示す説明
図である。Next, FIG. 8 is an explanatory diagram showing an example when the bonding according to the present invention is applied to a liquid crystal module.

【００９８】図８において、５５は配線基板、５６は接
続端子、５７は金（Ａｕ）からなる第１のバンプ、５８
は第１のガラス板、５９は第２のガラス板、６０は液晶
モジュール、６１はチタン（Ｔｉ）からなる第２のバン
プ、６２は金（Ａｕ）からなる金属リード、６３は液晶
駆動用電子回路素子である。In FIG. 8, 55 is a wiring board, 56 is a connection terminal, 57 is a first bump made of gold (Au), 58
Is a first glass plate, 59 is a second glass plate, 60 is a liquid crystal module, 61 is a second bump made of titanium (Ti), 62 is a metal lead made of gold (Au), and 63 is a liquid crystal driving electron. Circuit element.

【００９９】そして、配線基板５５上には、接続端子５
６、２枚のガラス板５８、５９からなる液晶モジュール
６０、液晶駆動用電子回路素子６３等が搭載される。こ
の液晶モジュ−ル６０には、導電性酸化物からなる透明
電極端子上に第２のバンプ６１がボ−ルボンディングに
よって形成され、配線基板５５には、接続端子５６上に
第１のバンプ５７がボ−ルボンディングによって形成さ
れている。第１のバンプ５７には金属リード６２の一端
が埋め込まれてそれらが接続され、第２のバンプ６１に
は金属リード６２の他端に形成された第３のバンプを介
してそれらが接続され、液晶モジュ−ルが構成されてい
る。The connection terminals 5 are provided on the wiring board 55.
6, a liquid crystal module 60 including two glass plates 58 and 59, a liquid crystal driving electronic circuit element 63, and the like are mounted. In the liquid crystal module 60, a second bump 61 is formed by ball bonding on a transparent electrode terminal made of a conductive oxide, and on a wiring board 55, a first bump 57 is formed on a connection terminal 56. Are formed by ball bonding. One end of a metal lead 62 is embedded and connected to the first bump 57, and they are connected to the second bump 61 via a third bump formed at the other end of the metal lead 62, A liquid crystal module is configured.

【０１００】本例によれば、導電性酸化物との接合可能
な活性金属、例えば、チタン（Ｔｉ）を用いることによ
って、導電性酸化物からなる透明電極端子の上に第２の
バンプ６１をボンディングにより直接形成できるので、
接合のための金属化膜の形成を省略することができ、製
造コストを低減させることができる。また、配線基板５
５には、接続端子５６上に、ワイヤボンディング性の良
好な金（Ａｕ）からなる第１のバンプ５７を予め形成す
るようにしているため、ワイヤボンディング前の半田付
け工程において、接合表面がフラックス等の有機物で汚
染された場合においても、接合不良を生じることなく、
ワイヤボンディングによる組立てを行うことができ、歩
留まり向上によって、製造コストの低減を図ることがで
きる。According to this embodiment, the second bump 61 is formed on the transparent electrode terminal made of the conductive oxide by using an active metal that can be bonded to the conductive oxide, for example, titanium (Ti). Because it can be formed directly by bonding,
The formation of a metallized film for bonding can be omitted, and the manufacturing cost can be reduced. Also, the wiring board 5
5, the first bump 57 made of gold (Au) having good wire bonding property is formed on the connection terminal 56 in advance, so that the bonding surface has a flux in the soldering process before wire bonding. Even if it is contaminated with organic substances such as
Assembly by wire bonding can be performed, and the production cost can be reduced by improving the yield.

【０１０１】[0101]

【発明の効果】以上述べたように、請求項１に記載の発
明によれば、接続端子１にボール部４を圧着し、ボール
部４の表面を平坦にして形成したバンプ７に金属ワイヤ
１０を加圧ボンディングするに際し、バンプ７の材質と
して、金属ワイヤ１０に等しいかそれよりも低い硬度の
ものを選んでいるので、ボ−ル部４の押圧により形成さ
れるバンプ７は、肉厚が数１０乃至数１００μｍのもの
を容易に形成できる。そして、バンプ７の材質も、ワイ
ヤ加工できる金属であり、かつ、前述の硬度特性を満た
すものであれば種々のものが選択でき、接続端子１の材
質に対する、バンプ７の材質と金属ワイヤ１０の材質の
選択も、種々のものの選択が可能になるという効果があ
る。As described above, according to the first aspect of the present invention, the metal wire 10 is formed on the bump 7 formed by flattening the surface of the ball portion 4 by pressing the ball portion 4 onto the connection terminal 1. When pressure bonding is performed, a material having a hardness equal to or lower than that of the metal wire 10 is selected as the material of the bump 7, so that the thickness of the bump 7 formed by pressing the ball portion 4 is small. Those having several tens to several hundreds of μm can be easily formed. Also, the material of the bump 7 can be selected from various materials as long as it is a metal that can be processed by wire and satisfies the above-described hardness characteristics. As for the selection of the material, there is an effect that various things can be selected.

【０１０２】また、請求項１に記載の発明によれば、バ
ンプ７と第２の金属ワイヤ１０との接合に、常温による
超音波加圧ボンディングを利用しているので、バンプ７
の変形によって、金属ワイヤ１０がバンプ７内に埋め込
まれるように接合され、金属ワイヤ１０を変形させず
に、バンプ７との接触面積を増大させることができる。
そして、バンプ７の変形が大きいため、バンプ７側の清
浄面を確実かつ容易に得ることができ、金属ワイヤ１０
の変形が小さい状態で、バンプ７との接合率を大きくで
きるという効果がある。According to the first aspect of the present invention, since the ultrasonic pressure bonding at room temperature is used for joining the bump 7 and the second metal wire 10, the bump 7
Due to the deformation, the metal wire 10 is bonded so as to be embedded in the bump 7, and the contact area with the bump 7 can be increased without deforming the metal wire 10.
And since the deformation of the bump 7 is large, a clean surface on the bump 7 side can be obtained reliably and easily, and the metal wire 10
There is an effect that the joining ratio with the bump 7 can be increased in a state where the deformation of the bump is small.

【０１０３】さらに、請求項１に記載の発明によれば、
ボ−ル部４の押圧によって形成されるバンプ７は、大
径、かつ、厚肉状態のものであるため、端子基板２に加
わる集中荷重が軽減され、超音波振動によって発生する
歪もバンプ７内で分散緩和されて、端子基板２に加わる
応力が小さくなり、端子基板２の損傷を低減できるとい
う効果がある。Further, according to the first aspect of the present invention,
Since the bump 7 formed by pressing the ball portion 4 has a large diameter and a thick state, the concentrated load applied to the terminal board 2 is reduced, and the distortion generated by ultrasonic vibration is reduced. The stress applied to the terminal board 2 is reduced because the dispersion is alleviated in the inside, and there is an effect that the damage to the terminal board 2 can be reduced.

【０１０４】次に、請求項２に記載の発明によれば、接
続端子１にボール部４を圧着した後、ボール部４を変形
してバンプ７を形成し、そのバンプ７の接合面に金属ワ
イヤ２１を加圧ボンディングするに際し、バンプ７の材
質として、接続端子１の導電材質との間で金属間化合物
を形成しないか金属間化合物の成長が遅いものが選ばれ
ているので、接続端子１とバンプ７との間の異種金属接
合界面に成長する脆い金属間化合物を形成される確率が
きわめて小さくなり、その脆い金属間化合物の形成に基
づく接合部の強度低下を防ぐことができるという効果が
ある。Next, according to the second aspect of the present invention, after the ball portion 4 is pressure-bonded to the connection terminal 1, the ball portion 4 is deformed to form the bump 7, and the bonding surface of the bump 7 is When the wire 21 is subjected to pressure bonding, a material that does not form an intermetallic compound with the conductive material of the connection terminal 1 or that has a slow growth of the intermetallic compound is selected as the material of the bump 7. The probability that a brittle intermetallic compound that grows at the dissimilar metal bonding interface between the metal and the bump 7 is formed becomes extremely small, and the effect of preventing a decrease in the strength of the bonded portion due to the formation of the brittle intermetallic compound can be prevented. is there.

【０１０５】また、請求項２に記載の発明によれば、バ
ンプ７における金属ワイヤ１０との接合面は、整形加工
やクリーニング等の処理が行われた後、第２のバンプ２
４がボンディングされるので、バンプ７と第２のバンプ
（金属ワイヤ）２４との間の接合が確実に行われ、それ
らの間の接合不良の発生をきわめて少なくすることがで
きるという効果がある。According to the second aspect of the present invention, the surface of the bump 7 to be bonded to the metal wire 10 is subjected to a shaping process, a cleaning process, or the like, and then to the second bump 2.
Since 4 is bonded, the bonding between the bump 7 and the second bump (metal wire) 24 is reliably performed, and there is an effect that occurrence of poor bonding between them can be extremely reduced.

【０１０６】続いて、請求項５に記載の発明によれば、
接続端子１と、接続端子１上に圧着され、表面が平坦な
バンプ７と、バンプ７の平坦な表面に超音波加圧ボンデ
ィングされた金属ワイヤ１０とからなるボンディング構
造を得るに際し、バンプ７の材質として、接続端子１の
導電材質及び金属ワイヤ１０に等しいかそれよりも低い
硬度を有するものを選び、かつ、金属ワイヤ１０がバン
プ７に埋め込まれた状態で接合されているので、金属ワ
イヤ１０の変形が少ない状態で、バンプ７と金属ワイヤ
１０との接触面積、即ち、接触率を増大させたボンディ
ング構造が得られ、しかも、バンプ７を厚肉状態に形成
したことにより、端子基板２の損傷を低減させたボンデ
ィング構造が得られるという効果がある。Subsequently, according to the fifth aspect of the present invention,
In obtaining a bonding structure including the connection terminal 1, a bump 7 having a flat surface, and a metal wire 10 bonded to the flat surface of the bump 7 by ultrasonic pressure, the bump 7 is pressed on the connection terminal 1. As the material, a material having a hardness equal to or lower than the conductive material of the connection terminal 1 and the metal wire 10 is selected, and the metal wire 10 is bonded in a state of being embedded in the bump 7. In a state where the deformation of the terminal board 2 is small, a bonding structure in which the contact area between the bump 7 and the metal wire 10, that is, the contact ratio is increased, is obtained. There is an effect that a bonding structure with reduced damage can be obtained.

【０１０７】さらに、請求項６に記載の発明によれば、
接続端子１と、接続端子１上に圧着され、接合面を清浄
化したバンプ７と、このバンプ７の清浄化した接合面に
加圧ボンディングされた２１金属ワイヤに連なる第２の
バンプ２４とからなるボンディング構造を得るに際し、
バンプ７の材質として、接続端子１の導電材質との間で
脆い金属間化合物を形成しないか金属間化合物の成長が
遅いものが選ばれ、しかも、バンプ７の清浄化された接
合面のほぼ全域に第２のバンプ２４の接合面が接合され
ているので、接続端子１とバンプ７との接合部に脆い金
属間化合物が形成されることがなく、その接合部の高温
時の信頼性を大幅に向上させたボンディング構造が得ら
れ、しかも、バンプ７と第２のバンプ（金属ワイヤ）２
４との接合不良を大幅に低減させたボンディング構造が
得られるという効果がある。Further, according to the invention described in claim 6,
The connection terminals 1, the bumps 7 that are crimped on the connection terminals 1 and whose bonding surfaces have been cleaned, and the second bumps 24 that are connected to 21 metal wires that are pressure-bonded to the cleaned bonding surfaces of the bumps 7. In obtaining a bonding structure that
As the material of the bump 7, a material which does not form a brittle intermetallic compound with the conductive material of the connection terminal 1 or whose growth of the intermetallic compound is slow is selected. Since the bonding surfaces of the second bumps 24 are bonded to each other, no brittle intermetallic compound is formed at the bonding portions between the connection terminals 1 and the bumps 7, and the reliability of the bonding portions at high temperatures is greatly improved. And the bump 7 and the second bump (metal wire) 2 can be obtained.
This has the effect of obtaining a bonding structure in which the number of bonding failures with No. 4 is greatly reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係わるボンディング方法の第１の実施
例を示す工程図である。FIG. 1 is a process chart showing a first embodiment of a bonding method according to the present invention.

【図２】図１に図示されたボンディング方法を、薄膜磁
気ヘッドの信号用リ−ド線の接続に適用した際の接続状
態を示す斜視図である。FIG. 2 is a perspective view showing a connection state when the bonding method shown in FIG. 1 is applied to connection of a signal lead line of a thin-film magnetic head.

【図３】本発明に係わるボンディング方法の第２の実施
例を示す工程図である。FIG. 3 is a process chart showing a second embodiment of the bonding method according to the present invention.

【図４】大規模集積回路（ＬＳＩ）パッケージに２種以
上のボンディング方法を適用する場合の一例を示す説明
図である。FIG. 4 is an explanatory diagram showing an example in which two or more bonding methods are applied to a large-scale integrated circuit (LSI) package.

【図５】非めっきリ−ドフレ−ムの接合部に本発明によ
るボンディング方法を適用する際の接続工程の一例を示
す説明図である。FIG. 5 is an explanatory view showing an example of a connection step when the bonding method according to the present invention is applied to a joint portion of a non-plated lead frame.

【図６】パワ−トランジスタの実装に、本発明に係わる
ボンディングを適用する際の一例を示す説明図である。FIG. 6 is an explanatory diagram showing an example when applying bonding according to the present invention to mounting of a power transistor.

【図７】パワ−モジュ−ルの実装に、本発明に係わるボ
ンディングを適用する際の一例を示す説明図である。FIG. 7 is an explanatory diagram showing an example when the bonding according to the present invention is applied to the mounting of the power module.

【図８】液晶モジュ−ルに、本発明に係わるボンディン
グを適用する際の一例を示す説明図である。FIG. 8 is an explanatory diagram showing an example when the bonding according to the present invention is applied to a liquid crystal module.

【符号の説明】[Explanation of symbols]

１ 接続端子 ２ 端子基板 ３ 第１の金属ワイヤ（バンプ形成用ワイヤ） ４ ボ−ル部 ５ キャピラリタイプのボンディングツ−ル ６ 切断部 ７ バンプ ８ 端面が平坦な治具 ９ 超音波 １０ 第２の金属ワイヤ（配線リード用ワイヤ） １１ ウェッジボンディングツ−ル １２ セラミック製のスライダ− １３ 薄膜プロセスで形成した磁気センサ− １４−１ 第１の信号端子 １４−２ 第２の信号端子 １４−３ 第３の信号端子 １４−４ 第４の信号端子 １５−１ 第１の信号端子１４−１に形成された第１の
バンプ １５−２ 第２の信号端子１４−２に形成された第２の
バンプ １５−３ 第３の信号端子１４−３に形成された第３の
バンプ １５−４ 第４の信号端子１４−４に形成された第４の
バンプ １６−１ 第１の信号端子１４−１に取付けられる第１
の被覆リ−ド線 １６−２ 第２の信号端子１４−２に取付けられる第２
の被覆リ−ド線 １７−１ 第１の被覆リ−ド線１６−１の内部導体 １７−２ 第２の被覆リ−ド線１６−２の内部導体 １８−１ 第１の被覆リ−ド線１６−１の被覆 １８−２ 第２の被覆リ−ド線１６−２の被覆 １９ 集光レンズ ２０ レーザビーム ２１ 第２の金属ワイヤ ２２ 第２のボール部 ２３ ボンディングツール ２４ 第２のバンプDESCRIPTION OF SYMBOLS 1 Connection terminal 2 Terminal board 3 1st metal wire (wire for bump formation) 4 Ball part 5 Capillary type bonding tool 6 Cutting part 7 Bump 8 Jig with flat end face 9 Ultrasonic wave 10 Second Metal wire (wire for wiring lead) 11 Wedge bonding tool 12 Ceramic slider 13 Magnetic sensor formed by thin film process 14-1 First signal terminal 14-2 Second signal terminal 14-3 Third 14-4 Fourth signal terminal 15-1 First bump 15-2 formed on first signal terminal 14-1 Second bump 15 formed on second signal terminal 14-2 15 -3 Third bump formed on third signal terminal 14-3 15-4 Fourth bump formed on fourth signal terminal 14-4 16-1 Attached to first signal terminal 14-1 The first 1
The second lead terminal 16-2 attached to the second signal terminal 14-2.
17-1 Inner conductor of first covered lead line 16-1 17-2 Inner conductor of second covered lead line 16-2 18-1 First covered lead Covering line 16-1 18-2 Covering second covering lead line 16-2 19 Condensing lens 20 Laser beam 21 Second metal wire 22 Second ball portion 23 Bonding tool 24 Second bump

───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 和弥 茨城県日立市大みか町七丁目１番１号 株式会社 日立製作所 日立研究所内 (72)発明者 羽鳥 和夫 東京都小平市上水本町五丁目20番１号 株式会社 日立製作所 半導体事業部内 (72)発明者 山田 富男 東京都小平市上水本町五丁目20番１号 株式会社 日立製作所 半導体事業部内 (72)発明者 丸田 稔 神奈川県小田原市国府津2880番地 株式 会社 日立製作所 ストレージシステム 事業部内 (56)参考文献 特開 昭62−150836（ＪＰ，Ａ) 特開 平３−183139（ＪＰ，Ａ) 特開 平４−294552（ＪＰ，Ａ) 特開 平５−211192（ＪＰ，Ａ) 特開 平５−308089（ＪＰ，Ａ) 実開 昭63−10552（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01L 21/60 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuya Takahashi 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd. (72) Kazuo Hatori 5-chome, Kamimizu Honcho, Kodaira-shi, Tokyo No. 1 Hitachi, Ltd. Semiconductor Division (72) Inventor Tomio Yamada 5-20-1, Kamisumihonmachi, Kodaira-shi, Tokyo Hitachi, Ltd. Semiconductor Division (72) Inventor Minoru Maruta 2880 Kozu, Kozuhara, Odawara City, Kanagawa Prefecture Address Co., Ltd. Storage Systems Division, Hitachi, Ltd. (56) References JP-A-62-150836 (JP, A) JP-A-3-183139 (JP, A) JP-A-4-294552 (JP, A) 5-211192 (JP, A) JP-A-5-308089 (JP, A) JP-A-63-10552 (JP, U) (58) Fields investigated (Int. Cl. 7) , DB name) H01L 21/60

Claims (15)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 ボンディングツ−ルを用い、ボンディン
グ領域にボール部を圧着した後、そのボール部の表面を
平坦にして形成したバンプに金属ワイヤを加圧ボンディ
ングするボンディング方法において、前記バンプの材質
は、前記金属ワイヤの硬度に略等しいかそれよりも低い
硬度を有するものが選ばれ、前記表面を平坦にしたバン
プは、前記金属ワイヤの直径よりも大きな直径を有する
ような形状に形成され、前記金属ワイヤは、ボンディン
グ部分が超音波加圧ボンディングによって前記バンプの
平坦な表面に埋め込まれることを特徴とするボンディン
グ方法。1. A bonding method comprising: bonding a ball portion to a bonding area using a bonding tool; and pressing a metal wire onto a bump formed by flattening the surface of the ball portion. , the one having a substantially equal or lower hardness than the hardness of the metal wire is selected, bumps flattened the surface, than the diameter of the metal wire is shaped to have a larger diameter, The bonding method, wherein a bonding portion of the metal wire is embedded in a flat surface of the bump by ultrasonic pressure bonding. 【請求項２】 ボンディングツ−ルを用い、ボンディン
グ領域にボール部を圧着した後、そのボール部の表面を
処理して形成したバンプの表面に第２の金属ワイヤを加
圧ボンディングするボンディング方法において、前記バ
ンプの材質は、前記ボンディング領域の導電材質との間
で金属間化合物を形成しないか金属間化合物の成長が遅
いものが選ばれ、前記バンプは、第２の金属ワイヤとの
接合面の整形加工を行い、次いで、その接合面に蒸発除
去、物理的なエッチング除去、機械的な擦り付けのいず
れかの手段を用いてクリ−ニングし、ボンディングツ−
ルを用いて前記クリ−ニングした接合面に前記金属ワイ
ヤに連結された第２のバンプを加圧ボンディングさせる
ことを特徴とするボンディング方法。2. A bonding method in which a ball portion is pressure-bonded to a bonding area using a bonding tool, and a second metal wire is pressure-bonded to a surface of a bump formed by treating the surface of the ball portion. The material of the bump is selected so as not to form an intermetallic compound or to grow the intermetallic compound slowly with the conductive material of the bonding region, and the bump is formed on the bonding surface of the second metal wire. After performing a shaping process, the joint surface is cleaned using any one of evaporation removal, physical etching removal, and mechanical rubbing.
Bonding the second bump connected to the metal wire to the cleaned bonding surface by pressure bonding. 【請求項３】 前記ボンディング領域の導電材質がアル
ミニウム（Ａｌ）であるとき、前記バンプの材質は、ア
ルミニウム（Ａｌ）と化合物を形成しない錫（Ｓｎ）、
ゲルマニウム（Ｇｅ）、あるいは、アルミニウム（Ａ
ｌ）化合物の成長速度が遅いチタン（Ｔｉ）、ニオブ
（Ｎｂ）、タンタル（Ｔａ）、プラチナ（Ｐｔ）、パラ
ジウム（Ｐｄ）、ニッケル（Ｎｉ）のいずれかをベ−ス
とする金属あるいはそれらの合金であることを特徴とす
る請求項２に記載のボンディング方法。3. When the conductive material of the bonding region is aluminum (Al), the material of the bump is tin (Sn) which does not form a compound with aluminum (Al).
Germanium (Ge) or aluminum (A
l) Titanium (Ti), niobium (Nb), tantalum (Ta), platinum (Pt), para
3. The bonding method according to claim 2, wherein the bonding method is a metal based on one of indium (Pd) and nickel (Ni) or an alloy thereof. 【請求項４】 前記接合の蒸発除去は、プレス、研削、
超音波加工、溶融加工のいずれかの手段であり、前記蒸
発除去は、レーザ照射による表面層の除去であり、前記
物理的なエッチング除去は、プラズマ、イオン、アトム
照射であることを特徴とする請求項２に記載のボンディ
ング方法。4. The method according to claim 1, wherein the bonding is performed by pressing, grinding,
Ultrasonic processing, any means of melt processing, wherein the evaporation removal is removal of a surface layer by laser irradiation, and the physical etching removal is plasma, ion, atom irradiation The bonding method according to claim 2. 【請求項５】 導電材質からなるボンディング領域と、
前記ボンディング領域上に圧着され、表面が平坦にされ
たバンプと、前記バンプの平坦な表面に超音波加圧ボン
ディングされた金属ワイヤとからなるボンディング構造
において、前記バンプの材質は、前記ボンディング領域
の導電材質及び前記金属ワイヤの材質に略等しいかまた
はそれよりも低い硬度のものからなり、かつ、前記金属
ワイヤは、ボンディング部分の大部分が前記バンプの中
に埋め込まれていることを特徴とするボンディング構
造。5. A bonding region made of a conductive material,
In a bonding structure including a bump that has been pressure-bonded on the bonding area and a flattened surface, and a metal wire that is ultrasonically pressure-bonded to the flat surface of the bump, a material of the bump is a material of the bonding area. The conductive material and the material of the metal wire have a hardness substantially equal to or lower than that of the metal wire, and the metal wire has most of the bonding portion embedded in the bump. Bonding structure. 【請求項６】 導電材質からなるボンディング領域と、
前記ボンディング領域上に圧着され、表面が平坦かつ清
浄化にされた第１のバンプと、前記バンプの平坦な清浄
化表面に、金属ワイヤに連結された第２のバンプを加圧
ボンディングされてなるボンディング構造において、前
記バンプの材質は、前記ボンディング領域の導電材質と
の間で金属間化合物を形成しないか金属間化合物の成長
が遅いものが選ばれ、かつ、前記第１のバンプの清浄化
された接合面のほぼ全域に前記第２のバンプの接合面が
接合されていることを特徴とするボンディング構造。6. A bonding region made of a conductive material,
A first bump having a flat and clean surface pressed onto the bonding area, and a second bump connected to a metal wire is pressure-bonded to the flat clean surface of the bump. In the bonding structure, the material of the bump is selected so as not to form an intermetallic compound or to grow the intermetallic compound slowly with the conductive material of the bonding region, and to clean the first bump. A bonding surface of the second bump is bonded to almost the entirety of the bonded surface. 【請求項７】 前記ボンディング領域の導電材質がアル
ミニウム（Ａｌ）またはアルミニウム（Ａｌ）系合金で
あるとき、前記バンプの材質は、前記ボンディング領域
の導電材質よりも硬度の低い純金（Ａｕ）が選ばれるこ
とを特徴とする請求項５に記載のボンディング構造。7. When the conductive material of the bonding region is aluminum (Al) or an aluminum (Al) -based alloy, the material of the bump is selected from pure gold (Au) having a lower hardness than the conductive material of the bonding region. The bonding structure according to claim 5, wherein the bonding structure is formed. 【請求項８】 前記ボンディング領域の導電材質が金
（Ａｕ）または金（Ａｕ）系合金であるとき、前記バン
プの材質は、前記ボンディング領域の導電材質よりも硬
度の低い純アルミニウム（Ａｌ）が選ばれることを特徴
とする請求項５に記載のボンディング構造。8. When the conductive material of the bonding region is gold (Au) or a gold (Au) -based alloy, the material of the bump is pure aluminum (Al) having a lower hardness than the conductive material of the bonding region. The bonding structure according to claim 5, wherein the bonding structure is selected. 【請求項９】 前記ボンディング領域の導電材質が銅
（Ｃｕ）系または金（Ａｕ）系の金属あるいはそれらの
合金であるとき、前記バンプの材質は、チタン（Ｔ
ｉ）、ニオブ（Ｎｂ）、タンタル（Ｔａ）、プラチナ
（Ｐｔ）、パラジウム（Ｐｄ）、ニッケル（Ｎｉ）のい
ずれかをベ−スとした金属あるいはそれらの合金が選ば
れ、前記金属ワイヤの材質は、アルミニウム（Ａｌ）が
選ばれることを特徴とする請求項５に記載のボンディン
グ構造。9. When the conductive material of the bonding region is a copper (Cu) -based or gold (Au) -based metal or an alloy thereof, the material of the bump is titanium (T
i) a metal based on any one of niobium (Nb), tantalum (Ta), platinum (Pt), palladium (Pd), and nickel (Ni) or an alloy thereof is selected, and the material of the metal wire is selected. 6. The bonding structure according to claim 5, wherein aluminum (Al) is selected. 【請求項１０】 前記ボンディング領域の導電材質がア
ルミニウム（Ａｌ）系の金属あるいはその合金であると
き、前記バンプの材質は、アルミニウム（Ａｌ）と金属
間化合物を形成しない金属あるいは２００℃以下の温度
下での２０００時間の保持時間により形成される金属間
化合物の厚さが０．５μｍ以下である金属が選ばれ、前
記金属ワイヤの材質は、金（Ａｕ）、銀（Ａｇ）、銅
（Ｃｕ）のいずれかが選ばれることを特徴とする請求項
５に記載のボンディング構造。10. When the conductive material of the bonding region is an aluminum (Al) -based metal or an alloy thereof, the material of the bump is a metal that does not form an intermetallic compound with aluminum (Al) or a temperature of 200 ° C. or less. A metal having a thickness of 0.5 μm or less is selected for the intermetallic compound formed by the holding time of 2000 hours below, and the material of the metal wire is gold (Au), silver (Ag), copper (Cu). The bonding structure according to claim 5, wherein any one of the following is selected. 【請求項１１】 前記ボンディング領域の導電材質がア
ルミニウム（Ａｌ）系の金属あるいはその合金であると
き、前記バンプの材質は、アルミニウム（Ａｌ）あるい
は金（Ａｕ）よりも降伏強度もしくはヤング率が低い金
属またはその合金が選ばれ、前記金属ワイヤの材質は、
アルミニウム（Ａｌ）、金（Ａｕ）のいずれかが選ばれ
ることを特徴とする請求項５に記載のボンディング構
造。11. When the conductive material of the bonding region is an aluminum (Al) -based metal or an alloy thereof, the material of the bump has a lower yield strength or Young's modulus than aluminum (Al) or gold (Au). A metal or an alloy thereof is selected, and the material of the metal wire is
The bonding structure according to claim 5, wherein one of aluminum (Al) and gold (Au) is selected. 【請求項１２】 前記バンプの材質に選ばれた金属は、
錫（Ｓｎ）、アルミニウム（Ａｌ）、金（Ａｕ）、ゲル
マニウム（Ｇｅ）のいずれかの金属であることを特徴と
する請求項１１に記載のボンディング構造。12. A metal selected as a material of the bump,
The bonding structure according to claim 11, wherein the bonding structure is any one of tin (Sn), aluminum (Al), gold (Au), and germanium (Ge). 【請求項１３】 前記ボンディング領域の導電材質が厚
膜印刷後に焼成により形成された材質であるとき、前記
バンプの材質は、金（Ａｕ）、銀（Ａｇ）系のいずれか
の金属あるいはそれらの合金が選ばれ、前記金属ワイヤ
の材質は、金（Ａｕ）系あるいは銀（Ａｇ）系の金属が
選ばれることを特徴とする請求項５に記載のボンディン
グ構造。13. When the conductive material of the bonding region is a material formed by firing after printing a thick film, the material of the bump is any one of gold (Au) and silver (Ag) based metals or a metal thereof. The bonding structure according to claim 5, wherein an alloy is selected, and a material of the metal wire is selected from a gold (Au) -based or silver (Ag) -based metal. 【請求項１４】 前記ボンディング領域の導電材質が酸
化物系の材質であるとき、前記バンプの材質は、活性金
属が選ばれ、前記金属ワイヤの材質は、金（Ａｕ）系あ
るいはアルミニウム（Ａｌ）系の金属が選ばれることを
特徴とする請求項５に記載のボンディング構造。14. When the conductive material of the bonding region is an oxide-based material, an active metal is selected as a material of the bump, and a material of the metal wire is gold (Au) or aluminum (Al). 6. The bonding structure according to claim 5, wherein a metal of the system is selected. 【請求項１５】 前記ボンディング領域は、薄膜磁気デ
ィスク装置の薄膜磁気ヘッドの接続端子であるとき、前
記バンプの材質は、金（Ａｕ）系の金属が選ばれ、前記
金属ワイヤの材質は、金（Ａｕ）めっきされた銅（Ｃ
ｕ）の極細線が選ばれていることを特徴とする請求項５
に記載のボンディング構造。15. When the bonding area is a connection terminal of a thin film magnetic head of a thin film magnetic disk drive, a material of the bump is selected from a gold (Au) -based metal, and a material of the metal wire is gold. (Au) Plated copper (C
6. An ultrafine line of u) is selected.
3. The bonding structure according to 1.
JP31348993A 1993-12-14 1993-12-14 Bonding method and bonding structure Expired - Fee Related JP3262657B2 (en)

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US20070216026A1 (en) * 2006-03-20 2007-09-20 Adams Zhu Aluminum bump bonding for fine aluminum wire
WO2008038681A1 (en) * 2006-09-26 2008-04-03 Hitachi Metals, Ltd. Ceramic substrate component and electronic component using the same
KR100771893B1 (en) * 2007-04-12 2007-11-01 삼성전자주식회사 Method of bonding wires
JP5316261B2 (en) 2009-06-30 2013-10-16 富士通株式会社 Multichip module, printed circuit board unit and electronic device
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