JPH04258127A - Bump joining pad structure - Google Patents

Bump joining pad structure

Info

Publication number
JPH04258127A
JPH04258127A JP2005291A JP2005291A JPH04258127A JP H04258127 A JPH04258127 A JP H04258127A JP 2005291 A JP2005291 A JP 2005291A JP 2005291 A JP2005291 A JP 2005291A JP H04258127 A JPH04258127 A JP H04258127A
Authority
JP
Japan
Prior art keywords
bump
pad
printed
circuit board
groove
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.)
Withdrawn
Application number
JP2005291A
Other languages
Japanese (ja)
Inventor
Kuniharu Sato
佐藤 邦治
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP2005291A priority Critical patent/JPH04258127A/en
Publication of JPH04258127A publication Critical patent/JPH04258127A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/30Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/341Surface mounted components
    • H05K3/3431Leadless components
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/30Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/3452Solder masks

Abstract

PURPOSE:To enable an air bubble which is generated within a bump when electric parts are mounted to a printed-circuit board via a bump by forming a groove at an edge portion of a step-shaped bump joining pad. CONSTITUTION:A bump 6 is supplied to a pad 2 which is formed at an insulation layer 4 of a surface layer of a printed-circuit board 1 and an LS17 which is mounted to the printed-circuit board 1 is positioned. The pad 2 of the printed- circuit board 1 and a pad 9 of the LS17 are allowed to contact each other. the bump 6 is melted. and a heated air is supplied. In this case, an alcohol content within a flux which is previously coated between the bump 6 and pads 2 and 9 is vaporized along with melting of the bump 6. In this case. since a groove 5 is formed at an edge portion 2a of the pad 2, the vaporized gas is allowed to escape outside the insulation layer 4, thus enabling the gas to remain within the bump 6 and preventing the bump 6 to be expanded greatly for contacting an adjacent bump.

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、バンプ接合パッド構造
に係り、特にプリント板の表面に形成された多層構成か
らなる絶縁層上に形成された、電子部品のパッドとバン
プを介して接合されるバンプ接合パッド構造に関するも
のである。
[Field of Industrial Application] The present invention relates to a bump bonding pad structure, and more particularly, the present invention relates to a bump bonding pad structure that is bonded to a pad of an electronic component formed on a multilayer insulating layer formed on the surface of a printed circuit board via a bump. This invention relates to a bump bonding pad structure.

【0002】0002

【従来の技術】従来は図4および図5に示すように、そ
の内部に内部接続用のビア41を有する多層のプリント
板40の表面に形成されたパッド48に対して、そのプ
リント板40の表面に図示しないものの配線用のパター
ンが適宜形成された多層の絶縁層43に、断面視階段状
のパッド42が形成される。
2. Description of the Related Art Conventionally, as shown in FIGS. 4 and 5, pads 48 formed on the surface of a multilayer printed board 40 having internal connection vias 41 are A pad 42 having a step-shaped cross section is formed on a multilayer insulating layer 43 on which a wiring pattern (not shown) is appropriately formed.

【0003】このパッド42は、後にこのプリント板4
0に実装される電子部品44(以下、LSIと称する)
のパッド45とバンプ46を介して接続されるものであ
って、このパッド42を形成する時の工程上その形状は
絶縁層43a,43bによって階段状となる。
[0003] This pad 42 will later be attached to this printed board 4.
0 (hereinafter referred to as LSI)
The pad 42 is connected to the pad 45 via a bump 46, and due to the process of forming the pad 42, its shape is stepped due to the insulating layers 43a and 43b.

【0004】0004

【発明が解決しようとする課題】しかしなから、図5に
示すように上記LSI44をプリント板40に実装する
際にその間に設けられるバンプ46が溶融した場合に、
フラックス内のアルコール分が気化してガスとなり、バ
ンプ46内に気泡47として残留し、バンプ46が大き
く膨れ、隣りのバンプとショートする場合が発生する。
However, as shown in FIG. 5, when the bumps 46 provided between the LSI 44 and the printed circuit board 40 melt,
The alcohol content in the flux evaporates and becomes a gas, which remains in the bump 46 as bubbles 47, causing the bump 46 to swell greatly and short-circuit with the adjacent bump.

【0005】従って、本発明は、プリント板に電子部品
をバンプを介して実装する場合のバンプ内に発生する気
泡を抑制することを目的とするものである。
[0005] Accordingly, an object of the present invention is to suppress air bubbles generated in bumps when electronic components are mounted on a printed board via bumps.

【0006】[0006]

【課題を解決するための手段】上記目的は、プリント板
1に実装される電子部品のパッドとバンプを介して接す
る当該プリント板1に形成された、断面視階段状のバン
プ接合パッド2の構造において、階段状のバンプ接合パ
ッド2の縁部2aに、絶縁層4に所定の厚みを残してミ
ゾ5を形成したことを特徴とするバンプ接合パッド構造
、によって達成される。
[Means for Solving the Problems] The above object is to provide a structure of a bump bonding pad 2 which is formed on a printed board 1 and has a stepped shape in cross-section, and is in contact with a pad of an electronic component mounted on the printed board 1 via a bump. This is achieved by a bump bonding pad structure characterized in that a groove 5 is formed at the edge 2a of the stepped bump bonding pad 2, leaving a predetermined thickness in the insulating layer 4.

【0007】[0007]

【作用】即ち、本発明においては、階段状となったバン
プ接合パッドの縁部にミゾを形成しており、このミゾに
よってバンプ接合時に発生するフラックス内のガスを外
部に逃がすようになるため、バンプ内に気泡が残留する
ことがなく、また上記ミゾは絶縁層の一部の所定厚を残
して形成されているため、絶縁上の保証もなされている
[Operation] That is, in the present invention, a groove is formed at the edge of the stepped bump bonding pad, and this groove allows gas in the flux generated during bump bonding to escape to the outside. Since no air bubbles remain in the bump, and the groove is formed leaving a predetermined thickness of a portion of the insulating layer, insulation is guaranteed.

【0008】[0008]

【実施例】以下、本発明の望ましい実施例について図1
乃至図3を用いて詳細に説明する。
[Embodiment] A preferred embodiment of the present invention will be described below with reference to FIG.
This will be explained in detail using FIG. 3.

【0009】図1は本発明の実施例を示す図である。図
2はパッドの形状を示す図である。
FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing the shape of the pad.

【0010】図3は本発明のLSI実装を示す図である
。図1に示すように、その内部に内部接続用のビア3を
有する多層のプリント板1の表面に形成されたパッド8
に対して、そのプリント板1の表面に図示しないものの
配線用のパターンが適宜形成された多層の絶縁層4に、
断面視階段状のパッド2が形成されており、パッド8と
はその底面2cによって電気的な接続がなされている。
FIG. 3 is a diagram showing an LSI implementation of the present invention. As shown in FIG. 1, pads 8 are formed on the surface of a multilayer printed board 1 that has vias 3 for internal connection therein.
On the other hand, a multilayer insulating layer 4 on which a wiring pattern (not shown) is appropriately formed on the surface of the printed board 1,
A pad 2 having a step-like cross-sectional shape is formed, and is electrically connected to the pad 8 through its bottom surface 2c.

【0011】このパッド2は、後に説明するこのプリン
ト板1に実装される電子部品(以下、LSIと称する)
のパッドとバンプを介して接続されるものであって、こ
のパッド4を形成する時の工程上その形状は絶縁層4a
,4bによって階段状となっている。更に、このパッド
2の縁部2aにはスリット形状のミゾ5が形成されてお
り、図2に示すように縦横十字型に4本が形成されてい
る。
This pad 2 is an electronic component (hereinafter referred to as LSI) mounted on this printed board 1, which will be explained later.
It is connected to the pad of the insulating layer 4a via a bump.
, 4b form a staircase shape. Furthermore, slit-shaped grooves 5 are formed in the edge 2a of this pad 2, and four grooves 5 are formed in a vertical and horizontal cross shape as shown in FIG.

【0012】このミゾ5はパッド2の縁部2aと内径平
面部2bまでの厚み分の深さを有している。この厚みは
多層の絶縁層4a,4bを形成する時に決定されるもの
ではあるが、この厚みによって、たとえミゾ5を形成し
ても絶縁上の信頼性は確保されている。
The groove 5 has a depth equal to the thickness between the edge 2a of the pad 2 and the inner diameter flat portion 2b. Although this thickness is determined when forming the multilayer insulating layers 4a and 4b, insulation reliability is ensured even if grooves 5 are formed.

【0013】次に図3を用いてLSIを実装した場合に
ついて説明する。図3に示すように、プリント板1の表
面層の絶縁層4に形成されたパッド2に対して、バンプ
6を供給した後、プリント板1に実装されるLSI7を
位置合わせする。このLSI7には当該パッド2とその
裏面7aにパッド9を有している。
Next, the case where the LSI is mounted will be explained using FIG. As shown in FIG. 3, after bumps 6 are supplied to pads 2 formed on the insulating layer 4 on the surface layer of the printed board 1, the LSI 7 mounted on the printed board 1 is aligned. This LSI 7 has the pad 2 and a pad 9 on its back surface 7a.

【0014】プリント板1のパッド2とLSI7のパッ
ド9とをバンプ6を介して当接した後、当該バンプ6を
溶融し、互いを接続するために熱風を供給する。すると
、このバンプが溶融するのに伴って予めバンプ6と両パ
ッド2,9との間に塗布されるフラックス内のアルコー
ル分が気化する。従来ではこの気化したアルコール分が
ガスとなって気泡としてバンプ6内に残留していたが、
本例では、パッド2の縁部2aに形成されたミゾ5によ
って、ガスを絶縁層の外部へと逃がすにようになってい
る。一般的に気体はその逃げ道があるとそちらの方へ導
かれるため、バンプ6内にガスが残留し、そのバンプ6
が大きく膨れ、隣合うバンプと接触することがない。
After the pads 2 of the printed circuit board 1 and the pads 9 of the LSI 7 are brought into contact via the bumps 6, hot air is supplied to melt the bumps 6 and connect them to each other. Then, as the bump melts, the alcohol content in the flux previously applied between the bump 6 and both pads 2 and 9 evaporates. Conventionally, this vaporized alcohol turned into gas and remained in the bump 6 as bubbles, but
In this example, a groove 5 formed on the edge 2a of the pad 2 allows gas to escape to the outside of the insulating layer. Generally, if there is an escape route for gas, it will be guided towards that direction, so the gas will remain inside the bump 6 and the bump 6
The bumps swell greatly and do not come into contact with adjacent bumps.

【0015】[0015]

【発明の効果】以上説明したように本発明によって、バ
ンプ内にガスが残留することがないためバンプ内に気泡
が発生することを抑止できるため、バンプ信頼度の向上
および隣接バンプとのはんだショートの撲滅が可能とな
る。
[Effects of the Invention] As explained above, according to the present invention, gas does not remain in the bumps, so it is possible to suppress the generation of bubbles in the bumps, thereby improving the reliability of the bumps and preventing solder shorts with adjacent bumps. eradication becomes possible.

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】本発明の実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.

【図2】パッドの形状を示す図である。FIG. 2 is a diagram showing the shape of a pad.

【図3】本発明のLSI実装を示す図である。FIG. 3 is a diagram showing an LSI implementation of the present invention.

【図4】従来例を示す図である。FIG. 4 is a diagram showing a conventional example.

【図5】課題を示す図である。FIG. 5 is a diagram showing a problem.

【符号の説明】[Explanation of symbols]

1  プリント板 2  パッド(バンプ接合パッド) 4  絶縁層 5  ミゾ 6  バンプ 7  電子部品(LSI) 1 Printed board 2 Pad (bump bonding pad) 4 Insulating layer 5 Groove 6 Bump 7 Electronic components (LSI)

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  プリント板(1)に実装される電子部
品のパッドとバンプを介して接する当該プリント板(1
)に形成された、断面視階段状のバンプ接合パッド(2
)の構造において、階段状のバンプ接合パッド(2)の
縁部(2a)に、絶縁層(4)に所定の厚みを残してミ
ゾ(5)を形成したことを特徴とするバンプ接合パッド
構造。
Claim 1: A printed board (1) that is in contact with a pad of an electronic component mounted on the printed board (1) via a bump.
) formed on the bump bonding pad (2
), the bump bonding pad structure is characterized in that a groove (5) is formed at the edge (2a) of the stepped bump bonding pad (2), leaving a predetermined thickness in the insulating layer (4). .
JP2005291A 1991-02-13 1991-02-13 Bump joining pad structure Withdrawn JPH04258127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005291A JPH04258127A (en) 1991-02-13 1991-02-13 Bump joining pad structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005291A JPH04258127A (en) 1991-02-13 1991-02-13 Bump joining pad structure

Publications (1)

Publication Number Publication Date
JPH04258127A true JPH04258127A (en) 1992-09-14

Family

ID=12016300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005291A Withdrawn JPH04258127A (en) 1991-02-13 1991-02-13 Bump joining pad structure

Country Status (1)

Country Link
JP (1) JPH04258127A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009147106A (en) * 2007-12-14 2009-07-02 Rohm Co Ltd Semiconductor device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009147106A (en) * 2007-12-14 2009-07-02 Rohm Co Ltd Semiconductor device

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Legal Events

Date Code Title Description
A300 Application deemed to be withdrawn because no request for examination was validly filed

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19980514