JPH08264925A - Method for soldering lead terminal of surface mounting component - Google Patents

Method for soldering lead terminal of surface mounting component

Info

Publication number
JPH08264925A
JPH08264925A JP7069231A JP6923195A JPH08264925A JP H08264925 A JPH08264925 A JP H08264925A JP 7069231 A JP7069231 A JP 7069231A JP 6923195 A JP6923195 A JP 6923195A JP H08264925 A JPH08264925 A JP H08264925A
Authority
JP
Japan
Prior art keywords
solder paste
solder
lead frame
soldering
shaped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7069231A
Other languages
Japanese (ja)
Other versions
JP2642079B2 (en
Inventor
Shinichi Ishida
真一 石田
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.)
NEC Tohoku Corp
Original Assignee
NEC Tohoku Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Tohoku Corp filed Critical NEC Tohoku Corp
Priority to JP7069231A priority Critical patent/JP2642079B2/en
Publication of JPH08264925A publication Critical patent/JPH08264925A/en
Application granted granted Critical
Publication of JP2642079B2 publication Critical patent/JP2642079B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05K3/3421Leaded 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
    • H05K3/3457Solder materials or compositions; Methods of application thereof
    • H05K3/3485Applying solder paste, slurry or powder

Landscapes

  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

PURPOSE: To easily inspect visually and optically the appearance of soldered components so as to prevent the occurrence of solder bridges by alternately arranging solder paste on the outer and inner sides of points at which the lead terminals come into contact with component pads. CONSTITUTION: Solder paste 10a or 10b is printed to the front and rear sides of points at which V-shaped (T-shaped) lead frames 5 come into contact with component pads 3. Namely, the solder paste 10a and 10b are alternately arranged against the lead frames 5 arranged in a line and the solder paste is reflowed. Therefore, visual and optical appearance inspections of soldered components can be performed easily, because heel fillets are formed on the front side of the frames 5. In addition, the formation of bridges between the solder paste 10a and 10b can be prevented, because the paste 10a and 10b are alternately printed on the front side and rear side of the frames 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は表面実装部品リード端子
の半田付け方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for soldering lead terminals of surface mount components.

【0002】[0002]

【従来の技術】従来、表面実装部品は、図4に示すよう
に、部品のボディ1から突き出たガルウィング形リード
フレーム2を有していた。このリードフレームの半田付
けを行う場合には図6に示すように、基板4上の部品パ
ッド3に半田ペースト10の印刷を行う。半田ペースト
10の上にガルウィング形リードフレーム2の搭載を行
い、半田付けを行うため半田リフローを行う。半田リフ
ローを行うために熱を加えるが、この熱によって半田溶
融前に半田ペースト10がブリッジ11を起しやすく、
半田付け後でもこのブリッジ11が存在し不良となる。
ガルウィング形リードフレーム2に形成される半田付け
フィレットは図5に示すように、トウフィレット8とヒ
ールフィレット9とである。半田量が最も多いヒールフ
ィレット9は死角になってしまい見ることができず、ト
ウフィレット8はフィレット高さhが小さいため、光源
6とCCDカメラ7とを用いた光学式外観検査でも、半
田不足,半田漏れ不良,半田ブリッジ等の不良を検出す
るのが困難であった。ガルウィング形リードフレーム2
においては、半田付け強度を最も左右するヒールフィレ
ット9がファインピッチになるに従ってフィレットの形
成が不安定になり、半田付け強度の保障が困難となって
いた。
2. Description of the Related Art Conventionally, a surface mount component has a gull wing type lead frame 2 protruding from a body 1 of the component as shown in FIG. When soldering the lead frame, the solder paste 10 is printed on the component pads 3 on the substrate 4, as shown in FIG. The gull-wing type lead frame 2 is mounted on the solder paste 10, and solder reflow is performed for soldering. Heat is applied to perform solder reflow, but this heat causes the solder paste 10 to easily cause the bridge 11 before melting the solder,
Even after soldering, the bridge 11 exists and becomes defective.
The solder fillets formed on the gull wing type lead frame 2 are a toe fillet 8 and a heel fillet 9 as shown in FIG. Since the heel fillet 9 having the largest amount of solder becomes a blind spot and cannot be seen, and the toe fillet 8 has a small fillet height h, the optical appearance inspection using the light source 6 and the CCD camera 7 causes insufficient solder. It was difficult to detect defects such as solder leak defects and solder bridges. Gull wing type lead frame 2
In this case, as the heel fillet 9, which most affects the soldering strength, becomes finer, the formation of the fillet becomes unstable as the pitch becomes finer, and it is difficult to secure the soldering strength.

【0003】[0003]

【発明が解決しようとする課題】従来のガルウィング形
リードフレーム2では、ヒールフィレットがリードフレ
ームの後側に形成されるため、リードピッチが狭くなる
と目視,CCDカメラを用いた光学式による半田付け外
観検査が困難であった。また半田量が最も多いヒールフ
ィレットがリードフレームの後側にあるだけに隣接して
おり、半田ブリッジを起しやすい問題があった。
In the conventional gull wing type lead frame 2, since the heel fillet is formed on the rear side of the lead frame, when the lead pitch becomes narrow, it is visually observed, and the appearance of soldering by an optical method using a CCD camera is performed. The inspection was difficult. Further, the heel fillet having the largest amount of solder is adjacent only to the rear side of the lead frame, so that there is a problem that a solder bridge is easily generated.

【0004】[0004]

【課題を解決するための手段】本発明の表面実装部品リ
ード端子の半田付け方法は、表面実装部品のボディより
外方に延在し相並ぶV形またはJ形のリード端子を基板
の部品パッドに予め設置した半田ペースト上に実装し、
半田リフローにより半田付けするとき、前記リード端子
が前記部品パッドに接触するV形またはJ形の曲折箇所
を境界にして前記半田ペーストを前記リード端子の外方
及び内方位置のいずれかに対応するように交互配置する
構成である。
According to the present invention, there is provided a method of soldering a lead terminal of a surface mount component, wherein V and J lead terminals extending outside the body of the surface mount component are arranged side by side. Mounted on the solder paste previously set in the
When soldering by solder reflow, the solder paste corresponds to any one of the outer and inner positions of the lead terminal with a V-shaped or J-shaped bent portion where the lead terminal contacts the component pad as a boundary. In such a manner that they are alternately arranged.

【0005】[0005]

【実施例】次に本発明について図面を参照して説明す
る。
The present invention will be described below with reference to the drawings.

【0006】図1は本発明の一実施例における表面実装
部品のリードフレーム5を示す。ボディ1から外側に突
き出たリードが基板4上の部品パッド3に接するように
VまたはJ形に成形されている。
FIG. 1 shows a lead frame 5 of a surface mount component according to an embodiment of the present invention. The lead protruding outward from the body 1 is formed in a V or J shape so as to contact the component pad 3 on the substrate 4.

【0007】図2はリードフレーム5の半田付け外観を
示す。半田付け後は、リードフレーム5の前後にヒール
フィレット9a,9bがそれぞれ形成される。従来のガ
ルウィング形リードフレームは、半田量が最も多いヒー
ルフィレットが死角となってしまい、目視,光学式の半
田付け外観検査は困難であった。アウトラインV(J)
形リードフレーム5では、十分なだけのフィレット高さ
hを有するヒールフィレット9aがリードフレーム5の
前側に形成されるので、目視,光学式の半田付け外観検
査が容易である。
FIG. 2 shows the appearance of soldering the lead frame 5. After soldering, heel fillets 9a and 9b are formed before and after the lead frame 5, respectively. In the conventional gull-wing type lead frame, the heel fillet having the largest amount of solder becomes a blind spot, and it is difficult to visually inspect and optically inspect the soldering appearance. Outline V (J)
In the lead frame 5, since the heel fillet 9a having a sufficient fillet height h is formed on the front side of the lead frame 5, visual and optical soldering appearance inspection is easy.

【0008】図3は半田リフロー前のリードフレーム5
と半田ペースト10a,10bとの配置関係を示す。V
(J)形リードフレーム5の部品パッド3への接触点を
境にして前後に半田ペースト10aまたは10bを印刷
する。つまり、相並ぶリードフレーム5に対して上述し
たように半田ペースト10a,10bを交互に配置して
半田リフローする。これにより、半田ブリッジを防止す
ることができる。
FIG. 3 shows a lead frame 5 before solder reflow.
2 shows an arrangement relationship between the solder pastes 10a and 10b. V
(J) The solder paste 10a or 10b is printed before and after the contact point of the lead frame 5 with the component pad 3. That is, as described above, the solder pastes 10a and 10b are alternately arranged on the lead frames 5 arranged side by side, and the solder reflow is performed. This can prevent solder bridging.

【0009】[0009]

【発明の効果】以上のように、この発明によれば、リー
ドフレーム(リード端子)形状をVまたはJ形にするこ
とで目視可能なヒールフィレットがリードフレームの前
側に形成されるため目視,光学式の半田付け外観検査が
容易になる。また、リードフレームに対して前後に半田
ペーストを印刷することで半田ペーストのブリッジを防
ぐことができる。
As described above, according to the present invention, since the visible heel fillet is formed on the front side of the lead frame (lead terminal) by making the shape of the lead frame (lead terminal) V or J, it is possible to perform visual and optical inspection. -Type soldering visual inspection becomes easy. Also, by printing the solder paste on the lead frame before and after, the bridge of the solder paste can be prevented.

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

【図1】本発明の一実施例におけるリードフレーム形状
を示す。
FIG. 1 shows a lead frame shape according to an embodiment of the present invention.

【図2】図1に示したリードフレームの外観検査及び半
田付け後の状態を示す。
FIG. 2 shows a state after appearance inspection and soldering of the lead frame shown in FIG. 1;

【図3】図1に示したリードフレームを半田付けする前
の状態を示す。
FIG. 3 shows a state before soldering the lead frame shown in FIG. 1;

【図4】従来のリードフレーム形状を示す。FIG. 4 shows a conventional lead frame shape.

【図5】図4に示したリードフレームの外観検査及び半
田付け後の状態を示す。
FIG. 5 shows a state after the appearance inspection and soldering of the lead frame shown in FIG. 4;

【図6】図4に示したリードフレームを半田付けする前
の状態を示す。
FIG. 6 shows a state before the lead frame shown in FIG. 4 is soldered.

【符号の説明】 1 ボティ 2 ガルウィング形リードフレーム 3 部品パッド 4 基板 5 V(J)形リードフレーム 6 光源 7 CCDカメラ 8 トウフィレット 9,9a,9b ヒールフィレット 10,10a,10b 半田ペースト 11 半田ブリッジ[Explanation of symbols] 1 body 2 gull wing type lead frame 3 component pad 4 substrate 5 V (J) type lead frame 6 light source 7 CCD camera 8 toe fillet 9, 9a, 9b heel fillet 10, 10a, 10b solder paste 11 solder bridge

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 表面実装部品のボディより外方に延在し
相並ぶV形またはJ形のリード端子を基板の部品パッド
に予め設置した半田ペースト上に実装し、半田リフロー
により半田付けするとき、前記リード端子が前記部品パ
ッドに接触するV形またはJ形の曲折箇所を境界にして
前記半田ペーストを前記リード端子の外方及び内方位置
のいずれかに対応するように交互配置することを特徴と
する表面実装部品リード端子の半田付け方法。
1. When mounting V-shaped or J-shaped lead terminals, which extend outward from the body of surface-mounted components and are juxtaposed with each other, on a solder paste previously installed on component pads of a substrate and soldering by solder reflow And alternately arranging the solder paste so as to correspond to either an outer position or an inner position of the lead terminal with a V-shaped or J-shaped bent portion where the lead terminal contacts the component pad as a boundary. Characteristic Surface mounting component Lead terminal soldering method.
JP7069231A 1995-03-28 1995-03-28 Soldering method for lead terminals of surface mount components Expired - Lifetime JP2642079B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7069231A JP2642079B2 (en) 1995-03-28 1995-03-28 Soldering method for lead terminals of surface mount components

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7069231A JP2642079B2 (en) 1995-03-28 1995-03-28 Soldering method for lead terminals of surface mount components

Publications (2)

Publication Number Publication Date
JPH08264925A true JPH08264925A (en) 1996-10-11
JP2642079B2 JP2642079B2 (en) 1997-08-20

Family

ID=13396760

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7069231A Expired - Lifetime JP2642079B2 (en) 1995-03-28 1995-03-28 Soldering method for lead terminals of surface mount components

Country Status (1)

Country Link
JP (1) JP2642079B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62163392A (en) * 1986-01-14 1987-07-20 沖電気工業株式会社 Soldering of electronic parts
JPS63133873U (en) * 1987-02-23 1988-09-01

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62163392A (en) * 1986-01-14 1987-07-20 沖電気工業株式会社 Soldering of electronic parts
JPS63133873U (en) * 1987-02-23 1988-09-01

Also Published As

Publication number Publication date
JP2642079B2 (en) 1997-08-20

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Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 19970318