JP2005033042A - Printed board - Google Patents

Printed board Download PDF

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Publication number
JP2005033042A
JP2005033042A JP2003271678A JP2003271678A JP2005033042A JP 2005033042 A JP2005033042 A JP 2005033042A JP 2003271678 A JP2003271678 A JP 2003271678A JP 2003271678 A JP2003271678 A JP 2003271678A JP 2005033042 A JP2005033042 A JP 2005033042A
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Prior art keywords
solder
land
printed wiring
wiring board
land portion
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JP2003271678A
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Japanese (ja)
Inventor
Yoshihiro Tanada
好広 棚田
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RB Controls Co Ltd
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RB Controls Co Ltd
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Application filed by RB Controls Co Ltd filed Critical RB Controls Co Ltd
Priority to JP2003271678A priority Critical patent/JP2005033042A/en
Publication of JP2005033042A publication Critical patent/JP2005033042A/en
Withdrawn legal-status Critical Current

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  • Structure Of Printed Boards (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that solder on a land is drawn back to the solder tank side at the time of separating a printed board from the solder tank in the case of forming a through hole on the center of a conventional circular land, and performing flow soldering in the projected state of a lead wire from the through hole and solder of sufficient quantity can not be left on the land. <P>SOLUTION: A circular slit 21 is formed on the land 2 to divide the land 2 into an inside 22 and an outside 23, and the areas of respective parts 22, 23 are reduced to increase surface tension so that solder is not drawn back to the solder tank side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、電子部品のリード線をフローハンダ方式によってランド部にハンダ付けするプリント配線板に関する。   The present invention relates to a printed wiring board for soldering a lead wire of an electronic component to a land portion by a flow solder method.

従来のプリント配線板では、プリント配線板の一方の面に銅箔等により配線パターンを形成し、更にその配線パターンの所定の部分にランド部を設けている。そして、ランド部の中心部分にプリント配線板を貫通するスルーホールを形成している(特許文献1及び特許文献2参照)。   In a conventional printed wiring board, a wiring pattern is formed on one surface of the printed wiring board using copper foil or the like, and a land portion is provided at a predetermined portion of the wiring pattern. And the through-hole which penetrates a printed wiring board is formed in the center part of a land part (refer patent document 1 and patent document 2).

プリント配線板の他方の面側から電子部品のリード線をスルーホールに挿通し、ランド部側に突出させた状態で、ランド部とリード線とを相互にハンダ付けしている。このハンダ付けの方法として、各ランド部毎に手作業でハンダ付けをするとハンダ付け作業に多くの工数を必要とするので、フローハンダと呼ばれるハンダ付けが行われる。   The lead wire of the electronic component is inserted into the through hole from the other surface side of the printed wiring board and protruded to the land portion side, and the land portion and the lead wire are soldered to each other. As a soldering method, if soldering is performed manually for each land portion, a lot of man-hours are required for the soldering work, so soldering called flow soldering is performed.

フローハンダとは溶融したハンダを常にオーバーフローさせているハンダ槽の上面に配線パターンが形成されている側の面を下にしてプリント配線板を所定の速度で流し、プリント配線板の下面に溶融したハンダを接触させることによりランド部やリード線にハンダを被着させるものである。
特開2001−326443号公報 特開2002−290019号公報
With flow solder, the molten solder is always overflowed. The surface of the solder tank on the side where the wiring pattern is formed on the upper surface of the solder tank is flowed at a predetermined speed, and the molten solder is melted on the lower surface of the printed wiring board. The solder is attached to the land portion or the lead wire by contacting the solder.
JP 2001-326443 A JP 2002-290019 A

フローハンダ方式でハンダ付けを行うと、溶融したハンダに接触している間にハンダがランド部及びリード線に付着するが、ハンダ槽からプリント配線板が離脱する際に溶融状態のハンダの一部がランド部に残留せずハンダ槽側に引き戻される現象が発生する。すると、図3に示すようにランド部上に十分な量のハンダを盛ることができない。そのため矢印で示した部分のハンダの厚みが薄くなる。   When soldering with the flow solder method, the solder adheres to the land and the lead wire while it is in contact with the molten solder, but part of the molten solder when the printed wiring board is removed from the solder bath Does not remain in the land portion but is pulled back to the solder tank side. Then, as shown in FIG. 3, a sufficient amount of solder cannot be deposited on the land portion. Therefore, the thickness of the solder of the part shown with the arrow becomes thin.

ハンダ付けが終了したプリント配線板は耐久試験の一種であるヒートショック試験を受ける。このヒートショック試験とはハンダ付けされたプリント配線板を一旦加熱したあと急冷するというサイクルを繰り返して異常が生じないかを見る試験である。   The printed wiring board after soldering is subjected to a heat shock test which is a kind of durability test. This heat shock test is a test in which a cycle in which a soldered printed wiring board is once heated and then rapidly cooled is repeated to check whether an abnormality occurs.

上述の図3に示すように、ハンダの厚みが薄くなっていると、このヒートショック試験時にハンダに割れが発生するという不具合が生じる。そのため、フローハンダを終了したプリント配線板を目視で検査し、ハンダの厚みが薄いランド部については手作業でハンダを盛る修正を施している。   As shown in FIG. 3 described above, when the thickness of the solder is thin, there is a problem that the solder is cracked during the heat shock test. Therefore, the printed wiring board which finished the flow solder is visually inspected, and the land portion where the thickness of the solder is thin is corrected by manually placing the solder.

なお、ランド部の直径を小さくすると、図4に示すように、ハンダは表面張力で盛り上がり、ヒートショックに耐え得るだけの十分な厚みを確保することができる。但し、ランド部の直径が小さいので、比較的重量の重い電子部品を取り付けた場合等に、リード線に対して矢印で示す方向の外力が作用すると、ランド部がプリント配線板から剥がれるおそれが生じる。   When the diameter of the land portion is reduced, as shown in FIG. 4, the solder rises due to the surface tension and can secure a sufficient thickness to withstand heat shock. However, since the diameter of the land portion is small, when an external force in the direction indicated by the arrow acts on the lead wire when a relatively heavy electronic component is attached, the land portion may be peeled off from the printed wiring board. .

そこで本発明は、上記の問題点に鑑み、上記の不具合が生じないプリント配線板を提供することを課題とする。   Then, this invention makes it a subject to provide the printed wiring board which does not produce said malfunction in view of said problem.

上記課題を解決するために本発明によるプリント配線板は、フローハンダ方式によってハンダ付けされるプリント配線板であって、金属箔からなり中心位置にリード線が挿通されるスルーホールが形成されたランド部を表面に備えたプリント配線板において、上記ランド部に、スルーホールを囲うように、金属箔が存在しない環状のスリット部を形成したことを特徴とする。   In order to solve the above problems, a printed wiring board according to the present invention is a printed wiring board that is soldered by a flow solder method, and is formed of a metal foil and has a land formed with a through hole through which a lead wire is inserted at a central position. In the printed wiring board having a portion on the surface, an annular slit portion having no metal foil is formed in the land portion so as to surround the through hole.

フローハンダを行う場合に、ハンダ槽からプリント配線板が離脱する際に、スリット部で分割されたランド部の内側部分と外側部分とに各々表面張力が作用して、ハンダ槽の上面を流れている間にランド部に付着したハンダが、プリント配線板がハンダ槽から離脱する際にハンダ槽へ戻されることを防止する。そのためハンダ槽から離脱したランド部には多量のハンダが残留し、ハンダの厚みを確保することができる。   When performing flow soldering, when the printed wiring board is detached from the solder tank, surface tension acts on the inner part and the outer part of the land part divided by the slit part to flow over the upper surface of the solder tank. During this time, the solder adhered to the land portion is prevented from returning to the solder tank when the printed wiring board is detached from the solder tank. Therefore, a large amount of solder remains in the land portion separated from the solder tank, and the thickness of the solder can be secured.

なお、プリント配線板に特にスリット部を設けなくてもよいランド部を混在して設ける場合には、スリット部を有するランド部の外形とランド部を有さないランド部の外形とをほぼ同一にすることが望ましい。   When the printed wiring board is provided with a land portion that does not require a slit portion, the outer shape of the land portion having the slit portion and the outer shape of the land portion having no land portion are substantially the same. It is desirable to do.

本発明によるプリント配線板によれば、十分な大きさの外形のランド部にフローハンダ方式にてハンダ付けする際に多量のハンダを残留させることができるので、手作業で修正することなく、ヒートショックに強く、かつリード線に外力が作用してもランド部がプリント配線板から剥がれるおそれがない。   According to the printed wiring board according to the present invention, a large amount of solder can be left when soldering to a land portion having a sufficiently large outer shape by the flow solder method, so that heat can be corrected without manual correction. It is strong against shock and there is no possibility that the land part will be peeled off from the printed wiring board even if an external force is applied to the lead wire.

図1及び図2を参照して、1は本発明によるプリント配線板の一形態である。このプリント配線板1の一方の表面には、エッチングにより形成された銅箔による配線パターン11が形成されている。この配線パターン11にはプリント配線板1の他方の面にセットされる電子部品のリード線4を接続する必要がある。   Referring to FIGS. 1 and 2, reference numeral 1 denotes one form of a printed wiring board according to the present invention. On one surface of the printed wiring board 1, a wiring pattern 11 made of copper foil formed by etching is formed. It is necessary to connect the lead wire 4 of the electronic component set on the other surface of the printed wiring board 1 to the wiring pattern 11.

そこで、配線パターン11の所定の位置に同じく銅箔による円形のランド部2を、配線パターン11に対して一体に形成している。そして、このランド部2の中心部分にはプリント配線板1の両面を貫通するスルーホール3が形成されている。したがって、プリント配線板1の他方の面である下面からリード線4を挿通すると、リード線4の先端は図示のようにランド部2の中心に突出することになる。   Therefore, a circular land 2 made of copper foil is formed integrally with the wiring pattern 11 at a predetermined position of the wiring pattern 11. A through hole 3 penetrating both surfaces of the printed wiring board 1 is formed at the center of the land portion 2. Therefore, when the lead wire 4 is inserted from the lower surface which is the other surface of the printed wiring board 1, the tip of the lead wire 4 protrudes to the center of the land portion 2 as shown.

そして、本発明ではランド部2にスルーホールを囲む環状のスリット部21を形成した。このスリット部によってランド部2はスリット部21を挟んで内側部22と外側部23とに分割されることになる。   In the present invention, the annular slit portion 21 surrounding the through hole is formed in the land portion 2. By this slit portion, the land portion 2 is divided into an inner portion 22 and an outer portion 23 with the slit portion 21 interposed therebetween.

プリント配線板1の他方の面にすべての部品をセットし、各スルーホール3からリード線4を突出させた状態で、プリント配線板1の姿勢を図示の状態から上下反転させて、配線パターン11が形成されている面を下にしてフローハンダを行う。   With all components set on the other surface of the printed wiring board 1 and with the lead wires 4 protruding from the respective through holes 3, the posture of the printed wiring board 1 is turned upside down from the state shown in the figure to form a wiring pattern 11. Flow soldering is performed with the surface on which is formed facing down.

配線パターン11やランド部2及びリード線4はハンダ槽内の溶融したハンダに対して濡れ性が高いので、フローハンダ時に溶融したハンダの表面に配線パターン11やランド部2及びリード線4が接触すると、ハンダはこれら配線パターン11やランド部2及びリード線4に付着する。   Since the wiring pattern 11, the land portion 2 and the lead wire 4 have high wettability to the molten solder in the solder bath, the wiring pattern 11, the land portion 2 and the lead wire 4 are in contact with the molten solder surface during flow soldering. Then, the solder adheres to the wiring pattern 11, the land portion 2 and the lead wire 4.

溶融したハンダに一定時間触れた後はプリント配線板1をハンダ槽から離脱させるが、従来の単なる円形のランド部であれば、ランド部の面積が比較的広いため一旦ランド部に付着したハンダがハンダ槽側のハンダに引き戻され、ランド部上には十分な量のハンダが残留しない。   After touching the melted solder for a certain period of time, the printed wiring board 1 is removed from the solder tank. However, in the case of a conventional circular land portion, the land area is relatively large, so that the solder once attached to the land portion is removed. The solder is pulled back to the solder tank side, and a sufficient amount of solder does not remain on the land portion.

ところが、本発明ではスリット部21によってランド部2が内側部22と外側部23とに分割され、各々の面積が狭くなっているので、内側部22と外側部23に付着したハンダ5には大きな表面張力が作用して、各々にハンダが盛り上がる状態で残留してハンダ槽側へハンダ5が引き戻されることを防止する。   However, in the present invention, the land portion 2 is divided into the inner portion 22 and the outer portion 23 by the slit portion 21 and the respective areas are narrowed. Therefore, the solder 5 attached to the inner portion 22 and the outer portion 23 is large. The surface tension acts to prevent the solder 5 from being pulled back to the solder tank side by remaining in a state where the solder is raised.

このようにして内側部22と外側部23とに各々多量のハンダ5が残留するとスリット部21を介して対峙する内外のハンダ5は相互に相手側に膨らみ、互いに接触して一体になる。そのため、図2に示すように、ハンダ5はスリット部21を跨いでブリッジを形成し、冷却固化後には完全にスリット部21を覆い隠す状態になる。   When a large amount of solder 5 remains on the inner portion 22 and the outer portion 23 in this way, the inner and outer solders 5 that face each other through the slit portion 21 swell to each other and come into contact with each other to be integrated. Therefore, as shown in FIG. 2, the solder 5 forms a bridge across the slit portion 21 and completely covers the slit portion 21 after being cooled and solidified.

なお、本発明によるプリント配線板は、上記した形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更してもかまわない。   In addition, the printed wiring board by this invention is not limited to an above-described form, You may change variously within the range which does not deviate from the summary of this invention.

本発明は、特にフローハンダを行うプリント配線板に最適のものである。   The present invention is particularly suitable for printed wiring boards that perform flow soldering.

本発明のランド部を示す斜視図The perspective view which shows the land part of this invention 図1の断面図Sectional view of FIG. 従来のハンダ付け後を示す断面図Cross-sectional view after conventional soldering 従来の他の形態でのハンダ付け後を示す断面図Sectional view showing after soldering in another conventional form

符号の説明Explanation of symbols

1 プリント配線板
2 ランド部
3 スルーホール
4 リード線
5 ハンダ
11 配線パターン
21 スリット部
DESCRIPTION OF SYMBOLS 1 Printed wiring board 2 Land part 3 Through hole 4 Lead wire 5 Solder 11 Wiring pattern 21 Slit part

Claims (2)

フローハンダ方式によってハンダ付けされるプリント配線板であって、金属箔からなり中心位置にリード線が挿通されるスルーホールが形成されたランド部を表面に備えたプリント配線板において、上記ランド部に、スルーホールを囲うように、金属箔が存在しない環状のスリット部を形成したことを特徴とするプリント配線板。   A printed wiring board to be soldered by a flow solder method, wherein the land portion has a land portion formed with a through hole through which a lead wire is inserted at a central position. A printed wiring board, characterized in that an annular slit portion having no metal foil is formed so as to surround the through hole. スリット部を有さないランド部を備え、スリット部を有するランド部の外形とランド部を有さないランド部の外形とをほぼ同一にしたことを特徴とする請求項1に記載のプリント配線板。   The printed wiring board according to claim 1, further comprising a land portion having no slit portion, wherein an outer shape of the land portion having the slit portion is substantially the same as an outer shape of the land portion having no land portion. .
JP2003271678A 2003-07-08 2003-07-08 Printed board Withdrawn JP2005033042A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007146580A1 (en) * 2006-06-08 2007-12-21 Sandisk Corporation Printed circuit board with coextensive electrical connectors and contact pad areas
CN102376681A (en) * 2010-08-06 2012-03-14 联发科技股份有限公司 Package substrate
JP2013109927A (en) * 2011-11-18 2013-06-06 Sumitomo Electric Ind Ltd Battery wiring module, method of manufacturing the same, and power supply device having battery wiring module

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007146580A1 (en) * 2006-06-08 2007-12-21 Sandisk Corporation Printed circuit board with coextensive electrical connectors and contact pad areas
US7746661B2 (en) 2006-06-08 2010-06-29 Sandisk Corporation Printed circuit board with coextensive electrical connectors and contact pad areas
US8217522B2 (en) 2006-06-08 2012-07-10 Sandisk Technologies Inc. Printed circuit board with coextensive electrical connectors and contact pad areas
US9006912B2 (en) 2006-06-08 2015-04-14 Sandisk Technologies Inc. Printed circuit board with coextensive electrical connectors and contact pad areas
US10051733B2 (en) 2006-06-08 2018-08-14 Sandisk Technologies Inc. Printed circuit board with coextensive electrical connectors and contact pad areas
CN102376681A (en) * 2010-08-06 2012-03-14 联发科技股份有限公司 Package substrate
US10354970B2 (en) 2010-08-06 2019-07-16 Mediatek Inc. Flip chip package utilizing trace bump trace interconnection
US10707183B2 (en) 2010-08-06 2020-07-07 Mediatek Inc. Flip chip package utilizing trace bump trace interconnection
US11121108B2 (en) 2010-08-06 2021-09-14 Mediatek Inc. Flip chip package utilizing trace bump trace interconnection
JP2013109927A (en) * 2011-11-18 2013-06-06 Sumitomo Electric Ind Ltd Battery wiring module, method of manufacturing the same, and power supply device having battery wiring module

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