JP6832594B2 - Lead wire terminal of chip type electrolytic capacitor - Google Patents

Lead wire terminal of chip type electrolytic capacitor Download PDF

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JP6832594B2
JP6832594B2 JP2019215148A JP2019215148A JP6832594B2 JP 6832594 B2 JP6832594 B2 JP 6832594B2 JP 2019215148 A JP2019215148 A JP 2019215148A JP 2019215148 A JP2019215148 A JP 2019215148A JP 6832594 B2 JP6832594 B2 JP 6832594B2
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metal wire
lead
terminal
electrolytic capacitor
type electrolytic
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JP2020031241A (en
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学 山▲崎▼
学 山▲崎▼
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Kohoku Kogyo Co Ltd
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Description

本発明は、チップ型電解コンデンサのリード線端子に関する。 The present invention relates to a lead wire terminal of a chip type electrolytic capacitor.

チップ型電解コンデンサのリード線端子は、回路基板に半田付けされるリード部と、その一端に設けられた端子部とを有している。 The lead wire terminal of the chip type electrolytic capacitor has a lead portion soldered to a circuit board and a terminal portion provided at one end thereof.

リード部は帯板状を呈しており、所定長さの金属線材をプレス加工することにより形成される(下記特許文献1)。 The lead portion has a strip-like shape and is formed by pressing a metal wire having a predetermined length (Patent Document 1 below).

このプレス加工は、コンデンサ素子を形成する電極箔に端子部が接続された状態で行われる。 This press working is performed in a state where the terminal portion is connected to the electrode foil forming the capacitor element.

また、リード部と回路基板との半田付け強度の信頼性を確保するために、リード部を形成する金属線材の外周に半田濡れ性が良好な被覆層(例えば、錫メッキ層)が設けられている。 Further, in order to ensure the reliability of the soldering strength between the lead portion and the circuit board, a coating layer (for example, a tin-plated layer) having good solder wettability is provided on the outer periphery of the metal wire rod forming the lead portion. There is.

特開平9−17694号公報JP-A-9-17694

従来、リード部を形成するプレス加工の際に発生する金属屑により種々の不具合が発生するという問題があった。 Conventionally, there has been a problem that various problems occur due to metal scraps generated during press working to form a lead portion.

すなわち、図5に示すように、金属線材511は上型Uと下型Dの間でプレスされて帯板状に形成される。その際、金属線材511の外周に設けられた被覆層512の厚みは、プレス加工前には、図5(a)に示すように、全周にわたってほぼ均一であるが、プレス加工を行うと、被覆層512は比較的柔らかいため、図5(b)に示すように、金属線材511の中心部の上下の被覆層512の厚みが薄くなり、左右両側の被覆層512の厚みが厚くなる。 That is, as shown in FIG. 5, the metal wire rod 511 is pressed between the upper mold U and the lower mold D to form a strip. At that time, the thickness of the coating layer 512 provided on the outer periphery of the metal wire rod 511 is substantially uniform over the entire circumference as shown in FIG. 5A before the press working, but when the press working is performed, Since the coating layer 512 is relatively soft, as shown in FIG. 5B, the thickness of the upper and lower coating layers 512 at the center of the metal wire 511 is reduced, and the thickness of the coating layers 512 on both the left and right sides is increased.

被覆層512がこのように変形することにより、被覆層512の一部が崩落して粉状の金属屑が発生することがある。金属線材511のプレス加工は、金属線材511の一端に設けられた端子部が電極箔に接続された状態で行われるため、完成した電解コンデンサに金属屑が付着して回路基板のショート等の不具合が発生する虞があった。 When the coating layer 512 is deformed in this way, a part of the coating layer 512 may collapse and powdery metal dust may be generated. Since the press working of the metal wire 511 is performed in a state where the terminal portion provided at one end of the metal wire 511 is connected to the electrode foil, metal scraps adhere to the completed electrolytic capacitor and defects such as a short circuit board are caused. Was likely to occur.

本発明は上記事情に鑑みて創案されたものであり、その目的は、チップ型電解コンデンサのリード線端子のリード部を形成するプレス加工の際に発生する金属屑による不具合を抑制することができるリード線端子を提供することにある。 The present invention was devised in view of the above circumstances, and an object of the present invention is to suppress defects caused by metal scraps generated during press working to form a lead portion of a lead wire terminal of a chip type electrolytic capacitor. The purpose is to provide lead wire terminals.

上記目的を達成するために、本発明は、チップ型電解コンデンサ1のコンデンサ素子3に接続されるリード線端子4であって、帯板状のリード部41と、その一端に接合されてコンデンサ素子3の電極箔に接続される端子部42とを有している。 In order to achieve the above object, the present invention is a lead wire terminal 4 connected to a capacitor element 3 of a chip type electrolytic capacitor 1, and is a strip-shaped lead portion 41 and a capacitor element joined to one end thereof. It has a terminal portion 42 connected to the electrode foil of 3.

リード部41は、外周に半田濡れ性が良好な被覆層412が設けられた金属線材411から成り、前記端子部42が前記電極箔に接続される前の状態で前記金属線材411が帯板状にプレスされて形成され、前記リード部41の両面がプレス加工時における被押圧面であることを特徴とする。 The lead portion 41 is made of a metal wire rod 411 provided with a coating layer 412 having good solder wettability on the outer periphery thereof, and the metal wire rod 411 has a strip shape before the terminal portion 42 is connected to the electrode foil. It is characterized in that both surfaces of the lead portion 41 are pressed surfaces during press working.

本発明によれば、チップ型電解コンデンサのリード線端子のリード部を形成するプレス加工の際に発生する金属屑による不具合を抑制することができる。 According to the present invention, it is possible to suppress a defect due to metal scraps generated during press working to form a lead portion of a lead wire terminal of a chip type electrolytic capacitor.

実施形態の製造方法により製造されるチップ型電解コンデンサの斜視図である。It is a perspective view of the chip type electrolytic capacitor manufactured by the manufacturing method of embodiment. 図1のチップ型電解コンデンサの縦断面図である。It is a vertical sectional view of the chip type electrolytic capacitor of FIG. 実施形態の製造方法の説明図である。It is explanatory drawing of the manufacturing method of embodiment. 実施形態の製造方法の説明図である。It is explanatory drawing of the manufacturing method of embodiment. 従来技術の問題点の説明図である。It is explanatory drawing of the problem of the prior art.

以下、図面を参照して本発明の実施形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図1及び図2に示すように、本実施形態の製造方法により製造されるチップ型電解コンデンサ1は、有底筒状の容器2と、この容器2内に収容されたコンデンサ素子3と、このコンデンサ素子3に接続された一対のリード線端子4と、容器2の開口部を封閉する封口部材5と、容器2の開口端側に設けられた座板6とを備えている。 As shown in FIGS. 1 and 2, the chip-type electrolytic capacitor 1 manufactured by the manufacturing method of the present embodiment includes a bottomed tubular container 2, a capacitor element 3 housed in the container 2, and the same. It includes a pair of lead wire terminals 4 connected to the capacitor element 3, a sealing member 5 for closing the opening of the container 2, and a seat plate 6 provided on the opening end side of the container 2.

容器2は金属製の薄板をプレス加工することにより形成され、開口端が内方に折曲されて封口部材5を固定支持している。 The container 2 is formed by pressing a thin metal plate, and the opening end is bent inward to fix and support the sealing member 5.

コンデンサ素子3は、陽極側の電極箔と陰極側の電極箔とセパレータとを重ねてロール状に巻回することにより形成される。 The capacitor element 3 is formed by stacking an electrode foil on the anode side, an electrode foil on the cathode side, and a separator and winding them in a roll shape.

リード線端子4は、L字形に折曲された帯板状のリード部41を有しており、その一端には端子部42が設けられている。 The lead wire terminal 4 has a strip-shaped lead portion 41 bent in an L shape, and a terminal portion 42 is provided at one end thereof.

リード部41は、断面四角形の金属線材を軸線と直交する方向にプレス加工することにより帯板状に形成される。 The lead portion 41 is formed in a strip shape by pressing a metal wire having a quadrangular cross section in a direction orthogonal to the axis.

この金属線材は長尺のCP線(銅被覆鋼線)等を所定長さに切断したものであって、その外周には、半田濡れ性を良好にするために、錫メッキ等から成る被覆層が設けられている。 This metal wire is obtained by cutting a long CP wire (copper-coated steel wire) or the like to a predetermined length, and a coating layer made of tin plating or the like is formed on the outer periphery thereof in order to improve solder wettability. Is provided.

端子部42は、アルミニウム等から成る棒状部材をプレス加工することにより形成され、図3に示すように、一端に 扁平部421を有している。 The terminal portion 42 is formed by pressing a rod-shaped member made of aluminum or the like, and has a flat portion 421 at one end as shown in FIG.

端子部42の一端には、溶接等によって金属線材411が接続され、この金属線材411はプレス加工されてリード部41が形成される。 A metal wire 411 is connected to one end of the terminal portion 42 by welding or the like, and the metal wire 411 is pressed to form a lead portion 41.

そして、端子部42が帯状の電極箔に接続され、陽極側の電極箔と陰極側の電極箔と2枚のセパレータ31とがロール状に巻回されてコンデンサ素子3が形成される。 Then, the terminal portion 42 is connected to the strip-shaped electrode foil, and the electrode foil on the anode side, the electrode foil on the cathode side, and the two separators 31 are wound in a roll shape to form the capacitor element 3.

封口部材5はゴム等により形成され、端子部42を挿通する一対の貫通孔51を有している。 The sealing member 5 is made of rubber or the like, and has a pair of through holes 51 through which the terminal portion 42 is inserted.

座板6は絶縁性材料により形成され、容器2の開口端に接着等により固定される。 The seat plate 6 is formed of an insulating material and is fixed to the open end of the container 2 by adhesion or the like.

座板6は、リード部41を挿通する一対の貫通孔61と、この貫通孔61に連通する一対の溝62とを有する。 The seat plate 6 has a pair of through holes 61 through which the lead portion 41 is inserted, and a pair of grooves 62 that communicate with the through holes 61.

各リード部41は、貫通孔61に挿通された後、互いに離反する方向に折曲されて溝62に収容される。 After being inserted into the through hole 61, each lead portion 41 is bent in a direction away from each other and accommodated in the groove 62.

以上のように、本実施形態に係るチップ型電解コンデンサ1の製造方法は、以下の工程を包含している。
(a)外周に半田濡れ性が良好な被覆層412が設けられた所定長さの金属線材411を準備する工程。
(b)金属線材411をプレス加工してリード部41を形成する工程。
(c)コンデンサ素子3の電極箔にリード線端子4の端子部42を接続する工程。
As described above, the method for manufacturing the chip type electrolytic capacitor 1 according to the present embodiment includes the following steps.
(A) A step of preparing a metal wire rod 411 having a predetermined length provided with a coating layer 412 having good solder wettability on the outer periphery.
(B) A step of pressing the metal wire rod 411 to form a lead portion 41.
(C) A step of connecting the terminal portion 42 of the lead wire terminal 4 to the electrode foil of the capacitor element 3.

このように、端子部42が電極箔に接続される前の状態で金属線材411をプレス加工してリード部41を形成し、その後に端子部42を電極箔に接続することで、リード部41のプレス加工の際に発生する金属屑をリード線端子4から十分に除去した後に端子部42を電極箔に接続することができる。 In this way, the metal wire rod 411 is press-processed to form the lead portion 41 before the terminal portion 42 is connected to the electrode foil, and then the terminal portion 42 is connected to the electrode foil to form the lead portion 41. The terminal portion 42 can be connected to the electrode foil after the metal debris generated during the press working of the above is sufficiently removed from the lead wire terminal 4.

したがって、完成したチップ型電解コンデンサ1に金属屑が付着しにくくなり、この金属屑による不具合(回路基板のショート等)の発生を抑制することができる。 Therefore, metal debris is less likely to adhere to the completed chip-type electrolytic capacitor 1, and it is possible to suppress the occurrence of defects (short circuit board, etc.) due to the metal debris.

なお、本実施形態では、断面四角形の金属線材411を使用しているため、断面円形の金属線材を使用する場合と比べて金属屑が発生しにくい。 In this embodiment, since the metal wire 411 having a quadrangular cross section is used, metal scraps are less likely to be generated as compared with the case where the metal wire having a circular cross section is used.

すなわち、リード部41をプレス加工する工程では、図4に示すように、金属線材411を上型Uと下型Dとの間でプレスするが、金属線材411は断面四角形であるため、その上下両面において、被覆層412の厚みが略均一となる。 That is, in the step of pressing the lead portion 41, as shown in FIG. 4, the metal wire rod 411 is pressed between the upper mold U and the lower mold D, but since the metal wire rod 411 has a quadrangular cross section, it is above and below it. The thickness of the coating layer 412 becomes substantially uniform on both sides.

したがって、図5に示される断面円形の金属線材511と比べて、被覆層412の厚みのばらつきが少なくなるため、金属線411の左右両側で金属屑が発生しにくくなり、回路基板のショートやコンデンサ特性の低下が発生しにくい。 Therefore, as compared with the metal wire 511 having a circular cross section shown in FIG. 5, the variation in the thickness of the coating layer 412 is reduced, so that metal scraps are less likely to be generated on both the left and right sides of the metal wire 411, resulting in a short circuit board or a capacitor. Deterioration of characteristics is unlikely to occur.

また、被覆層412の厚みのばらつきが少なくなると、半田濡れ性が局部的に低下するのを抑制することができるため、回路基板に対するリード部41の半田付け強度の信頼性も向上する。 Further, when the variation in the thickness of the coating layer 412 is reduced, it is possible to suppress the local decrease in the solder wettability, so that the reliability of the soldering strength of the lead portion 41 with respect to the circuit board is also improved.

このような効果は、金属線材411の断面形状が四角形以外の多角形(例えば六角形)の場合でも得ることができる。 Such an effect can be obtained even when the cross-sectional shape of the metal wire rod 411 is a polygon other than a quadrangle (for example, a hexagon).

なお、本発明は上記実施形態に限定されるものではない。例えば、リード部41を形成する金属線材411の断面形状は四角形以外の形状でもよい。また、金属線材411はCP線以外の素材で形成してもよい。また、錫メッキから成る被覆層412に代えて、半田濡れ性が良好な他の材料から成る被覆層を金属線材411の外周に設けてもよい。 The present invention is not limited to the above embodiment. For example, the cross-sectional shape of the metal wire rod 411 forming the lead portion 41 may be a shape other than a quadrangle. Further, the metal wire rod 411 may be formed of a material other than the CP wire. Further, instead of the coating layer 412 made of tin plating, a coating layer made of another material having good solder wettability may be provided on the outer periphery of the metal wire rod 411.

その他にも、本発明の要旨を逸脱しない範囲で上記の実施形態に種々の改変を施すことができる。 In addition, various modifications can be made to the above embodiment without departing from the gist of the present invention.

1 チップ型電解コンデンサ
4 リード線端子
41 リード部
42 端子部
411 金属線材
412 被覆層
1 Chip type electrolytic capacitor 4 Lead wire terminal 41 Lead part 42 Terminal part 411 Metal wire rod 412 Coating layer

Claims (2)

チップ型電解コンデンサ(1)のコンデンサ素子(3)に接続されるリード線端子(4)であって、
帯板状のリード部(41)と、その一端に接合されて前記コンデンサ素子(3)の電極箔に接続される端子部(42)とを有し、
前記リード部(41)は、外周に半田濡れ性が良好な被覆層(412)が設けられた金属線材(411)から成り、前記端子部(42)が前記電極箔に接続される前の状態で前記金属線材(411)が帯板状にプレスされて形成され、前記リード部(41)の両面がプレス加工時における被押圧面であるリード線端子。
A lead wire terminal (4) connected to a capacitor element (3) of a chip-type electrolytic capacitor (1).
It has a strip-shaped lead portion (41) and a terminal portion (42) joined to one end thereof and connected to the electrode foil of the capacitor element (3).
The lead portion (41) is made of a metal wire rod (411) provided with a coating layer (412) having good solder wettability on the outer periphery thereof, and is in a state before the terminal portion (42) is connected to the electrode foil. A lead wire terminal formed by pressing the metal wire rod (411) into a strip shape, and both sides of the lead portion (41) are pressed surfaces during press working.
前記金属線材(411)が断面多角形状である請求項1記載のリード線端子。 The lead wire terminal according to claim 1, wherein the metal wire rod (411) has a polygonal cross section.
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JPS58191630U (en) * 1982-06-16 1983-12-20 松下電器産業株式会社 electronic components
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JP2965588B2 (en) * 1989-10-02 1999-10-18 ニチコン株式会社 Surface mount electrolytic capacitors
JP3289321B2 (en) * 1992-07-07 2002-06-04 松下電器産業株式会社 Chip type aluminum electrolytic capacitor
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