JP3777608B2 - Electronic component lead terminal structure - Google Patents

Electronic component lead terminal structure Download PDF

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Publication number
JP3777608B2
JP3777608B2 JP2002274074A JP2002274074A JP3777608B2 JP 3777608 B2 JP3777608 B2 JP 3777608B2 JP 2002274074 A JP2002274074 A JP 2002274074A JP 2002274074 A JP2002274074 A JP 2002274074A JP 3777608 B2 JP3777608 B2 JP 3777608B2
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Japan
Prior art keywords
lead terminal
electronic component
solder
circuit board
lead
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JP2002274074A
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Japanese (ja)
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JP2004111755A (en
Inventor
信一郎 三上
昌秀 荒垣
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Daishinku Corp
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Daishinku Corp
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Description

【0001】
【発明の属する技術分野】
本発明はリード端子の端子構造に関するものであり、例えば、電子部品の金属リード端子構造に関するものである。
【0002】
【従来の技術】
従来、特開2000−216517号では、2端子型電子部品のリード端子を折り曲げ、絶縁板を介して表面実装化した電子部品が開示されている。これを例にして説明する。
【0003】
電子部品は、電子部品素子が収納された電子部品本体と、電子部品素子を電気的に外部に導出する金属製のリード端子からなる。リード端子は、その断面が円形のみからなる構成、あるいはその断面が円形であり電子部品本体の導出部分から少し下方部分からは、プレス加工により平板状に加工され、平板部を形成している構成がある。プレス加工する場合、後述の折り曲げ方向に対して行われ、1つのリード端子に対して2つの可動ダイスにより両側からプレスし、リード端子に薄肉部分が形成され、平板状に構成される。そして、前記電子部品のリード端子に絶縁板を取り付け、当該絶縁板を介して、リード端子を折り曲げ、表面実装化する。
【0004】
【発明が解決しようとする課題】
上述のようなリード端子構成のうち、円形のみからなるリード端子では、回路基板の導電パターンとはんだにより接合される場合、平板化されたリード端子に比べて、はんだを介した回路基板との面接触領域が小さく、接合強度が低下する恐れがあった。さらに、金属リード端子を折り曲げる際に大きな力が必要となり、また折り曲げる際の方向性が出しにくいといった欠点があり、表面実装化するためにリード端子を折り曲げ加工する際の精度の向上が望まれていた。
【0005】
また、平板状に加工されたリード端子では、リード端子の平板部分(幅広部)で回路基板の導電パターンとはんだにより接合されるが、回路基板からリード端子にかけて形成されるはんだ這い上がりが十分に形成されず、接合強度が低下する恐れがあった。さらに、近年、環境、あるいは人体への悪影響をなくすため、特開平10−107420号に開示されているように、鉛フリー化されたはんだ材料を採用する方向にある。上述の電子部品に使用される代表的な鉛フリー化されたはんだ材料としては、例えば、錫銅系のはんだ、錫銀系のはんだがあげられるが、これらのはんだ材料は鉛を含む従来のはんだに比べてはんだぬれ性が悪く、はんだ付け性が低下するという問題点があった。
【0006】
本発明は上記問題点を解決するためになされたもので、はんだを介したリード端子と回路基板の導電パターンとの接合強度を向上させることができる電子部品のリード端子構造を提供することを目的とするものである。
【0007】
【課題を解決するための手段】
そこで、本発明の電子部品のリード端子構造は、断面が円形の線状タイプの金属リード端子が貫通固定されたベースと、前記金属リード端子に電気的に接続されてなる電子部品素子と、前記ベースに被せて前記電子部品素子を気密封止してなるキャップとを具備する電子部品があり、前記金属リード端子のアウターリード部に、幅広部と前記幅広部が形成された領域で屈曲部を形成して、回路基板との導電接続部を構成し、はんだを介して回路基板の導電パターンと接合されてなる電子部品のリード端子構造において、前記幅広部は、プレス加工により、その断面形状が底面に回路基板と対向する第1の扁平部と、側面に一対の曲率部と、上面に第2の扁平部とからなり、かつ、前記幅広部の厚みTに対して前記第1及び第2の扁平部の幅Wを1.5倍から4倍に設定してなり、前記第1の扁平部及び前記一対の曲率部には鉛フリー化されたはんだ膜が形成されてなることを特徴とする。
【0008】
【発明の効果】
本発明によれば、前記リード端子の幅広部において、前記底面の回路基板と対向する扁平部を有することで、はんだによる回路基板との面接触領域を確保するとともに、前記側面の曲率部を有することで、はんだによる回路基板からリード端子上端部にかけてメニスカスが十分に形成されやすくなる。さらに、前記曲率部の形状に沿ったはんだの這い上がり領域も十分に形成されるので、リード端子の幅広部におけるはんだによる回路基板の導電パターンとの接合強度を飛躍的に向上させることができる(図5参照)。
【0009】
そして、前記リード端子の幅広部の厚みTに対して扁平部の幅Wを1.5倍から4倍に設定しているので、リード端子の曲げ加工精度を低下させることなく、回路基板との接合強度を向上させることができ、実施するうえで好ましい。また、幅広部には鉛フリー化されたはんだ膜が形成されているので、電子部品の鉛フリー化対応ができるだけでなく、回路基板からリード端子の上部にかけて形成されるはんだの這い上がり性能が向上し、リード端子の幅広部におけるはんだによる回路基板の導電パターンとの接合強度がさらに高まる。
【0010】
また、前記幅広部の扁平部により、金属リード端子の折り曲げに必要とする折り曲げ力を小さくし、リード端子の折り曲げる際の方向性を出し、折り曲げ加工精度を向上させることができる。従って、リード端子に屈曲部を具備する表面実装型電子部品の製造性が高められる。
【0011】
また、リード端子の扁平部が上下面に形成されるので、折り曲げ加工性および折り曲げ方向性をさらに向上させる。
【0012】
【発明の実施の形態】
本発明の第1の実施例について、絶縁板を介して表面実装化した水晶振動子を例にとり図面を参照して説明する。図1(a)は本発明の第1の実施形態を示すリード端子付き水晶振動子を長辺からみた側面図、図1(b)は同じく短辺方向からみた側面図であり、図2は本発明の第1の実施形態を示す表面実装型水晶振動子の斜視図である。また、図3は本発明の第1の実施形態を示すリード端子幅広部の断面図であり、図4は本発明の第1の実施形態を示す表面実装型水晶振動子の正面図である。
【0013】
水晶振動子2は、リード端子21,22の植設されたベース20と、ベース上に搭載される水晶振動素子(図示せず)と、当該水晶振動素子を含んでベース上部を被覆するキャップ25とからなる。図示していないが水晶振動素子には励振電極が形成されており、当該励振電極は前記リード端子に電気的に接続されて外部に導出されている。
【0014】
リード端子21,22は断面が円形の線状タイプであり、ベース下部から突出した部分(アウターリード部)において、幅広部23,24が形成されている。上記リード端子は、例えば、コバール母材にニッケルメッキ、その上部に錫鉛系のはんだ、あるいは錫銅系のはんだがディップ(浸漬)などの手法によりはんだ膜が施されている(図示せず)。幅広部は、底面に回路基板と対向する第1の扁平部231,241と、側面に曲率部232,242と、上面に第2の扁平部233,243とを形成してなり、図3に示すように、その断面形状を幅寸法に対して厚み寸法が小さく形成されたトラック形状としている。これらの形状はプレス加工により構成することができる。また、このプレス加工後、前記リード端子の幅広部23,24には、再びディップすることで、さらに錫鉛系のはんだ、あるいは錫銅系のはんだからなるはんだ膜Hが形成されている。
【0015】
なお、前記リード端子の幅広部の厚み(曲率部の高さ)Tに対して扁平部の幅Wを1.5倍から4倍ぐらいに設定することで、リード端子の曲げ加工精度を低下させることなく、回路基板との接合強度を向上させることができるので実施するうえで好ましい。これは、前記リード端子の幅広部の厚みTに対して扁平部の幅Wを1.5倍より小さく設定すると、金属リード端子の折り曲げに必要とする折り曲げ力を小さくすることができず、リード端子の折り曲げる際の方向性が出しにくくなるので、リード端子の加工精度が低下する。さらに、扁平部の幅が小さくなるので、はんだを介した回路基板との面接触領域を確保することができず、接合強度も低下する。また、前記リード端子の幅広部の厚みTに対して扁平部の幅Wを4倍より大きく設定すると、曲率部の形成部分が小さくなり、この曲率によって回路基板からリード端子上端部にかけて形成されるはんだメニカスとはんだ這い上がり領域が十分に形成されず、回路基板との接合強度が極端に低下する。さらに、プレス加工で幅広部を構成する場合、リード端子の圧縮率が高まるため、リード端子に形成されたニッケルメッキに亀裂が入り、上部のはんだ膜の形成に悪影響が生じ、はんだぬれ性やはんだ這い上がり性が低下することによっても、回路基板との接合強度が極端に低下する。
【0016】
絶縁板3は平面でみて平板に切り欠き31,32が形成され、全体としてH字形状である。この切り欠きの幅はリード端子の平板部の幅より大きく設計されており、かつ切り欠きの開口部分には係止部33,34が形成されている。この係止部はリード端子の過度の折り曲げによるベースとの短絡を防止する機能を有している。
【0017】
図2は外部リード端子21,22に幅広部が形成された水晶振動子2と、この水晶振動子2の底面に取り付ける絶縁板3を示している。水晶振動子2の下部(底面)に接合材により絶縁板3を取り付ける。その後、矢印の方向にリード端子(21については折り曲げ済みのものを図示)を折り曲げて、屈曲部26,27を形成する。このとき前述の扁平部(幅広部)開始部分が支点となって折れ曲がりが開始され、最終的に図4に示すように、リード端子21,22が絶縁板の切り欠き部にほぼ収納されるとともに、当該リード端子の幅広部の先端部分が回路基板との導電接続部を構成し、表面実装型水晶振動子の完成となる。
【0018】
以上のように構成された表面実装型水晶振動子は、リード端子の導電接続部において、予めスクリーン印刷などにより回路基板の導電パターンに塗布されたクリームはんだを溶融することで、回路基板の導電パターンと接合される。
【0019】
次に、本発明の第2の実施例について、表面実装化したシリンダータイプの水晶振動子を例にとり図面を参照して説明する。図6は本発明の第2の実施例を示す表面実装型水晶振動子の斜視図であり、図7は本発明の第2の実施形態を示すリード端子幅広部の断面図である。
【0020】
水晶振動子4は、断面が円形の線状タイプのリード端子41,42の植設されたベース40と、ベース上に搭載される水晶振動素子(図示せず)と、当該水晶振動素子を含んでベース上部を被覆するシリンダータイプのキャップ45(ケース本体)とからなる。図示していないが水晶振動素子には励振電極が形成されており、当該励振電極は前記リード端子に電気的に接続されて外部に導出されている。このシリンダータイプの水晶振動子4では、キャップ(ケース本体)45を横向きに配置し、横方向から突出したリード端子部分(アウターリード部)に、屈曲部46,47,48,49を形成して回路基板側へ折り曲げ、その先端の一部のみに幅広部43,44を形成することで、表面実装化している。
【0021】
上記リード端子41,42は、例えば、コバール母材にニッケルメッキ、その上部に錫鉛系のはんだ、あるいは錫銅系のはんだがディップなどの手法によりはんだ膜が施されている(図示せず)。
【0022】
本発明の第2の実施形態でも、前記幅広部43,44は、底面に回路基板と対向する第1の扁平部431,441(図示せず)と、側面に曲率部432,442と、上面に第2の扁平部433,443とを形成してなり、その断面形状を幅寸法に対して厚み寸法が小さく形成されたトラック形状としている。これらの形状はプレス加工により構成することができる。また、このプレス加工後、前記リード端子の幅広部43,44には、再びディップすることで、さらに錫鉛系のはんだ、あるいは錫銅系のはんだからなるはんだ膜Hが形成されている。
【0023】
以上のように構成された表面実装型水晶振動子は、リード端子の幅広部において、予めスクリーン印刷などにより回路基板の導電パターンに塗布されたクリームはんだを溶融することで、回路基板の導電パターンと接合される。
【0024】
本発明は、電子部品として水晶振動子を例示したが、各種リード端子付き電子部品にも適用できる。また、前記扁平部はリード端子部を一部切り欠くことにより形成してもよい。さらに、はんだ膜として、錫鉛系のはんだや錫銅系のはんだに限ることなく、錫メッキや鉛フリーはんだメッキなどの低融点金属であってもよい。
【図面の簡単な説明】
【図1】 第1の実施形態を示す側面図。
【図2】 第1の実施形態を示す斜視図。
【図3】 第1の実施形態を示すリード端子幅広部の断面図。
【図4】 第1の実施形態を示す正面図。
【図5】 本発明のリード端子幅広部におけるはんだの塗布状態を示す図。
【図6】 第2の実施例を示す斜視図。
【図7】 第2の実施形態を示すリード端子幅広部の断面図。
【符号の説明】
2、4 水晶振動子
3 絶縁板
20、40 ベース
21、22、41、42 リード端子
25、45 キャップ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terminal structure of a lead terminal, for example, a metal lead terminal structure of an electronic component.
[0002]
[Prior art]
Conventionally, Japanese Patent Application Laid-Open No. 2000-216517 discloses an electronic component in which a lead terminal of a two-terminal electronic component is bent and surface-mounted via an insulating plate. This will be described as an example.
[0003]
The electronic component includes an electronic component main body in which the electronic component element is accommodated, and a metal lead terminal that electrically leads the electronic component element to the outside. The lead terminal has a configuration in which the cross section is only circular, or a configuration in which the cross section is circular and is formed into a flat plate portion by pressing from a portion slightly below the lead-out portion of the electronic component main body to form a flat plate portion There is. In the case of pressing, it is performed in the bending direction described later, and one lead terminal is pressed from both sides by two movable dies, and a thin portion is formed on the lead terminal, thereby forming a flat plate shape. Then, an insulating plate is attached to the lead terminal of the electronic component, and the lead terminal is bent through the insulating plate to be surface-mounted.
[0004]
[Problems to be solved by the invention]
Among the lead terminal configurations as described above, in the case of a lead terminal consisting only of a circle, when the conductive pattern of the circuit board is joined with solder, the surface of the circuit board through the solder is compared with the flat lead terminal. There was a possibility that the contact area was small and the bonding strength was lowered. Furthermore, there is a drawback in that a large force is required when bending the metal lead terminal, and there is a disadvantage that the directionality during the bending is difficult to be obtained, and improvement of accuracy when bending the lead terminal is desired for surface mounting. It was.
[0005]
In addition, in a lead terminal processed into a flat plate shape, the conductive pattern of the circuit board and the solder are joined at the flat plate portion (wide part) of the lead terminal, but the solder creeping formed from the circuit board to the lead terminal is sufficient. It was not formed, and there was a possibility that the bonding strength was lowered. Furthermore, in recent years, in order to eliminate adverse effects on the environment or the human body, as disclosed in Japanese Patent Laid-Open No. 10-107420, there is a tendency to use a solder material made lead-free. Typical lead-free solder materials used for the above-mentioned electronic components include, for example, tin copper solder and tin silver solder. These solder materials are conventional solders containing lead. Compared to the above, the solder wettability is poor and the solderability is lowered.
[0006]
The present invention has been made to solve the above-described problems, and an object thereof is to provide a lead terminal structure for an electronic component capable of improving the bonding strength between a lead terminal via a solder and a conductive pattern of a circuit board. It is what.
[0007]
[Means for Solving the Problems]
Therefore, the lead terminal structure of the electronic component according to the present invention includes a base in which a linear type metal lead terminal having a circular cross section is fixed, and an electronic component element electrically connected to the metal lead terminal. There is an electronic component that includes a cap that covers the base and hermetically seals the electronic component element, and the outer lead portion of the metal lead terminal has a wide portion and a bent portion in a region where the wide portion is formed. In the lead terminal structure of an electronic component formed to form a conductive connection portion with the circuit board and bonded to the conductive pattern of the circuit board via solder, the wide portion has a cross-sectional shape by pressing. The first flat portion includes a first flat portion opposed to the circuit board on the bottom surface, a pair of curvature portions on the side surface, and a second flat portion on the top surface, and the thickness T of the wide portion . Width W of flat part It is set to 4 times 1.5 times, the the first flat portion and the pair of curved portion, characterized by comprising a solder layer which is lead-free is formed.
[0008]
【The invention's effect】
According to the present invention, the wide portion of the lead terminal has a flat portion facing the circuit board on the bottom surface, thereby ensuring a surface contact area with the circuit board by solder and having a curved portion on the side surface. Thus, a meniscus is easily formed from the circuit board made of solder to the upper end portion of the lead terminal. Furthermore, since the solder rising area along the shape of the curvature portion is sufficiently formed, the bonding strength of the wide portion of the lead terminal with the conductive pattern of the circuit board by the solder can be dramatically improved ( (See FIG. 5).
[0009]
And since the width W of the flat portion is set to 1.5 to 4 times the thickness T of the wide portion of the lead terminal, the bending accuracy of the lead terminal can be reduced without reducing the accuracy of bending the lead terminal. Bonding strength can be improved, which is preferable for implementation. In addition, since the lead-free solder film is formed on the wide part, not only can electronic parts be made lead-free, but also the creeping performance of the solder formed from the circuit board to the top of the lead terminal is improved. In addition, the bonding strength of the wide portion of the lead terminal with the conductive pattern of the circuit board by solder is further increased.
[0010]
In addition, the flat portion of the wide portion can reduce the bending force required for bending the metal lead terminal, provide directionality when the lead terminal is bent, and improve the bending accuracy. Therefore, the manufacturability of the surface mount electronic component having the bent portion on the lead terminal is improved.
[0011]
Moreover, since the flat part of a lead terminal is formed in an up-and-down surface, bending workability and bending directionality are further improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to the drawings, taking as an example a crystal resonator surface-mounted through an insulating plate. FIG. 1 (a) is a side view of the crystal unit with lead terminals showing the first embodiment of the present invention as seen from the long side, FIG. 1 (b) is a side view of the same from the short side direction, and FIG. 1 is a perspective view of a surface-mounted crystal resonator showing a first embodiment of the present invention. FIG. 3 is a cross-sectional view of the lead terminal wide portion showing the first embodiment of the present invention, and FIG. 4 is a front view of the surface-mounted crystal resonator showing the first embodiment of the present invention.
[0013]
The crystal resonator 2 includes a base 20 in which lead terminals 21 and 22 are implanted, a crystal resonator element (not shown) mounted on the base, and a cap 25 that includes the crystal resonator element and covers the upper portion of the base. It consists of. Although not shown, an excitation electrode is formed on the crystal resonator element, and the excitation electrode is electrically connected to the lead terminal and led out to the outside.
[0014]
The lead terminals 21 and 22 are linear types having a circular cross section, and wide portions 23 and 24 are formed at portions protruding from the lower portion of the base (outer lead portions). The lead terminal has, for example, a nickel film on a Kovar base material and a tin lead-based solder or a tin-copper solder on the upper portion thereof by a dipping (immersion) technique (not shown). . The wide portion is formed by forming first flat portions 231 and 241 facing the circuit board on the bottom surface, curvature portions 232 and 242 on the side surfaces, and second flat portions 233 and 243 on the top surface, as shown in FIG. As shown, the cross-sectional shape is a track shape in which the thickness dimension is smaller than the width dimension. These shapes can be configured by pressing. Further, after the press working, the wide portions 23 and 24 of the lead terminals are dipped again, so that a solder film H made of tin-lead solder or tin-copper solder is further formed.
[0015]
In addition, by setting the width W of the flat part to about 1.5 to 4 times the thickness (height of the curvature part) T of the wide part of the lead terminal, the bending accuracy of the lead terminal is lowered. Therefore, the bonding strength with the circuit board can be improved, which is preferable for implementation. This is because if the width W of the flat portion is set to be smaller than 1.5 times the thickness T of the wide portion of the lead terminal, the bending force required for bending the metal lead terminal cannot be reduced. Since it is difficult to obtain directionality when the terminal is bent, the processing accuracy of the lead terminal is lowered. Furthermore, since the width of the flat portion is reduced, it is not possible to ensure a surface contact area with the circuit board via solder, and the bonding strength is also reduced. Further, if the width W of the flat portion is set to be larger than 4 times the thickness T of the wide portion of the lead terminal, a portion where the curvature portion is formed becomes small, and this curvature is formed from the circuit board to the upper end portion of the lead terminal. The solder meniscus and the solder rising area are not sufficiently formed, and the bonding strength with the circuit board is extremely reduced. Furthermore, when the wide part is formed by press working, the compression ratio of the lead terminal increases, so the nickel plating formed on the lead terminal cracks, adversely affects the formation of the upper solder film, solder wettability and solder Even if the creeping property is lowered, the bonding strength with the circuit board is extremely lowered.
[0016]
The insulating plate 3 has a notch 31 and 32 formed in a flat plate as viewed in a plane, and has an H shape as a whole. The width of the notch is designed to be larger than the width of the flat portion of the lead terminal, and locking portions 33 and 34 are formed at the opening of the notch. This locking portion has a function of preventing a short circuit with the base due to excessive bending of the lead terminal.
[0017]
FIG. 2 shows a crystal resonator 2 having a wide portion formed on the external lead terminals 21 and 22 and an insulating plate 3 attached to the bottom surface of the crystal resonator 2. The insulating plate 3 is attached to the lower part (bottom surface) of the crystal unit 2 with a bonding material. Thereafter, the lead terminals (the bent one is shown in the figure) are bent in the direction of the arrow to form the bent portions 26 and 27. At this time, bending starts with the above-described flat portion (wide portion) starting portion as a fulcrum, and finally, as shown in FIG. 4, the lead terminals 21 and 22 are almost housed in the notches of the insulating plate. The leading end portion of the wide portion of the lead terminal constitutes a conductive connection portion with the circuit board, and the surface mount type crystal resonator is completed.
[0018]
The surface-mount type crystal resonator configured as described above has the conductive pattern of the circuit board by melting the cream solder previously applied to the conductive pattern of the circuit board by screen printing or the like at the conductive connection portion of the lead terminal. Joined with.
[0019]
Next, a second embodiment of the present invention will be described with reference to the drawings, taking as an example a surface mounted cylinder type crystal resonator. FIG. 6 is a perspective view of a surface-mount type crystal resonator according to a second embodiment of the present invention, and FIG. 7 is a cross-sectional view of a wide lead terminal portion according to the second embodiment of the present invention.
[0020]
The crystal unit 4 includes a base 40 in which linear type lead terminals 41 and 42 having a circular cross section, a crystal resonator element (not shown) mounted on the base, and the crystal resonator element. And a cylinder-type cap 45 (case body) covering the upper part of the base. Although not shown, an excitation electrode is formed on the crystal resonator element, and the excitation electrode is electrically connected to the lead terminal and led out to the outside. In this cylinder-type crystal unit 4, a cap (case body) 45 is disposed horizontally, and bent portions 46, 47, 48, 49 are formed on lead terminal portions (outer lead portions) protruding from the lateral direction. Surface mounting is achieved by bending toward the circuit board and forming wide portions 43 and 44 only at a portion of the tip.
[0021]
The lead terminals 41 and 42 are, for example, nickel-plated on a Kovar base material, and tin lead-based solder or tin-copper solder on the upper portion thereof by a dipping method (not shown). .
[0022]
Also in the second embodiment of the present invention, the wide portions 43 and 44 include first flat portions 431 and 441 (not shown) opposed to the circuit board on the bottom surface, curved portions 432 and 442 on the side surfaces, and an upper surface. The second flat portions 433 and 443 are formed in the track shape, and the cross-sectional shape thereof is a track shape in which the thickness dimension is smaller than the width dimension. These shapes can be formed by press working. In addition, after the press working, the wide portions 43 and 44 of the lead terminals are dipped again, so that a solder film H made of tin lead solder or tin copper solder is further formed.
[0023]
The surface-mount type crystal resonator configured as described above is obtained by melting the cream solder previously applied to the conductive pattern of the circuit board by screen printing or the like in the wide portion of the lead terminal. Be joined.
[0024]
The present invention exemplifies a crystal resonator as an electronic component, but can also be applied to electronic components with various lead terminals. Further, the flat portion may be formed by cutting out a part of the lead terminal portion. Furthermore, the solder film is not limited to tin-lead solder or tin-copper solder, but may be a low melting point metal such as tin plating or lead-free solder plating.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment.
FIG. 2 is a perspective view showing the first embodiment.
FIG. 3 is a cross-sectional view of a wide lead terminal portion showing the first embodiment.
FIG. 4 is a front view showing the first embodiment.
FIG. 5 is a view showing a solder application state in the wide lead terminal portion of the present invention.
FIG. 6 is a perspective view showing a second embodiment.
FIG. 7 is a cross-sectional view of a lead terminal wide portion showing a second embodiment.
[Explanation of symbols]
2, 4 Crystal resonator 3 Insulating plate 20, 40 Base 21, 22, 41, 42 Lead terminal 25, 45 Cap

Claims (1)

断面が円形の線状タイプの金属リード端子が貫通固定されたベースと、前記金属リード端子に電気的に接続されてなる電子部品素子と、前記ベースに被せて前記電子部品素子を気密封止してなるキャップとを具備する電子部品があり、前記金属リード端子のアウターリード部に、幅広部と前記幅広部が形成された領域で屈曲部を形成して、回路基板との導電接続部を構成し、はんだを介して回路基板の導電パターンと接合されてなる電子部品のリード端子構造において、前記幅広部は、プレス加工により、その断面形状が底面に回路基板と対向する第1の扁平部と、側面に一対の曲率部と、上面に第2の扁平部とからなり、かつ、前記幅広部の厚みTに対して前記第1及び第2の扁平部の幅Wを1.5倍から4倍に設定してなり、前記第1の扁平部及び前記一対の曲率部には鉛フリー化されたはんだ膜が形成されてなることを特徴とする電子部品のリード端子構造。A linear type metal lead terminal having a circular cross section is fixedly penetrated; an electronic component element electrically connected to the metal lead terminal; and the electronic component element is hermetically sealed over the base. An electronic component having a cap, and a bent portion is formed in the outer lead portion of the metal lead terminal in a region where the wide portion and the wide portion are formed to form a conductive connection portion with the circuit board. In the lead terminal structure of the electronic component joined to the conductive pattern of the circuit board via the solder, the wide part is formed by pressing so that the cross-sectional shape of the first flat part is opposed to the circuit board on the bottom surface. And a pair of curvature portions on the side surface and a second flat portion on the upper surface, and the width W of the first and second flat portions is 1.5 to 4 times the thickness T of the wide portion. Set to double the first Lead terminal structure of an electronic component in the flat portion and the pair of curved portion, characterized by comprising a solder layer which is lead-free is formed.
JP2002274074A 2002-09-19 2002-09-19 Electronic component lead terminal structure Expired - Fee Related JP3777608B2 (en)

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