JP3575973B2

JP3575973B2 - Variable resistor

Info

Publication number: JP3575973B2
Application number: JP03280598A
Authority: JP
Inventors: 俊生本間
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 1998-02-16
Filing date: 1998-02-16
Publication date: 2004-10-13
Anticipated expiration: 2018-02-16
Also published as: JPH11233317A

Description

【０００１】
【発明の属する技術分野】
本発明は、電子機器などに使用される半固定型の抵抗器に適用して好適な可変抵抗器に関する。
【０００２】
【従来の技術】
従来の可変抵抗器を図８、図９に基づいて説明すると、孔３１ａを有するセラミック等の絶縁基板３１の一面上には、円弧状に抵抗体３２が設けられ、その両端部には、銀ペースト等からなる端子部３３が形成されている。
また、１枚の金属板からなる回転部材３４は、打ち抜き、折り曲げされて第１板状部３５と第２板状部３６とを有し、第１板状部３５は、中心部に孔３５ａを有し、絞り加工で形成された凸部３５ｂと、外周部に設けられた摺動子３５ｃとを有し、また、第２板状部３６は、中心部にマイナス状のドライバー溝３６ａを有している。
そして、第１と第２板状部３５、３６は、ストッパー部３７を兼ねる連結部３８で繋がれ、この連結部３８を二つに折り曲げて、第１と第２板状部３５、３６が対向して重ね合わされた状態となっている。
【０００３】
また、金属板からなる取付板３９は、中心部に絞り加工により形成された軸３９ａと、折り曲げによって形成されたストッパー部３９ｂとを有し、この取付板３９は、絶縁基板３１の他面側に配置されて、軸３９ａが絶縁基板３１の孔３１ａに挿通され、ストッパー部３９ｂが絶縁基板３１の側部から上方に突出した状態で配置されている。
そして、第１板状部３５の孔３５ａに軸３９ａを挿通し、軸３９ａの先端をかしめて、軸３９ａに回転部材３４を回転可能に取り付けている。
そして、回転部材３４が取り付けられた時、摺動子３５ｃは抵抗体３２上に接触し、ドライバー（図示せず）をドライバー溝３６ａに挿入して、回転部材３４を回転すると、摺動子３５ｃは抵抗体３２上を摺動して抵抗値を可変すると共に、ストッパー部３８がストッパー部３９ｂにぶつかって、回転部材３４の回転が停止するようになっている。
また、回転部材３４の回転範囲は、約２５０度程度で、この回転の範囲で抵抗値の可変が行われるものである。
そして、このような可変抵抗器は、プリント基板（図示せず）に半田付けして使用されるが、この可変抵抗器をプリント基板に半田付け、或いは可変抵抗器の半田付けが完了したプリント基板に他部品を半田付けする時、噴霧状の半田フラックスが飛散し、抵抗体３２上、及び摺動子３５ｃに付着する。
【０００４】
【発明が解決しようとする課題】
即ち、従来の可変抵抗器は、回転部材３４の第１板状部３５と第２板状部３６が、単に二つ折りにされて重ね合わされたものであるため、抵抗体３２と摺動子３５ｃの上部は第２板状部で覆われてはいるものの、外周部はむき出しの状態となり、半田フラックスが抵抗体３２上、及び摺動子３５ｃに付着すという問題がある。
そして、半田フラックスが抵抗体３２上、及び摺動子３５ｃに付着すと、摺動子３５ｃの抵抗体３２への接触が不安定となり、正確な抵抗調整が出来ないと言う問題がある。
【０００５】
【課題を解決するための手段】
上記課題を解決するための第１の解決手段として、一面上に抵抗体を設けた絶縁基板と、摺動子を設けた第１板状部と折り曲げ壁を設けた第２板状部を有する１枚の金属板からなる回転部材とを備え、前記回転部材は前記第１と第２板状部を連結する連結部を折り曲げて、第１板状部と第２板状部とを対向状態に配置して、前記絶縁基板に回転可能に取り付けられ、前記摺動子が前記抵抗体上を摺接すると共に、前記折り曲げ壁で前記抵抗体の外周部を覆うようにした構成とした。
また、第２の解決手段として、前記折り曲げ壁で、前記摺動子の外周部を覆うようにした構成とした。
また、第３の解決手段として、前記折り曲げ壁で、前記摺動子の前記抵抗体への接触部を含む前記摺動子の外周部を覆うようにした構成とした。
また、第４の解決手段として、前記折り曲げ壁を、円弧状で、絞り加工により形成した構成とした。
また、第５の解決手段として、前記折り曲げ壁は、円弧状の前記抵抗体の全可変範囲におけるセンター部を中心として前記全可変範囲の４０％以上の範囲で形成した構成とした。
【０００６】
【発明の実施の形態】
本発明の可変抵抗器を図１〜図７に基づいて説明すると、図１は本発明の可変抵抗器の平面図、図２は本発明の可変抵抗器の断面図、図３は本発明の可変抵抗器に係る絶縁基板の平面図、図４は本発明の可変抵抗器に係る回転部材の展開図、図５は図４における断面図、図６は本発明の可変抵抗器に係る回転部材の平面図、図７は図６における断面図である。
【０００７】
本発明における可変抵抗器である半固定型の可変抵抗器は、図１〜図７に示すように、セラミック等の絶縁基板１は、その中心部に設けられた孔１ａと、窪み部１ｂと、窪み部１ｂ内に設けられたストッパー部１ｃとを有している。
また、絶縁基板１の一面上には、円弧状に抵抗体２が設けられ、その両端部には、銀ペースト等で形成された端子部３が形成されている。
また、１枚の金属板からなる回転部材４は、特に図４〜図７に示すように、打ち抜き、折り曲げされて第１板状部５と第２板状部６とを有し、第１板状部５は、中心部に孔５ａを有し、絞り加工で形成された凸部５ｂと、凸部５ｂに設けられたストッパー部５ｃと、外周部に設けられた摺動子５ｄと、一対の係合部５ｅとを有している。
また、第２板状部６は、中心部に設けられた十字状のドライバー溝６ａと、一対の折り曲げ部６ｂと、外周部に約１１０度の範囲にわたって絞り加工により形成された円弧状の折り曲げ壁６ｃとを有している。
【０００８】
そして、第１と第２板状部５、６は、図４、図７に示すように、連結部７で繋がれると共に、一対の前記係合部５ｅと一対の前記折り曲げ部６ｂのそれぞれは、第１と第２板状部５、６の中心部を通る線Ｓ１の両側に位置して形成されている。
そして、このような回転部材４は、図６、図７に示すように、この連結部７を二つに折り曲げて、第１と第２板状部５、６が対向して重ね合わされた状態となっている。
この時、第２板状部６に設けられた一対の折り曲げ部６ｂの側面は、第１板状部５の係合部５ｅに係合した状態となると共に、第２板状部６の折り曲げ壁６ｃは、摺動子５ｄの外周部を囲んで覆うようになっている。
そして、このような回転部材４は、凸部５ｂを絶縁基板１の窪み部１ｂ内に位置させて、絶縁基板１に取り付けられるようになっており、取り付けられた際は、回転部材４のストッパー部５ｃが絶縁基板１のストッパー部１ｃと係脱可能になると共に、折り曲げ壁６ｃが抵抗体２の外周部を、約１１０度の範囲で囲んで覆うようになる。
【０００９】
また、金属板からなる取付板８は、中心部に絞り加工により形成された軸８ａと、位置決め用の折り曲げ片８ｂとを有し、この取付板８は、絶縁基板１の他面側に配置されて、軸８ａが絶縁基板１の孔１ａに挿通され、折り曲げ片８ｂが絶縁基板１の側部に位置した状態で配置されている。
そして、第１板状部５の孔５ａに軸８ａを挿通し、軸８ａの先端をかしめて、軸８ａに回転部材４を回転可能に取り付けている。
そして、回転部材４が取り付けられた時、摺動子５ｄは抵抗体２上に接触し、ドライバー（図示せず）をドライバー溝６ａに挿入して、回転部材４を回転すると、摺動子５ｄは抵抗体２上を摺動して抵抗値を可変すると共に、ストッパー部５ｃがストッパー部１ｃにぶつかって、回転部材４の回転が停止するようになっている。
そして、この第２板状部６の回転は、連結部７を介すると共に、折り曲げ部６ｂが係合部５ｅに係合し、この係合状態をも介して第１板状部５を回転するようになっている。
また、回転部材４の回転範囲、即ち、全可変範囲は、約２５０度程度で、この回転の範囲で抵抗値の可変が行われるものである。
【００１０】
また、本発明のような半固定型の可変抵抗器は、通常、回転部材４の全可変範囲である約２５０度のセンター部Ｃを中心として、左右に若干回転した範囲で使用される頻度が非常に高い。
そして、折り曲げ壁６ｃの形成範囲は約１１０度で、この範囲は、抵抗体２の全可変範囲である約２５０度の約４０％に相当するものとなっており、しかも、この約４０％の形成範囲は、センター部Ｃを中心とした範囲で形成されている。
なお、センター部Ｃを中心とする理由は、プリント基板への実装の際に、摺動子５ｄの抵抗体２に接する個所をセンター部Ｃに置いて、後述のように半田付けするためであり、これは自動調整作業を効率よく行えるようにするためである。
【００１１】
そして、このような可変抵抗器は、プリント基板（図示せず）に半田付けして使用されるが、この可変抵抗器をプリント基板に半田付け、或いは可変抵抗器の半田付けが完了したプリント基板に他部品を半田付けする時、噴霧状の半田フラックスが飛散するが、抵抗体２、及び摺動子５ｄの外周部を覆う折り曲げ壁６ｃにより、抵抗体２上、及び摺動子５ｄへの半田フラックスの付着が極めて少なくなる。
また、実験によれば、抵抗体２の全可変範囲のセンター部Ｃの付近において、摺動子５ｄを回転して抵抗調整を行った結果、折り曲げ壁６ｃは、センター部Ｃを中心として全可変範囲の４０％以上にすると、抵抗値の可変の確実なものが得られた。
【００１２】
【発明の効果】
本発明の可変抵抗器において、回転部材４の第２板状部６に設けた折り曲げ壁６ｃで、抵抗体２の外周一部を覆うようにしたため、半田フラックスの抵抗体２への付着が少なくなり、摺動子５ｄの抵抗体２への接触が確実な可変抵抗器を提供できる。
また、折り曲げ壁６ｃで、摺動子５ｄの外周部を覆うようにしたため、半田フラックスの摺動子５ｄへの付着を一層少なくでき、抵抗調整の確実な可変抵抗器を提供できる。
【００１３】
また、折り曲げ壁６ｃにより、摺動子５ｄの抵抗体２への接触部を含んで摺動子５ｄの外周部を覆うようにしたため、一層、摺動子５ｄと抵抗体２への半田フラックスの付着が少なくなり、摺動子５ｄの抵抗体２への接触が確実な可変抵抗器を提供できる。
また、折り曲げ壁６ｃを、円弧状の絞り加工により形成することによって、その構成が簡単で、生産性が良く、小型で安価な可変抵抗器を提供できる。
また、折り曲げ壁６ｃは、センター部Ｃを中心として全可変範囲の４０％以上の範囲で形成すると、特に、半固定型に使用して好適な可変抵抗器を提供できる。
【図面の簡単な説明】
【図１】本発明の可変抵抗器の平面図。
【図２】本発明の可変抵抗器の断面図。
【図３】本発明の可変抵抗器に係る絶縁基板の平面図。
【図４】本発明の可変抵抗器に係る回転部材の展開図。
【図５】図４における断面図。
【図６】本発明の可変抵抗器に係る回転部材の平面図。
【図７】図６における断面図。
【図８】従来の可変抵抗器の平面図。
【図９】従来の可変抵抗器の断面図。
【符号の説明】
１絶縁基板
１ａ孔
１ｂ窪み部
１ｃストッパー部
２抵抗体
３端子
４回転部材
５第１板状部
５ａ孔
５ｂ凸部
５ｃストッパー部
５ｄ摺動子
５ｅ係合部
６第２板状部
６ａドライバー溝
６ｂ折り曲げ部
６ｃ折り曲げ壁
７連結部
８取付板
８ａ軸
８ｂ折り曲げ片[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a variable resistor suitable for being applied to a semi-fixed resistor used in electronic equipment and the like.
[0002]
[Prior art]
A conventional variable resistor will be described with reference to FIGS. 8 and 9. On one surface of an insulating substrate 31 made of ceramic or the like having a hole 31a, a resistor 32 is provided in an arc shape. A terminal 33 made of paste or the like is formed.
The rotating member 34 made of one metal plate is punched and bent to have a first plate-shaped portion 35 and a second plate-shaped portion 36. The first plate-shaped portion 35 has a hole 35a in the center. And a convex portion 35b formed by drawing and a slider 35c provided on the outer peripheral portion. The second plate portion 36 has a minus driver groove 36a at the center. Have.
The first and second plate-shaped portions 35 and 36 are connected by a connecting portion 38 also serving as a stopper portion 37, and the connecting portion 38 is bent into two to form the first and second plate-shaped portions 35 and 36. It is in a state of being superposed opposing.
[0003]
The mounting plate 39 made of a metal plate has a shaft 39a formed by drawing at the center and a stopper portion 39b formed by bending. The mounting plate 39 is provided on the other side of the insulating substrate 31. , The shaft 39a is inserted into the hole 31a of the insulating substrate 31, and the stopper 39b is disposed so as to protrude upward from the side of the insulating substrate 31.
Then, the shaft 39a is inserted into the hole 35a of the first plate-shaped portion 35, the tip of the shaft 39a is caulked, and the rotating member 34 is rotatably attached to the shaft 39a.
When the rotating member 34 is attached, the slider 35c comes into contact with the resistor 32, and a driver (not shown) is inserted into the driver groove 36a to rotate the rotating member 34. The slider slides on the resistor 32 to vary the resistance value, and the stopper 38 hits the stopper 39b to stop the rotation of the rotating member 34.
The rotation range of the rotation member 34 is about 250 degrees, and the resistance value can be changed within this rotation range.
Such a variable resistor is used by being soldered to a printed circuit board (not shown). The variable resistor is soldered to the printed circuit board, or the printed circuit board on which the variable resistor is completely soldered is used. When other components are soldered, the solder flux in the form of spray is scattered and adheres to the resistor 32 and the slider 35c.
[0004]
[Problems to be solved by the invention]
That is, in the conventional variable resistor, the first plate-shaped portion 35 and the second plate-shaped portion 36 of the rotating member 34 are simply folded and overlapped, so that the resistor 32 and the slider 35 c Although the upper part is covered with the second plate-shaped part, the outer peripheral part is exposed, and there is a problem that the solder flux adheres to the resistor 32 and the slider 35c.
If the solder flux adheres to the resistor 32 and the slider 35c, there is a problem that the contact of the slider 35c with the resistor 32 becomes unstable, and accurate resistance adjustment cannot be performed.
[0005]
[Means for Solving the Problems]
As a first means for solving the above problems, there is provided an insulating substrate provided with a resistor on one surface, a first plate-shaped portion provided with a slider, and a second plate-shaped portion provided with a bent wall. A rotating member formed of a single metal plate, wherein the rotating member bends a connecting portion that connects the first and second plate-shaped portions, so that the first plate-shaped portion and the second plate-shaped portion face each other. , And is rotatably attached to the insulating substrate so that the slider slides on the resistor and covers the outer periphery of the resistor with the bent wall.
Further, as a second solution, the outer peripheral portion of the slider is covered with the bent wall.
Further, as a third solution, the bent wall covers an outer peripheral portion of the slider including a contact portion of the slider with the resistor.
As a fourth solution, the bent wall is formed in an arc shape by drawing.
Further, as a fifth solution means, the bent wall is formed so as to be formed in a range of 40% or more of the entire variable range around the center portion in the entire variable range of the arc-shaped resistor.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The variable resistor of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a plan view of the variable resistor of the present invention, FIG. 2 is a cross-sectional view of the variable resistor of the present invention, and FIG. FIG. 4 is a plan view of an insulating substrate according to the variable resistor, FIG. 4 is a developed view of a rotating member according to the variable resistor of the present invention, FIG. 5 is a cross-sectional view in FIG. 4, and FIG. FIG. 7 is a sectional view of FIG.
[0007]
As shown in FIGS. 1 to 7, a semi-fixed type variable resistor, which is a variable resistor according to the present invention, has an insulating substrate 1 made of ceramic or the like having a hole 1a provided at a central portion thereof, and a hollow portion 1b. And a stopper 1c provided in the recess 1b.
On one surface of the insulating substrate 1, a resistor 2 is provided in an arc shape, and terminal portions 3 made of silver paste or the like are formed on both ends thereof.
In addition, the rotating member 4 made of one metal plate has a first plate-like portion 5 and a second plate-like portion 6 which are stamped and bent as shown in FIGS. The plate-like portion 5 has a hole 5a in the center, a convex portion 5b formed by drawing, a stopper portion 5c provided in the convex portion 5b, and a slider 5d provided in the outer peripheral portion. It has a pair of engaging portions 5e.
The second plate-shaped portion 6 has a cross-shaped driver groove 6a provided at the center portion, a pair of bent portions 6b, and an arc-shaped bent portion formed by drawing on the outer peripheral portion over a range of about 110 degrees. And a wall 6c.
[0008]
As shown in FIGS. 4 and 7, the first and second plate-like portions 5, 6 are connected by a connecting portion 7, and each of the pair of engaging portions 5e and the pair of bending portions 6b is , Are formed on both sides of a line S1 passing through the center of the first and second plate-shaped portions 5, 6.
Then, as shown in FIGS. 6 and 7, the rotating member 4 is configured such that the connecting portion 7 is bent into two, and the first and second plate-shaped portions 5 and 6 are overlapped facing each other. It has become.
At this time, the side surfaces of the pair of bent portions 6b provided on the second plate portion 6 are engaged with the engaging portions 5e of the first plate portion 5, and the bent portions of the second plate portion 6 are bent. The wall 6c surrounds and covers the outer peripheral portion of the slider 5d.
The rotating member 4 is mounted on the insulating substrate 1 with the protrusion 5b located in the recess 1b of the insulating substrate 1. When the rotating member 4 is mounted, the stopper of the rotating member 4 is stopped. The portion 5c becomes detachable from the stopper portion 1c of the insulating substrate 1, and the bent wall 6c surrounds and covers the outer peripheral portion of the resistor 2 in a range of about 110 degrees.
[0009]
The mounting plate 8 made of a metal plate has a shaft 8a formed by drawing at the center and bent pieces 8b for positioning. The mounting plate 8 is arranged on the other surface side of the insulating substrate 1. Then, the shaft 8 a is inserted into the hole 1 a of the insulating substrate 1, and the bent piece 8 b is arranged in a state of being located on the side of the insulating substrate 1.
Then, the shaft 8a is inserted into the hole 5a of the first plate-shaped portion 5, the tip of the shaft 8a is swaged, and the rotating member 4 is rotatably attached to the shaft 8a.
When the rotating member 4 is attached, the slider 5d comes into contact with the resistor 2 and a driver (not shown) is inserted into the driver groove 6a, and when the rotating member 4 is rotated, the slider 5d The slider 5 slides on the resistor 2 to change the resistance value, and the stopper 5c hits the stopper 1c to stop the rotation of the rotating member 4.
The rotation of the second plate-shaped portion 6 is performed via the connecting portion 7 and the bent portion 6b is engaged with the engaging portion 5e, and the first plate-shaped portion 5 is also rotated via this engaged state. It has become.
Further, the rotation range of the rotating member 4, that is, the entire variable range is about 250 degrees, and the resistance value is varied within this rotation range.
[0010]
Further, the semi-fixed type variable resistor as in the present invention is usually used in a range in which it is slightly rotated left and right around a center portion C of about 250 degrees which is the entire variable range of the rotating member 4. Very high.
The formation range of the bent wall 6c is about 110 degrees, which corresponds to about 40% of the total variable range of about 250 degrees of the resistor 2, and about 40% of this range. The formation range is formed around the center portion C.
The reason why the center portion C is centered is that, when mounting on a printed circuit board, a place where the slider 5d is in contact with the resistor 2 is placed in the center portion C and soldered as described later. This is to make the automatic adjustment work efficient.
[0011]
Such a variable resistor is used by being soldered to a printed circuit board (not shown). The variable resistor is soldered to the printed circuit board, or the printed circuit board on which the variable resistor is completely soldered is used. When soldering other components, the soldering flux in the form of a spray is scattered. However, the resistor 2 and the bent wall 6c covering the outer periphery of the slider 5d allow the solder flux to be spread on the resistor 2 and the slider 5d. Adhesion of solder flux is extremely reduced.
According to the experiment, the resistance was adjusted by rotating the slider 5d in the vicinity of the center portion C in the entire variable range of the resistor 2, and as a result, the bent wall 6c was fully variable around the center portion C. When it was set to 40% or more of the range, a variable resistor having a reliable value was obtained.
[0012]
【The invention's effect】
In the variable resistor of the present invention, since the bent wall 6c provided on the second plate-shaped portion 6 of the rotating member 4 covers a part of the outer periphery of the resistor 2, the adhesion of the solder flux to the resistor 2 is small. Thus, it is possible to provide a variable resistor in which the contact of the slider 5d with the resistor 2 is reliable.
Further, since the outer peripheral portion of the slider 5d is covered by the bent wall 6c, the adhesion of the solder flux to the slider 5d can be further reduced, and a variable resistor with a reliable resistance adjustment can be provided.
[0013]
Also, since the outer peripheral portion of the slider 5d is covered by the bent wall 6c including the contact portion of the slider 5d with the resistor 2, the solder flux to the slider 5d and the resistor 2 is further increased. It is possible to provide a variable resistor in which the amount of adhesion is reduced and the slider 5d contacts the resistor 2 reliably.
Further, by forming the bent wall 6c by arc drawing, it is possible to provide a small and inexpensive variable resistor with a simple configuration, good productivity, and low cost.
When the bent wall 6c is formed in a range of 40% or more of the entire variable range around the center portion C, a variable resistor particularly suitable for a semi-fixed type can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a variable resistor according to the present invention.
FIG. 2 is a sectional view of a variable resistor according to the present invention.
FIG. 3 is a plan view of an insulating substrate according to the variable resistor of the present invention.
FIG. 4 is a development view of a rotating member according to the variable resistor of the present invention.
FIG. 5 is a sectional view in FIG. 4;
FIG. 6 is a plan view of a rotating member according to the variable resistor of the present invention.
FIG. 7 is a sectional view in FIG. 6;
FIG. 8 is a plan view of a conventional variable resistor.
FIG. 9 is a cross-sectional view of a conventional variable resistor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulating board 1a Hole 1b Depression 1c Stopper 2 Resistor 3 Terminal 4 Rotating member 5 First plate 5a Hole 5b Convex 5c Stopper 5d Slider 5e Engagement 6 Second plate 6a Driver groove 6b Bending portion 6c Bending wall 7 Connecting portion 8 Mounting plate 8a Shaft 8b Bending piece

Claims

An insulating substrate provided with a resistor on one surface, a rotating member made of one metal plate having a first plate-shaped portion provided with a slider and a second plate-shaped portion provided with a bent wall, The rotating member bends a connecting portion that connects the first and second plate-shaped portions, arranges the first plate-shaped portion and the second plate-shaped portion in opposition, and is rotatably attached to the insulating substrate. A variable resistor, wherein the slider slides on the resistor, and the bent wall covers an outer peripheral portion of the resistor.

The variable resistor according to claim 1, wherein the bent wall covers an outer peripheral portion of the slider.

The variable resistor according to claim 2, wherein the bent wall covers an outer peripheral portion of the slider including a contact portion of the slider with the resistor.

The variable resistor according to claim 1, wherein the bent wall is formed in an arc shape by drawing.

The said bent wall was formed in the range of 40% or more of the said whole variable range centering on the center part in the whole variable range of the said arc-shaped resistor, The said Claim 1, 2, or 3, or, or 4. The variable resistor according to 4.