JPH053108A - Hermetically sealed variable resistor - Google Patents
Hermetically sealed variable resistorInfo
- Publication number
- JPH053108A JPH053108A JP29142091A JP29142091A JPH053108A JP H053108 A JPH053108 A JP H053108A JP 29142091 A JP29142091 A JP 29142091A JP 29142091 A JP29142091 A JP 29142091A JP H053108 A JPH053108 A JP H053108A
- Authority
- JP
- Japan
- Prior art keywords
- case
- cover
- rotating body
- variable resistor
- curved portion
- 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
Links
Landscapes
- Adjustable Resistors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電子回路等の抵抗調
整器として適し、内部を外部に対して気密にした密封形
可変抵抗器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed variable resistor suitable as a resistance adjuster for electronic circuits and the like, the inside of which is hermetically sealed from the outside.
【０００２】[0002]
【従来の技術】この種の可変抵抗器は図６に示すよう
に、カバー１１の上板１１ａ中央に軸孔１２が形成さ
れ、合成樹脂からなる回転体１３がカバー１１内に配さ
れ、その軸孔１２より外部に臨んだ一端に操作用溝１４
が形成され、内端面には導電性材料からなるばね性を有
する摺動子１５が取付けられている。前記カバー上板１
１ａの内面と、回転体１３の周面つば部１６との間にゴ
ムからなるＯリング１７を介在させる。回転体１３の内
端面と対向して抵抗基板１８が配され、例えばアルミナ
の抵抗基板１８上に、中央部に集電体１９，その外周部
に抵抗体２１が配され、これらは摺動子１５と摺動接続
することができる。抵抗基板１８の周縁部および底面外
側を囲んで絶縁性合成樹脂材からなるケース２２がモー
ルドにより一体に形成されている。ケース２２に埋め込
まれた端子２３が外部に導出されている。ケース２２の
内周面に抵抗基板１８上に周面に沿ってリング状段部２
４が一体に形成され、段部２４上につば部１６がシリコ
ンゴムなどの弾性絶縁樹脂材のＯリング１７で弾性的に
押さえられる。ケース２２の底板２２ａに形成した凹部
内にケース１１の爪２５が折り曲げ挿入されてケース２
２とカバー１１とが機械的に接合される。2. Description of the Related Art As shown in FIG. 6, a variable resistor of this type has a shaft hole 12 formed in the center of an upper plate 11a of a cover 11 and a rotor 13 made of synthetic resin disposed inside the cover 11. An operation groove 14 is provided at one end facing the outside from the shaft hole 12.
And a slider 15 made of a conductive material and having a spring property is attached to the inner end surface. The cover upper plate 1
An O-ring 17 made of rubber is interposed between the inner surface of the la 1 and the peripheral flange portion 16 of the rotating body 13. A resistance substrate 18 is arranged so as to face the inner end surface of the rotating body 13. For example, a current collector 19 is arranged at the center and a resistance body 21 is arranged at the outer periphery of the resistance substrate 18 made of alumina. It can be slidably connected with 15. A case 22 made of an insulating synthetic resin material is integrally formed by molding so as to surround the peripheral portion of the resistance substrate 18 and the outside of the bottom surface. The terminal 23 embedded in the case 22 is led out to the outside. On the inner peripheral surface of the case 22, the ring-shaped step portion 2 is formed on the resistance substrate 18 along the peripheral surface.
4 is integrally formed, and the flange portion 16 is elastically pressed onto the step portion 24 by the O-ring 17 made of an elastic insulating resin material such as silicon rubber. The claw 25 of the case 11 is bent and inserted into the recess formed in the bottom plate 22a of the case 22 so that the case 2
2 and the cover 11 are mechanically joined.
【０００３】回転体１３は回動可能に支持され、カバー
１１で保持されて密封構造とされている。The rotating body 13 is rotatably supported and is held by a cover 11 to form a hermetically sealed structure.
【０００４】[0004]
【発明が解決しようとする課題】この従来の小形の密封
形可変抵抗器を、プリント基板に半田付けで実装する際
に半田の熱により加熱され、密封構造であるため、ケー
ス２２内の気圧が高まり、回転体１３やカバー１１が変
形することがあった。特に自動半田付けのために半田槽
内でプリント基板に面実装すると約２６０℃の熱が可変
抵抗器本体に伝熱され、ケース２２内の気圧が約1.９気
圧と高くなるため、合成樹脂の回転体１３が金属カバー
１１に強く押しつけられる。When the conventional small sealed variable resistor is mounted on a printed circuit board by soldering, it is heated by the heat of the solder and has a sealed structure. As a result, the rotating body 13 and the cover 11 may be deformed. Especially when surface mounting on a printed circuit board in a solder bath for automatic soldering, heat of about 260 ° C is transferred to the variable resistor body, and the atmospheric pressure in the case 22 rises to about 1.9 atmospheric pressure. The rotating body 13 is strongly pressed against the metal cover 11.
【０００５】このためカバー１１は軸部３１の突出方向
にふくらみ変形する。また、場合によってはカバー１１
が変形しないで回転体１３が押しつぶされて軸方向寸法
が小さくなる。この結果、回転体１３の回転トルクが実
装前に比し、実装後は著しく軽くなる欠点があった。こ
の発明の目的は、プリント基板に半田付けが実装後にお
いても安定した回転トルクが得られるようにした小形の
密封形可変抵抗器を提供することにある。Therefore, the cover 11 is bulged and deformed in the protruding direction of the shaft portion 31. Also, in some cases, the cover 11
Is not deformed, the rotating body 13 is crushed and the axial dimension is reduced. As a result, the rotational torque of the rotating body 13 becomes significantly lighter after mounting than before mounting. An object of the present invention is to provide a small-sized hermetically-sealed variable resistor capable of obtaining a stable rotating torque even after soldering on a printed circuit board.
【０００６】[0006]
【課題を解決するための手段】この発明によれば、カバ
ーは弾性金属板によりなり、湾曲部とその湾曲部から折
り曲げられた対向する一対の取付脚部とから構成され、
湾曲部は回転体の軸部が通される軸孔が形成され、かつ
ケースの開口側端面と対向し、その端面側に凸に湾曲さ
れている。取付脚部はケースと係合し、湾曲部が回転体
を弾圧して抵抗基板側に付勢している。According to the present invention, the cover is made of an elastic metal plate and is composed of a curved portion and a pair of mounting leg portions opposed to each other bent from the curved portion.
The curved portion is formed with a shaft hole through which the shaft portion of the rotating body passes, and faces the opening-side end surface of the case, and is curved convexly on the end surface side. The mounting leg engages with the case, and the curved portion presses the rotating body to urge it toward the resistance substrate.
【０００７】[0007]
【実施例】以下この発明の実施例について、図面を参照
しながら説明する。図１ないし図４は、それぞれこの発
明の実施例を示したものであり、図６と対応する部分に
は同一符号を付けてある。この発明では、カバー１１は
弾性金属板のプレス加工により構成され、ケース２２の
開口側端面と対向する湾曲部１１ａと、湾曲部１１ａの
両側より折り曲げ延長された対向する一対の取付脚部と
よりなり、湾曲部１１ａは軸部３１が通される軸孔１２
が形成され、かつケース２２の開口側端面に対し凸に湾
曲されている。取付脚部がケース２２の側面と係合され
て、湾曲部１１ａの軸孔１２の周縁部により、回転体１
３の上面が弾性的に押さえられ、回転体１３は抵抗基板
１８側に弾性的に偏倚される。その偏倚は回転体１３の
つば部１６がケース２２の段部２４で受けられている。
回転体１３の軸孔１２に挿入された軸部３１の突出によ
りその軸孔１２の基部周縁にカバーの軸孔周縁部と弾性
的に接する受け面３２が回転体１３に形成されている。Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention, and the portions corresponding to those in FIG. 6 are designated by the same reference numerals. In the present invention, the cover 11 is formed by pressing an elastic metal plate, and includes a curved portion 11a that faces the opening-side end surface of the case 22, and a pair of opposing mounting legs that are bent and extended from both sides of the curved portion 11a. The curved portion 11a has a shaft hole 12 through which the shaft portion 31 passes.
Is formed, and is convexly curved with respect to the end surface on the opening side of the case 22. The mounting leg portion is engaged with the side surface of the case 22, and the peripheral portion of the shaft hole 12 of the bending portion 11a causes the rotating body 1 to rotate.
The upper surface of 3 is elastically pressed, and the rotating body 13 is elastically biased to the resistance substrate 18 side. The bias is received by the flange portion 16 of the rotating body 13 by the step portion 24 of the case 22.
Due to the projection of the shaft portion 31 inserted into the shaft hole 12 of the rotating body 13, a receiving surface 32 is formed on the rotating body 13 at the peripheral edge of the base portion of the shaft hole 12 so as to elastically contact the peripheral portion of the shaft hole of the cover.
【０００８】このためケース２２の側面の両側部に、上
下方向で底面側が高くなる段部３４，３５が形成されて
いる。カバー１１は弾性を有する金属板がコ字状に折り
曲げ加工されて作られ、図４に示すように湾曲部１１ａ
は、角周面が四角筒状をしたケース２２の開放を蓋する
ように方形をしており、中央部に軸孔１２が形成され、
その湾曲部１１ａは内側、つまりケース２２側が凸とな
るようにゆるく湾曲されている。湾曲部１１ａの両端の
取付脚部は湾曲部１１ａより下が幅狭とされ、その上部
の幅広部の下縁３６，３７が段部３４，３５とそれぞれ
係合され、下端の爪２５をケース２２の底面凹部に切り
曲げると、この爪２５の底面との係合と、前記段部およ
び下縁の係合とによりカバー１１はケース２２に軸心と
平行な方向が位置決めされて固定される。また湾曲部１
１ａの軸孔１２の周縁部が回転体１３の受け面３２と弾
性的に接触する。図６に示した従来のものにおいては、
カバーの軸孔１２の内周縁部は回転体１３と接触してな
いことに注意すべきである。Therefore, step portions 34 and 35 are formed on both sides of the side surface of the case 22 so that the bottom surface becomes higher in the vertical direction. The cover 11 is made by bending an elastic metal plate into a U shape, and as shown in FIG.
Has a square shape so as to cover the opening of the case 22 having a square tubular surface, and the shaft hole 12 is formed in the center of the case 22.
The curved portion 11a is gently curved so that the inside, that is, the case 22 side is convex. The mounting legs at both ends of the curved portion 11a have a narrower width below the curved portion 11a, the lower edges 36 and 37 of the wide portion of the upper portion thereof are engaged with the stepped portions 34 and 35, respectively, and the claw 25 at the lower end is fitted to the case. When the cover 11 is cut and bent into the bottom surface recessed portion 22, the cover 11 is fixed to the case 22 in a direction parallel to the axis by the engagement with the bottom surface of the claw 25 and the engagement of the step portion and the lower edge. .. Also the curved portion 1
The peripheral portion of the shaft hole 12 of 1a elastically contacts the receiving surface 32 of the rotating body 13. In the conventional device shown in FIG. 6,
It should be noted that the inner peripheral edge of the shaft hole 12 of the cover does not contact the rotating body 13.
【０００９】Ｏリング１７は、回転体１３の周面とケー
ス２２の内周面との間に弾性的に介在されて、可変抵抗
器内部と外部との気密性が保持される。このとき、カバ
ー１１の湾曲部１１ａとＯリング１７とが弾性的に接触
しているが、回転体１３を回転したときのいわゆるバッ
クラッシュ力よりも、カバー１１により回転体１３を押
さえ保持する力が強く、このバックラッシュ力により回
転体１３は回転しない。The O-ring 17 is elastically interposed between the peripheral surface of the rotating body 13 and the inner peripheral surface of the case 22 to maintain airtightness between the inside and outside of the variable resistor. At this time, the curved portion 11a of the cover 11 and the O-ring 17 are elastically in contact with each other, but the force for pressing and holding the rotating body 13 by the cover 11 is larger than the so-called backlash force when the rotating body 13 is rotated. Is strong, and the backlash force prevents the rotating body 13 from rotating.
【００１０】なお、必要に応じて回転体１３の外面に弗
素系潤滑処理剤が塗布乾燥されて、回転体１３とカバー
１１の接触が互いに滑らかに、回転体１３を回転したと
きのトルクむらや、キシミ音の発生を防止できるように
することが好ましい。組立てはケース２２の開口内側で
回転体１３を、導電性材の摺動子１５の先端が抵抗体２
１および集電体１９を摺動し回転可能に挿入され、Ｏリ
ング１７を回転体１３とケース２２とで形成される凹部
に挿入し、カバー１１の軸孔１２に軸部３１を挿通し
て、カバー１１の両肩、つまり下縁３６，３７をケース
２２の段部３４，３５に押圧しながら、ケース２２の下
面側で、カバー１１の爪２５を内側に折り曲げて固着さ
れる。組立後のカバー１１の湾曲部１１ａは回転体１３
の受け面３２と接合して図５の一点鎖線の状態からほゞ
平らとなる。If necessary, a fluorine-based lubricating treatment agent is applied to the outer surface of the rotating body 13 and dried so that the contact between the rotating body 13 and the cover 11 is smooth and the torque unevenness when the rotating body 13 is rotated. It is preferable to prevent generation of squeak noise. For assembly, the rotor 13 is placed inside the opening of the case 22, and the tip end of the slider 15 made of a conductive material is the resistor 2
1 and the current collector 19 are slidably inserted, the O-ring 17 is inserted into the recess formed by the rotary body 13 and the case 22, and the shaft portion 31 is inserted into the shaft hole 12 of the cover 11. While pressing both shoulders of the cover 11, that is, the lower edges 36 and 37 against the stepped portions 34 and 35 of the case 22, the claws 25 of the cover 11 are bent and fixed inward on the lower surface side of the case 22. The curved portion 11a of the cover 11 after assembly is the rotating body 13
It becomes almost flat from the state of the one-dot chain line in FIG.
【００１１】以上のように構成されたこの発明の一実施
例の可変抵抗器は、ドライバー等を操作用溝１４に嵌合
させて回動すれば、共回りする摺動子１５が抵抗体２１
上を摺動して、端子２３間で所望の抵抗値が得られる。In the variable resistor of one embodiment of the present invention constructed as described above, when the driver or the like is fitted into the operation groove 14 and is rotated, the slider 15 which co-rotates is the resistor 21.
Sliding up, a desired resistance value is obtained between the terminals 23.
【００１２】[0012]
【発明の効果】以上述べたように、この発明によればカ
バー１１が弾性金属板で構成され、湾曲部１１ａで回転
体１３を弾性的に押さえているため、プリント基板に半
田付け実装する際に全体が加熱され、密封構造のために
ケース２２内の気圧が高くなるが、湾曲部１１ａが弾性
変形して、これが永久変形するおそれがなく、かつ回転
体１３が押しつぶされるおそれもない。従って、その実
装後においても回転体１３に対するトルクは実装前と同
一であり、安定した回転トルクが得られる。As described above, according to the present invention, the cover 11 is made of an elastic metal plate, and the curved portion 11a elastically presses the rotating body 13, so that it is mounted on the printed circuit board by soldering. Since the whole is heated and the air pressure in the case 22 is increased due to the sealed structure, there is no possibility that the curved portion 11a is elastically deformed and permanently deformed, and there is no possibility that the rotating body 13 is crushed. Therefore, even after the mounting, the torque on the rotating body 13 is the same as that before the mounting, and a stable rotating torque can be obtained.
【００１３】従来のカバーでは半田付け性試験等で２６
０℃，１０秒間以上半田槽中に浸漬した場合、内圧の上
昇により、カバーの中心部が持ち上がって、回転トルク
が減少する場合が生じることもあったが、この発明の可
変抵抗器では回転トルクの減少は全くなかった。なお、
カバー１１がその両脚にてケース２２の側面と軸心方向
で係合位置決めされる場合は、回転体１３がカバー１１
の軸孔近辺で回転体受け面３２が弾力で押圧され、カバ
ー１１と回転体１３と一定間隔をもって挾持されたＯリ
ング１７は歪応力を、回転体１３とケース２２との間の
摩擦で発生する回転トルク内で解消するため、バックラ
ッシュもほとんどなく、かつ爪２５の折り曲げ強度に無
関係に製品によるばらつきがなく、回転体をほゞ所定の
圧力で押圧することができ、好ましい回転トルクとする
ことができる。また回転体１３の表面潤滑処理する場合
は、回転むら、キシミ音等も解消される。In the case of the conventional cover, the solderability test, etc.
When immersed in a solder bath at 0 ° C. for 10 seconds or more, the center of the cover may be lifted due to an increase in internal pressure, which may reduce the rotating torque. With the variable resistor of the present invention, however, the rotating torque may decrease. There was no decrease in In addition,
When the cover 11 is engaged and positioned by its both legs with the side surface of the case 22 in the axial direction, the rotating body 13 covers the cover 11.
The rotor receiving surface 32 is elastically pressed in the vicinity of the shaft hole, and the O-ring 17 sandwiched between the cover 11 and the rotor 13 at a constant interval generates strain stress due to friction between the rotor 13 and the case 22. Since there is no backlash and there is no variation depending on the product regardless of the bending strength of the claw 25, the rotating body can be pressed at a predetermined pressure, and a preferable rotating torque is obtained. be able to. Further, when the surface of the rotating body 13 is lubricated, uneven rotation, squeaking noise, etc. are eliminated.
【図１】この発明の一実施例を示す斜視図。FIG. 1 is a perspective view showing an embodiment of the present invention.
【図２】図１の平面図。FIG. 2 is a plan view of FIG.
【図３】図２の側断面図。FIG. 3 is a side sectional view of FIG.
【図４】カバー１１の斜視図。FIG. 4 is a perspective view of a cover 11.
【図５】カバー内周縁部と回転体とＯリングとの関係の
一部を示す拡大断面図。FIG. 5 is an enlarged cross-sectional view showing a part of the relationship between the inner peripheral edge of the cover, the rotating body, and the O-ring.
【図６】従来の可変抵抗器を示す側断面図。FIG. 6 is a side sectional view showing a conventional variable resistor.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成３年１１月２８日[Submission date] November 28, 1991
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】発明の詳細な説明[Name of item to be amended] Detailed explanation of the invention
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】この発明は、電子回路等の抵抗調
整器として適し、内部を外部に対して気密にした密封形
可変抵抗器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed variable resistor suitable as a resistance adjuster for electronic circuits and the like, the inside of which is hermetically sealed from the outside.
【０００２】[0002]
【従来の技術】この種の可変抵抗器は図６に示すよう
に、カバー１１の上板１１ａ中央に軸孔１２が形成さ
れ、合成樹脂からなる回転体１３がカバー１１内に配さ
れ、その軸孔１２より外部に臨んだ一端に操作用溝１４
が形成され、内端面には導電性材料からなるばね性を有
する摺動子１５が取付けられている。前記カバー上板１
１ａの内面と、回転体１３の周面つば部１６との間にゴ
ムからなるＯリング１７を介在させる。回転体１３の内
端面と対向して抵抗基板１８が配され、例えばアルミナ
の抵抗基板１８上に、中央部に集電体１９，その外周部
に抵抗体２１が配され、これらは摺動子１５と摺動接続
することができる。抵抗基板１８の周縁部および底面外
側を囲んで絶縁性合成樹脂材からなるケース２２がモー
ルドにより一体に形成されている。ケース２２に埋め込
まれた端子２３が外部に導出されている。ケース２２の
内周面に抵抗基板１８上に周面に沿ってリング状段部２
４が一体に形成され、段部２４上につば部１６がシリコ
ンゴムなどの弾性絶縁樹脂材のＯリング１７で弾性的に
押さえられる。ケース２２の底板２２ａに形成した凹部
内にケース１１の爪２５が折り曲げ挿入されてケース２
２とカバー１１とが機械的に接合される。2. Description of the Related Art As shown in FIG. 6, a variable resistor of this type has a shaft hole 12 formed in the center of an upper plate 11a of a cover 11 and a rotor 13 made of synthetic resin disposed inside the cover 11. An operation groove 14 is provided at one end facing the outside from the shaft hole 12.
And a slider 15 made of a conductive material and having a spring property is attached to the inner end surface. The cover upper plate 1
An O-ring 17 made of rubber is interposed between the inner surface of the la 1 and the peripheral flange portion 16 of the rotating body 13. A resistance substrate 18 is arranged so as to face the inner end surface of the rotating body 13. For example, a current collector 19 is arranged at the center and a resistance body 21 is arranged at the outer periphery of the resistance substrate 18 made of alumina. It can be slidably connected with 15. A case 22 made of an insulating synthetic resin material is integrally formed by molding so as to surround the peripheral portion of the resistance substrate 18 and the outside of the bottom surface. The terminal 23 embedded in the case 22 is led out to the outside. On the inner peripheral surface of the case 22, the ring-shaped step portion 2 is formed on the resistance substrate 18 along the peripheral surface.
4 is integrally formed, and the flange portion 16 is elastically pressed onto the step portion 24 by the O-ring 17 made of an elastic insulating resin material such as silicon rubber. The claw 25 of the case 11 is bent and inserted into the recess formed in the bottom plate 22a of the case 22 so that the case 2
2 and the cover 11 are mechanically joined.
【０００３】回転体１３は回動可能に支持され、カバー
１１で保持されて密封構造とされている。The rotating body 13 is rotatably supported and is held by a cover 11 to form a hermetically sealed structure.
【０００４】[0004]
【発明が解決しようとする課題】この従来の小形の密封
形可変抵抗器を、プリント基板に半田付けで実装する際
に半田の熱により加熱され、密封構造であるため、ケー
ス２２内の気圧が高まり、回転体１３やカバー１１が変
形することがあった。特に自動半田付けのために半田槽
内でプリント基板に面実装すると約２６０℃の熱が可変
抵抗器本体に伝熱され、ケース２２内の気圧が約1.９気
圧と高くなるため、合成樹脂の回転体１３が金属カバー
１１に強く押しつけられる。When the conventional small sealed variable resistor is mounted on a printed circuit board by soldering, it is heated by the heat of the solder and has a sealed structure. As a result, the rotating body 13 and the cover 11 may be deformed. Especially when surface mounting on a printed circuit board in a solder bath for automatic soldering, heat of about 260 ° C is transferred to the variable resistor body, and the atmospheric pressure in the case 22 rises to about 1.9 atmospheric pressure. The rotating body 13 is strongly pressed against the metal cover 11.
【０００５】このためカバー１１は軸部３１の突出方向
にふくらみ変形する。また、場合によってはカバー１１
が変形しないで回転体１３が押しつぶされて軸方向寸法
が小さくなる。この結果、回転体１３の回転トルクが実
装前に比し、実装後は著しく軽くなる欠点があった。こ
の発明の目的は、プリント基板に半田付けが実装後にお
いても安定した回転トルクが得られるようにした小形の
密封形可変抵抗器を提供することにある。Therefore, the cover 11 is bulged and deformed in the protruding direction of the shaft portion 31. Also, in some cases, the cover 11
Is not deformed, the rotating body 13 is crushed and the axial dimension is reduced. As a result, the rotational torque of the rotating body 13 becomes significantly lighter after mounting than before mounting. An object of the present invention is to provide a small-sized hermetically-sealed variable resistor capable of obtaining a stable rotating torque even after soldering on a printed circuit board.
【０００６】[0006]
【課題を解決するための手段】この発明によれば、カバ
ーは弾性金属板によりなり、湾曲部とその湾曲部から折
り曲げられた対向する一対の取付脚部とから構成され、
湾曲部は回転体の軸部が通される軸孔が形成され、かつ
ケースの開口側端面と対向し、その端面側に凸に湾曲さ
れている。取付脚部はケースと係合し、湾曲部が回転体
を弾圧して抵抗基板側に付勢している。According to the present invention, the cover is made of an elastic metal plate and is composed of a curved portion and a pair of mounting leg portions opposed to each other bent from the curved portion.
The curved portion is formed with a shaft hole through which the shaft portion of the rotating body passes, and faces the opening-side end surface of the case, and is curved convexly on the end surface side. The mounting leg engages with the case, and the curved portion presses the rotating body to urge it toward the resistance substrate.
【０００７】[0007]
【実施例】以下この発明の実施例について、図面を参照
しながら説明する。図１ないし図４は、それぞれこの発
明の実施例を示したものであり、図６と対応する部分に
は同一符号を付けてある。この発明では、カバー１１は
弾性金属板のプレス加工により構成され、ケース２２の
開口側端面と対向する湾曲部１１ａと、湾曲部１１ａの
両側より折り曲げ延長された対向する一対の取付脚部と
よりなり、湾曲部１１ａは軸部３１が通される軸孔１２
が形成され、かつケース２２の開口側端面に対し凸に湾
曲されている。この湾曲の軸心は、湾曲部１１ａと取付
脚部との各折り曲げ角とほゞ平行している。取付脚部が
ケース２２の側面と係合されて、湾曲部１１ａの軸孔１
２の周縁部により、回転体１３の上面が弾性的に押さえ
られ、回転体１３は抵抗基板１８側に弾性的に偏倚され
る。その偏倚は回転体１３のつば部１６がケース２２の
段部２４で受けられている。回転体１３の軸孔１２に挿
入された軸部３１の突出によりその軸孔１２の基部周縁
にカバーの軸孔周縁部と弾性的に接する受け面３２が回
転体１３に形成されている。Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention, and the portions corresponding to those in FIG. 6 are designated by the same reference numerals. In the present invention, the cover 11 is formed by pressing an elastic metal plate, and includes a curved portion 11a that faces the opening-side end surface of the case 22, and a pair of opposing mounting legs that are bent and extended from both sides of the curved portion 11a. The curved portion 11a has a shaft hole 12 through which the shaft portion 31 passes.
Is formed, and is convexly curved with respect to the end surface on the opening side of the case 22. The axis of this curve is attached to the curve part 11a.
It is almost parallel to each fold angle with the legs. The mounting leg is engaged with the side surface of the case 22, and the shaft hole 1 of the bending portion 11a is formed.
The peripheral edge of 2 elastically presses the upper surface of the rotating body 13, so that the rotating body 13 is elastically biased toward the resistance substrate 18. The bias is received by the flange portion 16 of the rotating body 13 by the step portion 24 of the case 22. Due to the projection of the shaft portion 31 inserted into the shaft hole 12 of the rotating body 13, a receiving surface 32 is formed on the rotating body 13 at the peripheral edge of the base portion of the shaft hole 12 so as to elastically contact the peripheral portion of the shaft hole of the cover.
【０００８】このためケース２２の側面の両側部に、上
下方向で底面側が高くなる段部３４，３５が形成されて
いる。カバー１１は弾性を有する金属板がコ字状に折り
曲げ加工されて作られ、図４に示すように湾曲部１１ａ
は、角周面が四角筒状をしたケース２２の開放を蓋する
ように方形をしており、中央部に軸孔１２が形成され、
その湾曲部１１ａは内側、つまりケース２２側が凸とな
るようにゆるく湾曲されている。湾曲部１１ａの両端の
取付脚部の下部は湾曲部１１ａより幅狭とされ、その上
部の幅広部の下縁３６，３７が段部３４，３５とそれぞ
れ係合され、下端の爪２５をケース２２の底面凹部に切
り曲げると、この爪２５の底面との係合と、前記段部お
よび下縁の係合とによりカバー１１はケース２２に軸心
と平行な方向が位置決めされて固定される。また湾曲部
１１ａの軸孔１２の周縁部が回転体１３の受け面３２と
弾性的に接触する。図６に示した従来のものにおいて
は、カバーの軸孔１２の内周縁部は回転体１３と接触し
てないことに注意すべきである。Therefore, step portions 34 and 35 are formed on both sides of the side surface of the case 22 so that the bottom surface becomes higher in the vertical direction. The cover 11 is made by bending an elastic metal plate into a U shape, and as shown in FIG.
Has a square shape so as to cover the opening of the case 22 having a square tubular surface, and the shaft hole 12 is formed in the center of the case 22.
The curved portion 11a is gently curved so that the inside, that is, the case 22 side is convex. Bottom of the mounting leg portions at both ends of the curved portion 11a is a Ri narrow by the curved portion 11a, the lower edge 36, 37 of the wide portion of the upper are respectively engaged with the step portions 34 and 35, the pawl 25 of the lower end When the cover 11 is cut and bent into a recessed portion on the bottom surface of the case 22, the cover 11 is fixed to the case 22 in a direction parallel to the axis by the engagement with the bottom surface of the claw 25 and the engagement of the step and the lower edge. It Further, the peripheral portion of the shaft hole 12 of the curved portion 11a elastically contacts the receiving surface 32 of the rotating body 13. It should be noted that in the conventional structure shown in FIG. 6, the inner peripheral edge of the shaft hole 12 of the cover is not in contact with the rotating body 13.
【０００９】Ｏリング１７は、回転体１３の周面とケー
ス２２の内周面との間に弾性的に介在されて、可変抵抗
器内部と外部との気密性が保持される。このとき、カバ
ー１１の湾曲部１１ａとＯリング１７とが弾性的に接触
しているため、回転体１３を回転し停止させたとき、前
記弾性的接触に基因したいわゆるバックラッシュが生じ
ようとするが、カバー１１の湾曲部１１ａとケースの段
部２４とにより回転体１３が弾性的に強く挟持されてい
るため、バックラッシュは生じない。The O-ring 17 is elastically interposed between the peripheral surface of the rotating body 13 and the inner peripheral surface of the case 22 to maintain airtightness between the inside and outside of the variable resistor. At this time, since the curved portion 11a and the O-ring 17 of the cover 11 are elastically contacted, when rotating the rotary member 13 is stopped, before
The so-called backlash caused by the elastic contact
However , the curved portion 11a of the cover 11 and the step of the case
The rotating body 13 is elastically strongly sandwiched by the portion 24.
Therefore, backlash does not occur .
【００１０】なお、必要に応じて回転体１３の外面に弗
素系潤滑処理剤が塗布乾燥されて、回転体１３とカバー
１１の接触が互いに滑らかに、回転体１３を回転したと
きのトルクむらや、キシミ音の発生を防止できるように
することが好ましい。組立てはケース２２の開口内側で
回転体１３を、導電性材の摺動子１５の先端が抵抗体２
１および集電体１９を摺動し回転可能に挿入され、Ｏリ
ング１７を回転体１３とケース２２とで形成される凹部
に挿入し、カバー１１の軸孔１２に軸部３１を挿通し
て、カバー１１の両肩、つまり下縁３６，３７をケース
２２の段部３４，３５に押圧しながら、ケース２２の下
面側で、カバー１１の爪２５を内側に折り曲げて固着さ
れる。組立後のカバー１１の湾曲部１１ａは回転体１３
の受け面３２と接合して図５の一点鎖線の状態からほゞ
平らとなる。If necessary, a fluorine-based lubricating treatment agent is applied to the outer surface of the rotating body 13 and dried so that the contact between the rotating body 13 and the cover 11 is smooth and the torque unevenness when the rotating body 13 is rotated. It is preferable to prevent generation of squeak noise. For assembly, the rotor 13 is placed inside the opening of the case 22, and the tip end of the slider 15 made of a conductive material is the resistor 2
1 and the current collector 19 are slidably inserted, the O-ring 17 is inserted into the recess formed by the rotary body 13 and the case 22, and the shaft portion 31 is inserted into the shaft hole 12 of the cover 11. While pressing both shoulders of the cover 11, that is, the lower edges 36 and 37 against the stepped portions 34 and 35 of the case 22, the claws 25 of the cover 11 are bent and fixed inward on the lower surface side of the case 22. The curved portion 11a of the cover 11 after assembly is the rotating body 13
It becomes almost flat from the state of the one-dot chain line in FIG.
【００１１】以上のように構成されたこの発明の一実施
例の可変抵抗器は、ドライバー等を操作用溝１４に嵌合
させて回動すれば、共回りする摺動子１５が抵抗体２１
上を摺動して、端子２３間で所望の抵抗値が得られる。In the variable resistor of one embodiment of the present invention constructed as described above, when the driver or the like is fitted into the operation groove 14 and is rotated, the slider 15 which co-rotates is the resistor 21.
Sliding up, a desired resistance value is obtained between the terminals 23.
【００１２】[0012]
【発明の効果】以上述べたように、この発明によればカ
バー１１が弾性金属板で構成され、湾曲部１１ａで回転
体１３を弾性的に押さえているため、プリント基板に半
田付け実装する際に全体が加熱され、密封構造のために
ケース２２内の気圧が高くなるが、湾曲部１１ａが弾性
変形して、これが永久変形するおそれがなく、かつ回転
体１３が押しつぶされるおそれもない。従って、その実
装後においても回転体１３に対するトルクは実装前と同
一であり、安定した回転トルクが得られる。As described above, according to the present invention, the cover 11 is made of an elastic metal plate, and the curved portion 11a elastically presses the rotating body 13, so that it is mounted on the printed circuit board by soldering. Since the whole is heated and the air pressure in the case 22 is increased due to the sealed structure, there is no possibility that the curved portion 11a is elastically deformed and permanently deformed, and there is no possibility that the rotating body 13 is crushed. Therefore, even after the mounting, the torque on the rotating body 13 is the same as that before the mounting, and a stable rotating torque can be obtained.
【００１３】従来のカバーでは半田付け性試験等で２６
０℃，１０秒間以上半田槽中に浸漬した場合、内圧の上
昇により、カバーの中心部が持ち上がって、回転トルク
が減少する場合が生じることもあったが、この発明の可
変抵抗器では回転トルクの減少は全くなかった。なお、
回転体１３はカバー１１の湾曲部１１ａとケース２２の
段部２４とにより弾性的に挟持されているから、Ｏリン
グ１７によるバックラッシュもほとんどない。 In the case of the conventional cover, the solderability test, etc.
When immersed in a solder bath at 0 ° C. for 10 seconds or more, the center of the cover may be lifted due to an increase in internal pressure, which may reduce the rotating torque. With the variable resistor of the present invention, however, the rotating torque may decrease. There was no decrease in In addition,
The rotating body 13 includes the curved portion 11 a of the cover 11 and the case 22.
From being elastically held between the stepped portion 24, backlash almost have by O-ring 17.
Claims (1)
記ケース内に固着された抵抗基板と、前記抵抗基板に形
成された集電体および抵抗体と、前記ケース内に回動自
在に保持され、前記集電体および抵抗体と摺動接触する
摺動子を備えた回転体と、前記ケースの開口を閉鎖する
カバーと、前記カバーと前記回転体との間に配置された
Ｏリングと、を具備する密封形可変抵抗器において、前
記カバーは弾性金属板からなり、前記回転体の軸部が通
される軸孔を有し、前記ケースの開口側端面と対向し、
その端面側に凸に湾曲された湾曲部と、その湾曲部から
折り曲げられた対向する一対の取付脚部とを備え、前記
取付脚部が前記ケースと係合し、前記湾曲部が前記回転
体を弾圧して前記抵抗基板側に付勢していることを特徴
とする密封形可変抵抗器。Claim: What is claimed is: 1. A case having an opening at one end surface thereof, a resistance substrate fixed in the case, a current collector and a resistor formed on the resistance substrate, and the case. A rotary body that is rotatably held inside and that includes a slider that makes sliding contact with the current collector and the resistor; a cover that closes the opening of the case; and a cover between the cover and the rotary body. In the hermetically-sealed variable resistor, the cover is made of an elastic metal plate, has a shaft hole through which the shaft portion of the rotating body passes, and has an opening-side end surface of the case. Opposite
A curved portion that is convexly curved toward the end surface side and a pair of opposing mounting leg portions that are bent from the curved portion are provided, the mounting leg portion engages with the case, and the curved portion includes the rotating body. A hermetically sealed variable resistor, characterized in that it is biased to urge it toward the resistance substrate side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29142091A JPH07107881B2 (en) | 1991-11-07 | 1991-11-07 | Sealed variable resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29142091A JPH07107881B2 (en) | 1991-11-07 | 1991-11-07 | Sealed variable resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH053108A true JPH053108A (en) | 1993-01-08 |
| JPH07107881B2 JPH07107881B2 (en) | 1995-11-15 |
Family
ID=17768650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29142091A Expired - Fee Related JPH07107881B2 (en) | 1991-11-07 | 1991-11-07 | Sealed variable resistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07107881B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100350183B1 (en) * | 1999-07-30 | 2002-08-27 | 가부시키가이샤 무라타 세이사쿠쇼 | Variable Resistor |
| JP2002299106A (en) * | 2001-04-02 | 2002-10-11 | Murata Mfg Co Ltd | Variable resistor |
| US6725965B2 (en) | 1999-07-28 | 2004-04-27 | Kayaba Industry Co., Ltd. | Stable electric power steering system |
| US6744347B2 (en) | 2001-01-04 | 2004-06-01 | Murata Manufacturing Co., Ltd. | Variable resistor |
| DE10100279B4 (en) * | 2000-01-04 | 2012-09-06 | Murata Manufacturing Co., Ltd. | Variable resistance |
-
1991
- 1991-11-07 JP JP29142091A patent/JPH07107881B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6725965B2 (en) | 1999-07-28 | 2004-04-27 | Kayaba Industry Co., Ltd. | Stable electric power steering system |
| KR100350183B1 (en) * | 1999-07-30 | 2002-08-27 | 가부시키가이샤 무라타 세이사쿠쇼 | Variable Resistor |
| DE10100279B4 (en) * | 2000-01-04 | 2012-09-06 | Murata Manufacturing Co., Ltd. | Variable resistance |
| US6744347B2 (en) | 2001-01-04 | 2004-06-01 | Murata Manufacturing Co., Ltd. | Variable resistor |
| JP2002299106A (en) * | 2001-04-02 | 2002-10-11 | Murata Mfg Co Ltd | Variable resistor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07107881B2 (en) | 1995-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4144648A (en) | Connector | |
| US6380841B2 (en) | Variable resistor | |
| JP7487286B2 (en) | Capacitor | |
| JPH053108A (en) | Hermetically sealed variable resistor | |
| US6731194B1 (en) | Rotary sensor in which sensor rotation shaft is prevented from becoming eccentric | |
| JP3489492B2 (en) | Variable resistor | |
| USRE33627E (en) | Variable resistor | |
| US3996549A (en) | Electrical control and mechanical coupling therefor | |
| US2958839A (en) | Variable resistor | |
| US6744347B2 (en) | Variable resistor | |
| JP3440884B2 (en) | Variable resistor | |
| JPH0325366Y2 (en) | ||
| JP4945848B2 (en) | Variable resistor | |
| JPH1041191A (en) | Variable capacitor and lc composite device employing it | |
| JP2602419Y2 (en) | Semi-fixed variable resistor | |
| JP3565164B2 (en) | Variable electronic components | |
| KR100230705B1 (en) | Electric parts | |
| JP2997181B2 (en) | Rotary variable resistor | |
| JPH10149907A (en) | Variable resistor | |
| US6933830B2 (en) | Variable resistor | |
| JP3458779B2 (en) | Variable resistor | |
| JPH075601Y2 (en) | Variable resistor | |
| GB2087153A (en) | Dielectric support in a trimmer capacitor | |
| EP1098327A2 (en) | Variable resistor | |
| JP2001118654A (en) | Holder for semiconductor device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |