【０００１】
【発明の属する技術分野】
本発明は、パルススイッチ、可変抵抗器等の回転型電気部品に係り、特に、軸の基体への取付構造に関する。
【０００２】
【従来の技術】
従来のこの種の回転型電気部品は、図７ー図９に示すように、合成樹脂から成る軸３０には、鍔部３１と円筒部３２を設け、鍔部３１には、摺動子３３を固着している。
また、絶縁基板３４には、抵抗体３５と導電体３６とが形成され、絶縁基板３４の裏面に、導電体３６に導通する端子３７と抵抗体３５に導通する一対の端子３８とが取り付けられている。
そして、絶縁基板３４の孔３４ａに軸３０の円筒部３２を挿通し、円筒部３２の端部を加熱された治具（図示せず）で広げて、軸３０を絶縁基板３４に回転可能に取り付け、軸３０の回転により、摺動子３３を抵抗体３５と導電体３６に摺動させて、抵抗値の調整を行うようになっている。
【０００３】
【発明が解決しようとする課題】
従来の回転型電気部品においては、軸３０に円筒部３２を設け、円筒部３２の全周を広げるようにしたものであるため、円筒部３２は、広げられた際、亀裂を生じ、強度が弱くなるばかりか、この亀裂部が回転時、絶縁基板３４に接して、軸３０の回転を悪くするものであった。
また、広げられた円筒部３２は、全周において、元に戻ろうとする応力が働き、軸３０の絶縁基板３４への取付強度が弱いという問題があり、特に、高温の環境下においてこの問題が顕著である。
また、円筒部３２は、軸３０を絶縁基板３４に取り付けるためのものであり、軸３０に節度を持たせるためのクリック機構を付加する場合、そのクリック機構を軸３０の前面部に設けることとなり、その構成が複雑で大型となると言う問題がある。
【０００４】
【課題を解決するための手段】
上記課題を解決するための解決手段として、底壁に孔と該底壁の裏面に凹凸部を有する基体と、内部が空洞をなし端部に割部を設けた筒部と鍔部とを有する合成樹脂から成る回転可能な軸と、前記筒部を挿通する孔と該孔内に位置する折り曲げ部と前記凹凸部に係合する凸部を設けた板バネとを備え、前記基体の表面と前記鍔部の何れか一方には摺動子が設けられ、他方には前記摺動子が摺接する接点、或いは抵抗体等の電気素子が設けられると共に、前記板バネは、リング状をなし、環状の溝を設けて外環部と内環部とを形成し、前記外環部には前記凸部を設けると共に、前記内環部には、前記軸の軸方向に延びる前記折り曲げ部が設けられ、前記底壁の前記孔に挿通された前記軸の前記割部に前記板バネの前記折り曲げ部を嵌合させ、前記筒部の先端を広げて該筒部に前記板バネを固着し、前記板バネと前記鍔部との間に前記底壁を位置させて、前記軸と前記板バネを前記基体に取り付けると共に、前記板バネの前記折り曲げ部を前記基体の前記孔内に位置する前記割部内に係止して前記板バネを前記軸に対して回り止めして保持した構成とした。
【０００５】
【発明の実施の形態】
本発明における回転型電気部品の一実施例を、図１ー図６に基づいて説明する。
図１ー図６に示すものは、回転型電気部品の一つであるパルススイッチであって、合成樹脂の成型品から成る基体１は、円形の孔１ａを有する底壁１ｂと、凹部１ｃを有する側壁１ｄと、前記底壁１ｂの裏面において、孔１ａの周囲に設けられた凹凸部１ｅとを有している。
また、基体１には、底壁１ｂの上面に一部が露出し、また、一部が側壁１ｄから外部に突出するように、薄い金属板から成る複数の導電板２が埋設されている。
そして、底壁１ｂ上面に露出した部分は接点２ａ、側壁１ｄから突出した部分は端部がく字状に折り曲げられた端子部２ｂと成っている。
【０００６】
また、導電板２は、図４ー図６に示すように、フープ材から成る薄い金属板を打ち抜きして、接点２ａと端子部２ｂを形づけ、図４において、端子部２ｂと成る基部Ｋ１の長手方向の折り曲げ線ＡとＢにおいて、基部Ｋ１の両側部Ｋ２，Ｋ３を、基部Ｋ１に重なるように同一面側に折り曲げることによって、図５に示すような導電板２を形成する。
これによって、端子部２ｂの強度を大きくし、プリント基板の孔（図示せず）への挿入と、スナップ止めを確実にしている。
そして、このような状態において、この導電板２を、合成樹脂の基体１に、接点２ａが底壁１ｂ上に露出し、端子部２ｂの根本部が基体１内に位置するように埋設されて、図６に示すような部材を作り、連結部Ｒを基体１から切断することによって、基体１が形成される。
このように、端子部２ｂの根本部が基体１に埋設されることによって、更に、端子部２ｂの強度を上げることが出来る。
【０００７】
また、合成樹脂から成り、内部が空洞をなした軸３は、円形状の鍔部３ａと、先端に一対の割部３ｂを有する筒部３ｃと、鍔部３ａ内に設けられた突起３ｄとを備え、また、金属板から成る摺動子４は、切り起こしされて形成された接片４ａと、孔４ｂとを有し、この摺動子４は、軸３の突起３ｄを孔４ｂに挿通して、突起３ｄの先端をカシメて、軸３に取り付けられている。
そして、軸３は、摺動子４を底壁１ｂ上の接点２ａに対向させ、且つ、鍔部３ａが凹部１ｃに位置する状態で、筒部３ｃが基体１の孔１ａに挿通されている。
【０００８】
また、金属板、プラスチック等から成るリング状の板バネ５は、環状の溝５ａを設けて外環部５ｂと内環部５ｃとを形成し、その外環部５ｂには凸部５ｄを設けると共に、内環部５ｃには軸３方向の一対の折り曲げ部５ｅが、孔５ｆに位置するように設けられている。
そして、この板バネ５は、折り曲げ部５ｅを軸３の割部３ｂに位置させて、回転方向の回り止めがなされ、また、孔５ｆ内に軸３の筒部３ｃを挿通し、筒部３ｃの端部を加熱された治具（図示せず）で外方に広げ、広げられた部分で内環部５ｃの一面に係止し、内環部５ｃの他面を基体１の裏面に当接して、板バネ５と軸３が基体１に取り付けられる。
【０００９】
そして、取り付けられた際は、図１に示すように、摺動子４の接片４ａは、導電板２の接点２ａに接触し、また、板バネ５の凸部５ｄが基体１の裏面に設けられた凹凸部１ｅに当接した状態となってクリック部が形成されている。
そして、このような回転型電気部品は、く字状の端子部２ｂをプリント基板（図示せず）にスナップインされて取り付けられ、その端部を配線パターンに半田付けして固着される。
軸３を回転すると、摺動子４が導電板２の接点２ａ上を摺動して、所望のパルス信号を得ると共に、板バネ５は基体１の裏面に摺接しながら軸３と共に回転し、凸部５ｄが凹凸部１ｅ上を摺接して、軸３にクリック動作を行わしめている。
【００１０】
上述の実施例では、摺動子が接点に摺接するもので説明したが、接点、或いは抵抗体などの電気素子に、摺動子を摺接するものであれば良く、また、クリック部を設けたもので説明したが、クリック部のないものでも良い。
【００１１】
【発明の効果】
本発明の回転型電気部品によれば、基体に合成樹脂製の軸の円筒部端部を広げて固定する構造において、円筒部の先端に割部を設け、円筒部端部の広がった部分と基体との間にクリック用の板バネを挟持するようにしたので、かしめ部に亀裂を生じることが無く、かしめ部の亀裂が基体と摺動すること、あるいは亀裂に伴なってかしめ部の強度が低下するのを防止でき、また、板バネが基体の裏面に当接するようになるため、軸回転のすべりが良く、円滑な軸の回転を得ることが出来る。
また、軸は、板バネを介して基体に保持されているため、広げられた円筒部が高温の環境下で元に戻ろうとする応力が生じたとしても、板バネがこの戻りによる緩みを無くし、取り付け強度が弱くなるのを防止できる。
また、板バネに、クリック用の凸部と、軸と共回りするための係止部となる折り曲げ部を設けたので、板バネの位置決めを、基体の孔内に位置する軸の割部で兼用することができ、コンパクトで且つ確実に、軸とクリック用の凸部を設けた板バネを、軸とともに共回り可能に保持できる。
【図面の簡単な説明】
【図１】本発明の回転型電気部品の断面図。
【図２】本発明の回転型電気部品の分解斜視図。
【図３】本発明の回転型電気部品に係り、軸の要部斜視図。
【図４】本発明の回転型電気部品に係り、端子部の形成方法を示す説明図。
【図５】本発明の回転型電気部品に係り、端子部の形成方法を示す説明図。
【図６】本発明の回転型電気部品に係り、端子部の形成方法を示す説明図。
【図７】従来の回転型電気部品の断面図。
【図８】従来の回転型電気部品の斜視図。
【図９】従来の回転型電気部品の軸の斜視図。
【符号の説明】
１ 基体
１ａ 孔
１ｂ 底壁
１ｃ 凹部
１ｄ 側壁
１ｅ 凹凸部
２ 導電板
２ａ 接点
２ｂ 端子部
３ 軸
３ａ 鍔部
３ｂ 割部
３ｃ 筒部
３ｄ 突起
４ 摺動子
４ａ 接片
４ｂ 孔
５ 板バネ
５ａ 溝
５ｂ 外環部
５ｃ 内環部
５ｄ 凸部
５ｅ 折り曲げ部
５ｆ 孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to rotating electrical components such as pulse switches and variable resistors, and more particularly to a structure for mounting a shaft to a base.
[0002]
[Prior art]
As shown in FIGS. 7 to 9, this type of conventional rotary electric component is provided with a flange 31 and a cylindrical portion 32 on a shaft 30 made of synthetic resin, and a slider 33 is provided on the flange 31. Is fixed.
In addition, a resistor 35 and a conductor 36 are formed on the insulating substrate 34, and a terminal 37 conducting to the conductor 36 and a pair of terminals 38 conducting to the resistor 35 are attached to the back surface of the insulating substrate 34. ing.
Then, the cylindrical portion 32 of the shaft 30 is inserted into the hole 34 a of the insulating substrate 34, and the end of the cylindrical portion 32 is spread with a heated jig (not shown) so that the shaft 30 can be rotated to the insulating substrate 34. By attaching and rotating the shaft 30, the slider 33 is slid on the resistor 35 and the conductor 36 to adjust the resistance value.
[0003]
[Problems to be solved by the invention]
In the conventional rotary electric component, the cylindrical portion 32 is provided on the shaft 30 so that the entire circumference of the cylindrical portion 32 is widened. In addition to being weakened, this cracked part was in contact with the insulating substrate 34 during rotation, which deteriorated the rotation of the shaft 30.
Further, the expanded cylindrical portion 32 has a problem that a stress that tries to return to the original work is exerted on the entire periphery, and the mounting strength of the shaft 30 to the insulating substrate 34 is weak, and this problem is caused particularly in a high temperature environment. It is remarkable.
The cylindrical portion 32 is for attaching the shaft 30 to the insulating substrate 34, and when a click mechanism for adding moderation to the shaft 30 is added, the click mechanism is provided on the front surface portion of the shaft 30. There is a problem that the structure is complicated and large.
[0004]
[Means for Solving the Problems]
As resolving means for solving the above problems, a substrate having an uneven portion on the back surface of the hole and the bottom wall to the bottom wall, and a cylindrical portion and a flange portion having a split portion to the end without an internal cavity A rotatable shaft made of a synthetic resin, a hole through which the cylindrical portion is inserted, a bent portion positioned in the hole, and a leaf spring provided with a convex portion that engages with the concave and convex portion, and a surface of the base body And one of the flanges is provided with a slider, and the other is provided with a contact with which the slider is slidable or an electric element such as a resistor, and the leaf spring has a ring shape. An annular groove is provided to form an outer ring portion and an inner ring portion, the outer ring portion is provided with the convex portion, and the inner ring portion has the bent portion extending in the axial direction of the shaft. provided, said plate said bent portion is fitted in the spring to the split portion of the shaft that is inserted through the hole of the bottom wall, front To expand the distal end of the cylindrical portion and fixed to the plate spring in the cylindrical portion, by positioning the bottom wall between the plate spring and the flange portion, it is attached to the plate spring and the shaft to the base, the plate spring engages in the split portion for positioning the bent portion of the plate spring into the hole of the base body has a structure which holds and rotationally fixed relative to said axis.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a rotating electrical component according to the present invention will be described with reference to FIGS.
FIG. 1 to FIG. 6 show a pulse switch which is one of rotary electric components. A base body 1 made of a synthetic resin molded product has a bottom wall 1b having a circular hole 1a and a recess 1c. It has the side wall 1d which has, and the uneven | corrugated | grooved part 1e provided in the circumference | surroundings of the hole 1a in the back surface of the said bottom wall 1b.
In addition, a plurality of conductive plates 2 made of a thin metal plate are embedded in the base 1 so that a part is exposed on the upper surface of the bottom wall 1b and a part protrudes to the outside from the side wall 1d.
The portion exposed on the upper surface of the bottom wall 1b is a contact 2a, and the portion protruding from the side wall 1d is a terminal portion 2b whose end is bent into a square shape.
[0006]
Further, as shown in FIGS. 4 to 6, the conductive plate 2 is formed by punching a thin metal plate made of a hoop material to form a contact 2a and a terminal portion 2b. In FIG. 4, a base portion K1 forming a terminal portion 2b is formed. 5 are formed by bending both side portions K2, K3 of the base K1 on the same surface side so as to overlap the base K1.
Thereby, the strength of the terminal portion 2b is increased, and the insertion into the hole (not shown) of the printed board and the snap fastening are ensured.
In such a state, the conductive plate 2 is embedded in the base 1 of the synthetic resin so that the contact 2a is exposed on the bottom wall 1b and the base portion of the terminal portion 2b is located in the base 1. The base 1 is formed by making a member as shown in FIG. 6 and cutting the connecting portion R from the base 1.
Thus, the strength of the terminal portion 2b can be further increased by embedding the base portion of the terminal portion 2b in the base 1.
[0007]
The shaft 3 made of synthetic resin and having a hollow inside includes a circular flange portion 3a, a cylindrical portion 3c having a pair of split portions 3b at the tip, and a protrusion 3d provided in the flange portion 3a. The slider 4 made of a metal plate has a contact piece 4a formed by cutting and raising, and a hole 4b. The slider 4 has the protrusion 3d of the shaft 3 in the hole 4b. The tip of the protrusion 3d is crimped by being inserted and attached to the shaft 3.
The shaft 3 has the cylindrical portion 3c inserted through the hole 1a of the base body 1 with the slider 4 opposed to the contact 2a on the bottom wall 1b and the flange portion 3a positioned in the concave portion 1c. .
[0008]
The ring-shaped leaf spring 5 made of a metal plate, plastic, or the like is provided with an annular groove 5a to form an outer ring portion 5b and an inner ring portion 5c, and the outer ring portion 5b is provided with a convex portion 5d. At the same time, the inner ring portion 5c is provided with a pair of bent portions 5e in the direction of the shaft 3 so as to be positioned in the holes 5f.
The leaf spring 5 has the bent portion 5e positioned at the split portion 3b of the shaft 3 and is prevented from rotating in the rotational direction. The tube portion 3c of the shaft 3 is inserted into the hole 5f, and the tube portion 3c is inserted. The end of the inner ring 5 is spread outward with a heated jig (not shown), and the widened portion is locked to one surface of the inner ring portion 5 c, and the other surface of the inner ring portion 5 c contacts the back surface of the base 1. In contact with each other, the leaf spring 5 and the shaft 3 are attached to the base 1.
[0009]
When attached, as shown in FIG. 1, the contact piece 4 a of the slider 4 contacts the contact 2 a of the conductive plate 2, and the convex portion 5 d of the leaf spring 5 is on the back surface of the base 1. A click portion is formed in contact with the provided uneven portion 1e.
Such a rotary electric component is attached by snapping a square-shaped terminal portion 2b onto a printed circuit board (not shown) and soldering the end portion to a wiring pattern.
When the shaft 3 is rotated, the slider 4 slides on the contact 2a of the conductive plate 2 to obtain a desired pulse signal, and the leaf spring 5 rotates with the shaft 3 while being in sliding contact with the back surface of the base 1, The convex portion 5d is in sliding contact with the concave-convex portion 1e, and the shaft 3 is clicked.
[0010]
In the above-described embodiment, the slider is described as being in sliding contact with the contact point. However, it is sufficient if the slider is in sliding contact with an electrical element such as a contact or a resistor, and a click portion is provided. Although described with a thing, the thing without a click part may be sufficient.
[0011]
【The invention's effect】
According to the rotating electrical component of the present invention, in the structure in which the end of the cylindrical portion of the shaft made of synthetic resin is fixed to the base, a split portion is provided at the tip of the cylindrical portion, Since a click leaf spring is sandwiched between the base and the base, there is no cracking in the caulking part , and the caulking part cracks with the base or the strength of the caulking part is accompanied by the crack. Can be prevented , and the leaf spring comes into contact with the back surface of the substrate, so that the shaft rotates smoothly and the shaft can be smoothly rotated.
In addition, since the shaft is held by the base via the leaf spring, even if a stress occurs that the expanded cylindrical portion tries to return to the original in a high-temperature environment , the leaf spring eliminates loosening due to this return. It is possible to prevent the mounting strength from becoming weak.
In addition, the leaf spring is provided with a click convex portion and a bent portion that becomes a locking portion for rotating together with the shaft, so that the positioning of the leaf spring is performed by the split portion of the shaft located in the hole of the base. The leaf spring provided with the shaft and the convex portion for clicking can be held in a compact and reliable manner so as to be able to rotate together with the shaft.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rotating electrical component of the present invention.
FIG. 2 is an exploded perspective view of the rotating electrical component of the present invention.
FIG. 3 is a perspective view of a main part of a shaft according to the rotary electrical component of the present invention.
FIG. 4 is an explanatory view showing a method of forming a terminal portion in the rotary electric component of the present invention.
FIG. 5 is an explanatory view showing a method of forming a terminal portion in the rotary electric component of the present invention.
FIG. 6 is an explanatory view showing a method of forming a terminal portion in the rotary electric component of the present invention.
FIG. 7 is a cross-sectional view of a conventional rotating electrical component.
FIG. 8 is a perspective view of a conventional rotating electrical component.
FIG. 9 is a perspective view of a shaft of a conventional rotary electric component.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base | substrate 1a Hole 1b Bottom wall 1c Recessed part 1d Side wall 1e Uneven part 2 Conductive plate 2a Contact 2b Terminal part 3 Shaft 3a Eaves part 3b Split part 3c Tube part 3d Projection 4 Slider 4a Contact piece 4b Hole 5 Leaf spring 5a Groove 5b Outer ring part 5c Inner ring part 5d Convex part 5e Bending part 5f Hole
