JP4521715B2 - Waterproof pushbutton switch device - Google Patents

Waterproof pushbutton switch device Download PDF

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JP4521715B2
JP4521715B2 JP2004195143A JP2004195143A JP4521715B2 JP 4521715 B2 JP4521715 B2 JP 4521715B2 JP 2004195143 A JP2004195143 A JP 2004195143A JP 2004195143 A JP2004195143 A JP 2004195143A JP 4521715 B2 JP4521715 B2 JP 4521715B2
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elastic member
housing
push button
hole
shaft
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JP2006019112A (en
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高志 井上
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カシオマイクロニクス株式会社
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この発明は防水型押ボタンスイッチ装置に関する。   The present invention relates to a waterproof pushbutton switch device.

従来の防水型押ボタンスイッチ装置には、基本的には、筐体にその外側から内側に向かって大径、中径、小径の3段構造の貫通孔を形成し、大径の貫通孔内に押ボタンの一部を配置して、押ボタンの軸を小径の貫通孔に移動可能に挿通させ、押ボタンの軸の先端部に抜け止め用のリングを取り付け、中径の貫通孔内に筒状の弾性部材の一端部を配置し、筒状の弾性部材の他端部を押ボタンに設けられた収納部内に収納させたものがある(例えば、特許文献1参照)。   In a conventional waterproof pushbutton switch device, basically a three-stage through-hole of large diameter, medium diameter and small diameter is formed in the casing from the outside to the inside, and the inside of the large-diameter through-hole A part of the push button is placed on the push button, the push button shaft is movably inserted into the small diameter through hole, a retaining ring is attached to the end of the push button shaft, and the push hole is inserted into the medium diameter through hole. There is one in which one end portion of a cylindrical elastic member is arranged and the other end portion of the cylindrical elastic member is stored in a storage portion provided in a push button (for example, see Patent Document 1).

特開2002−352662号公報(図3〜図7)Japanese Patent Laid-Open No. 2002-352626 (FIGS. 3 to 7)

この場合、弾性部材は、筐体の貫通孔を防水構造とし且つ押ボタンを初期位置に復帰させるためのものである。そして、特許文献1の図3〜図5に記載の弾性部材では、肉圧の不均一なほぼ円筒形状であって、一端部内面に突出部を有し、他端部外面に鍔部を有する構造であり、初期の状態では、押ボタンの軸の一部との間に隙間が形成されている。特許文献1の図6に記載の弾性部材では、肉厚の不均一なほぼ円筒形状であって、軸方向中央部内面に突出部を有する構造であり、初期の状態では、押ボタンの軸の一部との間に隙間が形成されている。特許文献1の図7に記載の弾性部材では、肉厚がほぼ一定で、断面ほぼハ字状とされた構造であり、初期の状態では、押ボタンの軸の一部との間に隙間が形成されている。   In this case, the elastic member is for making the through hole of the housing waterproof and returning the push button to the initial position. And in the elastic member of FIGS. 3-5 of patent document 1, it is a substantially cylindrical shape with non-uniform | heterogenous pressure, Comprising: It has a protrusion part in the one end part inner surface, and has a collar part in the other end part outer surface. In the initial state, a gap is formed between a part of the push button shaft. The elastic member shown in FIG. 6 of Patent Document 1 has a substantially cylindrical shape with a non-uniform thickness and a structure having a protrusion on the inner surface in the axial direction center. A gap is formed between a part. The elastic member shown in FIG. 7 of Patent Document 1 has a structure in which the wall thickness is substantially constant and the cross section is substantially C-shaped. In the initial state, there is a gap between a part of the shaft of the push button. Is formed.

ところで、特許文献1に記載の防水型押ボタンスイッチ装置では、基本的には、筐体にその外側から内側に向かって大径、中径、小径の3段構造の貫通孔を形成しなければならないため、筐体の厚さが厚くなる上、筐体を金属によって形成する場合には、貫通孔の加工が面倒であり、樹脂によって形成する場合には、その金型の形状が複雑になるという問題があった。   By the way, in the waterproof pushbutton switch device described in Patent Document 1, basically, a through-hole having a three-stage structure having a large diameter, a medium diameter, and a small diameter is not formed in the casing from the outside to the inside. Therefore, when the casing is made of metal, the processing of the through hole is troublesome, and when it is made of resin, the shape of the mold becomes complicated. There was a problem.

また、特許文献1に記載の防水型押ボタンスイッチ装置では、筒状の弾性部材の形状が複雑でコスト高となり、しかも基本的には、筒状の弾性部材の一端部を中径の貫通孔内に配置し、他端部を押ボタンに設けられた収納部内に収納させ、押ボタンの一部を大径の貫通孔内に配置するため、弾性部材の最終的な組み込み状態を視認することができず、弾性部材の組み込み作業が面倒であるという問題があった。   Moreover, in the waterproof pushbutton switch device described in Patent Document 1, the shape of the cylindrical elastic member is complicated and expensive, and basically, one end of the cylindrical elastic member is connected to the medium-diameter through hole. It is placed inside, the other end is housed in the housing provided in the push button, and a part of the push button is placed in the large-diameter through hole, so that the final assembled state of the elastic member can be visually confirmed. There is a problem that the work of assembling the elastic member is troublesome.

また、特許文献1に記載の防水型押ボタンスイッチ装置では、大径の貫通孔内に押ボタンの一部を配置するため、大径の貫通孔の内壁面と押ボタンとの間の隙間を介して海水等の水分、塵埃や砂等の異物が侵入した場合、この侵入した水分や異物が自然に排出されにくくそのまま残存し、弾性部材の劣化の原因となるため、入念な水洗いが必要になるという問題があった。   Moreover, in the waterproof pushbutton switch device described in Patent Document 1, since a part of the pushbutton is disposed in the large-diameter through hole, a gap between the inner wall surface of the large-diameter through-hole and the pushbutton is provided. If water such as seawater or foreign matter such as dust or sand enters through it, the intruded moisture or foreign matter remains difficult to be discharged naturally and may cause deterioration of the elastic member. There was a problem of becoming.

さらに、特許文献1に記載の防水型押ボタンスイッチ装置では、初期の状態で、筒状の弾性部材と押ボタンの軸の一部との間に隙間が形成されているため、水圧が比較的高い水中で使用するとき、弾性部材が押し潰されて押ボタンの軸に密着され、押ボタンを押圧操作することができなくなってしまうという問題があった。   Furthermore, in the waterproof pushbutton switch device described in Patent Document 1, since a gap is formed between the cylindrical elastic member and a part of the pushbutton shaft in the initial state, the water pressure is relatively low. When used in high water, there is a problem that the elastic member is crushed and brought into close contact with the shaft of the push button, making it impossible to press the push button.

そこで、この発明は、筐体の厚さを可及的に薄くすることができ、また筒状の弾性部材の形状が簡単でコストを低減することができ、また筒状の弾性部材の組み込み作業を容易に行なうことができ、また筐体の貫通孔内に水分や異物が侵入しないようにすることができ、さらに水圧が比較的高い水中で使用しても押ボタンを押圧操作することができる防水型押ボタンスイッチ装置を提供することを目的とする。   Therefore, the present invention can reduce the thickness of the casing as much as possible, can simplify the shape of the cylindrical elastic member, reduce the cost, and incorporate the cylindrical elastic member. Can be easily performed, moisture and foreign matter can be prevented from entering the through-hole of the housing, and the push button can be pressed even when used in water with relatively high water pressure. An object of the present invention is to provide a waterproof pushbutton switch device.

この発明は、上記目的を達成するため、筐体と、前記筐体の表裏を同一径で貫通する第一の貫通孔と、前記筐体の外側に配置され、前記筐体の貫通孔に移動可能に挿通された軸を有する押ボタンと、前記押ボタンと前記筐体との間に圧縮されて設けられた弾性部材と、を備え、前記弾性部材は、筒状の形状を有し、且つ、その外径が一端側から他端側にかけて略同一または一端側から他端側にかけて徐々に小さくなるとともに、その一端側から他端側にかけて両端間を貫通する第二の貫通孔を有し、該第二の貫通孔に前記押ボタンの軸を圧入して移動可能に挿通したものであり、且つ、前記弾性部材の下部の硬度は上部の硬度よりも低くなっていることを特徴とするものである。
In order to achieve the above object, the present invention is arranged on the outer side of the casing, the first through hole penetrating the front and back of the casing with the same diameter, and moved to the through hole of the casing. A push button having a shaft that is inserted therethrough, and an elastic member that is compressed between the push button and the housing, and the elastic member has a cylindrical shape, and The outer diameter is substantially the same from one end side to the other end side or gradually decreases from one end side to the other end side, and has a second through hole penetrating between both ends from the one end side to the other end side, The push button shaft is press-fitted into the second through hole so as to be movable , and the hardness of the lower portion of the elastic member is lower than the hardness of the upper portion. It is.

この発明によれば、押ボタンおよび筒状の弾性部材は筐体の外側に配置され、筐体に押ボタンの軸が移動可能に挿通される貫通孔を形成すればよいので、筐体の厚さを可及的に薄くすることができる。また、筒状の弾性部材は押ボタンの軸が圧入されて移動可能に挿通される貫通孔を有すればよいので、筒状の弾性部材の形状が簡単でコストを低減することができる。また、筒状の弾性部材を筐体の貫通孔内ではなく筐体の外側に配置すればよいので、筒状の弾性部材の組み込み作業を容易に行なうことができる。また、筐体の外側に配置された弾性部材で筐体の貫通孔を防水構造とすることができるので、筐体の貫通孔内に水分や異物が侵入しないようにすることができる。さらに、筒状の弾性部材の貫通孔に押ボタンの軸を圧入させて移動可能に挿通させているため、水圧が比較的高い水中で使用しても、弾性部材が変形しにくく初期の形状を維持し、したがって押ボタンを陸上とほぼ同様に押圧操作することができる。   According to the present invention, the push button and the cylindrical elastic member are disposed on the outside of the casing, and the through hole through which the shaft of the push button is movably inserted may be formed in the casing. The thickness can be made as thin as possible. Further, since the cylindrical elastic member only needs to have a through hole into which the shaft of the push button is press-fitted and movably inserted, the shape of the cylindrical elastic member is simple and the cost can be reduced. Further, since the cylindrical elastic member may be disposed outside the housing instead of in the through hole of the housing, the assembling work of the cylindrical elastic member can be easily performed. Moreover, since the through-hole of the housing can be made waterproof with an elastic member arranged outside the housing, moisture and foreign matter can be prevented from entering the through-hole of the housing. Furthermore, since the shaft of the push button is press-fitted into the through hole of the cylindrical elastic member so as to be movable, the elastic member is not easily deformed even when used in water with a relatively high water pressure. So that the push button can be pressed in much the same way as on land.

(第1実施形態)
図1はこの発明の第1実施形態としての防水型押ボタンスイッチ装置の断面図を示す。この防水型押ボタンスイッチ装置は、一例として、デジタルカメラ(図示せず)を覆うステンレス鋼等の金属やポリプロピレン等の樹脂からなる防水ケース(筐体1)に組み込まれて、シャッターボタン等として機能する部分を構成するものであり、軸4を有する押ボタン3、筒状の弾性部材5、回路基板11上に設けられたスイッチ12等を備えている。
(First embodiment)
FIG. 1 is a sectional view of a waterproof pushbutton switch device as a first embodiment of the present invention. As an example, this waterproof pushbutton switch device is incorporated in a waterproof case (housing 1) made of a metal such as stainless steel or a resin such as polypropylene that covers a digital camera (not shown), and functions as a shutter button or the like. A push button 3 having a shaft 4, a cylindrical elastic member 5, a switch 12 provided on a circuit board 11, and the like are provided.

このうち、筐体1には同一径の貫通孔2が設けられている。押ボタン3は円板形状であって、その下面中央部には円柱形状の軸4が形成されている。軸4を含む押ボタン3はステンレス鋼等の金属やポリプロピレン等の樹脂によって形成されている。ここで、筐体1の貫通孔2の直径は押ボタン3の軸4の直径よりもやや大きくなっている。   Among these, the casing 1 is provided with a through hole 2 having the same diameter. The push button 3 has a disc shape, and a cylindrical shaft 4 is formed at the center of the lower surface thereof. The push button 3 including the shaft 4 is formed of a metal such as stainless steel or a resin such as polypropylene. Here, the diameter of the through hole 2 of the housing 1 is slightly larger than the diameter of the shaft 4 of the push button 3.

筒状の弾性部材5は、シリコーンゴム等の弾性材料によって、当初、押ボタン3のサイズよりもある程度小さいサイズの円筒形状に形成されている。この場合、弾性部材5の中心部に形成された貫通孔6の当初の直径は、押ボタン3の軸4の直径よりもある程度小さくなっており、一例として、押ボタン3の軸4の直径の約1/2となっている。   The cylindrical elastic member 5 is initially formed in a cylindrical shape having a size somewhat smaller than the size of the push button 3 by an elastic material such as silicone rubber. In this case, the initial diameter of the through-hole 6 formed in the central portion of the elastic member 5 is somewhat smaller than the diameter of the shaft 4 of the push button 3. As an example, the diameter of the shaft 4 of the push button 3 It is about 1/2.

そして、押ボタン3の軸4は、弾性部材5の貫通孔6に圧入されて上下動可能に挿通され、さらに、筐体1の貫通孔2に上下動可能に挿通されている。筐体1内に配置された軸4の先端部には溝7が設けられており、この溝7には抜け止め用のEリング8が取り付けられている。   The shaft 4 of the push button 3 is press-fitted into the through hole 6 of the elastic member 5 and inserted through the through hole 2 of the housing 1 so as to move up and down. A groove 7 is provided at the tip of the shaft 4 disposed in the housing 1, and an E-ring 8 for preventing the removal is attached to the groove 7.

そして、図1に示す初期の状態では、当初円筒形状である弾性部材5は、上下方向から加圧されてある程度圧縮され、外形が周囲方向にある程度膨らんだ状態となっている。したがって、この状態では、弾性部材5は、筐体1の上面、押ボタン3の下面、筐体1と押ボタン3との間に存在する軸4の外周面に圧接され、これにより、筐体1の貫通孔2は防水構造とされている。   In the initial state shown in FIG. 1, the elastic member 5 having an initially cylindrical shape is compressed from the vertical direction to some extent and the outer shape is inflated to some extent in the peripheral direction. Therefore, in this state, the elastic member 5 is pressed against the upper surface of the housing 1, the lower surface of the push button 3, and the outer peripheral surface of the shaft 4 existing between the housing 1 and the push button 3. 1 through-hole 2 has a waterproof structure.

また、押ボタン3は、その軸4と共に、上下方向からある程度圧縮された弾性部材5の弾性復帰力により上方に付勢されているが、Eリング8が筐体1の内面に当接されていることにより、上限位置すなわち初期位置に位置決めされている。   The push button 3 is urged upward together with the shaft 4 by the elastic restoring force of the elastic member 5 compressed to some extent from the vertical direction, but the E-ring 8 is brought into contact with the inner surface of the housing 1. Thus, the upper limit position, that is, the initial position is set.

回路基板11上に設けられたスイッチ12は、筐体1内において押ボタン3の軸4の先端部と対向する位置に配置されている。このスイッチ12は、回路基板11上に設けられたケース13を備えている。ケース13の上板中央部には開口部14が設けられている。ケース13内に上下動可能に配置されたキートップ15の頭部は、開口部14を介してケース13の上方に突出されている。キートップ15の下方には、ドーム状の可動接点16、可動接点16の外周部下に電気的に接続されて配置された外部固定接点17、可動接点16の中心部下に配置された内部固定接点18が設けられている。   The switch 12 provided on the circuit board 11 is disposed in the housing 1 at a position facing the tip of the shaft 4 of the push button 3. The switch 12 includes a case 13 provided on the circuit board 11. An opening 14 is provided at the center of the upper plate of the case 13. The head of the key top 15 disposed in the case 13 so as to be movable up and down protrudes above the case 13 through the opening 14. Below the key top 15, a dome-shaped movable contact 16, an external fixed contact 17 arranged to be electrically connected below the outer peripheral portion of the movable contact 16, and an internal fixed contact 18 arranged below the center of the movable contact 16. Is provided.

そして、この防水型押ボタンスイッチ装置では、押ボタン3が押圧されると、軸4が下降し、それに伴い、弾性部材5が適宜に圧縮される。下降する軸4がキートツプ15を介して可動接点16の中心部を押圧し、この押圧された可動接点16の中心部が弾性変形して内部固定接点18に接触し、これにより、内部固定接点18と外部固定接点17との間が可動接点16を介して導通し、オン状態となる。   And in this waterproof type pushbutton switch apparatus, if the pushbutton 3 is pressed, the axis | shaft 4 will descend | fall and the elastic member 5 will be compressed suitably accordingly. The descending shaft 4 presses the central portion of the movable contact 16 via the key top 15, and the central portion of the pressed movable contact 16 is elastically deformed and comes into contact with the internal fixed contact 18. And the external fixed contact 17 are brought into conduction through the movable contact 16 and are turned on.

一方、押ボタン3に対する押圧力が解除されると、弾性部材5がそれ自体の弾性力により初期の状態に復帰し、これに伴い、押ボタン3が軸4と共に上昇して初期位置に復帰する。また、可動接点16がそれ自体の弾性力により初期の状態に復帰し、これに伴い、キートツプ15が上昇して初期位置に復帰し、また、可動接点16が内部固定接点18から離間し、オフ状態となる。   On the other hand, when the pressing force on the push button 3 is released, the elastic member 5 returns to the initial state by its own elastic force, and accordingly, the push button 3 rises together with the shaft 4 to return to the initial position. . In addition, the movable contact 16 returns to its initial state by its own elastic force, and accordingly, the key top 15 rises and returns to the initial position, and the movable contact 16 is separated from the internal fixed contact 18 and turned off. It becomes a state.

以上のように、この防水型押ボタンスイッチ装置では、押ボタン3および筒状の弾性部材5を筐体1の外側に配置し、筐体1に押ボタン3の軸4が移動可能に挿通される貫通孔2を形成すればよいので、筐体1に押ボタン3の軸4の直径よりもやや大きめの同一径の貫通孔2を形成すればよく、筐体1の厚さを可及的に薄くすることができる。この結果、筐体1をステンレス鋼等の金属によって形成する場合には、同一径の貫通孔2を比較的容易に形成することができ、ポリプロピレン等の樹脂によって形成する場合には、その金型の形状を簡単とすることができる。   As described above, in this waterproof pushbutton switch device, the pushbutton 3 and the cylindrical elastic member 5 are disposed outside the housing 1, and the shaft 4 of the pushbutton 3 is movably inserted into the housing 1. The through-hole 2 having the same diameter that is slightly larger than the diameter of the shaft 4 of the push button 3 may be formed in the housing 1 so that the thickness of the housing 1 can be made as much as possible. Can be thinned. As a result, when the casing 1 is formed of a metal such as stainless steel, the through hole 2 having the same diameter can be formed relatively easily. When the casing 1 is formed of a resin such as polypropylene, the mold The shape can be simplified.

また、筒状の弾性部材4は押ボタン3の軸4が圧入されて移動可能に挿通される貫通孔6を有すればよいので、弾性部材4の当初の形状を単なる円筒形状とすることができ、したがって弾性部材4の形状が簡単でコストを低減することができる。また、筒状の弾性部材5を筐体1の貫通孔2内ではなく筐体1の外側に配置すればよいので、筒状の弾性部材5の組み込み作業を容易に行なうことができる。すなわち、押ボタン3の軸4を、弾性部材5の貫通孔6に圧入させて挿通させ、次いで、筐体1の貫通孔2に挿通させながら、弾性部材5を適宜に圧縮させ、次いで、筐体1内に配置された軸4の溝7にEリング8を取り付ければよく、筒状の弾性部材5の組み込み作業を容易に行なうことができる。   Moreover, since the cylindrical elastic member 4 should just have the through-hole 6 by which the axis | shaft 4 of the pushbutton 3 is press-fitted and movably penetrated, making the initial shape of the elastic member 4 into a mere cylindrical shape. Therefore, the shape of the elastic member 4 is simple and the cost can be reduced. Moreover, since the cylindrical elastic member 5 should just be arrange | positioned not in the through-hole 2 of the housing | casing 1 but on the housing | casing 1, the assembly operation | work of the cylindrical elastic member 5 can be performed easily. That is, the shaft 4 of the push button 3 is press-fitted into the through hole 6 of the elastic member 5 and then inserted, and then the elastic member 5 is appropriately compressed while being inserted through the through hole 2 of the housing 1. The E-ring 8 may be attached to the groove 7 of the shaft 4 disposed in the body 1, and the assembling work of the cylindrical elastic member 5 can be easily performed.

また、筐体1の外側に配置された弾性部材5で筐体1の貫通孔2を防水構造としているので、筐体1の貫通孔2内に水分や異物が侵入しないようにすることができる。換言すれば、弾性部材5を筐体1の外側に配置しているため、弾性部材5に水分や異物が付着しても、この付着した水分や異物を簡単に除去することができ、水分や異物の付着に起因する弾性部材5の劣化を防止することができる。   Moreover, since the through-hole 2 of the housing 1 has a waterproof structure by the elastic member 5 arranged outside the housing 1, moisture and foreign matter can be prevented from entering the through-hole 2 of the housing 1. . In other words, since the elastic member 5 is disposed outside the housing 1, even if moisture or foreign matter adheres to the elastic member 5, the attached moisture or foreign matter can be easily removed. It is possible to prevent the elastic member 5 from being deteriorated due to the adhesion of foreign matter.

また、筒状の弾性部材5の貫通孔6に押ボタン3の軸4を圧入させて移動可能に挿通させているため、水圧が比較的高い水中で使用しても、筒状の弾性部材5が変形しにくく初期の形状を維持し、したがって押ボタン3を陸上とほぼ同様に押圧操作することができる。   Further, since the shaft 4 of the push button 3 is press-fitted into the through-hole 6 of the cylindrical elastic member 5 so as to be movable, the cylindrical elastic member 5 is used even when used in water with a relatively high water pressure. However, it is difficult to deform, and the initial shape can be maintained. Therefore, the push button 3 can be pressed almost in the same manner as on land.

また、適宜に圧縮された弾性部材5の貫通孔6に押ボタン3の軸4を圧入しているため、弾性部材5が軸4の支えとなり、軸4の横方向からの荷重に対する抵抗力が増大し、押ボタン3に横方向からある程度の過荷重がかかっても、軸4がその支点の部分(筐体1の貫通孔2に挿通された部分)で折れにくいようにすることができる。   Further, since the shaft 4 of the push button 3 is press-fitted into the appropriately compressed through hole 6 of the elastic member 5, the elastic member 5 serves as a support for the shaft 4, and the resistance force against the load from the lateral direction of the shaft 4 is increased. Even if a certain amount of overload is applied to the push button 3 from the lateral direction, the shaft 4 can be prevented from being broken at the fulcrum portion (the portion inserted through the through hole 2 of the housing 1).

さらに、弾性部材5を自己潤滑性を有するシリコーンゴムによって形成すると、弾性部材5と軸4との間の摩擦抵抗が軽減し、押ボタン3の押圧操作をスムーズとすることができる。また、軸4を含む押ボタン3を自己潤滑性を有するポリプロピレンによって形成すると、弾性部材5と軸4との間の摩擦抵抗がより一層軽減し、押ボタン3の押圧操作をより一層スムーズとすることができる。   Further, when the elastic member 5 is formed of self-lubricating silicone rubber, the frictional resistance between the elastic member 5 and the shaft 4 is reduced, and the pressing operation of the push button 3 can be made smooth. Further, when the push button 3 including the shaft 4 is made of self-lubricating polypropylene, the frictional resistance between the elastic member 5 and the shaft 4 is further reduced, and the push operation of the push button 3 is further smoothed. be able to.

(第2実施形態)
図2はこの発明の第2実施形態としての防水型押ボタンスイッチ装置の要部の断面図を示す。この防水型押ボタンスイッチ装置において、図1に示す場合と異なる点は、弾性部材5を2色成形により下部弾性層5aと上部弾性層5bとからなる2層構造とし、下部弾性層5aを上部弾性層5bよりも硬度の低い弾性材料によって形成した点である。一例として、下部弾性層5aは硬度10〜30Hsのシリコーンゴムによって形成され、上部弾性層5bは硬度40〜60Hsのシリコーンゴムによって形成されている。
(Second Embodiment)
FIG. 2 shows a cross-sectional view of a main part of a waterproof pushbutton switch device as a second embodiment of the present invention. In this waterproof pushbutton switch device, the difference from the case shown in FIG. 1 is that the elastic member 5 is formed in a two-layer structure composed of a lower elastic layer 5a and an upper elastic layer 5b by two-color molding, This is a point formed by an elastic material having a lower hardness than the elastic layer 5b. As an example, the lower elastic layer 5a is formed of silicone rubber having a hardness of 10 to 30 Hs, and the upper elastic layer 5b is formed of silicone rubber having a hardness of 40 to 60 Hs.

この場合、下部弾性層5aおよび上部弾性層5bの当初の形状は円筒形状となっている。また、この当初の形状における下部弾性層5aの厚さは、後述する機能を発揮すればよく、あまり厚くする必要はなく、一例として、上部弾性層5bの厚さの約1/3となっている。そして、図2に示す初期の状態では、上下方向からある程度加圧されることにより、低硬度の下部弾性層5aのみがほぼ最大限に圧縮され、高硬度の上部弾性層5bはほとんど圧縮されず当初の形状を維持している。   In this case, the initial shapes of the lower elastic layer 5a and the upper elastic layer 5b are cylindrical. In addition, the thickness of the lower elastic layer 5a in this initial shape only needs to exhibit the function described later, and does not need to be too thick. For example, the thickness is about 1/3 of the thickness of the upper elastic layer 5b. Yes. In the initial state shown in FIG. 2, by applying a certain amount of pressure from above and below, only the lower elastic lower elastic layer 5 a is compressed to the maximum extent, and the upper hard elastic layer 5 b is hardly compressed. The original shape is maintained.

この防水型押ボタンスイッチ装置を組み立てる場合には、押ボタン3の軸4を、弾性部材5の貫通孔6に圧入させて挿通させ、次いで、筐体1の貫通孔2に挿通させながら、低硬度の下部弾性層5aをほぼ最大限に圧縮させ、且つ、高硬度の上部弾性層5bをやや圧縮させ、次いで、筐体1内に配置された軸4の溝7にEリング8を取り付ける。   When assembling this waterproof pushbutton switch device, the shaft 4 of the pushbutton 3 is press-fitted into the through hole 6 of the elastic member 5 and then inserted into the through hole 2 of the housing 1. The lower elastic layer 5a having hardness is compressed to the maximum extent and the upper elastic layer 5b having high hardness is slightly compressed, and then the E-ring 8 is attached to the groove 7 of the shaft 4 disposed in the housing 1.

この場合、低硬度の下部弾性層5aは高硬度の上部弾性層5bよりも変形しやすく、また下部弾性層5aの硬度が低いので、下部弾性層5aと軸4との間の摩擦抵抗が軽減し、弾性部材5の組み込み作業をより一層容易に行なうことができる。また、組み立てた状態では、低硬度の下部弾性層5aがほぼ最大限に圧縮されているため、下部弾性層5aがそれ自体の弾性力により初期の状態に復帰しようとする力が大きく、下部弾性層5aの筐体1の外面に対する密着性が向上し、ひいては防水効果を向上することができる。   In this case, the lower elastic lower elastic layer 5a is more easily deformed than the upper hard upper elastic layer 5b, and the lower elastic layer 5a has a lower hardness, so that the frictional resistance between the lower elastic layer 5a and the shaft 4 is reduced. In addition, the work of assembling the elastic member 5 can be performed more easily. Further, in the assembled state, the lower elastic lower elastic layer 5a is almost maximally compressed, so that the lower elastic layer 5a has a large force to return to the initial state by its own elastic force, and the lower elastic layer The adhesion of the layer 5a to the outer surface of the housing 1 is improved, and as a result, the waterproof effect can be improved.

この防水型押ボタンスイッチ装置で押ボタン3が押圧された場合には、図3に示すように、低硬度の下部弾性層5aは当初からほぼ最大限に圧縮されているため、それ以上はほとんど圧縮されず、高硬度の上部弾性層5bのみが適宜に圧縮される。この場合、軸4と弾性部材5との間に摩擦が発生し、弾性部材5の変形量はその下部で大きくなる傾向にあるが、下部弾性層5aの硬度が低いので、下部弾性層5aと軸4との間の摩擦抵抗が軽減し、押ボタン3の押圧操作をより一層スムーズとすることができる。   When the pushbutton 3 is pressed by this waterproof pushbutton switch device, as shown in FIG. 3, the lower hardness lower elastic layer 5a is compressed almost as much as possible from the beginning, so that the rest is almost Only the high hardness upper elastic layer 5b is appropriately compressed without being compressed. In this case, friction is generated between the shaft 4 and the elastic member 5, and the deformation amount of the elastic member 5 tends to increase at the lower part thereof, but the lower elastic layer 5 a has low hardness, The frictional resistance with the shaft 4 is reduced, and the pressing operation of the push button 3 can be made even smoother.

ここで、図1に示す場合には、押ボタン3に対する押圧力が解除されると、軸4と弾性部材5との間の摩擦抵抗が比較的大きいため、その当初において、弾性部材5が適宜に圧縮された状態のまま浮き上がり、防水不良となることがある。これに対し、この第2実施形態では、押ボタン3に対する押圧力が解除されると、図3に示すように、高硬度の上部弾性層5bのみがそれ自体の弾性力により初期の状態に復帰するが、低硬度の下部弾性層5aと軸4との間の摩擦抵抗が軽減しているため、下部弾性層5aが浮き上がることがなく、したがって防水不良となることはない。   Here, in the case shown in FIG. 1, when the pressing force on the push button 3 is released, the frictional resistance between the shaft 4 and the elastic member 5 is relatively large. It may float in a compressed state, resulting in poor waterproofing. On the other hand, in the second embodiment, when the pressing force on the push button 3 is released, as shown in FIG. 3, only the hard upper elastic layer 5b is restored to its initial state by its own elastic force. However, since the frictional resistance between the lower elastic lower elastic layer 5a and the shaft 4 is reduced, the lower elastic layer 5a does not float up, and therefore does not have a waterproof failure.

(第3実施形態)
図4はこの発明の第3実施形態としての防水型押ボタンスイッチ装置の要部の断面図を示す。この防水型押ボタンスイッチ装置において、図2に示す場合と異なる点は、軸4を含む押ボタン3をポリプロピレン等の樹脂によって形成し、且つ、軸4の先端部に抜け止め用突起9を形成した点である。この場合、図2に示すEリング8が不要となるので、その分だけ部品点数が減少し、コストを低減することができる。
(Third embodiment)
FIG. 4 shows a cross-sectional view of a main part of a waterproof pushbutton switch device as a third embodiment of the present invention. In this waterproof pushbutton switch device, the difference from the case shown in FIG. 2 is that the pushbutton 3 including the shaft 4 is made of resin such as polypropylene, and the retaining projection 9 is formed at the tip of the shaft 4. This is the point. In this case, since the E-ring 8 shown in FIG. 2 is not necessary, the number of parts is reduced accordingly, and the cost can be reduced.

この防水型押ボタンスイッチ装置を組み立てる場合には、押ボタン3の抜け止め用突起9を含む軸4を、弾性部材5の貫通孔6に圧入させて挿通させ、次いで、筐体1の貫通孔2に圧入させて挿通させ、筐体1内に配置された抜け止め用突起9を筐体1の内面に当接させればよく、組み立て作業をより一層容易に行なうことができる。   When assembling this waterproof pushbutton switch device, the shaft 4 including the protrusion 9 for retaining the pushbutton 3 is press-fitted into the through hole 6 of the elastic member 5, and then the through hole of the housing 1 is inserted. It is only necessary to press-fitting into 2 and insert it, and the retaining projection 9 disposed in the housing 1 is brought into contact with the inner surface of the housing 1, so that the assembling work can be performed more easily.

(第4実施形態)
図5はこの発明の第4実施形態としての防水型押ボタンスイッチ装置の要部の断面図を示す。この防水型押ボタンスイッチ装置において、図2に示す場合と異なる点は、筐体1をポリプロピレン等の樹脂によって形成し、且つ、筐体1の外面に弾性部材5の下部弾性層5aに食い込むリング状の突起10を形成し、防水効果を向上させた点である。
(Fourth embodiment)
FIG. 5 shows a cross-sectional view of a main part of a waterproof pushbutton switch device as a fourth embodiment of the present invention. In this waterproof pushbutton switch device, the difference from the case shown in FIG. 2 is that the casing 1 is made of a resin such as polypropylene and the outer surface of the casing 1 bites into the lower elastic layer 5a of the elastic member 5 This is the point that the protrusion 10 is formed to improve the waterproof effect.

(第5実施形態)
図6はこの発明の第5実施形態としての防水型押ボタンスイッチ装置の要部の断面図を示す。この防水型押ボタンスイッチ装置において、図1に示す場合と異なる点は、弾性部材5の当初の外形形状を逆裁頭円錐形状とした点である。この場合も、組み立てた状態では、当初逆裁頭円錐形状である弾性部材5は、上下方向から加圧されてある程度圧縮され、外形が周囲方向にある程度膨らんだ状態となっている。
(Fifth embodiment)
FIG. 6 shows a cross-sectional view of the main part of a waterproof pushbutton switch device as a fifth embodiment of the present invention. In this waterproof pushbutton switch device, the difference from the case shown in FIG. 1 is that the initial outer shape of the elastic member 5 is a reverse truncated cone shape. In this case as well, in the assembled state, the elastic member 5 having an initially inverted truncated conical shape is pressurized from the vertical direction and compressed to some extent, and the outer shape is inflated to some extent in the circumferential direction.

この防水型押ボタンスイッチ装置では、弾性部材5の下部の段面積が上部の段面積よりも小さくなっているので、弾性部材5の下部が上部よりも変形しやすく、また弾性部材5の下部の軸4に対する締め付け力が上部よりも小さくなる。この結果、組み立てるとき、弾性部材5の下部が上部よりも大きく変形し、且つ、弾性部材5の下部と軸4との間の摩擦抵抗が軽減され、ひいては組立て作業をより一層容易に行なうことができる。   In this waterproof pushbutton switch device, the lower step area of the elastic member 5 is smaller than the upper step area, so that the lower portion of the elastic member 5 is more easily deformed than the upper portion, and the lower portion of the elastic member 5 The tightening force on the shaft 4 is smaller than the upper part. As a result, when assembling, the lower part of the elastic member 5 is deformed more than the upper part, the frictional resistance between the lower part of the elastic member 5 and the shaft 4 is reduced, and as a result, the assembling work can be performed more easily. it can.

また、この防水型押ボタンスイッチ装置で押ボタン3が押圧された場合には、弾性部材5の下部が上部よりも大きく変形し、且つ、弾性部材5の下部と軸4との間の摩擦抵抗が軽減され、ひいては押ボタン3の押圧操作をより一層スムーズとすることができる。また、押ボタン3に対する押圧力が解除された場合には、弾性部材5が浮き上がることがなく、したがって防水不良となることはない。   Further, when the push button 3 is pressed by the waterproof push button switch device, the lower portion of the elastic member 5 is deformed more than the upper portion, and the frictional resistance between the lower portion of the elastic member 5 and the shaft 4 is increased. Is reduced, and as a result, the pressing operation of the push button 3 can be made even smoother. In addition, when the pressing force on the push button 3 is released, the elastic member 5 does not float up and therefore does not cause a waterproof failure.

(その他の実施形態)
例えば、図2において、下部弾性層5aと上部弾性層5bとを別部品としてもよい。また、図6において、弾性部材5の当初の外形形状を、例えば図6に図示する如く、その断面積が押ボタン3側から筐体1側に向かうに従って漸次小さくなり、且つ、周囲方向にある程度膨らんだ形状としてもよい。
(Other embodiments)
For example, in FIG. 2, the lower elastic layer 5a and the upper elastic layer 5b may be separate parts. Further, in FIG. 6, the initial outer shape of the elastic member 5 is gradually reduced from the push button 3 side toward the housing 1 side as shown in FIG. It may be a bulging shape.

この発明の第1実施形態としての防水型押ボタンスイッチ装置の断面図。Sectional drawing of the waterproof pushbutton switch apparatus as 1st Embodiment of this invention. この発明の第2実施形態としての防水型押ボタンスイッチ装置の要部の断面図。Sectional drawing of the principal part of the waterproof type pushbutton switch apparatus as 2nd Embodiment of this invention. 図2に示す押ボタンが押圧操作された状態を説明するために示す断面図。Sectional drawing shown in order to demonstrate the state by which the pushbutton shown in FIG. 2 was pressed. この発明の第3実施形態としての防水型押ボタンスイッチ装置の要部の断面図。Sectional drawing of the principal part of the waterproof type pushbutton switch apparatus as 3rd Embodiment of this invention. この発明の第4実施形態としての防水型押ボタンスイッチ装置の要部の断面図。Sectional drawing of the principal part of the waterproof type pushbutton switch apparatus as 4th Embodiment of this invention. この発明の第5実施形態としての防水型押ボタンスイッチ装置の要部の断面図。Sectional drawing of the principal part of the waterproof type pushbutton switch apparatus as 5th Embodiment of this invention.

符号の説明Explanation of symbols

1 筐体
2 貫通孔
3 押ボタン
4 軸
5 弾性部材
6 貫通孔
8 Eリング
12 スイッチ
DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Through-hole 3 Push button 4 Axis 5 Elastic member 6 Through-hole 8 E ring 12 Switch

Claims (5)

筐体と、
前記筐体の表裏を同一径で貫通する第一の貫通孔と、
前記筐体の外側に配置され、前記筐体の貫通孔に移動可能に挿通された軸を有する押ボタンと、
前記押ボタンと前記筐体との間に圧縮されて設けられた弾性部材と、を備え、
前記弾性部材は、筒状の形状を有し、且つ、その外径が一端側から他端側にかけて略同一または一端側から他端側にかけて徐々に小さくなるとともに、その一端側から他端側にかけて両端間を貫通する第二の貫通孔を有し、該第二の貫通孔に前記押ボタンの軸を圧入して移動可能に挿通したものであり、且つ、前記弾性部材の下部の硬度は上部の硬度よりも低くなっている
ことを特徴とする防水型押ボタンスイッチ装置。
A housing,
A first through hole penetrating the front and back of the housing with the same diameter;
A push button having an axis disposed outside the housing and movably inserted into a through hole of the housing;
An elastic member provided by being compressed between the push button and the housing,
The elastic member has a cylindrical shape, and its outer diameter is substantially the same from one end side to the other end side, or gradually decreases from one end side to the other end side, and from one end side to the other end side. A second through-hole penetrating between both ends, the shaft of the push button being press-fitted into the second through-hole and movably inserted , and the hardness of the lower portion of the elastic member is the upper portion Waterproof push-button switch device characterized in that it is lower than the hardness .
請求項1に記載の発明において、前記弾性部材は、上部弾性部材と該上部弾性部材の硬度よりも低い硬度の下部弾性部材とからなることを特徴とする防水型押ボタンスイッチ装置。   The waterproof pushbutton switch device according to claim 1, wherein the elastic member includes an upper elastic member and a lower elastic member having a hardness lower than that of the upper elastic member. 請求項に記載の発明において、前記上部弾性部材および前記下部弾性部材の当初の形状は円筒形状であることを特徴とする防水型押ボタンスイッチ装置。 3. The waterproof pushbutton switch device according to claim 2 , wherein an initial shape of the upper elastic member and the lower elastic member is a cylindrical shape. 請求項1に記載の発明において、前記弾性部材の当初の外形形状は逆裁頭円錐形状であることを特徴とする防水型押ボタンスイッチ装置。   2. The waterproof pushbutton switch device according to claim 1, wherein an initial outer shape of the elastic member is a reverse truncated cone shape. 請求項1に記載の発明において、前記筐体の外面に前記弾性部材に食い込むリング状の突起が形成されていることを特徴とする防水型押ボタンスイッチ装置。   The waterproof pushbutton switch device according to claim 1, wherein a ring-shaped protrusion that bites into the elastic member is formed on an outer surface of the housing.
JP2004195143A 2004-07-01 2004-07-01 Waterproof pushbutton switch device Expired - Fee Related JP4521715B2 (en)

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