JP2010040212A - Member for push-button switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member for a push-button switch, equipped with a contact member which prevents sticking phenomenon and is easy to manufacture. <P>SOLUTION: The member 10 for a push-button switch includes: a pressing section 15 opposed to an electrode 13 provided on a base 11; an elastic support section 17 capable of supporting the pressing section 15 away from the base 11; and a contact member 20 disposed on the base 11 side of the pressing section 15. The contact member 20 makes direct contact with the electrode 13 as the pressing section 15 is pressed, and moves away from the electrode 13 when the pressing of the pressing section 15 is canceled. The contact member 20 includes in an area facing the electrode 13: projecting portions 23 each having a contact portion which makes contact with the electrode 13 when the pressing section 15 is pressed by a finger; and non-contact portions separated from the electrode 13 each between the projecting portions 23, the non-contact portions being formed on the side closer to the pressing section 15 than the contact portions. The contact member 20 is formed in a body with only a conductive rubber. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a member for a push button switch using a contact member made of conductive rubber.

  Conventionally, many pushbutton switch members as shown in FIG. 7A have been used. This push button switch member is a member for separating and contacting a plurality of electrodes 33 provided on the substrate 31 so as to be separated from each other. For example, the flat contact member 40 is disposed on the surface of the pressing portion 35 that is supported by the elastic support portion 37 made of an elastically deformable material so as to face the plurality of electrodes 33 on the substrate 31. Has been. As the contact member 40, one obtained by molding a conductive rubber such as silicone rubber containing a conductive filler or the like is used (for example, refer to the prior art in Patent Document 1 below).

  In such a pushbutton switch member, as shown in FIG. 7A, the pressing portion 35 is normally held at a position separated from the substrate 31, and the contact member 40 is separated from the substrate 31 and the electrode 33. is doing. Therefore, the plurality of electrodes 33 are disconnected, and the switch is in an off state.

  When the pressing portion 35 is pressed, the elastic support portion 37 is elastically deformed as shown in FIG. 8A, and the pressing portion 35 moves to the substrate 31 side. Therefore, as shown in FIG. 40 is in contact with the plurality of electrodes 33, whereby the plurality of electrodes 33 are connected, and the switch is turned on.

  Thereafter, when the pressing of the pressing portion 35 is released, the pressing portion 35 moves to the side away from the substrate 31 due to the restoring force of the elastic support portion 37, and the contact member 40 is separated from the plurality of electrodes 33 and between the electrodes 33. Is disconnected and the switch is turned off again.

  Some of such push button switch members 30 are always kept in contact with the plurality of electrodes 33 depending on the application, such as a left / right changeover switch of a vehicle door mirror.

  However, when the contact member 40 made of conductive rubber is kept in contact with the surface of the electrode 33 and the surrounding substrate 31 for a long time, the contact member 40 adheres to the surface of the electrode 33 and the surface of the substrate 31. In other words, a so-called sticking phenomenon occurs in which separation becomes impossible. When the sticking phenomenon occurs, even if the pressing force of the pressing portion 35 is released, the restoring force of the elastic support portion 37 prevents the pressing portion 35 from moving away from the substrate 31, and the switch is kept on. Switch operation is disabled.

Therefore, in the following Patent Document 1, a structure in which silicone rubber and a conductive material are laminated, a hard resin layer is formed on the surface of the silicone rubber layer, and a flexible metal that can be elastically deformed via an adhesive layer on the hard resin layer. By providing the foil layer, the contact member is configured to prevent the sticking phenomenon.
JP 2003-109449 A

  However, as in Patent Document 1, when a contact member that can prevent a sticking phenomenon is provided by providing a silicone rubber layer, a hard resin layer, an adhesive layer, and a metal foil layer, a large number of layers are laminated. There is a problem that it takes time and effort to manufacture.

  Accordingly, an object of the present invention is to provide a member for a push button switch provided with a contact member that can prevent a sticking phenomenon and is easy to manufacture.

  The inventors have deformed the contact member made of conductive rubber by being pressed against the electrode or the substrate, and the surface of the contact member is in close contact with the surface shape of the electrode or the substrate so that the suction cup is adsorbed. As a result, it has been found that the sticking phenomenon is more likely to occur, and the above-described problems have been solved.

  That is, the contact member according to claim 1, which solves the above-described problem, includes a pressing portion disposed to face an electrode provided on the substrate, an elastic support portion capable of supporting the pressing portion while being separated from the substrate, A contact member disposed on the substrate side of the pressing portion, and the contact member is in direct contact with the electrode when the pressing portion is pressed, and the pressing of the pressing portion is released. In the pushbutton switch member configured to be separated from the electrode, the contact member is formed of only conductive rubber, and the electrode is pressed when the pressing portion is pressed in a region facing the electrode. And a non-contact portion spaced apart from the electrode.

  In addition to the structure of Claim 1, the invention described in claim 2 is formed by projecting from the surface surrounding the periphery and having the contact portion, or being depressed from the surface surrounding the periphery. A concave portion having the non-contact portion is provided.

  The invention according to claim 3 is characterized in that, in addition to the configuration according to claim 2, the convex portion or the concave portion includes an angular edge.

  According to a fourth aspect of the invention, in addition to the configuration of the second or third aspect, the surface of the electrode and the substrate on the side of the pressing portion is a flat surface, and the surface of the convex portion or the concave portion is a curved surface or It is formed in the shape of a conical surface.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, the surface of the electrode is formed so as to protrude from the substrate, and between the contact portion and the non-contact portion. The height difference is greater than the height difference between the surface of the electrode and the surface of the substrate.

  According to the first or second aspect of the present invention, the contact member is made of only conductive rubber, and when the pressing portion is pressed by a finger, the contact portion that comes into contact with the electrode and the non-contacting portion that is separated from the electrode. Since the contact part is provided in the area facing the electrode, the contact member made of conductive rubber is not completely adhered to the entire surface of the electrode when the contact member is pressed against the electrode surface, and the suction cup is adsorbed. This is unlikely to occur. Therefore, it is possible to prevent sticking. And since the whole including a contact part and a non-contact part is formed only with conductive rubber, it can manufacture easily by shaping | molding etc.

  According to the invention described in claim 3, since the convex portion or the concave portion is provided with an angular edge portion, even if the contact member is pressed against the electrode and greatly elastically deformed, the edge portion or the vicinity thereof is in close contact with the electrode surface. It is difficult to prevent the entire contact region of the contact member facing the electrode from sticking to the electrode surface. Therefore, it is easy to prevent sticking more reliably.

  According to invention of Claim 4, since the surface of the pressing part side of an electrode and a board | substrate consists of a plane, and the surface of the convex part or recessed part of a contact member is formed in the curved surface or the cone shape, each convex part Or, in the concave portion, the distance between the electrode surface and the substrate surface and the urging force when elastically deformed can be varied depending on the position, and each convex portion is in close contact with the electrode surface or the substrate surface and is difficult to separate. It is easier to prevent becoming.

  According to the fifth aspect of the present invention, the surface of the electrode is formed so as to protrude from the substrate, and the height difference between the contact portion and the non-contact portion is the difference between the surface of the electrode and the surface of the substrate. Therefore, even when a part of the contact portion does not contact the electrode surface, it is easy to maintain the non-contact portion separated from the electrode surface, and the non-contact portion is separated from the electrode surface. Easy to energize. Therefore, sticking can be more easily prevented.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
Embodiment 1 of the Invention

  As shown in FIG. 1, the pushbutton switch member 10 is mounted in a state of being opposed to and spaced apart from the plurality of electrodes 13 provided on the substrate 11, and constitutes an operation unit of a switch of an electric device, an electronic device, or the like. Is.

  The substrate 11 is formed in a flat surface, and the electrode 13 is formed on the flat surface of the substrate 11 so as to protrude in a step shape, and is formed of a flat surface. This electrode 13 is connected to a circuit (not shown).

  The pushbutton switch member 10 includes a pressing portion 15 and an elastic support portion 17 that supports the pressing portion 15 so that the pressing portion 15 can be pressed, and the pressing portion 15 is disposed at a position facing the plurality of electrodes 13 on the substrate 11. Has been. A contact member 20 is mounted at a position facing the electrode 13 on the substrate side of the pressing portion 15.

  The pressing unit 15 and the elastic support unit 17 can employ appropriate configurations. The pressing portion 15 only needs to be able to be repeatedly pressed, and the elastic support portion 17 only needs to secure an urging force that can separate the pressing portion 15 from the substrate 11 in an unloaded state. Both may be formed from the same material such as a silicone material, or may be formed from different materials.

  As shown in FIGS. 1 and 2, the contact member 20 includes a main body portion 21 disposed along the substrate 11 and the electrode 13, and a portion of the surface of the main body portion 21 facing the electrode 13 is partially formed. A plurality of convex portions 23 are formed so as to protrude. The periphery of each convex portion 23 is continuously surrounded by the surface of the main body portion 21. Here, the surface on the top side of the convex portion 23 becomes a contact portion that contacts the electrode 13 when pressed by a finger, and the surface of the main body portion 21 between the convex portions 23 is separated from the electrode 13 when pressed by a finger. It is the non-contact part arrange | positioned. Further, all the gaps between the plurality of convex portions 23 are continuous in the direction along the surface of the main body portion 21 from the peripheral edge 20 e of the main body portion 21 of the contact member 20.

  The main body portion 21 and the convex portion 23 are integrally formed of only conductive rubber. The conductive rubber is not particularly limited as long as it is elastically deformable and can provide sufficient conduction between the electrodes 13. For example, a conductive rubber such as carbon black may be used as a base rubber material such as silicone rubber. What knead | mixed and shape | molded the property filler can be used. As this conductive rubber, for example, a type A rubber hardness value measured in accordance with JIS K6253 is 90 ° or less and a compression set value measured in accordance with JIS K6262 is 45% or less. Can be used.

  The surface of each convex portion 23 of the contact member 20 is preferably formed in a surface shape of a conical surface such as a spherical surface, a curved surface such as a wavefront, a conical surface, or a pyramidal surface. If the shape is a curved surface or a conical surface, when contacting the surface of the flat electrode 13 or the surface of the substrate 11, it is easy to secure a wide non-contact portion, and the convex portion 23 is elastically deformed by being pressurized. As the pressing force increases, the contact area increases, so that the operational feeling can be improved, and further, the surface of the substrate 11 and the electrode 13 are in contact with the surface of the substrate 11 and the surface of the electrode 13 by being pressurized. This is because the contact pressure with respect to the surface can be varied for each position corresponding to the shape, so that the contact state can be easily released.

  In this embodiment, each convex part 23 is formed from a curved surface having the same spherical shape. In the case of a spherical shape, when the substrate 11 and the electrode 13 are pressed and brought into contact with each other, a wide contact area can be easily secured, which is particularly preferable.

  The protruding amounts H1 of the convex portions 23 from the main body portion 21 can be selected as appropriate, but it is preferable that the protruding amounts H1 of all the convex portions 23 from the main body portion 21 are the same. The distance from the projections 23 to the electrodes 13 can be made equal when mounted on the pressing portion 15, and the respective projections 23 can be equally brought into contact with the surface of the electrodes 13 when pressed. This is because it is easy to ensure an electrically stable connection state.

  Further, it is preferable that the protruding amount H1 of each convex portion 23 from the main body portion 21 is larger than the protruding amount H2 from the substrate 11 of the electrode 13 provided on the substrate 11 in a stepped shape. Accordingly, when the contact member 20 is brought into contact with the electrode 13, the main body 21 is separated from the surface of the electrode 13 by the convex portion 23 that is in contact with only the substrate 11 among the plurality of convex portions 23. This is because an energizing force can be obtained.

  Furthermore, it is preferable that each convex portion 23 has an angular and clear edge 24 between itself and the main body portion 21. Here, the angular edge 24 should be R0.5 or less, preferably R0.1 or less. In the angular edge 24, the surface shape is formed discontinuously with the edge 24 as a boundary. Therefore, even when the contact member 20 is pressed against the substrate 11 and the electrode 13 with a strong pressure, and the convex portion 23 is almost completely elastically deformed, the elastic force on both sides of the edge 24, the tension of the edge 24, etc. This is because the edge 24 and the portion adjacent to the edge 24 can be easily separated from the surface of the substrate 11 and the surface of the electrode 13 with a fine gap, and it is easy to prevent the entire contact member 20 from being completely adhered. .

  In addition, the arrangement pitch between the plurality of convex portions 23 is preferably set to be equal to or less than the arrangement pitch of the plurality of electrodes 13. This is because at least one convex portion 23 can be reliably brought into contact with each of the plurality of electrodes 13.

  Furthermore, in this contact member 20, fine unevenness may be provided on the entire surface of the main body 21 and the convex portion 23 on the side facing the substrate 11 and the electrode 13, for example, a surface on which these surfaces are blasted It may be. In addition to the function of preventing the entire contact member 20 from being in close contact with the shape of the convex portion 23, sticking is prevented by reducing the airtightness of the convex portion 23 at the contact portion with the substrate 11 and the electrode 13. This is because the effect is easy to improve.

  As this fine unevenness | corrugation, the 10-point average roughness (Rz) of the surface of the main-body part 21 and the convex part 23 may be finished to 1 micrometer or more, for example, In that case, a 10-point average roughness (Rz) is 1 micrometer. The thickness is preferably 20 μm or less. This is because if the surface roughness becomes excessively rough, fine particles are likely to be generated due to shaving or the like when repeatedly contacting the surface of the substrate 11 or the surface of the electrode 13 during use.

  Next, the operation of such a push button switch member 10 will be described.

  When the pushbutton switch member 10 is used in a state of being mounted facing the plurality of electrodes 13 provided on the substrate 11, first, in a normal time when no pressing operation is performed, as shown in FIG. The switch is held in a position separated from the substrate 11, and the contact member 20 is maintained in a state of being separated from the substrate 11 and the electrode 13.

  When the pressing portion 15 is pressed with a finger, as shown in FIG. 3A, the elastic support portion 17 is elastically deformed, the pressing portion 15 moves to the substrate 11 side, and the contact member 20 moves to the surface of the substrate 11 and the electrode 13. According to the pressing force of the pressing portion 15, it is directly contacted and pressed against the surface.

  Then, as shown in FIG. 3B, each convex portion 23 is pressed against one or both of the surface of the substrate 11 and the surface of the electrode 13 and elastically deforms. Thereby, the convex part 23 contacts each electrode 13 with a sufficient contact area, the electrodes 13 are connected by the contact member 20, and the switch is turned on.

  Thereafter, when the pressing force of the pressing portion 15 is released, the pressing portion 15 moves to the side away from the substrate 11 due to the restoring force of the elastic support portion 17, and the contact member 20 moves from the surface of the substrate 11 and the surface of the electrode 13. Separate. Thereby, the gap between the electrodes 13 is disconnected, and the switch is turned off again.

  In such a series of operations, when the pressing portion 15 is pressed with a normal pressing force and the electrodes 13 are connected by the contact member 20, each convex portion 23 of the contact member 20 is formed on the substrate 11. Although it contacts the surface and the surface of the electrode 13, the surface of the main body portion 21 between the convex portions 23 is maintained in a state of being separated from the surface of the substrate 11 and the surface of the electrode 13. A gap 27 continuous to the portion is formed. That is, the main body 21 is not in close contact with the surface of the substrate 11 or the surface of the electrode 13.

  Therefore, the sticking that prevents the contact member 20 from coming into close contact with the surface of the substrate 11 or the surface of the electrode 13 does not occur, and then the elastic support portion 17 is restored if the pressing force of the pressing portion 15 is released. The contact member 20 can be easily separated from the surface of the substrate 11 or the surface of the electrode 13 by force, and the switch can be turned off.

  Further, when the pressing portion 15 is pressed with an excessive pressing force, not only each convex portion 23 but also the main body portion 21 comes into contact with the surface of the substrate 11 or the surface of the electrode 13, and tentatively all surfaces of the contact member 20. Even if the main body 21 is urged in a direction away from the surface of the electrode 13 or the surface of the substrate 11 by a partially different force due to the elastic force of each convex 23. The periphery or the like is easily separated from the surface of the electrode 13 or the surface of the substrate 11, and air is easily introduced between the surface of the electrode 13 or the surface of the substrate 11 and the main body portion 21. For this reason, the contact member 20 can be easily separated from the surface of the substrate 11 or the surface of the electrode 13 by the restoring force of the elastic support portion 17 and the switch can be turned off.

  According to the contact member 20 as described above, the contact member 20 is formed of only conductive rubber and partially protrudes from the surface of the main body portion 21 so that the convex portion 23 is integrally formed. Can be manufactured more easily. And when such a convex part 23 is protruded and provided in the surface facing the electrode 13 of the main-body part 21 arrange | positioned along the board | substrate 11, when the press part 15 is pressed with a finger, Since the contact portion that contacts the electrode 13 and the non-contact portion that is separated from the electrode 13 are provided in the region facing the electrode 13, the contact member 20 is pressed against the surface of the electrode 13 or the surface of the substrate 11. The convex portion 23 can prevent the entire surface of the main body portion 21 from being completely adhered to the entire surface of the electrode 13 or the surface of the substrate 11, and it is difficult to produce a state where the suction cup is adsorbed. Therefore, it is possible to prevent sticking.

  In particular, since the convex portion 23 has an angular edge 24, even if the contact member 20 is pressed against the electrode 13 and greatly elastically deformed, the vicinity of the edge 24 is hardly adhered to the surface of the electrode 13, and the contact member 20. It is possible to prevent the entire region facing the electrode 13 from being in close contact with the surface of the electrode 13. Therefore, it is easy to prevent sticking more reliably.

  In addition, a plurality of convex portions 23 are provided, and each gap between the plurality of convex portions 23 is continuously formed from the peripheral edge 20e of the main body portion 21 of the contact member 20 along the surface of the main body portion 21 so as to allow ventilation. Therefore, air is more easily introduced from the periphery between the plate-shaped main body 21 and the surface of the electrode 13 or the surface of the substrate 11.

  Further, the electrode 13 is formed to protrude from the substrate 11, and the protrusion amount H <b> 1 of the convex portion 23 from the main body portion 21 is larger than the protrusion amount H <b> 2 of the electrode 13 from the substrate 11. The main body 21 can be maintained in a state of being separated from the surface of the electrode 13 by the non-contact convex portion 23 and can be biased with a sufficient force in a direction away from the surface of the electrode 13.

  In addition, since the surface of the convex portion 23 is formed in a curved surface or a conical surface, the distance between the surface of the electrode 13 and the surface of the substrate 11 or elastic deformation in each convex portion 23 depending on the position. The urging forces of the projections 23 can be made different from each other, whereby the convex portions 23 are easily separated from the surface of the electrode 13 and the surface of the substrate 11.

  Therefore, it is possible to prevent sticking more reliably.

  According to the push button switch member 10 using such a contact member 20, it is possible to perform a reliable switch operation while preventing sticking.

  In addition, the said embodiment can be suitably changed within the scope of the present invention. For example, in the above-described embodiment, the contact member 20 has been described as an example in which a plurality of convex portions 23 are provided on one surface of the main body portion 21, but the convex portions 23 are provided on both surfaces of the flat plate-like main body portion 21. Also good. Thereby, the directivity of the front and back can be eliminated from the contact member 20, and workability can be improved when the contact member 20 is fixed to the pressing portion 15 at the time of manufacture.

  Moreover, although the several convex part 23 was provided in the main-body part 21 in the above, you may make it easier to manufacture by making the convex part 23 provided in the main-body part 21 into one.

  Further, in the above description, an example in which the push button switch member 10 is independently supported by the elastic support portion 17 for each pressing portion 15 has been described. However, the plurality of pressing portions 15 have a flat shape or a three-dimensional shape. It may be supported by one elastic support portion 17.

In the above description, an example in which the angular edge 24 is formed on the boundary between the surface of the main body 21 around the convex portion 23 and the convex portion 23, that is, the peripheral edge of the convex portion 23 has been described. It is possible to obtain the same effect by forming the surface of the portion 23 into an angular shape.
[Embodiment 2 of the Invention]

  FIG. 4 shows a contact member used for the pushbutton switch member according to the second embodiment of the present invention. The pushbutton switch member of the second embodiment is the same as that of the first embodiment except that the contact member is different.

  The contact member 20 is formed with a plurality of recesses 25 partially recessed on the surface of the main body 21 disposed along the substrate 11 that faces the electrode 13. Each recessed part 25 can be comprised by the bottomed hole of suitable planar view shapes, such as circular, an ellipse, a triangle, a quadrangle | tetragon, and other polygons, and the through-hole which penetrates the main-body part 21 by various shapes, for example. Furthermore, the surface shape is preferably a curved surface or a conical surface. These recesses 25 may be the same shape or different. In the second embodiment, each recess 25 is a square bottomed hole.

  The surface of the main body 21 is formed flat, and the periphery of each recess 25 is surrounded by the continuous surface of the main body 21. Further, an angular edge is formed between each recess 25 and the surface of the main body 21.

  The amount of depression of the concave portion 25 from the main body portion 21 can be selected as appropriate, and each may have a different amount of depression. In addition, at least one of the recesses 25 provided at a position separated from the peripheral edge of the contact member 20 may be continuous from the peripheral edge of the contact member 20 through a ventilation path such as a groove. Further, the arrangement pitch between the recesses 25 is preferably a pitch at which at least one surface of the main body portion 21 arranged between the recesses 25 can contact each of the plurality of electrodes 13. It is preferable that the pitch is equal to or less than the arrangement pitch.

  Others are the same as those of the contact member 20 of the first embodiment.

  Even the contact member 20 having such a configuration and the push button switch member 10 using the contact member 20 can obtain the same operational effects as those of the first embodiment. When pressed against the surface of the substrate 13 or the surface of the substrate 11, the concave portion 25 prevents the entire surface of the main body portion 21 from being completely adhered to the surface of the electrode 13 or the surface of the substrate 11, thereby making it difficult for the sucker to adsorb. It is possible to prevent sticking.

  In particular, since the non-contact surface is provided in the recess 25, the flat surface of the main body 21 can be brought into contact with the electrode 13, and it is easy to make a stable connection between the contact member 20 and each electrode 13 during the pressing operation. can do.

Examples of the present invention will be described below.
[Example 1]
<Contact members>

  A contact member 20 as shown in FIGS. 4 and 5 having a plurality of convex portions 23 on both surfaces of the main body portion 21 was produced.

  The contact member 20 is a sheet obtained by kneading a conductive rubber KE3711-U (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) with a crosslinking agent C-8A (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) at a predetermined ratio. The molding material dispensed in a shape is put into a mold having a mold surface corresponding to the contact member 20 and whose surface is finished with a 10-point average roughness (Rz) of 2.5 μm. The rubber sheet 20A for contact members was produced by heat compression molding for a minute, and this rubber sheet 20A was punched into a diameter of 3 mm.

The main body 21 of the contact member 20 was 0.4 mm thick. The diameter in plan view on the surface of the main body 21 was 0.6 mm, and the protruding height from the surface of the main body 21 was 0.1 mm. Each convex part 23 was arranged at an angle of 45 degrees with respect to one side of the main body part 21, and the pitch along each of the four sides between the closest convex parts 23 was 0.71 mm.
<Push button switch member>

  With the contact member 20 fixed to the back surface of the pressing portion 15, an insert molded product in which the hard pressing portion 15 is supported by an elastic support portion 17 having a three-dimensional shape is produced, and for a push button switch as shown in FIG. Member 10 was manufactured.

In this pushbutton switch member 10, the restoring force of the elastic support portion 17 when restoring after pressing the pressing portion 15 was about 0.5 to 0.9N.
<Switch>

  The switch was configured by arranging and fixing the member for a push button switch 10 on the substrate 11 provided with the electrode 13.

As the substrate 11 on which the electrode 13 is provided, a comb-shaped gold-plated substrate was used. In this comb-shaped gold-plated substrate, an electrode 13 is formed by laminating a 35 μm copper foil, a 3 μm nickel-plated layer, and a 0.3 μm gold-plated layer in this order on the surface of the substrate 11. The width of 13 was 0.5 mm, and the gap between the electrodes 13 was 0.5 mm. The surface of the electrode 13 and the surface of the substrate 11 were formed on a smooth plane.
<Sticking resistance confirmation test>

  Using the thus obtained switch, a sticking resistance confirmation test was conducted.

  In the confirmation test, first, the pressing unit 15 is pressed with a load of 3N for 2 seconds, and then the initial operation is confirmed if the pressing unit 15 can be restored to the original position within 1 second by releasing the pressing force. did.

  Next, when the switch is placed in an 85 ° C. atmosphere and the pressing portion 15 is continuously pressed for 4 days with a load of 3N, whether the switch is turned off within 1 second when the load is released is determined. confirmed. During pressing, a current of 5 mA was continuously applied.

The results are shown in Table 1.
[Comparative Example 1]

  By forming the main body portion 21 without providing the convex portions 23 on both surfaces, the contact member of the comparative example was manufactured in the same manner as the embodiment except that the surface was flat, and the member for the push button switch and the switch were manufactured.

  Using the obtained switch of the comparative example, a sticking resistance confirmation test was performed.

The results are shown in Table 1. In the table, an off state is indicated by a circle, and an off state is indicated by an x.

  As is apparent from the table, the comparative example product having a flat surface facing the electrode 13 was equivalent in the initial operation, but had sticking after being left for 4 days. In the example product in which the convex portion 23 was provided on the opposite surface, no sticking occurred even after being left for 4 days.

It is a schematic sectional drawing which shows the member for pushbutton switches of Embodiment 1 of this invention. It is a partial expanded sectional view which shows the contact member of the member for pushbutton switches of Embodiment 1 of this invention. It is a figure explaining operation | movement of the member for pushbutton switches of Embodiment 1 of this invention, (a) shows the press state of the member for pushbutton switches, (b) shows the contact state of the contact member in the state. The contact member of Embodiment 2 of this invention is shown, (a) is sectional drawing, (b) is a partial top view. It is a top view before the cutting | disconnection of the contact member used in the Example of this invention. It is AA sectional drawing of FIG. 5 which shows the contact member used in the Example of this invention. It is a figure explaining the member for conventional pushbutton switches, (a) is a schematic sectional drawing, (b) It is a partial expanded sectional view of a contact member. It is a figure explaining operation | movement of the conventional member for pushbutton switches, (a) shows the press state of the member for pushbutton switches, (b) shows the contact state of the contact member in the state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pushbutton switch member 11 Board | substrate 13 Electrode 15 Press part 17 Elastic support part 20 Contact member 21 Main-body part 23 Convex part

Claims (5)

A pressing portion disposed opposite to the electrode provided on the substrate; an elastic support portion capable of supporting the pressing portion apart from the substrate; and a contact member disposed on the substrate side of the pressing portion. The contact member is configured to be in direct contact with the electrode when the pressing portion is pressed, and separated from the electrode when the pressing of the pressing portion is released.
The contact member is formed only of conductive rubber, and in a region facing the electrode, a contact portion that contacts the electrode when the pressing portion is pressed, and a non-contact portion that is separated from the electrode A member for a push button switch, comprising:   The contact member includes a convex portion that protrudes from a surrounding surface and has the contact portion, or a concave portion that is recessed from the surrounding surface and has the non-contact portion. The member for pushbutton switches according to claim 1.   The member for a pushbutton switch according to claim 2, wherein the convex portion or the concave portion includes an angular edge.   The surface of the said pressing part side of the said electrode and the said board | substrate consists of a plane, The surface of the said convex part or the said recessed part is formed in the curved surface or the cone surface shape, The Claim 2 or 3 characterized by the above-mentioned. A member for a push button switch.   The surface of the electrode is formed to protrude from the substrate, and a height difference between the contact portion and the non-contact portion is greater than a height difference between the surface of the electrode and the surface of the substrate. The member for a pushbutton switch according to any one of claims 1 to 4.

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