JP2003109464A - Sheet member and push switch using the same - Google Patents

Abstract

(57) [Problem] To provide a sheet member used for various electronic devices and a push switch using the same, which has a good operation feeling and is easy to manufacture. SOLUTION: On a lower surface of a film sheet 1 having flexibility, a pressing portion 10 protruding in a cylindrical shape is formed by printing, and a diaphragm 4 having a central portion protruding in a dome shape is arranged below the pressing portion 10. By constructing the sheet member as described above, it is possible to obtain a sheet having a good operation feeling and easy to manufacture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet member used in an operating portion of various electronic devices such as a mobile phone and a computer, and a push switch using the same.

[0002]

2. Description of the Related Art A conventional sheet member and a push switch using the same will be described with reference to FIGS.

FIG. 4 is a cross-sectional view of a conventional push switch. In FIG. 4, reference numeral 1 denotes a flexible film sheet such as polyethylene terephthalate, whose lower surface is made of resin with an adhesive (not shown). A cylindrical pressing portion 2 is attached.

Reference numeral 3 denotes a single-sided adhesive tape, 4 a diaphragm made of a thin metal plate such as a copper alloy having a central portion protruding upward in a dome shape, 5 a base sheet such as polyethylene terephthalate, and the diaphragm 4 a single-sided adhesive tape 3 Is fixed to the base sheet 5, and the central portion is arranged below the pressing portion 2.

Further, 6 is a spacer whose upper and lower surfaces are coated with an adhesive, and the base sheet 5 and the film sheet 1 are bonded together by this spacer 6 to form a sheet member.

A wiring substrate 7 made of an insulating film such as polyethylene terephthalate has a pair of fixed contacts 7A and a plurality of wiring patterns (not shown) on its upper surface.

Further, the wiring board 7 is the base sheet 5
A fixed contact 7A is attached to the lower surface of the diaphragm, and is arranged with a gap from the diaphragm 4 to form a push switch.

In the above structure, when the film sheet 1 is pressed, the central portion of the diaphragm 4 is bent by being pressed against the lower surface of the pressing portion 2 and comes into contact with the pair of fixed contacts 7A, so that the fixed contacts 7A move the diaphragm 4. Electrically connected via.

Further, when the pressing operation is released, the elastic restoring force of the diaphragm 4 restores the original state.

FIG. 5 is a sectional view of another push switch. As shown in FIG. 5, instead of sticking the individual pressing portions 2 to the lower surface of the film sheet 1, a resin pressing portion 8 is used. 1 is formed by printing on the lower surface.

[0011]

However, in the above-mentioned conventional sheet member and the push switch using the same, when the pressing portion 2 of the individual piece is attached to the film sheet 1, the pressing portion 2 is omitted. Since there is a problem in that it takes time to manufacture because it is necessary to perform bonding so as not to cause a positional deviation when bonding, there is a problem in that when the pressing portion 8 is formed by printing, the tip is blunted and has a substantially spherical shape. Therefore, there is a problem that the area for pressing the diaphragm 4 is reduced and it is difficult to obtain a good operation feeling.

The present invention solves the above-mentioned problems of the prior art, and provides a good operation feeling during pressing operation.
An object of the present invention is to provide a sheet member that can be easily manufactured and a push switch using the same.

[0013]

In order to achieve the above object, the present invention has the following constitution.

According to the first aspect of the present invention, the pressing member protruding on the lower surface of the film sheet is formed in a cylindrical shape by printing to form a sheet member, and the diaphragm is pressed by the hollow end surface of the pressing member. Therefore, the diaphragm can be pressed in a predetermined area, a good operation feeling can be obtained, and since the pressing portion is formed by printing, it is possible to obtain a sheet member that can be easily manufactured.

According to a second aspect of the present invention, in the first aspect of the invention, the pressing portion diameter is 1/5 to 3 of the diaphragm diameter.
/ 5, it has an effect that a good operation feeling can be obtained, and a defective return of the diaphragm can be prevented.

According to a third aspect of the present invention, in the first aspect of the invention, the pressing portion is a thermosetting resin, and the pressing portion is deformed even under high temperature and high humidity as compared with the thermoplastic resin. It has a difficult effect.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the film sheet is made light-transmissive, and a light-transmissive electrode layer, a light emitting layer, and a back electrode layer are formed on the lower surface of the film sheet. Since the EL element layer is formed by the light transmissive electrode layer, the light emitting layer, and the back electrode layer, the EL element layer is made to emit light so that the operating portion can be easily identified even in the dark surroundings. It has the effect that it can be performed.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the wiring board having fixed contacts facing the diaphragm with a predetermined gap on the upper surface is arranged below the sheet member to push the switch. Is configured,
This has the effect of providing a push switch that gives a good feeling of operation and is easy to manufacture.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. It should be noted that the same components as those described in the section of the related art are designated by the same reference numerals to simplify the detailed description.

(Embodiment 1) The invention according to claims 1 to 3 and 5 of the present invention will be described with reference to Embodiment 1.

FIG. 1 is a sectional view of a push switch according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a flexible film sheet such as polyethylene terephthalate, and an epoxy-based film sheet or the like is provided on the lower surface thereof. The cylindrical pressing portion 10 is formed by printing with the thermosetting resin.

Reference numeral 3 is a single-sided adhesive tape, 4 is a diaphragm made of a metal thin film such as a copper alloy having a central portion protruding upward in a dome shape, 5 is a base sheet such as polyethylene terephthalate, and the diaphragm 4 is a single-sided adhesive tape 3. Is fixed to the base sheet 5, and the central portion is arranged below the pressing portion 10.

The diameter of the pressing portion 10 is the diaphragm 4
The diameter is 1/5 to 3/5 of the diameter.

Further, 6 is a spacer whose upper and lower surfaces are coated with an adhesive, and the base sheet 5 is attached to the film sheet 1 by the spacer 6 to form a sheet member.

A wiring substrate 7 made of an insulating film such as polyethylene terephthalate has a pair of fixed contacts 7A and a plurality of wiring patterns (not shown) provided on its upper surface.

Further, the wiring board 7 is the base sheet 5
A fixed contact 7A is attached to the lower surface of the diaphragm, and is arranged with a gap from the diaphragm 4 to form a push switch.

In the above structure, when the film sheet 1 is pressed, the central portion is pressed by the predetermined area of the hollow end surface of the pressing portion 10, the central portion of the diaphragm 4 bends, and the diaphragm 4 is inverted with a feeling of moderation. By operating and contacting the pair of fixed contacts 7A, the fixed contacts 7A
Are electrically connected via the diaphragm 4.

When the pressing operation is released, the elastic restoring force of the diaphragm 4 restores the original state.

As described above, according to this embodiment, since the central portion of the diaphragm 4 is pressed by the hollow end surface of the pressing portion 10 during the pressing operation, the diaphragm can be pressed in a predetermined area and a good operation feeling can be obtained. At the same time, since the pressing portion is formed by printing, it is possible to obtain a sheet member that can be easily manufactured and a push switch using the sheet member.

Further, in this case, when the diameter of the pressing portion 10 is smaller than the diameter of the diaphragm 4, the moderation sensation during the pressing operation becomes small, and when it is large, the diaphragm is released when the pressing operation is released. Since the restoring force of 4 is small, the diameter of the pressing portion is 1/5 to 3 of the diameter of the diaphragm 4.
By setting the diameter to / 5, it is possible to obtain a good feeling of operation and prevent the return failure.

Further, when the pressing portion 10 is made of a thermosetting resin, the pressing portion 10 is less likely to be deformed under high temperature and high humidity as compared with the thermoplastic resin, so that a good operation feeling can be obtained.

(Second Embodiment) Using the second embodiment,
The invention of claim 4 will be described.

The same components as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 2 is a sectional view of a push switch according to a second embodiment of the present invention. In FIG. 2, reference numeral 20 is a light-transmissive and flexible film sheet such as polyethylene terephthalate, which is provided on the lower surface thereof. Is a sputtering method, an electron beam method, or the like, or indium tin oxide or tin oxide,
The light transmissive electrode layer 21A is formed by printing phenoxy resin, epoxy resin, fluororubber, or the like in which conductive particles such as indium oxide are dispersed.

Then, a light-emitting body layer 21B in which zinc sulfide, which is a base material for light emission, is dispersed in a highly dielectric fluororubber or a cyano resin, etc., is laminated on the light-transmissive electrode layer 21A, and similarly, a high-dielectric material layer 21B. Dielectric layer 21C in which barium titanate or the like is dispersed in resin, back electrode layer 21 of silver or carbon range
Insulating layer 21E of D, epoxy resin, polyester resin, etc.
Are sequentially printed to form the EL element layer 21.

22A and 22B are conductive patterns each having one end connected to the transparent electrode layer 21A and the back electrode layer 21D, and are formed by printing with an epoxy resin or a polyester resin in which silver or carbon is dispersed.

Further, as in the first embodiment, a cylindrical pressing portion 10 made of a thermosetting resin such as epoxy is printed on the lower surface of the insulating layer 21E.

Then, the central portion of the diaphragm 4 fixed to the base sheet 5 by the single-sided adhesive tape 3 is arranged on the lower surface of the pressing portion 10, and the base sheet 5 and the film sheet 20 are bonded by the spacer 6 to form a sheet member. At the same time, the wiring board 7 having the fixed contacts 7A on the upper surface is bonded to the lower surface of the base sheet 5 to form a push switch.

With the above structure, the film sheet 20
When the pressing operation is performed, the hollow end surface of the pressing portion 10 presses the diaphragm 4 to bend the central portion, and the diaphragm 4 inverts to contact the fixed contact 7A, thereby electrically connecting the pair of fixed contacts 7A. In addition, when the pressing operation is released, the elastic restoring force of the diaphragm 4 restores the original state.

The light transmissive electrode layer 2 of the EL element layer 21
1A and the back electrode layer 21D, conductive patterns 22A, 22
When an AC voltage is applied via B, the light emitting layer 21B emits light, and this light illuminates the upper surface through the film sheet 20.

Therefore, the upper surface of the film sheet 20 on which the pressing portion 10 is formed is illuminated, and the operating portion can be easily visually recognized even when the surroundings are dark.

As described above, according to the present embodiment, the film sheet 20 is made light-transmissive, and the light-transmissive electrode layer 21A, the light-emitter layer 21B and the back electrode layer 21D are stacked on the lower surface of the film sheet 20 to form the EL element layer 21. By forming the EL element layer 2
By making 1 emit light, it is possible to easily identify the operation unit even when the surroundings are dark.

In the above description, the diaphragm 4 is made of a thin metal plate. However, as shown in the sectional view of FIG. 3, a flexible insulating film 30 such as polyethylene terephthalate is provided above the diaphragm. The flexible contact 3 is formed on the lower surface with a dome shape and has a lower surface made of carbon-dispersed epoxy resin or polyester resin.
The present invention can be implemented with a configuration in which 1A is printed to form the film diaphragm 31B.

[0044]

As described above, according to the present invention, it is possible to obtain a sheet member which has a good operation feeling and is easy to manufacture and a push switch using the same, which is advantageous curing.

[Brief description of drawings]

FIG. 1 is a sectional view of a push switch according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a push switch according to a second embodiment of the present invention.

FIG. 3 is a sectional view according to another embodiment.

FIG. 4 is a sectional view of a conventional push switch.

FIG. 5 is a sectional view of the other push switch.

[Explanation of symbols]

1,20 film sheet 3 single-sided adhesive tape 4 diaphragm 5 base sheet 6 spacers 7 wiring board 7A fixed contact 10 Pressing part 21 EL element layer 21A Light-transmissive electrode layer 21B luminous body layer 21C dielectric layer 21D back electrode layer 21E insulation layer 22A, 22B conductive pattern 30 insulating film 31A movable contact 31B film diaphragm

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koichi Sannohe             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5G006 AA02 AB25 AZ01 CB05 CB09                       CD04 FB04 FD02 JA01 JB06                       JC01 JD01                 5G023 AA20 CA30

Claims (5)

[Claims] 1. A flexible film sheet having a pressing portion formed on a lower surface thereof and a diaphragm disposed below the pressing portion and having a central portion protruding in a dome shape, wherein the pressing portion has a cylindrical shape. Sheet member printed on. 2. The pressing portion diameter is 1/5 to 3 of the diaphragm diameter.
The sheet member according to claim 1, which is / 5. 3. The sheet member according to claim 1, wherein the pressing portion is made of a thermosetting resin. 4. The sheet member according to claim 1, wherein the film sheet is made light-transmissive, and a light-transmissive electrode layer, a light emitting layer and a back electrode layer are formed on the lower surface of the film sheet. 5. A push switch in which a wiring board having fixed contacts facing the diaphragm with a predetermined gap on an upper surface is arranged below the sheet member according to claim 1.