JPH067128U - Membrane switch - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a membrane switch capable of enduring long-term use and having an improved appearance. [Structure] A membrane 14 composed of a lower membrane 11, a spacer 12 and an upper membrane 13 which are sequentially stacked.
And a cutout 12a provided in the spacer in at least one switch region of the membrane, and a first contact provided on the upper surface of the lower membrane and the lower surface of the upper membrane so as to face each other in each cutout. 11a and the second contact 13a, and an embossed portion 15 which is placed on the membrane and projects upward in the switch region.
an embossed sheet 15 having a, a double-sided adhesive sheet 16 provided on the embossed sheet in a region excluding each embossed portion, and a flat cover plate 17 placed on the double-sided adhesive sheet. So that the membrane switch 10
Make up.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a membrane switch having a click action, which is used as an input key for various devices.

[0002]

[Prior art]

 Conventionally, such a membrane switch is configured as shown in FIG. 2, for example. That is, in FIG. 2, a membrane switch 1 is composed of a lower membrane 2, a spacer 3 and an upper membrane 4 which are sequentially stacked and placed, and a membrane 5 having at least one switch region, and a spacer 6 from above. And the cover plate 7 mounted via the.

In each switch region, the membrane 5 is provided with a notch 3 a provided in the spacer 3 and a first contact 2 a provided on the upper surface of the lower membrane 2 so as to face each other in each notch 3 a. And a second contact 4a provided on the lower surface of the upper membrane 4.

The spacer 6 has a switch region cut out, and a metal click spring 8 curved upward in a concave shape is fixedly held in the cutout 6a.

According to the membrane switch 1 configured as described above, when the surface of the desired switch region of the cover plate 7 is pushed down with a finger or the like, the central portion of the click spring 8 provided in the lower portion thereof is moved downward. It will be pressed. As a result, the central portion of the click button 8 is deformed downward, and the lower surface of the central portion presses the switch area of the membrane downward.

As a result, the second contact 4a of the upper membrane 4 of the membrane 5 comes into contact with the first contact 2a of the lower membrane 2 in the notch 3a of the spacer 3, and the switch is turned on. Become.

At this time, since the click spring 8 is inverted with a click action when the switch area of the cover plate 7 is pressed based on its shape, the click feeling is generated during the switch operation. Is obtained.

[0008]

[Problems to be solved by the device]

 However, in the thus configured membrane switch 1, since the click spring 8 is made of metal, the click spring 8 may be cracked and lose its feel after long-term use.

Further, in each switch region, the cover plate 7 is slightly lifted by the central portion of the click spring 8 and is not flat, so that there is a problem that the cover plate 7 does not look good.

In view of the above points, the present invention has an object to provide a membrane switch which can endure long-time use and can be improved in appearance.

[0011]

[Means for Solving the Problems]

 According to the present invention, the above object is to provide a membrane comprising a lower membrane, a spacer and an upper membrane, which are sequentially stacked, and a cutout portion provided in the spacer in at least one switch region of the membrane. , A first contact and a second contact respectively provided on the upper surface of the lower membrane and the lower surface of the upper membrane so as to face each other in each notch, and mounted on the membrane and in the switch area, An embossed sheet having an embossed portion protruding upward, a double-sided adhesive sheet provided on the embossed sheet in a region excluding each embossed portion, and a flat cover plate placed on the double-sided adhesive sheet. Achieved by a membrane switch, which includes and.

[0012]

[Action]

 According to the above configuration, when the switch area of the cover plate is pressed with fingers or the like during the switch operation, the embossed portion of the embossed sheet is deformed downward with a click feeling due to the lower surface of the cover plate. Then, in the switch area of the membrane, the first contact and the second contact come into contact with each other in the notch provided in the spacer.

Further, since the metallic click spring is not used, the click spring is not cracked even if it is used for a long time, and the durability can be improved. Since the surface of the plate is flat, the appearance can be improved.

[0014]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of the membrane switch according to the present invention.

The membrane switch 10 is composed of a lower membrane 11, a spacer 12 and an upper membrane 13, which are placed one on top of the other, and has a membrane 14 having at least one switch region, and is placed on the membrane 14. And an embossed sheet 15 made of a polyester material having an embossed portion 15a protruding upward in the switch region, and a double-sided adhesive sheet 16 provided on the embossed sheet 15 in a region excluding each embossed portion 15a. , A flat cover plate 17 placed on the double-sided adhesive sheet 16.

In each switch region, the membrane 14 is provided with a notch 12 a provided in the spacer 12 and a first contact provided on the upper surface of the lower membrane 11 so as to face each other in each notch 12 a. 11 a and a second contact 13 a provided on the lower surface of the upper membrane 13.

The membrane switch 10 according to the present invention is configured as described above, and when the switch area of the cover plate 17 is pushed down with a finger or the like, the lower surface of the cover plate 17 will have the corresponding embossed portion of the embossed sheet 15. 15a will be pressed. As a result, the embossed portion 15a is deformed downward with a click feeling, and the lower surface thereof presses the switch region of the membrane 14 downward.

Therefore, in the membrane 14, the contact 13a of the upper membrane 13 is brought into contact with the contact 11a of the opposing lower membrane 11 in the notch 12a of the spacer 12. Thus, the first contact 11a and the second contact 13a come into contact with each other, and the switch is turned on.

Here, when a finger or the like is released from the cover plate 17, the embossed portion 15a of the embossed sheet 15 returns to the state before being pressed (illustrated) based on its inherent elasticity, whereby the cover plate 17 is released. 17 is moved upward and returns to the flat state before the operation, and the membrane 14 is switched off by the elasticity of the upper membrane 13 causing the second contact 13a to separate from the first contact 11a. It will return to the state of.

In the above switch operation, the embossed sheet 15 is fixedly held to the lower surface of the cover plate 17 by the double-sided adhesive sheet 16, so that the embossed sheet 15 is displaced with respect to the membrane 14, There is no such thing as distortion.

[0021]

[Effect of device]

 As described above, according to the present invention, it is possible to provide an extremely excellent membrane switch that can be used for a long time and can be improved in appearance.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a membrane switch according to the present invention.

FIG. 2 is a schematic sectional view showing an example of a conventional membrane switch.

[Explanation of symbols]

 10 Membrane Switch 11 Lower Membrane 11a First Contact 12 Spacer 12a Notch 13 Upper Membrane 13a Second Contact 14 Membrane 15 Embossing Sheet 15a Embossing 16 Double-sided Adhesive Sheet 17 Cover Plate

Claims (1)

[Scope of utility model registration request] 1. A membrane composed of a lower membrane, a spacer and an upper membrane, which are sequentially stacked, and a cutout portion provided in the spacer in at least one switch region of the membrane, and facing each other in each cutout portion. As described above, the first contact and the second contact respectively provided on the upper surface of the lower membrane and the lower surface of the upper membrane, and the embossed portion that is placed on the membrane and that protrudes upward in the switch region are provided. An embossed sheet having, a double-sided pressure-sensitive adhesive sheet provided in a region excluding each embossed portion on the embossed sheet, and a flat cover plate placed on the double-sided pressure-sensitive adhesive sheet. Membrane switch.