JPH0525632U - Keyboard structure - Google Patents

Abstract

(57) [Summary] [Structure] A rubber sheet 1 is held via a spacer 2 on a membrane switch 4 provided on a keyboard substrate 3 and having a membrane switch contact portion 5. By pressing the button portion 8 of the above, the convex portion pushes and operates the membrane switch contact portion 5. [Effect] Even if oil or grease penetrates from the button surface during operation, the contact sheet of the membrane switch will not be affected by the surface sheet of the membrane switch, and it will withstand long-term use, and will not use sheet metal with clicks. It is possible to reduce parts and cost.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a keyboard structure of a telephone or the like.

[0002]

[Prior Art]

 Conventionally, this type of keyboard structure is formed by contact between the conductive rubber contact 7 of the rubber sheet 10 having a click and the contact portion 6 of the keyboard substrate 9 as shown in FIGS. 2 (a) and 2 (b), or As shown in FIG. 3, the dome-shaped sheet metal 13 having a click is inserted between the membrane switch 16 and the rubber sheet 12 to operate the keyboard.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional keyboard structure, since the human finger directly touches the silicon rubber key sheet during operation, the oil and fat that has been exposed from the inside of the body permeates the inside of the button surface over time, and the conductive parts are When it reaches, the phenomenon of increase in resistance value occurs due to the effect of oil and fat as an insulator, and as the phenomenon further progresses, oil and fat are exposed on the surface of the conductive part, resulting in poor contact. . Further, in the structure using the dome-shaped sheet metal, there is a problem that it is difficult to assemble because the sheet metal is inserted between them, so that it is difficult to assemble and costs are high.

[0004]

[Means for Solving the Problems]

 The keyboard structure of the present invention comprises a membrane switch provided on a keyboard substrate and having a switch contact portion, a rubber sheet held on the membrane switch via a spacer, and the switch contact provided on the rubber sheet. And a button portion having a convex portion that pushes the portion.

[0005]

【Example】

 Next, the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. FIG. 1A is a perspective view and FIG. 1B is a sectional view.

In this embodiment, a membrane switch 4 provided on a keyboard substrate 3 and having a membrane switch contact portion 5, a rubber sheet 1 held on the membrane switch 4 via a spacer 2, and this rubber sheet 1 and a button portion 8 having a convex portion which pushes the membrane switch contact portion 5. That is, as shown in FIG. 1, the rubber sheet 1 is held on the membrane switch 4 provided on the keyboard substrate 3 via the spacer 2. The rubber sheet 1 has a cross section as shown in FIG. 1B because the button portion 8 has a click.

In this embodiment, by pushing the button portion 8 of the rubber sheet 1, the convex portion pushes the membrane switch contact portion 5 provided on the membrane switch 4 to operate.

[0009]

[Effect of the device]

 As described above, according to the present invention, even if oil or grease penetrates from the button surface to the inside during operation, the contact sheet of the membrane switch is not affected by the surface sheet of the membrane switch, and it can withstand long-term use. In addition, since no sheet metal having clicks is used, the number of parts can be reduced and the cost can be greatly reduced.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 (a) is a perspective view and FIG. 1 (b) is a sectional view.

2A and 2B show an example of a conventional keyboard structure. FIG. 2A is a perspective view and FIG. 2B is a sectional view.

FIG. 3 is a cross-sectional view showing another example of the conventional structure.

[Explanation of symbols]

 1,10,12 Rubber sheet 2,11,15 Spacer 3,9,17 Keyboard board 4,16 Membrane switch 5,14 Membrane switch contact part 6 Contact part 7 Conductive rubber contact 8,18 Button part 13 Dome sheet metal

Claims (1)

[Scope of utility model registration request] 1. A membrane switch provided on a keyboard substrate and having a switch contact portion, a rubber sheet held on the membrane switch through a spacer, and a switch contact portion provided on the rubber sheet. A keyboard structure comprising: a button portion having a pushing convex portion.