JPH0532912Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention includes a first substrate provided with a movable contact, a key spacer provided at a position corresponding to the contact,
A key input device formed by overlapping a second board provided with fixed contacts.

<Prior art> Conventionally, a key input device has a first key input device, as shown in FIG.
flexible substrate 11 and this first substrate 11
A second substrate 12 facing the substrate, a key contact 13 provided on the opposing surface of each substrate, and a key spacer 14 interposed between the first substrate 11 and the second substrate 12,
This key spacer 14 is fixed to each board with an adhesive 15 and covered with a decorative film 16 as an exterior. By the way, as shown in FIG. 4, the key spacer 14 has through holes 18 formed only at positions corresponding to the key contacts 13 and the press operation area 17. When inserted between the substrate 11 and the second substrate 12, air is trapped in the through hole 18. For this reason, the air pressure inside the through hole 18 changes due to changes in the external air pressure, and even when operated with the same pressing force, there are times when key input is possible and times when it is not possible, and as a result, key input errors are likely to occur.

Therefore, in order to overcome this drawback, a key spacer 14 has been proposed in which a passage connecting the through holes is provided as shown in FIGS. 5 and 6. In these cases, the effect of changes in external pressure is reduced by enlarging the sealed space.

<Problems to be Solved by the Invention> However, in the key spacer 14 of Figs. 5 and 6, the through hole 18 is made large in order to provide a passage, and the size of the key becomes large.
This resulted in a smaller space between adjacent keys, which made the keys less easy to use. Also, if the through holes 18 of the key spacer 14 were made larger, there was a risk of the key breaking or bending, making the key difficult to handle. Furthermore, the shape of the through holes 18 in the key spacer 14 became complicated, which was a drawback in that it increased costs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a key input device which eliminates the conventional drawbacks, prevents the air in the through hole from being sealed, prevents incorrect key input, and has good operability.

<Means for solving the problem> The present invention includes a first substrate provided with movable contacts, a key spacer provided with a through hole at a position corresponding to the contact, and a second substrate provided with fixed contacts. The key input device is characterized in that the key spacer is constructed using a sheet woven with hollow fibers or a nonwoven fabric using hollow fibers.

<Function> In the key input device of the present invention, the key spacer is formed of a member containing hollow fibers, so that when the pressing operation area is operated, the air in the through hole of the key spacer easily moves to the surroundings. Can be done. Therefore, key input can always be performed accurately without being affected by changes in external atmospheric pressure.

<Embodiment> Hereinafter, a key input device showing an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of a main part of a key input device. As shown in the figure, 1 is a first substrate formed of a key contact film, and 2 is a second substrate provided at a position facing the first substrate 1 and formed of a key contact film. 3a is the first substrate 1
3b is a fixed contact provided on the second substrate 2 facing the movable contact 3a; 4 is a fixed contact provided between the first substrate 1 and the second substrate 2; A key spacer, 6 is an adhesive for bonding the key spacer 4 to the first substrate 1 and the second substrate 2, and 7 is a decoration that covers the first substrate 1 and the second substrate 2 as an exterior. It is a film for use.

The key spacer 4 is as shown in FIG.
It is composed of a woven fabric in which hollow fibers 5 are woven into a sheet shape, or a nonwoven fabric processed with an adhesive 6 to form a sheet shape. Therefore, air can easily move between the through holes.

According to the key input device configured in this way, the air in the through hole 9 of the key spacer 4 can freely flow into the other through hole 9, and is not sealed in any way. Therefore, even if the air in the through hole 9 is expanded due to a change in the external air pressure, when the pressing operation area 8 is pressed, the air in the through hole 9 will flow extremely smoothly into other through holes. Flow inward.

Therefore, the movable contact 3a on the first substrate is
It is possible to contact the fixed contact 3b on the substrate with a constant pressing force at all times.

<Effects> As explained above, according to the present invention, a key spacer is provided between the first substrate and the second substrate and has a through hole at a position corresponding to the key contact point and the pressing operation area. Since it is constructed using a sheet woven with hollow fibers or a nonwoven fabric using hollow fibers, the air in the through holes of the key spacer can be moved to the surrounding area in response to key operations. Therefore, key input errors can be prevented without increasing costs, and a key input device with good operability can be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of a key input device showing an embodiment of the present invention, Fig. 2 is a sectional view of the key spacer of the same key input device, and Fig. 3 is a sectional view of the main part of a conventional key input device. , FIGS. 4 to 6 are explanatory diagrams illustrating the shape of the through hole provided in the key spacer of the key input device. 1...First substrate, 2...Second substrate, 3...
Key contact, 4...Key spacer, 5...Hollow fiber, 9...Through hole.

Claims (1)

[Claims for Utility Model Registration] A first substrate provided with a movable contact, a key spacer provided with a through hole at a position corresponding to the contact, and a second substrate provided with a fixed contact are stacked together. A key input device, wherein the key spacer is constructed using a sheet woven with hollow fibers or a nonwoven fabric using hollow fibers.