JPS58129714A - Membrane key - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a membrane key used in an operating section of an electronic device such as a microwave oven.

Conventionally, this type of menglen key has a plurality of keypads 2.3 printed on one side of a flexible surface-transparent resin 1 such as polyester, as shown in the exploded perspective view of FIG.
And contact electrode A at the bottom.

A pair of vertically opposing electrodes were formed from a flexible polyester resin 4 on which B was printed and a flexible polyester resin 7' on which contact electrodes A' and B' were printed. It is inserted between polyester resin 4.5 and always -1-
A resin spacer 8 having one hole 6.7 for creating a gap between the electrodes A and A' and between B and B', and a resin spacer 8 provided under the flexible polyester resin 5 and having the above structure. It consists of a reinforcing plate 9 made of a resin plate or an insulated metal plate for reinforcing the shrine, and the resin spacer R
It is also used to insulate the wiring electrode part of the ID sensor.
．． was.

In the above conventional example, the "start" key and "
The area of the large keypad 20 corresponding to the "stop" key is approximately four times larger than the area of the small keypad 30 corresponding to the normal "numeric" key. There are 6 spacer holes 1-1 in the 1111R spacer 8 that corresponds to the keypad 2, and the width a of the short side of the opening hole 6 is set to the large keypad 3 so that there is no difference in pressing force with the small key. Since the length b of one side of the spacer opening corresponding to the spacer opening TL 7 was approximately the same as the length b of one side, the opening hole 6 had an isotropic shape. Therefore,
There is a large discrepancy between the display area of the operating area of the large keypad 2 and the area of the opening hole 6 of the spacer corresponding to f-1 of the actual operating area, causing the user to feel a sense of harmony and causing key human error. There were problems such as inducing

Furthermore, when the opening holes 6 and 7 are set for the large keypad 2 and the small keypad 3 according to their respective display sizes, the surface transparent resin 1. If the thickness and quality of the polyester resin 4.5 and the resin spacer 8 are selected, the contact electrodes C and C' of the large keypad 2 may be in constant contact with each other, or erroneous input may occur if the key is touched only slightly. On the other hand, if you select the advantage of the membrane key mainly around the suppressed state of the large keypad 2, the suppression of the small keypad 3 will be increased, and you will not be able to input normally unless you do 2. There were drawbacks.

The present invention has been made in view of the above-mentioned points, and aims to eliminate the difference in key suppression and eliminate the discomfort felt when operating a switch in a membrane key having large and small key bands. .

To achieve the above object, the present invention provides a membrane key having a doll keypad and a small keypad,
Contact electrodes 7 each having an area approximately equal to the area of the large keypad are provided, and a partition portion is provided to divide the spacer opening hole of the resin spacer installed between the electrical rods for the contact 1. It is also characterized by the ability to adjust the gap between the contact points and the poles.

Embodiments of the present invention will be described below based on the drawings. Second
The figure is an exploded perspective view of a membrane key showing an embodiment of the present invention, and parts having the same functions as the conventional example shown in FIG. c, c
' is the contact electrode of the large keypad 2 that corresponds to the ``scoot'' key and the ``stop j key.
It has approximately the same area as 6' and 6' are resin spacers 8
A partition 8' is provided approximately in the medium heat section, and the sum of the areas of the openings 6' and 6'' is
- Equal to the area of the contact point tic, C' and the large keypad 2. ] The partition part 8' of the resin spacer 8 has approximately the same area as the large keypad 2 in order to be placed between the contact electrodes C and C' in an insulated state. It has the function of preventing the contact electrodes c and c' from coming extremely close to each other, and eliminates uneven pressing force of the large key pad 2, making it much more pressing force than the above-mentioned small key pad 3. Contact type IC, C' with small pressing force
The inconvenience of contact between the two can be completely eliminated.

FIG. 3 is a perspective view of a main part of a resin spacer showing another embodiment of the present invention, in which a plurality of small island-shaped spacers 10 are formed in an opening 6″′ of a resin spacer 8. This small spacer 10 divides the area of the aperture 6''' equimetrically to set the gap between the contact electrodes C and C' to an optimum value. Therefore, whether the keys on the large keypad or the small keypad are operated, input can be performed reliably with the same pressing force.

As explained in -1- below, the present invention provides a membrane key having a large keypad and a small keypad.
” 2. Area and approximation of large ghee pad 1. Since contact electrodes each having a large area are provided, and a partition is provided to divide the spacer opening hole of the resin spacer installed between the contact electrodes, variations in suppression due to the large key pad and the small key band can be avoided. This can reduce the sense of discomfort in key operations, making it easier to operate keys on frequently used large key pads, and increasing the reliability of key switches, which can have a wide range of applications.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a membrane key showing a conventional example;
FIG. 2 is an exploded perspective view of a membrane key showing an embodiment of the invention, and FIG. 3 is a perspective view of essential parts of a resin spacer showing another embodiment of the invention. 2...Large keypad, 3...Small keypad, 4.5...Polyester resin, 6', 6"...
・Opening hole, 8... Resin spacer, 8'... Partition part, 9... Reinforcement plate, 10... Shimakai spacer,
c, c'... Contact electrodes. Agent Patent attorney Aihiko Fuku (and 2 others) Sagi D 69

Claims (1)

[Claims] 1. In a membrane key having a large keypad and a small keyband, contact electrodes each having an area approximately equal to the area of the large keypad are provided, and a spacer opening hole of a resin spacer is installed between the contact electrodes. A menglen key characterized by having a partition section that divides the.