JPS58129713A - 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 membrane key has a plurality of key pads 2.3 stamped 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.

Flexible polyester finger 4 with B printed on it, flexible polyester with ■ bars A/ and B/ printed on the top for contact, I@resin 5, and this 1 bottom with 1 A resin spacer 8 is inserted between the polyester resins A and 5 forming a pair of facing electrodes, and has an opening hole 6.7 for always forming a gap between the electrodes A and A' and between B and B'. , a reinforcing plate 9 made of a resin plate or an insulating coated metal plate is provided on the F part of the flexible polyester resin 5 to reinforce the constituent parts; 8 is also used to insulate the 'rtUi section for other wiring.
'l' was in trouble.

In the above conventional example, the area of the large keypad 2 corresponding to the ``start'' key and ``stop'' key, which are relatively frequently used in the operation of electrical equipment such as microwave ovens, is changed to correspond to a normal 1-numeric key. It is approximately four times larger than the area of the small keypad 3, and the spacer opening 6 of the resin spacer 8 corresponding to the keypad 2 is opened to avoid a difference in pressing force with the small key. Since the length a of the short side of the key pad 3 was made to be approximately the same as the length 1) of one side of the spacer aperture 7 corresponding to the large keypad 3, the aperture 6 had an elongated rectangular shape. Therefore, there is a large discrepancy between the display area of the operating area of the dog-shaped keypad 2 and the opening area of the spacer (21 holes, 60 areas) corresponding to the actual operating area, which makes the user feel uncomfortable and also There were problems such as inducing human error.

Furthermore, when the opening holes 6 and 7 are set for the large keypad 2 and small keypad 3 according to their respective display sizes, the surface transparent rod 1 fat 1, the polynisdel antifat 4 and 5, and the If the thickness and material of 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 even the slightest touch of a key may cause erroneous inputs. On the other hand, if the material of the membrane is selected based on the depressed state of the large keypad 2, there is a drawback that normal input cannot be performed unless the pressure of the small keypad 3 is increased.

In order to achieve the object described above, the present invention provides a membrane key having a doll keypad and a small keypad, each of which is provided with a contact electrode having an area approximately equal to the area of the large keypad. At the same time, a spacer is installed between the gaps, and the reinforcing plate is attached to the Y part of the membrane key. It is characterized by the formation of small protrusions.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 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 and c' are contact electrodes of the large keypad 2 corresponding to the "Start" key and the "Stop-1 key,"6' is an opening formed in the resin spacer 8, and 2. Area of the large keypad 2. The above contact electrodes c and c are approximately equal to
The area of ' is also approximately equal to -1 - the area of the enlarged keypad 2 1
．． stomach. ]0 is a small protrusion formed by injection molding or press molding on the reinforcing plate 9 of the membrane key installed at the bottom of the electrode C', and its height is equal to that of the resin spacer. The thickness is approximately equal to the thickness of the polyester resin 5 on which the second contact electrode C' is provided.

5' is a through hole formed approximately at the center of the contact electrode C' of the Borien del resin 5, through which the small protrusion 10 is inserted. Providing the small protrusion 10 on the reinforcing plate 9 of the membrane key in this way is equivalent to forming a small-area insulating spacer approximately in the center of the resin spacer 8, and the distance between the contact electrodes c and c' is It is possible to obtain the effect of maintaining a predetermined spacing so that they are extremely close to each other.

Therefore, key operations can be reliably performed with the same pressing force as when pressing the small keypad 3.

As explained above, the present invention provides a membrane key having a large keypad and a small keypad, in which the area of the large keypad is approximately equal to the area of the large keypad.1. A resin spacer is installed between the V resins, and a reinforcing plate is installed at the bottom of the membrane key. , Forming a small protrusion to be inserted into the open hole 1. treasure,
The same effect as the short side of the spacer opening [] hole can be obtained, and by increasing the key pressing force, the compression difference with the small key band can be reduced. This is an application that allows key operations with approximately the same pressing force even with 2 models, and there is no discomfort in key operations when using a membrane key with a mixture of a large keypad and a small keypad, and signals can be reliably input from the keypad. It can be wide-ranging.

[Brief explanation of the drawing]

Figure 1 shows the disassembly of a conventional membrane key. FIG. 2 is an exploded perspective view of a membrane key showing an embodiment of the present invention.

Claims (1)

[Claims] 1. In a membrane key having a large keypad and a small keypad, a contact electrode having an area approximately equal to the area of the large keyband is provided, a resin spacer is provided between the polyester resin provided thereon, and the membrane key is provided with a resin spacer. A membrane key characterized in that a reinforcing plate attached to a lower part of the key is provided with a small protrusion that is inserted into a through hole provided approximately at the center of the contact electrode.