JPH0346429Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the improvement of a membrane switch, and in particular, a membrane switch that allows easy determination of suitable joining positions for top sheets, contact sheets, etc. that are stacked and arranged. It's about the switch.

[Prior Art] Conventional membrane switches generally have a rectangular shape consisting of a laminated base plate, a contact sheet with contact electrodes, and a top sheet with a large number of keys. In order to commercialize the parts, they were laminated and bonded based on the outer shape of the parts, and the peripheral edges were cut off to remove irregularities in the outer shape that occurred during bonding. However, in the case of conventional membrane switches, after laminating and bonding to improve the appearance, the periphery must be cut and finished, which requires additional work steps and reduces the quality of the product. In addition to being unable to achieve cost reduction, when laminating the base plate, contact sheet, and top sheet to be laminated, even if the outer shape is guided and positioned, misalignment between the layers tends to occur, and as a result, there is an effect between the upper and lower contact electrodes. However, even when the keys formed on the topsheet are pressed, the contact is unstable and poor contact occurs.

[Problems to be solved by the invention] Therefore, the present invention was devised to solve the above-mentioned problems, and its purpose is to facilitate assembly and improve workability. Another object of the present invention is to provide a membrane switch with high contact reliability.

[Means for Solving the Problems] The membrane switch according to the present invention has a key portion on its upper surface, a top sheet made of an insulating material, and a contact point having contact electrodes facing each other with a spacer interposed therebetween. A membrane switch comprising a sheet, wherein a plurality of protrusions each having a pin insertion hole for positioning extend from the outer periphery of the contact sheet, and a break line is carved at the base end of the protrusion. It is characterized by the fact that it was established.

In a preferred embodiment, the protruding pieces protrude from recesses formed at symmetrical positions on the left and right outer peripheries of the contact sheet.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

1 and 2, a membrane switch 1 according to the present invention is equipped with a top sheet 2 and a contact sheet 4. Among these, the top sheet 2 is formed of a laminated insulating material, and its upper surface is It has a key part 3 formed with several numbers, letters, etc. Further, the contact sheet 4 has a rectangular shape,
A contact electrode 5 is printed on its surface. Furthermore, a spacer 21 is inserted between the contact sheets 4, and the membrane switch 1 is formed in a layered manner as a whole (see FIG. 3).

A total of four projecting pieces 6, 6', 7, and 7' extend at symmetrical positions on the left and right outer peripheral edges of the contact sheet 4, two pieces each. That is, among these protruding pieces, the protruding pieces 6 and 7 and 6' and 7' are made to protrude in an overlapping position when the contact sheet 4 is folded back at the center. In addition, a jig 1 is attached to each protrusion 6, 6', 7, 7'.
Pin insertion holes 8, 8', through which pins 17, 18 standing up from above 6 are inserted to position the contact sheet 4;
9 and 9' are bored. Furthermore, these protrusions 6,
Breaking lines 10, 10', 11, 11' are cut at the base ends of the protrusions 6', 7, 7' for final separation of the projecting pieces. In addition to the perforation line (Fig. 4'), this break line may be a cut line, etc., and it goes without saying that any means that can remove the protrusion may be used. be. Also, these protrusions 6,
6', 7, 7' are recesses 12, 12', 13, 1 slightly wider than the width of each protruding piece to facilitate separation.
It is made to protrude from 3'. A connector portion 14 is formed to protrude approximately at the upper center of the contact sheet 4. As shown in FIG. 1, a base plate 23 is attached to the lower left side of the contact sheet 4, and a top sheet 2 is attached to the lower right side. Further, on the left side of the upper surface of this contact sheet 4, a spacer 21 having a plurality of small openings 22, 22, . . . is pasted.

Therefore, when assembling the membrane switch 1, the base plate 23 is first placed on the jig 16 with the pins 17 and 18 provided on the upper surface of the flat plate, and then the protrusions 6 and 7 are placed on the left side of the contact sheet 4. The provided pin insertion hole 8,
Insert the pins 17 and 18 through the holes 8'. After doing so, bend the contact sheet 4 from the center and insert the pins 17, 18 into the pin insertion holes 9, 9' of the right protrusions 6', 7'.
is inserted, set in such a state, each layer is pasted, and then the protrusions 6, 6', 7, 7' provided on the contact sheet 4 are aligned with the break lines 10, 10', 11,
11', the membrane switch according to the present invention can be easily assembled.

[Effects of the invention] Therefore, according to the invention, since the projecting piece provided with the pin insertion hole for positioning is extended to the outer periphery of the contact sheet, there is no misalignment when bonding each layer. A membrane switch with an excellent appearance can be easily provided, and since the contact sheet can be bent and positioned, misalignment between the key part on the top sheet and the contact electrode can be prevented, and a membrane switch with good contact can be obtained. Furthermore, assembly becomes extremely easy and production efficiency can be increased. Furthermore, since the entire surface of the attachment part can be pressed when assembled, there is no air bulge between the layers, and each layer can be attached evenly.
Furthermore, after assembly, the unnecessary protrusions can be easily removed, resulting in a membrane switch with a beautiful appearance.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the components of the membrane switch according to the present invention, FIG. 2 is a perspective view showing the membrane switch according to the present invention in the middle of assembly, and FIG. 3 is a perspective view after the assembly is completed. FIG. 4 is a plan view showing the main parts of the contact sheet, which is a component of the present invention.

Claims (1)

[Claims for Utility Model Registration] (1) A membrane switch having a key portion on its upper surface, a top sheet made of an insulating material, and a contact sheet having contact electrodes facing each other with a spacer interposed therebetween. A membrane characterized in that a plurality of projecting pieces each having a pin insertion hole for positioning extend from the outer periphery of the contact sheet, and a break line is carved at the base end of the projecting piece. Switch. (2) The membrane switch according to claim 1, wherein the protruding pieces protrude from defects formed at symmetrical positions on the left and right outer peripheries of the contact sheet.