JPS5944723A - Film switch - 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 Technical Field The present invention relates to a membrane switch formed by laminating a flexible sheet, a switch/edge contact group, and a light emitting layer made of an organic J/R7.1 mineral material.

<Prior Art> As an example of this type of device, there is a membrane switch shown in FIG. 6 of Japanese Patent Application No. 5Ei-57438 filed on April 15, 1980 by Mokuyo. FIG. 1 shows such a membrane switch <1). This membrane switch (1) is a stack of a switch section (2) and a light emitting section (3). The switch part (2) is connected to the first flexible seats 1 to (4) and the first flexible seats (4).
) The first contact point (5) arranged on the surface, the first contact point (5) on the surface, the first sheet (4)
) second flexible seams 1 to (7) arranged on the surface side through the flexible sears (6), the first contact point (5)
) and a second contact point 8) disposed on a second sheet (7) facing the pair of first and second contacts (5) (8).
The switch contact group (9) consisting of the above spacer (6
) formed by the first tot (4) and the second tot (7
) can be placed within the space. In addition, the light emitting part (3) includes a back electrode (10) arranged on the front side of the second sheet (7), and a reflective insulating layer laminated sequentially on the second sheet (10) to (7) surface side.
) and a light-emitting layer (12), and a third flexible sheet (14) on which a surface electrode (13) is formed at a position opposite to the back surface electrode (10) laminated on the light-emitting layer; The third sheet (14) becomes the top sheet.

1-Distribution The first to third sheets (4), (7), and (14) and the spacer (6) may be made of Mylar film, and at least the 37th sheet (<14) is transparent. Further, the first and second contacts (8) and the back electrode (10) are made of copper foil, and the front electrode (13) is made of a transparent conductive film such as Nesa film.

Furthermore, the reflective insulating layer (11) is made of a white high dielectric material such as barium titanate, and the light emitting layer (12) is made of a mixed film of styrene resin, zinc sulfide, etc. . The light emitting section (12) applies an alternating current electric field between the front electrode (13) and the back electrode (10), as is known from the March 1981 issue of Denshi/Technology, page 90. This causes the light emitting layer (12) to emit light.

In addition, the first and second contacts (5) and (8), the surface electrode (13
) and the back electrode (10) are connected to external lead terminals (not shown).

In the membrane switch (1) that refuses, by pressing the third seam (14) directly above the switch contact group (9), the first and second contacts (ri) (8) can be brought into contact with the phase σ. As described above, by applying an alternating current voltage between the back electrode (10) and the front electrode (13), light is generated in the light emitting layer (12), and the light that is rejected is transferred to the front electrode (13), the 37th-). (14) and is radiated to the outside.

Further, as shown in FIG. 1, when the light emitting part (12) is located directly above the switch contact group (9), the light emitting layer (12) directly above the contact group (9), which is referred to as the switch contact group (9), The operation of the contact group (9) is controlled by the light emitting layer (12).
It may also be possible to confirm this by emitting light. still,
The circuits included in such a configuration can be arbitrarily configured using well-known techniques, so a description thereof will be omitted.

<Problems with the prior art> Normally, in the above membrane swing (1), the switch contact group (
The operating voltage of 9) is 5 to 30 VDC, and the light emitting part (
3) Operating voltage is loVAC or higher, frequency 400 Hz
degree is necessary. , - When an AC voltage is applied to the light emitting part (3), an induced voltage is generated in the switch contact group (9) close to the light emitting part (3), and the induced voltage causes the first and second contacts to (5) and (8) have the problem of being in a state as if they were being pressed even though they are not in contact.

<Objects and Summary of the Invention> The present invention has been made in view of the above-mentioned problems, and the membrane switch of the present invention is arranged in a laminated manner with the flexoprus sheet I arranged on the surface, and the membrane switch of the above-mentioned sheet 1. A switch section having a group of contacts that come into contact when not pressed, and a light-emitting layer made of an electroluminescent material that emits light when an electric field is applied are laminated together, and a dielectric layer is disposed between the switch section and the light-emitting layer. The purpose is to prevent induced voltage from being generated in the switch section when the light emitting section is operated.

<Example> Figure 2 shows a membrane switch (IA) according to an embodiment of the present invention.
゜The same parts as in Figure 1 are given the same numbers.

The difference from the conventional switch (1) in Figure 1 is that the second switch + (
7) with a conductive layer (21) inserted therein.
The flexible sheets (22) and (23) were used. The fourth and fifth sheets (22) (23) may be made of mylar film, for example, like the first and third sheets (4) and (14), and the conductive layer 21) may be made of copper foil, etc. Can be configured. Although not shown, one end of the conductive layer (21>) is grounded.

With this configuration, even if an alternating current voltage is applied to the light emitting section (3), induced voltage is generated only in the conductive layer (21), and the switch section (2) does not malfunction.

Figure 3 shows another example membrane swig (IB).
The difference from the embodiment is Switch '81! (2) and the light emitting part (
3) has been reversed in position. In other words, ``83
A switch part (2) is inserted between the sheet (14) and the fourth seam h (22), and a light emitting part (3) is inserted between the fifth seam-1 to (23) and the first sheet (4). ) was inserted.

When constructed in this way, the light emitted from the light emitting layer (12) is extracted from the third seam]・(14) surface of the light emitting layer (12).
Each layer located in the F section must be made of transparent material 4. Therefore, in this embodiment, the third to fifth notes (14>(22
) (23) was made of a transparent Mylar film, and the first and second contacts (5), (8) and the conductive layer (21) were made of a transparent conductive material such as Nesa film.

FIG. 4 shows an embodiment of a method for grounding the conductive layer (21) of the membrane switch (IB). Note that the same parts as in FIG. 3 are given the same numbers.

Normally, in order to attach a membrane switch to a device, first fix the first sheet (4) side of the membrane switch 3) to the metal substrate (31) 1, and then attach the substrate (31) side to the device. -shi (3
2) is fixed. Further, the soybean (32) is made of metal and is grounded. In this embodiment, focusing on this point, one end of the conductive layer (21) is connected to the substrate (31).
and the chassis (32).

This eliminates the need for a lead wire or the like connected to the conductive layer (21) for grounding, leading to a reduction in the number of parts.

Also in the second and third embodiments, since the grounded conductive layer (21) is present between the switch section (2) and the light emitting section (3), the switch section is closed when the light emitting section 3) is operated. (
2) No induced voltage occurs.

<Effects> As is clear from the above explanation, in the membrane switch of the present invention, although the light-emitting layer made of an electroluminescent material that can be driven by AC and the switch portion are disposed close to each other, when the light-emitting layer is operated, the switch portion There is no induced voltage and high reliability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, and FIGS. 2 to 4 are sectional views showing embodiments of the present invention. (2) Switch part, (9>...Switch contact group, (12)...Light emitting layer, (21) Conductive layer.

Claims (1)

[Claims] (1) A flexible sheet arranged on the surface, a switch section equipped with a group of contacts that are spaced apart at a predetermined interval when the sheet is not pressed and come into contact with each other when pressed, and an electroluminescent material that emits light when an electric field is applied. A membrane switch formed by laminating a light-emitting layer and a light-emitting layer, characterized in that a conductive layer is disposed between the switch part and the light-emitting layer. 2. The membrane switch according to claim 1, wherein the conductive layer is grounded.