EL sheet and component for lighting type push-button switch

Abstract

It is to provide an EL sheet and a member for lighting a push-button switch capable of emitting light stably and sufficiently for a long period of time without problems such as non-light emission phenomena and generation of black dot, even if the EL element is subjected to, for example, a drawing process to form into a three-dimensional shape. A laminated EL sheet is formed that comprises a counter electrode layer 15, a dielectric layer 14, a light-emitting layer 13, and a transparent electrode layer 11. An adhesive layer 12 made of adhesive having excellent adhesiveness to the electroconductive polymer is disposed between the transparent electrode layer 11 made of an electroconductive polymer and the light-emitting layer 13. In order that the adhesives have excellent adhesiveness, polyester, acrylic, cyanoacrylate, polyolefin, ethylene-vinyl acetate or ethylene ethyl acrylate type adhesive is used. The dielectric layer is made of fluoro type, polyester type or acrylic type resin binder. Furthermore, to improve durability in a hot and high-humidity environment, a second counter electrode layer 17 and / or a second dielectric layer 17, both having an ion diffusion-preventing function is / are disposed.

Description

technical field [0001] The present invention relates to a member for an illuminated push button switch or an EL sheet used for a member for an illuminated push button switch of a small electric and electronic device, wherein the small electric and electronic device is mounted on a mobile communication device such as a mobile phone, a PDA, and a CD player or an MD player , a compact tape recorder, or in a car. Background technique [0002] Conventionally, illuminated push button switches have been used in input devices such as mobile communication devices. Among the illuminated pushbutton switch members used in the pushbutton switches of such input devices, a so-called light-emitting function for illuminating the function display portion of the pushbutton switch during use at night is widely used. [0003] figure 2 An example of a conventional illuminated push button switch is shown. For example, as figure 2 As shown, in the state where the cover base material 32 and the ...

AI Technical Summary

Problems solved by technology

[0014] In addition, in the EL sheet used in conventional push button switch components, as the driving time, that is, the luminescence time of the EL sheet, ions are generated in the metal filler of the counter electrode layer and impurities mainly composed of bromine and chlorine in the transparent electrode layer. As a result, the insulation between the transparent electrode layer and the back electrode layer is degraded, resulting in a decrease in luminance, a partial short circuit, and thus the occurrence of black spots, which in turn cause no light. abnormal situation

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