| 摘要 |
A uniformly luminous EL sheet diaphragm and a lighted switch which is of a thin structure, provided with the EL sheet diaphragm, and used in input operating sections of various kinds of electronic devices are disclosed. A diffusion EL sheet comprises a transparent electrode (4) formed on a transparent film (3), a light emitting layer (5), a dielectric layer (6), a rear electrode layer (7) and an insulating layer (8). The EL sheet is formed so that the light emitting side is convex, thus fabricating a diaphragm part (2). A thin switch is produced by forming an electrode contact layer (9) on the insulating layer (8) on the concave side of the diaphragm (2) and an opposed electrode contact layer (11) on an insulating film base (10) opposing the layer (9). The tranparent electrode layer (4) is formed by printing and drying paste prepared by dispersing conductive powder having a visible light transmittance in an insulating resin. A high dielectric constant and flexible resin selected from vinylidene fluoride rubber, and a resin prepared by blending cyanated pullulan or cyanated cellulose and cyanated polyvinyl alcohol is used as the binder resin for the light emitting layer (5) and the dielectric layer (6). Therefore light emission failure due to wire disconnection in the diaphragm part (2) is prevented, providing a high quality EL sheet diaphragm and a switch using the diaphragm.
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