Illumination device for a knob of a switch

Abstract

A movable member 4 is slidably mounted within a space 3 formed by a first fix member 1 and a second fix member 2 composing a case. The movable member 4 is made of a white type resin, such as polyacetal, and composed of a column-shaped extended section 4a extending frontwardly for being pulled from and inserted into the space 3, a bottom wall 4h and side walls 4d, 4d extending from the extended a section 4a rearwardly, and a rear wall 4p coupled with the bottom wall 4h and the side walls 4d, 4d. The extended section 4a is fixed with a knob 5. The second fix member 2 forms a lamp base 2c loading light sources 9 and 10. A displaying section 5b, such as a display mark and characters, is provided on the knob 5, and a displaying member 15 made of a transparent resin with white color, such as a heat-resistance acrylic, is embedded in the displaying section 5b at the back surface of the knob 5. The knob 5 has a column-shaped section 15a extending until the portion adjacent to contact holes 5a, wherein the end point of the extended section 4a of the movable member 4 is contacted to the end point of the column-shaped section 15a when the movable member 4 is assembled. According to the present invention, there is presented an illumination device for illuminating the knob of a switch which provides easy observation of the displaying section, a sufficient luminance, less expense, and good productivity.