Illuminating device for an electric part,申请号US19880187826-传众专利搜索

Illuminating device for an electric part

申请公布号：US4807091(A)

申请号：US19880187826

申请日期：1988.04.29

申请公布日期：1989.02.21

申请人：

ALPS ELECTRIC CO., LTD.

发明人：OBATA, KOSEI

分类号：G09F13/04;H01H9/18;H01H19/02;(IPC1-7):G01D11/28

主分类号：G09F13/04

摘要：An illuminating device for an electric part which can illuminate a light conducting member uniformly with a simple construction. The illuminating device comprises an annular filter having a light passing zone and a light absorbing zone formed at different circumferential portions thereof. The filter is located on a lower face of and positionable in a circumferential direction relative to a cylindrical light conducting member which surrounds a manually operable knob mounted for rotation relative to an operation panel. A light source is located below the light conducting member so that light emitted from the light source is transmitted to an upper end face of the operation panel by way of the filter and the light conducting member. The distribution of the light passing zone and the light absorbing zone of the filter is selected suitably so as to attain desired uniform illumination at the upper end face of the operation panel.