Illuminating device for an electric part

Details Illuminating device for an electric part Illuminating device for an electric part

1988-04-29

1989-02-21

Husar, Stephen F.

Illumination

Illuminated scale or dial

Internal light source

362 26, 362 29, 116286, G01D 1128

Patent

active

048070912

ABSTRACT:
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.

REFERENCES:
patent: 2885992 (1959-05-01), Roberts et al.
patent: 3574993 (1971-04-01), Black
patent: 4573106 (1986-02-01), Kuratani

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