Illumination – Illuminated scale or dial – Illuminated through meter case
Patent
1984-08-01
1986-02-25
Nelson, Peter A.
Illumination
Illuminated scale or dial
Illuminated through meter case
362 30, 362278, 362800, 338 74, 338154, G01D 1128
Patent
active
045731063
ABSTRACT:
A slide rheostat having a light-emitting device for permitting a person to check the position of the knob of the rheostat in the nighttime or in the dark. The rheostat includes a transparent upper baseplate, a transparent lower baseplate, a laminated sheet including a pressure-sensitive contact member, a transparent sliding body that reciprocates, the knob being formed on the sliding body, an indicator portion having a transparent region, and a pressure-applying member. The light-emitting device is disposed below the lower baseplate rather than on the knob carried by the sliding body. When the light-emitting device is lit, the emitted light is transmitted through the lower baseplate, the laminated sheet, the upper baseplate, and the transparent region of the indicator portion that has a scale thereon. Part of the light directly reaches the outside through this transparent region, while the other part arrives at the outside after passing through the knob.
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Alps Electric Co. ,Ltd.
Nelson Peter A.
Shoup Guy W.
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