Control knob dial illumination

Details Control knob dial illumination Control knob dial illumination

1994-09-13

1996-10-15

Gromada, Denise L.

Illumination

Illuminated scale or dial

362 5, 362 84, 116310, 116DIG35, G01D 1128

Patent

active

055648126

ABSTRACT:
A device for backlighting a plastic panel associated with a control knob and carrying indicia thereon for illumination by an electroluminescent panel under the plastic panel containing the indicia with the electronic circuitry for illuminating the electroluminescent panel being contained within the hollow control knob. A light-responsive device may be used to maintain the circuit in the OFF position until the ambient light intensity fails below a predetermined level.

REFERENCES:
patent: Re24999 (1961-06-01), Kirsten
patent: 3069509 (1962-12-01), Sharron
patent: 3254534 (1966-06-01), Graham
patent: 3738239 (1973-06-01), Higuchi
patent: 4172333 (1979-10-01), Towsend
patent: 4895455 (1990-01-01), Horning
patent: 5005306 (1991-04-01), Kinstler
patent: 5339550 (1994-08-01), Hoffman

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