Control knob dial illumination

Details Control knob dial illumination Control knob dial illumination

1997-03-18

1998-12-01

Sember, Thomas M.

Illumination

Illuminated scale or dial

362 84, 116310, 116DIG35, G01D 1128

Patent

active

058427643

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 falls below a predetermined level.

REFERENCES:
patent: Re24999 (1961-06-01), Kirsten
patent: 3069509 (1962-12-01), Sherron
patent: 3254534 (1966-06-01), Graham
patent: 4895455 (1990-01-01), Horning
patent: 5564812 (1996-10-01), Berardi

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