Television – Video display – Cathode-ray tube
Patent
1994-05-13
1996-02-27
Coles, Sr., Edward L.
Television
Video display
Cathode-ray tube
348818, 348820, 348143, 348155, 340567, 340573, H04N 564, G08B 1318, G08B 2300
Patent
active
054953022
ABSTRACT:
A television receiver radiation exposure limiting apparatus including a power supply, a proximity sensor, a rf switch, and a housing wherein the apparatus may be located within a small housing emplaced on the television receiver. The preferred proximity sensor comprises a monostatic infrared type sensor and responds to the comparative infrared signature of a human referenced to the ambient background. The sensor generates an electrical output signal which either stimulates or terminates conduction of electric current in an rf relay or solid state switch whenever a human form is within a preset detection range. A system in which the sensor signal terminates current flow is preferred. The rf relay or solid state switch connects the incoming rf signals representing unprocessed video and audio information to the VHF/UHF input of the television receiver only when no human signature is detected by the proximity sensor.
REFERENCES:
patent: 4321593 (1982-03-01), Ho et al.
patent: 4417278 (1983-11-01), Hensleigh et al.
patent: 4716469 (1987-12-01), Kim et al.
patent: 4831448 (1989-05-01), Park
patent: 4835614 (1989-05-01), Ryu
Coles Sr. Edward L.
Esposo Allan A.
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