Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Plural radiant energy responsive devices
Patent
1979-08-02
1981-07-07
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Plural radiant energy responsive devices
250221, 250209, 315159, 340556, H05B 3702
Patent
active
042777275
ABSTRACT:
A digital room light controller comprising optical emitters--sensors, a digital up/down counter, associated transistor--transistor logic(TTL) and solid state relay(SSR) has been constructed. The combination of optical emitters--sensors, TTL logic, up/down counter and SSR, which, when positioned in a doorway of a room, will maintain an electric light bulb in an on or off state depending on the accumulated count in the counter. The digital light controller increments the total count by +1 (i.e. counts up) in the counter when the room is entered and increments the count by -1 (i.e. counts down) when an exit is made from the room. A count of zero causes the interruption of electric power at a selected light fixture, while a non-zero count in the counter insures the maintenance of electric power at the fixture. Therefore a room light is maintained in an off state when the room is not in use.
REFERENCES:
patent: 2047665 (1936-07-01), Beggs
patent: 2065048 (1936-12-01), Burnside
patent: 4009389 (1977-02-01), Lindholm
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