Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Plural load devices
Patent
1985-01-07
1986-12-16
Chatmon, Saxfield
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Plural load devices
315155, 315156, 315159, 250206, H05B 3702, H05B 3904, H05B 4136
Patent
active
046299416
ABSTRACT:
A first phototransistor (20, 20') is mounted on the structure such as a home (12) or a garage (14) to sense the level of ambient illumination. A second phototransistor (22, 22') senses both the level of ambient illumination and illumination from the headlights of an approaching vehicle or the like. The phototransistors are arranged with a pair of resistors (54, 56) in a balanced bridge (50). A central bridge junction (52) assumes a higher potential when both phototransistors are illuminated the same, whether light or dark, and a lower potential when the second phototransistor is illuminated more brightly than the first. In response to the uneven illumination of the phototransistors, a timer (60) produces an output signal for a preselected duration. An optic coupler (90) gates a triac (92) conductive for the preselected duration of the timer. The triac is connected in series with exterior security lights (24, 24') for illuminating the area adjacent a driveway, home, and garage to provide a lighted path for the vehicle occupant after disembarkation of the vehicle.
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"Light-Operated Bistable Switch" by David C. Conner Mar. 1971 Popular Electronics, p. 70.
"Automatische Hofbeleuchtungsanlage" by Die Schaltung Dec. 1978 Funkschau, pp. 1301-1302.
Ellis Edward H.
Ellis Marilyn S.
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