Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy control of an electric discharge device in...
Patent
1978-11-01
1981-03-24
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy control of an electric discharge device in...
307117, 315159, 340148, 340326, 340628, H05B 3702
Patent
active
042582911
ABSTRACT:
A smoke alarm activated portable light or lamp for providing emergency illumination in response to an alarm signal from a smoke alarm device includes a frequency selective microphone, several amplifier stages, a peak detector, an isolation or buffer stage, and a power stage comprising a pair of cascaded transistors and a light bulb. The lamp includes a bracket for positioning same in proximity to a smoke alarm and a switch which is closed upon removal of the lamp from the bracket. A power saving circuit includes a photoelectric cell and an amplifier and is operative to saturate or overdrive the first gain stage to override any signal from the microphone whereby the lamp is rendered unresponsive to the smoke alarm signal upon illumination of the photocell by daylight or artificial light.
REFERENCES:
patent: 2608614 (1952-08-01), Williams
patent: 2931020 (1960-03-01), Bender
patent: 3286126 (1966-11-01), Crawford
patent: 3440347 (1969-04-01), Spencer et al.
patent: 3582671 (1971-06-01), Ott
patent: 3893081 (1975-07-01), Hopkins
patent: 4001805 (1977-01-01), Golbe
Craig Bryant F.
Scott Robert J.
LaRoche Eugene R.
Scott Robert J.
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