Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy control of an electric discharge device in...
Patent
1998-12-10
2000-12-12
Vu, David
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy control of an electric discharge device in...
315158, 315159, 250214AL, H05B 3702
Patent
active
06160352&
ABSTRACT:
An automatic switching device for flourescent light has a light sensing element that reacts to ambient light and a switching unit designed to react to an output signal from the light sensing element and to activate or deactivate the flourescent light. The switching unit has a reference threshold generator. The flourescent light is activated or deactivated depending on whether the output signal from the light sensing element exceeds or falls below a threshold generated by the reference threshold generator and the threshold level depends on the luminosity sensed by the light sensing element. The switching unit further includes a delay designed for preventing signal processing by the switching unit for a present period of time upon switching on of the flourescent light.
REFERENCES:
patent: 4281365 (1981-07-01), Elving et al.
patent: 4449074 (1984-05-01), Luchaco
patent: 5182502 (1993-01-01), Slotkowski et al.
patent: 5329206 (1994-07-01), Slotkowski et al.
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