Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Electric switch controlled by the radiant energy responsive...
Patent
1993-11-05
1995-02-28
Mis, David
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Electric switch controlled by the radiant energy responsive...
315 33, 315127, 250214P, 250214SW, 362 4, 362 9, H05B 3902, G03B 1500
Patent
active
053940636
ABSTRACT:
A reed switch is provided between a video camera and a battery pack circuit section. A current flowing when the video camera operates is detected by the reed switch. A video light is turned on or off on the basis of the detected current value. When the power source does not reach a specified voltage, the video light is turned off. The outer light amount when photographing is converted into an electric current by a phototransistor. When the current is less than a threshold level, the video light is lit or turned on. The threshold level is varied by a variable resistor.
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patent: 5075706 (1991-12-01), Miyazaki
patent: 5095408 (1992-03-01), Chen
Kananen Ronald P.
Mis David
Sony Corporation
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