Video lighthead with dimmer control and stabilized intensity

Details Video lighthead with dimmer control and stabilized intensity Video lighthead with dimmer control and stabilized intensity

1997-12-12

1999-11-30

Wong, Don

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315158, 315224, 362 4, G03B 1502, G01J 132

Patent

active

059948442

ABSTRACT:
A video lighthead mountable to a video camera and having a dimmer control that varies the intensity of the light output from the lighthead using pulse width modulation techniques. A photo sensor measures the intensity of light reflected from a subject in front of the lighthead. The intensity of light output from the lighthead is adjusted by control circuitry in response to changes in measured reflected light intensity to maintain a constant level of illumination. The adjustment is carried out by modifying the duty cycle of a pulse width modulation circuit. The duty cycle adjustment of the pulse width modulation is also used to compensate for supply voltage variations in order to maintain constant light output.

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patent: 5146153 (1992-09-01), Luchaco et al.
patent: 5467152 (1995-11-01), Wilson et al.
patent: 5747938 (1998-05-01), Beard

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