Automatic battery powered video light

Details Automatic battery powered video light Automatic battery powered video light

1989-02-13

1990-09-25

Hart, Douglas

Illumination

Photographic lighting

Light responsive

250205, 315151, 315153, 315158, 315241S, 315291, 315307, 354413, 362 5, 362276, G03B 1502, G01J 132, G05F 100, H05B 3904

Patent

active

049597558

ABSTRACT:
An automatic battery powered video light (10) is supplied power by a d.c. battery (16). A light (20) is connected between a first terminal of the battery (16) and a MOSFET switch (46), which is connected to a second terminal of the battery (16). A control circuit (24) controls the opening and closing of the MOSFET (46) to supply power to the light (20) and disconnect power from the light (20). The control circuit (24) includes a light sensor (36) for sensing ambient light and reflected radiant light from a scene (14) and a pulse width modulator (40) for controlling the MOSFET switch (46). The modulator (40) increases pulse width and therefore closing time of the switch (46) when the sensor (36) senses time low light levels, and vice versa. Also provided is a dual filament light (20') wherein each filament (52, 54) is independently controlled to enhance color balance.

REFERENCES:
patent: 2757274 (1956-07-01), Myers
patent: 3002099 (1961-09-01), Gregory
patent: 3177397 (1965-04-01), Keeran
patent: 3456155 (1969-07-01), Buchanan
patent: 3473084 (1969-10-01), Dodge
patent: 3488434 (1970-01-01), Farber
patent: 3898512 (1975-08-01), Buck
patent: 4368406 (1983-01-01), Kruzich
patent: 4464606 (1984-08-01), Kane
patent: 4634933 (1987-01-01), Kamon et al.
patent: 4682084 (1987-07-01), Kuhnel
patent: 4808809 (1989-02-01), Hayakawa

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