Electronic trim control for dual-photodetector exposure control

Details Electronic trim control for dual-photodetector exposure control Electronic trim control for dual-photodetector exposure control

1985-08-09

1988-01-05

Adams, Russell E.

354420, 354483, G03B 1505

Patent

active

047179350

ABSTRACT:
A photographic camera of the type having a quench-type strobe, a scanning blade shutter and an exposure control system having separate ambient and artificial light sensing devices for establishing distinct signals representative of the amount of ambient and artificial light illuminating a particular scene, is provided with a unitary, manually operable electronic trim control for simultaneously varying both of these signals, to a limited degree, to compensate for variations in ambient scene lighting conditions and/or slight variations in the sensitometric characteristics of a photographic film. The electronic trim control system includes a common voltage source capable of providing a plurality of different magnitude trim voltages for regulating both ambient and artificial scene light levels. The electronic trim control couples a manually selected common trim voltage corresponding to desired ambient and artificial scene light levels to shutter and strobe control circuitry for ambient and strobe light control purposes.

REFERENCES:
patent: 3620143 (1971-11-01), Burgarella
patent: 3942183 (1976-03-01), Whiteside
patent: 4023187 (1977-05-01), Shenk
patent: 4199244 (1980-04-01), Shenk
patent: 4199246 (1980-04-01), Muggli
patent: 4209243 (1980-06-01), Johnson et al.
patent: 4255030 (1981-03-01), Johnson et al.
patent: 4279487 (1981-07-01), Baker et al.
patent: 4384773 (1983-05-01), Hambly
patent: 4445763 (1984-05-01), Whiteside

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