Exposure control system with fill flash race condition

Details Exposure control system with fill flash race condition Exposure control system with fill flash race condition

1975-10-03

1977-05-10

Adams, Jr., Russell E.

354 32, 354 33, 354 34, 354 60F, G03B 716

Patent

active

040231879

ABSTRACT:
An artificial illumination control system is provided for a photographic camera for operation in a manner whereby under extremely low levels of ambient light intensity, the control system initiates the energization of a source of artificial illumination at a predetermined time period subsequent to the initiation of the exposure interval while under conditions of substantially higher levels of ambient light intensity, the control system initiates the energization of the source of artificial illumination as a consequence of the time integration of the scene light intensity incident to a photoresponsive element reaching a predetermined value. Hence, the artificial illumination control system may be automatically operated in both a normal flash mode and a "fill-in flash" mode.

REFERENCES:
patent: 3610122 (1971-10-01), Biber
patent: 3667357 (1972-06-01), Matsuda
patent: 3820128 (1974-06-01), Burgarella et al.
patent: 3836920 (1974-09-01), Uchiyama et al.
patent: 3855601 (1974-12-01), Uchiyama et al.
patent: 3942183 (1976-03-01), Whiteside

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