Exposure control apparatus including rate responsive lag compens

Details Exposure control apparatus including rate responsive lag compens Exposure control apparatus including rate responsive lag compens

1978-02-02

1979-04-24

Gellner, Michael L.

354;60F;128;139, G03B 708, G03B 1503

Patent

active

041508912

ABSTRACT:
An exposure control circuit of the type adapted to produce an exposure termination signal after a time interval related to a time integral of light intensity. The control circuit includes lag compensation means responsive to the light intensity at the time the exposure termination signal is produced, or responsive to a change in light intensity from the beginning of exposure measurement to the time the exposure termination signal is produced, to adjust the time interval to compensate for lag. The control circuit further includes improved lag compensation means responsive to the time rate of change of light intensity at the time that the exposure termination signal is produced for further adjusting the time interval to thereby provide improved lag compensation.

REFERENCES:
patent: 3200723 (1965-08-01), Topaz
patent: 3519879 (1970-07-01), Ogawa
patent: 3737721 (1973-06-01), Ogawa
patent: 4019092 (1977-04-01), Stiller
patent: 4033682 (1977-07-01), Nakamura et al.
patent: 4034383 (1977-07-01), Mashimo et al.
patent: 4057811 (1977-11-01), Harrison
patent: 4058818 (1977-11-01), Johnson et al.

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