Circuit layout to measure exposure times and/or to control the t

Details Circuit layout to measure exposure times and/or to control the t Circuit layout to measure exposure times and/or to control the t

1979-07-05

1981-12-01

Miller, Jr., George H.

354 51, 354 60A, 354 60L, G03B 7093, G03B 1718, G01J 146

Patent

active

043033172

ABSTRACT:
Apparatus for measurement of the exposure time and/or for controlling the time for exposure of a photographic camera having a measuring unit generating an exposure time signal in response to object brightness. The apparatus comprises an oscillator, a frequency transforming device, a comparator means and a display means. The frequency transforming device generates output signals offset in frequency with respect to one another, and these output signals define an elapsed time which is compared in the comparator means with the exposure time. The display means are connected to the comparator means for indicating the results of the comparison.

REFERENCES:
patent: 3592113 (1971-07-01), Wasielewski
patent: 3849786 (1974-11-01), Nanba et al.
patent: 3909137 (1975-09-01), Kisanuki
patent: 4003063 (1977-01-01), Takahashi
patent: 4015275 (1977-03-01), Bletz
patent: 4089012 (1978-05-01), Kawasaki

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