Exposure control device for photographic camera

Details Exposure control device for photographic camera Exposure control device for photographic camera

1979-04-26

1981-03-10

Hix, L. T.

354 24, 354 50, 354 60R, G03B 7093

Patent

active

042550270

ABSTRACT:
In a photographic camera provided with an electric shutter speed control circuit including a light measuring circuit in which scene brightness information is log-compressed and memorized by a memory circuit, the information is log-expanded by use of a decoder. A pulse generator is connected with a flip-flop group so that the pulses from the pulse generator are counted by the flip-flop group. The output of the flip-flop group is log-converted by a decoder connected therewith. The log-converted output of the decoder is compared with the output of the memory circuit by a comparator.

REFERENCES:
patent: 3824608 (1974-07-01), Toyoda
patent: 3863263 (1975-01-01), Itagaki
patent: 3899788 (1975-08-01), Toyoda
patent: 3921183 (1975-11-01), Toyoda
patent: 3995284 (1976-11-01), Kitaura
patent: 4015275 (1977-03-01), Bletz

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