Diaphragm control device for cameras

Details Diaphragm control device for cameras Diaphragm control device for cameras

1980-10-27

1981-09-08

Hix, L. T.

Optics: motion pictures

Removable film strip magazine type

354 42, 354 30, 352141, 250214P, G03B 7097

Patent

active

042881501

ABSTRACT:
A diaphragm control device of the type which performs TTL light measurement while stopping-down a diaphragm is constructed to automatically determine the diaphragm aperture by comparing an approximate signal with a reference signal to minimize the diaphragm aperture determination error caused when timewise variations are involved in the scene brightness. The approximate signal is generated by various circuits on the basis of a light measurement signal obtained by the TTL light measurement. The approximate signal varies approximately with the change in the diaphragm aperture due to the stopping-down operation of the diaphragm and coincides with the light measurement signal when no timewise variations are involved in the scene brightness.

REFERENCES:
patent: 3792485 (1974-02-01), Strauss
patent: 4104656 (1978-08-01), Strauss
patent: 4196989 (1980-04-01), Toyoda et al.

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