Reflection photometric apparatus for camera including focal plan

Details Reflection photometric apparatus for camera including focal plan Reflection photometric apparatus for camera including focal plan

1980-07-21

1982-08-10

Hix, L. T.

354 60R, G03B 7081

Patent

active

043435416

ABSTRACT:
A reflection photometric apparatus for camera including focal plane shutter includes a photoelectric transducer element which determines reflected light from a first blind surface of a shutter and a film surface. A sample-and-hold circuit maintains an integrated voltage which is formed by an integration of a photometric output from the transducer element, and a summing amplifier circuit appropriately corrects the integrated voltage.

REFERENCES:
patent: 3994001 (1976-11-01), Maitani et al.
patent: 4159870 (1979-07-01), Corey et al.

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