Exposure measuring apparatus for photographic cameras

Details Exposure measuring apparatus for photographic cameras Exposure measuring apparatus for photographic cameras

1978-01-23

1979-10-30

Gonzales, John

354 56, 354 59, G03B 708

Patent

active

041726430

ABSTRACT:
The invention relates to an apparatus for internal measurement of the exposure in photographic cameras where the light penetrating the picture-taking or objective lens is fed by way of a mirror to a photoelectric cell.
A marginal reflective surface faces the objective lens and surrounds a picture window adjacent the film surface. The marginal surface is formed as a concave mirror the optical axis of which is inclined to the optical axis of the objective lens so as to reflect part of the light therefrom to the photoelectric cell.

REFERENCES:
patent: 3523497 (1970-08-01), Holle
patent: 3864699 (1975-02-01), Tsunekawa et al.

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