Light-receiving device for use with the exposure meter in single

Details Light-receiving device for use with the exposure meter in single Light-receiving device for use with the exposure meter in single

1975-12-19

1977-10-11

O'Connor, Edna M.

354 59, G03B 1912

Patent

active

040539113

ABSTRACT:
In a single lens reflex camera having a metering device, a principal mirror is provided for reflecting part of the light passing through an objective lens toward a finder optical system and for transmitting therethrough the remainder of the light. First optical means including a reflector member are disposed between the principal mirror and photographic film in inclined relationship with the optical axis of the objective lens. A condensing mirror extends between the image of an object formed by the objective lens and the first optical means and the light-receiving portion of the metering device. An image-forming half-lens is provided on the condensing mirror to condense the image of the object toward the light-receiving portion by cooperating with the condensing mirror. The optical axis of the half-lens is substantially coincident with the reflecting surface of the condensing mirror.

REFERENCES:
patent: 3643575 (1972-02-01), Ono
patent: 3779146 (1973-12-01), Frankner
patent: 3842424 (1974-10-01), Tsunekawa

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