TTL metering device in a single lens reflex camera

Details TTL metering device in a single lens reflex camera TTL metering device in a single lens reflex camera

1978-03-28

1979-11-20

Adams, Russell E.

354152, 354227, G03B 700

Patent

active

041748948

ABSTRACT:
A TTL metering device in a single lens reflex camera for measuring light passed through the picture-taking objective lens of the camera comprises a light-sensing element for receiving the light passed through the picture-taking objective lens to produce an output corresponding to the intensity of the light, a jump-up mirror having a light-transmitting area through which the light may be transmitted, and diffusion means for permitting the light transmitted through the light-transmitting area of the jump-up mirror to reach the light-sensing element.

REFERENCES:
patent: 3332330 (1967-07-01), Broschke et al.
patent: 3429246 (1969-02-01), Ebertz
patent: 3468233 (1969-09-01), Schmidt
patent: 3523497 (1970-08-01), Holle
patent: 3540363 (1970-11-01), Ono
patent: 3559551 (1971-02-01), Ono
patent: 3699864 (1972-10-01), Shimomura
patent: 3779146 (1973-12-01), Trankner
patent: 3994001 (1976-11-01), Maitani et al.

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