Camera auto sensing system for ISO speed

Details Camera auto sensing system for ISO speed Camera auto sensing system for ISO speed

1986-03-25

1988-01-05

Adams, Russell E.

354482, G03B 724

Patent

active

047179295

ABSTRACT:
In order to make possible the automatic setting of the sensitivity of a film to be used in an exposure controlling system by a simplified structure manufacturable at a low cost, the camera auto sensing system for ISO speed comprises: a pair of switches rendered to either a conductive state or a non-conductive state by judging a digital pattern indicative of the film sensitivities provided on a film cartridge mounted in a camera; a pair of electromagnets connected to respective switches; a film sensitivity changing lever coupled to the armatures of the respective electromagnets so as to be allowed to be moved to four positions in accordance with the operative state and the non-operative state of the respective electromagnets; and light amount changing means coupled to the film sensitivity changing lever to change the amount of light incident to an exposure-controlling light-receiving device in accordance with the movement of the changing lever. Thus, in this system, the sensitivity of the film to be used is sensed and set to the exposure-controlling system at each shutter release.

REFERENCES:
patent: 3601025 (1971-08-01), Stieringer
patent: 4074286 (1978-02-01), Suzuki

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