Automatic diaphragm aperture control device for photographic cam

Details Automatic diaphragm aperture control device for photographic cam Automatic diaphragm aperture control device for photographic cam

1974-08-19

1976-04-20

Hix, L. T.

354 46, 354272, G03B 712, G03B 902

Patent

active

039523160

ABSTRACT:
In a photographic camera which controls a diaphragm aperture to an optimum aperture automatically, wherein the light from a photographic object which has been transmitted through an objective lens and a diaphragm aperture is measured by means of a light measuring device, as the diaphragm aperture for the objective lens, in its fully open condition is being stopped down from its fully open condition in association with the releasing operation of a shutter, the stop-down operation of the diaphragm aperture then being interrupted when the light measuring output becomes coincident with a value corresponding to a predetermined shutter speed, an improved automatic diaphragm aperture control device in which the movement of an interlocking pin for the objective lens in association with the operation of a diaphragm ring is transmitted to an operating lever within the body of a camera, which lever cooperates with the aforesaid operation of the diaphragm ring through the medium of a movement-enlarging mechanism which is adapted to enlarge the movement of the lever, as the diaphragm aperture is being stopped down, and then the aforesaid operating lever is locked by means of a locking pawl adapted to be operated by means of the aforesaid light measuring output, for controlling the diaphragm aperture.

REFERENCES:
patent: 3292516 (1966-12-01), Sato et al.
patent: 3393619 (1968-07-01), Albedyll et al.
patent: 3526174 (1970-09-01), Wagner

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