Automatic aperture control device

Details Automatic aperture control device Automatic aperture control device

1979-10-31

1981-06-09

Griffin, Donald A.

G03B 906

Patent

active

042721750

ABSTRACT:
An automatic aperture control device adapted to be fitted in a lens barrel of an automatic aperture control camera in which the aperture value is controlled in accordance with the stop position of the camera. Pairs of aperture blades and intermediate levers are pivotally mounted on a support ring with a first drive shaft of each intermediate lever mounted in a corresponding aperture of an opening and closing ring and a second drive shaft of each intermediate levers slidably mounted in an elongated groove formed in a corresponding aperture plate. The elongated groove is formed such that the amount of variation of an outer radius of the aperture blade is minimized with a result that smooth and precise aperture control is achieved over the entire range of aperture values.

REFERENCES:
patent: 3055282 (1962-09-01), Baur et al.
patent: 3631787 (1972-01-01), Shimizu
patent: 3668995 (1972-06-01), Bardutzky
patent: 3687047 (1972-08-01), Ito

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