Aperture device for zoom lens

Details Aperture device for zoom lens Aperture device for zoom lens

1984-11-27

1987-01-13

Corbin, John K.

354274, G02B 1500

Patent

active

046360417

ABSTRACT:
The aperture of a zoom lens is varied automatically during zooming by an aperture drive device that includes a pair of drive members rotatable about the optical axis. Each drive member has an arm member that engages a coupling member on a rocking member pivoted about an axis perpendicular to the optical axis. During an aperture closing operation the coupling member and the arm members move relatively along the optical axis. Initially, both drive members rotate together, such that the aperture does not change, but then the drive members rotate relatively to vary the aperture.

REFERENCES:
patent: 4141636 (1979-02-01), Shiniojima
patent: 4264178 (1981-04-01), Muryoi
patent: 4473278 (1984-09-01), Hana

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