Drive control of zoom lens in zooming system

Details Drive control of zoom lens in zooming system Drive control of zoom lens in zooming system

1987-12-28

1989-06-20

Arnold, Bruce Y.

354402, G02B 1500

Patent

active

048404705

ABSTRACT:
An optical zooming system comprising a zoom lens device for varying the focal length of the zooming system by its own movement in directions of the optical axis thereof and a cylindrical cam device arranged to encase the zoom lens. The zoom lens device has an engaging pin at its peripheral surface which is engaged with a cam groove formed at the inner circumferential surface of the cylindrical cam device to be movable along the cam groove. The cylindrical cam device is coupled to a drive device to be rotated so that the zoom lens device is moved in the optical axis directions in response to the rotation of the cylindrical cam device. The cam groove has a configuration formed so that the focal length of the zooming system is varied in linear relationship to the angle of rotation of the cylindrical cam device.

REFERENCES:
patent: 3522981 (1970-08-01), Kirstein et al.
patent: 3680459 (1972-08-01), Okura
patent: 3840291 (1974-10-01), Littmann et al.
patent: 4623226 (1986-11-01), Fujii
patent: 4687303 (1987-08-01), Takahashi et al.

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