Zoom lens with inner or rear focusing system

Details Zoom lens with inner or rear focusing system Zoom lens with inner or rear focusing system

1988-06-03

1990-10-16

Sugarman, Scott J.

G02B 1514

Patent

active

049630067

ABSTRACT:
A zoom lens includes a plurality of lens units movable along the optic axis, and a mechanism for prescribing the movements of the plurality of lens units along the optic axis and making the focal length of the zoom lens adjustable within a desired range. At least one of the plurality of lens units is moved along the optic axis to form the image of an obect lying at any distance from the zoom lens on a predetermined surface. The mechanism has a member formed with at least one slot which prescribes the movement of the at least one lens unit along the optic axis. The at least one lens unit is moved in accordance with the at least one slot both when it is moved along the optic axis to change the focal length of the zoom lens and when it is moved along the optic axis to form the image of the object on the predetermined surface.

REFERENCES:
patent: 4627691 (1986-12-01), Tomori
patent: 4681406 (1987-07-01), Naito et al.
patent: 4830475 (1989-05-01), Ishiyama et al.

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