Short distance zoom lens system

Details Short distance zoom lens system Short distance zoom lens system

Filed on

1979-08-27

Date issued

1981-12-01

Examiner

Corbin, John K.

Other Related Categories

G02B 1518

Type

Patent

Status

active

Patent number

043033113

Description

ABSTRACT:
A short distance zoom lens system for forming an image of an object lying at any short distance at a predetermined short distance comprises, in order from the object side, a first group which is a divergent lens group, a second group which is a convergent lens group, and a third group which is a divergent lens group. The second and the third group are movable relative to each other in the direction of the optic axis to effect a magnification change. The first group is stationary during the magnification change and is movable in the direction of the optic axis independently of the second and third groups in accordance with the distance to the object.

REFERENCES:
patent: 3603669 (1971-09-01), Lai
patent: 3705759 (1972-12-01), Cook et al.
patent: 3848969 (1974-11-01), Tajima

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