Ultra compact zoom lens system

Details Ultra compact zoom lens system Ultra compact zoom lens system

Filed on

1984-09-05

Date issued

1987-06-16

Examiner

Corbin, John K.

Other Related Categories

350423, G02B 704, G02B 1515

Type

Patent

Status

active

Patent number

046732586

Description

ABSTRACT:
The present invention is to provide an ultra compact zoom lens system which comprises from an object side to an image side, a first lens group of a positive refracting power, a second lens group of a negative refracting power with a first variable air space formed between the first and second lens groups, a third lens group of a positive refracting power, an fourth lens group of a negative refracting power with a second variable air space formed between the third and fourth lens groups, wherein the first lens group is shiftable from the image side to the object side with an increasing of the first variable air space in the zooming operation from the shortest focal length to the longest focal length, and wherein the fourth lens group is shiftable from the image side to the object side with a decreasing of the second variable air space in the zooming operation from the shortest focal length to the longest focal length.

REFERENCES:
patent: 4494828 (1985-01-01), Masumoto et al.

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