Zoom lens including a wide angle of view

Details Zoom lens including a wide angle of view Zoom lens including a wide angle of view

Filed on

1984-07-02

Date issued

1986-12-30

Examiner

Corbin, John K.

Other Related Categories

G02B 1514

Type

Patent

Status

active

Patent number

046325190

Description

ABSTRACT:
A zoom lens including a wide angle of view has, in succession from the object side, a first lens group of positive refractive power, a second lens group of negative refractive power, a third lens group of positive refractive power and a fourth lens group of positive refractive power. When zooming is to be effected from the wide angle end to the telephoto end, the first lens group and the fourth lens group are monotonously moved toward the object side and at the same time, the third lens group is monotonously moved toward the object side by an amount of movement 0.4-0.8 time as great as the amount of movement of the first and fourth lens groups and the second lens group is moved toward the object side in the vicinity at least the wide angle end. The zoom lens satisfies the following condition: 4.5<f.sub.1 /-f.sub.2 <6.5
where f.sub.1 is the focal length of the first lens group and f.sub.2 is the focal length of the second lens group.

REFERENCES:
patent: 4359270 (1982-11-01), Okudaira

Affiliated with

Also associated with

Rating

Zoom lens including a wide angle of view does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens including a wide angle of view, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens including a wide angle of view will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1544046