Zoom lens

Details Zoom lens Zoom lens

1990-06-22

1991-07-16

Bovernick, Rodney B.

350423, 350469, G02B 1500

Patent

active

050320130

ABSTRACT:
A zoom lens comprises, in succession from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. The zoom lens is designed such that during the zooming from the wide angle end to the telephoto end, the third lens group and the fourth lens group are moved along the optic axis thereof and during the focusing on an infinity object to a short distance object, they are moved toward the image side while having the spacing therebetween relatively varied. The zoom lens is further designed to satisfy the following condition:

REFERENCES:
patent: 4240704 (1980-12-01), Goto
patent: 4441792 (1984-04-01), Takeoka
patent: 4907867 (1990-03-01), Perrin et al.

Affiliated with

Also associated with

Rating

Zoom lens 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, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-127366