Zoom lens system

Details Zoom lens system Zoom lens system

1993-10-12

1995-07-18

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359716, 359715, G02B 1514, G02B 302

Patent

active

054347114

ABSTRACT:
The improved zoom lens system comprises, in order from the object side, a positive first lens group, a positive second lens group and a negative third lens group, the second lens group consisting of a single positive lens group that has aspheric surfaces on both surfaces closest to the object and closest to the image, and all of the first, second and third lens groups are moved towards the object during a zoom from the wide-angle end to the narrow-angle end, the lens system further satisfying specific conditions.
This zoom lens system is capable of exhibiting a zoom ratio of at least 2.5 using 4 or 5 lens elements and has an F number of about 1:4-8 to make itself practical for use with still cameras.

REFERENCES:
patent: 4822152 (1989-04-01), Yamanashi
patent: 5087988 (1992-02-01), Nakayama
patent: 5166828 (1992-11-01), Ogata
patent: 5327290 (1994-07-01), Fukushima et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2420987