Zoom lens

Details Zoom lens Zoom lens

1995-08-29

1998-08-11

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359715, G02B 1514, G02B 302

Patent

active

057935327

ABSTRACT:
The invention provides a high-performance wide-angle zoom lens system which has a zoom ratio of 2 or more and an angle of view of 65.degree. or more at the wide-angle end and comprises a reduced number of lenses, and so is favorable for reducing the size, weight, and cost of a camera used therewith. This zoom lens system comprises a first lens group G1 of negative power, a second lens group G2, a third lens group G3 of positive power and a fourth lens group G4 of negative power, with the space between the respective lens groups being varied for zooming. The first lens group G1 consists of a negative lens alone, the second and third lens groups G2 and G3 include one independent negative lens and two positive lenses in all, and the fourth lens group G4 comprises one negative lens or alternatively two lenses, positive and negative.

REFERENCES:
patent: 4756609 (1988-07-01), Estelle
patent: 4787718 (1988-11-01), Cho
patent: 5111338 (1992-05-01), Nakayama
patent: 5270865 (1993-12-01), Kikuchi et al.
patent: 5274504 (1993-12-01), Itoh
patent: 5365376 (1994-11-01), Itoh

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-394881