Zoom lens system

Details Zoom lens system Zoom lens system

1996-08-09

1999-12-14

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514

Patent

active

060025298

ABSTRACT:
A zoom lens system for use in a compact lens shutter camera has excellent optical properties at a high zoom ratio of 4-5 across the entire zoom range with a small number of lenses. The zoom lens system has, from the object side to the image side, a positive first lens unit, a negative second lens unit, a positive third lens unit and a negative fourth lens unit, wherein the air spaces between each lens unit vary during a zooming operation. The zoom lens system fulfills predetermined conditions related to the back focal distance, the shifting amount of the second and third lens units during zooming and the thickness of the third lens unit.

REFERENCES:
patent: 4666257 (1987-05-01), Tanaka et al.
patent: 4776680 (1988-10-01), Tanaka
patent: 5086356 (1992-02-01), Kojima et al.
patent: 5105311 (1992-04-01), Tokumaru et al.
patent: 5196962 (1993-03-01), Aoki
patent: 5272566 (1993-12-01), Aoki
patent: 5299064 (1994-03-01), Hamano et al.
patent: 5414562 (1995-05-01), Ueda
patent: 5543970 (1996-08-01), Hata 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-868935