Three-unit compact zoom lens system

Optical: systems and elements – Lens – With variable magnification

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

359708, G02B 1514

Patent

active

053531590

ABSTRACT:
This invention relates to a three-unit compact zoom lens system having a zoom ratio of about 2, whose telephoto ratio at the wide angle end is as short as 1.3 or lower and in which the lens diameter of the first lens unit is reduced. This zoom lens system comprises a first positive lens unit G1, a second positive lens unit G2 and a third negative lens unit G3, and in zooming from the wide angle to telephoto end, the first and third lens units are movable toward the object side and the second lens unit is movable toward the object side at a speed relatively lower than that at which the first and third lens units are moved. Furthermore, the present zoom lens system satisfies the following condition:

REFERENCES:
patent: 4726668 (1988-02-01), Nakayama et al.
patent: 4773744 (1988-09-01), Yamanashi
patent: 4983027 (1991-01-01), Kojima
patent: 5069536 (1991-12-01), Ogata
patent: 5166828 (1992-11-01), Ogata

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

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

Rate now

     

Profile ID: LFUS-PAI-O-585740

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.