Zoom lens system

Details Zoom lens system Zoom lens system

1989-11-16

1990-08-14

Arnold, Bruce Y.

G02B 1515, G02B 964

Patent

active

049482343

ABSTRACT:
A zoom lens system comprising, in the order from the object side, a first lens unit which has positive refractive power, a second lens unit which has negative refractive power and is movable along the optical axis for varying focal length, a third lens unit which has negative refractive power and is movable along the optical axis for varying focal length but in a locus different from that of the second lens unit, and a fourth lens unit which has positive refractive power and is always kept fixed, the first lens unit consisting of a negative meniscus lens element convex on the object side and a positive lens element, the second lens unit consisting only of a single negative meniscus lens element convex on the object side, and the third lens unit consisting of a negative lens element and a positive lens element. The zoom lens system comprises a small number of lens elements, has a compact design and features favorable imaging peformance, and the first lens unit thereof consists only two lens elements and has a small diameter.

REFERENCES:
patent: 3160699 (1964-12-01), Yamaji
patent: 4394072 (1983-07-01), Betensky

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-458377