Zoom lens system for compact camera

Details Zoom lens system for compact camera Zoom lens system for compact camera

1987-12-21

1989-06-06

Corbin, John K.

350426, G02B 1514, G02B 962

Patent

active

048366609

ABSTRACT:
A zoom lens for a compact camera having a small degree of constraint on back focus and which can be manufactured at a low cost. The inventive lens system is divided into a first lens group having a positive focal length and a second lens group having a negative focal length, zooming being achieved by varying the distance between the first and second groups. The first group is composed of a front lens unit having a nagative focal length inclusive of at least one positive lens element and at least one negative lens element, a rear lens unit having a positive focal length positioned on the image side of the front lens unit and which includes at least one negative lens element and at least one positive lens element, and a middle lens unit positioned between the front and rear lens units and which includes at least one positive lens element having a convex surface directed toward the image side.

REFERENCES:
patent: 4720179 (1988-01-01), Ito

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-36978