Zoom lens system in finite conjugate distance

Details Zoom lens system in finite conjugate distance Zoom lens system in finite conjugate distance

1996-09-05

1997-09-23

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359688, G02B 1514

Patent

active

056710941

ABSTRACT:
With a stop disposed at the center, a lens system are composed of four sheets of positive, negative, negative, and positive lenses. At the time of variable magnification, the whole lens system is moved while distances between the lenses are changed, whereby a low cost and a compact size are attained in a zoom lens system for copying. This lens system is constituted by four sheets of positive, negative, negative, and positive lenses (L.sub.1 to L.sub.4) which are disposed in pairs laterally symmetrical to each other with respect to the stop. At the time of reducing or enlarging, the distance between the first lens (L.sub.1) and second lens (L.sub.2), the distance between the third lens (L.sub.3) and fourth lens (L.sub.4), and the distance between the second lens (L.sub.2) and third lens (L.sub.3) are made larger than those under real-size magnification, while the whole system is moved with the distance from the object surface to the imaging surface being held substantially constant so as to attain variable power.

REFERENCES:
patent: 4149774 (1979-04-01), Hirano et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1940506