Zoom lens of rear focus type

Details Zoom lens of rear focus type Zoom lens of rear focus type

1992-05-29

1993-06-22

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359687, 359708, G02B 1514, G02B 1318

Patent

active

052219941

ABSTRACT:
A zoom lens is disclosed, having four lens units of positive, negative, positive and positive refractive powers in this order from the object side, the focal length being varied by moving the second lens unit, and compensation for the image shift with zooming and focusing being performed by moving the fourth lens unit, while the first and third lens units remain stationary. The third lens unit has a positive first lens and a negative second lens having a concave surface facing the object side. The fourth lens unit has a negative first lens, a positive second lens and a positive third lens. The zoom lens satisfies the following conditions:

REFERENCES:
patent: 5009492 (1991-04-01), Hamano
patent: 5056900 (1991-10-01), Mukaiya et al.
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5138492 (1992-08-01), Hamano et al.

Affiliated with

Also associated with

Rating

Zoom lens of rear focus type 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 of rear focus type, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens of rear focus type will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1444311