Zoom lens

Details Zoom lens Zoom lens

1994-03-10

1997-06-10

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, 359687, G02B 1514

Patent

active

056382162

ABSTRACT:
A zoom lens includes, from front to rear, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, zooming being performed by moving the second and fourth lens units, and focusing being performed by moving the fourth lens unit, wherein the second lens unit is constructed from three single lenses, i.e., from front to rear, a negative first lens having a strong concave surface facing the image side, a negative second lens of bi-concave form and a positive third lens having a strong convex surface facing the object side.

REFERENCES:
patent: 4657351 (1987-04-01), Mori
patent: 4859042 (1989-08-01), Tanaka
patent: 5009492 (1991-04-01), Hamano
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5138492 (1992-08-01), Hamano et al.
patent: 5233471 (1993-08-01), Nakamura et al.
patent: 5353157 (1994-10-01), Horiuchi

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-769580