Zoom lens

Details Zoom lens Zoom lens

1995-04-20

1998-08-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1514

Patent

active

057903166

ABSTRACT:
A zoom lens is disclosed comprising, from front to rear, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a flare cut stop for cutting a lower marginal ray of an off-axial bundle of rays for a maximum image height, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, wherein the second and third lens units move axially to effect zooming, while either varying the aperture diameter of the flare cut stop or axially moving the flare cut stop to thereby cut the harmful rays for good optical performance.

REFERENCES:
patent: 3918798 (1975-11-01), Takano
patent: 4705363 (1987-11-01), Ikemori
patent: 5097360 (1992-03-01), Fukami et al.
patent: 5136431 (1992-08-01), Terasawa et al.

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-1184111