Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1989-01-19

1991-02-26

Sugarman, Scott J.

350432, G02B 1514, G02B 1318

Patent

active

049957074

ABSTRACT:
A compact, light-weight vari-focal lens system having a high vari-focal ratio, a high aperture ratio and comprising a small number of lens components. Said vari-focal lens system comprises a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power and a fourth lens unit having positive refractive power, said second and third lens units being shifted along the optical axis for varying focal length while varying the airspace reserved therebetween, said second lens unit consisting of a single concave lens component having an aspherical surface and said third lens unit consisting of a single positive lens component.

REFERENCES:
patent: 4416518 (1983-12-01), Hugues et al.
patent: 4721371 (1988-01-01), Imai

Affiliated with

Also associated with

Rating

Vari-focal lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Vari-focal lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vari-focal lens system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-291006