Varifocal lens

Details Varifocal lens Varifocal lens

1996-02-28

1997-12-09

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, G02B 1514

Patent

active

056966334

ABSTRACT:
A varifocal lens is disclosed that includes, in order front to rear, a first lens group having an overall negative focal length and a second lens group having an overall positive focal length. The first and second lens groups are axially separated by a space that changes as the focal length of the varifocal lens is changed. The first lens group comprises, in order from front to rear, a biconcave lens element and a positive lens element. The second lens group comprises, in order from front to rear, a front subgroup and a rear subgroup. The front subgroup comprises, in order from front to rear, a first positive lens element, a first cemented lens, a second cemented lens having positive refractive power, and a second positive lens element. The rear subgroup comprises, in order from front to rear, a negative lens element, a positive lens element, and a negative meniscus lens element having a convex face oriented rearwardly. The varifocal lens fulfills the conditions:

REFERENCES:
patent: 4934794 (1990-06-01), Ueda
patent: 4938572 (1990-07-01), Iwasaki
patent: 5073015 (1991-12-01), Ueda

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