Lens system

Details Lens system Lens system

1995-04-04

1997-09-02

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1514, G02B 900

Patent

active

056638370

ABSTRACT:
A lens system has a front unit having a positive refractive power and a rear unit having a negative refractive power, in order from the object side, and performs a refractive power varying (zooming) operation by changing an air gap between the two units. The front unit is composed of three lens components of negative, negative, and positive refractive powers.

REFERENCES:
patent: 4844599 (1989-07-01), Ito
patent: 5126884 (1992-06-01), Sato
patent: 5162947 (1992-11-01), Ito
patent: 5353163 (1994-10-01), Shibayama et al.
patent: 5541772 (1996-07-01), Lin
"Optics:Second Edition," by Eugene Hecht, Addison-Wesley Publishing Company, Reading, Massechusetts, copyright 1987, pp. 129-132 and 149-153.

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