Zoom lens assembly

Details Zoom lens assembly Zoom lens assembly

1993-04-16

1995-03-07

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, 348358, G02B 1514, G02B 1318

Patent

active

053963679

ABSTRACT:
A zoom lens assembly includes, in succession order from the object side, a first fixed lens group of a positive refractive power including a negative lens, a positive lens and a positive meniscus lens; a second movable lens group of a negative refractive power including a negative meniscus lens, a positive lens and a positive lens for effecting a variation of image magnification by moving along an optical axis of the zoom lens assembly; a third fixed lens group of a positive refractive power having at least one aspherical face and including a positive lens and a negative lens; and a fourth movable lens group of a positive refractive power including having at least one aspherical surface and also including negative and positive lenses cemented together.

REFERENCES:
patent: 4802747 (1989-02-01), Horiuchi
patent: 4818083 (1989-04-01), Mihara
patent: 4859042 (1989-08-01), Tanaka
patent: 5100223 (1992-03-01), Ono et al.
patent: 5221994 (1993-06-01), Nishio

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