Two-unit zoom lens system

Details Two-unit zoom lens system Two-unit zoom lens system

1993-02-18

1995-10-17

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359690, G02B 1514

Patent

active

054596165

ABSTRACT:
The invention provides a two-unit or positive-negative type of zoom lens that has a zoom range of the order of 38-70 mm, comprises six lens groups or six lenses, and makes use of an aspherical plastic lens for cost reduction and for improving its performance as well. This zoom lens system is constructed from a first unit I of positive power and a second unit II of negative power and is designed to be variable in the air space between both the units for zooming. The first unit I includes a positive meniscus lens L1 convex on the object side, a negative lens L2, a positive lens L3 and a lens L4, and the second unit II includes a positive meniscus lens L5 convex on the image side and a negative meniscus lens L6 convex on the image side. At least L5 consists of a plastic lens having an aspherical surface.

REFERENCES:
patent: 4772106 (1988-09-01), Ogata et al.
patent: 4936661 (1990-06-01), Betensky et al.
patent: 5109299 (1992-04-01), Kato
patent: 5113287 (1992-05-01), Nakayama

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