Standard zoom lens

Details Standard zoom lens Standard zoom lens

1995-02-15

1996-10-08

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359715, G02B 1514

Patent

active

055637396

ABSTRACT:
A zoom lens has a first lens unit having a negative refractive power as a whole, and a second lens unit having a positive refractive power as a whole, and effects zooming by changing the air gap between the first and second lens units. The first lens unit has a first negative meniscus lens with a concave surface having a more intense curvature and facing the image side, a second negative meniscus lens with a concave surface having a more intense curvature and facing the image side, and a positive lens with a convex surface facing the object side. The second lens unit has a positive lens component having at least two positive lenses, a negative lens component, and a positive lens component. At least one of the lens surfaces constituting the first lens unit is an aspherical surface. The zoom lens satisfies the following conditions:

REFERENCES:
patent: 5076677 (1991-12-01), Sato

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