Small zoom lens

Details Small zoom lens Small zoom lens

1984-04-30

1986-04-01

Corbin, John K.

G02B 964, G02B 1304, G02B 1514

Patent

active

045794286

ABSTRACT:
A small size zoom lens comprises a front and a rear group. The front group of lenses is of a diverging nature and includes three lenses disposed on an object side, while the rear group is of a converging nature and includes three lenses disposed on an image side. The lenses, from the object side, include a negative meniscus lens, having its convex surface directed toward the object side a negative lens having its concave surface directed toward the image side, a positive lens having its convex surface directed toward the object side, a positive lens, a positive meniscus lens having its convex surface directed toward the object side, a negative lens having its concave surface directed toward the image side, and a positive lens.
From the object side, the radius of curvature of an i-th lens surface is represented as r.sub.i (i=1 to 14), the j-th axial separation between the lens surfaces as dj (j=1 to 13), the refractive index of each lens with respect to the d-line of the spectrum by n.sub.1, n.sub.2, . . . n.sub.7, respectively, and focal length of the front group by f.sub.1, the small size zoom lens satisfies the following requirements: ##EQU1##

REFERENCES:
patent: 4323302 (1982-04-01), Kimura

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