Two-group small zoom lens

Details Two-group small zoom lens Two-group small zoom lens

1998-02-17

2000-01-11

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359682, G02B 1514

Patent

active

060142685

ABSTRACT:
An inexpensive, high performance zoom lens includes, as measured from the object side, a negative first lens group and a positive second lens group. The overall length of the zoom lens is reduced by making one of the lens element surfaces of the first lens group G.sub.1 aspherical. A lens element in the second lens group is designed to be a biconvex lens with the same absolute value of radii of curvature, to thereby make the zoom lens inexpensive to produce and assemble.

REFERENCES:
patent: 4169660 (1979-10-01), Nakamura
patent: 4266860 (1981-05-01), Hayashi
patent: 4540249 (1985-09-01), Mogami
patent: 5552937 (1996-09-01), Ono et al.
patent: 5781349 (1998-07-01), Sugawara
patent: 5844724 (1998-12-01), Foo

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