Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1998-07-27

1999-10-19

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359715, 359684, G02B 1514, G02B 302

Patent

active

059698799

ABSTRACT:
Disclosed is a compact zoom lens system. The lens systems includes a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power. The first lens group and the third lens group are fixed against an image plane. The second lens group is linearly movable for variable magnification. The fourth lens group is able to compensate for moving of an image plane and is linearly movable toward an object for focusing. The lens system is governed by the following relationship: 0<.vertline.f.sub.II-2 /f.sub.II-3 .vertline.<1.2, where f.sub.II-2 is a focal length of a second lens of the second lens group, and f.sub.II-3 is a focal length of a third lens of the second lens group.

REFERENCES:
patent: 3501224 (1970-03-01), Takahashi
patent: 5313331 (1994-05-01), Mihara
patent: 5321552 (1994-06-01), Horiuchi et al.
patent: 5341243 (1994-08-01), Okuyama et al.
patent: 5530592 (1996-06-01), Tochigi

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