Macro lens system

Details Macro lens system Macro lens system

1998-12-04

2000-11-28

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1522, G02B 900

Patent

active

061543241

ABSTRACT:
A macro lens system includes a positive first lens group, an aperture and a negative second lens group arranged in the order from an object side. The driving mechanism drives the lens groups and the aperture to move independently along an optical axis for focusing. When the lens groups are moved toward the object side, the aperture is also moved to the object side. The moving amount of the aperture is determined to control increasing of an effective F-number. The moving amount of the aperture is smaller than that of the first lens group and is larger than that of the second lens group.

REFERENCES:
patent: 4508433 (1985-04-01), Kitagishi et al.
patent: 4666260 (1987-05-01), Itoh
patent: 4772108 (1988-09-01), Sugiyama
patent: 4923292 (1990-05-01), Matsuo
patent: 4986643 (1991-01-01), Moriyama
patent: 5331464 (1994-07-01), Ito et al.
patent: 5592234 (1997-01-01), Oshikiri et al.
patent: 5850577 (1998-12-01), Ito

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