Zoom lens system having minimal aberration fluctuation at short

Details Zoom lens system having minimal aberration fluctuation at short Zoom lens system having minimal aberration fluctuation at short

1993-11-22

1998-06-09

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, 359684, G02B 1514

Patent

active

057644217

ABSTRACT:
A zoom lens system having three lens units, that is, a negative lens unit, a positive lens unit, and a negative lens unit. The idea of floating system is introduced into the rear focusing system to minimize the degree of aberration fluctuation at a short object distance with a simple lens arrangement, thereby stabilizing the optical performance during focusing at a short object distance. The zoom lens system includes a 1-st lens unit (G1) having a negative refractive power, a 2-nd lens unit (G2) having a positive refractive power, and a 3-rd lens unit (G3) having a negative refractive power, and effects zooming from the wide end to the tele end by varying the spacing between each pair of adjacent lens units. With the 2-nd lens unit (G2) defined as a focusing lens unit, focusing is effected by varying the axial air spacing between a lens component (L.sub.F) of the 2-nd lens unit (G2) that is the closest to the image side and the remaining lens component (L.sub.F ').

REFERENCES:
patent: 4702567 (1987-10-01), Kato et al.
patent: 4726667 (1988-02-01), Tachihara
patent: 5002373 (1991-03-01), Yamanashi
patent: 5111338 (1992-05-01), Nakayama
patent: 5270865 (1993-12-01), Kikuchi et al.
patent: 5276553 (1994-01-01), Tatsuno

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