Zoom lens system

Details Zoom lens system Zoom lens system

1995-06-23

1997-12-23

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359687, G02B 1514

Patent

active

057012040

ABSTRACT:
A zoom lens system includes from the object side a first lens unit of positive refractive power and a second lens unit of negative refractive power. The zoom lens system further includes a rearmost lens unit on the most image side. During zooming from the shortest focal length condition to the longest focal length condition, the first lens unit is moved toward the object side so that the distance between the first and second lens units increases. During focusing to a shorter object distance condition, the first lens Unit .is moved toward the object side while the rearmost lens unit is moved toward the image side, and a ratio between movement amounts of the first and rearmost lens units varies according to zooming.

REFERENCES:
patent: 4576448 (1986-03-01), Ikari
patent: 4787719 (1988-11-01), Imai
patent: 5191475 (1993-03-01), Terasawa et al.

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