Zoom lens system

Details Zoom lens system Zoom lens system

2006-08-08

2006-08-08

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07088522

ABSTRACT:
A zoom lens system is disclosed, in which the decrease of the peripheral light quantity at the wide-angle end is improved. The zoom lens system comprises, in order from an object side to an image side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, an aperture stop, a third lens unit having a positive optical power and a fourth lens unit having a positive optical power. The four lens units and the aperture stop are moved during zooming. When MS represents movement amount of the aperture stop during zooming from the wide-angle end to the telephoto end and M3represents the maximum movement amount of the third lens unit in the optical axis direction during zooming from the wide-angle end to the telephoto end, −1.8<MS/M3<−0.5 is satisfied.

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patent: 2001-194586 (2001-07-01), None
patent: 3352240 (2002-09-01), None

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