Zoom lens system

Details Zoom lens system Zoom lens system

2006-08-08

2006-08-08

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

07088521

ABSTRACT:
A zoom lens system including, in order from an object side to an image side, a first lens unit of positive optical power, and a second lens unit of negative optical power, followed by a lens component having a lens unit, wherein at least one of the first lens unit and the second lens unit moves during zooming. One of the lens units of the zoom lens system includes a layer made of a material that satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?11<νIT<27in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.2<θIT<0.4.in-line-formulae description="In-line Formulae" end="tail"?Wherein νIT is an Abbe number of the layer, and θIT is a partial dispersion ratio for the g-spectral line and f-spectral line of the layer. The layer has an optical power of a sign opposite to that of the lens unit including the layer.

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patent: 2001-21803 (2001-01-01), None

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