Telecentric zoom lens

Details Telecentric zoom lens Telecentric zoom lens

2007-02-13

2007-02-13

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

11197362

ABSTRACT:
The present invention is directed to provide a telecentric zoom lens capable of attaining a small numerical aperture, a wide angle of view, reduced distortion, high resolution, reduced chromatic aberration, small aperture, and yet avoiding a cost increase and also to provide the telecentric zoom lens that shows a unified imaging ability relative to a varied distance to the screen and has a minimum projection distance to the screen got shorter. The telecentric zoom lens is comprised of a first group of lenses negative in power, a second group of lenses positive in power, and a third group of lenses positive in power, and a focal length fw at a wide angle of view can be given in relation with focal lengths f1,f2and f3of the first, second and third groups of lenses respectively, as follows:in-line-formulae description="In-line Formulae" end="lead"?2.5≧|f1/fw|≧1.5,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?4≧f2/fw≧2.5, andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?13≧f3/fw≧3.in-line-formulae description="In-line Formulae" end="tail"?

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patent: 2003/0165019 (2003-09-01), Yamamoto
patent: 2006/0132929 (2006-06-01), Ito
patent: 10-307332 (1998-11-01), None
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patent: 2002-107627 (2002-04-01), None
patent: 2003-015038 (2003-01-01), None
patent: 2003-195169 (2003-07-01), None

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