Projector lens system

Details Projector lens system Projector lens system

2005-05-03

2005-05-03

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S649000, C359S680000, C359S682000, C359S689000, C359S691000, C359S716000, C359S717000, C359S749000, C359S753000, C353S037000, C353S101000

Reexamination Certificate

active

06888682

ABSTRACT:
A projector lens system includes a negative first lens group and a positive second lens group. The first lens group comprises a first lens element that is formed as a negative meniscus lens element, a positive or negative second lens element, a negative third lens element, a positive fourth lens element that is cemented to or separated from the third lens element, and a negative fifth lens element. The first lens group satisfies condition (1) with respect to the refractive power thereof, and satisfies condition (2) with respect to the refractive power of the negative first lens element of the negative first lens group:in-line-formulae description="In-line Formulae" end="lead"?0.6<fw/|fI|<1.0(fI<0)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.3<fI/f1,1<0.7  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinfw: focal length of the entire projector lens system at the wide-angle extremity;fI: the focal length of the negative first lens group; andf1,1: the focal length of the negative first lens element of the negative first lens group.

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