Wide-angle projection lens for front projection display systems

Details Wide-angle projection lens for front projection display systems Wide-angle projection lens for front projection display systems

2006-10-24

2006-10-24

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S680000, C348S744000

Reexamination Certificate

active

07126767

ABSTRACT:
A wide-angle projection lens includes a first lens group of negative refractive power, the first lens group having at least one aspheric surface. The projection lens also includes a second lens group of substantially zero refractive power and a third lens group of positive refractive power. The projection lens satisfies the following three conditions: |F1/F|<4.0 (Condition (1)), |F2/F|>50 (Condition (2)) and |F3/F|<3.5 (Condition (3)). In these conditions, F is the focal length of the wide-angle projection lens; F1is the focal length of the first lens group; F2is the focal length of the second lens group; and F3is the focal length of the third lens group. The wide-angle projection lens is used in a front projection display device.

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