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Patent Searching and Data


Title:
WIDE ANGLE PROJECTION LENS HAVING THREE GROUPS
Document Type and Number:
WIPO Patent Application WO2006104500
Kind Code:
A9
Abstract:
A wide angle projection lens include a first lens group of negative refractive power that has at least one aspheric surface. The wide angle projection lens can output an image at a half field angle of at least 45°, where the image has substantially no distortion and requires little or no keystone correction. The wide angle projection lens can be part of an optical engine that can be implemented in rear projection or front projection display devices.

Inventors:
LU KAI CHANG (GB)
RODRIGUEZ ERNESTO M JR (US)
Application Number:
US2005017559W
Publication Date:
November 01, 2007
Filing Date:
May 19, 2005
Export Citation:
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Assignee:
3M INNOVATIVE PROPERTIES COMPANY
International Classes:
G02B13/04; G02B9/00; G02B9/12; G02B13/06; G02B15/177; G02B27/14
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