Offset zoom lens for reflective light modulators

Details Offset zoom lens for reflective light modulators Offset zoom lens for reflective light modulators

G - Physics

02

B

G02B 27/18 (2006.01) G02B 13/04 (2006.01) G02B 13/16 (2006.01) G02B 15/177 (2006.01) G02B 27/00 (2006.01)

Patent

CA 2177758

A projection optical system. The system (10) contains two movable lens groups, a zoom lens group (20) and a compensator group (18). The compensator group (18) includes a movable aperture stop (21), thereby eliminating the need for a variable aperture stop. Both groups contain at least one aspheric lens element (22,32) for elimination of aberrations. The compensator group has a positive power, with the zoom group having a negative power, resulting in a reverse telephoto configuration.

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