Offset zoom lens for reflective light modulators

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

1995-06-02

1997-04-08

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359691, 359717, G02B 1515, G02B 1514, G02B 302

Patent

active

056193815

ABSTRACT:
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.

REFERENCES:
patent: 4159865 (1979-07-01), Kawamura et al.
patent: 5268790 (1993-12-01), Chen

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