Projection zoom lens system and projector apparatus

Details Projection zoom lens system and projector apparatus Projection zoom lens system and projector apparatus

1999-07-28

2000-11-14

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02C 1514

Patent

active

061478121

ABSTRACT:
A projection zoom lens system of the present invention for projecting image onto a screen from a light modulator such as a DMD includes a first lens group having a negative refractive power and a second lens group having a positive refractive power arranged in this order from the screen side. An outer diameter LD of the last lens and a back focus at the wide-angle end Bfw of the projection zoom lens system satisfy the condition below.

REFERENCES:
patent: 5644435 (1997-07-01), Shikama

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