Zoom lens, image magnification projection system and video...

Optical: systems and elements – Lens – With field curvature shaping

Reexamination Certificate

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Details

C359S676000

Reexamination Certificate

active

10561073

ABSTRACT:
The present invention provides a zoom lens that suppresses the generation of unnecessary light and is suitable for a projection lens. The zoom lens is used as a projection lens of a projector in which a prism is located between the projection lens and a spatial optical modulating element B. A lens closest to the spatial optical modulating element B is a meniscus positive lens whose convex surface faces a screen. A refractive index of the meniscus positive lens is 1.75 or more.

REFERENCES:
patent: 6038078 (2000-03-01), Yamamoto
patent: 6075653 (2000-06-01), Narimatsu et al.
patent: 6115194 (2000-09-01), Yoneyama
patent: 6147812 (2000-11-01), Narimatsu et al.
patent: 6285509 (2001-09-01), Nakayama et al.
patent: 6480340 (2002-11-01), Yamamoto
patent: 6809877 (2004-10-01), Nagahara
patent: 6816320 (2004-11-01), Wada
patent: 2002/0018301 (2002-02-01), Narimatsu et al.
patent: 2000-98222 (2000-04-01), None
patent: 2001-51195 (2001-02-01), None
patent: 2001-205682 (2001-07-01), None
patent: 2001-228398 (2001-08-01), None
patent: 2001-249275 (2001-09-01), None
patent: 2001-311872 (2001-11-01), None
patent: 2002-148515 (2002-05-01), None
patent: 2002-341242 (2002-11-01), None

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