High contrast projection screen

Details High contrast projection screen High contrast projection screen

2005-11-23

2009-02-24

Mahoney, Christopher E (Department: 2862)

Optical: systems and elements

Projection screen

With reflector or additional screen

C359S459000

Reexamination Certificate

active

07495828

ABSTRACT:
An image display system includes a reflecting screen that has a reflecting surface. The reflecting surface includes micro-ridges having a plurality of reflecting ridge-surfaces wherein the reflecting ridge-surfaces constituting a Fresnel mirror whereby the reflecting ridge-surfaces reflecting parallel reflecting light beams for all incident light beams projected from a light source located at a focal point of the Fresnel mirror. The micro-ridges further include a plurality of darkened ridge-surfaces with reduced reflectance for reducing ambient reflections. The micro-ridges further constitute a continuous concentric ridge having the reflecting ridge-surfaces facing a bottom direction toward the focal point of the Fresnel mirror for disposing a light source near a bottom location of the projecting screen. The continuous concentric ridge further has reduced reflectance ridge-surfaces facing a top direction away from the focal point of the Fresnel mirror.

REFERENCES:
patent: 4911529 (1990-03-01), Van De Ven
patent: 5801889 (1998-09-01), Meyers et al.
patent: 5969867 (1999-10-01), Fukushima et al.
patent: 6678097 (2004-01-01), McKenney
patent: 6842282 (2005-01-01), Kuroda et al.
patent: 6898008 (2005-05-01), Sun

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