Fresnel lens sheet and rear projection screen using it

Details Fresnel lens sheet and rear projection screen using it Fresnel lens sheet and rear projection screen using it

2008-03-04

2008-03-04

Mahoney, Christopher (Department: 2862)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S460000, C359S742000

Reexamination Certificate

active

07339733

ABSTRACT:
A Fresnel lens sheet which is bright due to a small light quantity loss, is restricted in speckles and ghosts, does not produce moires, and can be used in an inexpensive transmitting screen, wherein the sheet satisfies the diffusion characteristics of the following expressions (1) and (2), or the following expressions (3), (4) and (5). γ/α≦2.8 (1) ζ/α≦6 (2), where α is viewing half value angle, γ viewing 1/10 value angle, and ζ viewing 1/100 value angle. 2.0°≦α≦5.5° (3), where α is viewing half value angle, γ≦12° (4), where γ is viewing 1/10 value angle, ζ≦18° (5), where ζ is viewing 1/100 value angle.

REFERENCES:
patent: 3712707 (1973-01-01), Henkes, Jr.
patent: 6807020 (2004-10-01), Wolfe
patent: 6900945 (2005-05-01), Mori et al.
patent: 7190517 (2007-03-01), Abe et al.
patent: 2000-180968 (2000-06-01), None
patent: 2003-066206 (2003-03-01), None

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