Fresnel lens sheet, rear projection screen and rear...

Details Fresnel lens sheet, rear projection screen and rear... Fresnel lens sheet, rear projection screen and rear...

2005-11-01

2005-11-01

Nguyen, Judy (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S742000, C359S460000, C359S453000

Reexamination Certificate

active

06961176

ABSTRACT:
A Fresnel lens sheet has an entrance surface provided with a plurality of total-reflection Fresnel lens elements. Each of the total-reflection Fresnel lens elements has a light-receiving facet and a total-reflection facet that deflects part of or all the image light fallen on the light-receiving facet in a desired direction. The Fresnel lens sheet meets a requisite condition expressed by an expression: A1≦0.6T1/L1, where L1(mm) is the horizontal length of the Fresnel lens sheet, T1(mm) is the thickness of the Fresnel lens sheet, and A1(%) is maximum elongation percentage of the Fresnel lens sheet at which the Fresnel lens sheet lengthens due to moisture absorption. The Fresnel lens sheet includes a Fresnel lens element sheet, and an auxiliary sheet attached to the exit side of the Fresnel lens element sheet. The Fresnel lens element sheet enables efficient molding-removing work for removing the Fresnel lens element sheet from a mold.

REFERENCES:
patent: 5200854 (1993-04-01), Ogino et al.
patent: 6088158 (2000-07-01), Kimura
patent: 6348993 (2002-02-01), Hori
patent: 61-208041 (1986-09-01), None

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