Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Reexamination Certificate
2005-04-25
2008-11-18
Mahoney, Christopher (Department: 2862)
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
C359S742000
Reexamination Certificate
active
07453638
ABSTRACT:
The present invention provides a Fresnel lens sheet that scarcely makes the projected image distorted, and others. The Fresnel lens sheet has a plurality of unit total reflection Fresnel lenses arranged on the light-entering side, each unit lens having a light-entering surface and a total reflection surface that totally reflects a part of or all of the imaging light that has passed through the light-entering surface to deflect the light in the desired direction. This Fresnel lens sheet is formed so that it fulfills the relationship H1×H1/(10×E1×T1×T1)≦3L/2000, where H1represents the length (cm) in the vertical direction of the Fresnel lens sheet; L1, the length (cm) in the horizontal direction of the Fresnel lens sheet; T1, the thickness (cm) of the Fresnel lens sheet; and E1, the modulus of elasticity (kgf/cm2) of the Fresnel lens sheet. Further, by using, to make up the Fresnel lens sheet, a Fresnel-lens-molded sheet having unit total reflection Fresnel lenses and a backing sheet laminated to the light-emerging surface of the Fresnel-lens-molded sheet, improvement in the efficiency of mold releasing operation that is conducted in the production of the Fresnel lens sheet is achieved.
REFERENCES:
patent: 6639736 (2003-10-01), Watanabe et al.
patent: 6650471 (2003-11-01), Doi
patent: 6809889 (2004-10-01), Tokuda et al.
patent: A 61-208041 (1986-09-01), None
patent: A 03-135501 (1991-06-01), None
patent: A 08-122923 (1996-05-01), None
patent: A 2000-155203 (2000-06-01), None
patent: A 2000-214533 (2000-08-01), None
patent: A 2000-221603 (2000-08-01), None
patent: A 2001-075178 (2001-03-01), None
patent: A 2002-107835 (2002-04-01), None
patent: A 2002-264148 (2002-09-01), None
patent: A 2003-084111 (2003-03-01), None
patent: A 2003-177475 (2003-06-01), None
patent: A 2003-177477 (2003-06-01), None
patent: A 2003-313445 (2003-11-01), None
patent: A 2004-093847 (2004-03-01), None
patent: A 2004-093918 (2004-03-01), None
Dai Nippon Printing Co. Ltd.
Mahoney Christopher
Oliff & Berridg,e PLC
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