Fresnel lens sheet and rear projection screen

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

2007-03-27

2007-03-27

Mahoney, Christopher (Department: 2851)

Optical: systems and elements

Projection screen

Embedded particles

C359S460000, C359S742000

Reexamination Certificate

active

10779626

ABSTRACT:
A Fresnel lens sheet comprising a Fresnel lens substrate and a Fresnel lens, whose surface of the light source side has an average pitch of 200 μm or smaller and ten point roughness of 3 to 15 μm, a rear projection screen obtained by assembling the Fresnel lens sheet and a lenticular lens sheet, and a process for producing these. With the use of the Fresnel lens sheet and the rear projection screen in accordance with the present invention, a labyrinth light inside the screen and a surface reflection are diffused effectively and a ghost caused by them is remarkably reduced. Accordingly, the rear projection television employing the Fresnel lens sheet and the rear projection screen of the present invention provides excellent images without ghost light.

REFERENCES:
patent: 5513036 (1996-04-01), Watanabe et al.
patent: 5751478 (1998-05-01), Yoshimura et al.
patent: 6307675 (2001-10-01), Abe et al.
patent: 6663953 (2003-12-01), Kamiya et al.
patent: 6707605 (2004-03-01), Sekiguchi
patent: 6943948 (2005-09-01), Honda et al.
patent: 2006/0001963 (2006-01-01), Ishikawa

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