Fresnel lens sheet and transmission type projection screen

Details Fresnel lens sheet and transmission type projection screen Fresnel lens sheet and transmission type projection screen

2005-09-13

2005-09-13

Mahoney, Christopher (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S742000

Reexamination Certificate

active

06943948

ABSTRACT:
A Fresnel lens sheet comprises a Fresnel lens on one surface thereof, wherein respective unit surfaces constructing the Fresnel lens sheet have rough surfaces. Since it has a rough surface, it enables suppressing the occurrence of moire, when making up a screen. The other Fresnel lens sheet comprises a Fresnel lens on one surface thereof, and a fly-eye lens or prisms as a regular concavities and convexities configuration for suppressing regular reflection on the surface thereof on a side opposite to the side having the Fresnel lens formed thereon. Since it has on its rear surface a fly-eye lens or a prism, it enables suppressing the occurrence of ghost image.

REFERENCES:
patent: 3712707 (1973-01-01), Henkes, Jr.
patent: 3718078 (1973-02-01), Plummer
patent: 4468092 (1984-08-01), Inoue et al.
patent: 4674836 (1987-06-01), Yata et al.
patent: 4721361 (1988-01-01), van de Ven
patent: 5477380 (1995-12-01), Watanabe et al.
patent: 5513036 (1996-04-01), Watanabe et al.

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