Fresnel lens, screen, image displaying device, lens forming...

Details Fresnel lens, screen, image displaying device, lens forming... Fresnel lens, screen, image displaying device, lens forming...

2006-10-03

2006-10-03

Mahoney, Christopher (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S460000, C359S742000

Reexamination Certificate

active

07116476

ABSTRACT:
A Fresnel lens has a plurality of pitch areas in which a plurality of hybrid type prism portions are arranged. Each hybrid type prism portion has a refraction type prism portion and a total reflection type prism portion. In the refraction type prism portion, a ray of incident light Li1of an incident angle “a” is refracted twice and goes out as a ray of outgoing light Lo1of an outgoing angle “f”. In the total reflection type prism portion, a ray of incident light Li2of the incident angle “a” is refracted, totally reflected and refracted in that order and goes out as a ray of outgoing light Lo2parallel to the ray of outgoing light Lo1.

REFERENCES:
patent: 4443088 (1984-04-01), Ohtaka
patent: 4674836 (1987-06-01), Yata et al.
patent: 4708435 (1987-11-01), Yata et al.
patent: 4729631 (1988-03-01), Takahashi et al.
patent: 6249376 (2001-06-01), Goto
patent: 6724535 (2004-04-01), Clabburn
patent: 6804055 (2004-10-01), Peterson et al.
patent: 55-111936 (1980-08-01), None
patent: 59-15925 (1984-01-01), None
patent: 61-52601 (1986-03-01), None
patent: 61-256337 (1986-11-01), None
patent: 61-277935 (1986-12-01), None
patent: 62-19837 (1987-01-01), None
patent: 62-113131 (1987-05-01), None
patent: 63-2031 (1988-01-01), None
patent: 2-134527 (1990-11-01), None
patent: 4-152332 (1992-05-01), None
patent: 4-281443 (1992-10-01), None
patent: 4-362625 (1992-12-01), None
patent: 7-276371 (1995-10-01), None
patent: 10-166202 (1998-06-01), None

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