Fresnel lens and projection display device using one such lens

Details Fresnel lens and projection display device using one such lens Fresnel lens and projection display device using one such lens

2011-08-30

2011-08-30

Mahoney, Christopher (Department: 2862)

Optical: systems and elements

Projection screen

Rear projection screen

C359S742000

Reexamination Certificate

active

08009354

ABSTRACT:
A Fresnel lens comprises at least one first prism and one second prism. Each prism has a first side and a second side which forms with a main axis an angle greater than that formed by the first side and the main axis. Conventionally, the second side of the first prism collimates the light received from a light source in line with the main axis. In order to improve the optical effectiveness, the second side of the second prism transmits the light received from the source in a first direction slightly different from the main axis.

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Patent Abstracts of Japan, vol. 2002, No. 12, Dec. 12, 2002 & JP 2002-221605 Search Report Dated Mar. 7, 2005.

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