G - Physics – 03 – B
Patent
G - Physics
03
B
G03B 21/62 (2006.01) B29D 11/00 (2006.01) G02B 3/00 (2006.01) G02B 3/08 (2006.01)
Patent
CA 2103657
An optical element, such as a rear projection screen for an image display device, comprises at least two substantially rigid sheet members having each a first major surface and a second major surface providing a plane of incidence and a plane of emergence, respectively, through which light is transmitted sequentially. A first sheet member comprises a Fresnel lens, and a second sheet member comprises a lenticular lens array on each of the major surfaces thereof. The plane of emergence on the second major surface of the first sheet member includes the Fresnel lens formed of a radiation curable material. A method of making the Fresnel lens is described.
L'invention est constituée par un élément optique, tel qu'un écran de rétroprojection pour dispositif d'affichage d'images, comportant au moins deux feuilles substantiellement rigides ayant chacune une première surface et une seconde surface constituant respectivement un plan d'incidence et un plan d'émergence, à travers lesquelles la lumière est transmise de façon séquentielle. La première feuille comporte une lentille de Fresnel et la seconde, un réseau de lentilles lenticulaires sur chacune de ses surfaces. Le plan d'émergence de la seconde surface de la première feuille contient la lentille de Fresnel formée sur un matériau durcissable par irradiation. Une méthode de fabrication de la lentille de Fresnel est décrite.
Mcclelland Sandra Kay
Mccoy Randall Eugene
Rosati Dominic Stephen Jr.
Craig Wilson And Company
Rca Thomson Licensing Corporation
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