The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2007
Filed:
Oct. 04, 2004
Hiroshi Suzuki, Tokyo, JP;
Takao Endo, Tokyo, JP;
Shinsuke Shikama, Tokyo, JP;
Kohei Teramoto, Tokyo, JP;
Hiroshi Suzuki, Tokyo, JP;
Takao Endo, Tokyo, JP;
Shinsuke Shikama, Tokyo, JP;
Kohei Teramoto, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Each of a plurality of Fresnel prismsis formed so that a refracting surfacethereof includes a non-light incidence surfaceupon which any ray of light emitted from a projectoris not directly incident because it is intercepted by another Fresnel prism, the non-light incidence surface having an angle τ' with a reflecting surfacewhich is different from the prism apex angle τ of each of the plurality of Fresnel prisms. As a result, a ray of light reflected by the refracting surfaceof each of the plurality of Fresnel prisms without passing through the refracting surface can be preventing from emerging, as unnecessary light, toward the viewer's line of sight.