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:
Jan. 18, 2011
Filed:
Oct. 23, 2008
Kuniko Kojima, Tokyo, JP;
Hayato Takeuchi, Tokyo, JP;
Norihiro Watanabe, Tokyo, JP;
Yuzo Nakano, Tokyo, JP;
Takao Endo, Tokyo, JP;
Kuniko Kojima, Tokyo, JP;
Hayato Takeuchi, Tokyo, JP;
Norihiro Watanabe, Tokyo, JP;
Yuzo Nakano, Tokyo, JP;
Takao Endo, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
The Fresnel lens sheet according to the present invention has a plurality of prismatic Fresnel lens elements including a Fresnel facet, a riser facet, and a top facet crossing the facet and the riser facet on an entrance surface. An angle of the top facet of each Fresnel lens element constituting the lens relative to the an exit surface, δ, is determined so that an exit angle of the light that has entered each of the top facets and exits from the exit surface, β, is greater than 35 degrees.