Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yuzo Nakano0
Hayato Takeuchi0
Kuniko Kojima0
Norihiro Watanabe0
Takao Endo0
Date of Patent
January 18, 2011
0Patent Application Number
122892820
Date Filed
October 23, 2008
0Patent Citations Received
Patent Primary Examiner
Patent 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, δ1, 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.
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