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Patent attributes
Current Assignee
0
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hirokazu Odagiri0
Mitsuo Arima0
Kei Obata0
Eiji Ohta0
Jun Shimizu0
Date of Patent
April 13, 2010
0Patent Application Number
105987250
Date Filed
September 30, 2005
0Patent Primary Examiner
Patent abstract
An optical sheet has a large number of cylindrical lens elements provided successively on one of principal faces thereof. The cylindrical lens elements have a finite focal distance on the emission side of illumination light and have an aspheric face of a leftwardly and rightwardly symmetric sectional shape. Where a Z axis is taken in parallel to a normal line direction to the optical sheet and an X axis is taken in a direction of the row of the cylindrical lens elements, a cross sectional shape of the cylindrical lens elements satisfiesZ=X2/(R+√{square root over ( )}(R2−(1+K)X2))+AX4+BX5+CX6+ . . .(where R is the radius of curvature of a distal end vertex, K is a conic constant, and A, B, C, . . . are aspheric coefficients).
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