Title:
光学シート、バックライトおよび液晶表示装置
Document Type and Number:
Japanese Patent JP5272309
Kind Code:
B2
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 satisfies Z = X 2 / ( R + ¢ R 2 - ( 1 + K ) X 2 ) + AX 4 + BX 5 + CX 6 + ¯
(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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Inventors:
Yoshio Arima
Jun Shimizu
Hirokazu Odagiri
Eiji Ota
Kei Obata
Jun Shimizu
Hirokazu Odagiri
Eiji Ota
Kei Obata
Application Number:
JP2006537864A
Publication Date:
August 28, 2013
Filing Date:
September 30, 2005
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G02B3/00; F21S2/00; F21V5/00; F21V5/04; G02B3/02; G02B3/06; G02B5/02; G02B5/04; G02F1/1335; G02F1/13357; F21Y101/00; F21Y103/00
Domestic Patent References:
| JPH06301035A | 1994-10-28 | |||
| JPH10283818A | 1998-10-23 | |||
| JPH0915730A | 1997-01-17 | |||
| JPH02214287A | 1990-08-27 | |||
| JPH0921907A | 1997-01-21 | |||
| JPH07151909A | 1995-06-16 |
Attorney, Agent or Firm:
Masatomo Sugiura
Takuma Sugiura
Takuma Sugiura