发明名称 |
Surface light source device, and liquid crystal display device, sign display apparatus and traffic sign display apparatus using the surface light source device |
摘要 |
A surface light source device, comprising a light source (2); a light conductor (1) which has a light incident face (11) on at least one side end surface thereof which confronts the light source (2), and a light emitting face (12) on one surface thereof which is substantially perpendicular to the light incident face (11); and a light angle varying sheet (3) which is disposed at a side of the light emitting face (12) of the light conductor (1), wherein at least one of the light emitting face (12) and a back surface (13) of the light conductor (1) comprises a minute structure having an average slant angle of 0.5 to 7.5 degrees. The light angle varying sheet (3) may comprise a prism sheet having a plurality of prisms (31) which are formed parallel to one another on at least one surface thereof. The minute structure may comprise a roughened surface which includes a plurality of fine convex members each having a substantially spherical surface or a plurality of prism arrays having slant surfaces which extend parallel to said light incident face (11) and which have an average slant angle of 0.5 to 7.5 degrees.
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申请公布号 |
US6332691(B2) |
申请公布日期 |
2001.12.25 |
申请号 |
US20010834899 |
申请日期 |
2001.04.16 |
申请人 |
MITSUBISHI RAYON CO., LTD. |
发明人 |
ODA MASAHARU;CHIBA ISSEI;HAYASHI YASUKO |
分类号 |
F21V8/00;G02B6/00;(IPC1-7):F21V8/00 |
主分类号 |
F21V8/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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