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    • 7. 发明授权
    • Light guide plate and surface light source using the light guide plate
    • 导光板和表面光源使用导光板
    • US5999685A
    • 1999-12-07
    • US921606
    • 1997-09-02
    • Youichiro GotoMichiaki SatoYasuko TeragakiKatsutoshi HibinoKenji TorazawaMasahiro HiguchiTakanari Kusafuka
    • Youichiro GotoMichiaki SatoYasuko TeragakiKatsutoshi HibinoKenji TorazawaMasahiro HiguchiTakanari Kusafuka
    • F21V8/00
    • G02B6/0038Y10S385/901
    • A light guide plate is provided including a first lens portion comprising a plurality of recessed or projected lenticular unit lenses formed of the same resin as that of the light guide plate on a light emission surface. The plurality of lenticular unit lenses in the first lens portion are triangular prism portions whose respective vertexes have an angle of 125.degree. to 165.degree. and are so arranged that their respective ridge lines are nearly parallel to each other. Such construction makes it possible to set the number of lenticular lens sheets used to one or to further eliminate the necessity of the lenticular lens sheets, so that the cost of parts and the fabrication cost of the light guide plate can be reduced. A second lens portion may be provided on a light reflective surface opposite to the light emission surface on which the first lens portion is disposed, the second lens portion including a plurality of recessed or projected lenticular unit lenses formed of the same resin as that of the light guide plate. Alternatively, a light guide plate is provided having a plurality of grooves with approximately equal groove widths formed on a surface opposite to a light emission surface, the grooves being arranged substantially parallel to each other and the spacing between the grooves narrowing as the distance from the light incident surface increases, with the spacing from the far end of one of the plurality of grooves proximate to the light incident surface to the near end of a groove adjacent thereto farther away from the light incident surface being 5 to 15 times the groove width.
    • 提供了一种导光板,包括:第一透镜部分,包括由与发光表面上的导光板相同的树脂形成的多个凹入或突出的双凸透镜单元透镜。 第一透镜部分中的多个透镜单元透镜是三角形棱镜部分,其各自的顶点具有125°至165°的角度,并且被布置成使得它们各自的脊线彼此几乎平行。 这样的结构使得可以将使用的双凸透镜片的数量设置为一个,或者进一步消除双凸透镜片的必要性,从而可以减少导光板的部件成本和制造成本。 第二透镜部分可以设置在与其上设置有第一透镜部分的光发射表面相对的光反射表面上,第二透镜部分包括由与第一透镜部分相同的树脂形成的多个凹入或突出的双凸透镜单元透镜 导光板。 或者,导光板设置有多个槽,其在与发光表面相对的表面上形成有大致相等的槽宽,所述槽基本上彼此平行地布置,并且槽之间的间距随着距离 光入射面增加,与多个凹槽中的一个接近光入射表面的远端的距离相对于与光入射表面相邻的凹槽的近端的距离为凹槽宽度的5至15倍。