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    • 4. 发明授权
    • Surface light source device
    • 表面光源装置
    • US08199278B2
    • 2012-06-12
    • US13057184
    • 2009-08-04
    • Tatsuo UchidaYoshito SuzukiTohru KawakamiTakahiro IshinabeBaku KatagiriYoshihiro HashimotoShoichi IshiharaShuichi KozakiYutaka Ishii
    • Tatsuo UchidaYoshito SuzukiTohru KawakamiTakahiro IshinabeBaku KatagiriYoshihiro HashimotoShoichi IshiharaShuichi KozakiYutaka Ishii
    • G02F1/1335
    • G02B6/0068G02B6/002G02B6/0046G02B6/0055
    • Surface light source device includes: point light sources (13); light guide plate (1) having (i) two end parts in length direction, one of which serves as incident surface (2), and (ii) two end parts in thickness direction which serve as exit surface (7) and back surface (8), light guide plate (1) directing light, emitted from point light sources (13), incident on incident surface (2), so as to cause light to exit from substantially entire area of exit surface (7); and reflector (14) which reflects, toward incident surface (2), part of light which is emitted from point light sources (13) and is then reflected from incident surface (2). Incident surface (2) has elliptic arc (10) which is concave part having surface shape along elliptic arc identical to elliptic arc which is part of ellipse (31) having two focal points corresponding to point light sources (13) and reflector (14). Point light sources (13) and reflector (14) are provided on ellipse focal point lines (11 and 12) obtained by moving two focal points in width direction of light guide plate (1).
    • 表面光源装置包括:点光源(13); 导光板(1)具有(i)长度方向的两个端部,其中一个用作入射表面(2),和(ii)作为出射面(7)和后表面(7)的厚度方向的两个端部 8),引导从点光源(13)射出的入射到入射面(2)的光的导光板(1),使光从出射面(7)的大致整个区域射出; 和反射器(14),其朝着入射面(2)反射从点光源(13)发射的光的一部分,然后从入射面(2)反射。 入射面(2)具有椭圆弧(10),其具有与椭圆弧相同椭圆弧的椭圆弧的表面形状的椭圆弧(10),椭圆弧是具有对应于点光源(13)和反射器(14)的两个焦点的椭圆(31)的一部分, 。 点光源(13)和反射器(14)设置在通过在导光板(1)的宽度方向上移动两个焦点而获得的椭圆焦点线(11和12)上。