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    • 5. 发明申请
    • LIGHT GUIDE AND LINE ILLUMINATOR
    • 导光板和照明灯
    • WO2005001529A9
    • 2005-07-14
    • PCT/JP2004008623
    • 2004-06-18
    • NIPPON SHEET GLASS CO LTDIKEDA MAKOTONEMOTO HIROYUKI
    • IKEDA MAKOTONEMOTO HIROYUKI
    • G02B6/00H04N1/031F21V8/00H04N1/028H04N1/04
    • H04N1/0318G02B6/00H04N2201/03112H04N2201/03125H04N2201/03141H04N2201/03145H04N2201/0317
    • [PROBLEMS] A light guide and a line illuminator incorporating it in which the deterioration of a read out image can be suppressed even when the document surface is floating by spreading the intensity distribution of light in the longitudinal direction at a position (document position) of an article being illuminated. [MEANS FOR SOLVING PROBLEMS] In a light guide (10) arranged such that a light entering from the end face exits from an exit face provided along the longitudinal direction while reflecting off the inner surface, a side face shape orthogonal to the longitudinal direction has a curved surface (1) of first elliptic arc, a curved surface (2) of second elliptic arc, a first exit face (3), a second exit face (4), and a light scattering part (5) formed at an elliptic focal position (or in the vicinity thereof) on the major axis plane of each ellipse. Condensing position of a light reflected off the first curved surface is different from the condensing position of a light reflected off the second curved surface.
    • [问题]本发明提供一种光导和线照明装置,其中通过将光的强度分布在长度方向上扩展到原稿的位置(原稿位置),即使当原稿表面浮动时,也可以抑制读出图像的劣化 一件物品被照亮。 解决问题的手段在从端面入射的光从沿着长度方向设置并从内面反射的出射面射出的光导(10)中,与长度方向正交的侧面形状具有 第一椭圆弧的曲面(1),第二椭圆弧的曲面(2),第一出射面(3),第二出射面(4)以及形成为椭圆形的光散射部(5) 在每个椭圆的主轴平面上的焦点位置(或其附近)。 从第一曲面反射的光的聚光位置不同于从第二曲面反射的光的聚光位置。