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    • 9. 发明申请
    • PLANAR LIGHT SOURCE DEVICE
    • 平面光源设备
    • US20110228558A1
    • 2011-09-22
    • US13130758
    • 2009-10-13
    • Tatsuo UchidaYoshito SuzukiTohru KawakamiTakahiro IshinabeBaku KatagiriYoshihiro HashimotoShoichi IshiharaShuichi KozakiYutaka Ishii
    • Tatsuo UchidaYoshito SuzukiTohru KawakamiTakahiro IshinabeBaku KatagiriYoshihiro HashimotoShoichi IshiharaShuichi KozakiYutaka Ishii
    • F21V7/22
    • G02B6/0055G02B6/0031G02B6/0046G02B6/0053
    • Conventional planar light source devices have a problem that increasing a utilization ratio of light results in a very narrow angle distribution of light. A planar light source device of the present invention has a light source (1), a light guide plate (2) for introducing light coming from the light source via a light-incident plane of the light guide plate and emits the light from almost all area of a light emission plane, and a light source side reflector (3) for reflecting the light coming from the light source and light which comes from the light source and is reflected by the light-incident plane of the light guide plate so that the reflected light is emitted to the light-incident plane of the light guide plate. The planar light source device further includes a lower side reflector (5) for introducing light emitted from the lower plane of the light guide plate into the light guide plate again, and an optical member (4) for changing a traveling direction of first light (10) which is introduced via the light-incident plane to pass through the light guide plate and is emitted from an upper plane of the light guide plate to a vertical upper direction. The lower side reflector is inclined by an angle of 5°-60° with respect to the lower plane of the light guide plate, and θ2=90°−θ1±10° is met where θ1 (°) represents a maximum angle between the upper plane and a direction in which the first light is emitted from the upper plane and θ2 (°) represents an apex angle of the optical member.
    • 传统的平面光源装置具有提高光的利用率导致光的非常窄的角度分布的问题。 本发明的平面光源装置具有:光源(1),导光板(2),用于经由导光板的入射面导入来自光源的光,并从几乎全部发射光 光源侧反射器(3),用于反射来自光源的光和来自光源的光,并被导光板的光入射面反射,使得 反射光被发射到导光板的光入射面。 平面光源装置还包括用于将从导光板的下平面发射的光再次引入导光板的下侧反射器(5),以及用于改变第一光的行进方向的光学部件(4) 10),其经由光入射面引入以穿过导光板,并且从导光板的上平面发射到垂直上方。 下侧反射器相对于导光板的下平面倾斜5°-60°,和2θ= 90° - 角度; 1±10°,其中&1;(°) 表示上平面与第一光从上平面发射的方向和角度之间的最大角度; 2(°)表示光学构件的顶角。