设计了一种新型的导光板.该导光板通过其侧表面的一部分将从光源发出的照明光引入导光板自身,并且通过形成在导光板的主表面上的发光部件将照明光引出导光板.导光板侧表面上的接收照明光的光接收表面相对于与所述主表面垂直的平面具有30°～60°的倾斜角,此外,光接收表面具有沿平行于主表面的方向延伸的凹槽.由此,被折射并被输入到导光板之中的照明光在被全内反射的同时,在导光板中传播,且可通过光输出部份将光有效地引出,从而提供了通过改善光利用效率来节省能量并减小厚度的导光板.当用于移动电话等电子设备时,这种导光板能够节省电能并降低移动电话的厚度.%A novel light guide plate is provided, which introduces thereinto illuminating light emitted from a light source through part of a side surface thereof and directs the illuminating light out of the light guide plate through light emitting parts formed in a main surface of the light guide plate, in which a light receiving surface for the illuminating light on the side surface is inclined in a range of 30 to 60 degrees relative to a plane perpendicular to the main surface, and the light receiving surface further includes a groove that extends in a direction substantially parallel to the main surface. Thus, illuminating light is refracted, enters the light guide plate,and propagates in the light guide plate while undergoing total internal reflection. Light can be effectively directed out of the light guide plate through the light emitting parts. Thus, a light guide plate with which power saving and reduction in thickness can be achieved by improving light efficiency. Besides, when the light guide plate is used in an electronic appliance, power can be saved and thickness of the can be reduced.
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