| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light guide member having high light emission efficiency and having small variations of illumination intensity. <P>SOLUTION: The light guide member 100 includes a light guide plate 300 having two opposite primary planes 310, 320 and two opposite light introduction surfaces 330, 350, and a light emission section made of a material which can scatter light and formed on the primary plane 310. A total S (%) of an occupation rate of the light emission section per unit area of two opposite primary planes 310, 320 at a section wherein a thickness of the light guide plate 300 is to be T and a distance between the two opposite light introduction surfaces 330, 350 is to be L and a distance to the nearer light introduction surface between two opposite light introduction surfaces 330, 350 on the primary planes 310, 320 is to be A, is to satisfy the following expression 1 at a region wherein A/L of the primary planes 310, 320 is in the range of 20 to 50%. <P>COPYRIGHT: (C)2013,JPO&INPIT |
