| 摘要 |
<P>PROBLEM TO BE SOLVED: To diffuse light from a point light source in a wide range by a side end surface shape of a light guide plate as simple as possible. <P>SOLUTION: A plurality of linear projection parts 20 projecting from a side end surface of the light guide plate 12 and extending in the thickness direction of the light guide plate 12 are formed; and each of the linear projection part 20 is composed of a pair of flat surfaces 22 and 24 symmetrically tilting in the width direction of the linear projection part 20 and a curved surface 26 smoothly connecting the distal end sides of the pair of the flat surfaces 22 and 24. Brightness in the wide angle direction is ensured by a light ray L3 refracted on the flat surfaces 22 and 24. Brightness in the front direction of the point light source 14 is ensured by a light ray L4 entering into a flat part 28 and going straight ahead. Brightness in intermediate directions between L3 and L4 are ensured by light rays L1 and L2 entering into the curved surface 26. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
