| 摘要 |
A light guide plate (63) is composed of a light introducing section (65), which is at a position facing a point light source (62), for confining light from the point light source; and a light guide plate main body (64), which has a thickness smaller than that of an edge of the light introducing section on the point light source side and outputs the confined light to the external from a light outputting surface by a light outputting means (70). The light introducing section (65) has an inclined surface (67) which is inclined from the surface of the light introducing section to the surface of the light guide plate main body (64). The inclined surface (67) has a directivity converting pattern (68) for converting directivity expansion, which is of light inputted to the light introducing section (65) and in the light guide plate thickness direction, into a directivity characteristic of inclining toward a direction parallel to the light guide plate surface direction. The directivity converting pattern (68) has a structure wherein a plurality of V-shaped groove structures (68a) are arranged.
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