| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a surface light source capable of emitting light forward from a light emitting element disposed on its side as light of sufficient intensity having a uniform intensity distribution. <P>SOLUTION: A reflector 16 is provided in the back side of a light guide plate 11, whereof one end surface is formed as an incident end surface 12 and the front surface is formed into a stepped surface, and which leads the light entering from the incident end surface 12 to emit it from a plurality of the stepped surfaces 13 on the front surface, a light emitting element 17 is disposed by making it face the incident end surface 12 of the light guide plate 11, a diffusing means 18 is provided on the front side of an end part region in a range set apart from the incident end surface 12 of the light guide plate 11 by at least the height of the incident end surface 12 or more, and an optical member 20 to refract light emitted from a plurality of the stepped surfaces 14 of the light guiding plate in the direction whereon its angle made to the stepped surface 14 becomes small is disposed on the front side of the light guide plate 11 by making it face the part other than the end part region. <P>COPYRIGHT: (C)2004,JPO |
