| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a luminous flux control member, a light emitting device and a surface light source apparatus, which achieve improvement of uniformity of brightness during usage as a surface light source. <P>SOLUTION: A luminous flux control member includes: a first incidence plane 19 configured to enter first light on a center side from a light emitting device 12; a second incidence plane 20 configured to enter second light on the outside of the first light; a first total internal reflection plane 17 configured to subject the second light entered the second incidence plane 20 to total internal reflection; a second total internal reflection surface 16 configured to subject the first light from the first incidence plane 19 and the second light from the first total internal reflection plane 17 to total internal reflection toward both sides having plane symmetry with a predetermined plane as a symmetry plane; and a first emission plane 31 and a second emission plane 32 respectively configured to emit first and second lights after being subjected to the total internal reflection by the second total reflection surface 16. The two emission planes 31 and 32 are made into a shape that allows emission of the first and second lights after being subjected to the total internal reflection by the second total reflection surface 16 in a state in which the first and second lights are diverged. <P>COPYRIGHT: (C)2013,JPO&INPIT |
