| 摘要 |
PROBLEM TO BE SOLVED: To provide a luminous flux control member capable of controlling light distribution of light emitted from a light emitting element so that light distribution of the light can be made uniform and light can be radiated to a cover uniformly by a small number of light emitting elements.SOLUTION: A luminous flux control member includes: two incident surfaces arranged on both sides with a virtual plane including an optical axis of a light emitting element being a boundary; a first protrusion arranged between the two incident surfaces along the virtual plane, and for allowing the light emitted from the light emitting element to enter; two total reflection surfaces formed on the positions opposing to the light emitting element by sandwiching the incident surfaces; two light guide parts arranged at the positions facing by sandwiching the first protrusion; and emission surfaces formed on outer surfaces of the light guide parts. A second luminous flux control member has a luminous flux control member body which is arranged so as to cover the first protrusion, and which includes a diffuse transmission part for diffusing and transmitting the light made incident and emitted in the first protrusion.SELECTED DRAWING: Figure 2 |
