LUMINOUS FLUX CONTROL MEMBER, LIGHT EMITTING DEVICE AND LUMINAIRE

摘要

PROBLEM TO BE SOLVED: To provide a luminous flux control member capable of controlling distribution of light emitted from a light emitting element so that light can be radiated uniformly to a cover with a small number of light emitting elements.SOLUTION: A luminous flux control member has a first luminous flux control member and a second luminous flux control member. The luminous flux control member includes: an incident surface for making a part of light emitted from a light emitting element incident; two total reflection surfaces for reflecting the light made incident from the incident surface to the opposite directions; a slit arranged between the two total reflection surfaces and for making a part of light other than the light emitted from the light emitting element travel along an optical axis; a light guide part for guiding the light made incident in the incident surface and the light reflected on the total reflection surfaces; and an emission surface for emitting the light guided by the light guide part to the outside. The second luminous flux control member is arranged so as to cover the slit and includes a diffusion transmission part for diffusing and transmitting the light travelling in the slit.