LUMINOUS-FLUX CONTROL MEMBER, LIGHT EMISSION DEVICE, AND ILLUMINATION DEVICE

摘要

The present invention relates to a luminous-flux control member of which light distribution characteristics are hardly changed even if the luminous-flux control member is surrounded by a coking material. The luminous-flux control member has: an entrance surface disposed on the back side of the luminous-flux control member; two reflecting surfaces disposed on the front side of the luminous-flux control member so as to face each other; a groove including the two reflecting surfaces; two exit surfaces; and two walls covering the opening of the groove. The two walls decrease in thickness toward the front side in the extending direction of the groove.