| 主权项 |
1. A light flux controlling member which controls a distribution of light emitted from a light-emitting element, the light flux controlling member comprising:
a first light flux controlling member on which at least part of light emitted from the light-emitting element is incident, the first light flux controlling member being configured to emit light incident on the first light flux controlling member while controlling the light incident on the first light flux controlling member such that the light incident on the first light flux controlling member has predetermined light distribution characteristics; a second light flux controlling member configured to reflect part of light arriving from the first light flux controlling member while allowing a remaining part of the light arriving from the first light flux controlling member to pass therethrough; and a holder configured to set positions of the first light flux controlling member and the second light flux controlling member, the holder having a light transmissivity and a substantially cylindrical shape, wherein the first light flux controlling member includes
an incidence surface on which at least part of light emitted from the light-emitting element is incident,a total reflection surface configured to reflect part of light incident on the incidence surface toward the second light flux controlling member, andan emission surface configured to emit part of light incident on the incidence surface and light reflected by the total reflection surface toward the second light flux controlling member, the second light flux controlling member includes a reflecting surface which faces the emission surface, the reflecting surface being configured to reflect part of light arriving from the first light flux controlling member, the reflecting surface is a surface rotationally symmetrical about a central axis of the holder, the reflecting surface being formed such that a generatrix of the rotationally symmetrical surface is a curved line recessed with respect to the first light flux controlling member, an external peripheral portion of the reflecting surface is formed at a location distant from the light-emitting element in a direction of an optical axis of the light-emitting element in comparison with a position of a center portion of the reflecting surface, a protrusion or a recess configured to change an emission direction of light passing through the holder is formed on an external peripheral surface of the holder, and the protrusion or the recess has a shape rotationally symmetrical about the central axis of the holder. |
