Patent ID: 7348723

Claim:
An emission device comprising a light flux control member provided with a recess and an light control emission face, and a light emitting element accommodated in said recess, said light emitting element emits light which is emitted from said light control emission face after travelling within said light flux control member, wherein said light control emission face is configured so as to satisfy the following Conditions 1 and 2 for at least light which is emitted toward within a half-intensity-angular-range around a maximum-intensity-emission-direction from said light emitting element; Condition 1: Relation θ 5 /θ 1 >1 is satisfied except for light emitted toward within an angular-neighborhood of a standard optical axis of said emission device; Condition 2: Value of θ 5 /θ 1 decreases gradually according to increasing of θ 1 ; where θ 1 is an emission angle of any light at being emitted from said light emitting element, and θ 5 is an emission angle of that light of θ 1 at then being emitted from said light control emission face of said light flux control member.