| 摘要 |
Light flux control member 4 receives light from at least one LED 5 , letting the light be emitted from emission face 4 b. Light flux control member 4 is provided with recess 7 corresponding to each LED 5 . Each recess 7 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 from corresponding LED 5. Condition 1: Relation theta 5/theta1 >1 is satisfied except for light emitted toward within an angular-neighbourhood of a normal direction with respect to emission face 4 b; Condition 2; Value of theta 5/theta1 decreases gradually according to increasing of theta 1; (where theta 1 is an emission angle of any light at being emitted from LED 5 ; and theta 5 is an emission angle of that light at then being emitted from emission face 4 b.) If a plurality of LEDs are employed, differences in emitting color among individual LEDs are made less conspicuous and uniform illumination free from uneven brightness is realizable.
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