摘要 |
<p>Light flux control member 4 receives light from at least one LED 5, letting the light be emitted from emission face 4b. 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 ¸5/¸1>1 is satisfied except for light emitted toward within an angular-neighbourhood of a normal direction with respect to emission face 4b; Condition 2; Value of ¸5 / ¸1 decreases gradually according to increasing of ¸1 ; €ƒ€ƒ€ƒ
(where ¸1 is an emission angle of any light at being emitted from LED 5; and ¸5 is an emission angle of that light at then being emitted from emission face 4b.) 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.</p> |