发明名称 Surface light source device and illumination unit
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>
申请公布号 EP2264487(B1) 申请公布日期 2014.06.11
申请号 EP20100182640 申请日期 2005.07.14
申请人 ENPLAS CORPORATION 发明人 OHKAWA, SHINGO
分类号 G02B3/00;G02F1/13357 主分类号 G02B3/00
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