| 摘要 |
A surface light source equipment includes a light emission part 22 , in which LED or the like is used, and a light conductive plate 23 that conducts a light outgoing from the light emission part 22 to spread the same over a whole light outgoing surface, wherein a multiplicity of deflection patterns 34 are provided on a back surface of the light conductive plate 23 and a light in the light conductive plate 23 is reflected by the deflection patterns 34 to outgo from the light outgoing surface of the light conductive plate 23 . Here, giving a thought to polar coordinates, of which an origin corresponds to a central point set in the vicinity of one corner of the light conductive plate, an arrangement point (Rm, thetam) of the deflection patterns is represented by the following formula: Rm=Rm-1+(1/Rm-1); thetam=thetam-1+137.5°; (however, Ro>0).
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