A spread illuminating apparatus having a light conductive plate made of a light transmissible material and a bar-like lamp disposed along and close to an end face of the light conductive plate. The spread illuminating apparatus also having a light reflection pattern having a stair-like configuration...http://www.google.fr/patents/US6837588?utm_source=gb-gplus-shareBrevet US6837588 - Spread illuminating apparatus with means for reflecting light dispersely
Spread illuminating apparatus with means for reflecting light dispersely
