There is disclosed an illumination device in which a light guide is adapted to emit the light from a face thereof and is provided with an area, on a face opposite to the light emitting face, for diffusing and/or reflecting the light introduced into the light guide from an end face thereof or is provided...http://www.google.es/patents/US7057778?utm_source=gb-gplus-sharePatente US7057778 - Light guide, illuminating device having the light guide, and image reading device and information processing apparatus having the illuminating device
Light guide, illuminating device having the light guide, and image reading ...
