Patent ID: 8848262

Claim:
An optical radiation device comprising: a light source unit of a long length in which light emitting elements are arranged in an array to radially project light beams; a substrate of a long length on which the light source unit is mounted; an optical guide that is long in a same direction as the substrate and made from a translucent material to guide the light beams from the light emitting elements in a certain direction to project the light beams to a predetermined plane; and an optical collector to collect the light beams reflected by the predetermined plane, wherein a length of an effective read area from a reading center of the optical collector to a first end of the predetermined plane is different from a length of an effective read area from the reading center to a second end of the predetermined plane, and wherein the optical guide is formed by injection molding, includes a gate at a first optical guide end in a length direction and a surface at a second optical guide end formed to exert total reflection, and is disposed so that the gate is positioned on a same side as one of the effective read areas having a shorter length.