Patent ID: 8056807

Claim:
A light projecting apparatus of a scanner module, comprising: a base, comprising a reflecting condensing face; a substrate, positioned on one side of the reflecting condensing face; a plurality of light emitting diodes (LEDs), positioned on the substrate, adapted to generate a plurality of incident beams, project the plurality of incident beams to the reflecting condensing face, and reflect the plurality of incident beams over a scanned object through the reflecting condensing face; and a diffusion plate corresponding to the plurality of LEDs and adapted to receive the plurality of incident beams and diffuse the plurality of incident beams over the reflecting condensing face, the diffusion plate comprising: a plurality of second transverse concave portions, adapted to diffuse the plurality of incident beams; and a plurality of second transverse convex portions, adapted to gather the plurality of incident beams, the plurality of second transverse convex portions and the plurality of second transverse concave portions being interlaced in a transverse direction, allowing the plurality of incident beams to be diffused uniformly over the reflecting condensing face.