Patent ID: 8279501

Claim:
A scanning apparatus for scanning a document to acquire a document image, said scanning apparatus comprising: a glass platform for placing said document; and a scanning module for scanning said document to acquire said document image, said scanning module comprising: plural light emitting diodes for emitting light beams; a porous reflective plate arranged beside said plural light emitting diodes, and comprising plural first openings and plural second openings, wherein each first opening and each second opening are arranged at locations relevant to a corresponding light emitting diode, said second opening is arranged beside said first opening, and said first opening is smaller than said second opening, wherein said light beams penetrated through said plural first openings and said plural second openings are defined as penetrated light beams, and said light beams unable to penetrate through said plural first openings and said plural second openings are reflected by said porous reflective plate and defined as reflected light beams; and a reflective element for receiving and reflecting said reflected light beams from said porous reflective plate, so that said reflected light beams reflected by said reflective element are projected on said document, wherein said penetrated light beams are diffracted by said first openings and said second openings so as to be uniformly projected on said document.