1. A book scanner with a uniform light source having a housing, a carriage moving in reciprocating motion in said housing, an original placed on said book scanner and being scanned with a scanning module disposed in said carriage, comprising: a transparent platen disposed on a top of said housing, wherein said original is placed onto said transparent platen; and a light source having a substantially strip-shaped light tube disposed in said carriage and corresponding to said transparent platen, wherein a light beam from said light source transmitting through said transparent platen and illuminating said original, wherein said transparent platen comprises a first light transmission part and a second light transmission part, both said first and second light transmission parts are configured adjacently to form an angular structure, a crest line is formed along a joint of said first and second light transmission parts and said strip-shaped light source being lengthwise perpendicular to said crest line.