Apparatus for scanning an open book

摘要

A book (16) scanning unit has a reading head (20) with light sensor (10) and oblique viewing optical train comprising collimating (30) and objective (32) lenses with prisms (36) projecting the image of each side (12, 14) onto the sensor at an angle with correcting wedge lenses and prisms so that the entire page from fold (18) to edge (60) is sharp.