Patent ID: 7734224
Filing Date: 2010-06-08
Classification: H04N

Abstract:
1. An image reading apparatus, comprising: a first running device configured to move to scan a document in a scanning direction with a predetermined speed and includes: an illumination unit configured to illuminate the document at different direction from the scanning direction, and a first mirror configured to reflect a reflected light from the document illuminated by the light from the illumination unit; a second running device configured to move in the scanning direction parallel to the first running device with half speed of the first running device and includes: a second mirror configured to reflect the light reflected by the first mirror, and a third mirror configured to reflect the light reflected by the second mirror parallel to the scanning direction; an imaging lens configured to produce a reduced image by receiving the reflected light from the third mirror; and a line sensor configured to convert the reduced image to an electrical signal, wherein a maximum readable size of the document satisfies a formula, where Lmax is the maximum readable size of the document, R