Patent ID: 9300832
Filing Date: 2016-03-29
CPC Classification: H04N

Claim Text:
1. An image reader comprising: a first image reading unit that reads first image data by scanning one surface of a document at a first resolution corresponding to a magnification ratio and a predetermined first scan cycle; and a second image reading unit that accumulates light radiated from a light source and reads second image data by scanning other surface of the document at a fixed second resolution and a second scan cycle corresponding to the magnification ratio, wherein the second image reading unit controls light accumulation time of the light radiated from the light source to be constant, when the second scan cycle is changed according to the magnification ratio, wherein the second image reading unit controls the light accumulation time to be less than or equal to a lower limit of the second scan cycle, and wherein the second image reading unit scans one line on the other surface of the document according to a line synchronization signal input thereto for each second scan cycle, and lights the light source according to a lighting signal started to be input in synchronization with the line synchronization signal and finished to be input at less than or equal to the lower limit.