Patent ID: 8427715
Filing Date: 2013-04-23
Classification: H04N

Abstract:
1. An image reading apparatus that converts light reflected from an original into an analog image signal by a photoelectric conversion element, that converts the obtained analog image signal to which analog signal processing is applied into a digital image signal by an analog-digital converter, and that outputs the digital image signal, the image reading apparatus comprising: a frequency modulation unit that generates a clock whose frequency is modulated by an arbitrary modulation cycle relative to a reference clock; a modulation cycle setting unit that sets the modulation cycle; a driving unit that drives the photoelectric conversion element by the clock whose frequency is modulated; a signal generating unit that generates an analog signal corresponding to a frequency change of the clock whose frequency is modulated; an amplification inversion unit a signal superimposing unit that superimposes the analog image signal on an analog signal output from the amplification inversion unit; and a controlling unit