Patent application number | Description | Published |
20100177364 | IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS - An image reading apparatus includes a drive unit that drives the line image sensor by frequency-modulated clock; a signal generating unit that generates an analog signal according to a change in frequency of the frequency-modulated clock; an amplification-inversion unit that amplifies the analog signal with an arbitrary amplification factor, and configured to switch between inversion and non-inversion; and a signal superimposing unit that superimposes between the analog image signal and an analog signal output from the amplification-inversion unit. | 07-15-2010 |
20110063689 | IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS - An image reading apparatus includes: a frequency modulation unit that generates a clock whose frequency is modulated by an arbitrary modulation cycle; a modulation cycle setting unit that sets the modulation cycle; a driving unit that drives the photoelectric conversion element by the clock; a signal generating unit that generates an analog signal corresponding to a frequency change of the clock; an amplification inversion unit capable of amplifying an alternating current component of the analog signal with an amplification factor corresponding to a setting value set externally, and capable of switching between inversion and non-inversion; a signal superimposing unit that superimposes the analog image signal on an analog signal output from the amplification inversion unit; and a controlling unit that calculates a feature amount, and that controls the amplification factor and the inversion or the non-inversion of the amplification inversion unit based on a calculation result. | 03-17-2011 |
20110063693 | IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS - An image reading apparatus includes: a driving unit that drives a photoelectric conversion element by a clock; a signal generating unit that generates an analog signal; an amplification inversion unit that amplifies an alternating current component of the analog signal with an amplification factor by a setting value that is set from outside, and that switches the alternating current component between inversion and non-inversion; a signal superimposing unit that superimposes the analog image signal on an analog signal that is output from the amplification inversion unit; and a controlling unit that converts analog image signal that is superimposed by the signal superimposing unit into a digital image signal by using the analog-digital converter, and that controls the amplification factor and the inversion and non-inversion of the amplification inversion unit based on a feature amount that appears on the digital image signal. | 03-17-2011 |
20130163018 | IMAGE READING DEVICE AND IMAGE FORMING APPARATUS - In an embodiment, provided is an image reading device that includes: a light source that includes a first block and a second block arranged alternately, both blocks including light-emitting elements arranged linearly, the first and the second block lighting independently, and the light-emitting elements in a same block of the first and the second block lighting at a same time; a scanning unit that scans a document by irradiating the document with light from the light source; a lighting control unit that lights one of the first and the second block of the light source and then lights the other; a peak level acquiring unit that acquires a peak level of scanned data of each of the first and the second block; and an abnormality determining unit that determines that the light-emitting element is abnormal when the peak level becomes equal to or smaller than a given value. | 06-27-2013 |