Image reading device, image forming apparatus, image reading method
AssigneeKYOCERA Document Solutions Inc.
InventorShinichi Kawaguchi
Life of this patent
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Abstract
In an image reading device, a sync signal outputting portion alternately outputs a first sync signal and a second sync signal while the document sheet is moving in a range including a first position and a second position in a conveyance path. A first image sensor and a second image sensor read images from both sides of a document sheet and output image signals in synchronization with the first sync signal and the second sync signal, respectively. An AFE performs a predetermined signal processing in sequence to the image signals that are output alternately.
Claims7
An image reading device comprising:
- a document sheet conveying portion configured to convey a document sheet along a predetermined document sheet conveyance path;
- a sync signal outputting portion configured to, in a double-side mode, alternately output a first sync signal and a second sync signal while the document sheet is moving in a range including a first position and a second position in the document sheet conveyance path, the double-side mode being a mode in which images on both sides of the document sheet are read;
- a first image sensor configured to read an image from a first surface of the document sheet at the first position and output a first image signal corresponding to the image read at the first position, in synchronization with the first sync signal;
- a second image sensor configured to read an image from a second surface of the document sheet at the second position and output a second image signal corresponding to the image read at the second position, in synchronization with the second sync signal;
- and
- an image signal processing portion configured to perform a predetermined signal processing in sequence to the first image signal and the second image signal that are output alternately from the first image sensor and the second image sensor.
An image reading method for reading images from both sides of a document sheet conveyed along a predetermined document sheet conveyance path, the image reading method comprising:
- alternately outputting a first sync signal and a second sync signal by a sync signal outputting portion while the document sheet is moving in a range including a first position and a second position in the document sheet conveyance path;
- reading, by a first image sensor, an image from a first surface of the document sheet at the first position and outputting a first image signal corresponding to the image read at the first position, in synchronization with the first sync signal;
- reading, by a second image sensor, an image from a second surface of the document sheet at the second position and outputting a second image signal corresponding to the image read at the second position, in synchronization with the second sync signal;
- and
- performing, by an image signal processing portion, a predetermined signal processing in sequence to the first image signal and the second image signal that are output alternately from the first image sensor and the second image sensor.
Dependencies are inferred from the claim text.