US 6,580,528 B1 · Image reading device

Abstract

A reading scan controlling unit drives a scanning motor in accordance with a signal from a reading instructing unit and a line synchronous generating unit for scanning a document plural times in a slow-scanning direction, as well as controls a sensor driver to read a document image. At this time, an optical flat plate driving unit is controlled in the second and following scans to incline an optical flat plate provided in an imaging optical path at a predetermined angle in a fast-scanning direction, so that the imaging position on a CCD sensor in a fast-scanning direction is slightly changed. Further, the scanning speed is determined in accordance with the scanning times. An image reading device having such a construction can perform high-speed reading with high precision by using an image shift method.

Claims17

Dependent claims

An image reading device comprising:

a reading part that reads an optical image of an object to be read;
a moving part that moves in a slow-scanning direction a reading position of the object to be read by the reading part;
a scan controlling part that scans the object to be read plural times by controlling the moving part;
a reading position changing part that changes in a fast-scanning direction the reading position of the object to be read by the reading part for every scan by the scan controlling part;
and
a moving speed changing part that changes the moving speed of the reading position by the moving part in accordance with the number of scanning times by the scan controlling part.

3 more elements

Dependencies are inferred from the claim text.

Image reading device

Life of this patent

Image reading device

Life of this patent

Abstract

Claims17