Patent ID: 7002711
Filing Date: 2006-02-21
Classification: H04N

Abstract:
1. An image reading device operable in a manually placed document reading mode offered by a manually placed document reading means which reads a document placed on a document table made of transparent glass by means of a scannig carriage which moves at a predetermined speed and an ADF document reading mode offered by an ADF document reading means which reads a document transported by an ADF by means of the scanning carriage which has been in a stopping state, comprising: reading mode detecting means which detects in which mode of the manually placed document reading mode and the ADF document reading mode a document to be read is in; first reading-speed setting means which sets a reading speed of the ADF document reading means defined by a document transportation speed by the ADF to a predetermined first reading speed, upon detection by the reading mode detecting means that the document to be read is in the ADF document reading mode; and second reading-speed setting means which sets a reading speed of the manually placed document reading means defined by a moving speed of the scanning carriage to a predetermined second reading speed sufficient to reduce image vibration in a result of reading by the manually placed document reading means, upon detection by the reading mode detecting means that the document to be read is in the manually placed document reading mode, wherein the first reading-speed setting means changes the predetermined first reading speed defined by the document transportation speed by the ADF to be a high speed that enables a required number of sheets to be read per unit time, and the second reading-speed setting means changes the predetermined second reading speed defined by the moving speed of the scanning carriage to be a speed slower than the predetermined first reading speed.