| 摘要 |
An image reading apparatus includes a reading unit for reading the image and a stepping motor for moving the reading unit. The stepping motor is excited and driven in one of a plurality of phase excitation modes each causing a different amount of movement per unit synchronizing signal. A phase excitation mode is selected from the plurality of phase excitation modes corresponding to an enlargement or reduction ratio of the image to alter the moving speed of the reading unit corresponding to the rotation speed of the stepping motor. |
