Patent ID: 7274493
Filing Date: 2007-09-25
Classification: H04N

Abstract:
1. An image forming apparatus comprising an image reading section configured to optically read an original by driving a scan optical system using a pulse controlled motor, the apparatus comprising: a setting section which sets a magnification of image, such as a magnification for enlargement of image, a magnification equal to a size of the original, or a magnification for reduction of image; a scanner CPU which selects a microstep division number, which prevents the motor from being driven in resonance regions corresponding to different microstep division numbers of the motor, when the motor drives the scan optical system in accordance with the magnification of image, such as a magnification for enlargement of image, a magnification equal to a size of the original, or a magnification for reduction of image, said scanner CPU controlling microstep driving of the motor, using the microstep division number selected by the scanner CPU; and an image forming section which forms an image based on image data on the original read by the image reading section controlled by the scanner CPU.