Patent ID: 6927880

Claim:
An image reading device for reading an image of an original mounted on an original mounting base by using optical scanning means which is subjected to acceleration drive along said original image mounting base until a velocity according to a reading magnification is obtained and then scanned by uniform velocity drive, the image reading device comprising: a stepping motor which moves said optical scanning means; reading magnification accepting means which accepts a reading magnification of an image of the original mounted on said original mounting base; motor drive controlling means which controls drive of said stepping motor, and obliquely increases a set electric current value during acceleration drive every velocity that said optical scanning means reaches by a pulse number according to the reading magnification accepted by said reading magnification accepting means and changes the set electric current value when shifting to uniform velocity drive in accordance with the reading magnification so as to provide a characteristic for lowering the set electric current value; and photoelectric converting means which converts a quantity of reflected light when optically scanning the original on said original mounting base by said optical scanning means moved by said stepping motor into an electrical signal.