Patent ID: 6559978
Filing Date: 2003-05-06
Classification: H04N

Abstract:
An image reader comprising:an image pick-up unit which reads an image from an original in a fast scanning direction in accordance with a fast scanning synchronizing signal of a predetermined cycle; a drive unit which causes the image pick-up unit and the image from the original to move in a slow scanning direction in accordance with a drive control signal asynchronous with the fast scanning synchronizing signal; an intermittent read instruction unit which generates a stop instruction and a restart instruction for allowing the image reading to be performed in the slow scanning direction by the image pick-up unit; a phase holding unit which recognizes and holds a phase difference between the fast scanning synchronizing signal and the drive control signal upon issuance of a stop instruction from the intermittent read instruction unit; and a phase correcting unit which, upon issuance of a restart instruction from the intermittent read instruction unit, corrects a phase difference between the fast scanning synchronizing signal and the drive control signal on the basis of the phase difference recognized and held by the phase holding unit.