Patent Number: 6,295,116

Title: Optical scanning system for printer

Abstract: An optical scanning system for a printer includes an optical scanning unit having a deflector divided into a plurality of deflection regions to allow repetitive scanning of light emitted from a light source by rotation, the optical scanning unit for scanning light onto a photosensitive belt traveling around a plurality of rollers; a first photodetector installed at a position separated from the edge of the photosensitive belt, to be able to receivable light scanned beyond the edge of the photosensitive belt; a second photodetector installed a predetermined distance apart from the first photodetector, to be able to receive light scanned just beyond the edge of the photosensitive belt until the light hits the edge of the photosensitive belt; a scanning reference position signal generator for generating a scanning reference position signal at a point in time at which a signal output from the first photodetector in response to the reception of light, and a signal output from the second photodetector in response to the reception of light have the same level; an edge pulse generator for generating an edge pulse signal whose width corresponds to the period from the reception of the scanning reference position signal until the light reception of the second photodetector is terminated; and a controller for calculating the degree of deviation from a reference track of the photosensitive belt, in a direction perpendicular to the traveling direction of the photosensitive belt, using the width of the edge pulse signal, and controlling the driving of the optical scanning unit such that light corresponding to image information is emitted onto the photosensitive belt, starting from the starting point of an image print region of the photosensitive belt. The optical scanning system can reduce error in printing image information onto the image print region of the photosensitive belt even though there are variations in the amount of light scanning onto the photosensitive belt from the optical scanning unit.

Inventors: Eom; Yoon-seop (Suwon, KR)

Assignee: SamSung Electronics Co., Ltd.

International Classification: G06K 15/12 (20060101); H04N 1/047 (20060101); H04N 1/053 (20060101); H04N 1/113 (20060101); H04N 1/12 (20060101); G03B 027/32 (); G03B 027/52 (); H01J 003/14 (); B41J 002/01 (); G03G 015/04 ()

Expiration Date: 09/25/2018