Patent ID: 6157472
Filing Date: 2000-12-05
Classification: G02B

Abstract:
A multi-laser scanning unit comprising:a driving source for providing a rotatory force;a deflection disk installed around a rotary shaft of the driving source, having at least two sectors with a hologram pattern for diffracting and deflecting incident light, for scanning light through rotation to result in a plurality of light scanning lines;at least two light sources installed facing one surface of the deflection disk, for irradiating light lines onto predetermined points in the at least two sectors of the deflection disk, the predetermined points being symmetrical by a rotary center of the deflection disk;light path changing means for changing traveling paths of the plurality of scanning lines formed by the rotation of the deflection disk, such that centers of the scanning lines or extended imaginary lines of the scanning lines, pass a rotary axis of the deflection disk; andscanning direction changing means for changing a scanning direction of one scanning line scanned by the deflection disk in an opposite scanning direction to said scanning direction, such that all the scanning lines scan an image in a same scanning direction.