Patent ID: 6956685
Filing Date: 2005-10-18
Classification: B41J,G02B,Y10S

Abstract:
1. A method of detecting a synchronizing beam for controlling optical write-in starting of each beam for scanning each scanning line in a multi-beam scanner, the method comprising the steps of: deflecting each of beams emitted from a plurality of light sources and modulated independently according to an image signal by a common deflector at an equiangular velocity toward a scanned surface, and converging the deflected beam toward the scanned surface by a scanning image-forming optical system including lenses so as to be formed into a plurality of light spots on the scanned surface, separated from each other in a sub-scanning direction, to simultaneously scan a plurality of scanning lines by use of the plurality of light spots; and sequentially guiding each deflected beam by a synchronizing beam optical system of a synchronization detecting system toward a light receiving device of the synchronization detecting system so as beam, the synchronization detecting system reducing the value of a parameter d