Synchronizing signal generating system for laser scanner

A synchronizing signal generating system for a laser scanner, said synchronizing signal generating system comprising:

• first means for emitting a first laser beam for recording information on a medium and for emitting a second laser beam for synchronization of a scan by said first laser beam;
• second means for scanning said medium by said first laser beam;
• third means for scanning a grating by said second laser beam, said grating having bright portions and dark portions alternately arranged along a scanning direction of said second laser beam;
• a converging optical system including a plurality of light converging elements aligned so as to cover a width of scan by said second laser beam measured on said grating, wherein the first width of scan, by said second laser beam is larger than the width of scan, by said first laser beam, when measured on the same plane, said plurality of light converging elements converging said second laser beam transmitted through said grating;
• a light receiving system for receiving said second laser beam converged by said converting optical system and for generating a synchronizing signal;
• and
• fourth means for controlling said first means responsive to said synchronizing signal so as to synchronize a scan timing of said first laser beam.