| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polygon mirror drive motor that prevents detection accuracy of a synchronous signal from lowering due to variance in the synchronous signal itself caused by the installation errors of various components, and that detects a signal for accurately controlling the emission timing of a laser beam outgoing from a laser beam source as a result, and also to provide a laser mirror irradiation unit equipped with the polygon mirror drive motor. <P>SOLUTION: The polygon mirror drive motor is provided with: a frequency generation magnetizing part (FG magnet 7); a frequency generation pattern (FG pattern 6); and a divided frequency circuit 24. Using the divided frequency circuit 24, a signal detected in the frequency generation pattern (FG pattern 6) at the time of revolution of the frequency generation magnetizing part (FG magnet 7) is outputted in divided frequency in the number of mirror faces of the polygon mirror 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
