| 摘要 |
To enable preventing any unevenness in a synchronous signal itself from being caused owing to errors of placement of various components so as to deteriorate a detection accuracy; and by applying the above measures, consequently to provide a polygon mirror drive motor, with which it is possible to detect a signal for accurately controlling an emission timing of the laser beam to be emitted from a laser light source, as well as a laser mirror radiation device equipped with the polygon mirror drive motor described above. A frequency generation magnetized section, a frequency generation pattern, and a frequency dividing circuit are provided. The frequency dividing circuit outputs a signal, detected by the frequency generation pattern when the frequency generation magnetized section rotates, after the frequency dividing operation of the signal for the number of mirror planes of a polygon mirror.
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