| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical scanner constituted so that scanning speed is made higher and an image area is extended by preventing the malfunction of a laser beam source by returning light and simultaneously improving the lighting time of the laser beam source restricted by the returning light. SOLUTION: In this optical scanner 10, divergent luminous flux Lbo emitted from the light emitting part 104 of the laser beam source 12 is deflected to scan by a rotary polygon mirror and partially returns to the laser beam source 12, so that the returning light beam is generated. A pedestal 102 supporting the light emitting part 104 is arranged to a direction where the returning light beam is made incident on the laser beam source 12 are the returning light beams Bm1 and Bm2 made incident on a light receiving part 106 to measure the luminous energy of the light emitting part 104 are intercepted, whereby the malfunction of the laser beam source 12 is prevented. |
