| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanner in which accuracy of detecting light quantity of a surface emitting laser is improved and the accuracy of detecting light quantity at a light receiving element is not deteriorated even when alignment is adjusted. SOLUTION: The ratio of the light quantity directed to the light receiving element 20 and the light quantity of a beam used for exposure is kept fixed even when variations are present among the divergent angles of respective beams and the difference in light quantity among beams is not caused, since a half-mirror 18 serving as a beam splitting means is arranged behind an aperture 16 which shapes the beam. Further, the accuracy of detecting light quantity is not deteriorated even when alignment adjustment (XYθ: coordinates and angle) is carried out, since the positional relation of the surface emitting laser 12 and the light receiving element 20 is not changed. Further, the surface emitting laser 12 and the light receiving element 20 are provided on one and the same circuit board 30, thus there is no possibility that noise is picked up from outside by a harness since the harness is not interposed in-between, when a detected signal at the light receiving element 20 is fed back to the circuit board 30. COPYRIGHT: (C)2006,JPO&NCIPI
|
