| 摘要 |
PROBLEM TO BE SOLVED: To provide a light beam scanner in which a synchronization detection sensor normally operates and the incident of returning light to a laser diode (LD) is prevented, and to provide an image forming apparatus. SOLUTION: The light beam scanner includes an LD unit 31; a rotating polygon mirror 34 which deflects a light beam emitted from the LD unit 31; scanning optical systems 35A, 35B which condense the light beam deflected by the rotating polygon mirror 34 onto an image carrier 4, to form an electrostatic latent image; and the synchronization detection sensor 37, which receives a portion of the light beam deflected by the rotating polygon mirror 34 and detects the writing start position in the main scanning direction on the image carrier 4; and accordingly, the synchronization detection sensor 37 has a mounting angle, with respect to the angle of the light beam which is incident on the synchronization detection sensor, respectively in the main scanning direction and in the subscanning direction. COPYRIGHT: (C)2010,JPO&INPIT
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