| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical write-in device with which the optical write-in of an excellent image is performed by adjusting a position of an optical element whose optical characteristic varies under environmental conditions. SOLUTION: In the multibeam optical write-in device 1, a control part 10 calculates a correction amount of the image position in the directions of main scanning and subscanning, on the basis of an environmental temperature detected by temperature sensors 12 and 13 fitted on scanning lenses 5 and 6, the driving part 21b of a correction part 21 for a beam diameter in the main scanning direction and the driving part 22b of a correction part 22 for a beam diameter in the subscanning direction are driven, a cylinder lens 21a and a cylindrical lens 22a are moved toward the optical axis of a laser beam by an amount corresponding to the correction amount of the image position, thus the beam diameter in the main direction and the beam diameter in the subdirection are corrected. Further, the control part 10 calculates a correction amount of a beam pitch on the basis of the environmental temperature, an actuator 24 of a beam pitch correction part 20 is driven, an LD unit 23 is moved toward the optical axis of the laser beam by an amount corresponding to the correction amount of the calculated beam pitch, thus the beam pitch is corrected.
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