Invention Grant
US09041759B2 Laser scanning unit and image forming apparatus including the same, with laser light intensity detection, adjustment, and control 有权
激光扫描单元和包括该激光扫描单元的图像形成设备,具有激光强度检测,调节和控制

Laser scanning unit and image forming apparatus including the same, with laser light intensity detection, adjustment, and control
Abstract:
A laser scanning unit includes a laser light source, rotating polygon mirror, drive motor, and entry detection, intensity detection, intensity adjustment, and drive control portions. The laser light source radiates first and second laser lights in first second directions, respectively. The drive motor rotates the polygon mirror reflecting the first laser light. The intensity adjustment portion adjusts the first laser light in accordance with the second laser light detected by the intensity detection portion, until a second time after a first time has elapsed since the first laser light entry detection by the entry detection portion. The drive control portion, upon adjustment by the intensity adjustment portion, drives the drive motor at a first rotation speed, wherein a return light entry timing is included within the first time or from when the second time has elapsed to the timing of the entry detection portion detection.
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