e-STUDIO200L/202L/203L/230/232/233/280/282/283 © 2004 - 2008 TOSHIBA TEC CORPORATION All rights reservedLASER OPTICAL UNIT8 - 42) Polygonal motor unitThis unit consists of the polygonal motor, polygonal mirror and polygonal mirror cover.a. Polygonal motorThis motor rotates the polygonal mirror at highspeed.The DC motor controls the rotation speed ofthis motor as follows:During printing: 23,562.992 rpm (600 dpi): 24,095.503 rpm (FAX 15.4 × 16.0 dot/mm): 23,191.921 rpm (FAX 16.0 × 15.4 dot/mm)Fig. 8-4b. PolygonalOne laser beam emitted from the laser diodeis reflected by this mirror. Since the polygonalmirror is rotated by the polygonal motor, thereflected laser beam moves in sync with therotation. The direction of the movement is theprimary scanning direction of the image. Onescan is performed on one plane of the polygo-nal mirror.Since the polygonal mirror has eight planes,eight scans are performed in one rotation ofthe polygonal mirror.c. Polygonal mirror coverThe polygonal mirror cover reduces the wind-age loss and noise, prevents adhesion of for-eign matter onto the mirror surface andreleases heat.One scan is completed by completion of steps (A)to (C). One scan is performed on one plane of thepolygonal-mirror. Eight scans can be made withone rotation of the polygonal mirror.(A) DrumLaser beam(B)DrumLaser beam(C)DrumLaser beam04/07
