December 2002 TOSHIBA TEC 8 - 3 e-STUDIO160/200/250 PRINTING
(2) Polygonal-Mirror Motor Unit
The polygonal-mirror motor unit comprises a po-
lygonal mirror and a polygonal-mirror motor.
Polygonal-mirror motor
The polygonal-mirror motor rotates the po-
lygonal mirror at high speed.
The DC motor controls the rotation speed
of the mirror as follows:
e-STUDIO160 series
600 dpi : 20,527.56 rpm
400 dpi : 13,382.60 rpm
e-STUDIO200/250 series
600 dpi : 27,874.016 rpm
400 dpi : 18,582.677 rpm
Polygonal mirror
The laser beams emitted from the laser di-
ode are reflected by this mirror. As the po-
lygonal mirror is rotated by the polygonal-
mirror motor, the direction of the reflected
laser light moves in sync with the rotation.
The direction of movement is the primary
scanning direction of the image with each
single scan ending in one plane of the po-
lygonal mirror.
As the polygonal mirror has six planes, six
scans are completed in one rotation of the
polygonal mirror.
Fig. 8-2-2
One scan is completed by completion of steps A to C .
One scan is carried out on one plane of the polygonal
mirror. Six scans can be carried out with one rotation of
the polygonal mirror.
Laser light
Drum
Drum
Drum
Laser light
Laser light
B
C
A
09-02-05
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