e-STUDIO350/450 LASER OPTICAL UNIT 8 - 4 November 2003 © TOSHIBA TEC
8
(2) Polygonal motor unit
This unit consists of the polygonal motor, polygonal mirror and polygonal mirror cover.
One scan is completed by completion of steps (A) to
(C). One scan is performed on one plane of the polygo-
nal-mirror. Eight scans can be made with one rotation of
the polygonal mirror.
Fig. 8-202
(
A
)
Drum
Laser beam
(
B
)
Drum
Laser beam
(
C
)
Drum
Laser beam
a. Polygonal motor
This motor rotates the polygonal mirror in
high speed.
The DC motor controls the rotation speed
of the mirror motor as follows:
During ready: 10,000.00 rpm
During printing: 38,090.55 rpm (600dpi)
: 38,951.37 rpm (FAX 15.4 × 16.0 dot/mm)
: 37,490.70 rpm (FAX 16.0 × 15.4 dot/mm)
b. Polygonal mirror
One laser beam emitted from the laser di-
ode is reflected by this mirror. As the po-
lygonal mirror is rotated by the polygonal
motor, the reflected laser beam moves in
sync with the rotation. The direction of the
movement is the primary scanning direc-
tion of the image. One scan is performed
on one plane of the polygonal mirror.
As the polygonal mirror has eight planes,
eight scans are performed in one rotation
of the polygonal mirror.
c. Polygonal mirror cover
Polygonal mirror cover reduces the wind-
age loss and noise, prevents adhesion of
foreign objects onto the mirror surface and
releases heat.
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