: Feb. 6 2004
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AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 61
C. Operational descriptions
[Laser optical path]
∗ This unit must not be disassembled in the market.
(1) Polygon mirror motor
The number of mirror surfaces and the motor RPM are reduced to
reduce noises and increase reliability.
(2) Outline of LSU specifications
7 BD PWB Detects the timing of laser scan start. This device is used to detect a laser trouble.
8 No. 2 mirror Converges laser beams to focus.
9 Plane lens Assures the optical path for laser beams.
10 Convergence lens for BD Converges laser beams onto the BD PWB.
No. Name Code, signal name Function
RW Control signal +5VLD 5V power for laser diode
RW Control signal /READY Polygon mirror motor READY signal ("L" in the constant speed rotation)
RW Control signal /PMCLK Clock signal for driving the polygon mirror motor
RW Control signal /START Polygon mirror motor drive start signal
RW Control signal /VIDEO VIDEO (Image signal)
RW Control signal /SYNC Sync signal (SYNC) from BD, sync signal for 1 line
No. Name Function
Model
Number of
mirror surfaces
Rotation
speed
Bearing Remark
AR-M550N/U,
AR-M620N/U
14 surfaces 34000rpm AIR Superior in
silence
AR-M700N/U 14 surfaces 40000rpm AIR
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Effective scan width: 297mm
Resolution: 600dpi
Beam diameter: Main scan = 60 - 85 µm
Sub scan = 75 - 110 µm
Laser power:
0.385±0.04mW (AR-M550N/U, AR-M620N/U)
0.480±0.04mW (AR-M700N/U)
LD wave length: 770 - 795nm
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