Outline Of Lsu Specifications; Polygon Mirror Motor - Sharp AR-M550N Service Manual

: Feb. 6 2004
1
No. Name
7 BD PWB
8 No. 2 mirror
9 Plane lens
10 Convergence lens for BD
No. Name Code, signal name
RW Control signal +5VLD
RW Control signal /READY
RW Control signal /PMCLK
RW Control signal /START
RW Control signal /VIDEO
RW Control signal /SYNC
C. Operational descriptions
[Laser optical path]
∗ This unit must not be disassembled in the market.

(1) Polygon mirror motor

Number of
Model
mirror surfaces
AR-M550N/U, 14 surfaces
1
AR-M620N/U
AR-M700N/U 14 surfaces
1
The number of mirror surfaces and the motor RPM are reduced to
reduce noises and increase reliability.
Detects the timing of laser scan start. This device is used to detect a laser trouble.
Converges laser beams to focus.
Assures the optical path for laser beams.
Converges laser beams onto the BD PWB.
5V power for laser diode
Polygon mirror motor READY signal ("L" in the constant speed rotation)
Clock signal for driving the polygon mirror motor
Polygon mirror motor drive start signal
VIDEO (Image signal)
Sync signal (SYNC) from BD, sync signal for 1 line
Rotation
Bearing Remark
speed
34000rpm AIR Superior in
silence
40000rpm AIR
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 61
Function
Function

(2) Outline of LSU specifications

Effective scan width: 297mm
Resolution: 600dpi
Main scan = 60 - 85 µm
Beam diameter:
Sub scan = 75 - 110 µm
Laser power: 0.385±0.04mW (AR-M550N/U, AR-M620N/U)
1
0.480±0.04mW (AR-M700N/U)
LD wave length: 770 - 795nm