Confidential
3-21
3.2.2 Laser ASSY PU
This machine employs a semiconductor laser diode as a light source. This laser diode is controlled
by the fast switching according to transmitted image data (video signal).
The generated laser light scans over the OPC belt through a polygon mirror and lens, by which
electrostatic latent images will be formed on the OPC belt.
(1) Structure of laser unit (Refer to Fig.3-24.)
Laser ASSY PU is located as shown in Fig.3-24.
Laser ASSY PU consists of following parts;
1 Laser ASSY: Light emitting source incorporating a laser diode.
2 Cylinder Lens: Condenser of laser beam.
3 Polygon Mirror: Hexahedral mirror scanning the laser beam.
4 F-
θ Lens: Focus lens for laser beam.
5 Scanner Motor: Motor to rotate the polygon mirror.
6 Mirror: Reflecting mirror for the laser beam path.
7 LDC: Laser diode control circuit.
8 PD: Photo detector.
9 BTD Mirror: Beam timing detector mirror to guide the laser beam to PD.
8
3
2
1
5
4
6
7
9
Fig. 3-24
(2) Specification:
Specification of laser unit is described as follows:
Item Specifications
Rated Output of Laser Diode 5mW.
Wave Length of Laser Beam Approx.785nm.
Scanning Density 600dpi
Scanning Width 314mm
Rotations Per Minutes of Scanner Motor 35,904rpm
Number of Polygon Mirror Faces 8
To Next Page
Loading...
