Brother International HL-2600CN Service Manual - Page 72
Scanning System, Structure of the Scanning System Refer to Fig.4-24.
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1.2 Scanning System This printer employs a semiconductor laser diode as a light source. This laser diode is switched according to the transmitted image data (video signal). The generated laser light scans over the OPC belt through a polygon mirror and lens, by which method electrostatic latent images will be formed on the OPC belt. (1) Structure of the Scanning System (Refer to Fig.4-24.) The scanner unit is located as shown in Fig.4-8. The scanner unit consists of the following parts; Laser Unit: Light emitting source incorporating a laser diode. Cylinder Lens: Condenser for the laser beam. Polygon Mirror: Hexahedral mirror for scanning the laser beam. F- Lens: Focus lens for the laser beam. Scanner Motor: Motor to rotate the polygon mirror. Mirror: Reflecting mirror for the laser beam path. LDC: Laser diode control circuit. PD: Beam detector. BTD Mirror: Beam timing detector mirror to guide the laser beam to the PD sensor. 9 2 6 4 8 7 5 1 2' 3 Fig.4-24 IV-21
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