Chapter 55-15.1 Construction5.1.1 Overview 0017-2643iR2022i / iR2025 / iR2030 / iR2018 / iR2022 / iR2018iThe laser scanner unit consists of a laser driver, scanner motor, and others. It is controlled by the signals from the DC controller PCB.The laser driver operates the laser diode to emit light in response to the laser control signals and video signals from the DC controller PCB.Laser beams are emitted, through a collimator lens and cylindrical lens, to the hexahedral mirror rotating at a constant speed.Laser beam reflected by the hexahedral mirror focus on the photoconductor drum via the imaging lens and loop-back mirrors installed before the hexahedral mirror.When the hexahedral mirror rotates at a constant speed, the photoconductor drum is scanned with laser beams at a constant speed.When the photoconductor drum rotates at a constant speed and the photoconductor is scanned with laser beams at a constant speed, a latent image is formed on thephotoconductor drum.5.1.2 Specifications and Control Mechanism 0017-2646iR2022i / iR2025 / iR2030 / iR2018 / iR2022 / iR2018iT-5-15.1.3 Main Components 0017-2647iR2022i / iR2025 / iR2030 / iR2018 / iR2022 / iR2018iF-5-1T-5-2Laser beamNumber of laser beams 2 beamsScanner MotorType of motor DC brushless motorRotation control Constant speed rotaion controlPolygon MirrorNumber of facets 6 facets (40-mm dia.)Control MechanismSynchronous control Horizontal (main scan) synchronizationcontrolLight intensity control Automatic photocurrent control (APC)Others Laser emission ON/OFF controlLaser scanner motor controlLaser shutter controlName Function[1] Photoconductive drum Receives laser beams to form a latent image.[1][2] [3][4][5][6][7]
