Figure 4-9 Laser-control-circuit block diagram
Laser-emission control simply turns the laser diodes on and off. Automatic power control limits the
amount of light that the laser diodes emit. Horizontal-synchronization control determines the starting
position for the horizontal direction of the image. Image-mask control prevents laser beams from
striking the non-imaging areas of the drum, which is approximately 5 mm (0.2 inch) along the vertical
edges and 8 mm (0.3 inch) at the top and bottom.
130 Chapter 4 Theory of operation ENWW
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