M-19
9-2. Laser Exposure Process
• The laser beam light emitted from the Print Head is used to create an electrostatic latent
image on the surface of the PC Drum.
• The following control is provided to correctly time image printing.
• When the printer receives a PRINT signal, the Polygon Motor and the Main Motor start
rotating and the paper is taken up and fed into the printer.
• The printing is started when the Controller/Mechanical Control Board sends a VIDEO
signal to the Print Head a given period of time after the leading edge of the paper actu-
ates the Paper Take-Up Switch (TOD signal).
• The print start position of a new line as shifted from the previous one is established by
transmitting a VIDEO signal after the lapse of an appropriate period of time with refer-
ence to the SOS Sensor signal.
• The SOS Sensor provided in the PH ensures that the laser beam is emitted at the same
timing for all lines in the main scanning direction.
4136M006AB
SOS Sensor
Laser Diode
Print Head Unit
Polygon Motor
PC Drum
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