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• nBD signal (Beam Detect)
This is the horizontal scanning (horizontal direction) sync signal for the
LASER beam, and is used for ensuring that the image printing position in
the horizontal scanning direction is constant.
• nVDO signal (Video)
As its name implies, this is the image signal. The video control section
sends the nVDO signal synchronized with the nBD signal after a fixed
period of time after it has detected that the state of the nTOP signal has
changed to "Low." nVDO signals are sent successively from the 1st line of
the image. The LASER is turned ON when nVDO is "Low" and OFF
when "High."
• LASER drive signals
The LASER drive signal is an nVDO signal to which the LASER ON sig-
nal has been added. LASER ON signals are required for generating the
nBD signal.
nVDO
LASER drive signals
About the nBD and nTOP Signals
As described above, the nVDO signals are sent synchronized with the nBD
signals and nTOP signals. What is the purpose of this? There are two rea-
sons:
• To draw images correctly on the photosensitive drum
• To transfer the image correctly onto the recording paper
LASER ON signal
Fig. 4-30 LASER Drive Signals
RECORDING SECTION
4–29
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