LASER CLASS 730i/720i/710 Chapter 2: Technical Reference
2-20
Figure 2-8 Twin beam method
The ECU board sends the laser control (CNT0, CNT1, CNT2) signals to the laser driver in the
Laser/Scanner unit. Meanwhile, the SCNT board sends the VIDEO (nVDATA1, VDATA1,
nVDATA2, VDATA2) signals to the laser driver via the ECU board.
According to these signals, the laser driver performs laser diode emission.
The two laser beams pass through the collimator and cylindrical lenses and strikes the scanning
mirror, which is rotating at a constant speed. The laser beams reflected off the scanning mirror
focus on the photosensitive drum after passing through the focusing lens and reflective mirror.
The scanning mirror rotates at a constant speed so that the laser beams scan across the
photosensitive drum at a constant speed. This forms a latent image on the photosensitive drum
surface.
LD1 scanning line
LD2 scanning line
Paper feed direction
Imaging area
1st scanning
2nd scanning
3rd scanning
4th scanning
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