Laser Exposure
SM 6-11 G179
Detailed
Descriptions
6.4 LASER EXPOSURE
6.4.1 OVERVIEW
1. LD unit
2. Cylindrical lens
3. Polygonal mirror
4. Shield glass
5. Mirror
6 Synchronization detector
7 BTL (Barrel Toroidal Lens)
8 F-theta mirror
9 Toner shield glass
This machine uses two laser diodes to produce electrostatic images on an OPC drum. The
laser diode unit converts image data from the BCU board into laser pulses, and the optical
components direct these pulses to the drum. To produce a high quality print image, these
are 256 gradations for the laser power.
The output path from the laser diode to the drum is shown above. The LD unit outputs two
laser beams to the polygon mirror through the cylindrical lens and the shield glass.
Each surface of the polygon mirror reflects two full main scan lines. The laser beams go to
the F-theta mirror, mirror, and BTL (barrel toroidal lens). Then these laser beams go to the
drum through the toner shield glass. The laser synchronization detector determines the
main scan starting position.
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