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LASER EXPOSURE
2.6 LASER EXPOSURE
2.6.1 OVERVIEW
[F]
[D]
A: Laser Diode Unit (LDU)
B: F-theta Lenses
C: Barrel Toroidal Lens (BTL)
D: Drum Mirror
E: Laser Synchronization Detector Board-1
(LSDB-1)
This machine uses a laser diode to produce electrostatic images on an OPC drum
[I]. The laser diode unit converts image data from the LD main control board into
laser pulses, and the optical components direct these pulses to the drum.
To produce a high quality copy image, there are 256 gradations for each pixel for
each color. These gradations are produced by power modulation and pulse width
modulation on the laser signal.
The laser beam writes the latent image on the drum. The laser beam makes the
main scan while the drum rotation controls the sub-scan.
The strength of the beam is about 0.76 mW on the drum surface at a wavelength of
780 nm. (The rated output of the laser diode is 15 mW).
[B]
[C]
[I]
[E]
[J]
A259D102.WMF
F: Laser Synchronization Detector Board-2
(LSDB-2)
G: Polygon Mirror
H: Cylindrical Lens
I: OPC Drum
J: Toner Shield Glass
2-56
24 February, 1999
[G]
[H]
[A]
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