7
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LASER OPTICAL UNIT
7 - 1
7. LASER OPTICAL UNIT
7.1 General Description
The laser optical unit radiates the laser beam onto the photoconductive drum responding to the digital
image signals transmitted from the MAIN board. to create the latent image. Image signal is converted
into the light emission signal of the laser diode on the laser driving PC board (LDR), then radiated on
the drum through the optical elements such as cylinder lenses, polygonal mirror and fθ lens.
The unit must not be disassembled in the field as they are very sensitive to dust and finely adjusted at
the factory.
Fig. 7-1
Fig. 7-2
LDR board
SNS board
H-sync returning mirror
fθ lens-2
Slit glass
fθ lens-1
Polygonal motor
Cylinder lens
Aperture
(
Slit
)
Fine focus lens
Laser diode
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