EPSON AcuLaser C2600/2600
Revision B
Operating Principle
Print Process
90
LASER SCANNING UNIT
LSU is the exposure unit that outputs the laser beam to make an electrostatic latent
image on the drum surface.
The main components of the LSU are described below.
Laser Diode/Monitor Circuit
An image data is input to LSU as electric signals.
The laser diode converts image data (electric signals) to optical signals that switch
the laser on and off.
The output state of the laser diode (the amount of light emitted from the diode) is
monitored by the monitor circuit at any time and the circuit controls the light
intensity to keep it constant because a variation of the intensity causes an
inadequate electrostatic latent image. This is called “APC (Auto Power Control)”.
Scanner Motor
Scanner motor consists of a motor that operates at a fixed speed and a polygon
mirror attached to the motor’s rotary shaft. The polygon mirror is octagon-shaped
and its eight lateral sides are covered with reflecting mirrors. The laser beam
emitted from the laser diode is irradiated on the polygon mirror which is rotating
by the polygon motor. As the mirror is rotating, the reflecting angle of the laser
beam changes each time it is bounced off the mirror. This allows the laser to scan
across on the drum from side to side. The laser can scan one horizontal line on the
drum while it hits on one reflecting mirror.
Lens, Fixed Mirror and Window
The laser beam reflected by the polygon mirror passes through the lens, mirror and
window on the way to the drum surface. The lens functions to compensate for
aberration, the mirror ensures an optical path, and the window prevents foreign
bodies from entering into the LSU.
Hsync Sensor
The timing to start scanning on the drum by the laser must be accurate to create an
electrostatic latent image precisely corresponding to the image data. The Hsync
sensor is used to correct the timing. When the Hsync sensor receives a laser beam,
it generates an electric signal for detecting the initial position for each scanning
line (reference position to start scanning). Then the signal is sent to the printer
controller via the engine controller and the printer controller returns a command to
start scanning. Scanning by the laser beam starts upon receiving the command sent
to the exposure control circuit in the LSU via the same route.
Figure 2-6. LSU
Laser Diode
Lens
Lens
Lens
Fixed Mirror
Window
Fixed Mirror
Scanner Motor
Monitor
Circuit
Drum
Hsync
Sensor
Fixed Mirror
Lens
02000701
Содержание Aculaser 2600 Series
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Страница 141: ...C H A P T E R 3 TROUBLESHOOTING ...
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