Laser unit, A. basic structure, B. laser beam path – Sharp AL-1651CS Benutzerhandbuch

Seite 33: C. composition, Fuser section, Fuser section -3

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AL-1651CS OPERATIONAL DESCRIPTIONS 7 - 3

3. Laser unit

The image data sent from the MCU (image process circuit) is sent to
the LSU (laser unit), where it is converted into laser beams.

A. Basic structure

The LSU unit is the writing section of the digital optical system.

The semiconductor laser is used as the light source, and images are
formed on the OPC drum by the polygon mirror and f

θ

lens, etc.

The laser beams are passed through the collimator lens, the cylindrical
lens, the polygon mirror, the f

θ

lens, and the mirror to form images on

the OPC drum in the main scanning direction. The laser emitting PWB
is provided with the APC (auto power control) in order to eliminate fluc-
tuations in the laser power. The BD PWB works for measurement of
the laser writing start point.

Makes the laser scanning speeds at both ends of the drum same as
each other.

B. Laser beam path

C. Composition

Effective scanning width: 216mm (max.)

Resolution: 600dpi

Beam diameter: 75um in the main scanning direction, 80um in the sub
scanning direction

Image surface power: 0.17 ±0.01mW (Laser wavelength 770 - 795nm)

Polygon motor section: Brushless motor 31,180rpm
No. of mirror surfaces: 4 surfaces

4. Fuser section

No

Component

Function

1

Semiconductor laser

Generates laser beams.

2

Collimator lens

Converges laser beams in parallel.

3

CY lens

Converges laser beams onto the
polygon mirror surface.

4

Polygon mirror,
polygon motor

Reflects laser beams at a constant
rpm.
(A four-surfaces polygon mirror is
used.)

5

BD (Mirror, lens,
PWB)

Detects start timing of laser scanning.

6

f

θ

lens

Converges laser beams at a spot on
the drum.

Makes the laser scanning speeds at
both ends of the drum same as each
other. (Refer to the figure below.)

2

5

3

6

4

1

a

b

c

a

b

c

d = e = f

d

e

f

f

θ

LENS

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