Write Unit; Composition; Mechanisms - Minolta Di551 Service Manual

WRITE UNIT

[1] Composition

1. Collimator lens unit
2. Laser driver board (LDB)
3. Index sensor board (INDXSB)
4. Cylindrical lens 2
5. Write mirror

[2] Mechanisms

Mechanism
Scan*1 Polygon mirror
Light source*2 1-chip, 2-beam laser diode
(Power: 15 mW per beam)
Reference posi- Index sensor
tioning*3
*1 Path of laser light
The light output from the semiconductor laser is
radiated onto the OPC drum via the collimator
lens, cylindrical lens 1, polygon mirror, fθ lens,
cylindrical lens 2, and write mirror.
3
2
1
9
8
7
6.
7.
8.
9.
Method
2-D-1
4
5
6
Index mirror
fθ lens
Polygon mirror
Cylindrical lens 1
1
7
6
5
4
1. Semiconductor laser
2. Write mirror
3. Cylindrical lens 2
4. fθ lens
5. Polygon mirror
6. Cylindrical lens 1
7. Collimator lens
WRITE UNIT
2
3