Write Unit; Composition; Mechanisms - Minolta Di850 Service Manual

WRITE UNIT

[1] Composition

Index sensor board
2nd mirror
fθ lens 2
Collimator lens unit 1

[2] Mechanisms

Mechanism
*1 Scan Polygon mirror
Rotational speed:
24,803.1 rpm (400 dpi)
37,204.7 rpm (600 dpi)
Light source Laser diodes (two)
(Output: Max. 20 mW)
*2 Positioning Index sensor
Fine adjustment prism
*3 Laser beam Beam combining prism
combining
*1 Path of laser light
The light output from semiconductor laser is radi-
ated onto the OPC drum via the collimator lens,
compression prism, fine adjustment prism, beam
combining prism, cylindrical lens 1, polygon mir-
ror, fθ lens 1, fθ lens 2, second mirror, cylindrical
lens 2, and third mirror.
Cylindrical lens 1
fθ lens 1
Laser driver board LD1
Method
2-D-1
Polygon mirror
Cylindrical lens 2
3rd mirror
Laser driver board LD2
Collimator lens unit 2
Beam combining prism
Semiconductor
laser LD2
CY2 lens
3rd mirror
Polygon
mirror
Glass cover
Index mirror
Index sensor
OPC drum
WRITE UNIT
Compression prism
Semicon-
ductor
laser LD1
Collimator
lens unit
Beam
combining
prism
CY1 lens
2nd mirror
fθ lens 2
fθ lens 1
Polygon Cooling Fan