Operation; Laser Beam Path; Write Control; Image Stabilization Control - Konica Minolta bizhub 500 Service Manual

Theory of Operation Ver1.0 Feb.2006
7.2

Operation

7.2.1

Laser beam path

[1] Dust-proof glass
[2] CY2 lens
[3] Drum
[4] Index board (INDEXB)
θ
[5] f lens
7.2.2

Write control

Image data that has been processed is converted into laser beam on the laser drive board (LDB) to be irradiated
on the drum. 1 laser diode emits 2 beams and 2 lines are written per 1 scan.
To prevent the mis-centering of a written image, an INDEX signal detected by the index board (INDEXB) is used
to decide the reference position for writing in the drum shaft direction (main scan direction) to control the starting
position of the laser irradiation onto the drum.
7.2.3

Image stabilization control

The following items are provided for the image stabilization control. For details, See
CONTROL".
• MPC (Maximum power control)
• APC (Auto power control)
• Dot diameter adjustment control
[10]
[9]
[8]
[7]
[6]
[5]
[4]
[1]
[2]
[3]
[6] Polygon mirror
[7] CY1 lens
[8] Collimator lens
[9] Laser diode
[10] Index mirror
"21. IMAGE STABILIZATION
7. WRITE SECTION
50gat2c041na
19