Mita PointSource Ai 3010, Service Manual

Page: 38 / 478

2AR
1-3-18
The dimensions of the laser beam are as shown in Figure 1-3-14.
65
µ
m
70
µ
m
Figure 1-3-14
Scanning in the main direction is provided by the rotating polygon mirror, while
scanning in the auxiliary direction is provided by the rotating drum, forming a static
latent image on the drum.
The static latent image of the letter “A”, for example, is formed on the drum surface as
shown in Figure 1-3-15. Electrical charge is dissipated on the area of the drum surface
irradiated by the laser.
The focal point of the laser beam is moved line by line, and adjacent lines slightly
overlap each other.
Main
scanning
direction
Auxilary
scanning
direction
: laser beam is on
Figure 1-3-15