Printing Process - Canon FACSIMILE BASIC 2000 Service Manual

RECORDING SECTION
(4) Condensing lens
This lens focuses the LASER beam on the photosensitive drum. Note,
however, that the scanning speed at points A and B is different by simply
focusing the LASER beam as can be seen in Fig. 4-39. Accordingly, a lens
that has the characteristic of ensuring that the scanning speed is uniform at
any point on the photosensitive drum is used as the condensing lens.
4.6

Printing Process

The printing process comprises the six steps shown below.
4–34
Scanning mirror
LASER beam
Focusing lens
Scanning mirror
LASER beam
f lens
Fig. 4-39 Condensing Lens
1: Primary charging step
6: Drum cleaning step
5: Fixing step
Fig. 4-40 Printing Process
Point B
Fast scanning speed
Slow scanning speed
Point A
Point B
Fixed scanning speed
Point A
2: Exposure step
3: Developing step
4: Transfer step
: Photosensitive drum rotating direction
: Flow of recording paper