19 January, 2001 LASER EXPOSURE
6-39
Detailed
Descriptions
6.6.4 LASER BEAM PITCH CHANGE MECHANISM
When the LD positioning motor [A] turns, the metal block [B] in contact with the LD
unit housing [C] moves up and down and changes the position of L2 (L1 does not
move).
Both LD unit positions are at fixed distances from the LD unit home position sensor
[D].
Usually, the LD unit moves directly to the proper position. However, when the
number of times that the resolution has changed reaches the value of SP2-109-5
(Auto Pitch Adjustment Interval), the LD unit moves to the home position, and this
re-calibrates the LD unit positioning mechanism.
B004D543.WMF
[A]
[B]
[C]
[D]
To Next Page
Loading...
