THEORY GUIDE Optical
10DEC05
TG4825-1
Page
58 of 120
GALVO
The GALVO moves the laser beam to scan the SCREEN:
• rotates the GALVO MIRROR to cause the laser beam to scan across the SCREEN - fast
scan
• moves to the beginning of the next line on the SCREEN
• scans the next line until the SCREEN is fully scanned
The GALVO uses a feedback system in which the desired position of the GALVO MIRROR is
compared to the actual
position in the rotation, and corrections are made to keep the GALVO
in the correct position on the SCREEN at the correct time. When the GALVO is in the correct
position, the laser beam is also in the correct position.
BOARD
A18
PRE-REGULATOR
LASER DRIVER
GALVO BOARD
DIGITIZER
Desired Position
Clock Signal
Plate Size
Line Start Signal
Offset and Amplitude
Closed Loop
Servo Circuit
Drive Signal
Desired Position Signal
Actual
Position
Signal
A3
BOARD
LASER DRIVER
DIODE BOARD
A17
H194_5041HC
A4
GALVO
MIRROR
GALVO
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