Scanlab RTC6 PCIe Board - Delay Settings - Coordinating Scan Head Control and Laser Control; Laser Delays

RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
145
innovators for industry
7.2 Delay Settings – Coordinating
Scan Head Control and Laser
Control
Scan head control and laser control should suit the
dynamic behavior of the system components, that is,
the
• response behavior of the laser
• response behavior of the galvanometer scanners
(Tracking Error)
• the type of interaction between laser radiation
and material
The following delays are available for this purpose:
• Laser Delays
– LaserOn Delay
– LaserOff Delay
• Scanner delays
– Jump Delay (optionally: variable)
– Mark Delay
– Polygon Delay (optionally: variable)
7.2.1 Laser Delays
There are two different Laser Delays:
• LaserOn Delay
• LaserOff Delay
Laser Delays determine when the Signals for
“Laser Active” Operation are switched on and off.
As a rule, Laser Delays have no influence on the total
marking time. Exceptions:
• A negative LaserOnDelay value, see Section
”LaserOn Delay”, page 146
• Artificially inserted delays, see Section
”Automatic Delay Adjustments”, page 155
The LaserOn Delay and the LaserOff Delay are set by
the undelayed short list command set_laser_delays.
Their unit is 1/64 µs each.
In order to avoid burn-in effects at start and end
points of a marking, the laser focus should be moved
at a speed which is as constant as possible. Therefore,
the laser delay durations must be adjusted to the
Tracking Error of the scan head and the set
mark speed
(1)
, see also Chapter 7.2.3 ”Notes on
Optimizing the Delays”, page 155.
(1) In addition, automatic readjustment of the laser power
during marking can be applied for optimization, see
Chapter 7.4.9 ”“Automatic Laser Control“”, page 197.