RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
202
“Spot Distance Control”
The “Spot Distance Control” functionality is only
available for scan systems equipped with
SCANahead servo control (for example, excelliSCAN
series).
With set_auto_laser_control(
Ctrl
= 7 )
(“Spot Distance Control”), temporal output pulses
are controlled to a geometrically constant pulse
distance. This pulse distance is defined by
spot_distance or spot_distance_ctrl. The
parameters
Value
,
MinValue
and
MaxValue
have no
meaning with the “Spot Distance Control”
functionality.
The speed correction occurs with
Mode
= 2 + 16 + (optionally) 32, (see above).
“Spot Distance Control” cannot be combined with
Mode
= 1, 2 or 5.
The correction is more precise and dynamic than the
comparable control with
Ctrl
= 5 (HalfPeriod). For
successful use, a laser with “pulse-on-demand”
functionality should be used that outputs laser pulses
immediately when triggered by the LASER1 signal.
Frequency modulations are set with an accuracy of
1/64 µs for the pulse distance.
A comparison of a typical marking result with
“Automatic Laser Control“ (
Ctrl
= 7) and without
“Automatic Laser Control“ is shown in Figure 57.
As an alternative to set_auto_laser_control with
Ctrl
= 7, the marking shown in Figure 58 could also
be carried out with Sky Writing switched on.
However, when using set_auto_laser_control with
Ctrl
= 7 the process time is often shorter.
Notes
• set_auto_laser_control(
Ctrl
= 7 )
(“Spot Distance Control”) cannot be combined
with:
– “Vector-controlled laser control” by
set_vector_control (
Ctrl
= 5) (
HalfPeriod
)
– Laser Mode 4
(1)
– Laser Mode 6
(1)
• set_trigger/set_trigger4/set_trigger8
(signal 24) records an internal control signal but
not
HalfPeriod
.
(1) In Laser Mode 4 and Laser Mode 6, only a standby
signal is outputted that cannot be varied.
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