Scanlab RTC6 PCIe Board - Freely Definable Wobbel Shapes

RTC6 boards
Doc. Rev. 1.0.21 en-US
8 Advanced Functions for Scan Head Control and Laser Control
235
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Wobbel Parameters
• The maximum frequency estimated with
rule of thumb 1:
F = 1/(10
 0.3310
-3
s)  300 Hz.
• Wobbel amplitude estimated with
rule of thumb 2:
A = 0.33
10
-3
s  1.4410
8
bit/s
 47,500 bit.
– In the Image Field this corresponds to a wobbel
amplitude of A/K
 9,5 mm.
• Path velocity of circular wobbel shapes
as given by rule of thumb 3 is:
V
Path
895 bit/10 µs.
• The maximum mark speed results from
V
Path
/K (in this example 89,500,000 bit/s /
5,000,000 bit/m
 17.9 m/s. Note that this value
is a rough estimate. Furthermore, it is dependent
on a position due to the correction file (which is
non-linear).
The calculated path velocity for wobbel only (!)
– should be lower than the specified maximum
positioning speed,
– but there may be certain circumstances where
it is much higher than the typical mark speed.
Make sure that your values are suitable for
operation (temperature status and so on, same as
above).
“Freely Definable Wobbel Shapes”
When defining “freely definable wobbel shapes” (see
set_wobbel_vector) take the dynamics of the
scan head into account.
• The maximum repetition rate for “Freely
Definable Wobbel Shapes” corresponds to the
maximum wobbel frequency estimated by the
rule of thumb 1, page 234.
• The sum of the path (Trajectory) velocity and the
velocity on the freely defined wobbel figure
should not exceed the maximum positioning
velocity.
• The acceleration should not significantly exceed
the value of 2.5 V/S (where V = typical
positioning speed and S = Tracking Error).
• Also with “freely definable wobbel shapes”,
observe the heating of the scan system for freely
definable wobbel figures, see safety notice on
page 234 and rule of thumb 3.