Scanlab RTC6 PCIe Board - Set_Defocus

RTC6 boards
Doc. Rev. 1.0.21 en-US
10 RTC6 Commands
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Ctrl Command set_defocus
Function Determines a focus shift for 3D outputs.
Restriction If the Option “3D” has not been enabled or if no 3D correction table has been assigned
(see select_cor_table), then set_defocus has no effect. Nevertheless, the supplied focus
shift value is stored internally and takes effect as soon as a 3D correction table is assigned.
Call set_defocus( Shift )
Parameters Shift Focus shift. In bits.
As a signed 32-bit value.
Allowed value range: [–524,288…+524,287].
Out-of-range values are clipped to the boundary values.
Comments • A focus shift causes a defocusing of the laser focus relative to the working plane.
A positive value increases the focal length of the Dynamic Focusing Unit and shifts the
focus position, for example, for the control value (0|0|0) by about
d = Shift / K to the plane z = –d [mm].
For the calibration factor K, see Chapter 7.3.2 ”Image Field Size and Image Field
Calibration”, page 167; furthermore, 8 in Chapter 7.3.6 ”Output Values to the Scan
System”, page 181.
• If the resulting total Z output value is too large, the z axis moves to the limit stop.
Make sure that this is avoided as far as possible, see get_galvo_controls.
• If set_defocus is called during output of a vector, then it is only executed directly
before the next list command. To avoid “Hard Jumps”, a jump to the changed z output
is performed at jump speed. Length and duration of the jump depend on the changed
z control value. The duration can be calculated by get_galvo_controls.
If no list is currently BUSY list execution status, then the jump executes immediately,
whereby no delay occurs at the next start.
• If the INTERNAL-BUSY list execution status is set, set_defocus is only executed with a
delay (after INTERNAL-BUSY list execution status has been reset again).
• set_defocus sets the INTERNAL-BUSY list execution status while the jump to the
changed z output is executed.
• After “vector-controlled laser control” is activated by set_vector_control( Ctrl = 7 ),
the focus shift changes with parameterized [*]mark[*] Command or Jump Commands,
too.
RTC4RTC6 Basically unchanged functionality. But the RTC6 command avoids “Hard Jumps”.
RTC5RTC6 Unchanged functionality.
Version info Available as of DLL 600, OUT 600, RBF 600.
References set_defocus_list, set_offset_xyz, set_defocus_offset, get_galvo_controls