RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
178
ct5 Correction File Header
The ct5-correction file header contains 16
parameters, see following table.
These can be read out and thus directly incorporated
into a user program:
• from the currently loaded correction tables by
get_table_para
• from assigned correction tables by
get_head_para
Notes
• With ctb-correction files, some parameter values
can exclusively be taken from its associated
*_ReadMe.txt
file. These must be transferred
manually to the user program.
• A
ct5
file created by converting another
ctb
file,
see Section ”Converting Correction Files”,
page 180, does not contain all parameter data.
• A 1to1 correction file does not contain all
parameter data.
• Parameters 3…7 are only relevant for
3D marking. In 2D correction tables, they are 0.
• For the same 3-axis scan system, the ABC
coefficients (parameter 5…7) in ctb-
correction files and ct5-correction files are
identical.
Parameter
(a)
Description
0 Type of the correction table.
• = 0.0: 2D correction table
• = 1.0: 3D correction table
1 Calibration factor K
xy
[bit/mm].
See Chapter 7.3.2 ”Image Field Size and Image Field Calibration”, page 167.
2 Focal length or working distance [mm].
• For a configuration with a scan objective: the effective focal length of the objective [mm].
• For a configuration without a scan objective: the working distance A [mm].
A = distance from the optical axis of the incident laser beam at the first deflection mirror
to the image plane.
3 Stretch factor for the x direction.
Compensates the pyramid-shaped Image Field change which exists in the z direction of
3D markings.
4 Stretch factor for the y direction.
See parameter 3.
5 Coefficient A of the polynomial for z axis control, see page 170:
offset part, ±26 Bit.
6 Coefficient B of the polynomial for z axis control, see page 170:
linear part, ±11 Bit.
7 Coefficient C of the polynomial for z axis control, see page 170:
square part, ±4 Bit.
8 Number of the correction file.
With correction files supplied by SCANLAB, the parameter corresponds to the number in the
file name (for example, 145 for
D2_145.ct5
or
D3_145.ct5
).
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