CLEARjet GmbH
CX-one
7.7 Optical Parameter
The reflective characteristic of the card surface in the area of the markings must attain
the boundary values that are cited in the following table. These boundary values relate
to the red-light with 660 nm and infrared light with a wave length of 820 nm respectively.
Description Min.
Max.
Dimension
Reflection 'white'
85
%
Reflection 'black'
15
%
7.7.1 Measurement Conditions
Reference colour: magnesium oxide (MgO) or barium sulphate (BaSO
4
)
The reflection value of magnesium oxide or barium sulphate is equivalent to 100%.
If the reflected spectrum = 0, it is equivalent to 0%.
Light source: IR-LED, wave length: 820 nm
Red-light, wave length: 660 nm
Illumination angle 45° to the measurement surface
Measurement area: circle with radius 0.2 mm
7.7.2 Application Note
The optical characteristic of the card surface and the markings depends on many
factors that are often not appreciable with the naked eye in the apparent wave length
area. Amongst other things, the reflection characteristic depends on the texture of the
card surface (roughness), penetrability of the used cover foil, characteristic and
condition of the used print ink, infrared penetrability of the card material and so on.
To avoid problems in this regards with your projects we urgently recommend a test run
before using the direction detector.
7.8 Controlling the Direction Detector
It is possible to control the module directly via either the 'RS 232' or 'USB' printer
interfaces. See the CX-one Programmers Manual for more detailed descriptions of
control commands or ask for Active CX SDK.
The Active CX SDK (software development kit) includes an ActiveX package for
controlling the direction detector as well as a programmer’s manual with detailed
information about programming the direction detector.
User Manual
page 38 / 40
