Der Blätterkatalog benötigt Javascript.
Bitte aktivieren Sie Javascript in Ihren Browser-Einstellungen.
The Blätterkatalog requires Javascript.
Please activate Javascript in your browser settings.
40 Elektronik International 2020 Optoelectronics sensor serves as a unidimensional user interface In contrast to conventional proximity sensors which evaluate the signal strength as an indicator for the position of an object here the combination of transmitter and receiver signal determines the position of an object Touchscreen without touch While replacement of conventional touchscreens is obvious zForce technology finds further areas of application It is ideal for the monitors of imaging processes in medical technology Image quality such as contrast coating antireflection coating and parallax are retained because the optical properties of the display surface are not affected This is not the only advantage of not having to touch the surface with sterile gloves but also in public places where elevators are called vending machines operated and toilets flushed germs have no chance to spread! Even in the food industry or a restaurant kitchen devices can be operated with dirty fingers without touching the surface and making the screen underneath unreadable Used as a light barrier the technology can detect the presence of unwanted objects and the system can take appropriate action As a proximity sensor it can also be installed in moving objects to avoid collision with the surroundings such as in suction or mowing robots Software integration The builtin controller presents itself as a USB HID human interface device so it works straight away with the operating system of a corresponding host and replaces or complements the mouse functions as single or multitouch Alternatively it provides information via I²C Comparison with other touch technologies Compared to other technologies zForce performs well In particular the lack of coupling to the underlying display enables applications that cannot be implemented with other touchscreens Figure 6 shows the sensor in side view Sturdiness The touch sensor itself is resistant to the usual chemicals used for cleaning or sterilisation in medical environments Vandalism usually directed against the display is made ineffective there with a suitable windscreen Since the functional principle is not based on electromagnetic fields but on invisible light the sensor neither emits electromagnetic radiation nor is its function impaired by fields or interference pulses Filters prevent the sensor from seeing ambient light from the sun or strong light sources Service life is long regardless of the number of operations Ergonomics While the argument for PCAP is the flat flushfitting surface the zForce sensor scores with its suitability for special applications It offers multitouch functions with the recognition of several fingers and gestures and can be operated with all media be it thick gloves credit cards or fingernails This feature can also be exploited to enable noncontact operation in sterile areas or with dirty hands In terms of special design the touch sensor can also disappear completely into a surface and be used for hidden operation Figure 7 compares the technologies Bottom line Although the majority of touchscreens today are based on the PCAP principle there are applications for which it is less suitable zForce technology offers the advantage of separate mounting the display surface is not influenced by the touchscreen This allows it to be designed according to other criteria for rugged use for operation with any object where actually touching the screen is not desired or where image quality must not be influenced by an additional layer over the display MHA Technologie Resistiv PCAP Infrarot zForce Diagonale 24 Zoll > 65 Zoll 42 Zoll 15 6 Zoll Optik + ++ ++ Integration + o + ++ Robustheit - ++ ++ ++ Vielseitigkeit o + o + Table 1 Comparison of common touch technologies Source Hy-Line Rudolf Sosnowsky received a degree from Darmstadt University in electrical electronic engineering He first worked in the development of automotive electronics and in LCD manufacturing He later moved on to Hy-Line Computer Components where he is engaged in the introduction of new technologies and selection of suppliers rsosnowsky@hyline de Figure 5 Use as light barrier left and proximity sensor right Figure 6 Sensor module from manufacturer Neonode right opening for transmitter and receiver photo Neonode image HY-Line Computer Components