Description
3BHE030579R0003 Protective devices
3BHE030579R0003 Protective devices
Module Clips Drive controller servo moto
3BHE030579R0003 Protective devicesSuitable for steel manufacturing, thermal power generation, hydroelectric power generation, nuclear power generation, wind power generation, gas supply, and other glass manufacturing, paper mills, mechanical manufacturing, electronic manufacturing, automotive manufacturing, aviation manufacturing, chemical manufacturing, coal mining and selection, oil and natural gas mining and selection, metal mining and selection, and non-metallic mining and selection
1.2 Five-wire resistive screen
The base layer of the five-wire resistance technology touch screen adds voltage fields in both directions to the conductive working surface of the glass
through a precision resistor network. We can simply understand that the voltage fields in both directions are applied to the same working surface in
a time-sharing manner. The outer nickel-gold conductive layer is only used as a pure conductor. There is a method of detecting the X-axis and Y-axis
voltage values of the inner ITO contact point time-sharing after touching to measure the position of the touch point. The five-wire resistive touch screen
requires four leads in the inner layer of ITO, and only one conductor in the outer layer. The touch screen has a total of 5 leads. Features: High resolution
, high-speed transmission response. High surface hardness reduces abrasions, scratches and resists chemical treatments. It can still be used after 30
million contacts with the same point. Conductive glass is the base material. Once calibrated, it has high stability and will never drift. The five-wire
resistive touch screen has the disadvantages of high price and high environmental requirements.
1. 3 Limitations of resistive screens
Whether it is a four-wire resistive touch screen or a five-wire resistive touch screen, they are a working environment that is completely isolated from the
outside world. They are not afraid of dust and water vapor. They can be touched by any object and can be used to write and draw. They are more suitable
for the field of industrial control. and limited-person use within the office. A common disadvantage of resistive
touch screens is that because the outer layer of the composite film is made of plastic
material, uninformed people may scratch the entire touch screen if they touch it too hard or use a sharp object,
causing it to be scrapped. However, within
limits, scratches will only damage the outer conductive layer. Scratches on the outer conductive layer do not
matter for five-wire resistive touch screens, but are fatal for four-wire resistive touch screens.
2. Capacitive touch screen
2.1 Capacitive technology touch screen
It works by using the human body”s current induction. The capacitive touch screen is a four-layer composite glass screen. The inner surface and
interlayer of the glass screen are each coated with a layer of ITO. The outermost layer is
a thin layer of silica glass protective layer. The interlayer ITO coating serves as the working surface. Four electrodes are drawn out, and the inne
r ITO layer is a shielding layer to ensure a good working environment. When a finger touches the metal layer, due to the electric field of the human
body, a coupling capacitance is formed between the user and the touch screen surface. For high-frequency current, the capacitance is a direct conductor,
he four corners. The controller obtains the position of the touch point by accurately calculating the ratio of these four currents. .
2.2 Defects of capacitive touch screens
The light transmittance and clarity of the capacitive touch screen are better than the four-wire resistive screen, but of course it cannot be compared with
the surface acoustic wave screen and the five-wire resistive screen. The capacitive screen is seriously reflective, and the four-layer composite touch screen
with capacitive technology has uneven transmittance of light of various wavelengths, causing color distortion. Due to the
reflection of light between the layers, the image characters are also blurred. In principle, the capacitive screen uses the human body as an electrode of
a capacitor element. When a conductor is close to the interlayer ITO working surface and a sufficient capacitance is coupled, the current flowing away is
enough to cause the capacitive screen to malfunction. . We know that although the capacitance value is inversely proportional to the distance between the
poles, it is directly proportional to the relative area, and is also related to the insulation coefficient of the medium. Therefore, when a larger area of the palm or a
conductive object is held close to the capacitive screen instead of touching it, it can cause the capacitive screen to malfunction. In humid weather
, this situation is particularly serious. Putting your body within 15 cm of the monitor can cause the capacitive screen to malfunction. Another disadvantage of capacitive
screens is that they do not respond when touched with a gloved hand or a non-conductive object, due to the addition of a more insulating medium. The main disadvantage of the
capacitive screen is drift: when the ambient temperature and humidity change
, and the environmental electric field changes, it will cause the capacitive screen to drift, causing inaccuracy. For example: the temperature rise of the monitor after turning on the
screen will cause drift: when the user touches the screen while the other hand or side of the body is close to the monitor, it will drift; larger objects near the capacitive touch screen
will drift after being moved, and if someone comes around to watch when you touch the screen, it will drift. Will cause drift; The reason for the drift of the capacitive screen is due to
inherent technical shortcomings. Although the environmental potential surface (including the user”s body) is far away from the capacitive touch screen, it is much larger than the finger
area. They directly affect the determination of the touch position. In addition, many relationships that should be linear in theory are actually non-linear. For example, people with different
weights or fingers with different degrees of wetness draw different total currents, and the changes in the total current and the changes in the four partial currents It is a non-linear relationship.
The four-corner custom polar coordinate system used by the capacitive touch screen does not have an origin on the coordinates. The controller cannot detect and recover after drifting. Moreover,
after the four A/Ds are completed, the four points are The calculation process from the flow value to the X and Y coordinate values of the touch point on the rectangular coordinate system is
complicated. Since there is no origin, the drift of the capacitive screen is cumulative and calibration is often required at the job site. The outermost silica protective glass of the capacitive touch
screen is very scratch-resistant, but it is afraid of being hit by nails or hard objects. Knocking out a small hole will damage the interlayer ITO, whether it is damage to the interlayer ITO or damage
during installation and transportation. With the ITO layer on the inner surface, the capacitive screen cannot work properly. [!–empirenews.page–]
Contact: Mr. Lai
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