Description
LTC391AE01 HIEE401782R0001 Controller module
LTC391AE01 HIEE401782R0001 Controller module
Module Clips Drive controller servo moto
LTC391AE01 HIEE401782R0001 Controller moduleSuitable 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
4.2 Working principle of surface acoustic wave touch screen
Take the X-axis transmitting transducer in the lower right corner as an example: The transmitting transducer converts the electrical signal sent from
the controller through the touch screen cable into sound wave energy and transmits it to the surface on the left, which is then reflected by a set
of precision reflection stripes under the glass plate. The sound wave energy is reflected into an upward uniform surface and transmitted. The sound
wave energy passes through the surface of the screen, and then is gathered into a line to the right by the upper reflection stripes and transmitted to the
X-axis receiving transducer. The receiving transducer will return the surface acoustic wave. The energy becomes an electrical signal. When
the transmitting transducer emits a narrow pulse, the sound wave energy reaches the receiving transducer through different paths. The one on the far right arrives
earliest, and the one on the far left arrives last. The early and late arrivals are superimposed into one For a wider waveform signal, it is not difficult to see that the received
signal collects all the sound wave energy that has returned after different long and short paths in the X-axis direction. The distance they have traveled on the Y-axis is the same,
but on the The nearest one has traveled twice the maximum distance on the X-axis. Therefore, the time axis of this waveform signal reflects the position of each original waveform
before superposition, which is the X-axis coordinate. When there is no touch, the waveform of the received signal is exactly the same as the reference waveform. When a finger or
other object that can absorb or block sound wave energy touches the screen, the sound wave energy traveling upward along the X-axis through the finger is partially absorbed, which is
reflected in the received waveform, that is, there is an attenuation gap in the waveform at a certain moment. The received waveform
corresponds to the signal attenuation of a gap in the part blocked by the finger. Calculating the position of the gap means that the touch coordinate controller analyzes the attenuation of
the received signal and determines the X coordinate based on the position of the gap. Then the same process for the Y axis determines the Y coordinate of the touch point. In addition to the
X and Y coordinates that general touch screens can respond to, surface acoustic wave touch screens also respond to the third axis Z-axis coordinates, which means they can sense the value
of the user”s touch pressure. The principle is calculated from the attenuation of the received signal attenuation. Once the three
axes are determined, the controller transmits them to the host.
4.3 Characteristics of surface acoustic wave touch screen
The clarity is higher and the light transmittance is good. Highly durable and good in scratch resistance (compared to surface film on resistors, capacitors, etc.). Very responsive. Not affected
by environmental factors such as temperature and humidity, high resolution and long life (50 million times with good maintenance); high
light transmittance (92%), able to maintain clear and translucent image quality; no drift, only required during installation One-time correction;
there is a third axis (i.e. pressure axis) response, which is currently used more in public places. Surface acoustic wave
screens require regular maintenance, because dust, oil and even beverage liquids contaminating the surface of the screen will block the wave
guide groove on the surface of the touch screen, preventing the waves from being emitted normally, or causing the waveform to change and the
controller to be unable to recognize it normally, thus affecting the performance of the screen. For normal use of the touch screen, users must pay strict
attention to environmental hygiene. The surface of the screen must be wiped frequently to keep it smooth, and a complete wipe must be performed regularly.
surface acoustic wave screen
The three corners of the sound wave screen are respectively pasted with transducers for transmitting and receiving sound waves in the X and Y directions
(transducer: made of special ceramic materials, divided into transmitting transducers and receiving transducers. It controls The electrical signal sent by the
device through the touch screen cable is converted into sound wave energy and the surface acoustic wave energy formed by the reflection stripes is converted
into an electrical signal.), the four sides are engraved with reflection stripes that reflect surface ultrasonic waves. When a finger or soft object touches the screen,
part of the sound wave energy is absorbed, thus changing the received signal. After processing by the controller, the X and Y coordinates of the touch are obtained.
Contact: Mr. Lai
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1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
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YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
