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Acoustic pulse wave identification touch technology

the acoustic pulse wave identification touch technology (abbreviated as APR) of ELO touchsystems Inc., the global leader in touch screen technology, is a new and unique sensory touch technology. American easy touch system company (hereinafter referred to as easy touch) is a subsidiary of Tyco Electronics, the world's largest manufacturer of electrical and electronic components

it is only composed of a glass cover that can be installed on the display and a small electronic control board. The easy touch APR technology has all the advantages of other touch technologies

APR glass overlay APR controller card

APR touch technology combines the advantages of good optical performance, excellent durability and stability of ultrasonic touch technology (SAW) and infrared touch technology (IR); There are also the advantages of capacitive touch technology (capacity) excellent drag and available touch pens, gloves, fingernails; And it also has the advantage of low price of resistance technology; In addition, APR has a good resistance to water and other pollutants. It can also be divided into touch screens of different sizes, from small touch screens suitable for PDA to large touch screens for 42 inch display. When signing words, it can well eliminate the wrong touch problems caused by palm

compared with many of the best inventions in history, APR measures the position of the contact point on the glass in a simple and elegant way of sound recognition. The key is that each position on the glass will produce a unique sound when contacted. Four tiny transceivers attached to the edge glass of the touch screen receive the touch sound, which is digitized by the controller, and then compared with the list of sounds at each position on the glass recorded in advance, the cursor position is immediately updated to the touch position. The design of APR can ignore external and surrounding noises, because they do not match the previously recorded recordings

apr is different from other technologies that try to identify the touch position with a transceiver or microphone. It uses a simple sound table search method rather than the way that does not have any reference and requires powerful and expensive signal processing hardware to try to calculate the touch position. Therefore, APR is the most cost-effective touch technology without size restrictions

from the leader of touch technology, the founder of easy touch invented touch screen resistive touch technology 35 years ago. Up to now, resistive is still the most widely used touch technology in the world, from PDA to industrial control equipment to restaurant POS terminals. Easy to touch five wire resistive is the most widely respected brand on the resistive touch screen

with the most patents and the world's largest touch display supplier, today easy touch can provide all major touch technologies, including resistance, capacitance, infrared, and sound waves - each technology is preferred to be suitable for specific applications and environments. Now, the APR technology provided by easy touch is a combination of technical advantages that no previous touch technology has achieved

although APR is a new technology, it is very similar to the sound wave technology that easy touch has been successfully applied for 20 years in some aspects. Both are sound principles, and use a piece of pure glass and a signal transceiver attached to it. However, the acoustic signal 10. The machined surface transceiver of instrument parts sends and receives signals, but APR only uses it to receive signals

because easy touch is a leader in acoustic touch technology, scientists and engineers of APR have rich experience in physics, materials, and manufacturing Easy touch effectively brings APR technology to the market, and it is firmly placed in a very unique position

apr action principle

apr consists of glass or other hard materials, and four signal receivers assembled on the back. The signal receiver is embedded in the opposite corner of the visible area and connected to the control card through cable

when the screen is touched, there is a collision or when the user pulls on the glass with his finger or stylus, there is a sound wave. The sound wave shoots from the contact point to the signal receiver, making it produce a proportional electronic signal. These signals are amplified in the control card and then converted into a digital message. These digital information are compared with the previously stored database to determine the location of the touch. APR touch technology is designed to prevent ambient and environmental noise, because these do not match the previously stored information

apr performance characteristics

touch displays usually need a touch screen covered on the LCD panel to feel touch and prevent the LCD panel from being touched. The goal of the display manufacturer is to make the display brighter and the color more pure, so the touch screen should avoid reducing the image quality as much as possible. Unfortunately, the touch screen may reduce image quality in four aspects: it will reduce light transmittance, increase surface reflection, reduce clarity, and change the original color. Glass is the best choice for choosing the material of touch screen for optical reasons, hardness and durability

the maximum light transmittance of pure glass is about 92% (per ASTM d1003). In this way, even if the cheap LCD display panel is used, the original brightness of the LCD can be well maintained

thin film layers and coatings used in resistance and capacitance touch technology will not only reduce light conduction, but also change the original color of the display panel. For many common touch applications, such as medical instruments and digital photo guides, pure glass is the only acceptable

pure glass can minimize reflection because it is not covered by thin film or metal coating. Reflection will make the eyes of long-term users easy to fatigue. For example, tellers or game players in gambling casinos, the display usually reflects the light on the ceiling, which will interfere with the users and distract them

because of the glass covering, the reflection is already a minimum, and the anti reflection or anti dazzle coating technology is not required, and it can also maintain the maximum clarity

glass is not easy to scratch. Compared with the hardness of 3H or 4H of resistive touch screen, the hardness of glass reaches 7h, while glass is resistant to most chemicals, unlike plastic materials that are easy to wear out. Glass is a relatively stable material that will not deform, expand or shrink due to temperature changes

special explosion-proof glass materials can also be used in high damage environments. Thickened, high-temperature and chemically treated hard glass can be used to replace ordinary glass

for these reasons, easy to touch acoustic technology has become the best choice among display machines or self-service machines used in public places, and is also preferred by other applications, including gambling and medical imaging. Due to the use of glass, APR technology has the advantages of good optics and durability

choice of stylus -- if optical quality and harsh environment are the only problems, then acoustic touch technology can be applied to all touch fields. But for some special applications, the choice of stylus can be better than visual effects. For example, the use of tellers or waiters in restaurants. When displaying a menu, perfect picture quality and pure color are not necessary. More importantly, when the waiter has a plate in the other hand, he can touch the monitor with a pen, credit card, or employee card, or with a fingernail or pen. For these reasons, although the resistive touch technology will reduce optics and wear the plastic layer on the outside of the resistive touch screen over time, the resistive touch screen is still the most commonly used technology in retail, restaurants, and POS applications

in addition to the excellent optical quality of sound wave technology and the characteristics that it is not easy to be worn, APR technology also has the characteristics that its resistance technology can be touched by fingers, nails, pens or touch pens, or credit cards

anti pollution - the main problem in some applications is not optics, durability, or the choice of stylus, but pollutants. Resistance and capacitance technology has advantages in this regard. It can operate normally when encountering liquids and other pollutants on the screen, and it can also be easily sealed. However, resistance technology is still ahead of capacitance technology in restaurant, industrial and medical applications, because it can be touched even with gloves

apr technology is resistant to pollutants on the screen, such as liquid, soil, tomato sauce, grease, and ultrasonic gel, and also prevents scratches. The APR touch screen can be sealed in an impervious manner with industrial sealing standards. It also has the optical properties of glass and resistance to cleaning and anti-inflammatory chemicals. It can also be touched with gloves and any kind of stylus

stability -- the touch screen and the display located below each have an independent coordinate system. The position of the corresponding touch and display needs to be converted from one coordinate system to another by regular operation. The conversion accuracy depends on the stable touch and stable image coordinate system. LCD display is different from CRT display. It has a fixed position to make the upper and lower jaws not concentric. Some design ranges are 80000 tons of high white aluminum hydroxide and 66000 tons of soluble aluminum hydroxide per year. For example, some touch technologies, such as acoustic and infrared technologies, have a fixed coordinate system. Other technologies, such as capacitors and some cheap resistors, will require re correction, or periodic correction after a period of time. This is the so-called offset

in all cases, the best touch technology never needs calibration. APR has a fixed coordinate system, which does not change with time, location, or environmental changes. If the size and position of the display is fixed, the correction required by the traditional touch screen will be eliminated in the application with APR touch technology

fast and sensitive - touch technology should be easy to touch and respond quickly to taps. APR will not be unable to recognize short touch like other technologies, because a short tap will also produce a recognizable sound. Most touch applications require simple and rapid touch, and are designed for users in public places and employees with little training. Common personal computer techniques such as mobile, pull-down menu, and drag and drop are rarely used in touch applications, because these are not intuitive to all users. However, some technology applications still use these, and gambling sometimes requires drag. Capacitance is usually the best drag option in touch technology

apr can recognize fast taps, and it can also be dragged like a capacitor. Unlike capacitive technology, APR also allows you to drag with your fingers and stylus. APR is currently impossible in the action of "touch and stop" or "pull and stop", because there is no sound in the stopped position

simple structure, sealable, and narrow frame - equipment manufacturers (OEMs do not add additional construction links s) are looking for touch technology components that are easy to integrate. In addition, their applications need to meet the basic touch characteristics mentioned earlier. The touch screen needs to have the characteristics that it is not affected by the surrounding metal materials and can operate normally in a rough environment. They should be able to be sealed with a variety of materials, including gaskets, mastics, or rtvs in accordance with NEMA 4/IP 65 standards, and must have the smallest possible frame. The size of the ideal touch screen should be larger than the LCD display

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