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Ultrasonic sensor turns any material surface into a touch button
[ Instrument Network Instrument R & D ] With the advancement of technology, the use of touch sensing as an interface is becoming increasingly popular.
According to foreign media reports, the emerging company UltraSense Systems has developed an ultrasonic sensing technology for touch user interfaces. This ultrasonic sensing technology can create touch interfaces from materials of almost any thickness, including metals, glass, wood, ceramics, and plastics, without being affected by moisture, dirt, grease, and lotions. Any surface becomes a virtual button or gesture.
It is reported that UltraSense is using the technology in its contact point ultrasonic sensor series. These contact point ultrasonic sensors have been sampled and are expected to be included in multiple consumer and industrial equipment in 2020.
According to the company, the contact point ultrasonic sensors include strain gauges, force touch, and surface acoustic wave solutions that have extensive industrial and mechanical design constraints such as material thickness, integration complexity, and production calibration time. The use of ultrasound helps minimize integration difficulties and speed up production calibration. Basically, the contact point ultrasonic sensor is composed of an ASIC and a MEMS sensor. ASICs include microcontrollers, low power, memory, and analog front ends. MEMS transducer is a piezoelectric micromechanical transducer, referred to as PMUT.
It is reported that the contact point of UltraSense does not exceed the size of the pen tip (1.4 × 2.4 × 0.49mm in the optical LGA package) and is described as the smallest ultrasonic sensor on the chip. In always-on mode, its power consumption is less than 20uA. They are designed to run independently of the product's main processor and embed all algorithmic processing into the sensor. The entire product can be powered on with a simple touch, and these sensors can be used as standalone power buttons, volume controls, or shortcut keys for touch wake-up sensing. They can also form a multi-functional user interface through a series of clicks, holds, and swipes, and the sensors can directly interface with power management and tactile driver chips.
For applications that do not require low power consumption, some contact point sensors include large actuators with higher operating voltages, which can transmit ultrasonic beams through very thick solid metals. You can also turn off the transducer and use sensors to drive piezoelectric materials to cost-effectively support larger touch-sensitive areas, such as mouse pads in laptops or touch pads in car consoles.
UltraSense's product line addresses the requirements of smartphones, consumer / IoT, automotive and industrial user interfaces. UltraSense says the ultrasonic sensing technology will allow OEMs to remove mechanical buttons from their smartphones, thereby providing a new industrial design for the next generation of 5G phones. In addition, this technology can also be used in wearable devices to implement touch interfaces or sliders on thick home appliances made of stainless steel, glass, plastic, and ceramic. Another possibility is to design virtual buttons located on the center of the steering wheel and on the front panel of the vehicle on solid surfaces that are easy to clean in rides and shared vehicles.
"We have seen a shift in the way devices interact, digital devices have replaced mechanical devices, and the migration to virtual buttons and surface gestures is accelerating. Ultrasound on touch screens Applications in the user interface have not been realized in such a novel way until now. Our family of touchpoint ultrasonic sensor solutions supports new use cases, enabling OEMs to use multiple touch and Gestures bring a differentiated user experience. "