חיישן מגע גלים אקוסטיים הוא שכבת כיסוי זכוכית על פני הצג. מתמרי X ו-Y מרותכים על הפינות הסמוכות של הזכוכית ומחוברים לבקר באמצעות זוג כבלים מסוככים. כל זוג כבלים מחובר בהתאמה לקו האות ולקו הארקה. מגן משולש מגן על מתמרי X ו-Y ועל הכבלים המחוברים. מערך פסי השתקפות זווית של 45 מעלות נחרט לאורך שני צידי הזכוכית כמנחה גלים. המשקפים מנוגדים זה לזה. הקצוות מלוטשים כדי להבטיח הד אקוסטי נכון.
The touch sensor can be laminated on any thickness of glass to increase durability, riot resistance and safety. It can also be laminated directly on CRT or flat panel displays. Use silicone gel as the lamination medium.
Acoustic bulk wave touch screen technology is based on transmitting high-frequency sound waves through the touch sensor covering the surface of the display. The detection work is to continuously monitor the touch sensor to determine whether there is a touch. It includes the following processes
(1) Transmit sound waves and wait for reflected wave response.
(2) Digital reflected wave response.
(3) Analyze the signal and determine the touch activity.
(4) Send the verification result to the host.
transmit and receive sound waves
X and Y transducers alternately emit sound waves (in transmission mode). The transducer is installed in the upper left corner of the sensor and converts electrical pulses into sound waves. The transducer emits multi{{0}}cycle ultrasonic waves into the sensor glass at a velocity of 0.135 inches/microsecond.
The sound wave propagates along the reflection fringe, is reflected by the reflection fringe to the opposite light edge, and then reflected back to the fringe array, and then converted to the transducer (in receiving mode). The first reflector sends a signal back, then the second, the third, and so on. Then decompose the anti-lr signal to separate the noise from the effective information.
Digital reflection signal
X or Y transducer receives the reflected signal, amplifies and demodulates the signal and converts it into a digital signal. Adjust the amplitude if necessary.
Analyze digital signals
Fingers or other media that can absorb sound waves touch the sensor, which absorbs the energy of the sound waves and reduces the amplitude of the waves. This energy attenuation appears on the signal as a drop in amplitude. The touch is detected by comparing the current digitized data with the previous detection or reference data. The different results of the current and previous data are processed through the digital filter to determine whether there is a touch and a touch position on the sensor (brother: K is the coordinate, Z is the pressure axis).
Send the test result to the host
The controller transmits the coordinates to the main processor, and the main processor processes the data for use by the application program.
