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Surface acoustic wave touch screen with locating axes of different frequencies

A surface acoustic wave and touch screen technology, applied in the field of surface acoustic wave touch screen, can solve the problems of signal crosstalk and cannot guarantee 45 degrees or 135 degrees, etc., to reduce processing difficulty, facilitate signal processing, and reduce screen interference.

Active Publication Date: 2015-02-04
GENERALTOUCH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned problems existing in the existing surface acoustic wave touch screen, and to provide a surface acoustic wave touch screen with different frequency positioning axes. frequency, which overcomes the problem that the existing acoustic wave screen cannot guarantee the theoretical 45 degrees or 135 degrees due to the straightness and local deformation of the stripes, which causes crosstalk between signals in different axes; at the same time, the surface acoustic waves of different frequencies are used to pass through the stripe array The different characteristics of the time can also adjust the signal strength of different axes, so that the strength of electrical signals in different axes is basically the same, which is beneficial to the signal processing of the controller

Method used

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  • Surface acoustic wave touch screen with locating axes of different frequencies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] There are only two axes, X and Y, in the single-point touch screen. The X positioning axis adopts the frequency transmission of 4.5Mhz-3.5Mhz; the Y positioning axis adopts the frequency transmission of 6Mhz-5Mhz. The specific method is as follows.

[0026] Adjust the reference frequency of the X transmitting transducer at 4.5Mhz-3.5Mhz, the reference frequency of the X receiving transducer at 4.5Mhz-3.5Mhz, the frequency of the X transmitting stripe array and receiving stripe array at 4.5Mhz-3.5Mhz, according to V =f*λ, adjust the arrangement of the fringe array, and place the X emitting fringe array and receiving fringe array on the upper and lower edges of the long side of the screen. The transmitting transducer and the receiving transducer of X correspond to the X transmitting and receiving fringe arrays.

[0027] Adjust the reference frequency of the Y transmitting transducer at 6Mhz-5Mhz, the reference frequency of the Y receiving transducer at 6Mhz-5Mhz, the freq...

Embodiment 2

[0034]In the single-point touch screen, there are only two axes, X and Y, among which the X positioning axis adopts the frequency transmission of 3Mhz-2Mhz; the Y positioning axis adopts the frequency transmission of 4.5Mhz-3.5, the specific method is as follows.

[0035] Adjust the reference frequency of the X-emitting transducer to 3Mhz-2Mhz, the reference frequency of the X-receiving transducer to 3Mhz-2Mhz, and the frequency of the X-emitting stripe array and receiving stripe array to 3Mhz-2Mhz, according to V=f*λ, adjust The stripe array is arranged, and the X emitting stripe array and the receiving stripe array are placed at the upper edge and the lower edge of the long side of the screen body. The transmitting transducer and the receiving transducer of X correspond to the X transmitting and receiving fringe arrays.

[0036] Adjust the reference frequency of the Y transmitting transducer at 4.5Mhz-3.5, the reference frequency of the Y receiving transducer at 4.5Mhz-3.5, ...

Embodiment 3

[0043] A surface acoustic wave touch screen with different frequencies for positioning axes, including a controller, an X-axis positioning device, and a Y-axis positioning device. The X-axis positioning device and the Y-axis positioning device use different frequencies of sound wave transmission, and the longer the stripe array is, the more the frequency of the sound wave used lower.

[0044] Specifically, in the X-axis positioning device, the reference frequency of the transmitting transducer and the receiving transducer is 6Mhz-5Mhz, and the frequency of the corresponding transmitting stripe array and receiving stripe array is 6Mhz-5Mhz; in the Y-axis positioning device, The reference frequency of the transmitting transducer and the receiving transducer is 4.5Mhz-3.5Mhz, and the frequency of the corresponding transmitting stripe array and receiving stripe array is 4.5Mhz-3.5Mhz.

[0045] Moreover, the reference frequency bandwidth of the X-axis transducer and the Y-axis tran...

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Abstract

The invention discloses a surface acoustic wave touch screen with locating axes of different frequencies. The surface acoustic wave touch screen comprises a controller, an X-axis locating device and a Y-axis locating device. The X-axis locating device and the Y-axis locating device transmit acoustic waves of different frequencies. The longer stripe arrays are, the lower used acoustic wave frequencies are. According to lengths of the stripe arrays in different axial locating devices, different matched transmitting frequencies are selected. The mutual interference problem of different axial signals caused by unwarrantably of 45 DEG or 135 DEG because of the straightness and the local deformation of the stripes in the current acoustic wave screen is solved. Simultaneously, signal strengths in different axial directions can be adjusted by utilizing different characteristics of acoustic surface waves of different frequencies in the event of passing through the stripe arrays, therefore, electrical signal strengths in different axial directions are the same basically; and the surface acoustic wave touch screen is advantageous for signal processing of the controller.

Description

technical field [0001] The invention relates to a surface acoustic wave touch screen, in particular to an acoustic wave touch screen capable of anti-interference and improving surface acoustic wave performance. Background technique [0002] Current touch screens mainly include surface acoustic wave, infrared, resistive, capacitive and other types. The surface acoustic wave touch screen has the characteristics of high resolution, short response time, good stability, good anti-riot performance, and good light transmission; the infrared touch screen has general resolution, long response time, general stability, good anti-riot performance, and light transmission. Good, easy to be interfered by light and other characteristics; resistive touch screen has the characteristics of high resolution, short response time, good stability, poor light transmission, poor riot resistance, etc.; capacitive touch screen has high resolution, short response time, general stability, light trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/043
Inventor 张萍蒲彩林李海涛
Owner GENERALTOUCH TECH
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