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Multipoint SAW (surface acoustic wave) screen with locating axes with different frequencies

A surface acoustic wave and positioning axis technology, which is applied in the field of surface acoustic wave touch screens, can solve problems such as crosstalk between signals in different axes, achieve the effects of reducing screen interference, reducing processing difficulty, and facilitating signal processing

Inactive Publication Date: 2012-01-04
GENERALTOUCH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned problems existing in the existing surface acoustic wave touch screen, and provide a multi-point surface acoustic wave screen with different frequency positioning axes. The present invention selects different The matching emission frequency overcomes the fact 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, and the sound waves of different axes pass through other stripe arrays, causing crosstalk between signals in different axes At the same time, using the different characteristics of surface acoustic waves of different frequencies when passing through the stripe array 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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  • Multipoint SAW (surface acoustic wave) screen with locating axes with different frequencies
  • Multipoint SAW (surface acoustic wave) screen with locating axes with different frequencies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The dual-point touch screen is to add the Z axis on the basis of the X and Y axes of the single-point touch screen. The X and Y positioning axes are transmitted at a frequency of 4.5Mhz-3.5Mhz (the X and Y axes can also be transmitted at different frequencies) ); the Z positioning axis adopts the frequency transmission of 6Mhz-5Mhz, the specific method is as follows.

[0032] Adjust the reference frequency of the X and Y transmitting transducers to 4.5Mhz-3.5Mhz, the reference frequency of the X and Y receiving transducers to 4.5Mhz-3.5Mhz, and the frequencies of the X and Y transmitting stripe arrays and receiving stripe arrays at 4.5Mhz -3.5Mhz, according to V=f*λ, adjust the stripe array arrangement, and place the X, Y emitting stripe array and receiving stripe array at the upper and lower edges of the long side of the screen. The X, Y transmitting transducers and receiving transducers correspond to the X, Y transmitting and receiving fringe arrays.

[0033] Adjust th...

Embodiment 2

[0039] A multi-point surface acoustic wave screen with different frequencies for positioning axes, comprising a controller, an X-axis positioning device, a Y-axis positioning device, and a Z-axis positioning device, and any one of the X-axis positioning device, the Y-axis positioning device, and the Z-axis positioning device The shaft positioning device and the other two shaft positioning devices use different frequencies of sound wave transmission, and the longer the distance of the stripe array, the lower the sound wave frequency used.

[0040] In the X-axis positioning device, the reference frequency of the transmitting transducer and the receiving transducer is 3Mhz-2Mhz, and the frequency of the corresponding transmitting stripe array and receiving stripe array is 3Mhz-2Mhz; in the Y-axis positioning device, the transmitting transducer The reference frequency of the transmitter and the receiving transducer is 4.5Mhz-3.5Mhz, and the frequency of the corresponding transmitti...

Embodiment 3

[0044] A multi-point surface acoustic wave screen with different frequencies for positioning axes, comprising a controller, an X-axis positioning device, a Y-axis positioning device, and a Z-axis positioning device, and any one of the X-axis positioning device, the Y-axis positioning device, and the Z-axis positioning device The shaft positioning device and the other two shaft positioning devices use different frequencies of sound wave transmission, and the longer the distance of the stripe array, the lower the sound wave frequency used.

[0045] In the X-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; in the Y-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 a...

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Abstract

The invention discloses a multipoint SAW (surface acoustic wave) screen with locating axes with different frequencies. The multipoint SAW screen comprises a controller, an X-axis locating device, a Y-axis locating device and a Z-axis locating device, wherein any one of the X-axis locating device, the Y-axis locating device and the Z-axis locating device and the other two axis locating devices perform acoustic wave transmission with different frequencies, and the longer the stripe array distance is, the lower the frequency of adopted acoustic wave is. In the invention, according to the lengths of the different stripe arrays (the X-axis, the Y-axis and the Z-axis), the different transmitting frequencies matching with the arrays are selected, thus overcoming the problem that the mutual crosstalk of different axial signals is caused when the theoretical 45 degrees or 135 degrees can not be ensured and different axial acoustic waves can not be ensured to pass through the other stripes arrays due to the straightness of the stripes and local deformations in an existing acoustic wave screen; meanwhile, the different characteristics of the SAWs with the different frequencies in the process of passing through the stripe arrays are utilized to adjust different axial signal intensities, so that the intensities of different axial electrical signals are consistent basically, thereby being beneficial to 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 Applications(China)
IPC IPC(8): G06F3/043
Inventor 张萍蒲彩林李海涛
Owner GENERALTOUCH TECH
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