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Direct acoustic surface wave touch screen

A surface acoustic wave and touch screen technology, applied in the field of computer multimedia control, can solve the problems of affecting convenience, scrapping the touch screen, increasing the cost of use, etc., and achieve the effects of being conducive to popular use, simplifying production processes, and prolonging service life.

Inactive Publication Date: 2007-03-21
BEIJING UNITOP NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This undoubtedly greatly affects the convenience of use and greatly increases the maintenance cost of touch screen application equipment
Furthermore, the manufacturing process of the above-mentioned reflective stripes is relatively complicated, which increases the production cost of the touch screen and limits the popularity of use.
In addition, since this touch screen has only two sets of ultrasonic transducers, once a transducer fails, the touch screen will be scrapped.
And because the ultrasonic transmitter works in the state of high pulse power for a long time, the probability of failure is very high, which will shorten the average working life of the touch screen, which is equivalent to increasing the cost of use

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0026] It can be seen from Figure 1 and Figure 2 that if there is no touch object that absorbs ultrasonic waves, the ultrasonic pulses emitted by the ultrasonic transmitter E can be received by the bar receiver located opposite the transmitter and at a distance D from the transmitter ; At this time, the ultrasonic wave spreads around the surface of the base plate with the transmitter as the center of the circle. After a period of propagation time T, the receiver will receive the ultrasonic wave and generate an electrical signal. If the propagation speed of the ultrasonic wave in the bottom plate (hereinafter referred to as the speed of sound) is represented by v, then there is

[0027] D=vT

[0028] Because the distances between the two ends of the receiver R and the transmitter are different, one end is the closest to the transmitter, and is farther and farther away from the transmitter along the long axis of the receiver, so that the ultrasonic pulse 101 will start f...

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Abstract

The direct acoustic surface wave touch screen includes emitter mounted in the corner of the touch substrate and striped receiver in the edge of the substrate. Through detecting the voltage drop time in the receiver-output voltage pulse signal envelop after the different ultrasonic waves are emitted by the emitters and absorbed by the touched matter, a linear equation set determined by two different emitters and one touch point and thus the coordinates of the touched point may be obtained. Because several ultrasonic wave emitters may be mounted in the touch substrate, the redundant design of the system may be realized via selecting different transducer combinations.

Description

technical field [0001] The invention relates to a touch screen for detecting touch points by means of ultrasonic waves conducted on a rigid surface, belonging to the technical field of computer multimedia, in particular to the technical field of computer multimedia control. The invention is applicable to the man-machine interaction interface of various digital information equipment with microprocessor as the core. Background technique [0002] Existing surface acoustic wave touch screens are all designed based on the technologies disclosed in US Patents 4,644,100, 4,645,870, 4,700,176, 4,791,416, 4,880,665, 4,642,423 and 6,441,809 and other patents internally referenced. The core content of these technologies is to use two groups of "reflection stripes" that can partially transmit ultrasonic waves on the two sides of the touch panel of the touch screen at an angle of 45° to the edge of the touch panel, and transmit the ultrasonic transmitter installed at one corner of the to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/14G06K11/06G08C21/00G09G3/00
Inventor 刘新斌
Owner BEIJING UNITOP NEW TECH CO LTD
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