CN103472960A - Method for realizing multi-point real touch on surface acoustic wave touch screen - Google Patents

Method for realizing multi-point real touch on surface acoustic wave touch screen Download PDF

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CN103472960A
CN103472960A CN2013102350132A CN201310235013A CN103472960A CN 103472960 A CN103472960 A CN 103472960A CN 2013102350132 A CN2013102350132 A CN 2013102350132A CN 201310235013 A CN201310235013 A CN 201310235013A CN 103472960 A CN103472960 A CN 103472960A
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receiving
surface acoustic
touch
transducer
acoustic wave
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CN103472960B (en
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罗琳
张萍
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Chengdu Ji sharp epoch touching technique company limited
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CHENGDU GENERAL TOUCH TECHNOLOGY Co Ltd
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Priority to CN201710120856.6A priority Critical patent/CN106886343B/en
Priority to CN201310235013.2A priority patent/CN103472960B/en
Priority to CN201710121204.4A priority patent/CN106909257B/en
Priority to CN201710120570.8A priority patent/CN106843604B/en
Priority to CN201710121205.9A priority patent/CN106843605B/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • G06F3/0433—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves in which the acoustic waves are either generated by a movable member and propagated within a surface layer or propagated within a surface layer and captured by a movable member
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Abstract

The invention discloses a method for realizing multi-point real touch on a surface acoustic wave touch screen. The method comprises the following steps that (1), a group of transmitting transducer arrays or receiving transducer arrays are at least arranged on the X axis or the Y axis; (2), a transmitting circuit drives transmitting transducers to transmit a surface acoustic wave signal, and a receiving circuit controls receiving transducers to receive the surface acoustic wave signal; (3), when a touch body touches the surface acoustic wave touch screen, the surface acoustic wave signal reaches the receiving transducers after being reflected by the touch body; when the surface acoustic wave signal intensity is greater than a set threshold value, the receiving circuit sends the surface acoustic wave signal to an MCU (microprocessor control unit), and the MCU determines the coordinates of the touch body. By the method, the multi-point real touch response of two or more points is realized, ghost points are eliminated fundamentally, and moreover, the touch response of unlimited points in a touch area can be really realized by the conventional process.

Description

A kind of method realized in surface acoustic wave touch screen multiple spot actual touch
Technical field
The present invention relates to a kind of surface acoustic wave touch screen, relate in particular to a kind of method realized in surface acoustic wave touch screen multiple spot actual touch.
Background technology
Current touch-screen mainly contains the types such as surface acoustic wave, infrared and electric capacity, the surface acoustic wave touch screen advantage such as resolution is high, the response time is short, environmental adaptation is strong owing to having, good stability, light transmission are good wherein, become the touch-screen of tool promotional value in several main flow touch-screens.
Existing general surface acoustic wave touching screen only has X-axis and two orthogonal physical positioning axles of Y-axis, can accurately identify a touch point and obtain unique one group of position coordinate data based on the axes intersect principle, but while operating for two or more touch points simultaneously, the combinatorial coordinates of three or four positions for example may appear during two touch points, the combinatorial coordinates of wherein one or two position is terrible point coordinate, causing the touch point of report is not real touch point, this just makes surface acoustic wave touch screen will lose efficacy when multiple spot touches simultaneously, greatly limited the development of surface acoustic wave touch screen.
Therefore, in prior art, proposed to start with and address the above problem from the software and hardware both direction respectively:
The first, from software, surface acoustic wave touch field touches firmware by upgrading, touches body and when entering touch area, adopts time-sharing approach or subregion method to realize that on software the touch point two point detects, and is called for short soft two point;
Wherein two touch bodies of time-sharing approach requirement must be in different time points when point touching is regional first, two time point intervals at least need to differ a touch-screen response time, as 10.4ms, after first touches body point touching zone, touch system has detected first true touch point, and record the true coordinate position of this touch point, behind second the touch any time point touching zone of body after 10.4ms, to I haven't seen you for ages, one or two coordinate axis data newly appear, an X coordinate or Y coordinate time for example newly appear, fixer system can be Y coordinate or the X coordinate of emerging X coordinate or Y coordinate matching disappearance automatically, the Y coordinate of described disappearance or X coordinate come from the coordinate axis data of X coordinate of new appearance or first touch body of Y coordinate time.If, with a stylish X coordinate and the Y coordinate of having occurred, fixer system is matched emerging X coordinate and Y coordinate automatically, has identified second real touch point.But being limited as when processing the 3rd touch body point touching zone of time-sharing approach, when the 3rd touch body is positioned at the first two touch body crossover location, occur without new X coordinate or Y coordinate data, causes the 3rd touch body of None-identified.
And the subregion method requires touch-screen is partitioned into to several zones physically, such as X-axis being divided into to a lot of zonules, enter the release respective regions by the judgement touch point, distinguish true point from ghost point, for example in prior art, touch bodies point touching zones simultaneously when two, and two touch points are during without identical X and Y coordinates axle, firmware can collect two X coordinates and two Y coordinates simultaneously, when X and Y pairing, there will be two terrible points, cause two actual positions that touch body of None-identified.But because the subregion method has gone out many zoness of different by the touch-screen physical segmentation, when the touch body is moved in touch area, tandem other zones that enters of meeting, two touch points, just can from ghost point, distinguish two true touch points by this front and back time difference, this principle still is similar to time-sharing approach.The critical defect of subregion method is None-identified multiple point touching in same subregion, the 3rd defect that touches body of None-identified still exists, for example two at first subregion touch the moment that body enters the second subregion simultaneously, the 3rd touches body and also clicks first at the moment the second subregion, because two touch points in the first subregion are None-identified, increased again the 3rd and touched body entering into second subregion moment, collect three different Y coordinates at the second subregion, two different X coordinates, six kinds of combinations are arranged during the fixer system coupling, wherein three kinds are combined as terrible point.
When in soft two point, the subregion method causes a plurality of touch body because of the imperfection on its principle from the above, error rate is higher, in time-sharing approach, except the time interval that many touches body is touched first, have requirement, it is very high that the effects on surface acoustic signals requires, cause surface acoustic wave touch screen realize in stable production more difficult.For example, when surface acoustic wave touch screen is made, especially large-sized surface acoustic wave touch screen, require the processing technology precision higher, striped serigraphy, baking temperature precision are higher, thereby increased manufacture difficulty, otherness between each surface acoustic wave touch screen is also larger simultaneously, causes the difficulty of steady production surface acoustic wave touch screen to increase.
Second, from hardware, China Patent No. " 200920298621.7 " discloses a kind of multi-point surface acoustic wave touch screen, its open day is on 09 08th, 2010, its technical scheme is that described multi-point surface acoustic wave touch screen comprises controller, X-axis locating device and Y-axis locating device, also comprise independently Z axis locating device, the Z axis locating device comprises two Z axis transmitting transducers that are arranged on the screen body, two Z axis receiving transducers, two groups of Z axis emission striped arrays and two groups of Z axis receive the striped array, two groups of Z axis emission striped arrays receive the striped array distribution with two groups of Z axis and become location to enclose at screen body quadrilateral, and screen body limit is parallel with corresponding Z axis emission striped array or Z axis reception striped array, the Z axis locating device forms Z axis, the X-axis locating device forms X-axis, the Y-axis locating device forms Y-axis, Z axis and X-axis and Y-axis intersect.
But increased the Z axis of an assisting sifting ghost point in this patent, can identify at most two physics touch bodies after increasing Z axis simultaneously, continue to increase by one group of U axle vertical with Z axis, can identify at most three physics simultaneously and touch body, therefore coordinate axis has the N group in theory, just can identify N-1 physics simultaneously and touch body, but increase coordinate axis group number and also need increase corresponding reflection strip array in touch-screen body surrounding, and surface acoustic wave signal is through too much producing a lot of hashs after group reflection strip array, and easily receiving transducer is received, thereby have a strong impact on fixer system coordinate identification point, demand is arranged in the space that increase many group reflection strip arrays needs wider touch-screen body surrounding to meet the reflection strip array simultaneously, the lightness of this and existing market demand, narrow limit, boundlessization and panelized touch-screen are opposing and speed, and also can't produce the surface acoustic wave touch screen of N group coordinate axis with existing processing technology.
Summary of the invention
The object of the invention is to overcome the above-mentioned problems in the prior art, a kind of method realized in surface acoustic wave touch screen multiple spot actual touch is provided, the present invention has realized and above multiple spot actual touch response at 2, fundamentally eliminated terrible point, and with existing technique just can really accomplish touch area without the point of accumulation touch-responsive.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of realization is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch, comprises the following steps:
(1), one group of transmitting transducer arrays formed by a plurality of transmitting transducers at least is set on X-axis or Y-axis, or one group of receiving transducer array formed by a plurality of receiving transducers at least is set;
(2), drive transmitting transducer acoustic waves signal by radiating circuit, by receiving circuit control receiving transducer receiving surface acoustic signals;
(3), when having the body of touch to touch, surface acoustic wave signal arrives receiving transducer after touching the body reflection, when surface acoustic wave signal intensity is greater than the threshold values of setting, receiving circuit is sent to CPU (central processing unit) MCU by this surface acoustic wave signal, and CPU (central processing unit) MCU determines the coordinate that touches body.
One group of transmitting transducer arrays at least is set on described X-axis, one group of receiving transducer array at least is set on described Y-axis, by radiating circuit, drive all transmitting transducers acoustic waves signal simultaneously; Control all receiving transducers receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers independent receiving surface acoustic signals successively by receiving circuit.
When having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections i, because the relative position coordinates of each receiving transducer is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=V* (t i-t 0)-Y i;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer, one of them receiving transducer Y after touching body 90 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=V* (t j1-t 0)-Y j;
The 2nd touches body: X j2=V* (t j2-t j1)+X j1, or X j2=V* (t j2-t 0)-Y j;
…………
N touches body: X jn=V* (t jn-t j1)+X j1, or X jn=V* (t jn-t 0)-Y j; The velocity of propagation that wherein V is surface acoustic wave signal, t 0for transmitting transducer starts the start time point of acoustic waves signal, t ifor receiving transducer receives the time point of surface acoustic wave signal, t first j1for Y jreceive the 1st time point that touches the surface acoustic wave signal of body, t j2for Y jreceive the 2nd time point that touches the surface acoustic wave signal of body, t jnfor Y jreceive n time point that touches the surface acoustic wave signal of body.
One group of transmitting transducer arrays at least is set on described X-axis, one group of receiving transducer array at least is set on described Y-axis, from any one transmitting transducer, drive separately successively transmitting transducer acoustic waves signal by radiating circuit, until all transmitting transducers all driven mistake once, finish once circulation; Control all receiving transducers receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers independent receiving surface acoustic signals successively by receiving circuit.
In described transmitting transducer arrays, transmitting transducer adds up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers, receiving transducer is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having the body of touch to touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections n, because the relative position coordinates of each transmitting transducer and receiving transducer is known, therefore determine that the coordinate that touches body is (X n, Y n).
One group of transmitting transducer arrays at least is set on described X-axis, a combination formed by single receiving transducer and reflection strip array at least is set on described Y-axis, from any one transmitting transducer, drive separately successively transmitting transducer acoustic waves signal by radiating circuit, until all transmitting transducers all driven mistake once, finish once circulation; Control receiving transducer receiving surface acoustic signals by receiving circuit.
In described transmitting transducer arrays, transmitting transducer adds up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers, receiving transducer is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer after touching body 90 degree reflections, and the time point that receiving circuit receives the 1st surface acoustic wave signal is t n1, the time point that receives the 2nd surface acoustic wave signal is t n2, the time point that receives m surface acoustic wave signal is t nm, because the relative position coordinates of each transmitting transducer is known, therefore the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y n1={ V*{t n1-[t 0+ (n-1) T] }-X n}/2,
The 2nd touches body: Y n2={ V*{t n2-[t 0+ (n-1) T] }-X n}/2,
…………
M touches body: Y nm={ V*{t nm-[t 0+ (n-1) T] }-X n}/2.
A combination formed by single transmitting transducer and reflection strip array at least is set on described X-axis, one group of receiving transducer array at least is set on described Y-axis, by radiating circuit, drive transmitting transducer to continue the acoustic waves signal; Control all receiving transducers receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers independent receiving surface acoustic signals successively by receiving circuit.
When having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections i, because the relative position coordinates of each receiving transducer is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=[V* (t i-t 0)-Y i]/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer, one of them receiving transducer Y after touching body 90 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=[V* (t j1-t 0)-Y j]/2;
The 2nd touches body: X j2=[V* (t j2-t j1)]/2+X j1, or X j2=[V* (t j2-t 0)-Y j]/2;
…………
N touches body: X jn=[V* (t jn-t j1)]/2+X j1, or X jn=[V* (t jn-t 0)-Y j]/2.
One group of transmitting transducer arrays and one group of receiving transducer array are set respectively on a wherein edge of described X-axis or Y-axis, by radiating circuit, drive all transmitting transducers acoustic waves signal simultaneously; Control all receiving transducers receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers independent receiving surface acoustic signals successively by receiving circuit.
When having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections i, because the relative position coordinates of each receiving transducer is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=V* (t i-t 0)/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer, one of them receiving transducer Y after touching body 180 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=V* (t j1-t 0)/2;
The 2nd touches body: X j2=V* (t j2-t j1)/2+X j1, or X j2=V* (t j2-t 0)/2;
…………
N touches body: X jn=[V* (t jn-t j1)]/2+X j1, or X jn=V* (t jn-t 0)/2.
One group of transmitting transducer arrays and one group of receiving transducer array are set respectively on a wherein edge of described X-axis or Y-axis, from any one transmitting transducer, drive separately successively transmitting transducer acoustic waves signal by radiating circuit, until all transmitting transducers all driven mistake once, finish once circulation; Control all receiving transducers receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers independent receiving surface acoustic signals successively by receiving circuit.
In described transmitting transducer arrays, transmitting transducer adds up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers, receiving transducer is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections n, because the relative position coordinates of each transmitting transducer and receiving transducer is known, therefore determine that this coordinate that touches body is (X n, Y n); When having a plurality of touch bodies to touch, the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y j1=V* (t j1-t 0)/2;
The 2nd touches body: Y j2=V* (t j2-t j1)/2+Y j1, or Y j2=V* (t j2-t 0)/2;
…………
N touches body: Y jn=[V* (t jn-t j1)]/2+Y j1, or Y jn=V* (t jn-t 0)/2.
One group of transmitting transducer arrays and a combination formed by single receiving transducer and reflection strip array are set respectively on a wherein edge of described X-axis or Y-axis, from any one transmitting transducer, drive separately successively transmitting transducer acoustic waves signal by radiating circuit, until all transmitting transducers all driven mistake once, finish once circulation; Control receiving transducer receiving surface acoustic signals by receiving circuit.
In described transmitting transducer arrays, transmitting transducer adds up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers, receiving transducer is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer after touching body 180 degree reflections, and the time point that receiving circuit receives the 1st surface acoustic wave signal is t n1, the time point that receives the 2nd surface acoustic wave signal is t n2, the time point that receives m surface acoustic wave signal is t nm, because the relative position coordinates of each transmitting transducer is known, therefore the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y n1=V*{{t n1-[t 0+ (n-1) T] }-X n}/2,
The 2nd touches body: Y n2={ V*{t n2-[t 0+ (n-1) T] }-X n}/2,
…………
M touches body: Y nm={ V*{t nm-[t 0+ (n-1) T] }-X n}/2.
One group of receiving transducer array and a combination formed by single transmitting transducer and reflection strip array are set respectively on a wherein edge of described X-axis or Y-axis, by radiating circuit, drive transmitting transducer to continue the acoustic waves signal; Control all receiving transducers receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers independent receiving surface acoustic signals successively by receiving circuit.
When having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections i, because the relative position coordinates of each receiving transducer is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=[V* (t i-t 0)-Y i]/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer, one of them receiving transducer Y after touching body 180 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=[V* (t j1-t 0)-Y j]/2;
The 2nd touches body: X j2=[V* (t j2-t j1)+X j1]/2, or X j2=[V* (t j2-t 0)-Y j]/2;
…………
N touches body: X jn=[V* (t jn-t j1)+X j1]/2, or X jn=[V* (t jn-t 0)-Y j]/2.
One group of transmitting transducer arrays and one group of receiving transducer array are set respectively on a wherein edge of described X-axis or Y-axis, one group of transmitting transducer arrays and one group of receiving transducer array are set respectively on a wherein edge of described Y-axis or X-axis.
Receiving transducer array on described X-axis or Y-axis or the combination formed by single receiving transducer and reflection strip array are arranged on the transmitting terminal of surface acoustic wave signal.
Described any one transmitting transducer is when the acoustic waves signal, and all the other transmitting transducers are not worked.
Employing the invention has the advantages that:
One, the present invention at least arranges one group of transmitting transducer arrays formed by a plurality of transmitting transducers on X-axis or Y-axis, or one group of receiving transducer array formed by a plurality of receiving transducers at least is set, because the relative position coordinates of transmitting transducer or receiving transducer is known, therefore this structure not only can be told the true touch point of a plurality of touch bodies effectively, can also determine fast that a plurality of touch bodies are at X-axis or the coordinate on Y-axis, fundamentally eliminated terrible point, and above multiple spot actual touch response have been realized at 2, really accomplished touch area without the point of accumulation touch-responsive, with China Patent No. " 200920298621.7 ", for the prior art of representative, compare, simplicity of design of the present invention, the signal that surface acoustic wave touch screen receives is strong, touch stable performance, the circuit design matched does not need complicated filtering and Dolby circuit design, not only simplify the Material Cost of circuit, also reduced the design difficulty of P.e.c., the components and parts cost that the present invention simultaneously uses is low, and mature production technology is conducive to stable mass ground and produces surface acoustic wave touch screen.
Two, in the present invention, transmitting transducer arrays adopts the mode of acoustic waves signal simultaneously, is conducive to improve the intensity of surface acoustic wave signal, simplifies the design of radiating circuit switch and reduces many valves chip demand; Transmitting transducer arrays adopts successively the mode of acoustic waves signal separately, can effectively reduce the phase mutual interference between a plurality of touch bodies, improves touch signal stability, not only can reduce energy consumption, can also extend the serviceable life of transmitting transducer; The receiving transducer array adopts the mode of receiving surface acoustic signals simultaneously, can reduce the time of receiving surface acoustic signals, is conducive to improve touch-responsive speed; And receiving transducer adopts the mode of timesharing receiving surface acoustic signals, can reduce the interference of surface acoustic wave signal, be conducive to improve touch stability.
Three, in the present invention, the combined transmit surface acoustic wave signal that employing is formed by single transmitting transducer and reflection strip array, by receiving transducer array received surface acoustic wave signal, or employing transmitting transducer arrays acoustic waves signal, by the combination receiving surface acoustic signals formed by single receiving transducer and reflection strip array, when can effectively identifying multiple point touching, also reduce the transducer usage quantity, reduced production cost, particularly can locate fast from the coordinate of the touch body close to transmitting transducer, improved touch-responsive speed.
Four, in the present invention, in two perpendicular limits of touch-screen body, one group of transmitting transducer arrays and one group of receiving transducer array are set respectively on every limit, can improve the intensity of surface acoustic wave signal, and set up uniform acoustic wavefield in whole touch-screen surface, be conducive to improve the stability touched; Surface acoustic wave signal is stronger simultaneously, more be conducive to the lifting of touch function stability, and touching intensity (abbreviation touch feeling) is also lighter; Adopt this design can fundamentally eliminate terrible point, thereby improve the accuracy of touch point location determination; Two groups of receiving transducer arrays make the detection of surface acoustic wave signal sensitiveer, and testing result is more accurate.
Five, in the present invention, receiving transducer array on described X-axis or Y-axis or the combination formed by single receiving transducer and reflection strip array are arranged on the transmitting terminal of surface acoustic wave signal, this structure is conducive to reduce the travel path of reflection rear surface acoustic signals, reduces the decay of surface acoustic wave signal.
Six, in the present invention, described any one transmitting transducer is when the acoustic waves signal, and all the other transmitting transducers are not worked, can either reduce energy consumption, save the energy, can reduce again the working time of transmitting transducer, be conducive to extend the serviceable life of surface acoustic wave touch screen.
Seven, in the present invention, when having the body of touch to touch, receiving circuit converts the surface acoustic wave signal received to packet, just packet sorts with time of reception, send to CPU (central processing unit) MCU by cycle time, CPU (central processing unit) MCU plan as a whole to process the time of reception of each driving circuit launch time, surface acoustic wave signal etc., can accomplish that limit emission, edge joint are received, process on limit, can effectively shorten the stand-by period, improve the response speed of surface acoustic wave touch screen.
The accompanying drawing explanation
The fundamental diagram that Fig. 1 is the embodiment of the present invention 1.
The workflow diagram that Fig. 2 is the embodiment of the present invention 1.
The structural representation that Fig. 3 is the embodiment of the present invention 1.
The working time figure that Fig. 4 is emission shaft in the embodiment of the present invention 1.
The working time figure that Fig. 5 is receiving axes in the embodiment of the present invention 1.
The circuit block diagram that Fig. 6 is the embodiment of the present invention 1.
The fundamental diagram that Fig. 7 is the embodiment of the present invention 2.
The workflow diagram that Fig. 8 is the embodiment of the present invention 2.
The work schematic diagram that Fig. 9 is the embodiment of the present invention 2.
The working time figure that Figure 10 is emission shaft in the embodiment of the present invention 2.
The working time figure that Figure 11 is receiving axes in the embodiment of the present invention 2.
The fundamental diagram that Figure 12 is the embodiment of the present invention 3.
The workflow diagram that Figure 13 is the embodiment of the present invention 3.
The structural representation that Figure 14 is the embodiment of the present invention 3.
The working time figure that Figure 15 is emission shaft in the embodiment of the present invention 3.
The working time figure that Figure 16 is receiving axes in the embodiment of the present invention 3.
The structural representation that Figure 17 is the embodiment of the present invention 4.
The working time figure that Figure 18 is emission shaft in the embodiment of the present invention 4.
The working time figure that Figure 19 is receiving axes in the embodiment of the present invention 4.
The structural representation that Figure 20 is the embodiment of the present invention 5.
The structural representation that Figure 21 is the embodiment of the present invention 6.
The structural representation that Figure 22 is the embodiment of the present invention 7.
The structural representation that Figure 23 is the embodiment of the present invention 8.
Being labeled as in figure: 1, touch-screen body, 2, receiving transducer, 3, the reflection strip array, 4, transmitting transducer arrays, 5, the receiving transducer array, 6, transmitting transducer.
Embodiment
Embodiment 1
A kind of realization comprises the following steps in the method for surface acoustic wave touch screen multiple spot actual touch:
(1), one group of transmitting transducer arrays 4 formed by a plurality of transmitting transducers 6 at least is set on X-axis or Y-axis, or one group of receiving transducer array 5 formed by a plurality of receiving transducers 2 at least is set;
(2), drive transmitting transducer 6 acoustic waves signals by radiating circuit, by receiving circuit control receiving transducer 2 receiving surface acoustic signals;
(3), when having the body of touch to touch, surface acoustic wave signal arrives receiving transducer 2 after touching body, when surface acoustic wave signal intensity is greater than the threshold values of setting, receiving circuit is sent to CPU (central processing unit) MCU by this surface acoustic wave signal, and CPU (central processing unit) MCU determines the coordinate that touches body.
Further, when not touching the body touch, CPU (central processing unit) MCU does not do any processing.
In the present embodiment, when having the body of touch to touch, high density, high-octane surface acoustic wave signal is through touching body generation transmission, scattering, refraction and reflection, the energy wherein reflected is divided into 180 degree reflection Hou Yuan roads and turns back on transmitting transducer 6, arrive described vertical axle after arriving the axle vertical with emission shaft and other angle reflections after 90 degree reflections, but show through test, because from touching body, to arrive the vertical range of emission shaft or the axle vertical with emission shaft the shortest, so energy intensity energy on the described axle vertical with emission shaft of 90 degree reflections is maximum, the energy of energy intensity on described emission shaft of 180 degree reflections is also maximum simultaneously, when the surface acoustic wave signal intensity therefore received when receiving circuit is greater than the threshold values of setting, receiving circuit is sent to CPU (central processing unit) MCU by this surface acoustic wave signal, CPU (central processing unit) MCU determines the coordinate that touches body.
In the present embodiment, described transmitting transducer arrays 4 refers to by a plurality of transmitting transducers 6 and arranges by linear sequence on X-axis or Y-axis, and the transmitting transducer 6 in described transmitting transducer arrays 4 is arranged in parallel; Described receiving transducer array 5 refers to by a plurality of receiving transducers 2 and arranges by linear sequence on Y-axis or X-axis, and the receiving transducer 2 in described receiving transducer array 5 is arranged in parallel.
In the present embodiment, adopt receiving transducer array 5 to replace having now the unitized construction that in technology, single receiving transducer 2 and reflection strip array 3 form, adopt transmitting transducer arrays 4 to replace having now the unitized construction that in technology, single transmitting transducer 6 and reflection strip array 3 form, terrible point be can fundamentally eliminate, and above multiple spot actual touch response realized at 2.
In the present embodiment, one group of transmitting transducer arrays 4 preferably is set on described X-axis, one group of receiving transducer array 5 is set on described Y-axis, by radiating circuit, drive all transmitting transducers 6 acoustic waves signal simultaneously; Control all receiving transducers 2 receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers 2 independent receiving surface acoustic signals successively by receiving circuit; But be not limited to above-mentioned preferred arrangement, for example two groups of transmitting transducer arrays 4 can be set on X-axis, two groups of receiving transducer arrays 5 are set on Y-axis.
When having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections i, because the relative position coordinates of each receiving transducer 2 is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=V* (t i-t 0)-Y i;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer 2, one of them receiving transducer Y after touching body 90 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer 2 is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=V* (t j1-t 0)-Y j;
The 2nd touches body: X j2=V* (t j2-t j1)+X j1, or X j2=V* (t j2-t 0)-Y j;
…………
N touches body: X jn=V* (t jn-t j1)+X j1, or X jn=V* (t jn-t 0)-Y j; The velocity of propagation that wherein V is surface acoustic wave signal, t 0for the start time point of transmitting transducer 6 beginning acoustic waves signals, t ifor receiving transducer 2 receives the time point of surface acoustic wave signal, t first j1for Y jreceive the 1st time point that touches the surface acoustic wave signal of body, t j2for Y jreceive the 2nd time point that touches the surface acoustic wave signal of body, t jnfor Y jreceive n time point that touches the surface acoustic wave signal of body.
In the present embodiment, as shown in Figure 1, the time that T ' processes the received surface acoustic wave signal of receiving circuit for CPU (central processing unit) MCU, when the time T that is transmitting transducer 6 lasting acoustic waves signals is zero, stop the acoustic waves signal, CPU (central processing unit) MCU is in time T ' in process the received surface acoustic wave signal of receiving circuit.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, the key distinction is: one group of transmitting transducer arrays 4 is set on described X-axis, one group of receiving transducer array 5 is set on described Y-axis, from any one transmitting transducer 6, drive separately successively transmitting transducer 6 acoustic waves signals by radiating circuit, until all transmitting transducers 6 all driven mistake once, finish once circulation; Control all receiving transducers 2 receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers 2 independent receiving surface acoustic signals successively by receiving circuit; Above-mentioned set-up mode is preferably, but is not limited to above-mentioned preferred arrangement, for example one group of transmitting transducer arrays 4 can be set on X-axis, and two groups of receiving transducer arrays 5 are set on Y-axis.
Further, in described transmitting transducer arrays 4 transmitting transducer 6 add up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer 6 continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers 6, receiving transducer 2 is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having the body of touch to touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections n, because the relative position coordinates of each transmitting transducer 6 and receiving transducer 2 is known, therefore determine that the coordinate that touches body is (X n, Y n).
The principle of work of the present embodiment is: at first set transmitting transducer 6 in transmitting transducer arrays 4 successively by X 1, X 2, X 3x marrange, the receiving transducer 2 in receiving transducer array 5 is pressed Y successively 1, Y 2, Y 3y narrange, then by radiating circuit, drive separately transmitting transducer X 1continue the acoustic waves signal in setting-up time T, and start countdown, transmitting transducer X 1coordinate pre-recorded by CPU (central processing unit) MCU, when having when touching body and touching, detect receiving transducer Y 1whether the energy intensity of received surface acoustic wave signal is greater than the setting threshold values, if receiving transducer Y 1the energy intensity of received surface acoustic wave signal is greater than the setting threshold values, is judged to be true value 1, and meaning has the touch body, and records receiving transducer Y by CPU (central processing unit) MCU 1coordinate, if receiving transducer Y 1the energy intensity of received surface acoustic wave signal is less than the setting threshold values, is judged to be falsity 0, means the no touch body, and CPU (central processing unit) MCU does not do any record; Complete receiving transducer Y 1detection after, complete successively the detection of residue receiving transducer 2, until after completing the detection of all receiving transducers 2, the surface acoustic wave signal that receiving circuit receives the acoustic signals receiving unit becomes packet by the A/D circuit conversion, and add time mark to packet, then by cycle time, send to CPU (central processing unit) MCU to be processed packet, by CPU (central processing unit) MCU, determine that the coordinate that touches body is (X 1, Y 1), carry out and so forth, until all transmitting transducer 6 driven mistake all on X-axis, after completing once circulation, receiving circuit stops the receiving surface acoustic signals, waits for the instruction of circulation next time.
As shown in Figure 9, CPU (central processing unit) MCU drives transmitting transducer X by radiating circuit 1the time, surface acoustic wave is propagated along Y direction, and when running into touch body A, 90 degree reflections occur through touching body A in high density, high-octane surface acoustic wave signal, remove receiving transducer Y 8in addition, other receiving transducers 2 also in various degree received the energy that surface acoustic wave signal reflects, but only have receiving transducer Y 8the energy intensity of the surface acoustic wave signal received is greater than the setting threshold values, therefore, after Y-axis finishes scanning, can determine on Y-axis and only have a peak value Y 8, can be determined with so a true touch point and exist, be i.e. (X 1, Y 8).
After completing the surface acoustic wave signal detection of all receiving transducers 2, radiating circuit stops driving transmitting transducer X 1, and drive separately transmitting transducer X 2, surface acoustic wave signal is propagated along Y direction, and when running into touch body B and C, 90 degree reflections occur through touching body in surface acoustic wave signal, and the Energy maximum value after reflection is respectively by Y 5and Y 3receive, do not have the place of touch point not there will be reflection, naturally also be received with regard to noenergy, after Y-axis finishes scanning, two peak value Y are arranged 5and Y 3, can be determined with so two true touch points and exist, be i.e. (X 2, Y 5) and (X 2, Y 3).
Radiating circuit stops driving transmitting transducer X 2after, drive separately transmitting transducer X 3, surface acoustic wave signal is propagated along Y direction, but does not run into the touch body, and the receiving transducer array 5 of Y-axis does not all receive signal, therefore without peak value, X 3without true touch point.
Radiating circuit stops driving transmitting transducer X 3after, drive separately transmitting transducer X 4, surface acoustic wave signal is propagated along Y direction, and when running into touch body D, E and F, the Energy maximum value of 90 degree reflections is respectively by Y 5, Y 7and Y 9receive, do not have the place of touch point not there will be reflection, although touch the 90 degree directions of body D, there is one to touch body B existence, but according to the surface acoustic wave transmission principle, 90% energy of surface acoustic wave signal is all transmission, therefore the existence of B can not affect the transmission of the 90 degree reflected energies of D, due to large several times of the amplitude of the reflected energy of other angles of Amplitude Ratio of 90 degree reflected energies, does not therefore affect the amplitude difference of other angle reflection energy yet.So, after Y-axis finishes scanning, three peak value Y are arranged 5, Y 7and Y 9, can be determined with so three true touch points and exist, be i.e. (X 4, Y 5), (X 4, Y 7) and (X 4, Y 9).
Radiating circuit stops driving transmitting transducer X 4after, drive separately transmitting transducer X 5, surface acoustic wave signal is propagated along Y direction, but does not run into the touch body, and the receiving transducer array 5 of Y-axis does not all receive signal, therefore without peak value, X 5without true touch point.
Radiating circuit stops driving transmitting transducer X 5voltage after, drive separately transmitting transducer X 6, surface acoustic wave signal is propagated along Y direction, and when running into touch body G, the Energy maximum value of 90 degree reflections is by Y 3receive, although touch the 90 degree directions of body G, have a touch to propose the C existence, do not affect the judgement of peak value, after Y-axis finishes scanning, a peak value Y is arranged 3, therefore can be determined with a true touch point and exist, be i.e. (X 6, Y 3).
Embodiment 3
The present embodiment is substantially the same manner as Example 2, the key distinction is: one group of transmitting transducer arrays 4 is set on described X-axis, a combination formed by single receiving transducer 2 and reflection strip array 3 is set on described Y-axis, from any one transmitting transducer 6, drive separately successively transmitting transducer 6 acoustic waves signals by radiating circuit, until all transmitting transducers 6 all driven mistake once, finish once circulation; Control receiving transducer 2 receiving surface acoustic signals by receiving circuit; Above-mentioned set-up mode is preferred, but be not limited to above-mentioned preferred arrangement, for example can on two limits of X-axis, two groups of transmitting transducer arrays 4 be set respectively, two combinations that formed by single receiving transducer 2 and reflection strip array 3 are set respectively on two limits of Y-axis.
Further, in described transmitting transducer arrays 4 transmitting transducer 6 add up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer 6 continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers 6, receiving transducer 2 is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer 2 after touching body 90 degree reflections, and the time point that receiving circuit receives the 1st surface acoustic wave signal is t n1, the time point that receives the 2nd surface acoustic wave signal is t n2, the time point that receives m surface acoustic wave signal is t nm, because the relative position coordinates of each transmitting transducer 6 is known, therefore the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y n1={ V*{t n1-[t 0+ (n-1) T] }-X n}/2,
The 2nd touches body: Y n2={ V*{t n2-[t 0+ (n-1) T] }-X n}/2,
…………
M touches body: Y nm={ V*{t nm-[t 0+ (n-1) T] }-X n}/2.
The principle of work of the principle of work of the present embodiment and embodiment 2 is basic identical, and the key distinction is: to any transmitting transducer X iwhile being driven, transmitting transducer X ithe surface acoustic wave signal of emission is parallel to Y direction, transmitting transducer X ion the touch body be transmitted to reflection strip array 3 after making surface acoustic wave signal produce 90 degree reflections, 90 degree deflection rear surface acoustic signals occur after reflection strip array 3 conduct to receiving transducer 2, then unifiedly by receiving transducer 2, carry out the acoustic-electric conversion.Obviously, all surface acoustic signals all lives through one section by X after 90 degree reflections ivertical to the distance between reflection strip array 3, difference is after reflection strip array 3 secondaries turn to only, surface acoustic wave signal near receiving transducer 2 first arrives receiving transducer 2, away from arriving receiving transducer 2 after the surface acoustic wave signal of receiving transducer 2, the present embodiment has been cancelled receiving transducer array 5, reduce the production cost of surface acoustic wave touch screen, be conducive to mass production.
Embodiment 4
The present embodiment is substantially the same manner as Example 1, the key distinction is: a combination formed by single receiving transducer 2 and reflection strip array 3 is set on described X-axis, one group of receiving transducer array 5 is set on described Y-axis, by radiating circuit, drives transmitting transducer 6 to continue the acoustic waves signal; Control all receiving transducers 2 receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers 2 independent receiving surface acoustic signals successively by receiving circuit; Above-mentioned set-up mode is preferred, but be not limited to above-mentioned preferred arrangement, for example can on two limits of X-axis, arrange respectively two by single receiving transducer 2 and the combination that reflection strip array 3 forms, can on two limits of Y-axis, two groups of receiving transducer arrays 5 be set respectively.
Further, when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections i, because the relative position coordinates of each receiving transducer 2 is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=[V* (t i-t 0)-Y i]/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer 2, one of them receiving transducer Y after touching body 90 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer 2 is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=[V* (t j1-t 0)-Y j]/2;
The 2nd touches body: X j2=[V* (t j2-t j1)]/2+X j1, or X j2=[V* (t j2-t 0)-Y j]/2;
…………
N touches body: X jn=[V* (t jn-t j1)]/2+X j1, or X jn=[V* (t jn-t 0)-Y j]/2.
Embodiment 5
The present embodiment is substantially the same manner as Example 1, the key distinction is: one group of transmitting transducer arrays 4 and one group of receiving transducer array 5 are set respectively on a wherein edge of described X-axis or Y-axis, by radiating circuit, drive all transmitting transducers 6 acoustic waves signal simultaneously; Control all receiving transducers 2 receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers 2 independent receiving surface acoustic signals successively by receiving circuit.
Further, preferred forms is that receiving transducer array 5 is parallel with transmitting transducer arrays 4, and receiving transducer array 5 is arranged on the transmitting terminal of surface acoustic wave signal.
When having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections i, because the relative position coordinates of each receiving transducer 2 is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=V* (t i-t 0)/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer 2, one of them receiving transducer Y after touching body 180 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer 2 is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=V* (t j1-t 0)/2;
The 2nd touches body: X j2=V* (t j2-t j1)/2+X j1, or X j2=V* (t j2-t 0)/2;
…………
N touches body: X jn=[V* (t jn-t j1)]/2+X j1, or X jn=V* (t jn-t 0)/2.
Embodiment 6
The present embodiment is substantially the same manner as Example 5, the key distinction is: one group of transmitting transducer arrays 4 and one group of receiving transducer array 5 are set respectively on a wherein edge of described X-axis or Y-axis, from any one transmitting transducer 6, drive separately successively transmitting transducer 6 acoustic waves signals by radiating circuit, until all transmitting transducers 6 all driven mistake once, finish once circulation; Control all receiving transducers 2 receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers 2 independent receiving surface acoustic signals successively by receiving circuit.
In described transmitting transducer arrays 4, transmitting transducer 6 adds up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer 6 continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers 6, receiving transducer 2 is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections n, because the relative position coordinates of each transmitting transducer 6 and receiving transducer 2 is known, therefore determine that this coordinate that touches body is (X n, Y n); When having a plurality of touch bodies to touch, the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y j1=V* (t j1-t 0)/2;
The 2nd touches body: Y j2=V* (t j2-t j1)/2+Y j1, or Y j2=V* (t j2-t 0)/2;
…………
N touches body: Y jn=[V* (t jn-t j1)]/2+Y j1, or Y jn=V* (t jn-t 0)/2.
Embodiment 7
The present embodiment is substantially the same manner as Example 6, the key distinction is: one group of transmitting transducer arrays 4 and a combination formed by single receiving transducer 2 and reflection strip array 3 are set respectively on a wherein edge of described X-axis or Y-axis, from any one transmitting transducer 6, drive separately successively transmitting transducer 6 acoustic waves signals by radiating circuit, until all transmitting transducers 6 all driven mistake once, finish once circulation; Control receiving transducer 2 receiving surface acoustic signals by receiving circuit.
Further, preferred forms is that the combination formed by single receiving transducer 2 and reflection strip array 3 is arranged on the transmitting terminal of surface acoustic wave signal.
In described transmitting transducer arrays 4, transmitting transducer 6 adds up to n, first transmitting transducer X 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer 6 continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers 6, receiving transducer 2 is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer 2 after touching body 180 degree reflections, and the time point that receiving circuit receives the 1st surface acoustic wave signal is t n1, the time point that receives the 2nd surface acoustic wave signal is t n2, the time point that receives m surface acoustic wave signal is t nm, because the relative position coordinates of each transmitting transducer 6 is known, therefore the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y n1=V*{{t n1-[t 0+ (n-1) T] }-X n}/2,
The 2nd touches body: Y n2={ V*{t n2-[t 0+ (n-1) T] }-X n}/2,
…………
M touches body: Y nm={ V*{t nm-[t 0+ (n-1) T] }-X n}/2.
Embodiment 8
The present embodiment is substantially the same manner as Example 5, the key distinction is: one group of receiving transducer array 5 and a combination formed by single transmitting transducer 6 and reflection strip array 3 are set respectively on a wherein edge of described X-axis or Y-axis, by radiating circuit, drive transmitting transducer 6 to continue the acoustic waves signal; Control all receiving transducers 2 receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers 2 independent receiving surface acoustic signals successively by receiving circuit.
Further, preferred forms is that receiving transducer array 5 is arranged on the transmit direction of surface acoustic wave signal.
When having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections i, because the relative position coordinates of each receiving transducer 2 is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=[V* (t i-t 0)-Y i]/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer 2, one of them receiving transducer Y after touching body 180 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer 2 is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=[V* (t j1-t 0)-Y j]/2;
The 2nd touches body: X j2=[V* (t j2-t j1)+X j1]/2, or X j2=[V* (t j2-t 0)-Y j]/2;
…………
N touches body: X jn=[V* (t jn-t j1)+X j1]/2, or X jn=[V* (t jn-t 0)-Y j]/2.
Embodiment 9
The present embodiment is identical with any embodiment in embodiment 5-8, the key distinction is: described transmitting transducer arrays 4, receiving transducer array 5, single receiving transducer 2 and combination or single transmitting transducer 6 and the combination that reflection strip array 3 forms that reflection strip array 3 forms, can mutually combine and be arranged on X-axis and Y-axis simultaneously.
Further,
In the present invention, combination, transmitting transducer arrays 4 or receiving transducer array 5 that the combination that in above-mentioned any embodiment, involved single transmitting transducer 6 and reflection strip array 3 form, single receiving transducer 2 and reflection strip array 3 form, preferably be arranged on the back side of touch-screen body 1, make touch face become a complete pure-surface.
In the present invention, describedly from any one transmitting transducer 6, start to drive, until all transmitting transducers 6 any one transmitting transducer 6 that all driven mistake once refers to drive is reference, by from lower to upper or basipetal direction drive successively remaining transmitting transducer 6, wherein, any one transmitting transducer 6 is when the acoustic waves signal, and all the other transmitting transducers 6 are not worked.

Claims (19)

1. a realization, in the method for surface acoustic wave touch screen multiple spot actual touch, is characterized in that, comprises the following steps:
(1), one group of transmitting transducer arrays (4) formed by a plurality of transmitting transducers (6) at least is set on X-axis or Y-axis, or one group of receiving transducer array (5) formed by a plurality of receiving transducers (2) at least is set;
(2), drive transmitting transducer (6) acoustic waves signal by radiating circuit, by receiving circuit control receiving transducer (2) receiving surface acoustic signals;
(3), when having the body of touch to touch, surface acoustic wave signal arrives receiving transducer (2) after touching the body reflection, when surface acoustic wave signal intensity is greater than the threshold values of setting, receiving circuit is sent to CPU (central processing unit) MCU by this surface acoustic wave signal, and CPU (central processing unit) MCU determines the coordinate that touches body.
2. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: one group of transmitting transducer arrays (4) at least is set on described X-axis, one group of receiving transducer array (5) at least is set on described Y-axis, by radiating circuit, drives all transmitting transducers (6) acoustic waves signal simultaneously; Control all receiving transducers (2) receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers (2) independent receiving surface acoustic signals successively by receiving circuit.
3. a kind of realization the as claimed in claim 2 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections i, because the relative position coordinates of each receiving transducer (2) is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=V* (t i-t 0)-Y i;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer (2), one of them receiving transducer Y after touching body 90 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer (2) is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=V* (t j1-t 0)-Y j;
The 2nd touches body: X j2=V* (t j2-t j1)+X j1, or X j2=V* (t j2-t 0)-Y j;
…………
N touches body: X jn=V* (t jn-t j1)+X j1, or X jn=V* (t jn-t 0)-Y j; The velocity of propagation that wherein V is surface acoustic wave signal, t 0for transmitting transducer starts the start time point of acoustic waves signal, t ifor receiving transducer receives the time point of surface acoustic wave signal, t first j1for Y jreceive the 1st time point that touches the surface acoustic wave signal of body, t j2for Y jreceive the 2nd time point that touches the surface acoustic wave signal of body, t jnfor Y jreceive n time point that touches the surface acoustic wave signal of body.
4. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: one group of transmitting transducer arrays (4) at least is set on described X-axis, one group of receiving transducer array (5) at least is set on described Y-axis, from any one transmitting transducer (6), drive separately successively transmitting transducer (6) acoustic waves signal by radiating circuit, until all transmitting transducers (6) all driven mistake once, finish once circulation; Control all receiving transducers (2) receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers (2) independent receiving surface acoustic signals successively by receiving circuit.
5. a kind of realization the as claimed in claim 4 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: transmitting transducer (6) adds up to n, first transmitting transducer X in described transmitting transducer arrays (4) 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer (6) continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers (6), receiving transducer (2) is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having the body of touch to touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections n, because the relative position coordinates of each transmitting transducer (6) and receiving transducer (2) is known, therefore determine that the coordinate that touches body is (X n, Y n).
6. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: one group of transmitting transducer arrays (4) at least is set on described X-axis, a combination formed by single receiving transducer (2) and reflection strip array (3) at least is set on described Y-axis, from any one transmitting transducer (6), drive separately successively transmitting transducer (6) acoustic waves signal by radiating circuit, until all transmitting transducers (6) all driven mistake once, finish once circulation; Control receiving transducer (2) receiving surface acoustic signals by receiving circuit.
7. a kind of realization the as claimed in claim 6 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: transmitting transducer (6) adds up to n, first transmitting transducer X in described transmitting transducer arrays (4) 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer (6) continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers (6), receiving transducer (2) is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer (2) after touching body 90 degree reflections, and the time point that receiving circuit receives the 1st surface acoustic wave signal is t n1, the time point that receives (2) individual surface acoustic wave signal is t n2, the time point that receives m surface acoustic wave signal is t nm, because the relative position coordinates of each transmitting transducer (6) is known, therefore the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y n1={ V*{t n1-[t 0+ (n-1) T] }-X n}/2,
The 2nd touches body: Y n2={ V*{t n2-[t 0+ (n-1) T] }-X n}/2,
…………
M touches body: Y nm={ V*{t nm-[t 0+ (n-1) T] }-X n}/2.
8. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: a combination formed by single transmitting transducer (6) and reflection strip array (3) at least is set on described X-axis, one group of receiving transducer array (5) at least is set on described Y-axis, by radiating circuit, drives transmitting transducer (6) to continue the acoustic waves signal; Control all receiving transducers (2) receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers (2) independent receiving surface acoustic signals successively by receiving circuit.
9. a kind of realization the as claimed in claim 8 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 90 degree reflections i, because the relative position coordinates of each receiving transducer (2) is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=[V* (t i-t 0)-Y i]/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer (2), one of them receiving transducer Y after touching body 90 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer (2) is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=[V* (t j1-t 0)-Y j]/2;
The 2nd touches body: X j2=[V* (t j2-t j1)]/2+X j1, or X j2=[V* (t j2-t 0)-Y j]/2;
…………
N touches body: X jn=[V* (t jn-t j1)]/2+X j1, or X jn=[V* (t jn-t 0)-Y j]/2.
10. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: one group of transmitting transducer arrays (4) and one group of receiving transducer array (5) are set respectively on a wherein edge of described X-axis or Y-axis, by radiating circuit, drive all transmitting transducers (6) acoustic waves signal simultaneously; Control all receiving transducers (2) receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers (2) independent receiving surface acoustic signals successively by receiving circuit.
11. a kind of realization the as claimed in claim 10 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections i, because the relative position coordinates of each receiving transducer (2) is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=V* (t i-t 0)/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer (2), one of them receiving transducer Y after touching body 180 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer (2) is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=V* (t j1-t 0)/2;
The 2nd touches body: X j2=V* (t j2-t j1)/2+X j1, or X j2=V* (t j2-t 0)/2;
…………
N touches body: X jn=[V* (t jn-t j1)]/2+X j1, or X jn=V* (t jn-t 0)/2.
12. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: one group of transmitting transducer arrays (4) and one group of receiving transducer array (5) are set respectively on a wherein edge of described X-axis or Y-axis, from any one transmitting transducer (6), drive separately successively transmitting transducer (6) acoustic waves signal by radiating circuit, until all transmitting transducers (6) all driven mistake once, finish once circulation; Control all receiving transducers (2) receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers (2) independent receiving surface acoustic signals successively by receiving circuit.
13. a kind of realization the as claimed in claim 12 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: transmitting transducer (6) adds up to n, first transmitting transducer X in described transmitting transducer arrays (4) 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer (6) continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers (6), receiving transducer (2) is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections n, because the relative position coordinates of each transmitting transducer (6) and receiving transducer (2) is known, therefore determine that this coordinate that touches body is (X n, Y n); When having a plurality of touch bodies to touch, the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y j1=V* (t j1-t 0)/2;
The 2nd touches body: Y j2=V* (t j2-t j1)/2+Y j1, or Y j2=V* (t j2-t 0)/2;
…………
N touches body: Y jn=[V* (t jn-t j1)]/2+Y j1, or Y jn=V* (t jn-t 0)/2.
14. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: one group of transmitting transducer arrays (4) and a combination formed by single receiving transducer (2) and reflection strip array (3) are set respectively on a wherein edge of described X-axis or Y-axis, from any one transmitting transducer (6), drive separately successively transmitting transducer (6) acoustic waves signal by radiating circuit, until all transmitting transducers (6) all driven mistake once, finish once circulation; Control receiving transducer (2) receiving surface acoustic signals by receiving circuit.
15. a kind of realization the as claimed in claim 14 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: transmitting transducer (6) adds up to n, first transmitting transducer X in described transmitting transducer arrays (4) 1the start time point that continues the acoustic waves signal is t 0, the time that each transmitting transducer (6) continues the acoustic waves signal is T, until all once once circulations of end afterwards of driven mistake of all transmitting transducers (6), receiving transducer (2) is from start time point t 0start the receiving surface acoustic signals, stop the receiving surface acoustic signals after lasting n*T;
At (n-1) * T～n*T in the period, n transmitting transducer X ncontinue the acoustic waves signal, when having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer (2) after touching body 180 degree reflections, and the time point that receiving circuit receives the 1st surface acoustic wave signal is t n1, the time point that receives the 2nd surface acoustic wave signal is t n2, the time point that receives m surface acoustic wave signal is t nm, because the relative position coordinates of each transmitting transducer (6) is known, therefore the coordinate of a plurality of touch bodies on X-axis is X n, the coordinate on Y-axis is respectively:
The 1st touches body: Y n1=V*{{t n1-[t 0+ (n-1) T] }-X n}/2,
The 2nd touches body: Y n2={ V*{t n2-[t 0+ (n-1) T] }-X n}/2,
…………
M touches body: Y nm={ V*{t nm-[t 0+ (n-1) T] }-X n}/2.
16. a kind of method realized in surface acoustic wave touch screen multiple spot actual touch as claimed in claim 1, it is characterized in that: one group of receiving transducer array (5) and a combination formed by single transmitting transducer (6) and reflection strip array (3) are set respectively on a wherein edge of described X-axis or Y-axis, by radiating circuit, drive transmitting transducer (6) to continue the acoustic waves signal; Control all receiving transducers (2) receiving surface acoustic signals simultaneously by receiving circuit, or control all receiving transducers (2) independent receiving surface acoustic signals successively by receiving circuit.
17. a kind of realization the as claimed in claim 16 is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: when having one to touch the body touch, surface acoustic wave signal arrives receiving transducer Y after touching body 180 degree reflections i, because the relative position coordinates of each receiving transducer (2) is known, so the coordinate of this touch body on Y-axis is Y i, the coordinate on X-axis is: X i=[V* (t i-t 0)-Y i]/2;
When having a plurality of touch bodies to touch, surface acoustic wave signal arrives receiving transducer (2), one of them receiving transducer Y after touching body 180 degree reflections jreceive a plurality of surface acoustic wave signals, because the relative position coordinates of each receiving transducer (2) is known, therefore the coordinate of a plurality of touch bodies on Y-axis is Y j, the coordinate on X-axis is respectively:
The 1st touches body: X j1=[V* (t j1-t 0)-Y j]/2;
The 2nd touches body: X j2=[V* (t j2-t j1)+X j1]/2, or X j2=[V* (t j2-t 0)-Y j]/2;
…………
N touches body: X jn=[V* (t jn-t j1)+X j1]/2, or X jn=[V* (t jn-t 0)-Y j]/2.
18. as claim 10,12,13 or 16 described a kind of realizations is characterized in that in the method for surface acoustic wave touch screen multiple spot actual touch: the receiving transducer array (5) on described X-axis or Y-axis or the combination formed by single receiving transducer (2) and reflection strip array (3) are arranged on the transmitting terminal of surface acoustic wave signal.
19. as claim 4,6,12 or 14 a kind of described methods that realize in surface acoustic wave touch screen multiple spot actual touch, it is characterized in that: described any one transmitting transducer (6) is when the acoustic waves signal, and all the other transmitting transducers (6) are not worked.
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