CN101231566B - Contact sensing device and method thereof - Google Patents
Contact sensing device and method thereof Download PDFInfo
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- CN101231566B CN101231566B CN2008100743085A CN200810074308A CN101231566B CN 101231566 B CN101231566 B CN 101231566B CN 2008100743085 A CN2008100743085 A CN 2008100743085A CN 200810074308 A CN200810074308 A CN 200810074308A CN 101231566 B CN101231566 B CN 101231566B
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Abstract
A method and apparatus using bending wave vibration to calculate information relating to a contact on a contact sensitive device (10). The method comprises the steps of providing a panel-form member capable of supporting bending wave vibration; generating bending wave vibration in the member from one location on the member to probe for information relating to a contact; contacting the member at a discrete location to produce a change in the generated bending wave vibration in the member; measuring the changed bending wave vibration in the member at two locations on the member to determine a measured bending wave signal; and processing the measured bending wave signal to calculate information relating to the contact including applying a correction to convert the measured bending wave signal to a propagation signal from a non-dispersive wave source.
Description
The application is that the application number submitted on Dec 18th, 2000 is the dividing an application of application for a patent for invention " contact sensitive device " of 00817654.X.
Technical field
The present invention relates generally to contact sensitive device and method, and be specifically related to a kind of active contact sensitive device, a kind of method of determining the information relevant and a kind ofly be used for to keep bending wave vibration and the method for the parts of the panel-form of formation acoustic radiator when being energized with the contact on the active contact sensitive device.
Background technology
Virtual display unit comprises the sensing contact screen of certain pattern usually.After the portable multimedia device of future generation of for example palmtop computer occurred, it became more general.Utilizing ripple is surface acoustic wave (SAW) with the technology that detects the nearest foundation that contacts.It will produce high frequency waves on the glass screen surface, and will utilize decay behind the finger touch with the senses touch position.This method is " time that slips by (time-of-flight) ", wherein utilizes the disturbance time that arrives one or more sensors with the detection position.When medium are worked in the non-dispersive mode, that is velocity of wave is not when having significant the variation in the frequency range of being paid close attention to, and this method is feasible.
Summary of the invention
According to the present invention, a kind of method of determining the information relevant with the contact on the active contact sensitive device is provided, comprise following steps: provide the parts that can keep the panel-form of bending wave vibration; A position from these parts produces the bending wave vibration these parts, to detect and to contact relevant information; Contact this parts in discrete position, so that be created on the variation of the bending wave vibration that is produced in these parts; On two positions of these parts, measure the bending wave vibration of the variation in these parts, to determine measured bending wave signal; And handle measured bending wave signal, to calculate the information relevant with contact, this processing comprises: apply correction, measured bending wave signal is converted to from the transmitting signal in non-dispersive ripple source.
According to the present invention, a kind of active contact sensitive device is provided, comprising: can keep bending wave vibration and when being energized, form the parts of acoustic radiator; Be couple to one or more drivers of these parts, be used for encouraging the bending wave vibration of these parts, detecting the information relevant, and make this parts produce voice output with the contact that on the surface of these parts, produces; Be couple at least one sensor of these parts, be used for measuring the bending wave vibration of these parts; Operationally be couple to the processor of described at least one sensor, be used for according to producing by contact and by the variation at the bending wave vibration of these parts of described at least one sensor measurement, handle and contact relevant information, and apply correction, measured bending wave signal is converted to from the transmitting signal in non-dispersive ripple source.
According to the present invention, a kind of active contact sensitive device is provided, comprising: the parts that can keep bending wave vibration; Be couple to the selector of these parts, be used for encouraging the bending wave vibration of these parts, to detect and to contact relevant information; Be couple at least one sensor of these parts, be used for measuring the bending wave vibration of these parts; Operationally be couple to the processor of described at least one sensor, be used for according to producing by contact and by the variation at the bending wave vibration of these parts of described at least one sensor measurement, handle the information relevant with the contact that on the surface of these parts, produces, and be used to apply correction, measured bending wave signal is converted to from the transmitting signal in non-dispersive ripple source.
According to the present invention, a kind of method of determining the information relevant with the contact on the contact sensitive device is provided, comprise following steps: provide the parts that can keep bending wave vibration; In these parts, produce bending wave vibration, to detect and to contact relevant information; Contact this parts in discrete position, so that be created on the variation of the bending wave vibration that is produced in these parts; Measure the bending wave vibration of the variation in these parts, to determine measured bending wave signal; And handle measured bending wave signal, to calculate the information relevant with contact, this processing comprises: apply correction, measured bending wave signal is converted to from the transmitting signal in non-dispersive ripple source.
According to the present invention, a kind of method that is used for keeping bending wave vibration and forms the parts of acoustic radiator when being energized is provided, this method comprises: use the selector that is couple to these parts to encourage bending wave vibration; In being couple at least one sensor of these parts, measure the bending wave vibration in relevant with the contact that on the surface of these parts, produces, these parts; And handle the information relevant with contact by described at least one sensor measurement, and and apply correction, measured bending wave signal being converted to from the transmitting signal in non-dispersive ripple source, thus identification and contact relevant information.
According to the present invention, a kind of relevant described method of information that contacts on a contact sensitive device of determining is provided, the step that comprises is:
One parts that can keep flexural wave are provided,
Contact this parts in discrete position, with the variation of generation bending wave vibration in parts,
A measurement mechanism that is attached to these parts is provided at least, measuring the bending wave vibration in parts, change thereby to determine measured bending wave signal, and
Handle measured bending wave signal to calculate the information of relevant contact.
Contact can be the form of input pen (stylus) or finger contact.This input pen can be the shape of hand held pen.
The information of being calculated can be position contacting or can be out of Memory, for example Jie Chu pressure or size.Relevant contact information can calculate in central processing unit.
Available at least one sensor measurement flexural wave propagation that is installed in edge-of-part or is separated by with edge-of-part.The form of sensor can be a transducer-translating device (sensing transducer), and it can convert bending wave vibration to analog input signal.Sensor more than one can be arranged.
Bending wave vibration is meaning for example excitation of contact, and it transfers to parts with some in-plane displancements.Many crooked materials are arranged, and some has the pure bending of square root dispersion relation completely, and some is the mixing of pure bending and the bending of cutting property.Dispersion relation has been described the plane speed of ripple and the correlativity of wave frequency.The material behavior of parts and excitation frequency have been determined the relative amplitude of vibration.
Flexural wave is dispersed, that is crooked wave propagation velocity is relevant with frequency.Because of the disturbance mark disseminates in time gradually, method is not very appropriate so characteristic makes any " time that slips by ".Therefore, this method also comprises and will be proofreaied and correct from the measured bending wave signal in non-dispersive ripple source, and it will be will convert the step of transmitting signal to.In case added correction, the technical method that is used for radar and sonar field can be used to detect position contacting.
A great advantage utilizing flexural wave to propagate is that flexural wave is bulk wave (bulk wave), and it comprises moving of entire portion, but not just surperficial.On the contrary, what most of other sensing contact technology relied on is surface effect, thereby is vulnerable to the influence of the damage on surface.Therefore, it should be firmer and more insensitive etc. to the scuffing on surface utilizing the contact sensitive device of flexural wave.
Utilize to proofread and correct and can be the first step of handling bending wave signal.The correction that is utilized is preferably based on the dispersion relation of the component materials of keeping flexural wave.This dispersion relation combines modelling by the actual parameter that flexural wave equation and component materials is known.In addition, an available laser vibrometer is measured dispersion relation, so that in parts many known frequencies are produced the image of vibration mode (pattern), thereby is provided at the dispersion relation in the frequency range of being paid close attention to.
By moving in the parts taken a sample sustainably to carry out the measurement that flexural wave is propagated.Measured bending wave signal is compared with a reference signal (for example established signal before contacting), when contact, can discern.Amplitude or other characteristic that can compare signal.In case form contact, can write down measured bending wave signal, handled then.
Parts can be the form of flat board (plate) or panel (panel).These parts can be transparent or select nontransparently, for example have the figure of printing.These parts can have homogeneous thickness.In addition, parts can have more complicated shape, for example curved surface and/or variable thickness.If flexural wave may march to one of sensor (no matter being many complicated paths) from contact position, by the contact position of the bending wave signal received with the decipher sensor of the adaptive algorithm of class neural network for example is provided, this method is applicable to the parts of complicated shape.Several sensors may be arranged.
This method can relate to pure passive type (passive) sensing.In other words, the variation that contacts bending wave vibration in the caused parts can be the excitation to bending wave vibration in the parts.In other words, the passive type sensor be there is no other bending wave vibration source.By be recorded in time that each sensor pulse arrives, these times of comparison with determine each sensor apart from the relative distance of impulse source and with relative distance intersect with position contacting, can calculate position contacting.Can be produced bending wave vibration and measured bending wave signal by what contact by percussion or frictional movement.Minimum have three sensors.
Increasing the number of sensors be used to detect contact or contact position provides extra information, and thereby can provide more accurately and detect.Additionally or additionally, can analyze the bending wave signal of receiving at each sensor, so that not only measure direct signal (that is pulse arrives the signal of converter at first) and also measured reflection from edge-of-part in the long time period.This method is similar to the scheme that adds direct reflection to each existing sensors.Utilize this mode, the extraneous information of gained can be used for accuracy that provides higher or the number that reduces sensor.
After calculating position contacting, can further handle the out of Memory of measured bending wave signal to determine that contact is relevant.Input pen will produce the continuous signal that the position, pressure and the speed that are subjected to input pen on the parts influences moving on the parts.Can be used for deriving other Useful Information in various application from data continuous time that this continuous signal is derived.
A kind of application can be signature and recognizes, and it is the subclass of the more general work of figure recognition.For example these data from complexity application of drawing figure, its advantage mainly come the extra independent information that occurs in the data comfortable continuous time.Thereby this method also can comprise the step that realizes being used to handling the class neural network of data continuous time.Can train such neural network by one group of example, one group of signature for example writing by a particular artifact or according to the set that knowledge produced of the caused typical change of person writing's process.
The fundamental characteristics of class neural network be available independent information the more, the accuracy of the conclusion that draws is higher.Because be speed and the pressure correlation with input pen on parts surface, many information available are to have nothing to do with positional information fully in continuous time data.Therefore extra information will increase the possibility that signature is accurately recognized.This method also can comprise the training to the second class neural network of the example of the time response of signature.That utilization is produced by the user or from the more many cases training of the knowledge of the variation of pressure and speed expection, can realize other improvement.
In addition, continuous time, data can be used for the detection of hand-written recognition, " double-click " or the detection of contact strength, and for example how strong click have.Utilize the image of pulse shape in data continuous time, can realize " double-click " and both detections of some hit intensity.Can utilize the position sample speed slower than other more conventional techniques.
Comparatively speaking, the detection to contacts such as pen, fingers is to carry out under predetermined sampling rate traditionally, and the information of relevant contact position is to set up from the set of point.There is no continuous temporal information, thereby can't carry out above-mentioned many application, perhaps under low satisfaction, carry out only.
Because all types of characteristic frequency differences that input pen produced, so the measurement of the frequency content of measured bending wave signal can be used for determining contact type.For example hard input pen will produce higher frequency than soft finger.Thereby can set up the contact sensitive device that utilizes the pen-based input device that hand takes, also unlikely if operator's hand touches this contact sensitive device with its triggering.
The difference that means accessible absolute spatial resolution by the dissimilar frequency differences that input pen produced; Big resolution heals frequency transitions high and becomes to heal.Yet the difference of resolution is consistent with the requirement of contact in the discussion usually.For example, be usually less than the spatial resolution of sharp end input pen expection with the required spatial resolution of finger input.
The frequency that contact is produced is quite low, that is is generally audio frequency but not frequency of ultrasonic.Therefore, parts preferably can be kept the bending wave vibration of audiorange.Thereby the parts similar to the acoustic radiator that is used as loudspeaker are also available as contact sensitive device.
Contact sensitive device also can comprise a selector that is installed on the parts, with the bending wave vibration in the production part, thereby detects the relevant information that contacts.Therefore these parts can be acoustic radiator, and can be used for sonorific output at the bending wave vibration of parts.Though have can influence other pattern noise signal of passive type sensing, but can to regard be noise signal in this vibration.When the external noise signal, this method also can comprise with noise signal and the technology that contacts the Signal Spacing that is produced, for example:
1) predicts the predictive filtering of the response of noise signal at short notice.Be likely by contacting with the difference of predicted value but not selector is produced.
2) continuous recording by utilizing the voice signal that produces and selector are to the transport function of sensor, with the noise signal modelling.This makes can be than predictive filtering predict noise signal more exactly.
3), utilize a plurality of sensors to determine the position of selector to be used for the same way as of contact (for example, bracketing method) position, location.This information helps flexural wave that selector is produced and contacts the crooked phase of wave that is produced and separate.
In addition, noise signal can be used as active (active) detection that contacts in the parts.Therefore this method also can be included in and produce flexural wave in the parts, and to form active detection, in other words, the ripple that produces with contact is irrelevant and relevant with the response to the ripple that contacts caused mechanical constraint parameter (constraint) that has existed in parts.
Flexural wave in parts can be by producing from the pumping signal that is installed in the converter on the parts.This converter can have difunctional, that is as selector and sensor.In addition, a selector and at least one sensor can be installed on parts.
The effect of contact can be reflectivity, absorbefacient, the perhaps combination of the two.For reflection, selector has produced flexural wave, its reflection contact and by same converter or independently sensor detected.Can utilize the signal of dispersion of materials relation information processing time or frequency response then.Contact the distance of being advanced to produce to this sensor from selector or source process.
Single-measurement is enough to distinguish two obviously apart from the contact position that separates.Yet, may need more information to determine contact position more accurately.Can be with the reflection of a plurality of sensor reaching this purpose, and can send pumping signal from this selector or the separate sources of using from some or all sensor.In any mode, each sensor has been done independent measurement to contact position, by providing contact position more accurately gradually in conjunction with increasing the converter number.
Another mode that increases position accuracy can be the bending wave vibration in the measurement component in a long time, thereby is increased in the information of each time measurement.The frequency response aspect, this can be corresponding to higher frequency resolution.The signal of this expansion also can contain relevant because the information that directly reaches indirect reference of contact.Indirect reference is for arriving the signal of sensor through one or more edge reflections from contact.This method can be regarded the mirror position that is equal at initial sensor as and add more sensor, and can be used for only determining contact position accurately with the source/transducer-translating device of a combination.
A kind of measurement scheme voluntarily can be incorporated contact sensitive device to measure the dispersion of materials relation in parts.When contactless, edge reflection still can occur, and this is the strong reflection that manifests corresponding to the distance on each border for regular shape.For a specific embodiment, known selector, sensor and boundary position are to provide one group of known reference point.But the smooth function of optimization one expression dispersion of materials relation is with around (warp) frequency axis then, thereby recovers the periodicity corresponding to these reference point.If necessary, by additional other known reference point the contact of a precalculated position (for example), can carry out further optimization.
This mode makes does not need to know earlier the dispersion of materials relation when implementing active sensing technology.In addition, it can be used for the little fabrication tolerance that occurs in the counter plate characteristic or the fine setting of the variation that caused by heat, humidity etc.
To a kind of scheme based on reflection, pure absorption needs different implementation methods.Thereby this method can comprise implement a kind of " ray tracing scheme ", wherein and the effect of contact is the ripple that interrupts being incident on one or more sensors.Can produce the ripple that is incident on sensor by direct-drive, for example by one or more selectors, perhaps by indirect excitation from one or more edge reflections at relative position.For indirect excitation, selector can be placed at any position of the position that comprises proximity sense.Moreover indirect excitation makes it possible to detect because as the absorption contact of the single converter of the source of edge reflection and sensor.
The interruption of incident wave also can cause the diffraction to absorption point.Diffraction effect makes absorption method contrast in the wideer regional sensing of pure ray tracing situation.Contact position can be outside the direct-path of the flexural wave that is incident on sensor, and still can influence the signal that sensor is received.The information that absorbs gained can be than contacting more complicated form in reflection.Therefore may need to have more intelligentized detection algorithm, for example class neural network.
The pumping signal that converter produced preferably suppresses noise signal well, and does not preferably have audible harmful or significantly influence acoustically.Therefore, pumping signal can have minimum amplitude or can be similar to noise signal.For the latter, in order to calculate, particular association can be hidden in the noise signal, so that understand.In addition, pumping signal can be inaudible, also is about to frequency and increases to the ultrasound wave that surpasses 20 KHz.The advantage of this tool is to utilize big signal amplitude, and high-frequency is transformed into high spatial resolution.Yet parts must can be kept this ultrasonic signal.Many kinds of materials all are very suitable, for example, and glass, crystal polystyrene.
Can choose pumping signal from any signal of following column signal:
1. pulsed excitation-attention is if it has enough amplitudes, and this will cause very poor squelch and can hear.
2. the noise of frequency band limits-this signal has less audible infringement than the great majority in any assigned frequency band, and has and it can be tuned to the advantage of suitable frequency band.In addition, it can be hyperacoustic.
3. steady-state sine ripple-have splendid signal to noise ratio, but when voiceband for hearing fully.Its improvement is to place voiceband outer or utilize and a plurality ofly have the sine wave of closely being separated by of relative phase at random frequency, thereby makes signal sound more as noise and so on.This is an example that sounds like the signal of noise, improves the hiding relevance of signal to the noise level ratio but have.Another example of this track (trace) is MLS (maximal-length sequence) signal.
4. singing, (chirp) signal-this is by determining at the widely used signal of the frequency response of wide frequency range system to sound.Yet this is only just practical in inaudible ultrasonic frequency.
5. voice signal-when the acoustic radiator parts used as loudspeaker can be with its feed-in converter.In the case, there is no the problem of pumping signal, because this causes the signal of desired voice output just with audible detrimental effect.
When with sensor and selector is closely put together or when the same converter, the background signal that selector produced usually much larger than with contact the signal that is associated.The problem that may cause can relax by many modes like this.For example,, the measurement at sensor can be controlled, so that ratio sensor is advanced to such an extent that begin measurement after farther to external wave what selector produced for the pulsed excitation signal.Yet because of the pulsed excitation signal has relatively poor noise suppression feature, the actuating signal ratio pulsed excitation signal of time expand is more general.
For the pumping signal of time expand, the machinery of the relative amplitude that can be used for improving the contact mark or other technology are arranged, for example:
1) sensor is placed apart from the about 1/4 wavelength place of selector, thereby be minimum in the amplitude that sensing station detected to external wave.If activation signal is to be limited in quite narrow frequency range, can utilize this technology.
2) selector and sensor are placed a drive point, and selector and sensor design are become to press the coupling of orthorhombic form bulk properties.For example, the converter of a bending transducer and inertia coupling can place same point.By can not detecting that arbitrary converter produces for another converter to external wave.Yet, by maximizing its relative amplitude, will detect since contact or border reflect secondaries.
3) problem of emphasis electric field.Utilize scanning (swept) sine to involve the measurement that demodulation stae can be realized frequency response.From selector produce the overall background value of a frequency response to external wave, on this value, superposeed because the fine structure of the less reflection that contact causes.In demodulation (for example by the demodulator circuit of singing) afterwards, output can be the little ripple on the background of big smooth change.Therefore, when Hi-pass filter is passed through in this output, can give prominence to this relevant fine structure with respect to overall background.
4), make that it will be very sensitive to the fine structure on the overall background top by having measured signal digitalized of enough accuracy.Then by outstanding this fine structure of filtering in can numeric field.
Decide according to the use of converter, it can be two, three or four-terminal device.Two-terminal device can be used as sensor or selector respectively.In addition, they are available as difunctional converter, and are determined the function of sensing by the impedance of device.Three and the independent converter of four-terminal device utilization as sensor and selector.For three terminal device, the electrode that sensor and selector shared are common, and sensor and selector are to isolate on electric in four-terminal device.
Each selector or sensor can be the crooked chip converter that directly adheres to parts, for example piezoelectric transducer.Crooked chip converter is generally directivity, is very favourable on some is used.Determine accessible directive property by their bodily form, and therefore can be correspondingly tuning.Other advantage comprises high conversion efficiency, low cost and suitable intensity.
In addition, each selector or sensor can be the inertial transducer that is coupled to parts with single-point.This inertial transducer can be electrodynamic type or piezoelectric type.If in the frequency of being paid close attention to, be compared to crooked wavelength in the parts, contact point is very little, and then inertial transducer is generally omnidirectional type.
For the specified arrangement on using, can on edge-of-part or parts surface relatively equal intervals place converter and/or sensor.
Use and placed the acoustic transducer of appropriate location as sensing and/or selector.This embodiment can utilize minimum additional hardware to increase the convenience of contact screen.Yet if this scheme is impossible, then little piezoelectric element can become optimal converter, and this is because they are fit to can be used as the ultrasonic frequency of active sensor especially.
According to a second aspect of the invention, the contact sensitive device that is provided comprises one can be kept the parts of bending wave vibration and be loaded on sensor on these parts, this sensor is used for measuring at the bending wave vibration of parts and transmits signals to a processor, this processor processing and because the variation of bending wave vibration and the relevant information of contact on parts surface in the parts that contact is produced.
Contact sensitive device can be the passive type sensor, in parts bending wave vibration only by the contact but not by any other the source encouraged.In addition, contact sensitive device can be active formula sensor.Thereby contact sensitive device also can comprise a selector, is used for the bending wave vibration of driver unit thereby detects and contact relevant information.Response by ripple that selector is produced is compared with contact the mechanical constraint that causes, contacts relevant information with calculating.
Parts can be kept the flexural wave of audio range.Thereby contact sensitive device can be a loudspeaker, make the acoustic radiator of this loudspeaker work as the parts of contact sensitive device, and the driver as the selector of contact sensitive device, it is installed on the acoustic radiator, produces voice output with bending wave vibration in the excitation acoustic radiator.
Contact sensitive device also can comprise display device, is used to show the relevant information of being calculated by processor of contact.Therefore, a third embodiment in accordance with the invention provides a display screen as contact sensitive device.This display screen can be one and comprises and can be used for encouraging or the LCD Panel of the liquid crystal of sensing flexural wave.This screen can maintain the flexural wave in the wide frequency range.Direct contact to screen can trigger this contact sensitive device.Therefore, this application makes the standard lcd screen need not other mechanical organ possibility to sensing contact just is provided.
Because this method can be suitable for complicated shape, so mobile phone, hand-held computer or personal digital assistant can comprise according to contact sensitive device of the present invention.For example, according to the present invention, can replace the auxiliary keyboard that is loaded on mobile phone traditionally to contacting very sensitive continous way molding (molding).This scheme can reduce cost and the usable range of expansion is provided on audio applications.In hand-held computer,, can replace the touch panel of mouse controller effect as the continous way molding of contact sensitive device according to the present invention.This molding can be realized according to mouse controller or other substitute (for example keyboard).
Compare with other technology, the advantage of flexural wave contact sensitive device and method is:
1) to position contacting and both very sensitive more multiduty technology of pressure;
2) because of the sophisticated sensors that need not transparent contacts array or magnetic contact (tip) formula etc., so it is the contact sensitive device of cheap form;
3), can be easy to the size and the spatial sensitivity of caliberating device by the material parameter of control assembly; And
4) by utilizing difunctional parts, under very tight space and weight limits, can realize the sound of better quality.
The accompanying drawing summary
Among accompanying drawing by way of example with illustrative the present invention, wherein:
Fig. 1 represents according to sensing contact loudspeaker of the present invention;
Fig. 2 A and 2B reach bending wave loudspeaker afterwards before being illustrated in contact;
Fig. 3 is for incorporating first loudspeaker of passive type sensing contact according to second embodiment of the invention;
Fig. 4 is for incorporating second loudspeaker of passive type sensing contact according to second embodiment of the invention;
Fig. 5 is the calcspar according to the passive type sensing Processing Algorithm of first embodiment of the invention;
Fig. 6 is for incorporating first loudspeaker of active formula sensing contact according to first embodiment of the invention;
Fig. 7 is for incorporating second loudspeaker of active formula sensing contact according to first embodiment of the invention;
Fig. 8 is the calcspar of enforcement layout of the present invention;
Fig. 9 is the calcspar according to the active formula sensing Processing Algorithm of first embodiment of the invention; And
Figure 10 a to 10d is the curve map of dispersion corrected method.
Implement best mode of the present invention
Fig. 1 represents a contact sensitive device 10, and it comprises a transparent contact sensing plate 12 that is installed on display device 14 the place aheads.Display device 14 can be the form of TV, computer screen or other visual display unit.The input pen 18 of one pen shape is used for text 20 or other content are write on this sensing contact plate 12.
Transparent contact sensing plate 12 also can be the sound device that can keep bending wave vibration.Three converters 16 are to be installed on the plate 12.At least two converters 16 are transducer-translating device or sensor, thereby very sensitive and monitoring bending wave vibration to the bending wave vibration in the plate.The 3rd converter 16 also can be transducer-translating device, thereby this system is corresponding to the passive type contact sensitive device of Fig. 3 or Fig. 4.
In addition, the 3rd converter can be the selector of the bending wave vibration that is used for excitation plate, thereby this system is corresponding to the active sensor of Fig. 5.In Fig. 6 of Fig. 7 embodiment, active formula sensor can be as the loudspeaker and the contact sensitive device of combination.
Fig. 2 a and 2b illustrate one and utilize the General Principle of bending wave vibration as the contact sensitive device 22 of sensing element.Contact sensitive device 22 comprises the panel 24 and that can keep bending wave vibration and is installed on transducer-translating device 26 on the panel 24, and this converter is used to detect the bending wave vibration at the panel 24 of this transducer-translating device 26 mounting points.Fig. 2 a represents the vibration mode 28 of bending wave vibration, is normal vibration mode of not interrupting, for example an equilibrium mode under assigned frequency or a transient state pulse mode in this case.
In Fig. 2 b, contact in contact point 30 counter plates 24, and changed vibration mode.By the disturbance flexural wave path in panel 24 or by producing the new flexural wave that sends from contact point 30, contact can change vibration mode 28.Detect the variation of vibration mode 28 by transducer-translating device 26.For example can determine the information that contact is relevant from the reading of transducer-translating device by one first processing unit.This information can be sent to one second processing unit, and it is exported information on display screen.Information can comprise the position that contacts pulse and the details of pressure distribution, for example:
1) Jie Chu x, the y coordinate.
2) Jie Chu characteristic dimension, for example: 1 millimeter corresponding to pen or input pen, and 1 centimetre corresponding to finger.
3) Jie Chu pressure distribution is as the function of time.
Fig. 3 and 4 represents two contact sensitive devices 32,33 in more detail.Contact sensitive device 32,33 comprise one can keep the panel 24 of bending wave vibration and three be used for they respectively mounting points detect the transducer-translating devices 26 of bending wave vibration.When contact point 30 adds upward pressure, then produce vibration mode 28.Because of device does not contain selector, be the passive type contact sensitive device so device can be regarded.Thereby the bending wave panel that only produces in the panel by contact vibrates.
In the passive type sensor, panel 24 intrinsic pulses have begun the flexural wave at trend panel 24 edges and have advanced.Flexural wave is by being detected around three transducer-translating devices 26 of the equidistant installation in edge or by three transducer-translating devices of only being separated by with panel 24 edges on the surface that is installed on panel 24 as Fig. 4 as Fig. 3.Measured bending wave signal is handled to determine to apply the space initial point and the distribution of forces of pulse.
Fig. 5 represents to be used at Fig. 3 or Fig. 4 algorithm in each transducer-translating device 26 detected flexural wave information processing.This algorithm comprises the following step:
I) optimization at the signal of each transducer-translating device to reduce to undesired outer signals minimum.Can utilize the linear prediction of signal to go prediction and eliminate ground unrest.
Ii) calculate frequency response at each converter.
Iii) (optionally) is if can add the information about the contact pulse position when active formula sensing is obtained.
Iv) add material parameter information.
V) utilize (ii), (iii) reach the information that (iv) obtains from step; The dispersiveness of proofreading and correct panel is to obtain the non-dispersive response.
Vi) calculate anti-fast fourier transform (fft) in the response of duration of contact of contact point specific pulse shape.
Vii) the information of pulse shape and positional information are optionally described in output in detail.
The advantage of passive type sensing comprises:
1) this method contains above a kind of frequency and comprises the required enough frequency contents of description pulse shape, and
2) because of this method is the passive type person, power demand is minimum.
The frequency content that a shortcoming of passive type sensing is pulse has limited the frequency content of measured signal.Therefore, will being transformed into quite, the high-frequency information of the crooked wavelength of length is restricted.Thereby the spatial resolution of signal is restricted.
Fig. 6 and another kind of combined type sensing contact of 7 more detailed expressions and audio unit 35,37.These devices respectively contain the selector 31 that the panel 24 and that can keep bending wave vibration is used for encouraging the bending wave vibration of panel 24.Device 35 in Fig. 6 also comprises two and is used to detect the other transducer-translating device 26 that divides the bending wave vibration of other mounting points at them, and the device 37 in Fig. 7 comprises an other transducer-translating device 26.When contact point 30 adds upward pressure, vibration mode 28 is interrupted.Because of these devices comprise a selector 31, can assert that these devices are active formula contact sensitive device.
In Fig. 6, sensing and selector 26,31st separate equidistantly around the edge of panel 24, and in Fig. 7, and sensing and selector 26,31st form distance with the edge of panel 24 and be mounted on its surface.Converter in Fig. 7 equidistantly separates on the surface of panel.
Fig. 8 and 9 illustrates the possible embodiment of active formula contact sensitive device.In Fig. 8, central processing unit 34 outputs one digital output signal 36, this signal converts analog output signal 40 to by digital-analog convertor DAC 38.This analog output signal 40 is fed to amplifier 42, and it is fed to selector 31 with the analog output signal 44 that amplifies.This selector 31 sends the flexural wave pumping signal of the flexural wave 46 in the excitation panel 48.
Two transducer-translating devices 26 are detecting the flexural wave of step 50 detection in panel 48.Transducer-translating device 26 is converted to analog input signal 52 with bending wave vibration, the input end of these signal feed-in analogue-to-digital converters ADC 54.Formed digital input signals 56 is sent to central processing unit 34, determines the position of relevant contact pulse and the information 58 of distribution by this processor.
In Fig. 9, the method for contacting points position is determined in expression, and its step is as follows, and can be carried out by central processing unit shown in Figure 6:
A) measurement is in the frequency response of each transducer-translating device.
B) dispersion relation of correction panel.
C) calculate fft so that to be provided the time response of non-dispersive medium.
D) relatively should time response reference response during with no extraneous touch panel.
E) identification is from the reflection of contact point.
F) carry out echo-bearing according to associated reflections, to discern their source.
G) information of contact position is described in output in detail.
The advantage of active formula sensing comprises:
1) because the response of signal to external world of this commercial measurement, high-frequency information is unrestricted and have a high spatial resolution, and
2) susceptibility of noise can greatly reduce to external world.This can realize by the response that detects in the frequency band (for example being higher than sound spectrum) when outside noise is very little.Alternative method is for this signal provides specific relevance, still can detect when very little even make to compare with ground unrest.
The shortcoming of active formula sensing comprises:
1) this technology distributes insensitive than the possible paired pulses of passive type.Yet more complicated processing can improve this situation.For example, the pressure of finger or pen is bigger, and the degree that may introduce extra damping is bigger.This can be discerned by quite simple other data processing, and
2) demand of signal may be measured more high power than passive type to external world.Hour can make this shortcoming minimum by pumping signal being reduced to as much as possible.In addition, when pumping signal during at high frequency, can utilize sensator, it has very high efficiency advantage.
In many application, the embodiment of a single flexural wave contact sensitive device may be not enough to adapt to all situations usually.For example when voiceless sound when this device is play, the passive type sensor will be worked finely.Yet, when playing loud music, the frequency voiceband outside or utilize music signal more suitable as the active formula sensor that encourages.Therefore it is best settling mode that the combination that surpasses a particular is provably.Moreover the zone of transition between passive type and active formula sensing can obtain Useful Information from two kinds of technology.
Figure 10 a to 10d represents a kind of measured bending wave signal to be converted to from the possible bearing calibration of the transmitting signal of non-dispersive medium.Figure 10 a is the curve map of the response of expression arbitrary unit to the dispersed impulse response of time.Figure 10 b shows the curve map of the response of arbitrary unit to the dispersed frequency response of frequency.Figure 10 c is the curve map of the response of expression arbitrary unit to the non-dispersive resistant frequency response of frequency.Figure 10 d is the curve map of the response of expression arbitrary unit to the non-dispersive impulse response of time.
For the slate bending, velocity of wave is proportional with the square root of frequency, and promptly the high fdrequency component of arbitrary certain wave is advanced sooner than harmonic component.Figure 10 a is illustrated in the pulse in the desirable medium with square root dispersion relation, and confirms that dispersed medium can't keep the waveform of pulse.Is clearly to external wave 60 at time t=0, and face echoed signal 62 is propagated in time, and this makes must determine that correct contact position has problem very much.
The cyclical variation of frequency response is the characteristic of reflection, and is commonly referred to comb filtering.In fact, the cyclical variation in frequency response is to be derived by the wavelength number that meets between source and reverberator.Because frequency increases and meets the wavelength number increase in this space, has outside wave reflection wave disturbance and vibrates between structure property and destructiveness.
The fourier transform of the dispersed impulse response of calculating chart 10a has produced the frequency response shown in Figure 10 b.This frequency response is acyclic, and the cyclical variation of tool wavelength is transformed into the frequency increase slack-off frequency change.This is the result that square root disperses, and its medium wavelength is that the square root with frequency is inversely proportional to.Therefore panel is the function that response is launched into frequency according to the panel dispersiveness about the effect of frequency response.Therefore, by applying anti-expansion at frequency domain, but counter plate disperse to be proofreaied and correct, thereby recover the periodicity that presents in the non-dispersive implementations.
The inverse transformation of utilizing the panel dispersiveness can convert Figure 10 b to the frequency response (Figure 10 c) of non-dispersive implementations around (wrap) frequency axis, and wherein excitation frequency and wavelength are inversely proportional to.This simple relation is that wavelength cyclical variation decrescence is transformed into the cumulative cyclical variation of frequency shown in Figure 10 c.
Anti-fast fourier transform (fft) is used on the track of Figure 10 c, then produces the impulse response shown in Figure 10 d, it has been dispersed proofreaies and correct and has recovered clearly to reflect.Shown in Figure 10 d, because of the ripple of advancing in the non-dispersive medium has fixedly travel rate with they frequency-independents, so any specific pulse waveform will in time be preserved.Therefore, the fixed work in echo position is quite direct.At time t=0, be clearly to external wave 66, clearly reflect 68 and in the time of 4 milliseconds, have.This reflection 68 has 1/4th the amplitude that is about to external wave 66 amplitudes.
Industrial applicability
Thereby the invention provides a kind of grain husk contact sensitive device newly and easily, and a kind of contact sensitive device of being combined with the bending wave panel audio unit.
Claims (29)
1. method of determining the information relevant with the contact on the active contact sensitive device comprises following steps:
One parts that can keep the panel-form of bending wave vibration are provided;
A position from these parts produces the bending wave vibration these parts, to detect and to contact relevant information;
Contact this parts in discrete position, so that be created on the variation of the bending wave vibration that is produced in these parts;
On two positions of these parts, measure the bending wave vibration of the variation in these parts, to determine measured bending wave signal; And
Handle measured bending wave signal, to calculate the information relevant with contact, this processing comprises: apply correction, measured bending wave signal is converted to the transmitting signal from non-dispersive ripple source.
2. the method for claim 1, wherein relevant with contact information comprises position contacting.
3. the method for claim 1, wherein relevant with contact information comprises the pressure of contact.
4. the method for claim 1, wherein relevant with contact information comprises the geometrical length of contact.
5. the method for claim 1, wherein, the continuous signal that the mobile generation one of the contact on these parts is influenced by position contacting, pressure and the speed on parts, and, use is from data continuous time of this continuous signal, to derive the additional information relevant with contact.
6. method as claimed in claim 5 also comprises: use neural network to handle data continuous time.
7. the method for claim 1, wherein relevant with contact information comprises contact type.
8. method as claimed in claim 7 wherein, is selected contact type among the touch of the touch of input pen and finger.
9. the method for claim 1, wherein measuring process comprises: measure the frequency content of measured bending wave signal, to determine contact type.
10. the method for claim 1 also comprises: measured bending wave signal is compared with a reference signal, when produce contact with identification.
11. the method for claim 1, wherein measuring process comprises: measure the bending wave vibration that changes on two edges of these parts, described two edges of these parts are different from residing edge, the position that generates this bending wave vibration.
12. an active contact sensitive device comprises:
Can keep bending wave vibration and when being energized, form the parts of the panel-form of acoustic radiator;
Be couple to one or more drivers of these parts, be used for encouraging the bending wave vibration of these parts, detecting the information relevant, and make this parts produce voice output with the contact that on the surface of these parts, produces;
Be couple at least one sensor of these parts, be used for measuring the bending wave vibration of these parts;
Operationally be couple to the processor of described at least one sensor, be used for according to producing by contact and by the variation at the bending wave vibration of these parts of described at least one sensor measurement, handle and contact relevant information, and apply correction, measured bending wave signal is converted to transmitting signal from non-dispersive ripple source.
13. contact sensitive device as claimed in claim 12, wherein, a driver that is couple in described one or more drivers of these parts is used for encouraging the bending wave vibration in these parts and makes this parts produce voice output.
14. contact sensitive device as claimed in claim 12, wherein, described one or more driver comprises at least two drivers, and each driver that is couple in described at least two drivers of these parts is used for encouraging bending wave vibration and makes this parts produce voice output.
15. contact sensitive device as claimed in claim 14 wherein, is couple to these parts with the bending wave vibration outside the described driver excitation audio frequency that encourages the bending wave vibration in these parts.
16. contact sensitive device as claimed in claim 15, wherein, these parts have homogeneous thickness.
17. contact sensitive device as claimed in claim 12, wherein, described at least one sensor is installed on the edge of these parts.
18. contact sensitive device as claimed in claim 12, wherein, described at least one sensor is installed on these parts and separates with the edge of these parts.
19. an active contact sensitive device comprises:
Can keep the parts of the panel-form of bending wave vibration;
Be couple to the selector of these parts, be used for encouraging the bending wave vibration of these parts, to detect and to contact relevant information;
Be couple at least one sensor of these parts, be used for measuring the bending wave vibration of these parts;
Operationally be couple to the processor of described at least one sensor, be used for according to producing by contact and by the variation at the bending wave vibration of these parts of described at least one sensor measurement, handle the information relevant with the contact of on the surface of these parts, carrying out, and be used to apply correction, measured bending wave signal is converted to transmitting signal from non-dispersive ripple source.
20. contact sensitive device as claimed in claim 19, wherein, this selector is an inertial transducer, and described at least one sensor is a bending transducer.
21. contact sensitive device as claimed in claim 19, wherein, this selector is a bending transducer, and described at least one sensor is an inertial transducer.
22. contact sensitive device as claimed in claim 19, wherein, these parts are display screens, and wherein, this selector comprises the liquid crystal of the display screen of the bending wave vibration in these parts of excitation.
23. a method of determining the information relevant with the contact on the contact sensitive device comprises following steps:
One parts that can keep the panel-form of bending wave vibration are provided;
In these parts, produce bending wave vibration, to detect and to contact relevant information;
Contact this parts in discrete position, so that be created on the variation of the bending wave vibration that is produced in these parts;
Measure the bending wave vibration of the variation in these parts, to determine measured bending wave signal; And
Handle measured bending wave signal, to calculate the information relevant with contact, this processing comprises: apply correction, measured bending wave signal is converted to the transmitting signal from non-dispersive ripple source.
24. the method for parts that is used for keeping bending wave vibration and forms the panel-form of acoustic radiator when being energized, this method comprises:
The selector that use is couple to these parts encourages bending wave vibration;
In being couple at least one sensor of these parts, measure the bending wave vibration in relevant with the contact of on the surface of these parts, carrying out, these parts; And
Processing by described at least one sensor measurement with the relevant information of contact, and apply correction, measured bending wave signal being converted to transmitting signal from non-dispersive ripple source, thereby identification and contact relevant information.
25. method as claimed in claim 24 also comprises: utilize this selector, make these parts produce voice output.
26. method as claimed in claim 24 also comprises: will be by contact signal that produces and the Signal Spacing that produces by this selector.
27. method as claimed in claim 26, wherein, described isolation comprises: carry out predictive filtering, with the response of prediction by the signal of this selector generation.
28. method as claimed in claim 26, wherein, described isolation comprises: use the continuous recording of the signal that is produced, and the signal modeling to producing by this selector.
29. method as claimed in claim 26, wherein, described isolation comprises: use described at least one sensor to determine the position of this selector.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9930404.0 | 1999-12-23 | ||
| GBGB9930404.0A GB9930404D0 (en) | 1999-12-23 | 1999-12-23 | Touch sensor |
| GB0025771.7 | 2000-10-20 | ||
| GB0025771A GB0025771D0 (en) | 2000-10-20 | 2000-10-20 | Contact sensitive device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB00817654XA Division CN100380302C (en) | 1999-12-23 | 2000-12-18 | Contact sensitive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101231566A CN101231566A (en) | 2008-07-30 |
| CN101231566B true CN101231566B (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100743085A Expired - Fee Related CN101231566B (en) | 1999-12-23 | 2000-12-18 | Contact sensing device and method thereof |
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| Country | Link |
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| CN (1) | CN101231566B (en) |
| GB (1) | GB9930404D0 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102169384B (en) * | 2010-12-21 | 2016-12-07 | 合肥海尔洗衣机有限公司 | A kind of method of toch control |
| TWI498778B (en) * | 2012-03-19 | 2015-09-01 | Wistron Corp | Method for syncing different touching systems |
| CN103513758A (en) * | 2012-06-28 | 2014-01-15 | 华为终端有限公司 | Input method of intelligent terminal and intelligent terminal |
| CN103713753B (en) * | 2012-09-29 | 2017-06-27 | 联想(北京)有限公司 | The method and a kind of electronic equipment of a kind of information processing |
| CN103064558B (en) * | 2013-01-07 | 2015-12-23 | 南京大学 | Method and the electronic whiteboard that inputs of tangible gesture of touch gestures input is realized in electronic whiteboard |
| CN109828669B (en) * | 2019-01-31 | 2021-12-31 | 华为技术有限公司 | Touch signal processing method and electronic equipment |
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| US5591945A (en) * | 1995-04-19 | 1997-01-07 | Elo Touchsystems, Inc. | Acoustic touch position sensor using higher order horizontally polarized shear wave propagation |
| US5628031A (en) * | 1993-07-19 | 1997-05-06 | Elonex Ip Holdings Ltd. | Personal digital assistant module implemented as a low-profile printed circuit assembly having a rigid substrate wherein IC devices are mounted within openings wholly between opposite plane surfaces of the rigid substrate |
| US5691959A (en) * | 1994-04-06 | 1997-11-25 | Fujitsu, Ltd. | Stylus position digitizer using acoustic waves |
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- 1999-12-23 GB GBGB9930404.0A patent/GB9930404D0/en not_active Ceased
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- 2000-12-18 CN CN2008100743085A patent/CN101231566B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5628031A (en) * | 1993-07-19 | 1997-05-06 | Elonex Ip Holdings Ltd. | Personal digital assistant module implemented as a low-profile printed circuit assembly having a rigid substrate wherein IC devices are mounted within openings wholly between opposite plane surfaces of the rigid substrate |
| US5691959A (en) * | 1994-04-06 | 1997-11-25 | Fujitsu, Ltd. | Stylus position digitizer using acoustic waves |
| US5591945A (en) * | 1995-04-19 | 1997-01-07 | Elo Touchsystems, Inc. | Acoustic touch position sensor using higher order horizontally polarized shear wave propagation |
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| Publication number | Publication date |
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| CN101231566A (en) | 2008-07-30 |
| GB9930404D0 (en) | 2000-02-16 |
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