CN100426211C - Touch type induction system - Google Patents
Touch type induction system Download PDFInfo
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- CN100426211C CN100426211C CNB2005101005573A CN200510100557A CN100426211C CN 100426211 C CN100426211 C CN 100426211C CN B2005101005573 A CNB2005101005573 A CN B2005101005573A CN 200510100557 A CN200510100557 A CN 200510100557A CN 100426211 C CN100426211 C CN 100426211C
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Abstract
This invention provides one trigger sensor device, which comprises one difference signal source to generate two alternating signals with same frequency and different phase; two conductors separately connected to positive and negative ends of difference signal source; one sensor to receive object touch mixture signals between two to form two capacitors; one signal sources with two output ends through two load circuit and amplifier two input ends to form amplifier common mode input through amplifier signals.
Description
[technical field]
The invention relates to a kind of touch type inductor, particularly about a kind of induction installation by touch sensible object noise.
[background technology]
Now existing various types of induction installations, and be applied to department of computer science and unify during other uses, it is a kind of that people are familiar with the most in this device is computing machine " Genius mouse ".Although Genius mouse is extremely general as the position indicating equipment, precisely because have mechanical part, and require to have a plane, make the position ball to roll thereon, and for rational resolution is arranged, Genius mouse need roll usually than long distance, last Genius mouse needs the user to lift hand so that cursor moves, thus the fundamental purpose of having disturbed people to key in from computing machine.
People attempt to provide a kind of device through multiple trial, and to detect as the thumb of indicating equipment or the position of other finger, to replace Genius mouse, the ideal behavior of this equipment is low-power consumption, high resolving power, low cost.Now existing polytype touch type inductor is as resistance-type, inductance type and condenser type.
The patent No. of bulletin is 6534970 patent as U.S. trademark patent office on March 18th, 2003, it has disclosed a kind of rotary location detecting technology that utilizes the inductance technology, described technology comprises two parts, first is by centering on the magnetic field that rotatablely moves and change of turning axle on the space, second portion comprises that two inductors are used for responding to the magnetic field that first produces, and produce corresponding signal, above-mentioned signal changes along with the variation of the relative angle of first and second portion, then can measure the relative position of first and second portion according to the signal that changes.
The patent No. of bulletin is 6545614 patent as U.S. trademark patent office on April 8th, 2003.It has disclosed a kind of resistance induction installation, this device comprises an oscillation circuit unit and an electronic nodes unit, described oscillation circuit unit provides a radio-frequency signal for the electronic nodes unit, if detector detects the touch of object as finger, the impedance of electronic nodes unit will change thereupon, the resistance of the input end of resistance that then produces when the finger touch electronic nodes and electronics economize on electricity is complementary, reflection wave diminishes, and can determine that object touches by the detection of reflected ripple and with itself and a Discr. unit comparison if reflectance diminishes.
The patent No. of U.S.'s trademark patent office bulletin on February 27th, 1996 is 5495077 patent for another example, and it has disclosed a kind of electric capacity position sensor, and described inductor has a characteristic electric capacity on the lead on the vertical and horizontal direction that links to each other with induction bonding pad.Described electric capacity will change with respect to the motion of induction matrix along with the activity of the touch of object or object, the changes in capacitance of each intersection point of X and Y direction is converted into the voltage on X and the Y direction in the matrix, and these voltages produce the electronic signal of representing the object center after the processing of circuit by analysis.
Though above-mentioned patented technology has had improvement on performance, fast as response speed, the resolution height, simple to operate, the equal more complicated of its structure and circuit, production cost is also higher, and its power consumption is bigger, the not high easy generation maloperation of finger accuracy of sensors.
[summary of the invention]
Based on foregoing, the object of the present invention is to provide a kind of touch type inductor, this induction installation can pass through the noise of touch sensible object, thereby realizes the function of expection.
The objective of the invention is to realize, a kind of touch type inductor is provided by following scheme.This device comprises: a differential signal source, two electric conductors, an inductor, a signal source, an amplifier.This differential signal source, it is identical to produce two frequencies, the AC signal that phase place is opposite; These two electric conductors link to each other with positive and negative two input ends of this differential signal source respectively; This inductor, the noise that produces when being used to receive the object contact, it and constitutes an electric capacity with an electric conductor wherein respectively between these two electric conductors; This amplifier is used to amplify the signal of this amplifier of flowing through; This signal source, two output terminals are arranged, one output terminal connects an end of one first load circuit, the other end of this load circuit is connected to this amplifier one input end, another output terminal of this signal source connects one second load circuit, this second load circuit and this inductor are connected to another input end of this amplifier jointly, the voltage of two input ends of this amplifier equates, constitute the common mode input of this amplifier, when object touches this inductor, the noise of this object that inductor is responded to makes the non-common mode input of being input as of this amplifier, then have signal flow through this amplifier, this device also comprises a differential signal source and two electric conductors, and these two electric conductors link to each other with positive and negative two output terminals of this differential signal source respectively, this inductor and constitutes two electric capacity with two electric conductors between two electric conductors.
Compared to prior art, described touch type inductor can effectively reduce noise in the surrounding environment to the influence of this induction installation, and its simple circuit also can reduce manufacturing cost.
[description of drawings]
Fig. 1 is the circuit diagram of the embodiment of touch type inductor.
[embodiment]
See also Fig. 1, be the circuit diagram of the embodiment of touch type inductor.This touch type inductor comprises a differential signal source 11, two electric conductors 12, an inductor 13, a signal source 14, one first load circuit 18, one second load circuit 19, an amplifier 15, a detector 16 and signal processing circuits 17.In the present embodiment, this first load circuit 18 can be made of a capacitor C and one first resistance R 1, and this second load circuit 19 can be made of one second resistance R 2.The positive and negative polarities of this differential signal source 11 are connected with one of them electric conductor 12 respectively, and this inductor 13 constitutes an electric capacity with an electric conductor 12 wherein respectively between these two electric conductors 12.This signal source 14 has two output terminals, wherein an output terminal connects this second resistance R 2, this second resistance R 2 is connected to one of this amplifier 15 input end jointly with this inductor, another output terminal of this signal source 14 connects this first resistance R 1, this first resistance R 1 and this capacitor C are connected to another input end of this amplifier 15 jointly, this capacitor C one end ground connection, the output terminal of this amplifier 15 connects the input end of this detector 16, and the output terminal of this detector 16 connects this signal processing circuit 17.
This differential signal source 11 is used to produce two frequencies and equates that the AC signal that phase place is opposite in the residing environment of this touch type inductor, all can have the influence of noise, and these noises can be produced by some electrified bodys, as fluorescent tube, computer etc.These noises have the signal of irregular waveform for some.When these noises act on the above-mentioned electric capacity that is made of this differential signal source 11 and these two electric conductors, because these two electric conductors 12 link to each other with negative pole with the positive pole of this differential signal source 11 respectively, then can be offset by the signal that the negative pole of this differential signal source 11 produces via the positive half-wave of the noise of these two electric capacity, and can be offset by the signal that the positive pole of differential signal source 11 produces via the negative half-wave of the noise of these two electric capacity, so can reduce of the influence of surrounding environment noise to the circuit of this induction installation.Two output terminals of this signal source 14 connect first load circuit 18 and second load circuit 19 respectively, the signal of identical size and phase place is provided for these two load circuits 18,19, and can be by regulating first resistance R 1, the size of second resistance R 2 and capacitor C, the voltage of 15 two input ends of this amplifier is equated, constitute the common mode input, thereby the circuit of this induction installation is in a kind of equilibrium state, the output of amplifier 15 no signals.When object touches this inductor 13, inductor 13 sense object with noise, the voltage of the input end that this amplifier 15 links to each other with this inductor 13 is changed, the noise of 13 sense objects of inductor makes the non-common mode input of being input as of this amplifier 15, thereby destroyed the equilibrium state before touching, then have part signal this amplifier 15 of flowing through, this signal is detected by detector 16 after this amplifier 15 amplifies easilier.So, can determine the touch of object according to the variation of 16 detection signals of detector before and after the object touch.The signal that is produced in the time of can touching via 17 pairs of objects of this signal processing circuit is at last done further processing, to realize function corresponding, wherein, can directly touch this inductor 13 when object touches this inductor 13 also can be across other objects, as insulants such as plastic plates.
Claims (5)
1. touch type inductor comprises: an amplifier, a first input end and one second input end are arranged, and be used to amplify the signal of this amplifier of flowing through; One inductor is connected in second input end of this amplifier, is used to receive the noise that produces when object touches; One signal source has one first output terminal and second output terminal, and being used for provides input signal to first and second input end of this amplifier; One first load circuit is connected between the first input end of first output terminal of this signal source and this amplifier; One second load circuit is connected between second input end of second output terminal of signal source and this amplifier; When inductor is not touched, two input ends of this amplifier constitute the common mode input, when this inductor is touched, the noise of the object that this inductor received makes the non-common mode input of being input as of this amplifier, then the signal that is produced by this non-common mode input amplifies back output through this amplifier, it is characterized in that, this device also comprises a differential signal source and two electric conductors, these two electric conductors link to each other with positive and negative two output terminals of this differential signal source respectively, this inductor and constitutes two electric capacity with two electric conductors between two electric conductors.
2. touch type inductor as claimed in claim 1, it is characterized in that, this first load circuit can be made of electric capacity and one first resistance, and wherein this first resistance links to each other with this signal source, and this electric capacity and this first resistance are connected to an input end of this amplifier jointly.
3. touch type inductor as claimed in claim 1 is characterized in that, this second load circuit can be made of one second resistance.
4. touch type inductor as claimed in claim 1 is characterized in that, also comprises a detector, is connected in the output terminal of this amplifier, is used to detect the signal by this amplifier output.
5. touch type inductor as claimed in claim 4 is characterized in that, also comprises a signal processing circuit, is connected in the output terminal of this detector, is used to handle the signal of this detector detecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101005573A CN100426211C (en) | 2005-10-19 | 2005-10-19 | Touch type induction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101005573A CN100426211C (en) | 2005-10-19 | 2005-10-19 | Touch type induction system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1952864A CN1952864A (en) | 2007-04-25 |
| CN100426211C true CN100426211C (en) | 2008-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101005573A Expired - Fee Related CN100426211C (en) | 2005-10-19 | 2005-10-19 | Touch type induction system |
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| CN (1) | CN100426211C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7830157B2 (en) * | 2007-12-28 | 2010-11-09 | 3M Innovative Properties Company | Pulsed capacitance measuring circuits and methods |
| CN101539826B (en) * | 2008-03-21 | 2012-10-10 | 奇美电子股份有限公司 | Image display system |
| CN101546232B (en) * | 2008-03-24 | 2011-07-13 | 达诺光电股份有限公司 | Panel voltage active compensation circuit |
| CN101599758B (en) * | 2008-06-02 | 2011-07-06 | 盛群半导体股份有限公司 | Capacitive key device |
| TWI459257B (en) * | 2011-10-14 | 2014-11-01 | Au Optronics Corp | Method for determining touch position of a touch panel |
| CN103475352B (en) * | 2013-09-06 | 2017-07-25 | 深圳市芯海科技有限公司 | The detection circuit of capacitance touch button |
| CN106775141B (en) * | 2015-12-30 | 2019-09-27 | 深圳市汇顶科技股份有限公司 | Capacitance sensing circuit and touch panel |
| CN109445628B (en) * | 2018-10-17 | 2019-09-27 | 湖南锐阳电子科技有限公司 | The reading circuit and its large scale capacitance touching control screen of large scale capacitance touching control screen |
| KR20220024860A (en) * | 2019-06-26 | 2022-03-03 | 텍추얼 랩스 컴퍼니 | phase detection of objects |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6545614B1 (en) * | 1996-09-28 | 2003-04-08 | Omron Corporation | Touch sensor identifying a body part |
| CN1503118A (en) * | 2002-11-21 | 2004-06-09 | ���ǵ�����ʽ���� | Apparatus and method for preventing noise in a touch screen |
-
2005
- 2005-10-19 CN CNB2005101005573A patent/CN100426211C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6545614B1 (en) * | 1996-09-28 | 2003-04-08 | Omron Corporation | Touch sensor identifying a body part |
| CN1503118A (en) * | 2002-11-21 | 2004-06-09 | ���ǵ�����ʽ���� | Apparatus and method for preventing noise in a touch screen |
Non-Patent Citations (1)
| Title |
|---|
| 一种新颖触摸开关的原理和应用. 刘金贵，杨天玉.仪器仪表用户，第8卷第3期. 2001 * |
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| Publication number | Publication date |
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| CN1952864A (en) | 2007-04-25 |
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