CN1952863B

CN1952863B - Touch type induction system

Info

Publication number: CN1952863B
Application number: CN200510100493A
Authority: CN
Inventors: 钟新鸿; 王汉哲; 谢冠宏
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2005-10-18
Filing date: 2005-10-18
Publication date: 2010-05-05
Anticipated expiration: 2025-10-18
Also published as: CN1952863A

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

Touch type inductor

[technical field]

The invention relates to a kind of touch type inductor, particularly about a kind of induction installation by the touch sensible 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 United States Patent (USP) trademark 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 United States Patent (USP) trademark 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 United States Patent (USP) trademark 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 be realized the function of expection by the noise of touch sensible object.

The purpose of this invention is to provide a kind of touch type inductor.This device comprises: a gate circuit, an inductor, a signal source, one first load circuit and one second load circuit.This gate circuit has a first input end and one second input end; This inductor is connected in second input end of this gate circuit; This signal source has one first output terminal and second output terminal; This first load circuit is connected between second input end of second output terminal of this signal source and this gate circuit; This second load circuit is connected between second input end of second output terminal of this signal source and this gate circuit; This induction installation also comprises a differential signal source and two electric conductors, and the cathode output end of this differential signal source and cathode output end connect an electric conductor respectively, and this inductor and constitutes two electric capacity with these two electric conductors between these two electric conductors.

Compared to prior art, described touch type inductor adopts gate circuit, can effectively improve the sensitivity of this touch type inductor induction noise, 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.

Fig. 2 is the pulse change figure of embodiment these induction installation input and output before and after object touches 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, a gate circuit 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.One of them is connected the positive and negative polarities of this differential signal source 11 with this two electric conductors 12 respectively.This inductor 13 constitutes two electric capacity with these two electric conductors 12 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 gate circuit 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 gate circuit 15 jointly, one of this capacitor C end ground connection.The output terminal of this gate circuit 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, the AC signal that phase place is opposite, in the residing environment of this touch type inductor, there is the image of noise in the capital, 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 circuit. two output terminals of this signal source 14 connect two load circuits respectively, can be these two load circuits provides the signal of identical size and phase place, scalable first resistance R 1, the size of second resistance R 2 and capacitor C, make the input signal of 15 two input ends of this gate circuit identical, this gate circuit 15 is when the input signal of two input end is identical, it is output as one first state, at the input signal of two input end not simultaneously, it is output as one second state. and what this gate circuit 15 adopted in the present embodiment is XOR gate, be that input signal is when identical, it is output as low level, at input signal not simultaneously, it is output as high level. at object (as finger) when touching this inductor 13, these inductor 13 sense objects with noise, then the input end input signal of this gate circuit 15 that links to each other with this inductor 13 postpones, the input signal of two input ends of this gate circuit is no longer identical, thereby cause the variation of the output pulse of this gate circuit, concrete pulse change sees also Fig. 2, detector 16 detects this variation, get final product the touch of judgment object, 17 pairs of these signals of signal processing circuit are handled to realize control corresponding, wherein, the object touch inductor can directly touch, also can be across other objects, as insulants such as plastic plates.

See also Fig. 2, touch the pulse change figure of these induction installation input and output of front and back for the embodiment of touch type inductor at object.As shown, pulse A and pulse B are the pulse diagram of the input signal of two input ends of this gate circuit 15 before object touches, the size of these two signals, phase place is all identical, and pulse C is the pulse diagram of the output terminal output signal of this gate circuit 15, and what adopt in the present embodiment is XOR gate, characteristic according to this XOR gate, be that input signal is identical, be output as low level, the input signal difference, be output as high level, according to this characteristic of XOR gate, then at this, this gate circuit 15 is output as low level.This detector 16 is every the time detecting of two/one-period of this signal source 14 signal that the produces output terminal of this gate circuit 15 once, if this gate circuit 15 of detecting is output as low level, then the signal of this detector 16 also is low, if this gate circuit 15 is output as high level, then the output signal of this detector 16 is a high level also, and when object did not touch, the output of this gate circuit 15 was in low level state always, then the signal of this detector 16 also is a low level state, specifically shown in pulsed D.

When object touches this inductor 13, these inductor 13 sense objects with noise, the phase place of the input end input signal of the gate circuit 15 that links to each other with this inductor 13 is postponed, shown in pulse B-sense, characteristics according to XOR gate, input signal is not simultaneously, be output as high level, then the output signal of this gate circuit 15 obtains changing for continuing low level state, if object leaves this inductor 13, then the input signal of two of this gate circuit 15 input ends returns to identical state again, then its output also reverts to low level, specifically shown in pulse C-sense, when this detector 16 has high level to produce at the output terminal that detects this gate circuit 15, then the signal of this detector 16 is set to high level, when object leaves this inductor 13, the detection signal that corresponding this detector 16 is detected also becomes low level with this gate circuit 15, specifically shown in pulsed D-sense, at this, the time that can continue high level according to the output signal of this detector 16 judges that this object touches the time of this induction installation.

Claims

1. touch type inductor, comprising: a gate circuit has a first input end and one second input end; One inductor is connected in second input end of this gate circuit; One signal source has one first output terminal and second output terminal; One first load circuit is connected between the first input end of first output terminal of this signal source and this gate circuit; One second load circuit is connected between second input end of second output terminal of this signal source and this gate circuit; It is characterized in that, this induction installation also comprises a differential signal source and two electric conductors, the cathode output end of this differential signal source and cathode output end connect an electric conductor respectively, and this inductor and constitutes two electric capacity with these two electric conductors between these two electric conductors.

2. touch type inductor as claimed in claim 1 is characterized in that, when this inductor was not touched, the input signal of the first input end of this gate circuit and second input end was identical.

3. touch type inductor as claimed in claim 1 is characterized in that, this second load circuit can be made of electric capacity and one first resistance, and this first resistance links to each other with this signal source, and this electric capacity and this first resistance are connected to one of this gate circuit input end jointly.

4. touch type inductor as claimed in claim 1 is characterized in that, this second load circuit can be made of one second resistance.

5. touch type inductor as claimed in claim 1 is characterized in that this induction installation also comprises a detector, is connected in the output terminal of this gate circuit, is used to detect the signal by this gate circuit output.

6. touch type inductor as claimed in claim 5 is characterized in that this touch type inductor also comprises a signal processing circuit, and this signal processing circuit is connected in the output terminal of this detector, is used to handle the signal of this detector detecting.

7. touch type inductor as claimed in claim 1 is characterized in that this gate circuit can be XOR gate.