CN101315287B - Condenser type contact sensor - Google Patents
Condenser type contact sensor Download PDFInfo
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- CN101315287B CN101315287B CN2007101054901A CN200710105490A CN101315287B CN 101315287 B CN101315287 B CN 101315287B CN 2007101054901 A CN2007101054901 A CN 2007101054901A CN 200710105490 A CN200710105490 A CN 200710105490A CN 101315287 B CN101315287 B CN 101315287B
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Abstract
A capacitive touch sensor comprises a square wave generating unit for generating a high frequency square wave clock pulse, a panel induction unit for generating a panel signal after receiving the high frequency square wave clock pulse, a peak value detecting unit for generating an analog peak value signal after receiving the panel signal, an analog to digital conversion unit for generating a digital peak value signal after receiving the analog peak value signal, and a control unit for receiving the digital peak value signal, distinguishing whether the signal induction unit is touched or not according to the level of the digital peak value signal, and generating a detecting signal. Through the capacitive touch sensor, the conversion quantity of variable capacitance is converted into the change of DC voltage, which is read by the control unit through the analog to digital conversion unit, thus avoiding the occupation state of a central processing unit because of reading the change of the capacitance. Furthermore, switch signals and the input signals of the analog to digital conversion unit can be matched into an array framework, so that less input-output quantities can be utilized to read the states of more panels.
Description
Technical field
The present invention is relevant for condenser type contact sensor, particularly relevant for the condenser type contact sensor of the resource that can save CPU (central processing unit).
Background technology
Fig. 1 is the Organization Chart of existing condenser type contact sensor.As shown in the drawing, this condenser type contact sensor 10 comprises an electric capacity 11, a resistance 12, a panel 13 and a port,input-output 14.Because when panel 13 is touched by finger, its stray capacitance value Cx can change (becoming big).Therefore, this condenser type contact sensor 10 utilize the mode that discharges and recharges to detect panel (sensor, sensor) 13 over the ground the variable quantities of stray capacitance value Cx are touched to judge whether panel 13 has.Fig. 2 is that usage count (count) mode is calculated the waveform synoptic diagram of discharge time.That is, its stray capacitance value Cx can become greatly when panel 13 is touched by finger, and relative discharge time also can be elongated.So, can judge by the length of discharge time whether panel 13 has and be touched.
But, because the variable quantity of the stray capacitance value Cx of panel 13 is little, the speed of the sampling/counting (Sample/count) of above-mentioned existing condenser type contact sensor is very fast, and whether have touched, so will take the bigger resource of CPU (central processing unit) if can distinguish out panel 13.And each independent port,input-output 14 can only be handled one group of sensor, and when the quantity of sensor increases, must increase the port,input-output 14 of relative populations.
Summary of the invention
Because the problems referred to above the objective of the invention is to propose the condenser type contact sensor that a kind of reduction takies the resource of CPU (central processing unit).
Another object of the present invention is the condenser type contact sensor that proposes a kind of array architecture, utilizes less port,input-output to reach and detects more panel.
For reaching above-mentioned purpose, condenser type contact sensor of the present invention comprises a square wave generation unit, is used for producing a high frequency square wave time clock; One panel sensing unit produces a partitioned signal after receiving the high frequency square wave time clock, and when an object during near described panel sensing unit, the peak value of described panel signal changes; One peak detection unit produces a simulated peak signal behind the receiving plane partitioned signal; One analog digital converting unit produces a digital peak signal behind the reception simulated peak signal; And a control module, receive the digital peak signal, and distinguish according to the variation in this digital peak signal whether the panel sensing unit has and touched, and produce a detection signal.
For reaching above-mentioned purpose, condenser type contact sensor of the present invention comprises a square wave generation unit, is used for producing a high frequency square wave time clock; N impact damper, respectively by N control signal control, and N control signal can only have a control signal to be enabled at one time; A plurality of panel sensing units, each panel sensing unit receives the high frequency square wave time clock respectively, and then produce a partitioned signal, when an object during near the panel sensing unit, the peak value of panel signal changes, and the panel sensing unit constitutes the panel sensing unit matrix architecture of NxM, and the input end of each row panel sensing unit is connected in the wherein output terminal of an impact damper of N impact damper; M peak detection unit receives the panel signal of the panel sensing unit of M row respectively, and produces a simulated peak signal respectively; M analog digital converting unit receives the simulated peak signal of M peak detection unit respectively, and produces a digital peak signal respectively; And a control module, receive M digital peak signal in regular turn, and distinguish according to the variation in each digital peak signal whether a plurality of panel sensing units have and touched, and then produce a plurality of detection signals.
Convert the variable quantity of variable capacitance Cx the variation of DC voltage to, control module reads the variation of DC voltage again with analog digital converting unit afterwards, and the CPU (central processing unit) that can avoid control module is because of reading the occupied situation of capacitance variations.Simultaneously, because the input signal of switching signal and analog digital converting unit can mix into array architecture, therefore can utilize less port,input-output quantity to read more panel state.
Description of drawings
Fig. 1 is the Organization Chart of existing condenser type contact sensor.
Fig. 2 calculates the waveform synoptic diagram of discharge time for the usage count mode.
Fig. 3 shows the framework of condenser type contact sensor of the present invention.
Fig. 4 is the embodiment of single condenser type contact sensor.
Fig. 5 realizes the embodiment of the condenser type contact sensor of 9 panels for the 3x3 array architecture.
Description of drawings:
30 condenser type contact sensors
31 square wave generation units
32 panel sensing units
33 peak detection units
34 analog digital converting unit
Embodiment
Describe condenser type contact sensor of the present invention in detail below with reference to accompanying drawing.
Fig. 3 shows the framework of condenser type contact sensor of the present invention.As shown in the drawing, condenser type contact sensor 30 of the present invention comprises a square wave generation unit 31, a panel sensing unit 32, a peak detection unit 33 and an analog digital converting unit 34.Square wave generation unit 31 is used for producing a high frequency square wave time clock.Panel sensing unit 32 comprises variable capacitance (stray capacitance) Cx of a resistance R and a panel, so panel sensing unit 32 can be considered a low-pass filter.Whether variable capacitance Cx can be along with there being capacitive object whether approaching and change its capacitance.Therefore, this high frequency square wave time clock produces the panel signal through panel sensing unit 32 backs.The capacitance that this panel signal is different according to variable capacitance Cx, its peak value also can be different.So, utilize peak detection unit 33 can detect the peak value of variable capacitance Cx.Whether at last, the control module of condenser type contact sensor (figure do not show) can be distinguished panel according to the variation of peak value has and is touched.Because the variation of peak value is slow, therefore can effectively reduce the use amount of resource of the CPU (central processing unit) (CPU) of control module.The variable quantity of variable capacitance Cx is converted to the variation of direct current (DC) voltage (or electric current), read the variation of DC voltage afterwards again via analog digital converting unit ADC, can avoid control module (figure does not show) because of reading the occupied situation of capacitance variations.
Fig. 4 is the embodiment of single condenser type contact sensor.As shown in the drawing, the high frequency square wave time clock can be provided by a square wave generation unit.The high frequency square wave time clock produces a partitioned signal through panel sensing unit 32 backs.Panel sensing unit 32 is made of the variable capacitance Cx of resistance R and panel, can be considered a low-pass filter.Peak detection unit 33 is made of resistance and electric capacity parallel circuit at this embodiment.Certainly, this peak detection unit 33 also can be connected in series a diode D.Peak detection unit 33 produces the simulated peak signal after can maintaining the crest voltage of panel signal of panel sensing unit 32.Therefore, the control module of condenser type contact sensor 40 (figure does not show) can utilize analog digital converting unit ADC to read the simulated peak signal that peak detection unit 33 is produced periodically, and produces the digital peak signal.So the control module of condenser type contact sensor 40 is as long as relatively whether this digital peak signal surpasses a critical value and can learn whether panel has and touched, and produce a detection signal.
Greatly reduce because condenser type contact sensor of the present invention takies the resource of the CPU (central processing unit) of control module, therefore the panel sensing unit can be designed to array (Matrix) framework, further reduce the use amount of port,input-output.Fig. 5 realizes the embodiment of the condenser type contact sensor of a plurality of panels for the NxM array architecture, and wherein the N of this embodiment and M are 3.As shown in Figure 5, the condenser type contact sensor 50 of this array architecture comprises the individual analog digital converting unit ADC0 of the individual peak detection units 531～533,3 of the individual panel sensing units 511～519,3 of the individual impact dampers 541～543,9 of 3 (N) (NxM) (M) (M)～ADC2 and control module.Whether and port,input-output IOB0～IOB2 is an input simulated peak signal I/O port IOA0～IOA2 is by control module control, to export conducting that 3 control signals come controller buffer 541～543 respectively.Each panel sensing unit 511～519 comprises a resistance R and the stray capacitance Cx that panel produced.Each peak detection unit 531～533rd is made of resistance and electric capacity parallel circuit.Certainly, each peak detection unit 531～533 also can use three diode D1～D9 respectively, uses the signal of avoiding between a plurality of panel sensing units and interacts.N and M are the integer greater than 1.
The action of the condenser type contact sensor 50 of this array architecture is to utilize the principle of TCM to realize.That is, control module only can allow wherein at each time point the panel sensing unit of delegation can receive the high frequency square wave time clock.Therefore, each peak detection unit only can receive the output signal of a panel sensing unit, and then judges whether panel in the panel sensing unit of this row has and touched.Below describe the motion flow of the condenser type contact sensor 50 of this array architecture in detail.
At first, control module enables I/O port IOA0 signal, makes the high frequency square wave time clock be input to panel sensing unit 511～513.Because port,input-output IOA1 and IOA2 are disable signal, thus not high frequency square wave time clock input of panel sensing unit 514～519, so peak detection unit 531～533 receives only the output signal of panel sensing unit 511～513.Simultaneously, the control module of condenser type contact sensor 50 (figure do not show) is the digital peak signal of sampling simulation digital conversion unit ADC0～ADC2 in regular turn, and whether differentiate panel sensing unit 511～513 has and touched.
Then, control module enables I/O port IOA1 signal, makes the high frequency square wave time clock be input to panel sensing unit 514～516.Because port,input-output IOA0 and IOA2 are disable signal, thus not high frequency square wave time clock input of panel sensing unit 511～513,517～519, so peak detection unit 531～533 receives only the output signal of panel sensing unit 514～516.Simultaneously, the control module of condenser type contact sensor 50 is the digital peak signal of sampling simulation digital conversion unit ADC0～ADC2 in regular turn, and whether differentiate panel sensing unit 514～516 has and touched.
At last, control module enables I/O port IOA2 signal, makes the high frequency square wave time clock be input to panel sensing unit 517～519.Because port,input-output IOA0 and IOA1 are disable signal, thus not high frequency square wave time clock input of panel sensing unit 511～516, so peak detection unit 531～533 receives only the output signal of panel sensing unit 517～519.Simultaneously, the control module of condenser type contact sensor 50 (figure do not show) is the digital peak signal of sampling simulation digital conversion unit ADC0～ADC2 in regular turn, and whether differentiate panel sensing unit 517～519 has and touched.
Condenser type contact sensor of the present invention need not utilize CPU (central processing unit) to calculate discharge time, and a peak value that only needs the cycle read variable capacitance Cx can be judged whether sensor is in and be touched state.Therefore, condenser type contact sensor of the present invention can be saved the resource of CPU (central processing unit).Moreover, because condenser type contact sensor of the present invention can be designed to the panel sensing unit array (Matrix) framework, further reduce the use amount of port,input-output.
Though more than with embodiment condenser type contact sensor of the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, the sector person can carry out various distortion or change.
Claims (8)
1. a condenser type contact sensor is characterized in that, described condenser type contact sensor comprises:
One square wave generation unit, it is used for producing a high frequency square wave time clock;
One panel sensing unit, it receives described high frequency square wave time clock, and then produces a partitioned signal, and when an object during near described panel sensing unit, the peak value of described panel signal changes;
One peak detection unit, it receives described panel signal, and then produces a simulated peak signal;
One analog digital converting unit, it receives described simulated peak signal, and then produces a digital peak signal; And
One control module, it receives described digital peak signal, and judges according to the variation in this digital peak signal whether described panel sensing unit is in the state that touched, and then produces a detection signal.
2. condenser type contact sensor as claimed in claim 1 is characterized in that, described panel sensing unit comprises:
One resistance, one first termination of this resistance is received described high frequency square wave time clock; And
One panel electric capacity, one first end of this panel capacitance is connected in one second end of described resistance and produces described panel signal, and one second end ground connection of described panel capacitance.
3. condenser type contact sensor as claimed in claim 1 is characterized in that, described peak detection unit comprises:
One resistance, one first termination of this resistance are received described panel signal and are produced described simulated peak signal, one second end ground connection of described resistance; And
One electric capacity, it is connected with parallel way with described resistance.
4. condenser type contact sensor as claimed in claim 3 is characterized in that, described peak detection unit also comprises:
One diode, the P utmost point of this diode is connected in described panel sensing unit, and the N utmost point of described diode is connected in described resistance.
5. a condenser type contact sensor is characterized in that, described condenser type contact sensor comprises:
One square wave generation unit, it is used for producing a high frequency square wave time clock;
N impact damper, it is respectively by the control of N control signal, and a described N control signal can only have one of them control signal to be enabled at one time, and wherein N is the integer greater than 1;
A plurality of panel sensing units, each panel sensing unit receives described high frequency square wave time clock respectively, and then produce a partitioned signal, when an object during near described panel sensing unit, the peak value of described panel signal changes, and described panel sensing unit constitutes the matrix architecture of the capable M row of N, and the input end of described each row panel sensing unit is connected to the output terminal of one of them impact damper of a described N impact damper, and wherein M is the integer greater than 1;
M peak detection unit, it receives the described panel signal of the panel sensing unit of described M row respectively, and produces a simulated peak signal respectively;
M analog digital converting unit, it receives the simulated peak signal of a described M peak detection unit respectively, and produces a digital peak signal respectively; And
One control module, it receives the digital peak signal of a described M analog digital converting unit in regular turn, and judge according to the variation in this each digital peak signal whether described a plurality of panel sensing unit is in the state that is touched, and then produce a plurality of detection signals;
Wherein, described control module also produces a described N control signal.
6. condenser type contact sensor as claimed in claim 5 is characterized in that, described panel sensing unit comprises:
One resistance, one first termination of this resistance is received described high frequency square wave time clock; And
One panel electric capacity, one first end of this panel capacitance is connected in one second end of described resistance, and one second end ground connection of described panel capacitance.
7. condenser type contact sensor as claimed in claim 6 is characterized in that, described each peak detection unit more comprises:
N diode, wherein, the P utmost point of this each diode is connected to the output terminal of corresponding described panel sensing unit, and the N utmost point of described each diode is connected to each other;
One resistance, one first end of this resistance are connected in the N utmost point of a described N diode and produce described simulated peak signal, one second end ground connection of described resistance; And
One electric capacity, it is connected with parallel way with described resistance.
8. condenser type contact sensor as claimed in claim 7 is characterized in that, described control module enables N control signal in regular turn, makes the high frequency square wave time clock be input to M corresponding panel sensing unit in regular turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101054901A CN101315287B (en) | 2007-06-01 | 2007-06-01 | Condenser type contact sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101054901A CN101315287B (en) | 2007-06-01 | 2007-06-01 | Condenser type contact sensor |
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| CN101315287A CN101315287A (en) | 2008-12-03 |
| CN101315287B true CN101315287B (en) | 2010-12-15 |
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| CN2007101054901A Expired - Fee Related CN101315287B (en) | 2007-06-01 | 2007-06-01 | Condenser type contact sensor |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096493A (en) * | 2009-12-11 | 2011-06-15 | 佳士得科技股份有限公司 | Load cell touch device |
| CN102130675B (en) * | 2010-01-14 | 2013-02-20 | 台达电子工业股份有限公司 | Touch inductive circuit and method |
| CN102193695A (en) * | 2010-03-05 | 2011-09-21 | 启迪科技股份有限公司 | Touch panel test equipment and detecting device thereof |
| US9471179B2 (en) | 2010-08-20 | 2016-10-18 | Serafim Technologies Inc. | Laser optical touch control module analog-to-digital conversion system and method of the same |
| US9065447B2 (en) * | 2012-04-11 | 2015-06-23 | Ford Global Technologies, Llc | Proximity switch assembly and method having adaptive time delay |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5625382A (en) * | 1992-02-21 | 1997-04-29 | Mitsubishi Denki Kabushiki Kaisha | Display-integrated tablet |
| US20050146513A1 (en) * | 2003-12-31 | 2005-07-07 | Hill Nicholas P.R. | Touch sensitive device employing bending wave vibration sensing and excitation transducers |
| CN1719397A (en) * | 2004-07-09 | 2006-01-11 | 义隆电子股份有限公司 | Capacity type contact control panel having integrated picture input function |
| CN1770084A (en) * | 2004-11-05 | 2006-05-10 | 北京北阳电子技术有限公司 | Touch signal input device and method, electronic apparatus therewith |
| CN1952863A (en) * | 2005-10-18 | 2007-04-25 | 鸿富锦精密工业（深圳）有限公司 | Touch type induction system |
-
2007
- 2007-06-01 CN CN2007101054901A patent/CN101315287B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5625382A (en) * | 1992-02-21 | 1997-04-29 | Mitsubishi Denki Kabushiki Kaisha | Display-integrated tablet |
| US20050146513A1 (en) * | 2003-12-31 | 2005-07-07 | Hill Nicholas P.R. | Touch sensitive device employing bending wave vibration sensing and excitation transducers |
| CN1719397A (en) * | 2004-07-09 | 2006-01-11 | 义隆电子股份有限公司 | Capacity type contact control panel having integrated picture input function |
| CN1770084A (en) * | 2004-11-05 | 2006-05-10 | 北京北阳电子技术有限公司 | Touch signal input device and method, electronic apparatus therewith |
| CN1952863A (en) * | 2005-10-18 | 2007-04-25 | 鸿富锦精密工业（深圳）有限公司 | Touch type induction system |
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Granted publication date: 20101215 Termination date: 20120601 |