CN202815747U - Touch pen for capacitance screen - Google Patents
Touch pen for capacitance screen Download PDFInfo
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- CN202815747U CN202815747U CN201220438952.8U CN201220438952U CN202815747U CN 202815747 U CN202815747 U CN 202815747U CN 201220438952 U CN201220438952 U CN 201220438952U CN 202815747 U CN202815747 U CN 202815747U
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Abstract
The utility model relates to the technical field of a touch pen and provides the touch pen for a capacitance screen. The touch pen comprises a pen main body, a nib electrode and an inductive electrode, wherein the nib electrode and the inductive electrode are arranged in the pen main body; the touch pen further comprises an elastic pad and a pressure detecting circuit; the elastic pad is arranged between the nib electrode and the inductive electrode; the nib electrode and the inductive electrode are fixedly connected through the elastic pad; when the nib electrode is stressed, the elastic pad is simultaneously stressed and deformed; and the pressure detecting circuit is used for detecting a capacitance between the nib electrode and the inductive electrode and converting the capacitance into a pressure index suffered by the nib electrode. A capacitance detecting principle is adopted by the touch pen, so that the detection for the pressure endured by the touch pen for the capacitance screen during the touch operation process is realized, the scheme is simple and reliable, the sensitivity is high and the user experience is true.
Description
Technical field
The utility model relates to the felt pen technical field, particularly relates to a kind of capacitance plate felt pen.
Background technology
Along with the development of touching technique and portable terminal technology, increasing portable terminal adopts touch manner to carry out man-machine interaction.At present the touch-screen that adopts of portable terminal mainly contains two kinds of capacitive touch screen and resistive touch screens, and wherein capacitive touch screen has obtained more and more users' favor with its good sharpness, transmittance and sense of touch.Portable terminal is at present most widely used to be mobile phone and panel computer.
Capacitive touch screen is except can with the direct touch operation of finger, carrying out touch operation by capacitance plate felt pen replacing finger.If will reaching reasonable user, the capacitance plate felt pen experiences, just must be the same with real pen, produce the effect of handwriting thickness according to hand-written firmly size.Thus, in the design of capacitance plate felt pen, just need to add pressure detecting function.
There is at present several different methods can realize pressure detection, such as passing through Photoelectric Detection, piezoelectric detection and pressure resistance detection etc.But such scheme all needs special sensor could realize that cost is higher, and volume is also larger.
The utility model content
The utility model provides a kind of capacitance plate felt pen for the defects of prior art, adopts the capacitance detecting principle, when realizing touch operation the suffered pressure of capacitance plate felt pen is detected, and scheme is simple and reliable, and is highly sensitive, and the user experiences truly.
The technical solution adopted in the utility model is:
A kind of capacitance plate felt pen, described felt pen comprises a body, nib electrode and induction electrode, described nib electrode and induction electrode are arranged in the body, described felt pen also comprises elastomeric pad and pressure detection circuit, described elastomeric pad is arranged between nib electrode and the induction electrode, the nib electrode is fixedly connected with by elastomeric pad with induction electrode, when described nib electrode is stressed, make simultaneously stressed generation deformation of elastomeric pad, described pressure detection circuit detects the electric capacity between nib electrode and the induction electrode, and described electric capacity is converted to the suffered pressure index of nib electrode.
Preferably, described body comprises nib and a body, and described nib electrode is arranged in the nib, and described induction electrode is arranged in the body, described elastomeric pad is arranged in the body, is provided with a nib electrode channel that supplies the nib electrode to move through between described nib and the body.
Preferably, the shape of described nib electrode channel is similar with the cross sectional shape of the nib electrode part that moves through described nib electrode channel.
Preferably, described pressure detection circuit comprises integrating circuit, sample circuit, pen point pressure quantification of targets module and pressure data output module, one pumping signal is connected with the nib electrode, described nib electrode and induction electrode coupling, described induction electrode is connected with the pressure data output module and is connected with integrating circuit, sample circuit, pen point pressure quantification of targets module:
Produce mutual coupling electric capacity between nib electrode and the induction electrode;
Integrating circuit is with described mutual coupling capacitance signal amplitude integration, and inhibition noise amplitude;
Sample circuit is sampled as digital signal by analog to digital converter with simulating signal;
Pen point pressure quantification of targets module is carried out computing according to described digital signal, obtains pressure index;
The pressure data output module is exported described pressure index.
In another embodiment of the present invention, described pressure detection circuit comprises pre-amplifier, bandpass filter, synchronous demodulation circuit, low-pass filter, integrating circuit, sample circuit, pen point pressure quantification of targets module and pressure data output module, one pumping signal is connected with the nib electrode, described nib electrode and induction electrode coupling, described induction electrode is connected with the pressure data output module and is connected with pre-amplifier, bandpass filter, synchronous demodulation circuit, low-pass filter, integrating circuit, sample circuit, pen point pressure quantification of targets module:
Produce mutual coupling electric capacity between nib electrode and the induction electrode;
Described mutual coupling electric capacity is carried out impedance transformation with pre-amplifier and signal amplifies, and catches feeble signal;
The noise that bandpass filter filtered signal bandwidth range is outer improves signal to noise ratio (S/N ratio);
Synchronous demodulation circuit modulates the signal relevant with pumping signal;
The noise that the low pass filter filters out unrelated signal is modulated out;
Integrating circuit is with the signal amplitude integration, and inhibition noise amplitude;
Sample circuit is sampled as digital signal by analog to digital converter with simulating signal;
Pen point pressure quantification of targets module is carried out computing according to described digital signal, obtains pressure index;
The pressure data output module is exported described pressure index.
Preferably, described pumping signal is provided by the nib signal source.
Preferably, the sample circuit in the described pressure detection circuit, pen point pressure quantification of targets module and pressure data output module are integrated in the chip, and other parts in the pressure detection circuit are arranged on the circuit board; Perhaps described pressure detection circuit all is integrated in the chip.
Preferably, described elastomeric pad is made by non-conducting material.
Preferably, described elastomeric pad is rubber blanket.
Preferably, the cross sectional shape of described elastomeric pad is circular, and the thickness range of elastomeric pad is 0.1～3mm, and the deformation distance range that the normal pressure the when people uses described felt pen causes for described elastomeric pad is 0.05～0.3mm.
The utility model is by arranging elastomeric pad between nib electrode and induction electrode, the Main Function of elastomeric pad is stress and deformation, with the nib electrode, induction electrode forms a pressure transducer together, when felt pen is stressed because elastomeric pad deformation, change of distance between nib electrode and the induction electrode, cause capacitance variations between the two, and the variable quantity of distance and the nib electrode pressure relation of being in proportion, so also proportional relation of the variable quantity of electric capacity and nib electrode pressure size.Detect electric capacity between nib electrode and the induction electrode by pressure detection circuit, and electric capacity is converted to the suffered pressure index of nib electrode, its pressure index is also different under different stressing conditions.The utility model adopts the capacitance detecting principle, when realizing touch operation the suffered pressure of capacitance plate felt pen is detected, and scheme is simple and reliable, and is highly sensitive, and the user experiences truly.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1 capacitance plate felt pen without pressure the time;
Fig. 2 is the structural representation of the utility model embodiment 1 capacitance plate felt pen when being stressed;
Fig. 3 is the pressure detection circuit block diagram in the utility model embodiment 1 capacitance plate felt pen;
Fig. 4 is the pressure detection circuit block diagram in the utility model embodiment 2 capacitance plate felt pens.
Illustration:
1 body, 11 nibs,
12 bodies, 13 nib electrode channels,
2 nib electrodes, 3 induction electrodes,
4 elastomeric pads, 5 pressure detection circuits,
51 pre-amplifiers, 52 bandpass filter,
53 synchronous demodulation circuits, 54 low-pass filters,
55 integrating circuit, 56 sample circuits,
57 pen point pressure quantification of targets modules, 58 pressure data output modules.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The utility model embodiment provides a kind of capacitance plate felt pen, this felt pen comprises a body, nib electrode and induction electrode, nib electrode and induction electrode are arranged in the body, this felt pen also comprises elastomeric pad and pressure detection circuit, elastomeric pad is arranged between nib electrode and the induction electrode, the nib electrode is fixedly connected with by elastomeric pad with induction electrode, when the nib electrode is stressed, make simultaneously stressed generation deformation of elastomeric pad, pressure detection circuit detects the electric capacity between nib electrode and the induction electrode, and electric capacity is converted to the suffered pressure index of nib electrode.
The utility model embodiment adopts the capacitance detecting principle, when realizing touch operation the suffered pressure of capacitance plate felt pen is detected, and scheme is simple and reliable, and is highly sensitive, and the user experiences truly.
Embodiment 1:
See also illustrated in figures 1 and 2ly, Fig. 1 is the structural representation of the utility model embodiment 1 capacitance plate felt pen without pressure the time, and Fig. 2 is the structural representation of the utility model embodiment 1 capacitance plate felt pen when being stressed.This capacitance plate felt pen comprises a body 1, nib electrode 2, induction electrode 3, elastomeric pad 4 and pressure detection circuit 5.
Please consult simultaneously shown in Figure 3, Fig. 3 is the pressure detection circuit block diagram in the utility model embodiment 1 capacitance plate felt pen, pressure detection circuit 5 detects the capacitor C between nib electrodes 2 and the induction electrode 3, and electric capacity is converted to the suffered pressure index F of nib electrode 2.In the present embodiment, pressure detection circuit 5 comprises integrating circuit 55, sample circuit 56, pen point pressure quantification of targets module 57 and pressure data output module 58.Present embodiment is to adopt mutual capacitance type to come detected pressures electric capacity, therefore need pumping signal, one pumping signal is connected with nib electrode 2, this pumping signal is the nib signal, provided by the nib signal source, nib electrode 2 and induction electrode 3 couplings, induction electrode 3 and integrating circuit 55, sample circuit 56, pen point pressure quantification of targets module 57 are connected with the pressure data output module and are connected successively.Producing mutual coupling electric capacity between nib electrode 2 and the induction electrode 3, also is testing pressure electric capacity; Integrating circuit 55 is with mutual coupling capacitance signal amplitude integration, and inhibition noise amplitude; Sample circuit 56 is sampled as digital signal by analog to digital converter with simulating signal; Pen point pressure quantification of targets module 57 is carried out computing according to digital signal, obtains pressure index; Pressure data output module 58 output pressure indexs.Sample circuit 56 in the pressure detection circuit 5, pen point pressure quantification of targets module 57 and pressure data output module 58 can be integrated in the chip, and other parts in the pressure detection circuit 5 are arranged on the circuit board; Perhaps all parts of pressure detection circuit 5 all being integrated into also is feasible in the chip.
Detailed process by the capacitor C calculating pressure index F that detects is:
The computing formula of the capacitor C between nib electrode and the induction electrode is: C=ε S/4 П k
1d
xTherefore, between nib electrode and the induction electrode apart from d
xComputing formula (1) be:
d
x＝εS/4Пk
1C； (1)
Wherein, d
xBe the distance between nib electrode and the induction electrode, ε is the specific inductive capacity of medium between nib electrode and the induction electrode, S be nib electrode and induction electrode over against area, k
1Be the electrostatic force constant, C is the electric capacity between nib electrode and the induction electrode; ε, S and k
1Be constant, d
xWith C be variable, between nib electrode and the induction electrode apart from d
xVariation, cause the capacitance variations between nib electrode and the induction electrode.
The computing formula (2) of the pressure index F that the nib electrode is suffered is:
F＝(d-d
0)/((d
1-d
0)/256)； (2)
Wherein, d is the distance between nib electrode and the induction electrode under the current pressure, d
0Distance for without pressure the time between nib electrode and the induction electrode, d
1Distance during for maximum pressure between nib electrode and the induction electrode, 256 pressure index ranks when representing maximum pressure are 256 grades; d
0And d
1Be constant, F and d are variable.
After detecting C, with C substitution formula (1), by d, d0 and the d1 in formula (1) computing formula (2), with d, the d0 and the d1 substitution formula (2) that calculate, can try to achieve the pressure index F under the current pressure again.Like this, can realize the detection of multistage pressure level.
The utility model embodiment is by arranging elastomeric pad between nib electrode and induction electrode, the Main Function of elastomeric pad is stress and deformation, with the nib electrode, induction electrode forms a pressure transducer together, when felt pen is stressed because elastomeric pad deformation, change of distance between nib electrode and the induction electrode, cause capacitance variations between the two, and the variable quantity of distance and the nib electrode pressure relation of being in proportion, so also proportional relation of the variable quantity of electric capacity and nib electrode pressure size.Detect electric capacity between nib electrode and the induction electrode by pressure detection circuit, and electric capacity is converted to the suffered pressure index of nib electrode, its pressure index is also different under different stressing conditions.The utility model embodiment adopts the capacitance detecting principle, when realizing touch operation the suffered pressure of capacitance plate felt pen is detected, scheme is simple and reliable, highly sensitive, the user experiences truly, can reach in use the effect that the foundation hand-written firmly size the same with true pen produces handwriting thickness.
Embodiment 2:
The difference of present embodiment and embodiment 1 is the composition of pressure detection circuit 5.Present embodiment and embodiment 1 identical part repeats no more herein, only describes different parts.
See also shown in Figure 4ly, Fig. 4 is the pressure detection circuit block diagram in the utility model embodiment 2 capacitance plate felt pens.This pressure detection circuit 5 comprises pre-amplifier 51, bandpass filter 52, synchronous demodulation circuit 53, low-pass filter 54, integrating circuit 55, sample circuit 56, pen point pressure quantification of targets module 57 and pressure data output module 58.Present embodiment is to adopt mutual capacitance type to come detected pressures electric capacity, therefore need pumping signal, one pumping signal is connected with nib electrode 2, this pumping signal is the nib signal, provided by the nib signal source, nib electrode 2 and induction electrode 3 couplings, induction electrode 2 and pre-amplifier 51, bandpass filter 52, synchronous demodulation circuit 53, low-pass filter 54, integrating circuit 55, sample circuit 56, pen point pressure quantification of targets module 57 are connected with the pressure data output module and are connected successively.Produce mutual coupling electric capacity between nib electrode 2 and the induction electrode 3; Mutual coupling electric capacity is carried out impedance transformation with pre-amplifier 51 and signal amplifies, and catches feeble signal; The noise that bandpass filter 52 filtered signal bandwidth ranges are outer improves signal to noise ratio (S/N ratio); Synchronous demodulation circuit 53 modulates the signal relevant with pumping signal; The noise that low-pass filter 54 filtering unrelated signals are modulated out; Integrating circuit 55 is with the signal amplitude integration, and inhibition noise amplitude; Sample circuit 56 is sampled as digital signal by analog to digital converter with simulating signal; Pen point pressure quantification of targets module 57 is carried out computing according to digital signal, obtains pressure index; Pressure data output module 58 output pressure indexs.
The pressure detection circuit 5 of present embodiment is on the basis of embodiment 1, pre-amplifier 51, bandpass filter 52, synchronous demodulation circuit 53 and low-pass filter 54 have been increased, circuit is optimized, make the signal capture of whole pressure detection circuit 5 sensitiveer, with the noise signal filtering, improved signal to noise ratio (S/N ratio).
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. capacitance plate felt pen, described felt pen comprises a body, nib electrode and induction electrode, described nib electrode and induction electrode are arranged in the body, it is characterized in that, described felt pen also comprises elastomeric pad and pressure detection circuit, described elastomeric pad is arranged between nib electrode and the induction electrode, the nib electrode is fixedly connected with by elastomeric pad with induction electrode, when described nib electrode is stressed, make simultaneously stressed generation deformation of elastomeric pad, described pressure detection circuit detects the electric capacity between nib electrode and the induction electrode, and described electric capacity is converted to the suffered pressure index of nib electrode.
2. felt pen according to claim 1, it is characterized in that, described body comprises nib and a body, described nib electrode is arranged in the nib, described induction electrode is arranged in the body, described elastomeric pad is arranged in the body, is provided with a nib electrode channel that supplies the nib electrode to move through between described nib and the body.
3. felt pen according to claim 2 is characterized in that, the shape of described nib electrode channel is similar with the cross sectional shape of the nib electrode part that moves through described nib electrode channel.
4. felt pen according to claim 1, it is characterized in that, described pressure detection circuit comprises integrating circuit, sample circuit, pen point pressure quantification of targets module and pressure data output module, one pumping signal is connected with the nib electrode, described nib electrode and induction electrode coupling, described induction electrode is connected with the pressure data output module and is connected with integrating circuit, sample circuit, pen point pressure quantification of targets module:
Produce mutual coupling electric capacity between nib electrode and the induction electrode;
Integrating circuit is with described mutual coupling capacitance signal amplitude integration, and inhibition noise amplitude;
Sample circuit is sampled as digital signal by analog to digital converter with simulating signal;
Pen point pressure quantification of targets module is carried out computing according to described digital signal, obtains pressure index;
The pressure data output module is exported described pressure index.
5. felt pen according to claim 1, it is characterized in that, described pressure detection circuit comprises pre-amplifier, bandpass filter, synchronous demodulation circuit, low-pass filter, integrating circuit, sample circuit, pen point pressure quantification of targets module and pressure data output module, one pumping signal is connected with the nib electrode, described nib electrode and induction electrode coupling, described induction electrode and pre-amplifier, bandpass filter, synchronous demodulation circuit, low-pass filter, integrating circuit, sample circuit, pen point pressure quantification of targets module is connected with the pressure data output module and is connected:
Produce mutual coupling electric capacity between nib electrode and the induction electrode;
Described mutual coupling electric capacity is carried out impedance transformation with pre-amplifier and signal amplifies, and catches feeble signal;
The noise that bandpass filter filtered signal bandwidth range is outer improves signal to noise ratio (S/N ratio);
Synchronous demodulation circuit modulates the signal relevant with pumping signal;
The noise that the low pass filter filters out unrelated signal is modulated out;
Integrating circuit is with the signal amplitude integration, and inhibition noise amplitude;
Sample circuit is sampled as digital signal by analog to digital converter with simulating signal;
Pen point pressure quantification of targets module is carried out computing according to described digital signal, obtains pressure index;
The pressure data output module is exported described pressure index.
6. according to claim 4 or 5 described felt pens, it is characterized in that described pumping signal is provided by the nib signal source.
7. according to claim 4 or 5 described felt pens, it is characterized in that, sample circuit in the described pressure detection circuit, pen point pressure quantification of targets module and pressure data output module are integrated in the chip, and other parts in the pressure detection circuit are arranged on the circuit board; Perhaps described pressure detection circuit all is integrated in the chip.
8. felt pen according to claim 1 is characterized in that, described elastomeric pad is made by non-conducting material.
9. according to claim 1 or 8 described felt pens, it is characterized in that described elastomeric pad is rubber blanket.
10. felt pen according to claim 9, it is characterized in that, the cross sectional shape of described elastomeric pad is circular, and the thickness range of elastomeric pad is 0.1～3mm, and the deformation distance range that the normal pressure the when people uses described felt pen causes for described elastomeric pad is 0.05～0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220438952.8U CN202815747U (en) | 2012-08-31 | 2012-08-31 | Touch pen for capacitance screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220438952.8U CN202815747U (en) | 2012-08-31 | 2012-08-31 | Touch pen for capacitance screen |
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| Publication Number | Publication Date |
|---|---|
| CN202815747U true CN202815747U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220438952.8U Expired - Lifetime CN202815747U (en) | 2012-08-31 | 2012-08-31 | Touch pen for capacitance screen |
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| CN (1) | CN202815747U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104915027A (en) * | 2014-03-14 | 2015-09-16 | 义隆电子股份有限公司 | Capacitive touch control pen |
| CN106249922A (en) * | 2016-08-12 | 2016-12-21 | 京东方科技集团股份有限公司 | A kind of pointer |
| CN107861651A (en) * | 2016-09-22 | 2018-03-30 | 京东方科技集团股份有限公司 | Touch control method, active pen, touch-screen and touch control display system |
| WO2018094602A1 (en) * | 2016-11-23 | 2018-05-31 | 深圳市汇顶科技股份有限公司 | Method, device and equipment for detecting pressure |
| CN110456925A (en) * | 2019-08-05 | 2019-11-15 | 深圳市千分一智能技术有限公司 | A kind of pressure sensor module and active pen of active capacitance pen |
| CN111240499A (en) * | 2020-01-02 | 2020-06-05 | 深圳市千分一智能技术有限公司 | Micro pressure detection method of active pen and active pen |
| CN111373357A (en) * | 2017-11-29 | 2020-07-03 | 株式会社和冠 | Communication method performed between active pen and sensor controller and active pen |
-
2012
- 2012-08-31 CN CN201220438952.8U patent/CN202815747U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104915027A (en) * | 2014-03-14 | 2015-09-16 | 义隆电子股份有限公司 | Capacitive touch control pen |
| CN106249922A (en) * | 2016-08-12 | 2016-12-21 | 京东方科技集团股份有限公司 | A kind of pointer |
| CN107861651A (en) * | 2016-09-22 | 2018-03-30 | 京东方科技集团股份有限公司 | Touch control method, active pen, touch-screen and touch control display system |
| US10481718B2 (en) | 2016-09-22 | 2019-11-19 | Boe Technology Group Co., Ltd. | Touch control method for touch panel, touch panel, active stylus for touch panel, and touch display apparatus including touch panel |
| WO2018094602A1 (en) * | 2016-11-23 | 2018-05-31 | 深圳市汇顶科技股份有限公司 | Method, device and equipment for detecting pressure |
| US10534469B2 (en) | 2016-11-23 | 2020-01-14 | Shenzhen GOODIX Technology Co., Ltd. | Force detection method, apparatus and device |
| CN111373357A (en) * | 2017-11-29 | 2020-07-03 | 株式会社和冠 | Communication method performed between active pen and sensor controller and active pen |
| CN111373357B (en) * | 2017-11-29 | 2023-09-22 | 株式会社和冠 | Communication method executed between active pen and sensor controller and active pen |
| CN110456925A (en) * | 2019-08-05 | 2019-11-15 | 深圳市千分一智能技术有限公司 | A kind of pressure sensor module and active pen of active capacitance pen |
| CN111240499A (en) * | 2020-01-02 | 2020-06-05 | 深圳市千分一智能技术有限公司 | Micro pressure detection method of active pen and active pen |
| CN111240499B (en) * | 2020-01-02 | 2023-07-28 | 深圳市千分一智能技术有限公司 | Micro pressure detection method of active pen and active pen |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN GOODIX TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHENZHEN GOODIX TECHNOLOGY LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 13 floor, block B, Futian Free Trade Zone, Shenzhen, Guangdong, China, Patentee after: SHENZHEN GOODIX TECHNOLOGY Co.,Ltd. Address before: 13 floor, block B, Futian Free Trade Zone, Shenzhen, Guangdong, China, Patentee before: SHENZHEN GOODIX TECHNOLOGY Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130320 |
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| CX01 | Expiry of patent term |