CN102571058A - Touch key structure and touch device - Google Patents
Touch key structure and touch device Download PDFInfo
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- CN102571058A CN102571058A CN2011103370365A CN201110337036A CN102571058A CN 102571058 A CN102571058 A CN 102571058A CN 2011103370365 A CN2011103370365 A CN 2011103370365A CN 201110337036 A CN201110337036 A CN 201110337036A CN 102571058 A CN102571058 A CN 102571058A
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Abstract
The invention discloses a touch key structure and a touch device. The touch key structure comprises a metal touch panel, wherein a plurality of metal keys are arranged on the touch panel, the keys and the touch panel are isolated through an insulation layer, and the touch panel is ground; a detection board is arranged below the touch panel, a plurality of electrodes corresponding to the keys are arranged on the detection board, and the detection board and the touch panel are in insulation isolation; and areas between the plurality of keys and the electrodes form flat capacitors. The touch key structure and the touch device have better restraint effect of an induction range, and avoid the interference of adjacent keys during touch identification.
Description
Technical field
The present invention relates to the touch sensing technology, particularly touch key-press structure and touching device.
Background technology
At present, the consumption electronic product kind on the market more and more is tending towards variation, and the user requires also day by day to improve for the use experience of these consumption electronic products.And the key system in the consumption electronic product just becomes the wherein key factor that influences user's use experience.The traditional mechanical button is because the lofty attractive in appearance inadequately and difficult cleaning of outward appearance and being eliminated gradually, simultaneously the useful life of mechanical type button limited one of the reason that reduces user's use experience that also becomes.Therefore, gradually adopted the touch sensible button to substitute the traditional mechanical button on the market.Wherein, the design of capacitance type touch key also is that touch sensible is by a focus in the key technology.
The capacitance type touch key system that generally uses now all is to use the material of plastics as touch panel, and general containing metal composition not is in order to avoid cause the triggering of dislocation.Have the pcb board inductive disks under the said plastic front board,, just can trigger button, to realize touch control operation through touching the plastic front board directly over the pcb board inductive disks.Yet; For existing capacitance type touch key system; If panel material adopts metal material or panel material containing metal composition, then touch in any position of panel and all will trigger button, this just can't discern certain triggering once is to belong to which button; Thereby will cause the touch operation mistake, influence user's use.
Therefore, how in touch key system, to realize adopting the panel of metal material or containing metal composition, and reach the purpose of accurate recognizing touch operation, just become technical problem demanding prompt solution.
Summary of the invention
The present invention provides a kind of touch key-press structure and touching device that adopts the panel of metal material or containing metal composition, to improve the accuracy of touch recognition.
For addressing the above problem, the present invention also provides a kind of touch key-press structure, comprising:
The metal touch panel has a plurality of metal key-press on the said touch panel, isolate said touch panel ground connection between said button and said touch panel through insulating barrier;
Detecting plate under the said touch panel has a plurality of electrodes corresponding with key position on the said detecting plate, insulation is isolated between said detecting plate and said touch panel; Zone between said a plurality of button and counter electrode constitutes capacity plate antenna.
The present invention also provides a kind of touching device; Comprise above-mentioned touch key-press structure and controller, said touching device also comprises: controller, and said controller links to each other with each electrode on the said detecting plate; Detect electric charge transfer case on each electrode to obtain corresponding electric charge sample value; Said touch operation is discerned, and produced the output of identification control signal according to recognition result, said detection comprises:
When the touch key-press structure faced touch or closes on touch, the corresponding voltage of total amount of electric charge that record shifts from each electrode reached the number of times of reference voltage;
The number of times that reaches reference voltage with the corresponding voltage of total amount of electric charge that shifts on each electrode is as the electric charge sample value of said electrode corresponding key when said touch key-press structure faces touch or closes on touch;
The electric charge sample value is identified as the button that is touched less than the button of touch sensible threshold value.
Compared with prior art, above-mentioned touch key-press structure and touching device have the following advantages: through isolating through insulating barrier with metal touch panel ground connection and with a plurality of buttons on the metal touch panel, make said a plurality of button be able to mutual differentiation.And, because metal touch panel ground connection, have only when user's finger and just can trigger button by to metal key-press the time, do not have any response between adjacent two keys, the binding effect of induction range is also better, has avoided the interference of adjacent key when touch recognition.
And, when touch action takes place, calculate owing to touch the standard that the charge transfer quantity that produces is used as recognizing touch operation.Therefore, feasible more accurate for the touch recognition of touch action.
And above-mentioned touch recognition has realized the touch key-press structure of zero pressure in fact, has promoted user's use experience.
Description of drawings
Fig. 1 is the schematic top plan view of a kind of embodiment of touch key-press structure of the present invention;
Fig. 2 is the cross-sectional schematic of touch key-press structure shown in Figure 1 along the A-A direction;
Fig. 3 uses a kind of implementation procedure sketch map that touching device of the present invention carries out touch recognition;
Fig. 4 uses a kind of realization sketch map that touching device of the present invention carries out touch recognition;
Fig. 5 in touch recognition process shown in Figure 4, the simple and easy sketch map that the specific capacitance of electric charge in controller shifts.
Embodiment
Be elaborated for touch key-press structure and touch identification method respectively below in conjunction with embodiment and accompanying drawing.
In conjunction with illustrated in figures 1 and 2, a kind of embodiment of touch key-press structure of the present invention comprises:
Detecting plate under the said touch panel has a plurality of electrode A～Es corresponding with key position on the said detecting plate, 100 insulation of said detecting plate and said touch panel are isolated; Zone between said a plurality of button and counter electrode constitutes capacity plate antenna.
Among the embodiment of above-mentioned touch key-press structure, each button and metal touch panel are isolated, formed the independently a plurality of buttons in key position separately through insulating barrier.And through with metal touch panel ground connection, have only when user's finger and just can trigger button by to metal key-press the time, not having any response between adjacent two keys, the binding effect of induction range is also better.
And when user's finger touch was on metal key-press, electric charge will some be escaped through human body, and carried out electric charge via the corresponding electrode of metal key-press and shift, thereby shifted the touch recognition that realizes said metal key-press through detecting electric charge.This shows that above-mentioned press-key structure has been realized the touch key-press structure of zero pressure in fact, the user need not firmly to push said metal key-press just can be detected the touch behavior comparatively exactly, thereby has promoted user's use experience.
In concrete embodiment, the touch face of said metal key-press can be concordant with said metal touch panel, also can be higher or lower than said metal touch panel.
In concrete embodiment, said metal key-press and said metal touch panel can adopt commaterial, to practice thrift manufacturing cost and to optimize manufacturing process.For example, the material of said metal key-press and said metal touch panel all can be copper.When reality is made, can form the metal touch panel earlier, and size and the distribution of key position by each button punched on said metal touch panel, the pore size of punching should be greater than the size of each button.Subsequently, form each metal key-press again, and each metal key-press and metal touch panel are carried out fixing after the contraposition, fill insulant forms insulating barrier to isolate in the gap of each metal key-press and metal touch panel.
In concrete embodiment, each metal key-press can be the solid metal dish.The shape of then said solid metal dish can be for being fit to the shape of said press-key structure arbitrarily, and for example circle or square does not limit with this here.
In concrete embodiment, each metal key-press also can be metallic characters, and then said metal key-press can be realized touch detecting and the prompting keypress function simultaneously, need not on the metal touch panel silk-screen button character again again.
In concrete embodiment, the material of said insulating barrier can be glass, perhaps also can be other known various insulating material.Said electrode is a Copper Foil, perhaps also can be other known various electric conducting materials.
Need to prove that the button on the said metal touch panel 100 is 5 and is merely for example, do not tackle its implementation and limit.The number of said button and the distribution of function can be according to the touch function of the required realization of reality relative set.In other embodiment, the button on the said metal touch panel 100 can be 8,20 or more.
Correspondingly; A kind of embodiment of touching device of the present invention comprises: above-mentioned touch key-press structure and controller, and said controller links to each other with each electrode on the said detecting plate, and each electrode is charged; Detect electric charge transfer case on each electrode to obtain corresponding electric charge sample value; Said touch operation is discerned, and produced the output of identification control signal according to recognition result, said detection comprises:
The corresponding voltage of total amount of electric charge that record shifts from each electrode reaches the number of times of reference voltage;
The number of times that reaches reference voltage with the corresponding voltage of total amount of electric charge that shifts on each electrode is as the electric charge sample value of said electrode corresponding key when said touch key-press structure faces touch or closes on touch;
The electric charge sample value is identified as the button that is touched less than the button of touch sensible threshold value.
Said controller comprises: a plurality of specific capacitances, a plurality of voltage detecting and comparing unit, counting unit, discriminance analysis unit, output unit, wherein,
A plurality of specific capacitances, respectively with the touch key-press structure in each electrode pair should be connected;
A plurality of voltage detecting and comparing unit with the corresponding connection of said a plurality of specific capacitances, detect corresponding specific capacitance voltage respectively, when said specific capacitance voltage reaches reference voltage, and the output count signal;
Counting unit connects a plurality of voltage detecting and comparing unit, to the counting of the count signal of each voltage detecting and comparing unit output, and the count value of the count signal of each voltage detecting and comparing unit output is sent to the discriminance analysis unit;
The discriminance analysis unit faces in said touch key-press structure as each electrode corresponding key with the count value of the count signal of each voltage detecting and comparing unit output and to touch or close on the electric charge sample value when touching; The electric charge sample value is identified as the button that is touched less than the button of touch sensible threshold value; Said identifying information is sent to output unit;
Output unit produces identification control signal and output based on said identifying information.
With reference to shown in Figure 3, use the process that touching device of the present invention carries out touch recognition and comprise:
Step s1, when the touch key-press structure faced touch or closes on touch, the corresponding voltage of total amount of electric charge that record shifts from each electrode reached the number of times of reference voltage;
Step s2, the number of times that reaches reference voltage with the corresponding voltage of total amount of electric charge that shifts on each electrode is as the electric charge sample value of said electrode corresponding key when said touch key-press structure faces touch or closes on touch;
Step s3 is identified as the button that is touched with the electric charge sample value less than the button of touch sensible threshold value.
Wherein, Before carrying out said touch recognition; Also need carry out some initialization procedures, comprise: detection background ambient signal, the extraneous signal of shielding first frequency (being 80KHz in the present embodiment) to second frequency (being 120KHz in the present embodiment); Behind the signal in detecting said first frequency to second frequency scope, produce triggering signal.Said triggering signal triggers said touch recognition process.
Fig. 4 shows and uses a kind of realization sketch map that touching device of the present invention carries out touch recognition; In the touch key-press structure of said touching device; The material of metal touch panel and metal key-press is copper; The material of the insulating barrier between metal key-press and metal touch panel is a glass, and the electrode corresponding with key position is Copper Foil on the detecting plate.
When finger touch or close on when touching on the copper film a certain button, electric charge will some be escaped through human body, and produces electric charge via the corresponding Copper Foil of said key position and shift.For the situation of learning that said electric charge shifts, can adopt the means of voltage detecting.
With reference to shown in Figure 5, can each Copper Foil in the said touch key-press structure be linked to each other with said controller, include a plurality of specific capacitances in the said controller, each Copper Foil respectively with said controller in the corresponding connection of a specific capacitance.As aforementioned, when finger touch or close on when touching on the copper film a certain button, the electric charge of escaping from human body is understood some and is produced electric charge via said Copper Foil and shift.And because specific capacitance has existed with said Copper Foil and has been electrically connected, electric charge will shift by the specific capacitance in controller, and this process promptly is equivalent to the specific capacitance in the controller is charged.Because the voltage at electric capacity two ends is easy to record, therefore can detect the situation that electric charge shifts that obtains through voltage to the specific capacitance two ends.
Particularly, adopt the less specific capacitance of capacitance, can adopt the electric capacity of pF level usually, for example 0.5pF.Like this, specific capacitance is full of by the electric charge that shifts from Copper Foil with regard to being easier to.Based on this, through voltage detecting in the controller and comparing unit, the voltage (reference voltage) at two ends compared when the voltage at specific capacitance two ends and said specific capacitance were full of, and just can learn whether said specific capacitance is full of.Because finger touch or close on touches on the copper film in a certain button process, the electric charge that shifts via said Copper Foil possibly be full of required electric charge greater than specific capacitance, and a plurality of discharge circuits corresponding with specific capacitance quantity also can be set in controller.When voltage detecting in controller and comparing unit detected the specific capacitance voltage and reach reference voltage, said discharge circuit just started specific capacitance is discharged.Because the capacitance of specific capacitance is less, therefore also be easier to, and then the discharge required time seldom by said discharge circuit repid discharge.Thereby, can guarantee the accuracy of whole touch recognition process.After to the specific capacitance discharge, specific capacitance will be full of by the electric charge that shifts via Copper Foil again, will experience discharge once more subsequently again, and this process circulates until finger touch always or closes on the release that touches a certain button on the copper film.
Because voltage detecting and comparing unit can be exported count signal when the specific capacitance voltage reaches reference voltage, then at above-mentioned finger touch or close on touch action when finishing, voltage detecting and comparing unit will be exported a plurality of count signals.Based on this, just can record the count value of corresponding count signal through the counting unit in the controller, said count value just can be used as said touch key-press structure and faces the electric charge sample value that touches or close on respective keys when touching.
After obtaining the corresponding electric charge sample value of each button, just can analyze through the discriminance analysis unit in the controller, the electric charge sample value is identified as the button that is touched less than the button of touch sensible threshold value.Thereby, accomplish this touch recognition process.
In other embodiment of touching device of the present invention,, also comprise with respect to previous embodiment:
Be positioned at the light source of a plurality of buttons below, said light source links to each other with controller;
The material of said insulating barrier is a transparent insulation material;
Said controller less than near the induction threshold value and greater than the touch sensible threshold value time, is opened said light source in the corresponding electric charge sample value of each button.
Among the embodiment of said touching device; Owing to below button, set up light source; When controller detects the corresponding electric charge sample value of a certain button less than near the induction threshold value and greater than the touch sensible threshold value time, actual situation about taking place be user's finger near said touch key-press structure, open light source through controller this moment and just can make the user in the environment of dark, see each button clearly; Strengthen user's operating experience, further improved user's use experience.
In addition, after said controller is being discerned the button that obtains to be touched, can also lighten the light source of the said button below that is touched; Thereby when the user touches certain button; Can the light at this place, key position is brighter, with the prompting button, make user's operating experience further obtain to strengthen.
Below for above-mentioned user finger during near touch key-press structure and touch key-press corresponding process of carrying out light source control further specify.Describe for convenient, user's finger is defined as near sense events near the corresponding situation of touch key-press structure triggers, situation corresponding during with user's finger touch button is defined as the touch sensible Event triggered.
Specifically, when user finger during near a certain button of said metal touch panel, electric charge will some be escaped through human body.And this moment, said controller will detect consequent electric charge transfer case, obtains the number of times that the corresponding specific capacitance of this button is filled, and the said number of times that is filled is pointed near the electric charge sample value in the process as the user.Thereby said controller just can carry out the judgement near sense events.Usually, accurate near the judgement of sense events for making, said controller can be judged based on a plurality of electric charge sample datas, to obtain result of determination.
For example, the electric charge sample value of continuous 8 acquisitions satisfies:
T
th＜CS＜P
th (1)
Then, said controller is judged near the sense events triggering, is carried out the operation of above-mentioned unlatching light source.Wherein, CS is the electric charge sample value of each time, P
ThBe near induction threshold value, T
ThIt is the touch sensible threshold value.Saidly can in the discriminance analysis unit of controller, be provided with in advance near induction threshold value and touch sensible threshold value, its value can be through setting up an initial value, and through repeatedly coming final definite near sense events/touch sensible incident test.
Certainly, not merely be that the user points near the touch key-press structure owing to causing the reason that electric charge changes in the above-mentioned charge accumulation area, possibly also have the influence of other environmental interference.In order to obtain result of determination more accurately, can comprehensively judge more frequently come final obtain near the triggering of sense events whether corresponding the situation of user's finger near the touch key-press structure.For example; The electric charge sample value of aforementioned continuous 8 acquisitions is satisfied the back result of determination that obtains of formula (1) as the preliminary judgement result;, continuous 5 times preliminary judgement result triggers the situation of user's finger that then definite triggering near sense events is corresponding if all showing near sense events near the touch key-press structure.At this moment, open the light source that is positioned at a plurality of buttons below by said controller, so that the user sees each button clearly in the environment of dark.And it is follow-up in order to guarantee to the accuracy of user's finger to the touch recognition of button; Said controller can stop the detection to the electric charge transfer case; Promptly forbid the induction channels that the metal touch panel is corresponding; So that the current potential of metal decking is reattached to earthing potential, guarantee that keypress function normally uses.
When the user points continuation near the metal touch panel during until one or more button of finally touching on the metal decking, said controller can carry out corresponding touch recognition, after identification obtains to be touched button, lightens the light source of the said button below that is touched.Similar near sense events with aforementioned judgement, for making the judgement of touch sensible incident accurate, said controller also can be judged based on a plurality of electric charge sample value data, to obtain result of determination.
For example, the electric charge sample value of continuous 8 acquisitions satisfies:
CS＜T
th (2)
Then, said controller is judged the touch sensible Event triggered, lightens the operation of the light source of the said button below that is touched.Wherein, CS still representes the electric charge sample value of each time, T
ThStill represent the touch sensible threshold value.
Further, in order to obtain result of determination more accurately, the situation of the said touch key-press structure of user's finger touch that comprehensively whether the triggering of the next final acquisition touch sensible incident of judgement more frequently is corresponding.For example; The electric charge sample value of aforementioned continuous 8 acquisitions is satisfied the back result of determination that obtains of formula (2) as the preliminary judgement result; If continuous 5 times preliminary judgement result all shows the touch sensible Event triggered, the situation of the said touch key-press structure of user's finger touch that then triggering of definite touch sensible incident is corresponding.
When touch accomplishing, user's finger is during gradually away from said touch key-press structure, and electric charge sample value (CS) also begins slowly to raise.When the electric charge sample value satisfies:
CS >=(Tth+LTA) * 75% o'clock,
Then, said controller judges that touch sensible stops, and recovers the brightness before the said light source that is touched the button below lightens.Wherein, when LTA (Long Term Average) expression does not trigger any condition, the long-term average of said electric charge sample value.And the parameter 75% when judging also can be adjusted to other numerical value, for example 87.5%, and mainly look environment the noise effect of said touch key-press structure is decided.
Along with the said further away from each other touch key-press structure of user's finger, the electric charge sample value continues to raise, when the electric charge sample value satisfies:
CS >=(Pth+LTA) * 75% o'clock,
Then, said controller judges near induction and also stops, and closes the light source of all buttons belows, is in the said electric charge sample value of monitoring again and correspondingly opens or lighten light source according to above-mentioned trigger condition.
More than disclose many aspects of the present invention and execution mode, it will be understood by those skilled in the art that others of the present invention and execution mode.Disclosed many aspects and execution mode just are used to illustrate among the present invention, are not to be to qualification of the present invention, and real protection range of the present invention and spirit should be as the criterion with claims.
Claims (12)
1. a touch key-press structure is characterized in that, comprising:
The metal touch panel has a plurality of metal key-press on the said touch panel, isolate said touch panel ground connection between said button and said touch panel through insulating barrier;
Detecting plate under the said touch panel has a plurality of electrodes corresponding with key position on the said detecting plate, insulation is isolated between said detecting plate and said touch panel; Zone between said a plurality of button and counter electrode constitutes capacity plate antenna.
2. touch key-press structure as claimed in claim 1 is characterized in that the touch face of said button is concordant with said touch panel.
3. touch key-press structure as claimed in claim 1 is characterized in that the touch face of said button is higher or lower than said touch panel.
4. touch key-press structure as claimed in claim 1 is characterized in that, said button is the solid metal dish.
5. touch key-press structure as claimed in claim 4 is characterized in that, said button is circular or square.
6. touch key-press structure as claimed in claim 1 is characterized in that, said button is a metallic characters.
7. touch key-press structure as claimed in claim 1 is characterized in that, said electrode is a Copper Foil.
8. touch key-press structure as claimed in claim 1 is characterized in that the material of said touch panel and said button is copper.
9. touching device that comprises each described touch key-press structure of claim 1 to 8; Wherein, said touching device also comprises: controller, and said controller links to each other with each electrode on the said detecting plate; Detect electric charge transfer case on each electrode to obtain corresponding electric charge sample value; Said touch operation is discerned, and produced the output of identification control signal according to recognition result, said detection comprises:
When the touch key-press structure faced touch or closes on touch, the corresponding voltage of total amount of electric charge that record shifts from each electrode reached the number of times of reference voltage;
The number of times that reaches reference voltage with the corresponding voltage of total amount of electric charge that shifts on each electrode is as the electric charge sample value of said electrode corresponding key when said touch key-press structure faces touch or closes on touch;
The electric charge sample value is identified as the button that is touched less than the button of touch sensible threshold value.
10. touching device as claimed in claim 9, wherein, said controller comprises: a plurality of specific capacitances, a plurality of voltage detecting and comparing unit, counting unit, discriminance analysis unit, output unit, wherein,
A plurality of specific capacitances, respectively with the touch key-press structure in each electrode pair should be connected;
A plurality of voltage detecting and comparing unit with the corresponding connection of said a plurality of specific capacitances, detect corresponding specific capacitance voltage respectively, when said specific capacitance voltage reaches reference voltage, and the output count signal;
Counting unit connects a plurality of voltage detecting and comparing unit, to the count signal counting of each voltage detecting and comparing unit output, and the count value of the count signal of each voltage detecting and comparing unit output is sent to the discriminance analysis unit;
The discriminance analysis unit faces in said touch key-press structure as each electrode corresponding key with the count value of the count signal of each voltage detecting and comparing unit output and to touch or close on the electric charge sample value when touching; The electric charge sample value is identified as the button that is touched less than the button of touch sensible threshold value; Said identifying information is sent to output unit;
Output unit produces identification control signal and output based on said identifying information.
11. like claim 9 or 10 described touching devices, wherein, also comprise: be positioned at the light source of a plurality of buttons below, said light source links to each other with controller;
The material of said insulating barrier is a transparent insulation material;
Said controller less than near the induction threshold value and greater than the touch sensible threshold value time, is opened the said light source of said button below in the corresponding electric charge sample value of each button.
12. touching device as claimed in claim 11, wherein, said controller lightens the light source of the said button below that is touched after identification obtains to be touched button.
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| CN104218935A (en) * | 2014-08-15 | 2014-12-17 | 上海新时达电气股份有限公司 | Integrated capacitive-sensing key panel and key recognition method thereof |
| CN104682941A (en) * | 2014-07-08 | 2015-06-03 | 广东美的厨房电器制造有限公司 | Metal plate touch key component |
| CN105409125A (en) * | 2013-07-15 | 2016-03-16 | 伊莱克斯家用电器股份公司 | A touch switch for a control device of an electric and/or electronic apparatus |
| CN109445630A (en) * | 2018-10-19 | 2019-03-08 | 李扬渊 | Touch key-press panel and touch key-press method |
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Application publication date: 20120711 |