CN102566792A - Antenna loop scanning method during coordinate calculation process of electromagnetic induction system - Google Patents
Antenna loop scanning method during coordinate calculation process of electromagnetic induction system Download PDFInfo
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- CN102566792A CN102566792A CN2010106128814A CN201010612881A CN102566792A CN 102566792 A CN102566792 A CN 102566792A CN 2010106128814 A CN2010106128814 A CN 2010106128814A CN 201010612881 A CN201010612881 A CN 201010612881A CN 102566792 A CN102566792 A CN 102566792A
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Abstract
The invention discloses an antenna loop scanning method during the coordinate calculation process of an electromagnetic induction system. According to the antenna loop scanning method disclosed by the invention, which antenna loops need to be subject to scanning procedures in all the scanning procedures can be decided in a simplest way. The antenna loop scanning method comprises the following steps of: firstly scanning a plurality of the antenna loops in an all region of an antenna board when the first scanning procedure is performed; then performing the second scanning procedure after getting the address of the antenna loop with a maximum signal, wherein the scanning is only performed on the antenna loop with the maximum signal and the two antenna loops which are respectively arranged on the left and the right of the antenna loop with the maximum signal in the second scanning procedure; and then deciding whether the third scanning procedure is performed or not according to preset conditions, wherein the scanning is only performed on the single antenna loop when the third scanning procedure is performed. In the process, voltage signal values of the three antenna loops are taken for calculating coordinates according to the preset conditions; and by adopting the method disclosed by the invention, the scanning time during the coordinate positioning process and the power consumption during the operation of the system can be reduced.
Description
Technical field
The present invention relates to the technical field of the antenna loop scan method in the EM induction system; Can be with the scanning sequence of simplifying most; Obtain three the strongest antenna loops of signal intensity and carry out Coordinate Calculation, particularly relate to the antenna loop scan method in a kind of coordinates computed process of EM induction system.
Background technology
At present in the electromagnetic type induction system; The design of antenna plate is that a plurality of antenna loops are arranged in grid network with X, Y array axis mode equidistance; When with an inductive electromagnetic index equipment near or when touching this antenna plate; Because intensity and the square distance in magnetic field are inversely proportional to, the electromagnetism pointing device of launching electromagnetic field is far away more apart from antenna plate, can make antenna loop receives on the antenna plate signal more a little less than; Relatively, when the electromagnetism pointing device was nearer apart from antenna loop, the signal that can make antenna loop receive was strong more.Therefore, as long as during near antenna plate, scan all antenna loops at the electromagnetism pointing device one by one, it is strong and weak to analyze the received signal of each antenna loop, can learn just which antenna loop address the electromagnetism pointing device is positioned at, and then can learn its coordinate through calculating.
At present the coordinate location method of electromagnetic type induction system mainly is to carry out repeatedly scanning sequence in antenna plate, for example: the electromagnetism index equipment near the time; Carry out the scanning sequence of region-wide all antenna loops earlier; After calculating relatively, carry out the only scanning sequence of several antenna loops of regional area again, also can judge the scanning sequence that whether will carry out region-wide or regional area again according to the signal power in the process; At last when carrying out coordinate setting; Only can get three voltage signal values, cooperate corresponding antenna loop address, calculate the place coordinate position.
As shown in Figure 1, be the synoptic diagram of the antenna loop scanning flow process of existing EM induction system.The steps include: to carry out at first earlier the region-wide scanning sequence 110 of antenna plate; Be that all antenna loops on the antenna plate are scanned at this moment; After obtaining the antenna loop address of maximum voltage signal value, the antenna loop address is that benchmark carries out 1/2 sector scanning program 120 according to this; After carrying out 1/2 sector scanning program 120, obtain the antenna loop address of maximum voltage signal value by central data again after, carry out regional area scanning sequence 130; When carrying out regional area scanning sequence 130; Be that the antenna loop of maximum signal level and each two antenna loop of both sides, the left and right sides are scanned; Must scan at least five antenna loops this moment, and after analyzing relatively, decision will with which three voltage signal values more afterwards; Cooperate corresponding antenna loop address, calculate the place coordinate position." antenna arrangement of EM induction system and the coordinate positioning method thereof " of the curved patent of invention I253003 of related patent U.S. Patent No. such as Chinese platform.
Along with current trends, adopt the use that matches with EM induction system (like digiboard) of no battery index equipment gradually, main power source comes from this EM induction system.The inner main circuit of this no battery pointing device is to have a variable inductance; Relatively the circuit of this EM induction system then includes an antenna circuit, an internal circuit and a micro-processor interface circuit; Wherein this internal circuit also includes a filtering and amplifying circuit, a preamplifying circuit, a waveform integer circuit and one frequency-voltage conversion circuit, and this antenna circuit then comprises a plurality of antenna loop configurations and duplexer group.When no battery pointing device approaches EM induction system, inner micro-processor interface circuit can start each antenna loop switch and carry out scanning sequence, through above-mentioned relevant circuit with signal amplify, processing such as filtering, frequency-voltage transitions.Number more when the scanning sequence number of times, the scanning antenna loop is also many more; Relatively the power consumption to EM induction system also increases; Shorten the service time of EM induction system, along with the lifting of present antenna technology, the inventor tries to change the number in antenna scanning program and scanning antenna loop; So constantly can reduce the time of signal Processing, also can continue the service time of this EM induction system.
Summary of the invention
Fundamental purpose of the present invention is to work as EM induction system in the process of carrying out coordinate setting; Reduce the number of times and the number in scanning antenna loop, reduce sweep time required in the position fixing process, also can reduce power consumption; In no battery induction system, whole efficient is effectively promoted.
For reaching above-mentioned purpose, the invention provides the antenna loop scan method in a kind of coordinates computed process of EM induction system, it is characterized in that, comprise:
Carry out first scanning sequence, region-wide a plurality of antenna loops are scanned;
After obtaining the antenna loop address of peak signal, carry out second scanning sequence, antenna loop and each antenna loop of both sides, the left and right sides to peak signal scan in second scanning sequence; And
Whether the result's decision according to second scanning sequence carries out the 3rd scanning sequence, when carrying out the 3rd scanning sequence, only the single antenna loop is scanned.
Antenna loop scan method in the coordinates computed process of described EM induction system; Wherein, after carrying out second scanning sequence, scan three antenna loops and obtain three second voltage signal values; After comparing three second voltage signal values; If the antenna loop address of maximum second voltage signal values is to be positioned at middle position, when carrying out the calculating of coordinate position, then said three second voltage signal values of foundation and corresponding antenna loop address are as the parameter of coordinate computation afterwards.
Antenna loop scan method in the coordinates computed process of described EM induction system; Wherein, After carrying out second scanning sequence, can be by obtaining three second voltage signal values, after comparing three second voltage signal values according to three antenna loops of scanning; If the antenna loop address of maximum second voltage signal values is not to be positioned at middle position, then carry out the 3rd scanning sequence.
Antenna loop scan method in the coordinates computed process of described EM induction system; Wherein, When carrying out the 3rd scanning sequence; Only the other antenna loop of second voltage signal values of maximum is scanned, and the antenna loop address when carrying out the 3rd scanning sequence, must be without carrying out second scanning sequence.
Antenna loop scan method in the coordinates computed process of described EM induction system; Wherein, Follow-up when carrying out the calculating of coordinate position, then according to a tertiary voltage signal value and two second voltage signal values and corresponding antenna loop address parameter as coordinate computation.
Compared with prior art, the present invention has obtained optimum scanning efficient, is only to carry out the scanning sequence second time; And only three antenna loops are scanned at second scanning sequence; If increase scanning sequence for the third time, also only an antenna loop is scanned, adopt the number of times mode scanning antenna loop of simplifying most; The number in scanning antenna loop is also less, more is starkly lower than existing required five antenna loops that scan at least.Because in the EM induction system; The calculation procedure of coordinate setting is constantly to carry out repeatedly according to moving of inductive electromagnetic index equipment (time writer); Tire out collection and reduce antenna loop scanning times and number, integrated operation time response speed is significantly promoted, power consumption also reduces synchronously.
Now the detailed description and the claim that cooperate following diagram, embodiment, will on address other purpose of the present invention and advantage and be specified in after.
Description of drawings
Fig. 1 is the synoptic diagram of the antenna loop scanning flow process of existing EM induction system;
Fig. 2 is a process flow diagram of the present invention;
Fig. 3 is the process flow diagram of the utilization method of coordinate Calculation that scan method of the present invention is carried out.
Wherein, Reference numeral:
110 region-wide scanning sequences
120 1/2 sector scanning programs
130 regional area scanning sequences
210 first scanning sequences
220 second scanning sequences
230 the 3rd scanning sequences
310 first scanning sequences
320 first comparison programs
330 second scanning sequences
340 second comparison programs
350 program for calculating coordinate
360 the 3rd scanning sequences
370 program for calculating coordinate
Embodiment
Describe the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
As shown in Figure 2; Process flow diagram for the antenna loop scan method in the coordinates computed process of EM induction system of the present invention; Though the present invention is still the voltage signal values that adopts three antenna loops gained when scanning; Cooperate each antenna loop address computation to go out coordinate figure, but which antenna loop the present invention determine to adopt with the mode of simplifying most.Its step is following:
At first carry out first scanning sequence 210, region-wide a plurality of antenna loops are scanned;
After obtaining the antenna loop address of peak signal, carry out second scanning sequence 220, antenna loop and each antenna loop of both sides, the left and right sides to peak signal scan in second scanning sequence 220;
Can compare according to the result of second scanning sequence 220 afterwards, whether decision carries out the 3rd scanning sequence 230, when carrying out the 3rd scanning sequence 230, only the single antenna loop is scanned.In this scanning process, can decide the voltage signal values of getting three antenna loops to come coordinates computed according to predetermined condition.
As shown in Figure 2, be the process flow diagram of the detailed utilization of the present invention.For EM induction system of the present invention in the method for carrying out coordinate Calculation, its step is following:
At first carrying out first scanning sequence 310, is the scanning sequence that antenna plate is carried out region-wide a plurality of antenna loops, obtains first voltage signal values in each strip antenna loop, so that confirm the antenna loop address of maximum signal level.
All a plurality of first voltage signal values are carried out one first comparison program 320, and by confirming again maximum voltage signal value region to be defined as the first antenna loop address by the maximum voltage signal value in the data.In comparison process, the maximum voltage signal value must be greater than predefined signal discre value, if not, must repeat first scanning sequence 310.
Carry out second scanning sequence 330, according to the above-mentioned first antenna loop address with about it respectively antenna loop address of one be benchmark, carry out the scanning sequence of regional area, and obtain three second voltage signal values by above-mentioned three antenna loops.
Carry out the second comparison program 340 of three second voltage signals; If the second maximum voltage signal values is the first antenna loop address that is positioned at middle position; Then carry out program for calculating coordinate 350, three second voltage signal values and the corresponding antenna loop address that depends on gained goes out coordinate figure as the calculation of parameter of coordinate computation.
If maximum second voltage signal values is not to be the first antenna loop address, then be defined as the second antenna loop address with maximum second voltage signal values this moment, carries out scanning sequence 360 for the third time.The 3rd scanning sequence 360 only scans the other antenna loop in the second antenna loop address, and gets a tertiary voltage signal value.Wherein carry out the antenna loop address of the 3rd scanning sequence 360, can't be identical with the antenna loop address that second scanning sequence 330 is adopted, that is, and must be without carrying out second scanning sequence 330.Carry out program for calculating coordinate 370 afterwards; Two second voltage signal values of foundation and a tertiary voltage signal value and corresponding antenna loop address go out coordinate figure as the calculation of parameter of coordinate computation; Wherein first second voltage signal values is for complying with the signal value that the second antenna loop address is scanned, the signal value that another second voltage signal values is scanned for the contiguous second antenna loop address.
Comprehensive the above, the present invention has obtained optimum scanning efficient in the process of coordinate setting; It is only to carry out first and second time scanning sequence, and in carrying out second scanning sequence, also only three antenna loops is scanned, if increase scanning sequence for the third time; Also only an antenna loop is scanned; Compare each other with existing scan mode, the number of times in scanning antenna of the present invention loop is simplified most, and the number in scanning antenna loop is also less.Because in the EM induction system; The calculation procedure of coordinate setting is constantly carry out repeatedly according to moving of time writer, and institute tire out and collects minimizing antenna loop scanning times and number, and integrated operation time response speed is significantly promoted; Have tangible progressive, meet the application important document of patent.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (5)
1. the antenna loop scan method in the coordinates computed process of an EM induction system is characterized in that, comprises:
Carry out first scanning sequence, region-wide a plurality of antenna loops are scanned;
After obtaining the antenna loop address of peak signal, carry out second scanning sequence, antenna loop and each antenna loop of both sides, the left and right sides to peak signal scan in second scanning sequence; And
Whether the result's decision according to second scanning sequence carries out the 3rd scanning sequence, when carrying out the 3rd scanning sequence, only the single antenna loop is scanned.
2. the antenna loop scan method in the coordinates computed process of EM induction system according to claim 1; It is characterized in that; After carrying out second scanning sequence; Scan three antenna loops and obtain three second voltage signal values, after comparing three second voltage signal values, if the antenna loop address of maximum second voltage signal values is to be positioned at middle position; When carrying out the calculating of coordinate figure, then said three second voltage signal values of foundation and corresponding antenna loop address are as the parameter of coordinate computation afterwards.
3. the antenna loop scan method in the coordinates computed process of EM induction system according to claim 1; It is characterized in that; After carrying out second scanning sequence, can be by obtaining three second voltage signal values, after comparing three second voltage signal values according to three antenna loops of scanning; If the antenna loop address of maximum second voltage signal values is not to be positioned at middle position, then carry out the 3rd scanning sequence.
4. the antenna loop scan method in the coordinates computed process of EM induction system according to claim 3; It is characterized in that; When carrying out the 3rd scanning sequence; Only the other antenna loop of second voltage signal values of maximum is scanned, and the antenna loop address when carrying out the 3rd scanning sequence, must be without carrying out second scanning sequence.
5. the antenna loop scan method in the coordinates computed process of EM induction system according to claim 3; It is characterized in that; Follow-up when carrying out the calculating of coordinate figure, then according to a tertiary voltage signal value and two second voltage signal values and corresponding antenna loop address parameter as coordinate computation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445651A (en) * | 2018-11-09 | 2019-03-08 | 张银虎 | Electromagnetic screen antenna scanning method |
| CN114089842A (en) * | 2020-07-31 | 2022-02-25 | 神讯电脑(昆山)有限公司 | Method for determining tilt direction of electromagnetic pen, method for calculating cursor position of electromagnetic pen, and display device |
Citations (3)
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| CN1457018A (en) * | 2002-05-10 | 2003-11-19 | 天瀚科技股份有限公司 | Antenna arrangement of electromagnetic inducing system and coordinate positioning method thereof |
| CN101266532A (en) * | 2007-03-14 | 2008-09-17 | 太瀚科技股份有限公司 | Antenna board structure and its scanning method |
| US20100206644A1 (en) * | 2009-02-13 | 2010-08-19 | Waltop International Corporation | Electromagnetic Induction Handwriting System and Coordinate Determining Method Thereof |
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2010
- 2010-12-17 CN CN2010106128814A patent/CN102566792A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1457018A (en) * | 2002-05-10 | 2003-11-19 | 天瀚科技股份有限公司 | Antenna arrangement of electromagnetic inducing system and coordinate positioning method thereof |
| CN101266532A (en) * | 2007-03-14 | 2008-09-17 | 太瀚科技股份有限公司 | Antenna board structure and its scanning method |
| US20100206644A1 (en) * | 2009-02-13 | 2010-08-19 | Waltop International Corporation | Electromagnetic Induction Handwriting System and Coordinate Determining Method Thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445651A (en) * | 2018-11-09 | 2019-03-08 | 张银虎 | Electromagnetic screen antenna scanning method |
| CN114089842A (en) * | 2020-07-31 | 2022-02-25 | 神讯电脑(昆山)有限公司 | Method for determining tilt direction of electromagnetic pen, method for calculating cursor position of electromagnetic pen, and display device |
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Application publication date: 20120711 |