CN102147457B - Method for detecting slant angle of electromagnetic input pen - Google Patents
Method for detecting slant angle of electromagnetic input pen Download PDFInfo
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- CN102147457B CN102147457B CN 201010111154 CN201010111154A CN102147457B CN 102147457 B CN102147457 B CN 102147457B CN 201010111154 CN201010111154 CN 201010111154 CN 201010111154 A CN201010111154 A CN 201010111154A CN 102147457 B CN102147457 B CN 102147457B
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Abstract
The invention relates to a method for detecting a slant angle of an electromagnetic input pen, which comprises the following steps: firstly, providing the electromagnetic input pen above an X/Y-axis antenna Xn/Yn; then scanning the number of an antenna a at both sides of the antenna Xn/Yn which is taken as a central point; analyzing the distribution of main signals at the central point and both sides of the antenna Xn/Yn according to scanning signals and the scanned number of the antenna a; determining the number of the antennas needed to be sampled at both sides; opening the antennas needed at both sides and capturing signals of the electromagnetic input pen according to the number of the sampled antennas; finally, judging the slant angle of the electromagnetic input pen according to the sampled signals of the antennas at both sides.
Description
Technical field
The present invention relates to a kind of method for detecting of electromagnetism input pen, particularly relate to a kind of pitch angle method for detecting of electromagnetism input pen.
Background technology
The at present pitch angle of electromagnetic type input pen detecting mode, for example United States Patent (USP) 5,751,229 and 5,748, the 110th, after being transmitted by time writer, behind the signal that receives the electromagnetic type input pen, process generation magnitude of voltage and the X of electromagnetic type input pen position or the corresponding relations of Y coordinate such as comprising signal amplification, filtering, rectification, detecting phase and analog digital conversion through a series of signal by antenna or inductive coil.When the attitude of electromagnetic type input pen was vertical with antenna or inductive coil, the antenna of electromagnetic type input pen position or inductive coil and respective coordinates place voltage signal values intensity thereof were maximum, and were unique coordinate that voltage signal values occurs.But when electromagnetic type input pen attitude when being not vertical with antenna or inductive coil, the antenna that electromagnetic type input pen position is contiguous or inductive coil and respective coordinates place thereof also have voltage signal values and occur, but with respect to the voltage signal values of electromagnetic type input pen position, be intensity time high voltage signal values.This moment, the pitch angle of electromagnetic type input pen utilized the highest voltage signal values of electromagnetic type input pen position intensity, be voltage signal values and X or Y coordinate graph of a relation main peak value (main peak value), with the inferior high voltage signal values of intensity, be voltage signal values and X or Y coordinate graph of a relation minor peaks (sub peak value), carry out calculating after the functional operation angle at electromagnetic type input pen pitch angle.
But the pitch angle of above-mentioned traditional electrical magnetic-type input pen detecting mode, the inferior high voltage signal values of must working strength the highest voltage signal values or main peak value signal and intensity or minor peaks signal are done the angle that calculates the pitch angle after the functional operation.Take the angle of X-axis as example, when the electromagnetic type input pen maintains certain altitude, and X-axis to be 0 degree tilt but Y-axis when one angle of inclination is arranged, the main peak value signal of X-axis can change with the minor peaks signal and corresponding ratio value also can change to some extent, and the variation of main peak value signal and minor peaks signal power is equity not necessarily, relation on also not necessarily proportional, easily causing the variation of main peak value signal because of electromagnetic type input pen position affects the accuracy at pitch angle, increase the error of judging on the electromagnetic type input pen angle, in computing, increase on foot loaded down with trivial details judgement.
Detect the shortcoming of mode in view of the pitch angle of above-mentioned traditional electrical magnetic-type input pen, the present invention proposes a kind of pitch angle method for detecting of electromagnetism input pen, to solve the loaded down with trivial details problem of traditional electrical magnetic-type input pen pitch angle detecting mode error in judgement and computing.
This shows, the method for detecting of above-mentioned existing electromagnetism input pen obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, finished by development but have no for a long time applicable design always, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious wish of relevant dealer solves.Therefore how to found a kind of pitch angle method for detecting of novel electromagnetism input pen, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that the method for detecting of above-mentioned existing electromagnetism input pen exists, the inventor is based on being engaged in for many years abundant practical experience and professional knowledge of this type of product design manufacturing, and the utilization of cooperation scientific principle, positive research and innovation in addition, to founding a kind of pitch angle method for detecting of novel electromagnetism input pen, can improve the method for detecting of general existing electromagnetism input pen, make it have more practicality.Through constantly research, design, and through after repeatedly studying sample and improvement, finally create the present invention who has practical value.
Summary of the invention
Fundamental purpose of the present invention is, overcome the defective of the method for detecting existence of existing electromagnetism input pen, and provide a kind of pitch angle method for detecting of novel electromagnetism input pen, technical matters to be solved is to make it can not be subject to the variation of position signal main peak value and the accuracy that affects the pitch angle, reduce the error of judging on the electromagnetic type input pen angle, be very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.The pitch angle method for detecting of a kind of electromagnetism input pen that proposes according to the present invention, the method may further comprise the steps:
Provide an electromagnetism input pen at X/Y axle antenna X
n/ Y
nThe top;
With antenna X
n/ Y
nCentered by the some both sides respectively scan a antenna number;
A antenna number according to sweep signal and scanning is analyzed antenna X
n/ Y
nCentral point and both sides main signal distribute;
Determine the number of antennas of the required sampling in both sides;
Open the signal of the required antenna acquisition time writer in both sides according to the number of antennas of sampling; And
Judge a pitch angle of this electromagnetism input pen according to both sides antenna sampled signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The pitch angle method for detecting of aforesaid electromagnetism input pen, the number of antennas of the required sampling in wherein said decision both sides comprise each one to eight antenna of both sides.
The pitch angle method for detecting of aforesaid electromagnetism input pen, this pitch angle of wherein said electromagnetism input pen is by this antenna X
n/ Y
nOne to eight aerial signal intensity of each single side and judge with the ratio value of the summation of dual side-edge signal and to calculate and go out.
The pitch angle method for detecting of aforesaid electromagnetism input pen, wherein said antenna X
n/ Y
nCentered by the some both sides respectively scan a antenna number, a is the integer between to eight.
The pitch angle method for detecting of aforesaid electromagnetism input pen, this pitch angle of wherein said electromagnetism input pen is by this antenna X
n/ Y
nThe difference of each aerial signal intensity of both sides is judged calculating and is gone out.
The present invention compared with prior art has obvious advantage and beneficial effect.As known from the above, for achieving the above object, the invention provides a kind of pitch angle method for detecting of electromagnetism input pen, the pitch angle method for detecting of this electromagnetism input pen comprises following steps.At first provide an electromagnetism input pen at X/Y axle antenna X
n/ Y
nThe top.Then with antenna X
n/ Y
nCentered by the some both sides respectively scan a antenna number.Then analyze antenna X according to a antenna number of sweep signal and scanning
n/ Y
nCentral point and both sides main signal distribute.Then determine the number of antennas of the required sampling in both sides.Then open the signal of the required antenna acquisition time writer in both sides according to the number of antennas of sampling.Judge at last a pitch angle of this electromagnetism input pen according to both sides antenna sampled signal.
By technique scheme, the pitch angle method for detecting of electromagnetism input pen of the present invention has following advantages and beneficial effect at least: the present invention utilizes the mode of detecting electromagnetic type input pen position both sides signal intensity and the both sides signal peak of taking a sample to carry out functional operation, and is gone to judge the angle of inclination of electromagnetic type input pen by result of calculation.So can not be subject to the variation of position signal main peak value and affect the accuracy at pitch angle, reduce the error of judging on the electromagnetic type input pen angle.
In sum, the invention relates to a kind of pitch angle method for detecting of electromagnetism input pen, the pitch angle method for detecting of this electromagnetism input pen comprises following steps.At first provide an electromagnetism input pen at X/Y axle antenna X
n/ Y
nThe top.Then with antenna X
n/ Y
nCentered by the some both sides respectively scan a antenna number.Then analyze antenna X according to a antenna number of sweep signal and scanning
n/ Y
nCentral point and both sides main signal distribute.Then determine the number of antennas of the required sampling in both sides.Then open the signal of the required antenna acquisition time writer in both sides according to the number of antennas of sampling.Judge at last a pitch angle of this electromagnetism input pen according to both sides antenna sampled signal.The present invention has significant progress technically, and has obvious good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is the schematic diagram of an electromagnetic induction input system of one embodiment of the invention.
Fig. 2 is that the electromagnetic type input pen is in the antenna field (X of electromagnetic induction input system
N-8-X
N+8) schematic diagram of the angle that tilts.
Fig. 3 is the X-axis voltage signal that antenna field captured and coordinate schematic diagram via the electromagnetic type input system.
Fig. 4 is the process flow diagram of pitch angle method for detecting one embodiment of electromagnetism input pen of the present invention.
102: electromagnetic induction control substrate
104: antenna field
106: the electromagnetism input pen
202: the electromagnetism input pen is at X/Y axle antenna X
n/ Y
nThe top.
204: with X
n/ Y
nCentered by the some both sides respectively scan a antenna number
206: analyze central authorities according to the antenna number of sweep signal and scanning and distribute with the both sides main signal
208: the number of antennas that determines the required sampling in both sides
210: the signal of opening the required antenna acquisition time writer in both sides according to the number of antennas of sampling
212: judge electromagnetism input pen pitch angle according to both sides antenna sampled signal
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of pitch angle method for detecting, structure, feature and the effect thereof of the electromagnetism input pen that foundation the present invention is proposed are described in detail as follows.
Relevant aforementioned and other technology contents of the present invention, Characteristic can clearly present in the following detailed description that cooperates with reference to graphic preferred embodiment.For convenience of description, in following embodiment, identical element represents with identical numbering.
Some embodiments of the present invention will be described in detail as follows.Yet except following description, the present invention can also be widely implements at other embodiment, and scope of the present invention is not subjected to the restriction of embodiment, its with after claim be as the criterion.Moreover for clearer description being provided and being more readily understood the present invention, graphic interior each several part is not drawn according to its relative size, and some size is compared with other scale dependent and exaggerated; Incoherent detail section is not drawn fully yet, in the hope of graphic succinct.
Fig. 1 shows an electromagnetic induction input system of one embodiment of the invention.The electromagnetic induction input system comprises electromagnetic induction control substrate 102 and an electromagnetism input pen (stylus) 106.Electromagnetic induction control substrate 102 comprises and contains plural number and arrange antenna field 104 and the Control Component (not icon) that part parallel to each other overlaps and is made of conductor or inductive coil along X with Y-direction.Control Component comprises processing unit for example microcontroller (Micro-controller Unit, MCU) and coherent signal filtering (filter), signal amplification (amplifier), duplexer (switch), detecting phase (phase detector), analog digital conversion signal processing circuits such as (A/D converter).Electromagnetism input pen 106 comprises a resonance circuit (resonance circuit).The coordinate of electromagnetism input pen 106 transmits with receiving by the electromagnetic wave between the inductive coil on electromagnetism input pen 106 internal resonance circuit and the electromagnetic induction control substrate 102 and obtains.
Fig. 2 shows that the electromagnetic type input pen is in the antenna field (X of electromagnetic induction input system
N-8-X
N+8) schematic diagram of the angle that tilts.In Fig. 2, when the electromagnetic type input pen is defined as 0 ° during perpendicular to the antenna field of electromagnetic induction input system, being poured onto to the right when being parallel to antenna field is 90 °, is poured onto to the left side when being parallel to antenna field to be-90 °.
Fig. 3 is shown as the X-axis voltage signal that antenna field captured and the coordinate schematic diagram via the electromagnetic type input system.Wherein transverse axis is the antenna number of X-axis, and the longitudinal axis is the intensity of voltage signal, and the signal distribution plots of signal main peak value and both sides signal time cutting edge of a knife or a sword value.The Y-axis signal also is like this.Below explanation all is as main take the X-axis signal.And extend to the Y-axis signal.
When the electromagnetic type input pen at X-axis antenna X
nThe top is with X
nCentered by the some both sides respectively scan a plurality of antenna number, antenna number strong and weak by signal that each antenna scanned out and that scan goes to analyze a plurality of main signal distributions.Because the signal distributions of electromagnetic induction has symmetry, the both sides peak value is when doing sample of signal, can use corresponding antenna and do sampling, and when using the sampling of corresponding antenna number, when pen has when inclination or improves, it is consistent that its both sides peak value ratio changes, and is not subject to the main peak value signal strong and weak and cause the error at angle of inclination.And the sampling of both sides minor peaks signal can be the summation of odd number or a plurality of aerial signal intensity.After the mode of the sampling that has determined both sides minor peaks signal is odd number or a plurality of antenna.Carrying out pitch angle when detecting, sample of signal is as long as open and determine good antenna sampling, the signal value of the main peak that do not need to take a sample.After sampling is finished, use again its signal intensity and carry out the angle of inclination that the electromagnetic type input pen is judged in functional operation.
First embodiment of the invention is according to Fig. 2 and shown in Figure 3, when the electromagnetism input pen at X-axis antenna X
nThe top is with X
nCentered by the some both sides respectively scan 8 antenna number, left bark mark scanning antenna number is X
N-1-X
N-8And the right scanning antenna number is X
N+1-X
N+8Go to analyze 3 main signal distributions by the signal that each antenna scanned out antenna number strong and weak and scanning, for example: the main peak signal is X
N-2-X
N+2, left peak-to-peak signal is X
N-7-X
N-4, right peak-to-peak signal is X
N+4-X
N+7
This embodiment is take the summation of a plurality of aerial signal intensity as example, and left peak-to-peak signal is sampled as X
N-7-X
N-4The signal strength values summation, and right peak-to-peak signal is sampled as X
N+4-X
N+7The signal strength values summation.After the mode of the sampling that has determined the both sides peak-to-peak signal, when carrying out the pitch angle detecting, peak signal sampling in both sides is as long as open X
N-7-X
N-4And X
N+4-X
N+7The antenna sampled signal get final product.
After sampling was finished, left peak-to-peak signal was sampled as X
N-7-X
N-4Signal strength values summation=left peak-to-peak signal value; Right peak-to-peak signal is sampled as X
N+4-X
N+7Signal strength values summation=right peak-to-peak signal value, pass through functional operation again after, go to judge the angle of inclination.Below go to judge the angle of inclination for a kind of functional operation wherein.
When sample of signal is finished, known left peak-to-peak signal value and right peak-to-peak signal value, this functional operation is with the judgement as the pitch angle of the ratio value of X-axis both sides peak signal value: when vertical antenna district, X-axis both sides peak signal value is for equating;
Right forward's signal value/(right forward's signal value+left peak-to-peak signal value)=1/2 → angle is 0 degree,
When pen is poured onto to the right when being parallel to antenna field, the right peak-to-peak signal value of X-axis is much larger than the signal value at left peak:
Right forward's signal value/(right forward's signal value+left peak-to-peak signal value) ≒ 1 → angle is 90 degree,
When pen is poured onto to the left side when being parallel to antenna field, the left peak-to-peak signal value of X-axis is much larger than the signal value at right peak:
Right forward's signal value/(right forward's signal value+left peak-to-peak signal value) ≒ 0 → angle is-90 degree,
Right forward's signal value/(right forward's signal value+left peak-to-peak signal value)=ratio value B,
And ratio value B can drop between 0≤ratio value B≤1, can correspond on the corresponding angle according to different ratio value B.
Above embodiment also can use left forward's signal value/(right forward's signal value+left peak-to-peak signal value)=ratio value, and resulting ratio value can be same as the previously described embodiments, but defined vergence direction but is opposite.Differ from a negative sign so judge angle of inclination and above-described embodiment.
Second embodiment of the invention is for working as the electromagnetism input pen at X-axis antenna X
nThe top is with X
nCentered by the some both sides respectively scan 8 antenna number, left bark mark scanning antenna number is X
N-1-X
N-8And the right scanning antenna number is X
N-1-X
N+8Go to analyze 3 main signal distributions by the signal that each antenna scanned out antenna number strong and weak and scanning, for example: the main peak signal is X
N-2-X
N+2, left peak-to-peak signal is X
N-7-X
N-4, right peak-to-peak signal is X
N+4-X
N+7
This embodiment is take the individual antenna signal intensity as example, and left peak-to-peak signal is sampled as X
N-5Signal intensity, and right peak-to-peak signal is sampled as X
N+5Signal intensity.After the mode of the sampling that has determined the both sides peak-to-peak signal, when carrying out the pitch angle detecting, peak signal sampling in both sides is as long as open X
N-5And X
N+5The antenna sampled signal get final product.
After sampling was finished, left peak-to-peak signal was sampled as X
N-5Signal strength values=left peak-to-peak signal value; Right peak-to-peak signal is sampled as X
N+5Signal strength values=right peak-to-peak signal value, pass through functional operation again after, go to judge the angle of inclination.Below go to judge the angle of inclination for a kind of functional operation wherein.
When sample of signal is finished, known left peak-to-peak signal value and right peak-to-peak signal value, this functional operation is with the judgement as the pitch angle of the difference of X-axis both sides peak signal value:
When vertical antenna district, X-axis both sides peak signal value is for equating;
Right forward's signal value-left peak-to-peak signal value=0 → angle is 0 degree,
When pen is poured onto to the right when being parallel to antenna field, the right peak-to-peak signal value of X-axis is much larger than the signal value at left peak:
Right forward's signal value-right peak-to-peak signal value → angle of left peak-to-peak signal Zhi ≒ is 90 degree,
When pen is poured onto to the left side when being parallel to antenna field, the left peak-to-peak signal value of X-axis is much larger than the signal value at right peak:
Right forward's signal value-left peak-to-peak signal Zhi ≒-left peak-to-peak signal value → angle is-90 degree,
Right forward's signal value-left peak-to-peak signal value=difference A, and difference A can drop on-left peak-to-peak signal value≤difference A≤right peak-to-peak signal value between, can correspond on the corresponding angle according to different difference A.
Above embodiment also can use left forward's signal value-right peak-to-peak signal value=difference, and resulting difference can differ from a negative sign with the above embodiments.Can judge the angle of inclination with the same mode.And judgement can be done according to above-described embodiment in the angle of inclination of Y direction.
Fig. 4 shows the process flow diagram of pitch angle method for detecting one embodiment of electromagnetism input pen of the present invention.At first, in step 202, the electromagnetism input pen is placed X/Y axle antenna X
n/ Y
nThe top.Then in step 204, with antenna X
n/ Y
nCentered by the some both sides respectively scan a antenna number.Then in step 206, analyze central authorities according to the antenna number of sweep signal and scanning and distribute with the both sides main signal.Then in step 208, determine the number of antennas of the required sampling in both sides.Then in step 210, open the signal of the required antenna acquisition time writer in both sides according to the number of antennas of sampling.In step 212, judge electromagnetism input pen pitch angle according to both sides antenna sampled signal at last.
The present invention detects the mode of electromagnetic type input pen position both sides signal intensity and the both sides signal peak of taking a sample and carries out functional operation, and is judged the angle of inclination of electromagnetic type input pen by result of calculation.So can not be subject to the variation of position signal main peak value and affect the accuracy at pitch angle, and can reduce the error of judging on the electromagnetic type input pen angle.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (5)
1. the pitch angle method for detecting of an electromagnetism input pen is characterized in that the method may further comprise the steps:
Provide an electromagnetism input pen at X/Y axle antenna X
n/ Y
nThe top;
With antenna X
n/ Y
nCentered by the some both sides respectively scan a antenna number;
A antenna number according to sweep signal and scanning is analyzed antenna X
n/ Y
nCentral point and both sides main signal distribute;
Determine the number of antennas of the required sampling in both sides;
Open the signal of the required respective antenna acquisition time writer in both sides according to the number of antennas of sampling; And
Judge a pitch angle of this electromagnetism input pen according to the signal intensity of both sides respective antenna sampled signal.
2. the pitch angle method for detecting of electromagnetism input pen according to claim 1, the number of antennas that it is characterized in that the required sampling in wherein said both sides are each one to eight antenna of both sides.
3. the pitch angle method for detecting of electromagnetism input pen according to claim 2 is characterized in that this pitch angle of wherein said electromagnetism input pen is by this antenna X
n/ Y
nThe signal intensity of any side sampled signal and judge with the ratio value of the signal intensity summation of all sampled signals of dual-side and to calculate and go out.
4. the pitch angle method for detecting of electromagnetism input pen according to claim 1 is characterized in that wherein with described antenna X
n/ Y
nCentered by the some both sides respectively scan a antenna number, a is the integer between to eight.
5. the pitch angle method for detecting of electromagnetism input pen according to claim 4 is characterized in that this pitch angle of wherein said electromagnetism input pen is by this antenna X
n/ Y
nThe difference of each aerial signal intensity that both sides are corresponding is judged calculating and is gone out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010111154 CN102147457B (en) | 2010-02-10 | 2010-02-10 | Method for detecting slant angle of electromagnetic input pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010111154 CN102147457B (en) | 2010-02-10 | 2010-02-10 | Method for detecting slant angle of electromagnetic input pen |
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|---|---|
| CN102147457A CN102147457A (en) | 2011-08-10 |
| CN102147457B true CN102147457B (en) | 2013-01-02 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI601053B (en) * | 2014-02-12 | 2017-10-01 | 元太科技工業股份有限公司 | Correction method of touch point and electromagnetic-type touch panel using the same |
| CN114089842B (en) * | 2020-07-31 | 2024-06-11 | 神讯电脑(昆山)有限公司 | Method for judging inclination direction of electromagnetic pen and calculating cursor position and display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5748110A (en) * | 1995-04-13 | 1998-05-05 | Wacom Co., Ltd. | Angular input information system relative to a tablet for determining an incline angle of a pointer or stylus |
| US5751229A (en) * | 1994-04-28 | 1998-05-12 | Wacom Co., Ltd. | Angular information input system |
| CN1423234A (en) * | 2001-12-07 | 2003-06-11 | 天瀚科技股份有限公司 | Image processing system with hand-write input function and its executing method |
| CN101639752A (en) * | 2008-07-28 | 2010-02-03 | 汉王科技股份有限公司 | Method and device for inputting electromagnetic induction scrolling information |
-
2010
- 2010-02-10 CN CN 201010111154 patent/CN102147457B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751229A (en) * | 1994-04-28 | 1998-05-12 | Wacom Co., Ltd. | Angular information input system |
| US5748110A (en) * | 1995-04-13 | 1998-05-05 | Wacom Co., Ltd. | Angular input information system relative to a tablet for determining an incline angle of a pointer or stylus |
| CN1423234A (en) * | 2001-12-07 | 2003-06-11 | 天瀚科技股份有限公司 | Image processing system with hand-write input function and its executing method |
| CN101639752A (en) * | 2008-07-28 | 2010-02-03 | 汉王科技股份有限公司 | Method and device for inputting electromagnetic induction scrolling information |
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