CN102681677A - Electromagnetic pen for electronic white board and pressure sensitivity control method thereof - Google Patents
Electromagnetic pen for electronic white board and pressure sensitivity control method thereof Download PDFInfo
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- CN102681677A CN102681677A CN2011100543076A CN201110054307A CN102681677A CN 102681677 A CN102681677 A CN 102681677A CN 2011100543076 A CN2011100543076 A CN 2011100543076A CN 201110054307 A CN201110054307 A CN 201110054307A CN 102681677 A CN102681677 A CN 102681677A
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Abstract
The invention discloses an electromagnetic pen for an electronic white board and a pressure sensitivity control method thereof, belonging to the field of electromagnetic signal processing. The pressure sensitivity control method of the electromagnetic pen provided by the invention comprises the following steps of: connecting a non-writing end of a pen point with a variable capacitor, and changing capacitance in real time according to variation of the pressure applied to the pen point when writing; in a charging-discharging period, recording the discharging time of the variable capacitor in the electromagnetic pen, corresponding to the pressure applied to the pen point, and transmitting a resonance signal including the discharging time information to the electronic white board. The electromagnetic pen and the pressure sensitivity control method thereof provided by the invention can sense the pressure applied to the pen point and make the sensitivity higher through the application of the variable capacitor, and can reflect different writing states such as priorities when writers write in real time so as to write naturally and smoothly, and improve the user experience.
Description
Technical field
The present invention relates to the electromagnetic signal process field, be specifically related to a kind of time writer and pressure sensitivity control method thereof that is used for electronic whiteboard.
Background technology
Along with the development of multimedia technology, computer technology and display technique is risen, electronic whiteboard as a kind ofly can be used to impart knowledge to students, the multimedia tool of occasions such as training, meeting, demonstration, it combines the closelyst with traditional teaching, demonstration mode.Replace traditional blackboard with special electronic whiteboard (or claiming projection screen), can on electronic whiteboard, write or the analog mouse function through electronic pen, its result can directly be shown on the electronic whiteboard.
In the prior art; When time writer is write, be merely able on electronic whiteboard to show the mobile person's handwriting of time writer on electronic whiteboard, but the different states of writing such as the order of importance and emergency can't reflect that the writer writes in real time according to writing physical strength the time; Therefore, can't satisfy user's user demand.
Summary of the invention
The object of the present invention is to provide a kind of time writer and pressure sensitivity control method thereof that is used for electronic whiteboard, the differences such as the order of importance and emergency in the time of can on electronic whiteboard, reflecting user writing are in real time write state, improve user's experience.
The time writer that is used for electronic whiteboard according to the invention comprises: nib, variable capacitance and processor; Wherein,
Variable capacitance connects the non-writing end of time writer nib, and when writing the suffered pressure real time altering capacitance of nib;
Processor is used to control variable capacitance and periodically discharges and recharges, and according to discharge time of the corresponding variable capacitance of nib pressure, sends the electromagnetic signal that comprises variable capacitance information discharge time to electronic whiteboard.
In the such scheme, said time writer also comprises: timer and voltage comparator;
Said voltage comparator is used for the magnitude of voltage and the preset threshold value magnitude of voltage of variable capacitance are compared, and when the magnitude of voltage of variable capacitance is lower than the preset threshold value magnitude of voltage, to processor output switching activity signal;
Timer, the discharge time that is used under the control of processor, writing down variable capacitance; Be specially: when variable capacitance began to discharge, timer picked up counting; When processor received the energizing signal of voltage comparator, timer stopped timing.
In the such scheme, said processor carries out numerical coding the discharge time of the variable capacitance that also is used for timer is write down.
In the such scheme, said time writer also comprises: resonant circuit, current rectifying and wave filtering circuit resonant on-off circuit;
Resonant circuit is used for when nib during near electronic whiteboard, and the electromagnetic signal of sending according to electronic whiteboard induces resonance signal, and sends to current rectifying and wave filtering circuit;
Current rectifying and wave filtering circuit, the resonance signal that is used for that resonant circuit is responded to carry out rectifying and wave-filtering to be handled, and converts DC voltage into and send to processor, for processor provides working power;
The resonant switch circuit is used for the numerical coding of said processor output is affacted the resonance signal that resonant circuit is sensed, and will comprise said digitally coded resonance signal through resonant circuit and send to electronic whiteboard.
In the such scheme, said time writer also comprises function button, and said processor also is used for the status information of function button, variable capacitance are compiled into the string number coding discharge time, and will comprise this a string digitally coded resonance signal and send to electronic whiteboard.
The present invention also provides a kind of pressure sensitivity control method of time writer, and this method comprises:
Non-writing end at the time writer nib connects variable capacitance, and when writing the suffered pressure real time altering capacitance of nib;
Discharge and recharge in the cycle at one, record time writer inner discharge time with the corresponding variable capacitance of nib pressure value, and the resonance signal that will comprise variable capacitance information discharge time sends to electronic whiteboard.
In the such scheme, be the discharge time of said variable capacitance: when variable capacitance begins to discharge, when the magnitude of voltage of variable capacitance is lower than the preset threshold value magnitude of voltage, end.
In the such scheme; The said resonance signal that will comprise variable capacitance information discharge time sends to electronic whiteboard; Be specially: will be compiled as numerical coding with the discharge time of the corresponding variable capacitance of said force value, will comprise said digitally coded resonance signal again and send to electronic whiteboard.
In the such scheme; Said resonance signal sends to after the electronic whiteboard; This method also comprises: electronic whiteboard is resolved received resonance signal; Obtain and the corresponding variable capacitance of the nib pressure value numerical coding of discharge time, and according to said numerical coding output and the corresponding person's handwriting state of this force value.
In the such scheme, this method also comprises: the status information of function button on the time writer, variable capacitance are compiled into the string number coding discharge time, and will comprise this a string digitally coded resonance signal and send to electronic whiteboard.
Time writer that is used on electronic whiteboard, writing of the present invention and pressure sensitivity control method thereof; Non-writing end through at nib connects variable capacitance; Can reflect in real time that the differences such as the order of importance and emergency the when writer writes write state, show different lines on the electronic whiteboard in real time thereby be implemented in, for example; The thickness difference or the color of lines are not equal, have improved user's experience.In addition, adopt the variable capacitance not only can the suffered pressure of sensing nib, and highly sensitive, only need contact gently to get final product pressure sensor when writing, make write natural and tripping.
Description of drawings
Fig. 1 is the inner structure synoptic diagram of the said time writer of embodiment of the present invention;
Fig. 2 is the variable capacitance of the said time writer of embodiment of the present invention and the circuit connecting relation synoptic diagram of processor and voltage comparator;
Fig. 3 is the process flow diagram of the pressure sensitivity control method of the said time writer of embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment scheme according to the invention is elaborated.
The principle of work of the electromagnetism input system that time writer and electronic whiteboard are formed is: electronic whiteboard sends pumping signal, and the resonant circuit that the excitation time writer is inner also induces electromagnetic signal; Said electromagnetic signal is sent to electronic whiteboard after treatment, and electronic whiteboard is confirmed the position of time writer according to the electromagnetic signal that is received, thereby demonstrates corresponding person's handwriting.
Fig. 1 is the inner structure synoptic diagram of the time writer of an embodiment of the invention.
As shown in Figure 1, the time writer that is used in this embodiment on electronic whiteboard comprises: variable capacitance, processor, resonant switch circuit, resonant circuit and current rectifying and wave filtering circuit.
Variable capacitance connects the non-writing end of time writer nib, and the suffered pressure variation of nib changed when the capacitance Cx ability basis of variable capacitance was write.Particularly, the nib pressure is big more, and variable capacitance Cx is big more; The nib pressure is more little, and Cx is more little for variable capacitance.
Processor is used to control variable capacitance and periodically discharges and recharges, and according to discharge time of the corresponding variable capacitance of nib pressure, the control time writer sends the resonance signal that comprises information discharge time to electronic whiteboard.
Being not linear relationship between variable capacitance pressure and the capacitance, is very difficult so desire to calculate the pressure value according to variable capacitance.According to variable capacitance discharge time constant
; Can know; The nib pressure is big more; Variable capacitance Cx is big more, and variable capacitance is just long more discharge time; The nib pressure is more little, and Cx is more little for variable capacitance, and variable capacitance is just short more discharge time; Wherein, R2 is parallelly connected with variable capacitance, and R2 and variable capacitance are formed discharge loop.Hence one can see that; The suffered pressure of the discharge time of variable capacitance and nib has indirect corresponding relation; According to just can corresponding judging the suffered pressure size of nib the discharge time of variable capacitance; And then be reflected on the person's handwriting that time writer writes according to the size of the length of the said discharge time pressure that nib is suffered, realize the variation of the order of importance and emergency of time writer person's handwriting.
Further, time writer according to the invention can also comprise: timer and voltage comparator.
Said voltage comparator is used for the magnitude of voltage and the preset threshold value magnitude of voltage of variable capacitance are compared, and when the magnitude of voltage of variable capacitance is lower than the preset threshold value magnitude of voltage, to processor output switching activity signal.Here, said threshold voltage V
RefCan be provided with according to actual conditions, in the present embodiment, V
RefGet variable capacitance magnitude of voltage 1/4.
Timer, the discharge time that is used under the control of processor, writing down variable capacitance; Particularly, when variable capacitance began to discharge, the processor control timer picked up counting; When processor received the energizing signal of voltage comparator, control timer stopped timing.
Here, can adopt independently voltage comparator and timer, also can through processor itself accomplish voltage ratio with function regularly.
Further, said processor, carry out numerical coding the discharge time of the variable capacitance that also is used for timer is write down, and export to the resonant switch circuit; The resonant switch circuit affacts said numerical coding on the resonance signal that resonant circuit senses, and will comprise said digitally coded resonance signal through resonant circuit and send to electronic whiteboard.
Like this; After electronic whiteboard receives said resonance signal; Parse and variable capacitance corresponding said numerical coding discharge time, corresponding indirectly because of this numerical coding with nib pressure value, therefore can export and the corresponding person's handwriting state of said force value according to the numerical coding that parses; Thus, just can on electronic whiteboard, show thickness degree and the corresponding person's handwriting of nib pressure.
Fig. 2 is variable capacitance and the circuit connecting relation synoptic diagram of processor and voltage comparator of the time writer of this embodiment.
As shown in Figure 2, resistance R 2 is parallelly connected with variable capacitance Cx, constitutes the discharge loop of variable capacitance; The end ground connection of R2, the other end connects the voltage input end of voltage comparator U1.For prolonging the discharge time of variable capacitance, the resistance of resistance R 2 is bigger; Here, the resistance of resistance R 2 is not done concrete qualification, can decide according to actual conditions.
Preferably, time writer also comprises and is used for controlling the on-off circuit that variable capacitance discharges and recharges, and is composed in series with diode D1 by resistance R 1.For making variable capacitance be full of electricity fast, the resistance of resistance R 1 is less, and occurrence can be decided according to actual conditions.On-off circuit is near an I/O port (Port1) of an end connection processing device of resistance R 1, and the other end connects the non-earth terminal of variable capacitance discharge loop.Under the control of processor P ort1 port output level, during diode D1 conducting in the on-off circuit, the variable capacitance rapid charge; When diode D1 broke off, variable capacitance slowly discharged through discharge loop.
Here, the discharge loop of variable capacitance, processor, voltage comparator and timer constitute variable capacitance detection module discharge time, because variable capacitance is corresponding with the nib pressure discharge time, have therefore also constituted the pressure detection module.Electronic whiteboard according to the output of said pressure detection module with the corresponding electromagnetic signal of force value, just can obtain the corresponding person's handwriting state of thickness degree and nib pressure.
In conjunction with circuit shown in Figure 2, once discharging and recharging in the cycle, the course of work of time writer of the present invention is following:
Processor port Port1 is the output high level earlier, the on-off circuit conducting, because resistance R 1 resistance is very little, variable capacitance rapid charge at this moment also makes voltage reach maximal value.Then, processor port Port1 output low level, on-off circuit breaks off, and variable capacitance begins slowly to discharge through the bigger resistance R 2 of resistance value ratio; Simultaneously, processor startup timer picks up counting.
In the process of variable capacitance discharge, the voltage on variable capacitance is lower than preset threshold value voltage V
RefThe time, after voltage comparator U1 output switching activity signal, processor received this energizing signal through port Port2, the order timer stopped timing, and like this, the time that timer write down is variable capacitance in the discharge time that once discharges and recharges in the cycle.
Particularly, when nib was not pressed, the capacitance of variable capacitance was fixing initial value C
0, discharge time constant
Capacitance C owing to variable capacitance this moment
0Very little, thereby the discharge time constant of variable capacitance
Very little, discharge time is extremely short, and the voltage on the variable capacitance drops to threshold voltage V very soon
RefBelow.Voltage on variable capacitance is lower than V
RefThe time, the output of voltage comparator is overturn, and the processor control timer stops timing.Because nib is not pressed; This moment; The suffered zero pressure value of the timing that timer write down and nib is corresponding; Processor will be compiled as numerical coding corresponding to the timing of zero pressure value, through the resonant switch circuit this numerical coding affacted on the resonance signal that resonant circuit senses then, and will comprise this digitally coded resonance signal by resonant circuit and send to electronic whiteboard.After electronic whiteboard receives and comprises this digitally coded resonance signal; Parse corresponding with the zero pressure value variable capacitance numerical coding of discharge time; Can know that according to the numerical coding of being resolved time writer is not pressed, thereby on electronic whiteboard, not show any person's handwriting.
When nib was pressed, the capacitance Cx of variable capacitance can be within the specific limits changes with the variation of pressure.The variable capacitance pressure is big more, and capacitance Cx is big more, after Cx reaches maximal value, just no longer increases with the increase of pressure.When nib was pressed, prolonged the discharge time of variable capacitance, and the voltage on variable capacitance is lower than V
RefThe time, the processor control timer stops timing.This moment, the suffered force value of the timing that timer write down and nib is corresponding, and processor will be compiled as numerical coding corresponding to the timing of this force value, will comprise this digitally coded resonance signal again and send to electronic whiteboard.After electronic whiteboard receives and comprises this digitally coded resonance signal, parse corresponding with the force value variable capacitance said numerical coding of discharge time, and demonstrate the person's handwriting state of corresponding thickness according to the numerical coding of being resolved.
Because suffered pressure is different; Different variable capacitances is corresponding to different discharge time constants
; Also just corresponding to different discharge times; Therefore; Processor all can obtain according to the timing of timer and real-time pressure corresponding discharge time in each discharges and recharges the cycle.These data are processed device and are compiled as and the corresponding numerical coding of different pressures value, will comprise this digitally coded resonance signal through resonant circuit again and send to electronic whiteboard.Electronic whiteboard will obtain a series of variable capacitance digitally coded resonance signals of discharge time that comprise like this; Said resonance signal resolved obtain the corresponding variable capacitance numerical coding of discharge time; Through after the Computer Processing, will demonstrate thickness degree and the corresponding person's handwriting lines of force value through electronic whiteboard.
Based on the structure of above-mentioned time writer, the present invention also provides a kind of pressure sensitivity control method of time writer, and is as shown in Figure 3, may further comprise the steps:
Step 301: discharge and recharge in the cycle at one, record time writer inner discharge time with the corresponding variable capacitance of nib pressure, and the resonance signal that will comprise information discharge time sends to electronic whiteboard;
In this step, said variable capacitance connects the non-writing end of time writer nib, and the suffered pressure variation of nib changed when the capacitance Cx ability basis of variable capacitance was write.Particularly, when nib was under pressure, variable capacitance increased, and it is big that discharge time constant becomes, and prolong the discharge time of variable capacitance; Therefore, the suffered pressure of the discharge time of variable capacitance and nib has indirect corresponding relation, according to just can corresponding judging the suffered pressure size of nib the discharge time of variable capacitance.Time writer will be compiled as numerical coding with this force value corresponding discharge time, will comprise this digitally coded resonance signal again and send to electronic whiteboard.
Preferably, be specially the discharge time of variable capacitance: when variable capacitance begins to discharge, until the magnitude of voltage of variable capacitance ends when being lower than preset threshold value voltage.
Step 302: electronic whiteboard is resolved received resonance signal, obtains and the nib numerical coding of the suffered corresponding variable capacitance of force value discharge time, and output and the corresponding person's handwriting state of this force value.
In this step, electronic whiteboard is resolved received resonance signal, obtains a series of variable capacitance numerical coding of discharge time, and wherein, the suffered pressure size of the numerical coding of parsing and nib is corresponding indirectly; Computing machine will demonstrate thickness degree and the corresponding person's handwriting lines of said length discharge time through electronic whiteboard after the gained numerical coding is handled, and has also obtained and the corresponding person's handwriting state of nib pressure value with regard to corresponding.
In addition; Preferably, with force value corresponding discharge time can also with the corresponding coding of other status informations on the time writer, for example; With force value corresponding discharge time and the corresponding codings of status information such as person's handwriting color, and send electronic whiteboard to through the mode of digital transmission.In addition; Pressure detection module of the present invention can be used with functions of shortcut key on the pen jointly; Difference according to the shortcut corresponding function; Way of realization is the lines Presentation Function of horn of plenty more, for example: except that can making real-time demonstration line weight difference or color difference, can also make that the line color degree of depth is different, color background is not equal.
In scheme according to the invention, variable capacitance not only can pressure sensor, also has clear and definite electric capacity initial value, and is highly sensitive, only needs contact gently to get final product pressure sensor when writing, and writes natural and trippingly, improved user's experience.
Claims (10)
1. a time writer that is used for electronic whiteboard is characterized in that, said time writer comprises: nib, variable capacitance and processor; Wherein,
Variable capacitance connects the non-writing end of time writer nib, and when writing the suffered pressure real time altering capacitance of nib;
Processor is used to control variable capacitance and periodically discharges and recharges, and according to discharge time of the corresponding variable capacitance of nib pressure, the control time writer sends the electromagnetic signal that comprises variable capacitance information discharge time to electronic whiteboard.
2. time writer according to claim 1 is characterized in that, said time writer also comprises: timer and voltage comparator;
Said voltage comparator is used for the magnitude of voltage and the preset threshold value magnitude of voltage of variable capacitance are compared, and when the magnitude of voltage of variable capacitance is lower than the preset threshold value magnitude of voltage, to processor output switching activity signal;
Timer, the discharge time that is used under the control of processor, writing down variable capacitance; Be specially: when variable capacitance began to discharge, timer picked up counting; When processor received the energizing signal of voltage comparator, timer stopped timing.
3. time writer according to claim 2 is characterized in that, said processor carries out numerical coding the discharge time of the variable capacitance that also is used for timer is write down.
4. time writer according to claim 3 is characterized in that, said time writer also comprises: resonant circuit, current rectifying and wave filtering circuit resonant on-off circuit;
Resonant circuit is used for when nib during near electronic whiteboard, and the electromagnetic signal of sending according to electronic whiteboard induces resonance signal, and sends to current rectifying and wave filtering circuit;
Current rectifying and wave filtering circuit, the resonance signal that is used for that resonant circuit is responded to carry out rectifying and wave-filtering to be handled, and converts DC voltage into and send to processor, for processor provides working power;
The resonant switch circuit is used for the numerical coding of said processor output is affacted the resonance signal that resonant circuit is sensed, and will comprise said digitally coded resonance signal through resonant circuit and send to electronic whiteboard.
5. according to each described time writer of claim 1 to 4; It is characterized in that; Said time writer also comprises function button; Said processor also is used for the status information of function button, variable capacitance are compiled into the string number coding discharge time, and will comprise this a string digitally coded resonance signal and send to electronic whiteboard.
6. the pressure sensitivity control method of a time writer is characterized in that, this method comprises:
Non-writing end at the time writer nib connects variable capacitance, and when writing the suffered pressure real time altering capacitance of nib;
Discharge and recharge in the cycle at one, record time writer inner discharge time with the corresponding variable capacitance of nib pressure value, and the resonance signal that will comprise variable capacitance information discharge time sends to electronic whiteboard.
7. method according to claim 6 is characterized in that, be the discharge time of said variable capacitance: when variable capacitance begins to discharge, when the magnitude of voltage of variable capacitance is lower than the preset threshold value magnitude of voltage, end.
8. according to claim 6 or 7 described methods; It is characterized in that; The said resonance signal that will comprise variable capacitance information discharge time sends to electronic whiteboard; Be specially: will be compiled as numerical coding with the discharge time of the corresponding variable capacitance of said force value, will comprise said digitally coded resonance signal again and send to electronic whiteboard.
9. method according to claim 8; It is characterized in that; Said resonance signal sends to after the electronic whiteboard; This method also comprises: electronic whiteboard is resolved received resonance signal, obtain and the corresponding variable capacitance of the nib pressure value numerical coding of discharge time, and according to said numerical coding output and the corresponding person's handwriting state of this force value.
10. method according to claim 6; It is characterized in that; This method also comprises: the status information of function button on the time writer, variable capacitance are compiled into the string number coding discharge time, and will comprise this a string digitally coded resonance signal and send to electronic whiteboard.
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| CN201110054307.6A CN102681677B (en) | 2011-03-08 | 2011-03-08 | For time writer and the pressure sensitivity control method thereof of electronic whiteboard |
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| CN103853413A (en) * | 2012-11-28 | 2014-06-11 | 联想(北京)有限公司 | Information processing method and device |
| CN104035581A (en) * | 2013-03-08 | 2014-09-10 | 太瀚科技股份有限公司 | Control method of electromagnetic pen |
| CN104156088A (en) * | 2013-05-14 | 2014-11-19 | 汉王科技股份有限公司 | Active capacitance pen and touch control device |
| US9459711B2 (en) | 2013-03-06 | 2016-10-04 | Wacom Co., Ltd. | Pointer control method |
| CN106775007A (en) * | 2016-11-24 | 2017-05-31 | 广东小天才科技有限公司 | The display methods and electronic blackboard of electronic blackboard |
| CN107491229A (en) * | 2016-06-10 | 2017-12-19 | 株式会社日本显示器 | Input detection device and electronic installation |
| CN108540111A (en) * | 2018-02-09 | 2018-09-14 | 上海与德科技有限公司 | Pressure detection circuit and electronic equipment |
| CN109387306A (en) * | 2017-08-14 | 2019-02-26 | 群光电子股份有限公司 | Strength detection method and touch device |
| CN110096167A (en) * | 2019-05-10 | 2019-08-06 | 鲁伯特（北京）教育科技有限公司 | A kind of LC resonance circuit of time writer and the method for proposing high q-factor |
| CN113539017A (en) * | 2021-06-24 | 2021-10-22 | 杭州优必学科技有限公司 | Modular programming building block capable of being placed at will and control method |
| CN114822113A (en) * | 2022-02-25 | 2022-07-29 | 杭州小伴熊科技有限公司 | Drawing teaching system for online education |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103853413A (en) * | 2012-11-28 | 2014-06-11 | 联想(北京)有限公司 | Information processing method and device |
| CN103853413B (en) * | 2012-11-28 | 2017-06-27 | 联想(北京)有限公司 | A kind of method and device of information processing |
| US9459711B2 (en) | 2013-03-06 | 2016-10-04 | Wacom Co., Ltd. | Pointer control method |
| CN104035581B (en) * | 2013-03-08 | 2016-12-28 | 株式会社和冠 | Time writer control method |
| CN104035581A (en) * | 2013-03-08 | 2014-09-10 | 太瀚科技股份有限公司 | Control method of electromagnetic pen |
| CN104156088A (en) * | 2013-05-14 | 2014-11-19 | 汉王科技股份有限公司 | Active capacitance pen and touch control device |
| CN107491229A (en) * | 2016-06-10 | 2017-12-19 | 株式会社日本显示器 | Input detection device and electronic installation |
| CN106775007A (en) * | 2016-11-24 | 2017-05-31 | 广东小天才科技有限公司 | The display methods and electronic blackboard of electronic blackboard |
| CN106775007B (en) * | 2016-11-24 | 2020-01-03 | 广东小天才科技有限公司 | Display method of electronic blackboard and electronic blackboard |
| CN109387306A (en) * | 2017-08-14 | 2019-02-26 | 群光电子股份有限公司 | Strength detection method and touch device |
| CN108540111A (en) * | 2018-02-09 | 2018-09-14 | 上海与德科技有限公司 | Pressure detection circuit and electronic equipment |
| CN110096167A (en) * | 2019-05-10 | 2019-08-06 | 鲁伯特（北京）教育科技有限公司 | A kind of LC resonance circuit of time writer and the method for proposing high q-factor |
| CN113539017A (en) * | 2021-06-24 | 2021-10-22 | 杭州优必学科技有限公司 | Modular programming building block capable of being placed at will and control method |
| CN114822113A (en) * | 2022-02-25 | 2022-07-29 | 杭州小伴熊科技有限公司 | Drawing teaching system for online education |
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