CN102331897B - Electromagnetic induction-type electronic whiteboard system capable of being written by multiple people synchronously - Google Patents
Electromagnetic induction-type electronic whiteboard system capable of being written by multiple people synchronously Download PDFInfo
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Abstract
The invention provides an electromagnetic induction-type electronic whiteboard system capable of being written by multiple people synchronously. The electromagnetic induction-type electronic whiteboard system capable of being written by multiple people synchronously comprises a board body capable of detecting an only combined area of a built-in conductive metal wire array, a multi-way select switch circuit, a signal filtering and separating circuit, at least two signal amplifying circuits connected with the signal filtering and separating circuit, and a multi-way analog switch connected with the signal amplifying circuits, which are sequentially connected, wherein the multi-way analog switch is connected with a signal frequency detection circuit and a peak keeping and sampling circuit which are connected with a singlechip; and the singlechip is connected with at least one of a wireless communication module or a USB (universal serial bus) communication module. The electromagnetic induction-type electronic whiteboard system capable of being written by multiple people synchronously is low in production cost, easy and convenient to manufacture, high in writing precision, high in calligraph recognizing procession and high in response speed and supports synchronous writing of multiple people.
Description
[technical field]
The present invention relates to a kind of electric whiteboard system, particularly relate to the electric whiteboard system that a kind of many people synchronously write.
[background technology]
Conventional teaching generally makes water write straight being connected on plate body to write with the blank of training use, for classroom notes, be very disadvantageous with the file of minutes, the integrality and the accuracy that are difficult to guarantee information, interactive electric whiteboard produces thus, for solving the complete and accurate storage of information.
Interactive electric whiteboard mainly contains pressure-sensitive, infrared type, infrared excess sound wave type, traditional electrical magnetic-type technology, and pressure-sensitive electronic whiteboard is owing to adopting two-layer resistive film structure, and face is extremely soft, fragilely causes whole plate body normally to use; Infrared electronic white adopts intensive infrared tube structure, and complex structure, cost are high, and short feature of infrared tube life-span, cause the whole blank life-span also to shorten; The poor anti jamming capability of infrared excess sound wave type electronic whiteboard to neighbourhood noise, writes precision low.
Tradition electromagnetic electronic white board antijamming capability is strong, long service life, but write, precision is low, reaction velocity slow, cannot support the features such as many people synchronously write, so can not replace the electronic whiteboard that adopts other technologies completely.
[summary of the invention]
The technical problem to be solved in the present invention, is to provide a kind of induction many people synchronously to write electric whiteboard system, and it can realize the function of supporting that many people synchronously write.
The present invention is achieved in that a kind of induction many people synchronously write electric whiteboard system, it comprises: the plate body that detects the unique combination zone of built-in conducting metal linear array connecting successively, multidiameter option switch circuit, signal filtering separation circuit, at least two signal amplification circuits that are connected with signal filtering separation circuit, the multiway analog switch being connected with signal amplification circuit, described multiway analog switch is connected respectively to signal frequency testing circuit, peak value keeps sample circuit, described signal frequency testing circuit, peak value keeps sample circuit to be all connected to single-chip microcomputer, described single-chip microcomputer is connected at least one of wireless communication module or usb communication module, in described plate body, be provided with conducting metal linear array, the X-direction of described conducting metal linear array and Y direction are provided with the conductive metal wire of the tape insulation layer of plural groups closure, each group conductive metal wire by a conductive metal wire repeatedly roundabout coiling form, the corresponding ID of each group conductive metal wire, does not repeat the ID permutation and combination of conductive metal wire in any surveyed area of electronic pen, the equal correspondence of each group conductive metal wire of X-direction or Y direction is provided with set of number, take at least 2 adjacent numerals as a permutation and combination, according to the surveyed area of electronic pen, determine the quantity of a permutation and combination, the conductive metal wire of described numeral combines according to arbitrary arrangement the side that unduplicated mode is arranged in plate body, the spacing of adjacent two digital conductive metal wires is equal, and described conductive metal wire carries out cabling according to corresponding numeral, that is, step 1: described each group conductive metal wire moves the offside that arrives plate body from the position of first corresponding numeral, then described in mobile arrival interval the position of the digital conductive metal wire of permutation and combination quantity few one again cabling get back to an initial side, step 2: then this conductive metal wire moves and arrives next this digital position, the more mobile offside that arrives plate body, then described in mobile arrival interval the position of the digital conductive metal wire of permutation and combination quantity few one again cabling get back to an initial side, repeat above-mentioned two steps until this conductive metal wire approaches the edge of plate body is that cabling finishes, every group of conductive metal wire cabling finishes rear being all connected on single line and is connected to earth terminal, completes closed coiling, described single-chip microcomputer is provided with the array corresponding with conducting metal linear array.
Further, described conductive metal wire is copper cash, and the spacing of two adjacent groups conductive metal wire equates.
Tool of the present invention has the following advantages: have production cost low, manufacture easy, write precision high, write that accuracy of identification is high, reaction velocity is fast, support the features such as many people synchronously write.
[accompanying drawing explanation]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the module frame chart that the induction many people of the present invention synchronously write electric whiteboard system.
Fig. 2 is the cabling schematic diagram of conducting metal linear array one embodiment in the plate body in Fig. 1.
Fig. 3 is the multidiameter option switch circuit in Fig. 1.
Fig. 4 a is the signal filtering separation circuit in Fig. 1.
Fig. 4 b is that signal is through the filtered Bode diagram of LC π type.
Fig. 5 is amplifying circuit and the multi-channel analog switch circuit in Fig. 1.
Fig. 6 is the signal frequency testing circuit in Fig. 1.
Fig. 7 is that the peak value in Fig. 1 keeps sample circuit.
Fig. 8 is the single chip circuit in Fig. 1.
Fig. 9 is the usb communication modular circuit in Fig. 1.
[embodiment]
A kind of induction many people of the present invention synchronously write electric whiteboard system, it comprises: the plate body that detects the unique combination zone of built-in conducting metal linear array connecting successively, multidiameter option switch circuit, signal filtering separation circuit, at least two signal amplification circuits that are connected with signal filtering separation circuit, the multiway analog switch being connected with signal amplification circuit, described multiway analog switch is connected respectively to signal frequency testing circuit, peak value keeps sample circuit, described signal frequency testing circuit, peak value keeps sample circuit to be all connected to single-chip microcomputer, described single-chip microcomputer is connected at least one of wireless communication module or usb communication module.
The time writer that the present invention uses is built-in with sine wave generating circuit, by the coil of electromagnetism nib, can launch the electromagnetic wave signal of fixed amplitude different frequency, when on whiteboard face, many people synchronously write, blank plate body can receive the electromagnetic wave signal that difference is write frequency.
The built-in conducting metal linear array of plate body of the present invention.In described plate body, be provided with conducting metal linear array, the X-direction of described conducting metal linear array and Y direction are provided with the conductive metal wire of the tape insulation layer of plural groups closure, each group conductive metal wire by a conductive metal wire repeatedly roundabout coiling form, the corresponding ID of each group conductive metal wire, does not repeat the ID permutation and combination of conductive metal wire in any surveyed area of electronic pen.Described X-direction is identical with the winding mode of the conductive metal wire of Y direction.The winding mode of conductive metal wire: take arbitrary axle as example, the equal correspondence of each group conductive metal wire is provided with set of number, take at least 2 adjacent numerals as a permutation and combination, according to the surveyed area of electronic pen, determine the quantity of a permutation and combination, the conductive metal wire of described numeral combines according to arbitrary arrangement the side that unduplicated mode is arranged in plate body, and the spacing of adjacent two digital conductive metal wires equates.Described conductive metal wire carries out cabling according to corresponding numeral,, step 1: described each group conductive metal wire moves the offside that arrives plate body from the position of first corresponding numeral, then described in mobile arrival interval the position of the conductive metal wire of few one of permutation and combination quantity again cabling get back to an initial side; Step 2: then this conductive metal wire moves and arrives next this digital position, the more mobile offside that arrives plate body, then described in mobile arrival interval the position of the conductive metal wire of few one of permutation and combination quantity again cabling get back to an initial side; Repeat above-mentioned two steps until this conductive metal wire approaches the edge of plate body is that cabling finishes; Every group of conductive metal wire cabling finishes rear being all connected on single line and is connected to earth terminal, completes closed coiling.
Described conductive metal wire can adopt copper cash, the electromagnetic wave signal that time writer sends changes the magnetic flux in closed copper mesh array loop, at copper mesh, just produced induced current, induced current is connected to signal acquisition process control card by the interface block on blank plate body.The electromagnetic wave signal that the time writer that signal acquisition process control card receives the electronic whiteboard body of built-in copper mesh array network sends receives, convert induced current to the signal acquisition module of control card, the signal filtering separation circuit of signal acquisition process control card carries out separating treatment to signal, the signal of different frequency scope is carried out to separation, signal after separation carries out the multistage amplification of signal through signal amplification circuit separately, signal after amplification enters multiway analog switch, the signal that multiway analog switch selects the signal of certain frequency to carry out final stage is processed, signal processing comprises by signal frequency testing circuit carries out frequency detecting, and the peak value sampling that keeps sample circuit to carry out waveform by peak value keeps, single-chip microcomputer on signal acquisition process control card complete time writer send out frequency computation part with and obtain the voltage of the peak value of waveform, and by frequency with and the peak value of waveform calculate the absolute location coordinates of time writer on blank finally by wireless module or USB communication with wireless, wired mode obtains the absolute location coordinates of time writer on blank signal acquisition process control card and sends to computer.Described in the present embodiment, conductive metal wire is copper cash.
It is example that the present embodiment be take the electric whiteboard system that two people can synchronously write.
Referring to Fig. 1, be that these induction many people synchronously write electric whiteboard system, it comprises: two time writers 1, the electronic whiteboard body 2 of built-in copper mesh array network, multidiameter option switch circuit 3, signal filtering separation circuit 4, signal amplification circuit 5, multiway analog switch 6, signal frequency testing circuit 7, peak values keep sample circuit 8, single-chip microcomputer 10, wireless module 9, usb communication module 11, PC12.Described plate body, multidiameter option switch, signal filtering separation circuit are linked in sequence, and described signal filtering separation circuit is connected respectively to two signal amplification circuits.Two signal amplification circuits are all connected to multiway analog switch, described multiway analog switch is connected respectively to signal frequency testing circuit 7, peak value keeps sample circuit 8, described signal frequency testing circuit 7, peak value keep sample circuit 8 to be all connected to single-chip microcomputer 10, described single-chip microcomputer 10 is connected to wireless communication module 9 and usb communication module 11, and described usb communication module 11 is connected to PC12.
Described plate body is built-in with copper mesh array, the X-direction of described copper mesh array and Y direction are provided with the tape insulation layer copper cash of plural groups closure, each group copper cash by a copper cash repeatedly roundabout coiling form, the corresponding ID of each group copper cash, described X-direction is identical with the winding mode of the copper cash of Y direction, and the ID permutation and combination of copper cash in any surveyed area of electronic pen is not repeated.In the present embodiment, 3 adjacent copper cash are a permutation and combination.The winding mode of copper cash, take Y-axis as example, as shown in Figure 2: step 1: copper cash is moved to the left the left side that arrives Y-axis from digital 0 position, then moves up and arrives the position of two copper cash in interval; Step 2: copper cash moves right and arrives the right side of Y-axis, then copper cash moves up and arrives the position of next numeral 0; Step 3: repeating step 1, step 2, until approaching the coboundary of plate body, copper cash cannot continue to be moved to the left, copper cash is moved downward to the lower right corner of Y-axis; Step 4: from next group copper cash (i.e. numeral 1), repeating step 1, step 2, step 3, until copper cash is all around complete.The induction range of time writer used in the present invention is 5 copper cash left and right.When time writer is write on plate body, now time writer just can detect the region of a permutation and combination.Therefore system can detect the combination zone of 3 copper cash unique on plate body, thereby determines the physical location of time writer.
Referring to Fig. 3, it is the multidiameter option switch circuit of the present embodiment.This multidiameter option switch circuit directly connects the built-in copper mesh array network of plate body, the X-axis of copper mesh array network, Y-axis are drawn respectively one group of copper cash and a loop ground wire, one group of copper cash in X-axis is connected to U8 chip, U9 chip, U10 chip, U8 chip, U9 chip, U10 chip are 8 tunnels analogy MUX, chip enable pin EN with and address C, B, A for gating HEF4051 chip X0 to X7 pin, be connected to pin X.Address C, the B of 74HC138 chip, A control the pin that enables that Y0 to Y7 output is connected to HEF4051 chip.By address C, B, A and HEF4051 address C, B, the A of 74HC138 chip, can select any X output pin that is connected to HEF4051 chip of X0 to X19 and these 40 lines of Y0 to Y19, output Sign signal, Sign signal is the sinusoidal wave electromagnetic signal that time writer that copper mesh receives sends certain frequency.
Referring to Fig. 4 a, it is the signal filtering separation circuit of the present embodiment, the sinusoidal wave electromagnetic signal Sign signal that receives certain frequency enters respectively two RC circuit and carries out low-pass filtering, the high frequency interference composition filtering in signal, and respectively through two in-phase proportion amplifier U6B, U7B, signal amplify (1+R19/R21) with and (1+R25/R27) doubly, enter respectively LC π type filtering circuit, referring to Fig. 4 b, be that signal is through the filtered Bode diagram of LC π type, in Bode diagram XBP1, signal forms the logical waveform of band of 20dB-23dB at 200KHZ-240KHZ, and signal forms trap waveform at 200KHZ-240KHZ in Bode diagram XBP2, in Bode diagram XBP1, signal forms trap waveform at 340KH-380KHZ, and signal forms the logical waveform of band of 20dB-24dB in Bode diagram XBP2 at 340KHZ-380KHZ, signal enters respectively after the filtering of LC π type as can be seen here, be separated into two kinds of height frequency signals of 200KHZ-240KHZ and 340KHZ-380KHZ, just in time corresponding two time writers send electromagnetic two kinds of different frequencies, separated high frequency low-frequency signals enters RC circuit and carries out high-pass filtering, filtering low-frequency interference signal, pass through again in-phase proportion amplifier U6A, U7A, obtain respectively signal Signal_L and Signal_H.
Referring to Fig. 5, signal amplification circuit and the multi-channel analog switch circuit of the present embodiment, signal Signal_L and Signal_H enter multi-channel analog switch circuit, by control signal Select_signal, select signal Signal_L and Signal_H whether to export in Zmix, Zmix signal enters RC circuit to carry out entering in-phase proportion amplifier U4A after high-pass filtering and again carries out signal amplification, obtains signal GAIN_OUT.
Referring to Fig. 6, it is the signal frequency testing circuit of the present embodiment, adopt comparer LM393M, signal is carried out to voltage ratio, the pin 2 of comparer LM393M is added in anti-phase input end for reference voltage directly connects, GAIN_OUT signal is directly added in the input end of the homophase of comparer, at output pin LM393_OUT, obtains the signal that pulsed frequency is identical with input end.
Referring to Fig. 7, the peak value that is the present embodiment keeps sample circuit, the signal GAIN_OUT of multi-channel analog switch circuit and signal amplification circuit output, wherein a road is connected to the frequency of signal frequency testing circuit detection signal, another road is connected to peak value and keeps sample circuit, signal GAIN_OUT is connected with the base stage of triode Q1 through resistance R 15, and the base stage of triode Q1 is drawn biasing on being undertaken by 13 pairs of signal voltages of resistance R, at the peak value of emitter output signal.The base stage of triode Q2 is the control signal ADC_EN of single-chip microcomputer output, its grounded emitter, when ADC_EN is high level, triode Q2 conducting, the peak signal of triode Q1 emitter output is directly connected to ground by triode Q2, and by resistance R 16, does not export; When ADC_EN is low level, triode Q2 cut-off, the peak signal of triode Q1 emitter output can be carried out filtering and be passed through resistance R 16 by capacitor C 29, and capacitor C 30 is carried out RC filtering output signal peak A DC_IN, the maintenance of settling signal peak value.Signal peak ADC_IN is connected to AD module numeral conversion chip U1, obtains the voltage of signal peak, and data transfer to single-chip microcomputer by D1-D8 data line, and the peak value of settling signal keeps and sampling.
Referring to Fig. 8, be the present embodiment single chip circuit, this is the processing core of system, completes the control of multidiameter option switch circuit in electronic whiteboard body, the calculating of signal frequency, the reading of signal peak, and the calculating of final coordinate with communicate by letter.The P2 port of single-chip microcomputer U14 is set to output, by array, table look-up the numerical value pre-setting is delivered to output port P2 for selecting the gating address of multidiameter option switch circuit in electronic whiteboard body, can independently select any wire in X-axis or Y-axis, gating address is first from Y0 to Y19, when time writer is write on blank, in the Y-axis of the built-in copper mesh array network of blank, at least 3 copper cash can receive electromagnetic wave signal, and convert induction current to, export signal filtering separation circuit to, signal is separated, if what time writer sent is high-frequency electromagnetic wave signal, signal can only divide at high-frequency passage by filtered separation circuit, if what time writer sent is low frequency electromagnetic wave signal, signal can only divide at low frequency passage by filtered separation circuit.Less by signal amplitude after filtering separation circuit, must carry out signal amplification through operational amplifier.
Single-chip microcomputer output control signal Select_signal selects high-frequency or low frequency timesharing to enter analog switching circuit, and send into operational amplifier and amplify and obtain GAIN_OUT, GAIN_OUT sends into signal frequency testing circuit and carries out signal conversion by comparer, obtains the frequency that the frequency LM393_OUT of pulse sends with time writer consistent.The counter that LM393_OUT is input to single-chip microcomputer interrupts the counting that carries out pulse, in the time of step-by-step counting, open timer in single-chip microcomputer and interrupt carrying out timing, when timer regularly reaches 1 millisecond, calculate the number of pulse, when the frequency that time writer sends is 200KHZ, single-chip microcomputer can receive about 400 pulses, so just can count the frequency of the electromagnetic wave signal that time writer sends, according to obtaining different signal frequencies, can judge it is which time writer is at the enterprising running hand write operation of blank, and can obtain the state of time writer, such as time writer, now write state or key-press status etc.
Another road signal of GAIN_OUT is sent into peak value and is kept sample circuit, ADC_EN control signal is for closing or the peak value of holding signal, and export control signal CLK and OE to AD conversion chip and carry out the simulation of signal peak to the conversion of data-signal, and the peak of output is outputed to the input port P0 of single-chip microcomputer.
The gating address that single-chip microcomputer sends is first from Y0 to Y19, again from X0 to X19, when time writer is when blank is submitted a written statement to a higher authority write operation, in the Y-axis of the built-in copper mesh array network of blank or X-axis, at least 3 copper cash can receive electromagnetic wave signal, the electromagnetic wave signal that time writer sends is the sine wave signal of alternation, the electromagnetic wave signal energy that Qie sends at center is the strongest, the electromagnetic wave signal intensity approximately linear sending away from center successively decreases, the address at the peak value of first detection signal and Second Largest Value and Second Largest Value place in Y-axis, tabled look-up in these three addresses in array, and the position of the peak value that obtains signal in array, and in this array position and former and later two addresses, this position, again carry out the gating address of copper mesh array network on blank, the frequency of detection signal and the range value of signal, if the address at signal peak place is ADDR, the range value of the signal that last address detects of peak value address is a, the range value of peak value signal that address detects is b, the range value of a rear signal that address detects of peak value address is c, if address is amplified to 100 times, pass through formula:
100*ADDR+100*((a-b)/((a-b)+(a-c))
Can obtain the absolute location coordinates of time writer in blank copper mesh array network.X-axis is consistent with the step of detection in Y-axis and coordinates computed.
When the time writer of two unlike signal frequency ranges is write on blank, first by filtered separation circuit, be separated into independently signal of two-way, and by single-chip microcomputer, export control signal Select_signal and select high-frequency or low frequency timesharing to enter analog switching circuit, by the separation of filtering separation circuit with and the timesharing of single-chip microcomputer select can be completely separated the signal of two time writers, the disposal route of two time writers is identical.Obtaining the absolute location coordinates of time writer in blank copper mesh array network exports data by serial ports.
Referring to Fig. 9, it is the usb communication modular circuit of the present embodiment, single-chip microcomputer obtains the absolute location coordinates data of time writer in blank copper mesh array network after processing and exports by serial ports, and be connected to the C8051F321 single-chip microcomputer with USB controller, C8051F321 receives serial data data is processed, can select whether to be with wireless data transmission function by wire jumper J2, C8051F321 connects CC2500 (2.4GHZ) radio frequency chip, by SPI, control CC2500 chip the coordinate data packing receiving is transmitted into the wireless interface receiving end of PC by CC2500, also can be typically wire connected to PC by C8051F321 single-chip microcomputer, coordinate data packing is transmitted at full speed and exported to PC by USB2.0, finally complete the function that electric whiteboard system can obtain the absolute location coordinates of time writer in blank copper mesh array network and transfer to PC.
By above step, complete induction many people and synchronously write electric whiteboard system.
The above, only for preferred embodiment of the present invention, therefore can not limit according to this scope of the invention process, the equivalence of doing according to the scope of the claims of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (3)
1. induction many people synchronously write electric whiteboard system, it is characterized in that: it comprises: the plate body that detects the unique combination zone of built-in conducting metal linear array connecting successively, multidiameter option switch circuit, signal filtering separation circuit, at least two signal amplification circuits that are connected with signal filtering separation circuit, the multiway analog switch being connected with signal amplification circuit, described multiway analog switch is connected respectively to signal frequency testing circuit, peak value keeps sample circuit, described signal frequency testing circuit, peak value keeps sample circuit to be all connected to single-chip microcomputer, described single-chip microcomputer is connected at least one of wireless communication module or usb communication module,
In described plate body, be provided with conducting metal linear array, the X-direction of described conducting metal linear array and Y direction are provided with the conductive metal wire of the tape insulation layer of plural groups closure, each group conductive metal wire by a conductive metal wire repeatedly roundabout coiling form, the corresponding ID of each group conductive metal wire, does not repeat the ID permutation and combination of conductive metal wire in any surveyed area of electronic pen;
The equal correspondence of each group conductive metal wire of X-direction or Y direction is provided with set of number, take at least 2 adjacent numerals as a permutation and combination, according to the surveyed area of electronic pen, determine the quantity of a permutation and combination, the conductive metal wire of described numeral combines according to arbitrary arrangement the side that unduplicated mode is arranged in plate body, the spacing of adjacent two digital conductive metal wires is equal, and described conductive metal wire carries out cabling according to corresponding numeral; That is, step 1: described each group conductive metal wire moves the offside that arrives plate body from the position of first corresponding numeral, then described in mobile arrival interval the position of the digital conductive metal wire of permutation and combination quantity few one again cabling get back to an initial side; Step 2: then this conductive metal wire moves and arrives next this digital position, the more mobile offside that arrives plate body, then described in mobile arrival interval the position of the digital conductive metal wire of permutation and combination quantity few one again cabling get back to an initial side; Repeat above-mentioned two steps until this conductive metal wire approaches the edge of plate body is that cabling finishes; Every group of conductive metal wire cabling finishes rear being all connected on single line and is connected to earth terminal, completes closed coiling;
Described single-chip microcomputer is provided with the array corresponding with conducting metal linear array.
2. a kind of induction many people according to claim 1 synchronously write electric whiteboard system, it is characterized in that: the spacing of two adjacent groups conductive metal wire equates.
3. a kind of induction many people according to claim 2 synchronously write electric whiteboard system, it is characterized in that: described conductive metal wire is copper cash.
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| CN201110284712.7A CN102331897B (en) | 2011-09-22 | 2011-09-22 | Electromagnetic induction-type electronic whiteboard system capable of being written by multiple people synchronously |
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| CN201110284712.7A CN102331897B (en) | 2011-09-22 | 2011-09-22 | Electromagnetic induction-type electronic whiteboard system capable of being written by multiple people synchronously |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103425379A (en) * | 2012-05-25 | 2013-12-04 | 福建宝格丽电子科技有限公司 | Interactive electromagnetic whiteboard |
| CN105278794B (en) * | 2014-06-20 | 2019-11-15 | 鸿合科技股份有限公司 | The synchronous hand-written recognition method of more people based on electromagnetic whiteboard, device and time writer |
| CN106886348A (en) * | 2016-12-29 | 2017-06-23 | 上海清之泓教育科技有限公司 | Interactive electric whiteboard based on DSP digital processing units |
| CN108808870B (en) * | 2018-06-25 | 2020-07-28 | 研创光电科技（赣州）有限公司 | Wireless charging control system based on NFC technology and control method thereof |
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| CN201749444U (en) * | 2010-08-18 | 2011-02-16 | 温州育才实业有限公司 | Screen-expandable electronic whiteboard |
| CN201876859U (en) * | 2010-12-10 | 2011-06-22 | 福州锐达数码科技有限公司 | Electronic whiteboard with dual-stylus writing function |
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| CN102331897A (en) | 2012-01-25 |
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