WO2003056417A1 - An electronic whiteboard having flexibility membrane electromagnet induction generating device - Google Patents

An electronic whiteboard having flexibility membrane electromagnet induction generating device Download PDF

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Publication number
WO2003056417A1
WO2003056417A1 PCT/CN2002/000533 CN0200533W WO03056417A1 WO 2003056417 A1 WO2003056417 A1 WO 2003056417A1 CN 0200533 W CN0200533 W CN 0200533W WO 03056417 A1 WO03056417 A1 WO 03056417A1
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WO
WIPO (PCT)
Prior art keywords
electromagnetic induction
generating device
flexible diaphragm
type electromagnetic
layer
Prior art date
Application number
PCT/CN2002/000533
Other languages
English (en)
French (fr)
Inventor
Xuanming Shi
Original Assignee
Tai Guen Enterprise Co.,Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tai Guen Enterprise Co.,Ltd filed Critical Tai Guen Enterprise Co.,Ltd
Priority to KR1020047010321A priority Critical patent/KR100655511B1/ko
Priority to EP02754157A priority patent/EP1471411A4/en
Priority to US10/500,479 priority patent/US7499034B2/en
Priority to JP2003556874A priority patent/JP2005513669A/ja
Priority to AU2002323822A priority patent/AU2002323822A1/en
Publication of WO2003056417A1 publication Critical patent/WO2003056417A1/zh

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers

Definitions

  • the invention relates to an electronic whiteboard, in particular to an electronic whiteboard with a flexible diaphragm-type electromagnetic induction generating device, which is low in cost, easy to manufacture, and has high recognition accuracy. It belongs to the field of electronic technology. Background technique
  • the existing electronic whiteboard has a large sensing area or cannot be produced, for example, the corrosion of a printed circuit board is used to make an electromagnetic induction type; or because the cost is too high, a resistive induction structure such as a touch screen cannot be used, so the electronic whiteboard cannot be like a handwriting board. The same is used to determine the position where the instruction occurs by using a resistive, inductive or other induction generating device, and the cursor is moved.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and provide an electronic whiteboard with a flexible diaphragm-type electromagnetic induction generating device, which has low cost, simple production and manufacturing, and high accuracy of data collection and identification.
  • Another object of the present invention is to provide an electronic whiteboard with a flexible diaphragm-type electromagnetic induction generator, which has a long service life and a simple maintenance.
  • the purpose of the present invention is achieved as follows: An electronic whiteboard with a flexible diaphragm-type electromagnetic induction generating device, which at least includes an input induction zone, an identification control circuit, and a signal output device.
  • the surface is a writing layer and the bottom layer is The cover body, the electronic whiteboard body with a frame around it, and the input pen.
  • the sensing area is composed of a cover layer, an electromagnetic induction generating layer, and a bottom supporting bracket.
  • the base layer of the electromagnetic induction generating layer is an insulating flexible diaphragm, and an electromagnetic induction receiving antenna array is printed on the surface of the diaphragm to form a flexible diaphragm electromagnetic induction generating layer.
  • the output of this layer is connected to the control recognition circuit, and the input pen is provided with an electromagnetic wave generating device.
  • the control identification circuit is arranged on the printed circuit board PCB. Because the materials are different, the control circuit setting area is physically separated from the induction area. In this way, the antenna output terminal of the flexible diaphragm-type electromagnetic induction breeding layer is crimped or inserted or soldered to the printed circuit On the corresponding input pins of the board PCB.
  • the electromagnetic induction receiving antenna array is an induction antenna unit distributed along the X-axis and Y-axis directions.
  • the inductive antenna unit is circular or linear.
  • the induction antenna units are printed on both sides of the diaphragm surface.
  • one or more layers of X-axis and Y-axis induction antenna units are printed on two sides of the diaphragm surface, and each layer is insulated from each other.
  • the interval size can be the same or different.
  • the induction antenna unit is a silver paste or a silver paste carbon paste shield. '.
  • a shielding layer can be provided behind the electromagnetic induction generating layer.
  • a pressure sensor in the Z-axis direction may be provided at the rear of the pen tip of the input pen, and the output of the sensor is connected to the control end of the electromagnetic wave generating device. In this way, the transmitted signal of the electromagnetic wave is changed by pressing, which is more accurate. Ground to identify the input signal.
  • the signal output device is a wired cable connection device or a wireless data exchange device.
  • the wired cable connection device is a USB connector
  • the wireless data exchange device is a radio frequency transmitter / receiver.
  • the diaphragm can be a film shield. According to the analysis of the above technical solution, it can be known that the structure of the present invention is simple and reasonable, and the manufacturing process is simple, greatly The cost of the electronic whiteboard is reduced, and the sensing accuracy is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic diagram of the three-dimensional structure of the present invention
  • FIG. 2 is a block diagram of a circuit configuration of the present invention
  • FIG. 3 is a schematic structural diagram of an embodiment of a double-sided sensor array according to the present invention.
  • FIG. 4 is a three-dimensional exploded schematic view of an embodiment in which a multi-layered sensing array is provided on one side of the present invention
  • FIG. 5 is a schematic view of a hierarchical structure of the sensing area of the present invention. detailed description
  • the main body of the electronic whiteboard includes: a surface is a writing layer, a bottom support layer 7 is a cover, and an input sensing area 2 , an identification control circuit, and a signal are provided in the middle of the surface and the bottom layer.
  • the output device is provided with a frame 1 and a support 3 around the periphery, and of course an input pen.
  • the present invention is an electronic whiteboard with a flexible diaphragm-type electromagnetic induction generating device, which uses electromagnetic induction to complete signal acquisition input.
  • the induction circuit section includes an input induction zone, an identification control circuit, a signal output device, and an electromagnetic input pen with an electromagnetic generating device.
  • the sensing area is composed of a cover layer 6, an electromagnetic induction generating layer 4, and a bottom supporting layer 7.
  • a shielding layer 8 is provided between the electromagnetic induction generating layer 4 and the bottom supporting layer 7
  • the base layer of the electromagnetic induction generating layer 4 is an insulating flexible diaphragm 43, and the electromagnetic induction receiving antenna arrays 41 and 42 are printed on the surface of the diaphragm 43 to form a flexible diaphragm-type electromagnetic induction generating layer 4.
  • the inductive antenna unit is in the form of a loop or a straight line, distributed in an array, and interwoven, and printed on both sides of the diaphragm surface along the X-axis and Y-axis directions.
  • the horizontal direction of the bottom layer is the X-axis direction
  • the vertical direction of the top layer is the Y-axis direction, thus the coordinate system of the plane established in the sensing area.
  • more than one layer of X- and Y-axis induction antennas are printed on each side of the diaphragm surface and each layer is insulated from each other.
  • the diaphragm 41 may be made of ordinary film material.
  • the electromagnetic induction receiving antenna array is printed by silver paste or silver paste carbon paste mixed material.
  • the outputs of the electromagnetic induction receiving antenna arrays 41 and 42 are connected to a control identification circuit.
  • the control identification circuit is disposed on the printed circuit board PCB 5. Due to the different material shields, the control circuit installation area is physically separated from the induction area. In this way, the antenna output terminal of the flexible diaphragm electromagnetic induction generation layer 4 is crimped, Plug or solder to the corresponding input pins of the printed circuit board PCB 5. In order to facilitate installation and ensure the contact effect, it is best to use a crimping method, and an elastic pad is provided at the crimping contact surface.
  • the working mechanism of the present invention is:
  • the electromagnetic pen continuously emits electromagnetic signals.
  • the electromagnetic signal passes through a position of the induction antenna, and the antenna at this position induces the signal.
  • the induction generating device passes the induced position signal through the X and ⁇ direction leads.
  • the input port of the transmission control identification circuit is calculated by the CPU of the processing circuit through array gating, control method, band-pass filtering, detection rectification, and analog-to-digital conversion to determine the position coordinates and various working states of the electromagnetic signal at the induction antenna.
  • the communication interface is sent to the computer to control the computer to identify, display, record, etc.
  • a Z-axis pressure sensor is provided at the rear of the pen tip of the input pen, and the output of this sensor is connected to the control end of the electromagnetic wave generating device. In this way, the transmitted signal of the electromagnetic wave is changed by pressing, so that the pressure of the pen tip (input signal) can be identified more accurately.
  • the signal output device is a wired cable connection device or a wireless data exchange device.
  • the wired cable connection device is a cable with a USB connection port;
  • the wireless data exchange device is a radio frequency transmitter / receiver.
  • the signal output device is connected to a computer and / or printer, and the information collected on the whiteboard is directly edited and printed.
  • the signal output device is directly connected to a data storage device. After the data is stored, it can be imported into the computer using a mobile storage device. , Or other devices. Signal output device and peripheral equipment The body circuit structure is consistent with the connection method in consumer electronics applications in other fields, and will not be described here again.
  • the data sensed and output by the whiteboard of the present invention is the data after recognition, which is converted into data of the movement track of the pen, or is unrecognized data, which is position coordinate data of the pen at each time.
  • the above embodiments are only used to illustrate the present invention but not limitative.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Drawing Aids And Blackboards (AREA)
  • Facsimiles In General (AREA)
  • Position Input By Displaying (AREA)

Description

具有柔性隔膜式电磁感应发生装置的电子白板 技术领域 '
本发明涉及一种电子白板， 尤其是一种成本低、 制造简便并且识别精度高 的、 具有柔性隔膜式电磁感应发生装置的电子白板。 属于电子技术领域。 背景技术
随着电子技术的发展， 无论是在学校的授课环境，还是部门的研讨过程中， 越来越多的地方使用了电子白板。 这种产品能够及时地将书写在白板上的符 号， 转换为电信号， 输入给所连接的计算机， 通过计算机再直接完成编辑或打 印、传输等远程信息交换。 现有的电子白板由于感应面积较大， 或者不能制作， 例如印刷线路板的腐蚀制作电磁感应式； 或者由于成本太高， 而不能采用触摸 屏等电阻式的感应结构， 因此电子白板不能象手写板一样采用电阻式、 电感式 等感应发生装置来确定指令发生的位置， 移^光标， 而是采用输入笔与电子白 板之间的超声波发射、 接收方式进行操控， 其成本依然较高， 大大限制了这类 产品的应用。 所以， 现有产品存在着明显地识别率低， 精度差， 而且成本较高， 制造困难等缺点。 发明内容
本发明的目的在于克服现有技术之不足而提供一种具有柔性隔膜式电磁感 应发生装置的电子白板， 它成本较低、 生产制造简便， 而且数据采集识别的精 度高。
本发明的又一目的在于提供一种具有柔性隔膜式电磁感应发生装置的电子 白板， 使用寿命长， 维护筒单。 本发明的目的是这样实现的： 一种具有柔性隔膜式电磁感应发生装置的电 子白板， 它至少包括带有内部设有输入感应区、 识别控制电路、信号输出装置， 表面为书写层， 底层为盖体， 以及周边设有框架的电子白板本体， 还有输入笔。 其中感应区由覆盖层以及电磁感应发生层和底部支撑托层构成， 其中电磁感应 发生层的基层为绝缘柔性隔膜， 隔膜表面印制有电磁感应接收天线阵列， 构成 柔性隔膜式电磁感应发生层， 该层的输出接控制识别电路， 输入笔带有电磁波 发生装置。
控制识别电路设置在印刷线路板 PCB上， 由于材^不同， 因此控制电路设 置区域与感应区物理分离， 这样柔性隔膜式电磁感应爰生层的天线输出端压接 或插接或焊接在印刷线路板 PCB对应的输入引脚上。
具体地， 电磁感应接收天线阵列为沿 X轴、 Y轴方向分布的感应天线单元。 感应天线单元为环形或直线形。
感应天线单元分别印制在隔膜表面的两面上。 根据需要， 隔膜表面的两面 分别印制有一层或一层以上并且每层之间相互绝缘的 X轴、 Y轴的感应天线单 元； 一层以上所印制感应天线单元， 每层感应天线单元的间隔大小可以相同或 不同。
感应天线单元为银浆或银浆碳浆混合材盾。 ' .
为保障信号， 电磁感应发生层后可以设有屏蔽层。
为提高信号位置感应的准确性， 输入笔的笔尖后部可以设有 Z轴方向压力 传感器， 该传感器的输出接电磁波发生装置的控制端， 这样通过压触改变电磁 波的发射信号， 从而更为确切地识别输入信号。
• 所述的信号输出装置为有线电缆连接装置或无线数据交换装置。 有线电缆 连接装置为 USB连接器， 无线数据交换装置为射频发射 /接收器。
为降低成本、 便于制造， 隔膜可为菲林材盾。 根据上述技术方案分析可知， 本发明结构简单合理， 制作工艺简单， 大大 降低了电子白板的成本， 而且较大地提高了感应精度。 附图说明
图 1为本发明立体结构示意图；
图 2为本发明电路构成框图；
图 3为本发明双面设置感应阵列的实施例结构示意图；
图 4为本发明一面设置多层感应阵列的实施例立体分解结构示意图； 图 5为本发明感应区层次结构示意图。 具体实施方式
下面结合附图和具体实施方案对本发明做进一步地详细说明。
参见图 1、 5 , 为本发明立体结构示意图， 电子白板本体包括： 表面为书 写层， 底部支撑托层 7为盖体， 表面和底层中间的内部设有输入感应区 2、 识 别控制电路、 信号输出装置， 周边设有框架 1， 以及支架 3, 当然还有输入笔。
具体地， 如图 1、 2 所示， 本发明为一种具有柔性隔膜式电磁感应发生箏 置的电子白板， 它采用电磁感应的方式完成信号采集输入。 其感应电路部分包 括带有输入感应区、 识别控制电路、 信号输出装置， 以及带有电磁发生装置的 电磁输入笔。
如图 3、 4、 5所示， 其中感应区由覆盖层 6以及电磁感应发生层 4和底部 支撑托层 7构成， 有时， 为保障信号， 电磁感应发生层 4与底部支撑托层 7之 间设有屏蔽层 8。 其中电磁感应发生层 4的基层为绝缘柔性隔膜 43 , 隔膜 43 表面印制有电磁感应接收天线阵列 41、 42 ,构成柔性隔膜式电磁感应发生层 4。 感应天线单元为环形或直线形， 阵列形式分布， 交叉编织， 沿 X轴、 Y轴方向 印制在隔膜表面两面。 例如， 底层水平方向为 X轴方向， 顶层垂直方向为 Y轴 方向， 从而在感应区建立的平面的坐标系统。 当然为提高感应精度， 隔膜表面 两面分別印制有一层以上并且每层之间相互绝缘的 X轴、 Y轴方向的感应天线 单元， 而且一层以上印制的 X轴、 Y轴方向的各层感应天线单元的间隔大小不 同， 大小叠放后， 必然坐标的间隔缩小， 也就提高了感应的精度。 为降低成本、 便于制造， 隔膜 41 可为普通的菲林材质。 电磁感应接收天线阵列为银浆或银 浆碳浆混合材质印制而成。 电磁感应接收天线阵列 41、 42 的输出接控制识别 电路。
如图 3所示， 控制识别电路设置在印刷线路板 PCB 5上， 由于材盾不同， 因此控制电路设置区域与感应区物理分离， 这样柔性隔膜式电磁感应发生层 4 的天线输出端压接、 插接或焊接在印刷线路板 PCB 5对应的输入引脚上。 为便 于安装， 保障接触效果， 最好采用压接方式， 并且在压接接触面处设置弹性垫 片。
本发明的工作机理是：
电磁笔不断地发射电磁信号， 当笔尖触及感应发生装置时， 其电磁信号穿 过感应天线某位置， 该位置的天线感应出信号， 由感应发生装置将感应的位置 信号通过 X、 Υ 方向的引线传递控制识别电路的输入口， 经过阵列选通、 控制 方法、 带通滤波、 检波整流以及模数转换， 给处理电路的 CPU计算， 判定电磁 信号在感应天线的位置坐标和各种工作状态， 通过通信接口发送给计算机， 从 而控制计算机识别、 显示、 记录等。
再有， 为得到书写时笔尖的压力， 提高信号位置感应的准确性， 输入笔的 笔尖后部设有 Z轴方向压力传感器， 该传感器的输出接电磁波发生装置的控制 端。这样通过压触改变电磁波的发射信号，从而更为确切地识别笔尖的压力（输 入信号）。
另外， 信号输出装置为有线电缆连接装置或无线数据交换装置。 有线电缆 连接装置为具有 USB 连接口的电缆； 无线数据交换装置为射频发射 /接收器。 当然， 信号输出装置接计算机和 /或打印机， 直接将白板上感应采集的信息编 辑、 打印； 再有， 信号输出装置直接接数据存储设备， 可将数据存储后， 利用 移动存储装置导入到计算机中， 或其他设备中。 信号输出装置与周边设备的具 体电路结构与其他领域消费电子产品应用中的连接方式一致， 在此不再赞述。 本发明白板感应采集输出的数据为识别后数据， 转换为笔移动轨迹的数 据， 或者为未识别数据， 为笔的各时刻位置坐标数据。 以上实施例仅用以说明本发明而非限制， 尽管参照以上较佳实施例对本发 明进行了详细说明， 本领域的普通技术人员应当理解，可以对本发明进行修改、 变形或者等同替换， 而不脱离本发明的精神和范围， 其均应涵盖在本发明的权 利要求范围当中。

Claims

权 利 要 求
1、 一种具有柔性隔膜式电磁感应发生装置的电子白板， 它包括表面为书 写层， 底层为底部支撑托层， 两层之间内部设有输入感应区、 识别控制电路、 信号输出装置， 周边设有框架的电子白板本体， 还有书写输入笔， 其特征在于： 所述的感应区由覆盖层以及电磁感应发生层和底部支撑托层构成， 其中电磁感 应发生层的基层为绝缘柔性隔膜， 隔膜表面印制有电磁感应接收天线阵列， 构 成柔性隔膜式电磁感应发生层， 该层的输出接控制识别电路， 书写输入笔带有 无线电信号发生装置。 ':·. '
2、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的控制识别电路设置在印刷线路板 PCB上。
3、 根据权利要求 1或 2或所述的具有柔性隔膜式电磁感应发生装置的电 子白板， 其特征在于： 所述的柔性隔膜式电 感应发生层的天线输出端压接、 插接或焊接在印刷线路板 PCB对应的输入引脚上。
4、 根据权利要求 1或 2所述的具有柔性隔膜式电磁感应发生装置的电子 白板， 其特征在于： 所述的电磁感应接收天线阵列为沿 X轴、 Y轴方向分布的 感应天线单元。
5、 根据权利要求 4 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的感应天线单元分别印制在隔膜表 ¾的两面上。
6、 根据权利要求 5 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的隔膜表面的两面分别印制有一层以上并且每层之间相 互绝缘的 X轴、 Y轴的感应天线单元。
7、 根据权利要求 6 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的一层以上所印制感应天线单元， 每层感应天线单元的 间隔大小可以相同或不同。
8、 根据权利要求 1、 5、 6、 7所述的具有柔性隔膜式电磁感应发生装置的 电子白板， 其特征在于： 所述的感应天线单元为银浆或银浆碳浆混合材质。
9、 根据权利要求 4 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的感应天线单元为环形或直线形。
10、 根据权利要求 5、 6、 7所述的具有柔性隔膜式电磁感应发生装置的电 子白板， 其特征在于： 所述的感应天线单元为环形或直线形。
11、 根据权利要求 1或 3所述的具有柔性隔膜式电磁感应发生装置的电子 白板， 其特征在于： 所述的隔膜可为菲林材质。
12、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的电磁感应发生层后可以设有屏蔽层， 用于增强设备的 抗干扰能力。
13、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的输入笔的笔尖后部可以设有 Z轴方向压力传感器， 该 传感器的输出接电磁波发生装置的控制端。
14、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的信号输出装置为有线电缆连接装置或无线数据交换装 置。
15、 根据权利要求 14 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的有线电缆连接装置为具有 USB连接口的电缆。
16、 根据权利要求 14 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的无线数据交换装置为射频发射 /接收器。
17、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的信号输出装置直接接计算机和 /或打印机。
18、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的信号输出装置直接接数据存储设备。
19、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板，其特征在于： 所述的书写输入笔的无线电信号发生装置为电磁波发生装置。
20、 根据权利要求 1 所述的具有柔性隔膜式电磁感应发生装置的电子白 板， 其特征在于： 所述的书写输入笔的无线电信号发生装置带有 RF发生或接 收装置， 对应白板本体上设有 RF接收或发生装置。
PCT/CN2002/000533 2001-12-29 2002-08-02 An electronic whiteboard having flexibility membrane electromagnet induction generating device WO2003056417A1 (en)

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KR1020047010321A KR100655511B1 (ko) 2001-12-29 2002-08-02 유연성 격막식 전자기감응 발생장치를 구비한 전자 화이트보드
EP02754157A EP1471411A4 (en) 2001-12-29 2002-08-02 ELECTRONIC WHITE TABLE WITH FLEXIBILITY MEMBRANE ELECTROMAGNETIC PRODUCTION GENERATION DEVICE
US10/500,479 US7499034B2 (en) 2001-12-29 2002-08-02 Electronic whiteboard having flexibility membrane electromagnet induction generating device
JP2003556874A JP2005513669A (ja) 2001-12-29 2002-08-02 柔軟な隔膜式電磁感応発生装置を有する電子白板
AU2002323822A AU2002323822A1 (en) 2001-12-29 2002-08-02 An electronic whiteboard having flexibility membrane electromagnet induction generating device

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CN01279677.8U CN2512043Y (zh) 2001-12-29 2001-12-29 具有柔性隔膜式电磁感应发生装置的电子白板

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US20050211476A1 (en) 2005-09-29
JP2005513669A (ja) 2005-05-12
KR20040071769A (ko) 2004-08-12
AU2002323822A1 (en) 2003-07-15
KR100655511B1 (ko) 2006-12-08
CN2512043Y (zh) 2002-09-18
EP1471411A1 (en) 2004-10-27
US7499034B2 (en) 2009-03-03

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