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1、电子白板分类一、按工作原理不同分类交互式电子白板通过不同的技术实现，其原理也有较大的区别，按照工作原理来 分可归纳为六类：电磁、红外、压感（电阻）、CCD （光学影像）、超声波、电容技术。1. 电磁技术工作原理：电子白板体内置电磁波接收线圈，电子白板专用的电磁笔点击板面时发 射电磁波，依据接收电磁波的频率、强度计算电磁笔的坐标位置。2. 红外技术工作原理：电子白板边框设置红外线发射、接收对管，通过红外线在白板表面形成 红外线网络矩阵。当不透明物体接触板面时，红外线被遮挡，由此判断书写的坐标 位置。3. 压感（电阻）技术工作原理：电子白板表面有两层加电压且绷紧的导电膜，平时并不导通。当按压时，
2、两层导电膜接触，产生电流，根据电流的强度弱小可以判定接触点的坐标，实现定 位。4. CCD （光学影像）技术工作原理：在电子白板周围设置固定的CCD探测器和红外发射器，当有不透明物 体接触板面时，光线被遮挡，CCD探测器可以检测到对应的暗区，由此计算出坐标 位置，是一种交叉点测试定位方式。5. 超声波技术工作原理：在屏幕一侧放置两个按固定距离分布的超声波接收装置，用于定位的笔 是一个超声波发射器，当笔移动在屏幕的表面时，所发射的超声波沿屏幕表面被接 收器检测到，由收到的超声波时间可以换算出笔与两个接收器的距离，由此计算出 书写笔的坐标。6. 电容技术工作原理：电子白板体内置电容线圈，当物体（如
3、手指）接触板面时，改变接触点 的电容，引起对应线圈的电势变化。通过检测电势变化，计算出接触点的坐标值。二、按安装方式分类交互式电子白板从安装方式来分，可以归为四类：壁挂式、滑道式、移动式、壁 橱式。Classification of Interactive Whiteboard (IWB).I. According to its different working principlesInteractive whiteboard works through different technologies. There are big differences even among its prin
4、ciples. According to its working principles, we can classify the IWB to six types, namely Electromagnetic, Infrared, Pressure Sensitivity (Resistive), CCD( Optical Imaging), ultrasonic, and capacitive ones1. Electromagnetic IWBWorking principle: built electromagnetic receiving coils in the IWB. When
5、 use the special e-pen to click the board, there will be electromagnetic wave emitting. It can calculate the e-pens coordinate position according to the frequency and strength of received EM waves2. Infrared IWBWorking principle: built infrared emission and receiving pipe around the IWB frame, the i
6、nfrared rays in the surface of IWB can form network matrix. When opaque objects touch the panel, the rays will be sheltered, hence estimate the coordinate position.3. Pressure Sensitivity( Resistive) IWBWorking principle: there are two layers tight conductive film with voltages in the surface of boa
7、rd, and it is not conductive usually. But when press the board, these two layers contact which can generate electricity. And according to the strength of current, it can determine the coordinates of touch point, thus achieve the purpose of locating.4. CCD Optical Imaging IWBWorking principle: Set fi
8、xed CCD detector and infrared emitter in the surrounding of IWB. When opaque objects touch the board surface, the light will be blocked out, accordingly CCD detector can detect the dark area out, therefore calculate the coordinate position. This kind of locating is mainly through its intersection te
9、sting.5. Ultrasonic IWBWorking principle: install two ultrasonic receiving devices at a set distance in one side of screen, the pen which is used for locating is a emitter, when you move the pen at the surface of screen board, the emitted ultrasonic wave on it will be detected by the receiving devic
10、e. At the same, it can work out the distance between the pen and two receiving devices by the time of receiving ultrasonic waves and hence the coordinate position of writing pen.6. Capacitive IWBWorking principle: built the capacitance coil in the IWB, when objects, such as finger, touch the board,
11、it will change the capacitance of the contact point, thus cause the potential variation of corresponding coils. This kind of way to calculate the coordinate is by its potential variation.II. According to its installation modeAccording to the installation of IWB, it can be classified into 4 categories, namely wall-mounting type, slide type, movable type and wardrobe type.
