Electromagnetic induction, infrared, resistance pressure, ultrasonic, CCD, optical information processing technology, etc. Each technology has different characteristics and advantages, and has a certain share in the market. The analysis report of the international authoritative market research organization shows that in recent years, the electronic whiteboard with pressure sensing technology has dominated the market, occupying about 2/3 of the market share, followed by ultrasound and infrared technology, accounting for about 1/6 Market share.
(1) Pressure sensing technology
The electronic whiteboard using pressure-sensitive input is equivalent to a touch screen of the computer. When the teacher touches the options displayed on the screen with a finger or a pen, the computer will automatically handle the corresponding operation. In fact, there are two laminated sensing films inside this electronic whiteboard. When a certain point on the surface of the whiteboard is stressed, the two films form a short circuit at this point. The controller of the electronic whiteboard detects the coordinate value of the pressure point and transmits it to the interface to computer. The main manufacturers are Smart, Magic Technology, and Tianshibo.
(2) Laser technology
The electronic whiteboard using the laser tracking principle has a laser emitter on each side. After the electronic whiteboard starts, the laser transmitter emits laser light to scan the surface of the electronic whiteboard, and the special pen has the function of sensing the laser, so that when the teacher uses the photosensitive pen to operate on the electronic whiteboard, the laser emitter will scan to the position of the photosensitive pen.
(3) Electromagnetic wave technology
The electromagnetic induction whiteboard uses a pen that can emit electromagnetic waves, and the receiving coil film is arranged in the horizontal and vertical directions of the whiteboard. When the pen is close to the receiving coil membrane, electromagnetic waves emitted by the pen will be induced on the coil. The closer to the pen, the higher the electromotive force induced by the coil membrane. The main manufacturers are Pumi, IQ and Spied.
(4) Infrared technology
The infrared and receiving tubes scattered around the display area form a horizontal and vertical scanning grid to form a scanning plane network. When an object blocks a pair of horizontal and vertical scanning lines in the grid, it can pass through The horizontal and vertical infrared positions of the block determine the X and Y coordinates. The main manufacturers are Honghe and Zhibode.
(5) Ultrasonic technology
Place two ultrasonic receiving devices distributed at a fixed distance on both sides of the screen. The pen used for positioning is an ultrasonic transmitter. When the pen moves on the surface of the screen, the transmitted ultrasonic waves are detected by the receiver along the surface of the screen. The time of receiving the ultrasonic wave can be converted to the distance between the pen and the two receivers.
(6) Optical information processing technology (photon whiteboard)
The principle of the photon whiteboard is optical information processing technology. Its essence is to turn the projected area into a high-precision optical "touch screen", which can be remotely "clicked and touched" using a light spot. Specifically, the current "touch screen" is touched by hand or pen, such as the touch screen of an electronic whiteboard, the touch screen of a mobile phone, the touch screen of a bank number machine, the touch screen of an automatic teller machine, and so on. Photon whiteboard is equivalent to changing the screen touched by hand or pen into a screen touched by "light spot". (Organized by China Educational Equipment Purchasing Network)
Fundation Brush,Face Makeup Brushes,Essential Makeup Brushes,9Pcs Brush Set
DONGGUAN YACAI COSMETICS CO.,LTD. , https://www.yacaicosmetic.com