Electromagnetic handwriting

Electromagnetic handwriting device is through the wiring device in the bottom of the wiring circuit after power, in a certain space within the scope of the formation of electromagnetic fields, to sense the location of the pen with a pen to work. This technology is currently widely used, mainly by its good performance decisions. Users can use it for smooth writing, feel good, drawing useful. Electromagnetic sensor board also has shortcomings: (1) high voltage requirements, if the use of voltage can not meet the requirements, there will be unstable or can not use the situation. (2) anti-electromagnetic interference is poor, easy to interfere with other electromagnetic equipment. (3) stylus pen tip is the moving parts, short life (usually about a year). (4) must use a stylus to work, can not operate directly with your fingers.