Light Pen

Light pen such as pen, used to show on the screen or a special board.  Every touch of the pen on the area concerned, will lead to throbbing electronic pulse. Light pen has a sensor that can transmit light signals to a computer, and then recorded.

How to use light pen

The use of light pen is sometimes equipped with a drawing board, where the board's surface is divided into hundreds of small area, and the area is then connected to a computer. Put light pen to the drawing board, and then draw something use that light pen.
Another way to draw with light pen, you can put the paper containing picture at the above drawing board, and then with a light pen that is specified regions scratches path. Finally, the scheme also appears on the monitor image.