Graphic tablet
In computer systems, the use of pen-based input devices as an alternative to the mouse and keyboard continues to grow. Graphic tablets are widely used as data input devices. By positioning a pointing means at or near a specific area on the tablet, the user can trigger a given action in a manner which is experienced as being natural. A graphic tablet apparatus allows an operator to input positional coordinates in accordance with a drawing to be digitized on which original data is depicted, i.e., handwritten or printed data on a data sheet. Graphical images can be input into the pen computer systems by merely moving the stylus across the surface of the screen, i.e. making a "stroke" on the screen. During typical operation, the user moves a pen over the opaque tablet input device to cause the corresponding movement of the cursor across the graphics display. Digitizer tablets are generally classified by their detection methods into the resistance detection method, the electrostatic capacity method, and the electromagnetic induction method, etc. The electromagnetic induction system electrically scans many coordinate lines, buried in a matrix form in a digitizer table of a digitizer tablet apparatus, and detects voltages induced on the coordinate lines in responsive to the magnetic flux generated by the exciting coil in the input apparatus that picks up coordinates from a data sheet. Graphic tablets are generally made of a transparent substrate having one or more transparent electrodes. Graphic tablets are used not only as an input device alone but also as a device which can be combined with a CRT or LCD and operate information via a display screen.
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