| 摘要 |
The present invention is a form of a digitizer and absolute position determination device for indicating the instantaneous position and movement of a stylus on a surface. It proposes the use of at least three points of position-related information for indicating X-Y coordinates and a surface such as paper comprising two points of the three points of position-related information. The stylus or pen 2 in FIG. 1 comprising a writing element 6 and one of the three points of position-related information has a light source 16 illuminating the surface. A detector 3 comprising a charge-coupled device (CCD) located on the stylus detects the position-related information. The position-related information from the CCD is sent to a computer for processing and finally the desired information output to the user. Different frequency(s) of light can be used depending on the application. During the process of writing, position-related information is detected and sent to the computer for analysis, and finally output to the user. The position of the writing element is determined using the principals of triangulation. Through the use of handwriting recognition software, the output can be converted to a "keyboard-typed" representation of the handwritten text.
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