| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a position detection apparatus of a digitizer capable of preventing detection of a virtual image by an image sensor by preventing reflection of an input screen being a display screen. <P>SOLUTION: The position detection apparatus is composed by having a plurality of image sensors 102, 103 equipped in a side and a top part of the input screen of the digitizer, light sources arranged in neighborhoods of the image sensors and irradiating light along the input screen of the digitizer so as to cover a whole face of the input screen, a reflection tape having retroreflectivity perpendicularly arranged on the input screen, and a control means 104 for carrying out image processing using image signals imaged by the image sensors as input and calculating coordinates of an indicated position on the input screen indicated by an input means. Antireflection processing is applied on the input screen of the digitizer. A cover 401 is provided so as to cover the image sensors, the light sources, and the control means, and antireflection processing is applied to a rear face of the cover. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
