| 摘要 |
<p>PROBLEM TO BE SOLVED: To comply with the shape and structure of a display even when the device is arranged in front of a display panel, to eliminate functional restrictions, and to simplify the structure by detecting the X and Y coordinates of an input pen on the basis of a scanning angle for calculating the pen position when a photodetected input value reaches a certain level by a rotational angle detection part, etc., of a rotating mechanism. SOLUTION: The light from the light source 1b of a semiconductor laser is converged by a collimator lens provided in the front into a parallel light beam, which is made to irradiate the surface of a rotary mirror 1a fixed at a predetermined position, thereby making a rotary scan in parallel to an input surface 4. At this time, the parallel light beam is inputted in parallel to a photodetecting element 1c for reference position setting and converted into an electric signal. Then a CPU 11 calculates the X and Y coordinates of the input pen on the basis of the scanning angle for calculating the position of the pen 3 when the light is photodetected and its input value reaches the certain level from the elapsed time from a rotation detection part built in a motor or a reference position.</p> |
