| 摘要 |
<p>PURPOSE:To improve the resolution of the title coordinate input device by providing scanning type light transmitting-receiving means on a square coordinate plane and at, at least, two nearly corner sections of the coordinate plane and light regressive reflecting bodies along, at least, two sides of the coordinate plane and detecting a coordinate position on the coordinate plane from the photodetecting output signals of at least two of the light transmitting-receiving means. CONSTITUTION:When the light beam which are emitted from scanning type light transmitting-receiving means 35a and 35b toward a light regressive reflecting body 36 applied or provided on the inside surface a frame body 24 surrounding the four sides of the coordinate plane 37 of a display device 9 and totally reflected by the reflecting bodies 36 in a normal way to the photodetecting element are intercepted by an instruction, when the instruction performs coordinate indication on the coordinate plane. Since the X- and Y-coordinates of the point indicated by the finger are found by detecting the intercepted states of the light beam, only two sets of light emitting and receiving elements can manage necessary light emission and reception and the resolution can be decided by the diameter of the spherical surface of the light regressive reflecting surface. Thus a coordinate input device which is simple in constitution low in cost, but high in resolution is obtained.</p> |
