| 摘要 |
<p>PURPOSE:To draw easily a graphic, and also to display the drawn graphic as a real time with a high accuracy and without being distorted, on the drawn position, by constituting so that the graphic can be drawn on the surface of a graphic input/output board with a stylus. CONSTITUTION:A digital picture data read out of a picture memory basing on a synchronizing signal from a rotary synchronizing signal generator 20 is converted to an analog video signal by a video signal decoder 5, by which an optical beam generator group 6 is controlled, and an optical beam having a necessary optical intensity is generated. This optical beam is made to have a necessary raster accuracy and a beam spot diameter, and thereafter, receives a horizontal deflection by a horizontal scanning rotary polyhedral mirror 12, also receives a vertical deflection by a vertical scanning galvanomirror 13, raster-scans the whole surface of a graphic input/output board 1, and projects and displays a graphic stored in the picture memory onto the rear side of the graphic input/output board 1 consisting of a translucent digitizer. In this way, a locus which has moved a stylus 2 can be analyzed and displayed immediately on the graphic input/output board 1, and accordingly, the displayed graphic is superposed on its locus, confirming the movement of the stylus 2, and can be inputted with a high accuracy.</p> |
