| 摘要 |
<p>PURPOSE:To shorten the position detecting time by deciding a scan area near a position indicated by an input pen after detecting the shift speed and the shift direction of the input pen. CONSTITUTION:A coordinate detector consists of a coordinate input board 1, a scan circuit 2, an A/D converter 5 and an arithmetic control part 6. The circuit 2 is driven by a CPU10 of the part 6 for a prescribed scan period via a timer 12, a sampling timer 11, etc. In this case, the starting point is decided for the scan of the board 1 based on the coordinate value indicated by an input pen as well as the shift speed and direction of the pen and by means of registers 16- 20 of the part 6 and fixed value setting devices 21-33 for reference speed. Then the partial areas are scanned for a prescribed number of coordinate lines. Thus a scan area is decided according to the shift speed and direction of the input pen. While the entire area of the board 1 is scanned when the input pen is detached from the board 1. This ensures the detection of coordinates with the satisfactory follow-up performance.</p> |
