| 摘要 |
<p>An operation unit for inputting the coordinate positions of a control object moving on a displace surface. The invention solves the problems of the prior art in that the turning angle of a knob is too great to move the control object from end to end of the display surface, and service life of the knob is short due to frequent operation. The invention speeds up the rotation of a main shaft by an over-drive gear and detects either optically or magnetically the rotation of the output shaft of the over-drive gear, so the invention can be used suitably as an operation unit of a video game machine.</p> |
