| 摘要 |
<p>A track ball device includes a ball, a roller rotating according to rotation of the ball, a detector for detecting rotation of the roller, and a switch being activated when being depressed with the ball. The ball is made of polyether urethane resin material having a hardness ranging from JIS K7311 JISA80 to JISA99. The roller is spaced from the ball when the ball is not activated. The switch is activated and generating a click feel when being depressed with the ball. The track ball device provides a clear click feel through the ball from the push switch.</p> |
