| 摘要 |
<p>A control device is provided for controlling a cursor motion of an electronic device. The control device includes a holder, a sleeve, and a detecting module. The holder has a first surface near a force-exerting position of the user, a second surface connected with the first surface, and an accommodation space at least facing the second surface. The holder provides a light transmission means beside the accommodation space. The detecting module is used for detecting at least one of a rotating action and a moving action of the sleeve through the light transmission means. The light transmission means includes a transparent zone, a vacant zone and an open zone or the combination of two or more thereof. The light transmission means is located at a suitable position of the holder. Consequently, the influence of the falling dust on the accuracy and sensitivity of the detecting module will be minimized.</p> |
