| 摘要 |
An optical trace detecting module includes a light-pervious plate, a circuit board, and a light guiding element. The light-pervious plate contacts an object and allows the object to move on a surface thereof. The circuit board is electrically disposed with an optical sensor and a light source. The light guiding element is disposed between the light source and the light-pervious plate. A sensing light projected from the light source is converged and guided by the light guiding element so as to be projected onto a contact region of the light-pervious plate.
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