| 摘要 |
A light guiding apparatus for optical pen comprising a light source, an optical sensor and a light guide is disclosed. The light source emits light towards an outlying surface where the optical sensor captures a reflected imaging light that travels in a direction defined with a captured light. The light guide is made of light conducting material and consists of a light-inlet, an extension member, and a light-outlet. The light-inlet is disposed near the light source. The extension member extends a predetermined distance from the light-inlet essentially along a direction parallel and opposite to the captured light. The light-outlet is situated at an end of extension member farther away from the light-inlet. The light emitted by the light source is first guided by the light guide and then illuminates on the outlying surface at an inclined angle ranged between 21~50 degrees to enhance the contrast and recognizability of reflected imaging light.
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