Importance

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Abstract

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.about.50 degrees to enhance the contrast and recognizability of reflected imaging light.

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First Claim