| 摘要 |
An optical pen comprising a shaft, a pen tip, a light source and an optical sensor. The shaft extends a predetermined length along an axial direction. The pen tip is arranged at one end of the shaft and situated in the same axial direction. The light source produces light that illuminates an outlying surface near the pen tip to generate a reflected imaging light traveling along a light path. The light path has at least a portion near the pen tip overlapping with said axial direction. The optical sensor is disposed in the light path to receive the imaging light and convert it into electrical signals. In light that the light path that captures imaging light from the optical pen is coaxial with the pen tip, when the optical pen is used for writing, the traveling speed, direction, and distance of images captured by the optical sensor are identical to those of the pen tip.
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