| 摘要 |
A photosensing device for sensing an image of a working plane is provided. The photosensing device includes a light source, an image sensor, a lens and a spectroscope. The light source emits light to be projected onto the working plane. The image sensor is used for generating an electronic signal of an image of the working plane. The lens is used for focusing the light reflected from the working plane, and the lens and the image sensor have a common central axis. The spectroscope deflects at least a portion of the light emitted from the light source toward the working plane and allows the deflected light to be reflected toward the direction of the central axis so as to be received by the lens.
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