| 摘要 |
<p>The invention generally relates to a surface sensing device comprising an optical monitoring system for measuring a displacement of the tip a hollow stylus with respect to a stylus carrier. According to the invention, the light emitting means of the optical monitoring system are built in such a way that the beam has at least two distinguishable light characteristics with a given characteristics distribution. The optical monitoring system further comprises an optically encoding component (100) positioned in the stylus carrier in the optical return path and designed to transform the information of an impinging position (50, 50') of the returned beam upon the optical encoding component (100) into a change of the characteristics distribution of the returned beam, and the detector means is sensitive for the at least two distinguishable light characteristics and built for generating the electrical output signal dependent on the changed characteristics distribution of the returned beam.</p> |
