| 摘要 |
PROBLEM TO BE SOLVED: To provide a position-detecting method and a position-detecting mechanism for detecting position on a spherical surface without causing increase in the size of a device or increase in complexity. SOLUTION: A position-detecting mechanism 1 comprises a sphere 2 comprising a spherical surface 21 on which a diffraction lattice is formed, a laser beam projecting means 3 for irradiating a laser beam 5 to the spherical surface 21, and a read means 4, which receives diffraction light 6 of the laser beam 5 which is diffracted with the diffraction lattice for reading its diffraction pattern. Based on the diffraction pattern, an irradiation point 24 of the laser beam 5 on the spherical surface 21 is detected.
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