| 摘要 |
PROBLEM TO BE SOLVED: To provide a pin structure which can realize smooth three-dimensional movement and perform precise spherical surface machining when machining the spherical surface of a lens or the like to be polished with high precision. SOLUTION: This pin structure has a machining surface the shape of which corresponds to that of an object to be polished. In the pin structure holding a plate 1 which performs grinding/polishing machining while oscillating in contact with the object to be polished, the plate 1 and a pin 3 are connected by a universal joint 4 having a rotation freedom degree in the directions of mutually perpendicular three axes.
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