| 摘要 |
PURPOSE:To enable a workpiece, having a radius of curvature in various kinds, to be stably polished by placing a rotary axis of the workpiece crossing the turning axial line of a swivel arm in one point and setting this imaginary crossing point to be positioned in the bottom of the workpiece. CONSTITUTION:A supporting device supports a swivel arm 4 turnably through the first supporting axial part 3 to the bottom end part of a stay 2 and a workpiece supporting shaft 6 rotatably through the second supporting axial part 5 to this arm 4. The axial line of this workpiece supporting shaft 6 is set so as to pass through the center of curvature (spherical center) 0 of a workpiece (lens) 7 supported to this shaft 6. A rotary axial line Z of the workpiece 7, passing through this center of curvature 0 of the workpiece 7, crosses the axial line of the first rotary axial part 3, that is, the turning axial line X of the swivel arm 4 in one point S. The supporting device, positioning this point S in the bottom of the workpiece 7 and generating a polishing angle sufficiently small within 30 deg., polishes the workpiece 7 stably from its bottom side by a polishing plate. |
