SPHERICAL SURFACE GRINDING METHOD FOR LENS

PROBLEM TO BE SOLVED: To provide a precision grinding method for grinding a spherical surface of the lens at rough and fine grinding stages, which can perform fine grinding of a lens by using a cup grinding wheel instead of a pellet dish conventionally used. SOLUTION: The rough-grinding completed lens 4 retained at the tip of a work shaft 1 is fine-ground by a rotary grinding wheel 3 mounted on a lower end of a wheel shaft 25 supported on an oscillation stand 23 oscillated around an oscillation center P passing through the axis of the work shaft 1 via a X-moving rest 22 moving in the direction orthogonal to the axis of the wheel shaft 25. The cup grinding wheel 3b with a 1500-2500 mesh which is a grinding wheel brought into circle contact with the surface of the lens to be processed is used as the rotary grinding wheel, a wheel shaft is inclined to an angle corresponding to a curvature of the spherical surface of the lens to be ground, and fine grinding of the rough-grinding completed lens 4 is performed while a position of the X-moving rest 22 is set up at the position where a contact circle between the grinding wheel 3b and the spherical surface of the lens passes through the center of the lens on the basis of combination of the rotation of the work shaft 1 and the rotation of the wheel shaft 25b. COPYRIGHT: (C)2009,JPO&INPIT