| 摘要 |
A method of processing the rim of a lens is provided which includes the step of grinding the rim of a lens (LE) with a grindstone (6) so as to fit the configuration of an eyeglass frame while rotating and moving the lens (LE) toward and away from the grindstone (6) at intervals of a rotational angle (n DELTA theta ) in accordance with lens processing data ( rho n, n DELTA theta ) which have been measured by a configuration measuring portion (46). The method further includes the steps of, in accordance with the data ( rho n, n DELTA theta ) and the radius of curvature of the grindstone (6), obtaining a displacement angle (d theta n) between an assumed processing point at a radius vector ( rho n) of the rotational angle (n DELTA theta )[n=0, 1, 2, 3, . . . i] and a true processing point where the lens (LE) comes into contact with the grindstone (6) at the rotational angle (n DELTA theta ), and lowering a rotational angular speed of the lens (LE) at an angular interval (n) between (n-1 DELTA theta ) and (n DELTA theta ) as the displacement angle (d theta n) at the rotational angle (n DELTA theta ) becomes larger so that the ground quantity of the rim of the lens (LE) becomes substantially constant.
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