Method and apparatus for grinding the rim of a lens

Details Method and apparatus for grinding the rim of a lens Method and apparatus for grinding the rim of a lens

1997-04-16

1998-07-07

Morgan, Eileen P.

Abrading

Precision device or process - or with condition responsive...

Computer controlled

451 10, 451 11, 451 43, 451237, 451240, 451256, B24B 4900

Patent

active

057759731

ABSTRACT:
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 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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patent: 5630746 (1997-05-01), Gottschald et al.
patent: 5716256 (1998-02-01), Mizuno et al.

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