US Patent No. 9,278,419

LENS SHAPE MACHINING METHOD AND LENS SHAPE MACHINING DEVICE FOR CARRYING OUT MEASUREMENT ALONG SPIRAL MEASUREMENT PATH


Patent No. 9,278,419
Issue Date March 08, 2016
Title Lens Shape Machining Method And Lens Shape Machining Device For Carrying Out Measurement Along Spiral Measurement Path
Inventorship Yonpyo Hon, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,278,419

1. A lens shape machining method of machining a lens shape by using a lens shape machining device which has an onboard measuring
device, and relatively moving a tool and a machining object along a spiral machining path, the method comprising the steps
of:
machining along the spiral machining path;
acquiring shape measurement data by relatively moving a probe of the onboard measuring device with respect to the machining
object along a spiral measurement path having a radius increasing and decreasing amount which is larger than a radius increasing
and decreasing amount of the spiral machining path, after the machining, and measuring the machining object at a measurement
point on the spiral measurement path by the onboard measuring device;

determining interpolated shape measurement data at an intersecting point of a plurality of radial lines passing through a
center of the lens shape and the spiral measurement path by interpolating the shape measurement data;

determining a shape error amount which is a deviation between the interpolated shape measurement data and reference data,
at the intersecting point of the radial lines and the spiral measurement path;

determining a compensated machining amount for removing the machining error at the machining point which is the intersecting
point of the radial lines and the spiral machining path, on the basis of the determined shape error amount;

determining a machining point compensated machining amount at each of the machining points on the spiral machining path, on
the basis of the determined compensated machining amount;

creating a compensated machining path on the basis of the determined machining point compensated machining amount; and
executing the machining of the machining object by relatively moving the tool of the lens shape machining device and the machining
object along the created compensated machining path.