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US 10,293,451 B2Granted
Method of calculating circumference and manufacturing a spectacle lens, circumference calculating device and circumference calculating program for use in producing a spectacle lens
AssigneeHoya Corporation
InventorYoshihiro Kikuchi
Life of this patent
Estimating the term…
Abstract
There is provided a circumference calculating device including an expected shape specifying part 201b configured to obtain an expected finish shape of a bevel in consideration of an interference amount of a beveling tool when beveling is performed to an uncut spectacle lens; and a theoretical circumference calculating part 201d configured to obtain a bevel circumference of the spectacle lens having the expected finish shape obtained by the expected shape specifying part 201b, as a theoretical circumference of this spectacle lens.
Claims3
A method of manufacturing a spectacle lens, the method comprising:
- determining, by a simulation process, a bevel shape after change of a shape due to interference of a beveling tool for beveling an uncut spectacle lens as an expected finish shape of a bevel, the simulation process using a shape data of the beveling tool and a three-dimensional beveling locus data for beveling the spectacle lens by the beveling tool;
- setting a bevel circumference in a spectacle lens having the expected finish shape as a theoretical circumference of the spectacle lens;
- cutting, by the beveling tool, the spectacle lens to the determined bevel shape based on the three-dimensional beveling locus data;
- determining a measured circumference of the cut spectacle lens by measuring the bevel circumference of the cut spectacle lens via a measuring machine;
- comparing the theoretical circumference and the measured circumference of the cut spectacle lens;
- and
- judging whether a defect or non-defect of the cut spectacle lens is present based on the comparison of the theoretical circumference and the measured circumference of the cut spectacle lens.
4 more elements
Dependencies are inferred from the claim text.