Method of calculating circumference and manufacturing a spectacle lens, circumference calculating device and circumference calculating program for use in producing a spectacle lens
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United States of America Patent
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May 21, 2019
Grant Date -
Oct 3, 2013
app pub date -
Mar 18, 2013
filing date -
Mar 29, 2012
priority date (Note) -
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status (Latency Note)
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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.
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