Abrading – Precision device or process - or with condition responsive... – Computer controlled
Patent
1998-02-10
2000-08-08
Eley, Timothy V.
Abrading
Precision device or process - or with condition responsive...
Computer controlled
451 43, 451256, B24B 4900
Patent
active
060993839
ABSTRACT:
A lens grinding apparatus is improved to ensure that the angular edge portions of an eyeglass lens are easily ground to a desired shape. The improved lens grinding apparatus includes an input device for entering data on the processing shape of the lens, a detector for detecting the edge position of the lens on the basis of the entered shape data, a first calculator for determining processing data on the rough and fine processings of the lens on the basis of the detected edge position and the entered shape data, an angular edge portion processor which has a grinding wheel to process the angular edge portions of the finely processed lens and which moves the shaft of said grinding wheel relative to a shaft holding the lens, a second calculator which sets a plurality of zones of the lens and which performs different calculations in different zones such that the amount of processing the angular edge portions is determined in correspondence with the radius vector angle of the lens, and a controller for controlling the processing of the lens on the basis of the results of calculation by said first and second calculators.
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Mizuno Toshiaki
Shibata Ryoji
Eley Timothy V.
Nguyen Dung Van
Nidek Co. Ltd.
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