Method for estimating the angular offset, method for calibrating a grinding machine for opthalmic glasses and device for carrying out said calibrating method
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United States of America Patent
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Mar 13, 2007
Grant Date -
Sep 28, 2006
app pub date -
Dec 30, 2003
filing date -
Mar 14, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method for estimating the angular offset between a rotating radial axis linked to a glass which is to be ground and a reference rotating radial axis which can be applied to a grinding machine for ophthalmic glasses. Said method comprises the following steps: a glass-calibrator is ground, whereby a radial axis linked to the glass is previously made by tracing according to a control rule corresponding to the form of the theoretical finished glass-calibrator whereby the theoretical inclination thereof is known for a reference part of the contour thereof in relation to said radial reference axis; said image (31AI, YI) is analyzed in order to measure the real inclination (I) of the image (33AI) of the reference part (33A) in relation to the image (YI) of the pattern; the angular offset is calculated. The invention also relates to the use of said estimation method in order to calibrate the grinder. and to a device for carrying out said calibration method.
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