SPECTACLE LENS AND ITS MACHINING METHOD AND MACHINING DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a spectacle lens which is smoothly fittable even into a spectacle lens frame having a large curvature. SOLUTION: The peripheral edges of the raw lens Re in a roughly machined state clamped by lens revolving shafts 8a and 8b are ground by a grinding wheel 40 supported by a grinding wheel revolving shaft 41 while the relative attitude of the grinding wheel 40 and the raw lens Re is changed, by which a groove is formed. At this time, the tilt direction with respect to the direction orthogonal to the lens optical central line of the groove at an arbitrary position in the circumferential direction of the spectacle lens is matched or approximated to the depth direction of the groove in the lens frame to which the lens is fitted.