Patent ID: 8038507

Claim:
An eyeglass lens processing apparatus for beveling a peripheral edge of an eyeglass lens by a beveling tool, the eyeglass lens processing apparatus comprising: an edge position detector which detects a front edge position and a rear edge position of the lens on the basis of a target lens shape; a mode selector which shifts a processing mode to a high curve processing mode for a high curve frame; a bevel locus setting unit which includes: a) a provisional bevel locus calculator which obtains a provisional bevel locus by obtaining a bevel curve substantially equal to a curve along the frame or a curve along a front surface of the lens when the high curve processing mode is selected; b) a nose-side bevel position determining unit which determines a corrected bevel apex position at a nose-side edge position of the lens by setting a width of a front bevel slope, ox obtaining a nose-side bevel apex position in which the width of the front bevel slope is substantially equal to or smaller than a width of a rear bevel slope; c) an ear-side bevel position determining unit which determines a corrected bevel apex position at an ear-side edge position of the lens by setting a position in which an ear-side bevel apex position on the provisional bevel locus is shifted to a rear surface of the lens, or obtaining a position in which a predetermined positional relationship between the ear-side bevel apex position and the nose-side corrected bevel apex position is satisfied; and d) a corrected bevel locus calculator which obtains a corrected bevel locus which has a curve value equal to a value of the bevel curve and passes through the nose-side corrected bevel apex position and the ear-side corrected bevel apex position; and a controller which obtains beveling data based on the corrected bevel locus and controls an operation of the apparatus according to the beveling data.