Patent ID: 7740520

Claim:
An apparatus for processing a chamfering of an eyeglass lens, comprising: inputting means configured to input a width of a chamfering and a range of the chamfering from a periphery of a lens shape of the eyeglass lens; processing means configured to process the eyeglass lens to have an anterior refracting surface provided on one side of the eyeglass lens, a posterior refracting surface provided on a second side of the eyeglass lens, a groove provided in an edge surface of the eyeglass lens or a V-shaped portion provided on the edge surface, a front edge portion provided on the edge surface disposed adjacent to the anterior refracting surface at one side of the groove or V-shaped portion, and a back edge portion provided on the edge surface disposed adjacent to the posterior refracting surface at a second side of the groove or V-shaped portion; a display configured to display a special chamfering positional mark showing a position of the lens shape, a chamfering positional mark showing a most thinning position of an edge thickness and a chamfering width, a sectional shape at the chamfering positional mark of the lens shape, an edge sectional shape at the special chamfering positional mark of the lens shape to carry out a simulation processing of the eyeglass lens, and a state of a chamfering portion and a change in the state of the chamfering portion when the special chamfering positional mark is moved toward the chamfering positional mark in the simulation; and a control circuit configured to control the processing means based on information from the inputting means, wherein the control circuit controls the processing means so as to chamfer the posterior refracting surface so that a width of the back edge portion in a thickness direction of the eyeglass lens is larger than a width of the front edge portion.