Patent ID: 7540798

Claim:
An eyeglass lens processing apparatus for processing a periphery of an eyeglass lens, the apparatus comprising: a lens chuck that is configured to hold the lens; an endmill comprising a tip that is configured to bevel the periphery of the lens; wherein the tip of the endmill comprises a first edge portion that constitutes a cylindrical surface edge during high speed rotation of the endmill and a second edge portion that constitutes a conical surface edge during high speed rotation of the endmill; wherein an angle between the cylindrical surface edge and the conical surface edge is an obtuse angle; wherein the cylindrical surface edge and the conical surface edge are configured to bevel the periphery of the lens to simultaneously form a bevel incline and a bevel foot such that the bevel incline and the bevel foot form an angle that coincides with the obtuse angle between the cylindrical surface edge and the conical surface edge; a moving unit comprising an inclining unit that is configured to incline the endmill relative to the lens chuck for changing a positional relationship between the lens chuck and the endmill; an operating portion that is configured to calculate front surface side beveling data including an inclining angle of the endmill for simultaneously forming the bevel incline and the bevel foot on a front surface side of the lens by the endmill, and rear surface side beveling data including an inclining angle of the endmill for simultaneously forming the bevel incline and the bevel foot on a rear surface side of the lens by the endmill; and a control portion that is configured to control the moving unit based on the front surface beveling data to simultaneously form the bevel incline and the bevel foot on the front surface side of the lens by beveling the front surface side of the lens and is configured to control the moving unit based on the rear surface side beveling data to simultaneously form the bevel incline and the bevel foot on the rear surface side of the lens by beveling the rear surface side of the lens.