Lens processing device, lens processing method, and lens measuring method

A spectacle lens machining method of subjecting a spectacle lens being machined rough machining and finishing beveling based on pre-obtained data on a spectacle frame shape which is an object of machining, thereby machining said spectacle lens being machined to a predetermined spectacle frame shape, using a spectacle lens machining apparatus which includes:

• a lens holding unit provided with a lens holding shaft which is a turnable shaft and which has a mechanism of holding the spectacle lens being machined at a center of the lens in such a manner that a direction of said shaft intersects a lens optical surface, and also provided with a turn driving mechanism which drives said lens holding shaft so as to turn according to a predetermined machining command information, thereby rotating said lens about the center of the spectacle lens to move a machined position of a circumferential edge of the spectacle lens;
• a lens machining mechanism provided with a revolving machining tool which edges the circumferential edge of said spectacle lens being machined that is held by said lens holding unit according to the predetermined machining command information, to machine the spectacle lens to the predetermined spectacle frame shape;
• and
• a control information processing apparatus which has a function of sending necessary information including the predetermined machining command information to said lens holding unit and said lens machining mechanism to control their operations,
• wherein a same beveling tool is used for a series of cutting machining from said rough machining to said finishing beveling;
• said rough machining process is performed being divided into a primary rough machining process and a secondary rough machining process;
• said primary rough machining process is a process of cutting in a spiral locus relative to the end surface of the circumferential edge of said spectacle lens being machined, thereby machining the spectacle lens being machined to a substantially equal shape to said shape of the machining object;
• said secondary rough machining process is a process of machining the spectacle lens being machined that has been subjected to said primary rough machining until only a portion to be cut away by the subsequent process of the finishing beveling is left equally along an entire lens periphery at the end surface of the circumferential edge of the spectacle lens being machined;
• and
• said finishing beveling process is a process of forming a final beveling surface on the end surface of the circumferential edge of said spectacle lens being machined.

A spectacle lens machining method of subjecting a spectacle lens being machined to rough machining and finishing beveling based on pre-obtained data on a spectacle frame shape which is an object of machining, thereby machining said spectacle lens being machined to a predetermined spectacle frame shape, using a spectacle lens machining apparatus which includes:

• a lens holding unit provided with a lens holding shaft which is a turnable shaft and which has a mechanism of holding the spectacle lens being machined at a center of the lens in such a manner that a direction of said shaft intersects a lens optical surface, and also provided with a turn driving mechanism which drives said lens holding shaft so as to turn according to a predetermined machining command information, thereby rotating said lens about the center of the spectacle lens to move a machined position of a circumferential edge of the spectacle lens;
• a lens machining mechanism provided with a revolving machining tool which edges the circumferential edge of said spectacle lens being machined that is held by said lens holding unit according to predetermined machining command information, to machine the spectacle lens to a predetermined spectacle frame shape;
• a control information processing apparatus which has a function of sending necessary information including the predetermined machining command information to said lens holding unit and said lens machining mechanism to control their operations;
• and
• a lens shape measurement apparatus including:
• a position measurement apparatus which measures coordinates of a predetermined position of the optical surface of said spectacle lens being machined that is held by said lens holding unit;
• and a measurement information processing apparatus which sends control command information to said lens holding unit, controls a position of said spectacle lens being machined relative to said position measurement apparatus to measure coordinates of each position of the optical surface of said spectacle lens being machined, and finds shape information necessary for machining said spectacle lens being machined based on information on this measurement,
• wherein at a middle stage of said rough machining, said lens shape measurement apparatus measures shape at each position along a locus of a designed machined shape of the spectacle lens being machined that has been subjected to the rough machining, information on lens shape including an edge thickness at each position along the locus of said designed machined shape is tentatively obtained, and the bevel finishing using this shape information is performed.