Abstract:
PROBLEM TO BE SOLVED: To provide an optical lens polishing method capable of excellently polishing the entire face to be polished of non-rotational symmetry. SOLUTION: The optical lens polishing method comprises a step S1 of calculating and identifying the axial direction in which the mean curvature of a face to be polished of a lens is minimum, a step S2 of mounting the lens on a polishing device so that the axial direction in which the mean curvature of the face to be polished of the lens is minimum is matched with the major axial direction of a polishing tool, and a step S3 of polishing the face to be polished with the track-less polishing locus with the polishing locus being slightly deviated for each turn by performing the oscillating and turning motion of the polishing tool and a polishing pad while the face to be polished of the lens is brought into contact with a polishing pad, reciprocating the lens in the axial direction in which the mean curvature of the face to be polished is minimum, and in the direction orthogonal to the axial direction. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a die for a mold or the like which retains fundamental design data, and is suitable for preventing the deterioration of an optical property as an eyeglass lens.SOLUTION: In a method of manufacturing a die for a mold, design data of a formed surface are created based on predetermined prescribed information, the formed surface is generated in accordance with the design data. Error amounts to a design value by the design data are specified on respective first and second corresponding points corresponding to respective first and second reference points defined on the generated formed surface. A first corrected surface is defined based on the error amount on the first corresponding point. A second corrected surface which does not have refractive power at the first corresponding point is defined based on the first corrected surface and the error amount on the second corresponding point. The design surface by the design data, the first corrected surface and the second corrected surface are synthesized, the design data are corrected based on the synthesized data after the synthesis, and the formed surface is generated in accordance with the corrected design data.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for determining whether machining of a lens shape can be performed in accordance with given data of a lens peripheral edge shape. SOLUTION: In the method for determining lens shape machining propriety of eyeglass lens, whether machining of the lens shape can be performed in accordance with the lens peripheral edge shape is determined based on the peripheral edge shape data of the lens showing the peripheral edge shape of the lens by a coordinate point group in a two-dimensional coordinate system. The method for determining the lens shape machining propriety includes an external contact point specifying step and a machining propriety determination step. In the external contact point specifying step, two coordinate contact points contacting an external contact point specifying line are specified as external contact points P1 and P2. In the machining propriety determination step, when there is at least one coordinate point Qn between the two external contact points P1 and P2 specified by the external contact point specifying step, the determination is made on whether the lens shape machining between the two external contact points P1 and P2 can be performed by using a machining tool having a predetermined tool radius R. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical lens, a design method of the chamfering surface of an optical lens and a chamfering method of the optical lens, which method is capable of definitely preventing the losses of edge sections of the lens, a personal injury or the like by performing chamfering work so as not to create any corners. SOLUTION: Chamfering work is performed on the bonded section of a concave side optical plane 2b and a cut plane 2c of the lens 1 to form a chamfered plane 3. The chamfered surface 3 is formed on an arc plane of radius R smoothly continuing on the optical plane 2b. In addition, a primary differential coefficient (slant α of tangent M1) at the bonded section (point P) on the chamfered plane side in the optical plane 2b and a primary differential coefficient (slant α of tangent M2) at the bonded section (point P) on the optical plane side in the chamfered plane 3 are matched. COPYRIGHT: (C)2006,JPO&NCIPI