摘要:
A lens grinding method of the present invention includes a first step for finding a lens-edge thickness over the entire circumference of a lens-edge vector radius locus of a lens to be cut , a second step for finding a lens-edge vertex position information for dividing the lens-edge into a desired ratio over the entire circumference thereof, and a third step for V-edge edging the lens-edge based on the V-edge vertex position information. Also, a lens grinding apparatus of the present invention includes measuring means (12) for finding a lens-edge thickness over the entire circumference of a lens-edge vector radius locus of a lens to be cut , input means (16) for inputting a desired ratio, calculating means (15) for finding a positional information of a V-edge vertex for dividing the lens-edge at the input ratio over the entire circumference thereof, and controlling means for V-edge edging the lens-edge based on the V-edge vertex positional information. And according to the lens grinding method and the apparatus for carrying out the method, as the lens-edge thickness is measured over the entire circumference of the lens-edge and the movement of the lens in the Z-axis direction is controlled such that the V-edge is formed at a desired ratio over the entire circumference of the lens-edge, the V-edge can be desirably positioned even if a lens having an aspherical refracting surface like a progressive multifocus lens.
摘要:
57 A lens grinding apparatus comprising edge thickness measuring means for, in a photoelectrical and non-contact manner, measuring the edge thickness of the lens to be ground after completion of rough grinding, and a computing means for computing a predetermined position of the lens edge as a distance value from a predetermined movable origin in the direction of the axis of the lens shaft of the carriage on the basis of the data on the edge thickness obtained from the edge thickness measuring means, characterized in that the carriage is arranged to be capable of moving downwardly such that a predetermined position of the line of the edge surface of the lens agrees with the groove bottom of the V-shaped groove when bevel grinding is performed.
摘要:
A device for measuring the profile of a spectacle lens frame comprising a frame holding means (100) for holding the spectacles lens frame (500) or a template (510) formed by profiling machining through profiling said lens frame of said frame, a supporting means (200) for supporting the frame holding means (100) for movement in a predetermined plane, and measuring means (300) including a sensor arm (302) rotatable about a vertical axis which intersects the plane and a sensor means (312) movable on said sensor arm (302) along the axis of the sensor arm (302) whereby the profile of said spectacle lens frame or the template is measured in terms of radius information (pn, 8n) (n = 1,2,3...N), from the rotation angle of the sensor arm (302) and the displacement of the sensor means.