KR910018131A - Lens polishing method and apparatus - Google Patents

Abstract

The invention provides a method of generating a lens having desired base and cross curvatures by means of a circular cup shaped diamond tool (42), which is rotated about an axis and is swept repeatedly over a lens blank (68) to remove material so as to generate the required surface, the tool being positioned so as to produce the desired combination of base and cross curvatures on the blank, the method comprising positioning the diamond tool by means of a cross slide (24) and a base slide (22), both of which slides are free to move during the generation of the surface; sweeping the rotating tool over the lens blank and adjusting the cross slide and/or the base slide during the sweep thereby to vary the head angle of the tool during the sweep such that at any position in the sweep the instantaneous head angle is at a value whereby the desired cross curvature produced is constant over the sweep. The invention also relates to a lens generating machine. <IMAGE>

Description

Lens polishing method and apparatus

Since this is an open matter, no full text was included.

1 is a plan view of a lens manufacturing machine of known type, FIG. 2a is a schematic plan view of a lens manufacturing machine according to the present invention, FIG. 2b is a front view of a manufacturing machine according to the present invention, and FIG. 3a is a diamond tool of the machine of FIG. Fig. 3b is a schematic diagram showing a path along which a diamond tool of a machine follows to produce a predetermined basic curve.

Claims (10)

Rotated about an axis and repeatedly moved over the lens blank to remove material to form a predetermined surface, and arranged to obtain a desired combination of the base and the intersecting surface of the rank, and by the circular cup-shaped diamond tool And a method of manufacturing a lens having an intersecting curved surface, both of which position the diamond tool by a cross slide and a slide freely moving during surface fabrication, cutting and rotating the rotary tool over the lens blank and cross slide during the raise movement. And / or by adjusting the basic slice so as to convert the head angle of the tool in motion so that the instantaneous head angle at all cutting movement points is a value that makes the predetermined cross-curved surface constant over all cutting movement points. How to make a lens. The lens manufacturing method according to claim 1, wherein the value of the instantaneous head angle indicates an effective head angle that is cut and calculated at a prescribed cutting movement radius and a cutting movement angle of 0 degrees. The second method of claim 1, wherein the signal from the detector in which the cutting travel angle is sensed by the detector and which represents the instant cutting travel angle is related to all the required torques for the head angle and is adapted to adjust the cross slide and / or the basic slide. A lens manufacturing method, characterized in that it is processed to provide a signal. 4. A method according to claim 3, wherein the second signal is adapted to first adjust the intersecting slide to a predetermined head angle and then to adjust the base slide at a predetermined counterattack. 5. Method according to any one of the preceding claims, characterized in that the required surface is against a frequency of 1 to 20 diopters. The method of claim 5, wherein the tool surface corresponds to a frequency of 0 to 3 diopters. In a lens manufacturing machine, an air support device and a lens support device on a base and a cross slide and a basic slide during cutting movement are converted to convert the head angles of the tool during cutting movement so that the instantaneous head angles at all cutting movement points are produced. The tool support device and the lens support device are both mounted on a base, the means including the means for bringing the surface of the tool to be constant over all cutting movement points, the tool support device being a diamond tool and means for rotating the tool. And a tool which is used to cut and move a tool over a lens blank to produce a lens having a predetermined basic and intersecting curved surface. 8. A method according to claim 7, further comprising means for sensing the instantaneous cutting movement angle during the cutting movement and for processing a signal from the sensing means indicative of the instantaneous cutting movement angle to provide a second signal relating to all adjustment values required for the head angle. Means and an adjustment means operable in response to the second signal. 9. The first and second adjusting means of claim 8, wherein the adjusting means comprises first adjusting means for adjusting the cross slide to a predetermined head angle, and second adjusting means for adjusting the basic slide to a predetermined radius. The lens manufacturing machine, characterized in that the operation in response to the second signal. 10. The lens manufacturing machine according to any of claims 4 to 9, which is adapted to fabricate a lens having a frequency in the range of 0 to 20 diopters. ※ Note: The disclosure is based on the initial application.