Polishing method for optical elements

A line-contacted polishing method for spherical or planar optical elements, comprising steps of:

• 1) forming a polishing device (100) by pressing a polishing disc connecting rod (11) into a polishing disc fixing port (21) hollowed at a top of a profiling polishing disc base (7), and fixing with screws (4), in such a manner that no interval exists therebetween;
• 2) sticking a polishing film (3) on a bottom of the profiling polishing disc base (7) with a binding agent, and trimming a curvature radius of the polishing film (3) after the binding agent is solidified;
• wherein the polishing film (3) is stuck on a revolution surface of the profiling polishing disc base (7), and a sticking height ensures that the polishing film (3) is fixedly stuck and covers the whole revolution surface;
• 3) during trimming, installing the polishing device (100) on a work piece shaft of a numerical-controlled device, and installing a trimming grinding wheel (5) on a tool shaft of the numerical-controlled device;
• trimming the polishing film (3) by point-contacting between the trimming grinding wheel (5) and the polishing film (3);
• and
• 4) installing the polishing device (100) on the tool shaft of the numerical-controlled device, and installing an unprocessed optical element (6) on the work piece shaft of the numerical-controlled device;
• during polishing, firstly inputting surface forming parameters of an aspheric surface of the unprocessed optical element (6) and size parameters of the polishing device (100) into a processing software, and generating a numerical-controlling file, so as to control the polishing device (100) and the unprocessed optical element (6) by the numerical-controlled device, in such a manner that the polishing device (100) line-contacts with the unprocessed optical element (6) at any processing position.

A point-contacted polishing method for aspheric optical elements, comprising steps of:

• 1) forming a polishing device (100) by pressing a polishing disc connecting rod (11) into a polishing disc fixing port (21) hollowed at a top of a spherical polishing disc base (8), and fixing with screws (4), in such a manner that no interval exists;
• 2) sticking a polishing film (3) on an arc-portion at a bottom of the spherical polishing disc base (8) with binding agent, and trimming a curvature radius of the polishing film (3) after the binding agent is solidified;
• 3) during trimming, installing the polishing device (100) on a work piece shaft of a numerical-controlled device, and installing a trimming grinding wheel (5) on a tool shaft of the numerical-controlled device;
• trimming the polishing film (3) by point-contacting between the trimming grinding wheel (5) and the polishing film (3);
• and
• 4) during utilization, installing the polishing device (100) on the tool shaft of the numerical-controlled device, and installing an unprocessed optical element (6) on the work piece shaft of the numerical-controlled device;
• during polishing, firstly inputting surface forming parameters of an aspheric surface of the unprocessed optical element (6) and size parameters of the polishing device (100) into a processing software, and generating a numerical-controlling file, so as to control the polishing device (100) and the unprocessed optical element (6) by the numerical-controlled device, in such a manner that the polishing device (100) contacts with the unprocessed optical element (6) at a P point of any processing position;
• wherein the P point coincides with an aspheric meridian section curve relative to a moving trace of the unprocessed optical element (6).