Method for controlling eyeglass lens processing device using hall sensor

Abstract

A method for controlling an eyeglass lens processing device includes: polishing the lens, and measuring a separation distance between a movable block and a carriage using a Hall sensor detection unit, in an n th rotation direction of what is obtained by equally dividing an angle of 360 degrees covered by one rotation of the lens rotation axis into m (S 100 ); determining whether the separation distance in the n th rotation is less than a predetermined separation distance upper limit (S 200 ); determining whether the separation distance in the n th rotation is greater than or equal to a predetermined separation distance lower limit (S 300 ) if the separation distance in the n th rotation is less than the predetermined separation distance upper limit in S 200 ; and rotating the lens to an n+1 th rotation position (S 400 ) if the separation distance in the n th rotation is greater than or equal to the predetermined separation distance lower limit in S 300.

1 . A method for controlling an eyeglass lens processing device for processing a lens while controlling a rotational speed of a lens rotation axis, the method for controlling an eyeglass lens processing device using a Hall sensor, comprising:
 (a) polishing the lens, and measuring a separation distance (dn) between a movable block ( 22 ) and a carriage ( 12 ) using a Hall sensor detection unit ( 30 ), in an n th  rotation direction of what is obtained by equally dividing an angle of 360 degrees covered by one rotation of the lens rotation axis into m, wherein a position of the movable block ( 22 ) represents a target polishing position of the lens in the n th  rotation direction, a position of the carriage ( 12 ) represents a polishing position of the lens in the n th  rotation direction, and the separation distance (dn) between the movable block ( 22 ) and the carriage ( 12 ) represents a difference between the target polishing position of the lens and the polishing position of the lens (S 100 );   (b) determining whether the separation distance (dn) in the n th  rotation is less than a predetermined separation distance upper limit (dx_high) (S 200 );   (c) determining whether the separation distance (dn) in the n th  rotation is greater than or equal to a predetermined separation distance lower limit (dx_low) (S 300 ) if the separation distance (dn) in the n th  rotation is less than the predetermined separation distance upper limit (dx_high) in said step S 200 ; and   (d) rotating the lens to an n+1 th  rotation position (S 400 ) if the separation distance (dn) in the n th  rotation is greater than or equal to the predetermined separation distance lower limit (dx_low) in said step S 300 .   
     
     
         2 . The method for controlling an eyeglass lens processing device using a Hall sensor of  claim 1 , further comprising:
 determining whether (a separation distance (dn−1) in an n−1 th  rotation)/(a separation distance (dn−2) in an n−2 th  rotation) is greater than or equal to (the separation distance (dn) in the n th  rotation)/(the separation distance (dn−1) in the n−1 th  rotation) (S 210 ) if the separation distance (dn) in the n th  rotation is greater than or equal to the predetermined separation distance upper limit (dx_high) in said step S 200 ;   rapidly increasing the rotational speed of the lens rotation axis (S 220 ) if (the separation distance (dn−1) in the n−1 th  rotation)/(the separation distance (dn−2) in the n−2 th  rotation) is greater than or equal to (the separation distance (dn) in the n th  rotation)/(the separation distance (dn−1) in the n−1 th  rotation) in said step S 210 , and slowly increasing the rotational speed of the lens rotation axis (S 225 ) if (the separation distance (dn−1) in the n−1 th  rotation)/(the separation distance (dn−2) in the n−2 th  rotation) is less than (the separation distance (dn) in the n th  rotation)/(the separation distance (dn−1) in the n−1 th  rotation) in said step S 210 ; and   rotating the lens to the n+1 th  rotation position (S 400 ).   
     
     
         3 . The method for controlling an eyeglass lens processing device using a Hall sensor of  claim 1 , further comprising:
 determining whether (a separation distance (dn−1) in an n−1 th  rotation)/(a separation distance (dn−2) in an n−2 th  rotation) is less than (the separation distance (dn) in the n th  rotation)/(the separation distance (dn−1) in the n−1 th  rotation) (S 310 ) if the separation distance (dn) in the n th  rotation is less than the predetermined separation distance lower limit (dx_low) in said step S 300 ;   rapidly decreasing the rotational speed of the lens rotation axis (S 320 ) if (the separation distance (dn−1) in the n−1 th  rotation)/(the separation distance (dn−2) in the n−2 th  rotation) is less than (the separation distance (dn) in the n th  rotation)/(the separation distance (dn−1) in the n−1 th  rotation) in said step S 310 , and slowly decreasing the rotational speed of the lens rotation axis (S 325 ) if (the separation distance (dn−1) in the n−1 th  rotation)/(the separation distance (dn−2) in the n−2 th  rotation) is greater than or equal to (the separation distance (dn) in the n th  rotation)/(the separation distance (dn−1) in the n−1 th  rotation) in said step S 310 ; and   rotating the lens to the n+1 th  rotation position (S 400 ).   
     
     
         4 . The method for controlling an eyeglass lens processing device using a Hall sensor of  claim 1 , wherein the eyeglass lens processing device comprises:
 lens-clamping shafts ( 10 ) configured to be rotated by a driving means ( 18 ) and to clamp the lens in a detachable manner, and having centers of their cross-section located on an extension line of the lens rotation axis;   the movable block ( 22 ) in which a polishing wheel ( 20 ) for polishing the lens clamped and rotated by the lens-clamping shafts ( 10 ) is installed on a polishing wheel mount, and whose position changes according to a desired polishing depth of the lens;   the carriage ( 12 ) configured to move the lens clamped and rotated by the lens-clamping shafts ( 10 ) to cause it to be in contact with the polishing wheel ( 20 ), and to come into contact with the movable block ( 22 ) when the lens in contact with the polishing wheel ( 20 ) is polished to the desired polishing depth; and   the Hall sensor detection unit ( 30 ) in which a magnet ( 32 ) for detecting whether the movable block ( 22 ) and the carriage ( 12 ) are in contact and a Hall sensor ( 34 ) for detecting a strength of a magnetic field generated by the magnet ( 32 ) are mounted, respectively, on one of the carriage ( 12 ) or the movable blocks ( 22 ).