Lens-processing device

Abstract

A lens processing device ( 1 ) is adapted such that a lens ( 11 ) is sucked and held by a lens holder ( 12 ) rotatably and rockably supported on the front end of a lens holder shaft ( 13 ) through a pivot bearing mechanism ( 14 ) and then such that a lens surface ( 11 a ) is processed by moving the lens ( 11 ) and a lens processing tool ( 31 ) relative to each other with the lens processing tool ( 31 ) pressed to the lens ( 11 ). The lens ( 11 ) can be moved along a desired trajectory on a vertical plane containing a Z-axis and an X-axis, which are perpendicular to each other, by controlling feeding of the lens holder ( 12 ) in the Z-axis and X-axis directions by means of a Z-axis movement mechanism ( 19 ) and an X-axis movement mechanism ( 15 ). Thus, the lens surface ( 11 a ) can be processed with the lens ( 11 ) horizontally pressed to a circular arc-shaped processing surface ( 31 a ) of the lens processing tool ( 31 ).

1 . A lens-processing device, characterized in comprising:
 a lens-holder shaft extending in a vertical direction;   a lens holder capable of rotating and oscillating about a pivot bearing, the lens holder being attached coaxially and in a downward orientation to a lower end of the lens-holder shaft interposed by the pivot bearing;   a Z-axis movement mechanism for moving the lens-holder shaft in a Z-axis direction, the Z-axis direction being the vertical direction;   an X-axis movement mechanism for moving the lens-holder shaft in an X-axis direction, the X-axis direction being a horizontal direction;   a lens-processing tool having a convex or concave circular-arc shaped processing surface positioned in an upward orientation for processing a lens held by the lens holder;   a θ-axis-swiveling mechanism for causing the lens-processing tool to swivel about a θ-axis, the θ-axis extending in a horizontal direction perpendicular to the X-axis;   a lens-processing-tool-rotating mechanism for causing the lens-processing tool to rotate about a center axis of the lens-processing tool, the center axis passing through the θ-axis; and   drive-control means for controlling driving of the X-axis movement mechanism, the Z-axis movement mechanism, and the θ-axis-swiveling mechanism; and controlling movement in the X-axis direction of the lens holder attached to the lens-holder shaft, movement of the lens holder in the Z-axis direction, and swiveling of the lens-processing tool about the θ-axis, whereby a plurality of types of lens-processing modes are executed.   
     
     
         2 . The lens-processing device according to  claim 1 , characterized in that the lens-processing modes of the drive-control means comprise a lens-processing mode for controlling driving of the X-axis movement mechanism, the Z-axis movement mechanism, and the θ-axis-swiveling mechanism so that the lens to be processed is pressed from above in a horizontal state onto the circular-arc-shaped processing surface of the lens-processing tool, the lens being held on a lens-holding surface of the lens holder, and the lens-processing tool swiveling about the θ-axis. 
     
     
         3 . The lens-processing device according to  claim 2 , characterized in comprising a Y-axis movement mechanism for moving the lens-processing tool in a direction of a Y-axis, the Y-axis being parallel to the θ-axis.