Manufacturing method of optical component or molding die therefor

A method of manufacturing an optical component or a molding die for the optical component, the method comprising the steps of:

• cutting a surface of a work with a tool by rotating the tool around its axis with a cutting edge facing outward and moving in a circle to cut the work surface at a point of the circle while relatively moving the tool and the work in a line direction crossing to the axis of the tool at a predetermined feed speed;
• and
• cutting the work surface in a next line after relatively moving the tool and the work in a pitch direction perpendicular to the line direction by a pick feeding distance;
• wherein the above steps are carried out under the following conditions:
• 10000≦S≦50000;
• (F/S)2/8D≦10 nm;
• f2/8r≦10 nm,
• where
• S:
• tool rotation speed (rpm);
• F:
• feed speed (mm/min);
• D:
• rotating radius of a cutting edge of a tool (mm);
• f:
• pick feeding distance (mm);
• r:
• nose radius of a cutting edge of a tool (mm).

A manufacturing method of an optical component or a molding die of the optical component comprising the steps of:

• cutting a surface of a work with a tool by rotating the tool around its axis with a cutting edge facing outward and moving in a circle to cut the work surface at a point of the circle while relatively moving the tool and the work in a line direction crossing to the axis of the tool at a predetermined feed speed;
• cutting the work surface by a next line after relatively moving the tool and the work in a pitch direction perpendicular to the line direction by a pick feeding distance;
• and
• polishing a worked surface after completion of the cutting steps,
• wherein the above cuttings are carried out under the following conditions:
• 10000≦S≦30000;
• (F/S)2/8D≦40 nm;
• f2/8r≦40 nm,
• where
• S:
• tool rotation speed (rpm);
• F:
• feed speed (mm/min);
• D:
• rotation radius of a cutting edge of a tool (mm);
• f:
• pick feeding distance (mm);
• r:
• nose radius of a cutting edge of a tool (mm).