| 摘要 |
<p>A method for producing a mold for a zonal optical element having a circular portion (5) having a circular shape taking an optical axis as a center viewed from a plane surface (BF); at least one zonal surface (61) formed around the circular portion in a ring form; and boundary wall surfaces (62) connecting the circular portion with the zonal surface or connecting the zonal surfaces with each other is produced by a stage for forming a circular portion (5) where while rotating a work (W) around a rotation axis (T) corresponding to the optical axis as a center, a tip (11) is relatively moved relative to the work (W) to form the circular portion (5) at the mold side corresponding to the circular portion on the processing surface of the work perpendicular to the rotation axis (T); a stage for forming a zonal surface (61) where the tip is relatively moved relative to the work to form a zonal surface (61) at the mold side corresponding to the zonal surface (61) and a stage for forming a corner portion between the boundary portion at the mold side and the zonal surface at the mold side wherein a raked surface of the tip is in contact with a portion corresponding to the boundary wall surface.</p> |
