| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for machining a mold, a machined mold and an optical element transcribed from the mold; wherein the mold is for use in the molding of an optical element like an objective lens compatible with three kinds of optical disks e.g. BD/DVD/CD, and minimizes the efficiency reduction of an optical element as much as possible. <P>SOLUTION: By cutting a material by a tool provided with a cutting face at least a part of which is outlined by a linear first edge and a second edge extending in the direction crossing the first edge, the first edge being set to be inclined with respect to a rotation axis, a first peripheral face cut by the first edge becomes parallel to the rotation axis. Therefore, if an optical element is transcribed using a thus formed mold, the first peripheral face can be made parallel to the optical axis. <P>COPYRIGHT: (C)2013,JPO&INPIT |
