Title:
METHOD FOR MACHINING MOLD, MOLD, AND OPTICAL ELEMENT FOR OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/133531
Kind Code:
A1
Abstract:
Provided is a method for machining a mold for molding an optical element such as an objective lens with compatibility for three kinds of optical disks such as BD/DVD/CD, said mold capable of minimizing the reduction of the efficiency of the optical element. Also provided are a machined mold and an optical element transcribed from the mold. By cutting a material by a tool provided with a cutting face at least 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.
Inventors:
OSANAI NAOKI (JP)
AKIYAMA KOUJI (JP)
AKIYAMA KOUJI (JP)
Application Number:
PCT/JP2012/058143
Publication Date:
October 04, 2012
Filing Date:
March 28, 2012
Export Citation:
Assignee:
KONICA MINOLTA ADVANCED LAYERS (JP)
OSANAI NAOKI (JP)
AKIYAMA KOUJI (JP)
OSANAI NAOKI (JP)
AKIYAMA KOUJI (JP)
International Classes:
B29C33/38; B23B5/00; B29C33/42; G11B7/135; G11B7/22; B29L11/00
Foreign References:
| JPH1110401A | 1999-01-19 | |||
| JP2003062707A | 2003-03-05 | |||
| JP2001129702A | 2001-05-15 | |||
| JPS62102901A | 1987-05-13 |
Attorney, Agent or Firm:
TAMURA Keijiro et al. (JP)
Keijichiro Tamura (JP)
Keijichiro Tamura (JP)
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Claims:
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