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Title:
OPTICAL ELEMENT FOR OPTICAL PICKUP
Document Type and Number:
Japanese Patent JP2011141945
Kind Code:
A
Abstract:

To provide an optical element for an optical pickup, prevented from a deterioration of its characteristics due to a temperature without an increase in the mass; so as to provide good optical characteristics.

The optical element for an optical pickup has: an objective lens 1 for focusing light flux; an aberration correction means for correcting aberration; and a holder for fixing relative positions of the objective lens 1 and the aberration correction means. The aberration correction means has a plurality of aberration correction elements 2 and 3 including a correction element 3 having negative power. The holder has: a first holder 32 for holding at least the aberration correction element 3 having the negative power; and a second holder 31 for holding at least the objective lens 1. The first holder 32 and the second holder 31 each include a plurality of forming gates at positions rotationally symmetric with respect to an optical axis.


Inventors:
EZAWA HIROSHI
Application Number:
JP2011034872A
Publication Date:
July 21, 2011
Filing Date:
February 21, 2011
Export Citation:
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Assignee:
OLYMPUS CORP
International Classes:
G11B7/12; G11B7/135
Domestic Patent References:
JPH06238711A1994-08-30
JP2002092926A2002-03-29
JPH08194146A1996-07-30
Attorney, Agent or Firm:
Kenji Sugimura
Groundwork Kenichi