Title:
OPTICAL ELEMENT AND OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/069031
Kind Code:
A1
Abstract:
In an objective lens (OL), birefringence is generated, and wavefront aberration
is generated in light outputted from the objective lens (OL) due to the birefringence.
When an astigmatic component of the wavefront aberration is generated by 10mλrms
or more, a coating objective lens (COL) is provided with a dielectric multilayer
(MLR) for reducing the astigmatic component to 5mλrms or lower.
Inventors:
TADA KAZUNARI (JP)
OGAWA YOUICHI (JP)
MUSHIAKE NOBUO (JP)
NISHI KAZUYUKI (JP)
OGAWA YOUICHI (JP)
MUSHIAKE NOBUO (JP)
NISHI KAZUYUKI (JP)
Application Number:
PCT/JP2007/072723
Publication Date:
June 12, 2008
Filing Date:
November 26, 2007
Export Citation:
Assignee:
KONICA MINOLTA OPTO INC (JP)
TADA KAZUNARI (JP)
OGAWA YOUICHI (JP)
MUSHIAKE NOBUO (JP)
NISHI KAZUYUKI (JP)
TADA KAZUNARI (JP)
OGAWA YOUICHI (JP)
MUSHIAKE NOBUO (JP)
NISHI KAZUYUKI (JP)
International Classes:
G02B5/30; G02B1/11; G02B1/115; G02B13/00; G11B7/135; G11B7/1374
Domestic Patent References:
| WO2003060892A2 | 2003-07-24 | |||
| WO2004095444A1 | 2004-11-04 |
Foreign References:
| JP2001318231A | 2001-11-16 | |||
| JP2005190615A | 2005-07-14 |
Attorney, Agent or Firm:
SANO, Shizuo (2-6 Tenmabashi-Kyomachi, Chuo-Ku,Osaka-Sh, Osaka 32, JP)
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