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Patent Searching and Data


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 (Inc. 2970 Ishikawa-machi, Hachioji-sh, Tokyo 05, 1928505, JP)
多田 一成 (〒05 東京都八王子市石川町2970 コニカミノルタオプト株式会社内 Tokyo, 1928505, JP)
OGAWA, Youichi (Inc. 2970 Ishikawa-machi, Hachioji-sh, Tokyo 05, 1928505, JP)
小川 洋一 (〒05 東京都八王子市石川町2970 コニカミノルタオプト株式会社内 Tokyo, 1928505, JP)
Application Number:
JP2007/072723
Publication Date:
June 12, 2008
Filing Date:
November 26, 2007
Export Citation:
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Assignee:
Konica Minolta Opto, Inc. (2970, Ishikawa-machi Hachioji-sh, Tokyo 05, 1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町2970 Tokyo, 1928505, JP)
TADA, Kazunari (Inc. 2970 Ishikawa-machi, Hachioji-sh, Tokyo 05, 1928505, JP)
多田 一成 (〒05 東京都八王子市石川町2970 コニカミノルタオプト株式会社内 Tokyo, 1928505, JP)
OGAWA, Youichi (Inc. 2970 Ishikawa-machi, Hachioji-sh, Tokyo 05, 1928505, JP)
International Classes:
G02B5/30; G02B1/10; G02B1/11; G02B13/00; G11B7/135
Domestic Patent References:
2003-07-24
2004-11-04
Foreign References:
JP2001318231A2001-11-16
JP2005190615A2005-07-14
Attorney, Agent or Firm:
SANO, Shizuo (Tenmabashi-Yachiyo Bldg. Bekkan, 2-6 Tenmabashi-Kyomachi, Chuo-Ku,Osaka-Sh, Osaka 32, 5400032, JP)
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