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Patent Searching and Data


Title:
OBJECTIVE LENS, OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/085452
Kind Code:
A1
Abstract:
In an objective lens to be used for an optical pickup device, one plane of a lens having power is provided with a superposing structure wherein a first optical path difference giving structure and a second optical path difference giving structure are superposed. In the first optical path difference giving structure, a spherical aberration changes in an insufficient correction direction when a wavelength of an entering luminous flux is longer, and in the second optical path difference giving structure, the spherical aberration changes in an excess correction direction when the wavelength of the entering luminous flux is longer.

Inventors:
KIMURA TOHRU (JP)
NOMURA EIJI (JP)
Application Number:
PCT/JP2006/301542
Publication Date:
August 17, 2006
Filing Date:
January 31, 2006
Export Citation:
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Assignee:
KONICA MINOLTA OPTO INC (JP)
KIMURA TOHRU (JP)
NOMURA EIJI (JP)
International Classes:
G02B13/00; G11B7/135; G02B13/18
Foreign References:
JP2004264815A2004-09-24
JP2004247025A2004-09-02
JP2004326861A2004-11-18
JP2004362626A2004-12-24
US20030053223A12003-03-20
EP1276104A22003-01-15
Other References:
See also references of EP 1855274A4
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