Title:
OBJECTIVE LENS, OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE, OPTICAL DISK SYSTEM, AND METHOD FOR INSPECTING OBJECTIVE LENS
Document Type and Number:
WIPO Patent Application WO/2021/199487
Kind Code:
A1
Abstract:
This objective lens has a numerical aperture of 0.85 or more, and a substrate thickness th at which the third-order spherical aberration becomes minimum when substantially parallel optical beams are incident on the objective lens, and a substrate thickness tm at which the total aberration becomes minimum when the third-order spherical aberration is made minimum by changing the parallelism of the optical beams to be incident on the objective lens from a parallel state are different.
Inventors:
KOMMA YOSHIAKI
TAKAHASHI YUICHI
TAKAHASHI YUICHI
Application Number:
PCT/JP2020/042740
Publication Date:
October 07, 2021
Filing Date:
November 17, 2020
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G02B13/00; G02B13/18; G11B7/09; G11B7/135; G11B7/1374
Domestic Patent References:
WO2010047093A1 | 2010-04-29 | |||
WO2008149522A1 | 2008-12-11 |
Foreign References:
JP2010244648A | 2010-10-28 | |||
JP2008165961A | 2008-07-17 |
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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