Invention Grant
US07889621B2 Objective lens device, optical pickup device, optical-disc driving device and driving method of objective lens
失效
物镜装置，光学拾取装置，光盘驱动装置以及物镜的驱动方法
- Patent Title: Objective lens device, optical pickup device, optical-disc driving device and driving method of objective lens
- Patent Title (中): 物镜装置，光学拾取装置，光盘驱动装置以及物镜的驱动方法
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Application No.: US11871420Application Date: 2007-10-12
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Publication No.: US07889621B2Publication Date: 2011-02-15
- Inventor: Noriaki Nishi , Kenji Yamamoto , Takahiro Miyagi , Fumiaki Nakano
- Applicant: Noriaki Nishi , Kenji Yamamoto , Takahiro Miyagi , Fumiaki Nakano
- Applicant Address: JP Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-123081 20070508
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
An objective lens device includes: a first objective lens having a first numerical aperture, which can condense light into a disc-shaped first optical recording medium including a first cover layer of first thickness; a second objective lens having a second numerical aperture which is smaller than the first numerical aperture, which can condense light into a disc-shaped second optical recording medium including a second cover layer of second thickness which is thicker than the first thickness; a third objective lens having a third numerical aperture which is smaller than the second numerical aperture, which can condense light into a disc-shaped third optical recording medium including a third cover layer of third thickness which is thicker than the second thickness; and a lens holder configured to integrally hold the first, second, and third objective lenses.
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