Invention Grant
- Patent Title: Optical recording medium, reproduction apparatus, and tracking servo method
- Patent Title (中): 光记录介质,再现装置和跟踪伺服方法
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Application No.: US11101581Application Date: 2005-04-08
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Publication No.: US08223619B2Publication Date: 2012-07-17
- Inventor: Kunihiro Shioura , Shiro Morotomi , Minoru Tobita , Toshiya Murakami , Atsushi Umezawa
- Applicant: Kunihiro Shioura , Shiro Morotomi , Minoru Tobita , Toshiya Murakami , Atsushi Umezawa
- 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: JP2004-129380 20040426
- Main IPC: G11B7/24
- IPC: G11B7/24

Abstract:
A reproduction apparatus for an optical recording medium that has a convex pit recording layer, in which pits are formed in a convex shape viewed from a laser incidence side, and a concave pit recording layer, in which pits are formed in a concave shape viewed from the laser incidence side, as recording layers in which data is recorded by pit strings, the pits being formed with a depth that is set in a range of λ/4.5 to λ/6 with respect to a laser wavelength λ, including: an optical head section that irradiates laser beams on the recording layers and detects reflected light information to read out information recorded in the recording layers; a tracking error signal generating section that generates a tracking signal; a polarity switching section that switches a polarity of the tracking error signal; and a tracking servo section that performs a tracking servo operation.
Public/Granted literature
- US20050243697A1 Optical recording medium, reproduction apparatus, and tracking servo method Public/Granted day:2005-11-03
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