Invention Grant
- Patent Title: High density optical disc having small track pitch
- Patent Title (中): 具有小轨道间距的高密度光盘
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Application No.: US12156349Application Date: 2008-05-30
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Publication No.: US07706245B2Publication Date: 2010-04-27
- Inventor: Sohmei Endoh , Noriyuki Saito , Takahiro Igari , Takeshi Gouko , Shinji Minegishi , Eijiro Kikuno
- Applicant: Sohmei Endoh , Noriyuki Saito , Takahiro Igari , Takeshi Gouko , Shinji Minegishi , Eijiro Kikuno
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: Sony Corporation,Sony Disc and Digital Solutions, Inc.
- Current Assignee: Sony Corporation,Sony Disc and Digital Solutions, Inc.
- Current Assignee Address: JP Tokyo JP Tokyo
- Agency: Rockey, Depke & Lyons, LLC
- Agent Robert J. Depke
- Priority: JP2005-230408 20050809
- Main IPC: G11B7/24
- IPC: G11B7/24

Abstract:
A recording method whereby an inorganic resist made of an incomplete oxide of a transition metal is formed as a film onto a substrate and a latent image corresponding to pits is formed onto the inorganic resist by exposure. The exposure is performed by a laser beam whose intensity has been modulated by a pulse signal whose pulse height decreases in a rear portion in a length direction of the pit, thereby forming a format of a track pitch smaller than a recording beam diameter (track pitch/exposure beam diameter=0.333 to 0.833).
Public/Granted literature
- US20080310294A1 Recording method, master for optical disk, and optical recording medium Public/Granted day:2008-12-18
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