US Patent 7978569 Optical disc device and focus control method
Patent 7978569 was granted and assigned to Sony on July, 2011 by the United States Patent and Trademark Office.
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Patent abstract
A focus control section first performs a reference focus control process in which a reference optical beam is focused on a reference layer of an optical disc according to the result of receiving a reference reflection optical beam, and then switches from the reference focus control process to an information focus control process in which an information optical beam is focused on a mark layer of the optical disc according to the result of receiving an information reflection optical beam.
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Patent Inventor Names
Hirotaka Miyamoto0
Kimihiro Saito0
Kunihiko Hayashi0
Toshihiro Horigome0
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US Patent 07978569 Optical disc device and focus control method US Patent 7978569 Optical disc device and focus control method
Infobox
Patent Number
079785690
Patent Number
79785690
Edits on 27 Mar, 2023
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Infobox
Is a
Current Assignee
0
Patent Jurisdiction
Patent Number
079785690
Date of Patent
July 12, 2011
0Patent Application Number
123629270
Date Filed
January 30, 2009
0Patent Primary Examiner
Edits on 8 Dec, 2021
Golden AI
Edits made to:
Infobox (+8 properties)
US Patent 07978569 Optical disc device and focus control method
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07978569
Date of patent
July 12, 2011
Patent application number
12362927
Date Filed
January 30, 2009
Patent primary examiner
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