US Patent 7215609 Optical reproducing apparatus
Patent 7215609 was granted and assigned to Hitachi on May, 2007 by the United States Patent and Trademark Office.
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Patent Inventor Names
Hirofumi Sukeda0
Takeshi Shimano0
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Article (+618 characters)
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Patent abstract
An optical reproducing apparatus that uses a hologram laser module and is applicable to a DVD Multi drive, wherein five sub spots of light in total that are most suitable to perform the differential push-pull tracking both for DVD-RAM and for DVD-R/RW are irradiated on the disk, respectively, and influence of several sub spots that are unnecessary in recording and reproducing a disk is canceled out by calculation, to realize an optical head that is compatible with the DVD Multi drive using a hologram laser module, and thereby providing a small-size, high-performance optical reproducing apparatus.
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US Patent 07215609 Optical reproducing apparatus US Patent 7215609 Optical reproducing apparatus
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Patent Number
072156090
Patent Number
72156090
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Current Assignee
Patent Jurisdiction
Patent Number
072156090
Date of Patent
May 8, 2007
0Patent Application Number
102310010
Date Filed
August 30, 2002
0Official Website
Patent Primary Examiner
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US Patent 07215609 Optical reproducing apparatus
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07215609
Date of patent
May 8, 2007
Patent application number
10231001
Date Filed
August 30, 2002
Patent primary examiner
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