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Etsufumi Yamamoto
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Chiba, JP
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last 30 patents
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Patent Grant
Optical disc apparatus and tracking error signal calculation circuit
Patent number
6,134,198
Issue date
Oct 17, 2000
Sony Corporation
Etsufumi Yamamoto
G11 - INFORMATION STORAGE
Information
Patent Grant
Apparatus and method for controlling rotational speed during a paus...
Patent number
6,130,868
Issue date
Oct 10, 2000
Sony Corporation
Etsufumi Yamamoto
G11 - INFORMATION STORAGE
Information
Patent Grant
Method of adjusting optics of optical pickup using error negating s...
Patent number
5,606,537
Issue date
Feb 25, 1997
Sony Corporation
Etsufumi Yamamoto
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup device for a recording and/or reproducing apparatus
Patent number
5,181,193
Issue date
Jan 19, 1993
Sony Corporation
Hidehiro Kume
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Information
Patent Grant
Tracking error signal generator with DC offset cancellation
Patent number
5,181,195
Issue date
Jan 19, 1993
Sony Corporation
Hidehiro Kume
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup device
Patent number
5,144,614
Issue date
Sep 1, 1992
Sony Corporation
Hidehiro Kume
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup device
Patent number
4,897,828
Issue date
Jan 30, 1990
Sony Corporation
You Yoshitoshi
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Information
Patent Grant
Optical pickup device
Patent number
4,893,296
Issue date
Jan 9, 1990
Sony Corporation
Yoshiyuki Matsumoto
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