Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2008-12-04
2010-11-02
Dinh, Tan X (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044130, C369S275400, C369S059250
Reexamination Certificate
active
07826314
ABSTRACT:
An apparatus for reading subdivided information from an optical disk, which comprises a track groove and on which information is recorded along the track groove is disclosed. The apparatus includes an optical head, which irradiates the optical disk with light and generates an electric signal responsive to part of the light that has been reflected from the optical disk, read signal processing means for generating a wobble signal which has an amplitude changing with the wobble pattern from the electric signal, rise value acquiring means for sampling and holding an absolute gradient value of the wobble signal when the signal rises, fall value acquiring means for sampling and holding an absolute gradient value of the wobble signal when the signal falls, and subdivided information detecting means for determining the subdivided information by majority by comparing the values held by the rise and fall value acquiring means with each other.
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Office Action dated Aug. 6, 2010 in U.S. Appl. No. 12/327,891.
Furumiya Shigeru
Gushima Toyoji
Ishibashi Hiromichi
Ishida Takashi
Minamino Jun-ichi
Dinh Tan X
Panasonic Corporation
Panitch Schwarze Belisario & Nadel LLP
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