Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2007-01-23
2007-01-23
Neyzari, Ali (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S275300
Reexamination Certificate
active
10490335
ABSTRACT:
The S/N ratio is improved for recording data to grooves (2-1,2-2) of an optical disc so that as much information as possible can be recorded at the lowest possible frequency band. An optical disc using wobble patterns to record different information has a first groove (2-1) having a first wobble pattern (22) in which one wobble period has a sharp rising edge and a gradual falling edge; and a second groove (2-2) having a second wobble pattern (24) in which one wobble period has a gradual rising edge and a sharp falling edge. Each of the first and the second wobble pattern is represented by a first fundamental and a second harmonic of a Fourier series. The polarity of the second harmonic, which is an even harmonic, of the second wobble pattern is opposite that of the first wobble pattern. A method for manufacturing this optical disc is also provided.
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Minamino et al., “Practical Study of Saw-Tooth Wobble Addressing by Theoretical and Experimental Approaches”, Japanese Journal of Applied Physics, vol. 41, No. 3B, Nov. 2001, XP-002219543, pp. 1741-1742.
Furumiya Shigeru
Heemskerk Jacobus Petrus Josephus
Ishibashi Hiromichi
Masuhara Shin
Minamino Jun-ichi
Koninklijke Philips Electronics , N.V.
Neyzari Ali
Sony Corporation
Wenderoth , Lind & Ponack, L.L.P.
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