Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
1998-12-16
2001-12-18
Hudspeth, David (Department: 2651)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S275400, C369S053210
Reexamination Certificate
active
06331969
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical disk recording apparatus, an optical disk recording method, an optical disk and an optical disk reproduction apparatus, which are applicable to an apparatus of fabricating a compact disk, a compact disk and a compact disk player. According to the present invention, at a timing which does not effect influence on positional information of edge, by changing a width of a pit or a mark, without effecting influence on reproduction of a main data row constituted by a pit row or a mark row, a sub data row can be recorded reproducibly by an optical pick up for reproducing the main data row.
2. Description of Related Art
Conventionally, according to a compact disk, by subjecting a data row for recording to EFM modulation (Eight to Fourteen Modulation) after subjecting the data row to data processing, in respect of a predetermined basic period T, a pit row of 3T through 11T is formed by which audio data or the like is recorded.
In contrast thereto, at a lead in area on an inner peripheral side thereof, a record region of data for control is formed and by TOC (Table of Contents) recorded at this record region, desired musical play or the like can selectively be reproduced.
In this way, according to a compact disk recorded with various data, only an inner peripheral side of a lead in area, codes indicating maker, place of fabrication, disk number and so on are inscribed by which history or the like of the compact disk can be confirmed by optical observation.
In the meantime, according to such an inscription, it seems that by being able to confirm the history of the compact disk, an illegal copy can be identified by presence or absence of the inscription. However, the inscription is provided with a drawback in which it is difficult to reproduce the inscription by an optical pick up of a compact disk player since confirmation by optical observation is aimed at. Accordingly, when an illegal copy is identified by an inscription, after all, an exclusive reproduction mechanism is separately needed for reproducing the inscription.
In this case, it seems that when the above information reproducible by an optical pick up for reproducing audio data can be recorded without effecting influence on reproduction of audio data constituted by a pit row, an illegal copy can be excluded by utilizing the subcode.
SUMMARY OF THE INVENTION
The present invention has been carried out in consideration of the above-described point and it is an object of the present invention to propose an optical disk recording apparatus, an optical disk recording method, an optical disk formed thereby and an optical disk reproduction apparatus for reproducing the optical disk capable of recording sub information reproducibly by an optical pick up for reproducing data constituted by a pit row or the like without effecting influence on reproduction of data constituted by a pit row or the like.
In order to resolve such a problem, according to the present invention, in application of an optical disk recording apparatus and an optical disk recording method, with respect to a pit or a mark having a predetermined length or longer, a width of the pit or the mark is varied at a timing separated by a predetermined distance from a timing in correspondence with an edge of the pit or the mark based on a subcode.
Further, in application to an optical disk, with respect to a pit or a mark having a predetermined length or longer, a width of the pit or the mark is modulated at a modulating portion separated from an edge by a predetermined distance and a sub data row is recorded.
Further, in application to an optical reproduction apparatus, a signal level of a reproduction signal is detected to thereby provide a result of detecting the signal level, an average value of the result of detecting the signal level is identified and a sub data row is reproduced.
In application to an optical disk recording apparatus and an optical disk recording method, with respect to a pit or a mark having a predetermined length or longer, when a width of the pit or the mark is varied at a timing separated by a predetermined distance from a timing in correspondence with an edge of the pit or the mark based on a subcode, sub data can be recorded by the width of the pit or the mark without effecting influence on reproduction in respect of the timing of the edge of the pit or the mark. In this way, subcode can be recorded reproducibly by an optical pick up for reproducing data constituted by the pit row or the like without effecting any influence on the reproduction of data constituted by the pit row or the like.
Further, in application to an optical disk, with respect to a pit or a mark having a predetermined length or longer, when a width of the pit or the mark is modulated at a modulating portion separated from an edge by a predetermined distance and a sub data row is recorded, there can be provided an optical disk recorded with subcode by the width of the pit or the mark without effecting influence on reproduction in respect of a timing of the edge of the pit or the mark.
Further, in application to an optical disk reproduction apparatus, when a signal level of a reproduction signal is detected to thereby provide a result of detecting the signal level, an average value of the result of detecting the signal level is identified and a sub data row is reproduced, in addition to a constitution of reproducing main data recorded by pits or marks, subcode recorded by the width of the pit or the mark can be reproduced.
REFERENCES:
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patent: 5570339 (1996-10-01), Nagano
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Fujiki Toshihiro
Kobayashi Seiji
Chu Kim-Kwok
Frommer William S.
Frommer & Lawrence & Haug LLP
Hudspeth David
Kessler Gordon
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