Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
1998-07-21
2001-07-03
Hindi, Nabil (Department: 2753)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S275300, C369S044130
Reexamination Certificate
active
06256282
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical recording medium, such as an optical disk or the like and a recording method thereof and more particularly to an optical disk on which address information is recorded by wobbling a pre-groove.
2. Description of the Related Art
To record data on a disk, address information must be recorded to enable data to be recorded at a predetermined position. The address information is sometimes recorded by wobbling.
An example of the method to record the above-mentioned wobbling information on a track of a disk is disclosed in the U.S. Pat. No. 4,942,565.
That is, a track on which data is recorded is in the form of a pre-groove which is previously formed. The side wall of the pre-groove is wobbled (allowed to meander) is response to the address information.
Thus, the address can be read from the wobbling information. Therefore, even if bit data or the like indicating the address is not previously formed on the track, data can be recorded or reproduced to and from a required position.
The foregoing optical recording medium is required to have a large capacity while maintaining reliability of a recording/reproducing operation. Therefore, suggestion of an appropriate recording density has been required.
Moreover, it is preferred to realize such a matter that the process which is performed by a recording/reproducing apparatus can be performed easily, and also that compatibility with a disk of another type in terms of a medium and an apparatus is required.
For example, a disk called a “DVD-ROM (Digital versatile Disc ROM/Digital Video Disc ROM) has been developed as a preferred optical disk for use in the multimedia. A rewritable recording medium having compatibility with the DVD-ROM and which does not complicate recording/reproducing apparatus is required.
As a matter of course, the disk itself must have a function for determining the type of the disk in consideration a of the compatibility.
SUMMARY OF THE INVENTION
An object of the present invention is to solve the above-mentioned problems and provide a novel optical recording medium and the recording method thereof.
To th is end, according to the present invention, an optical recording medium is provided in which a track on which data is recorded is previously formed and the track is wobbled with a signal obtained by frequency-modulating a carrier having a predetermined frequency in correspondence with address information, wherein an amount of an amplitude of wobbling of the track is made to be a value within a range from 10 nm to 15 nm and a track pitch of the track is made to be a value within a range from 0.74 &mgr;m to 0.82 &mgr;m.
The above-mentioned values enable a predetermined data recording capacity on the optical recording medium under a condition of a predetermined NA and wavelength of laser. Moreover, the relationship between the amount of the amplitude of wobbling and the track pitch is made to be a value with which a satisfactory reproduction error rate of address information and reproduction information can be obtained.
The track on which data is recorded is previously formed, the track is wobbled with a signal obtained by frequency-modulating a carrier having a predetermined frequency in accordance with address information,and the wobbling serving as address information is formed in correspondence with rotations having a constant angular velocity. Information which enables the type of a recording medium to be identified is recorded as administration information.
The optical recording medium has a structure that zoning of the track is set such that data can be recorded at a substantially constant linear density, an area on which administration information of the optical recording medium is recorded is formed at a predetermined position on the optical recording medium and recommended information for a recording/reproducing operation at least at an internal position and an external position is recorded as administration information.
As administration information, values of a track pitch and a central linear density are recorded or information which enables the track pitch and the central linear density to be distinguished is recorded.
That is, the recording/reproducing apparatus is enabled to recognize a preferred recording/reproducing condition with respect to the optical recording medium and identify the physical properties of the optical recording medium.
An optical recording medium in which a track on which data is recorded is formed previously, and the track is wobbled with a signal obtained by frequency-modulating a carrier having a predetermined frequency in response to address information is provided, wherein recording is performed in such a manner that a linking section is formed between a data block serving as a data recording unit on the track and an adjacent data block, and the data size of the linking section is made to be the same as a minimum data unit for constituting the data block.
As a result, a process for a linking section required to constitute a rewritable structure can be facilitated.
[C] Logical Format of Optical Disk
C-1: Sector Format
C-2: Linking Section
C-3: Frame Synchronizing Signal
C-4: Reason of Setting Linking Section
[D] Zoning Format
[E] Recording/Reproducing Apparatus
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Kobayashi Shoei
Ogihara Koichiro
Takeda Toru
Yamagami Tamotsu
Frommer William S.
Frommer Lawrence & Haug LLP.
Hindi Nabil
Smid Dennis M.
Sony Corporation
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