Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
1998-08-14
2001-03-27
Hindi, Nabil (Department: 2651)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S044130
Reexamination Certificate
active
06208614
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a recording medium having land and groove tracks, and more particularly to a recording medium that is adapted to record an information on both the land tracks and the groove tracks.
2. Description of the Prior Art
Recently, an optical recording medium, an optical magnetic recording medium and so on have been developed as a recording medium for recording various information such as video and audio information, etc. and are commercially available in the market. Such an optical recording medium includes a read-only type disc such as CD, CD-ROM, DVD-ROM, etc., a write-once-read-many type disc such as CD-R, DVD-R, etc., and a rewritable type disc such as CD-RW, DVD-RAM, etc.
In the conventional rewritable disc, it is previously recorded an identified (hereinafter “ID”) information including an address (or position) information allowing an information to be recorded in the desired position. Actually, the optical disc such as CD-R, etc., as shown
FIG. 1
, includes a land and groove signal tracks
10
and
12
formed thereon. Also, the ID information including the address information, etc. is preformatted on the optical disc by wobbling the groove track
12
in accordance with a carrier which the ID information is frequency-modulated.
The address information can be obtained from a wobbling signal picked-up from the wobbled groove signal track
12
and the information can be recorded at the desired position on the disc by the obtained address information. In the optical disc having such structure, a recording capacity is limited because the information is recorded on only the groove track
12
.
Also, an optical disc such as DVD-RAM and so on, as shown
FIG. 2
, is known as the information can be recorded on all of land and groove signal tracks
10
and
12
. The optical disc comprises a header field having the ID information of address information, etc. recorded in a pre-pit train and a recording field consisting of any one of the land and groove signal track
10
and
12
wobbled in the same phase. In this disc, since the information can be not recorded on the header field consisting of the pre-pit train, the recording capacity is limited. As described above, the prior recording medium make to decrease an amount of information to be recorded on recordable area.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a recording medium that is capable of increasing an amount of recordable information.
It is other object of the present invention to provide a recording medium that is capable of maximizing an amount of information to be recorded on all of the land and groove signal tracks.
It is another object of the present invention to provide an information recording and reproducing apparatus that is capable of performing information record and reproduction for the above recording medium.
In order to achieve this and other objects of the invention, a recording medium according to the present invention includes a signal track being wobbled in a predetermined frequency and having first and second wobbling areas. First wobbling area comprises a readable identified information, while second wobbling area has a non-readable identified information. Also, first and second wobbling areas is alternatively arranged.
REFERENCES:
patent: 5936933 (1999-08-01), Miyamoto et al.
patent: 6064643 (2000-05-01), Tanoue et al.
patent: 6069870 (2000-05-01), Maeda et al.
Hindi Nabil
LG Electronics Inc.
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