Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
2002-06-24
2004-05-04
Hindi, Nabil (Department: 2655)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
Reexamination Certificate
active
06731575
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related with a control information recording method and apparatus for recording in advance, onto an information record medium of WO (Write Once) type (hereafter, referred to as a DVD-R (Digital Video or Versatile Disk-Recordable)) among information record media whose recording densities are dramatically improved over conventional CDs (Compact Disks) and the like represented by the DVD, control information such as address information, a synchronization information etc. (hereafter, referred to as “pre-information”) required to record and reproduce the substantial record information such as video information and audio information to and from the DVD-R. The present invention is also related with an information recording method and apparatus for recording the record information onto the DVD-R while reproducing the pre-information from the DVD-R on which the pre-information has been already recorded.
2. Description of the Related Art
In an information record medium such as a WO type postscript optical disk and the like, the pre-information for a position retrieval at a time of writing the record information is recorded in advance onto the information record medium at a pre-format stage in manufacturing the information record medium. As a method of pre-formatting this pre-information, an information record track (a groove track or a land track) for recording the record information is wobbled in a form of a wave so as to record the pre-information. Alternatively, a pre-pit is formed on a portion different from a portion where the record information is recorded on the information record track, so as to record the pre-information.
However, in a case of the pre-format of the pre-information by the wobbling, the information record track itself is swung to the right and left relative to a rotation direction of the information record medium on the basis of a wobbling signal. This results in a problem that a C/N ratio (Carrier to Noise ratio) is poor because of a restriction in a modulation degree of the wobbling signal (wobbling amplitude) due to a relation to an adjacent information record track. Further, considering an interference resulting from the adjacent information record track since the adjacent information record tracks are close to each other by the wobbling, it is difficult to make a trackpitch narrow. This results in a problem of limitation in improvement of the recording density.
On the other hand, in a case of the pre-format of the pre-information by the pre-pit, since the pre-pit is formed on the information record track, the recordable amount of the substantial record information is reduced by the amount of the formed pre-pit. This results in a problem of a poor utilization efficiency of a disk record surface.
SUMMARY OF THE INVENTION
Then, the present invention is proposed from the viewpoint of the above mentioned problems. It is therefore an object of the present invention to provide a method of and an apparatus for recording control information (i.e. pre-information) to an information record medium, a method of and an apparatus for recording record information to the information record medium to which the control information is recorded in advance, and the information record medium to which the control information is recorded in advance, which can improve a recording density of the record information and an accuracy in the reproduction of the record information.
The above object of the present invention can be achieved by a first method of recording, onto a guide track of an information record medium, control information to control at least one of recording and reproducing operations of record information on the information record medium. The first method is provided with the steps of: generating a control information timing signal one after another at an interval corresponding to a length of a control information unit equal to an N (N: predetermined integer not less than 2) multiple of a length of a record information unit of the record information; and recording the control information onto the guide track of the information record medium, on the basis of a timing corresponding to the control information timing signal.
According to the first method of the present invention, the control information timing signal is generated one after another at the interval corresponding to the length of the control information unit equal to the N multiple of the length of the record information unit. Then, the control information is recorded onto the guide track of the information record medium, on the basis of the timing corresponding to the control information timing signal. Thus, as compared with a case that the control information is recorded for all of the record information unit, the amount of the control information recorded on the whole information record medium can be reduced by the factor of 1/N, and that the recording density of the record information can be certainly improved. Further, it is possible to easily form a recording layer with a desirable thickness on the information record medium to which the control information has been recorded in advance.
In one aspect of the first method, the control information is pre-information including at least address information indicative of a record position on the information record medium of the record information, the record information unit is one synchronization frame, and in the generating step, the control information timing signal is generated by doubling said one synchronization frame.
According to this aspect of the first method, since the control information timing signal is generated by doubling said one synchronization frame, the pre-information is recorded once per two synchronization frames. Thus, as compared with a case that the pre-information is recorded for all of the synchronization frames, the amount of the pre-information recorded on the whole information record medium can be reduced by half, and that the recording density of the record information can be certainly improved. Further, it is possible to easily form a recording layer with a desirable thickness on the information record medium to which the pre-information has been recorded in advance.
In another aspect of the first method, the control information has a length along the guide track equal to an integer multiple of a unit length corresponding to a pit interval along the guide track defined by a recording format of the record information, for a record pit to be formed on the information record medium in correspondence with the record information in the recording operation, and in the recording step, the control information is recorded for each control information unit, by a control information pit having a length shorter along the guide track than the shortest pit length of the record pit.
According to this aspect of the first method, since the control information is recorded for each control information unit, by the control information pit having the length shorter than the shortest pit length of the record pit, the control information is recorded to have a pit length different from any pit length of the record information. Thus, it is possible to easily separate the record information and the control information from each other in the reproducing operation.
In another aspect of the first method, in the generating step, the control information timing signal is generated at such an interval that positions of the control information recorded on adjacent turns of the guide track are not on a straight line perpendicular to the guide track on the information record medium.
According to this aspect of the first method, since the control information timing signal is generated at such an interval that positions of the control information recorded on adjacent turns of the guide track are not on the straight line perpendicular to the guide track on the information record medium, it is possible to prevent the control information on the adjacent turns of the guide track from interfer
Inoue Akiyoshi
Kuroda Kazuo
Ohira Hiroyuki
Suzuki Toshio
Taniguchi Shoji
Hindi Nabil
Pioneer Display Products Corporation
Pitney Hardin Kipp & Szuch LLP
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