Dynamic information storage or retrieval – Binary pulse train information signal – Format arrangement processing for auxiliary information
Reexamination Certificate
2000-01-17
2002-11-05
Young, W. R. (Department: 2653)
Dynamic information storage or retrieval
Binary pulse train information signal
Format arrangement processing for auxiliary information
C369S047230, C369S059260, C369S059250, C369S047280
Reexamination Certificate
active
06477127
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a recording/playback apparatus for an optical disk for recording and playing back data signal on/from the recordable/reproducible optical disk such as CD-R, CD-RW, DVD and the like and an optical disk(disc) therefor.
2. Description of the Related Art
Recently, a demand for a large capacity optical disk capable of recording a large amount of data has been rising and to meet such a demand, for example, such an optical disk as DVD-R has appeared. In this optical disk, there has been demanded a recording method in which when new data is additionally recorded subsequent to an already recorded area (“additional recording”, “linking”, “after recording”), new data is recorded finely not so as to produce a waste data, thereby using the capacity of the optical disk to a maximum extent.
However, at a border between old and new data in a linking portion on a conventional recordable/reproducible optical disk described above, old and new data needs to be linked at a higher accuracy than a rotation accuracy of a spindle motor for rotating the optical disk (for example, the linking accuracy needs to be 10,000 times the rotation accuracy). Thus, a deviation of rotating phase of the spindle motor (for example, wow and flutter) affects the accuracy badly. Further, in case where an optical disk containing old data is recorded with other recording unit, a deviation of the rotating phase between the spindle motors of different recording units having old and new data respectively affects the linking accuracy more badly.
As a result, a timing between a recording termination point of old data and a linking start point deviates so that a large gap occurs between the recording termination point and linking start point, or the linking start point is located in front of(before) the recording termination point. Consequently, a non-recorded gap is produced between old and new data so that incontinuity occurs between the old and new data, or a beginning of the new data is written over a rear portion of the old data.
As described above, the new data may not be recorded continuously with the old data, thereby leading to a cause for an error which may occur when the old and new data are played back continuously.
As a method for preventing such an error, a method in which the linking is started apart by a predetermined length from a final end of an area in which the old data is recorded has been employed since before.
FIGS. 1A
,
1
B show an example of a conventional linking method as such a preventing method.
In concentrically or spirally formed tracks of a recordable/reproducible optical disk such as CD-R, CD-RW and DVD, a plurality of sectors are formed to attain CAV (constant angular velocity) or CLV (constant linear velocity). Here, an error correction code (ECC) block is composed with 16 sectors as a group.
If a last recording (already recorded portion) is terminated halfway of the ECC block(fourth sector) in an example shown in
FIG. 1A
, an invalid predetermined data is recorded after a final end of that ECC block up to a predetermined position in a first sector of a next ECC block. When additional recording is to be carried out, the invalid predetermined data is recorded from the predetermined position in the first sector up to a final end of the first sector and then user data is recorded from a beginning of a second sector.
On the other hand, in an example shown in
FIG. 1B
, if the last data recording (recorded portion) is terminated halfway of the ECC block (fourth sector), an invalid data is recorded after a final end of that ECC block up to a predetermined position of a first sector of a next ECC block, and when the additional recording is to be carried out, the invalid data is recorded from the predetermined position of the first sector up to a final end of the ECC block and then, user data is recorded from a beginning of the next ECC block.
In these conventional linking system, invalid data is written after the recording termination point (fourth sector which is a terminal end of an existing recording portion) of old data and invalid predetermined data is written just after a recording start point (linking start point) of new data. A recording interval of this invalid predetermined data is along enough for absorbing all bad influence of a deviation (for example, wow and flutter) of a rotating phase of the aforementioned spindle motor. Thus, even if there is a gap or overwrite between old and new data, this disadvantage occurs in a range of the invalid predetermined data to such an extent that it can be absorbed, so that destruction of a rear end of the old data can be avoided.
However, because this invalid predetermined data exists in the recording area for recording new data, a recording capacity for new data which can be recorded in this recording area decreases. As a result, as the frequency of the linking increases, the recording capacity of new data decreases. For this reason, there is a problem that although there is a large recording capacity capable of recording a large amount of data, all of this recording capacity cannot be used for recording such a large amount of data.
Further, as other problem relating to the linking, there is a write error which is caused by a loss of focus(de-focus) of laser beam emitted from a pickup at a linking starting point. That is, although upon linking, playback of old data needs a low power for emitting the laser beam, this power needs to be changed to a high power continuously to additionally record new data in succession with this old data. Thus, if the mode changes from the playback mode to the recording mode upon linking as shown in section (A) of
FIG. 2
, the change of focus error occurs as shown in (I) to (III) of section (E) of
FIG. 2
with a change of the laser power, so that a loss of the focus occurs. In other words, the laser beam which is focused accurately when the playback mode is selected become out of focus if the mode is changed to the recording mode. To eliminate this loss of the focus ((II) of section (E) of FIG.
2
), the pickup
2
is lifted up and down (sections (B), (C) and (D) of
FIG. 2
) by the focus servo with respect to a signal surface of the optical disk and after a predetermined time elapses, a focus on the optical disk is obtained ((III) of sections (D) and (E) of FIG.
2
).
A loss of the focus ((II) of section (E) of
FIG. 2
) occurs at a linking start point where the mode needs to be changed from the playback mode to the recording mode so that the focus is not on the optical disk just after additional recording is started (“just after recording is started” shown in section (D) of FIG.
2
). Consequently, a recording pit of a normal size is not formed accurately at a beginning of new data, thereby leading to a cause for an error which may occur when old and new data are played back continuously.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been accomplished in views of the above problems and therefore, an object of the invention is to provide an optical disk recording/playback apparatus in which upon carrying out so-called linking of additionally recording new data subsequent to a recording area in which data is already recorded on an optical disk capable of additionally recording, a recording termination point of existing recording data and a linking start point S for additional recording data are set up in a predetermined area (e.g., CPM area in specific sector S
1
shown in sections (A) to (D) of
FIG. 4
) other than a data area in which new data is recorded and the new data is recorded in an area subsequent to the predetermined area, and an optical disk in which such data is recorded.
Further, another object of the invention is to provide an optical disk recording/playback apparatus in which upon carrying out so-called linking of additionally recording new data subsequent to a recording area in which data is already recorded on an optical disk capable of additionally recording, a recording termination point is
Hasegawa Yuichi
Miyazaki Ken
Osada Yutaka
Berkowitz Marvin C.
Nath Gary M.
Novick Harold L.
Patel Gautam R.
Victor Company of Japan , Limited
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