Recording/playback apparatus capable of carrying out linking on

Recording/playback apparatus capable of carrying out linking on
US006477127B1
(12) United States Patent
(10) Patent N0.:
Osada et al.
(54)
US 6,477,127 B1
(45) Date of Patent:
Nov. 5, 2002
RECORDING/PLAYBACK APPARATUS
CAPABLE OF CARRYING OUT LINKING ()N
OPTICAL DISK, AND OPTICAL DISK
5,634,031 A * 5/1997 Sakuma .................... .. 395/438
6,147,957 A * 11/2000 Nagara et al. ............ .. 369/116
6,195,325 B1 * 2/2001 Okanishi ...... ..
369/124.08
RECORDED WITH LINKED DATA
6,269,069 B1 *
6,335,911 B1 *
(75) Inventors: Yutaka Osada, KanagaWa-ken (JP);
Yuichi Hasegawa, KanagaWa-ken (JP);
Ken Miyazaki, KanagaWa-ken (JP)
7/2001 Ishida et al. .
369/2753
1/2002 Kuroda .................... .. 369/532
OTHER PUBLICATIONS
Y. Tanaka, “Aspherical Molded Glass Lens for Optical Disk
(73) Assignee: Victor Company of Japan, Limited,
Yokohama (JP)
(*)
Notice:
Drive”, in Microoptics News, Group of Microoptics, Japan
Society of Applied Physics Optics Division, vol. 6, No. 3,
Sep. 27, 1988.
Subject to any disclaimer, the term of this
patent is extended or adjusted under 35
* Cited by examiner
U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/484,545
Primary Examiner—W. R. Young
_
Assistant Examiner—Gautam R. Patel
(22) Flled:
Jan‘ 17’ 2000
(30)
Foreign Application Priority Data
Jan. 19, 1999
(74) Attorney, Agent, or Firm—Gary M. Nath; Harold L.
Novlck; Marvm C' Berkowltz
(JP) ......................................... .. 11-011114
(57)
ABSTRACT
(51)
(52)
Int. Cl.7 ............................................ .. GllB 7/0045
US. Cl. .............................. .. 369/5925; 369/4723;
A Video disk recorder has a function for carrying out a
linking On an Optical disk and Contains a predetermined data
369/5926; 369/5925; 369/4728
building-in circuit for supplying a predetermined ?xed data
(58)
Field of Search ............................. .. 369/591, 47.1,
369/4411, 2751, 5925, 5926, 5321, 4723,
4728, 5335
as a Playback data- Upon linking, a linking point is placed
in a CPM area On the optical disk and the ?xed data is
recorded in this CPM area. Upon playback of the CPM area
in Which the linking is carried out, the ?xed data supplied
from the predetermined data building-in circuit is read out as
(56)
References Cited
the playback data.
US. PATENT DOCUMENTS
5,408,478 A
*
4 Claims, 9 Drawing Sheets
4/1995 Ohmori et al. .......... .. 371/37.5
(A) PRE-FORMAT
f
SYNCHRONOUS
SIGNAL
ECC 113 LOCK
in
n
n
n
n
n
‘
n
1 SECTOR
(B) SECTOR
,
so
51
S2
I
$3
I
S4
513 I
____________ __
(C)
ID
I IED I
l
I
S14
I
515
I
S16
I
/ /
CPM
I
USER DATA B
LINKING AREA
l
D
,
( )
FIXED DATA b
FIXED DATA“
RECORDING TERMINATION
\_
POINT E
USER
(DATAAI‘M
ID
IIEDI ‘M5
RECORDING
FIXED DATA c
EXISTING
’
RECORDING PORTION
\
M;
I
USER DATA B
It
LINKING START POINTS
FIXED DATA (1
(E)
\
PLAYBACK Mi?FA I M)
\
PRE-FORMAT
SYNCHRONOUSJH
SIGNAL
ID
I IED I
I
K
_
PLAYBACK
DATA
USER DATA B
Y
PLAYBACK
DATA
-|_
U.S. Patent
Nov. 5,2002
Sheet 9 0f 9
US 6,477,127 B1
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US 6,477,127 B1
1
2
RECORDING/PLAYBACK APPARATUS
after a ?nal end of that ECC block up to a predetermined
position in a ?rst sector of a next ECC block. When
CAPABLE OF CARRYING OUT LINKING ON
OPTICAL DISK, AND OPTICAL DISK
RECORDED WITH LINKED DATA
additional recording is to be carried out, the invalid prede
termined data is recorded from the predetermined position in
the ?rst sector up to a ?nal end of the ?rst sector and then
user data is recorded from a beginning of a second sector.
BACKGROUND OF THE INVENTION
On the other hand, in an example shoWn in FIG. 1B, if the
last data recording (recorded portion) is terminated halfWay
1. Field of the Invention
The present invention relates to a recording/playback
of the ECC block (fourth sector), an invalid data is recorded
after a ?nal end of that ECC block up to a predetermined
position of a ?rst sector of a next ECC block, and When the
apparatus for an optical disk for recording and playing back
data signal on/from the recordable/reproducible optical disk
additional recording is to be carried out, the invalid data is
recorded from the predetermined position of the ?rst sector
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
15
In these conventional linking system, invalid data is
Written after the recording termination point (fourth sector
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
20
is additionally recorded subsequent to an already recorded
neW data is recorded ?nely not so as to produce a Waste data,
thereby using the capacity of the optical disk to a maximum
mentioned spindle motor. Thus, even if there is a gap or
25
HoWever, at a border betWeen old and neW data in a
an extent that it can be absorbed, so that destruction of a rear
end of the old data can be avoided.
linked at a higher accuracy than a rotation accuracy of a
30
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 ?utter) affects the accuracy
badly. Further, in case Where an optical disk containing old
data is recorded With other recording unit, a deviation of the
Further, as other problem relating to the linking, there is
40
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 45
neW data, or a beginning of the neW data is Written over a
an error Which may occur When the old and neW data are
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.
large gap occurs betWeen the recording termination point
and linking start point, or the linking start point is located in
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
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 record
ing area decreases. As a result, as the frequency of the
linking increases, the recording capacity of neW data
35
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
overWrite betWeen old and neW data, this disadvantage
occurs in a range of the invalid predetermined data to such
linking portion on a conventional recordable/reproducible
optical disk described above, old and neW data needs to be
spindle motor for rotating the optical disk (for example, the
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 in?uence of a deviation (for
example, WoW and ?utter) of a rotating phase of the afore
area (“additional recording”, “linking”, “after recording”),
extent.
up to a ?nal end of the ECC block and then, user data is
recorded from a beginning of the next ECC block.
50
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
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
played back continuously.
selected become out of focus if the mode is changed to the
As a method for preventing such an error, a method in
Which the linking is started apart by a predetermined length
recording mode. To eliminate this loss of the focus ((II) of
section
of FIG. 2), the pickup 2 is lifted up and doWn
from a ?nal end of an area in Which the old data is recorded 55
(sections (B), (C) and (D) of FIG. 2) by the focus servo With
has been employed since before. FIGS. 1A, 1B shoW an
example of a conventional linking method as such a pre
respect to a signal surface of the optical disk and after a
predetermined time elapses, a focus on the optical disk is
venting method.
obtained ((III) of sections (D) and
In concentrically or spirally formed tracks of a recordable/
reproducible optical disk such as CD-R, CD-RW and DVD,
60
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
(D) of FIG. 2). Consequently, a recording pit of a normal
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
of FIG. 2).
A loss of the focus ((II) of section
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
65
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.
US 6,477,127 B1
3
4
SUMMARY OF THE INVENTION
area from the played-back information signal, the playback
means reads no information signal from the portion but
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
outputs a second predetermined data assuming that the
second predetermined data is read instead.
In a preferred embodiment of the present invention, the
data generating means sets up cyclically a multiplicity of
recording area in Which data is already recorded on an
predetermined areas in a recordable area in the optical disk.
optical disk capable of additionally recording, a recording
termination point of eXisting recording data and a linking
In a preferred embodiment of the present invention, the
signal recording means records the predetermined data from
start point S for additional recording data are set up in a
a termination point of the eXisting recording area up to the
predetermined area (e.g., CPM area in speci?c sector S1
shoWn in sections (A) to (D) of FIG. 4) other than a data area
linking start point.
in Which neW data is recorded and the neW data is recorded
in an area subsequent to the predetermined area, and an
data generating means sets a speci?c area in each sector of
the recordable area as the predetermined area.
optical disk in Which such data is recorded.
Further, another object of the invention is to provide an
In a preferred embodiment of the present invention, the
15
In a preferred embodiment of the present invention, the
speci?c area is an area located behind an ID area and in front
optical disk recording/playback apparatus in Which upon
carrying out so-called linking of additionally recording neW
of an user data area.
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 detected in a data
disk recording/playback apparatus for recording and playing
back information signal using an optical disk capable of
additionally recording neW information signal subsequent to
To achieve the above object, there is provided an optical
area for recording neW data or even in a predetermined area
eXisting recording area in Which information signal is
other than the data area for recording neW data, and in order
not to produce incontinuity betWeen a reproduction clock
recorded, the optical disk recording/playback apparatus
obtained by playing back eXisting recording data and a
recording clock for use in additionally recording neW data,
a recording clock synchronous-With the playback clock is
25
comprising: a playback clock generating means for gener
ating and outputting a playback clock from information
signal recorded in the eXisting recording area; a recording
clock generating means for generating and outputting a
recording clock based on a reference signal recorded in the
changed to a recording clock generated based on a reference
signal recorded in an optical disk preliminarily so as to
achieve additional recording of neW data.
optical disk; a linking start point generating means for
detecting a recording termination point of information signal
Further, still another object of the invention is to provide
recorded in the existing recording area and changing a
an optical disk recording/playback apparatus for generating
recording clock synchroniZed With the playback clock to the
and holding a compensation signal for eliminating a loss of
recording clock generated based on the reference signal so
a focus of a pickup Which may occur When the playback 35 as not to produce an incontinuity betWeen the playback
state of information signal recorded in the eXisting recording
area is changed to additional recording state for additionally
recording neW information signal, and having a structure for
outputting a compensation signal to a focus error detecting
clock and recording clock at the termination point to gen
erate a linking start point; and a recording signal generating
means for starting output of neW information signal syn
chronous With the recording clock generated based on the
means, thereby preventing inability of recording a beginning
reference signal from the linking start point.
portion of neW data to be additionally recorded in a normal
state, because of a loss of focus Which occurs due to a large
Further, to achieve the above object, there is provided an
optical disk recording/playback apparatus for recording and
playing back information signal using an optical disk
capable of additionally recording information signal subse
de?ection of laser beam poWer caused When the playback
state is changed to the recording state just after a linking
start.
45
quent to a recording area in Which information signal is
To achieve the above object, there is provided an optical
recorded, the optical disk recording/playback apparatus
disk recording/playback apparatus for recording and playing
back information signal using an optical disk capable of
additionally recording neW information signal subsequent to
recorded, the optical disk recording/playback apparatus
comprising: a focus error detecting means for detecting a
focus error of a pickup; a focus control means for controlling
focusing of the pickup so as to eliminate the focus error by
inputting the focus error; and a compensating means for
generating/holding a compensation signal so as to eliminate
comprising: a data generating means for setting a linking
start point for additionally recording in a predetermined area
playback state of information signal recorded in the eXisting
subsequent to the eXisting recording area and generating
recording area is changed to additional recording state for
eXisting recording area in Which information signal is
a loss of focus of the pickup Which is produced When
predetermined data to be recorded in an area from the 55 additionally recording neW information signal and output
linking start point up to a termination point of the predeter
mined area to output the predetermined data; a signal
ting the compensation signal to the focus control means at
the change-over time.
recording means for inputting the predetermined data from
Further, to achieve the above object, there is provided an
the data generating means so as to record the predetermined
optical disk capable of additionally recording information
data from the linking start point up to the termination point
signal subsequent to eXisting recording area in Which infor
mation signal is recorded, Wherein a linking start point for
of the predetermined area and recording the neW information
signal in an area subsequent to the predetermined area; and
a playback means, upon detecting a portion corresponding to
the predetermined area from the played-back information
signal, for reading no information signal from this portion.
In a preferred embodiment of the present invention, upon
detecting the portion corresponding to the predetermined
additional recording is set up in a predetermined area
subsequent to the eXisting recording area, a predetermined
65
data is recorded from the linking start point up to a termi
nation point of the predetermined area, and neW information
signal is recorded in a neW recording area subsequent to the
predetermined area.
US 6,477,127 B1
5
6
In a preferred embodiment of the present invention, a
plurality of predetermined areas are set cyclically.
In a preferred embodiment of the present invention, a
speci?c area in each sector is the predetermined area.
In a preferred embodiment of the present invention, the
data B) subsequent to the predetermined area; and a play
back means in Which if a portion corresponding to the
predetermined area is detected from the played-back infor
mation signal at the time of playback, no information signal
is read from this portion.
Here, the data generating means comprises a linking time
speci?c area is located behind an ID area and in front of an
user data area.
recording signal generation circuit 4 and a linking timing
generation circuit 5. The signal recording means comprises
The nature, principle and utility of the invention Will
become more apparent from the following detailed descrip
tion When read in conjunction With the accompanying draW
recording signal generation circuit 8, and laser driving
a user data supplying circuit 6, ID data generation circuit 7,
10
circuit 9. The playback means comprises a linking area
ings.
determining circuit 11, playback signal demodulation circuit
12, predetermined data building-in circuit 13, error correc
tion circuit 14 and interface circuit 15.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying draWings:
15
FIGS. 1A, 1B are explanatory diagrams for explaining a
linking system of a conventional video disk recorder;
As shoWn in FIGS. 5, 6, the optical disk recording/
playback apparatus of the present invention is an optical disk
recording/playback apparatus (video disk recorder 200) for
recording and playing back information signal using an
optical disk 1 capable of additionally recording neW infor
FIG. 2 is an explanatory diagram of a focus error Which
may occur upon linking in a video disk recorder;
mation signal (user data B) in an area (not-recorded area
shoWn in FIG. 6) subsequent to the existing recording area
(recorded area shoWn in FIG. 6) in Which information signal
FIG. 3 is a block diagram shoWing schematically a video
disk recorder according to a ?rst embodiment of an optical
disk recording/playback apparatus of the present invention;
(user data A) has been already recorded. The optical disk
FIG. 4 is a diagram for explaining a recording/playback
operation of a video disk recorder according to the ?rst
recording/playback apparatus of the present invention is an
25
embodiment of the optical disk recording/playback appara
tus of the present invention;
recorder 200) for recording and playback comprising: a
playback clock generating means for generating and output
ting a playback clock from information signal (user data A)
recorded in the existing recording area; a recording clock
generating means for generating and outputting recording
clock based on a reference signal (Wobble signal) recorded
in the optical disk 1; a linking start point generating means
for detecting a recording termination point E of information
signal (user data A) recorded in the existing recording area
FIG. 5 is a block diagram shoWing schematically a video
disk recorder according to a second embodiment of the
optical disk recording/playback apparatus of the present
invention;
FIG. 6 is a diagram for explaining a recording/playback
operation of a video disk recorder according to the second
embodiment of the optical disk recording/playback appara
tus of the present invention;
FIG. 7 is a block diagram shoWing schematically a video
disk recorder according to a third embodiment of the optical
optical disk recording/playback apparatus (video disk
35
and changing a recording clock (Write clock) synchroniZed
With the playback clock to a recording clock (Write clock)
generated based on the reference signal (Wobble signal) so
as not to produce an incontinuity betWeen the playback
disk recording/playback apparatus of the present invention;
clock and recording clock (Write clock) at this termination
FIG. 8 is a diagram shoWing a relation betWeen a voltage
of focus error signal and a deviation of a pickup; and
point E to generate a linking start point S; and a recording
signal generating means for starting output of neW informa
FIG. 9 is a diagram for explaining a linking operation of
tion signal (user data B) synchronous With a recording clock
(Write clock) generated based on the reference signal
(Wobble signal) from the linking start point S.
a video disk recorder according to the third embodiment of
the optical disk recording/playback apparatus of the present
invention.
45
DESCRIPTION OF THE PREFERRED
EMBODIMENTS
erating means includes a Write clock generating circuit 26.
The linking start point generating means comprises a phase
comparison circuit 23, loW pass ?lter 24, selection sWitch
Hereinafter, the optical disk recording/playback apparatus
28, control circuit 29, counting circuit 30, linked recording
start timing generating circuit 31 and correction operation
and optical disk of the present invention Will be described
With reference to FIGS. 3—9.
circuit 32. The recording signal generating means includes
The optical disk recording/playback apparatus of the
the recording signal generation circuit 8.
present invention is an optical disk recording/playback appa
ratus (video disk recorder 100) for recording and playing
back information signal using an optical disk 1 capable of
The playback clock generating means comprises a play
back clock generating circuit 22. The recording clock gen
55
As shoWn in FIG. 7 to FIG. 9, the optical disk recording/
playback apparatus of the present invention is an optical disk
additionally recording information signal (user data B) sub
recording/playback apparatus (video disk recorder 300) for
sequent to existing recording area in Which information
signal (user data A) is recorded, as shoWn in FIGS. 3, 4. The
optical disk recording/playback apparatus of the present
recording and playing back information signal using an
optical disk 1 capable of additionally recording information
signal (user data B) subsequent to the recording area (a
invention comprises a data generating means for setting a
recorded area just up to the linking start point S shoWn in
linking start point S for additionally recording in a prede
FIG. 9) in Which information signal (user data A) is
recorded. The optical disk recording/playback apparatus of
termined area (CPM area in sector S1) subsequent to the
existing recording area; a signal recording means for record
ing from the linking start point S up to an terminal and of the
predetermined area (CPM area) by inputting the predeter
mined data from the data generating means and recording
neW information signal in an area (user area for storing user
the present invention is an optical disk recording/playback
65
apparatus comprising a focus error detecting means for
detecting a focus error of a pickup 2; a focus control means
for controlling focusing of the pickup so as to eliminate the
focus error by inputting the focus error; and a compensating
US 6,477,127 B1
7
8
means for generating/holding a compensation signal (offset
compensation voltage for compensating for a loss of focus)
6 for supplying user data B to be recorded in the optical disk
1 and an ID data generating circuit 7 for generating ID data
so as to eliminate a loss of focus of the pickup 2 Which is
of each sector as Well as user data B are connected to the
produced When playback state of information signal
recording signal generating circuit 8. The recording signal
recorded in the eXisting recording area is changed to addi
tional recording state for additionally recording neW infor
generating circuit 8 selects either the upon-linking recording
mation signal (linking start point S) and outputting the
compensation signal to the focus control means at the
aforementioned change-over time.
Here, the focus error detecting means includes a focus
error detecting circuit 41. The focus control means com
prises a focus servo circuit 42 and an actuator drive circuit
10
43. The compensation means comprises a selection sWitch
44, offset voltage generating circuit 45 and timing generat
ing circuit 47.
15
signal (?Xed data c after the linking start point S) or a series
of data including ID data, IDE data and user data B,
depending on Whether the linking area (indicated in (C) of
FIG. 4) or other area (ID, IED, user data (indicated in (C) of
FIG. 4) is recorded in each sector and generates such a
recording signal and transmits to the laser driving circuit 9.
A data signal preampli?er 10 for amplifying read data
signal upon playback mode is connected to the pickup 2 and
the data signal ampli?ed here is transmitted to the linking
area determining circuit 11. This linking area determining
1 capable of additionally recording information signal (user
circuit 11 analyZes the read data signal so as to determine
Whether or not the data is played back from the linking area
data B) subsequent to the eXisting recording area in Which
information signal (user data A) is recorded, as shoWn in
(indicated in (C) of FIG. 4). If the data is reproduced from
The optical disk of the present invention is an optical disk
(indicated in (C) of FIG. 4) or other area (ID, IED, user data
other area than the linking area, the linking area determining
circuit 11 transmits data signal to the error correction circuit
FIG. 4, in Which a linking start point S for additional
recording is set up in a predetermined area (CPM area in
sector S1) subsequent to the eXisting recording area, a
predetermined data c is recorded from this linking start point
S up to a terminal end of the predetermined area (CPM area)
and neW information signal (user data B) is recorded in a
recording area (user area for storing user data B)subsequent
25
the error correction circuit 14.
to the predetermined area.
The predetermined data building-in circuit 13 is a circuit
for supplying the ?Xed data d as playback data and if the
linking area determining circuit 11 detects a linking area
The predetermined area (CPM area) mentioned above is
an area Which is located behind the ID area in the speci?c
sector S1 and in front of user data area.
(CPM area), the predetermined data building-in circuit 13
Hereinafter, ?rst embodiment-third embodiment of the
outputs the ?Xed data d to the error correction circuit 14
optical disk recording/playback apparatus of the present
invention Will be described in detail.
First Embodiment
35
instead of the data signal (?xed data b, c, indicated in (D) of
FIG. 4) outputted from the data signal preampli?er 10.
(Operation of the Video Disk Recorder 100)
Next, an operation for linking With the video disk recorder
(Structure of Video Disk Recorder 100)
A?rst embodiment of the optical disk recording/playback
having such a structure Will be described. FIG. 4 is a
diagram for eXplaining a recording/playback operation of
apparatus of the present invention Will be described in detail.
FIG. 3 is a block diagram shoWing schematically a video
disk recorder 100 according to the ?rst embodiment of the
the video disk recorder 100 according to the ?rst embodi
ment of the optical disk recording/playback apparatus of the
present invention.
optical disk recording/playback apparatus of the present
invention.
In the same Figure, the video disk recorder 100 records
and plays back information signal on and from an optical
disk 1 via a pickup 2 and particularly, has a function for
14 and interface circuit 15 via the playback signal demodu
lation circuit 12. On the other hand, if the data is played back
from the linking area, the linking area determining circuit 11
transmits a predetermined ?Xed data d (indicated in
of
FIG. 4) from the predetermined data building-in circuit 13 to
According to this embodiment, a repeating area in Which
the same content data is recorded repeatedly over plural
sectors is provided on the optical disk 1. First, this Will be
45 described. FIG. 4 shoWs a structure of data sector on the
optical disk 1.
As shoWn in sections (A)—(C) of FIG. 4, sectors S1, S2,
additionally recording neW information signal in the back of
an area in Which the information signal is already recorded
(hereinafter referred to as “linking”).
The optical disk 1 is a recording medium such as CD-R,
CD-RW, DVD in Which data signal can be recorded. A
synchronous signal
preformat synchroniZation signal for generating a Write
composed of 16 sectors S1—S16
clock for use in recording is recorded in track of the optical
disk 1.
sectors constitutes a single cycle. Each sector has an ID area
in Which an ID number of each sector is recorded at the head
A preformat synchronous signal detecting circuit 3 for
detecting the aforementioned preformat synchronous signal
55 CPM area provided in each sector and user data area in
S3, S4, . . . Sn are formed synchronously With preformat
of FIG. 4) recorded in track pre
liminarily on the optical disk 1 and an ECC block is
of FIG. 4) While 16
portion thereof, and includes IED area attached to that ID,
is connected to the pickup 2. A linking timing generating
Which user data is recorded
circuit 5 for generating a linking timing based on a read
The CPM area is a reserved area for coping With addi
tional information such as copy protect and future demand.
This CPM area is located behind the ID area of each sector
and in front of user data.
clock generated from the preformat synchronous signal is
connected to this preformat synchronous signal detecting
circuit 3 and a upon-linked(linking time) recording signal
generating circuit 4 for generating a upon-linking(linking
If user data of the same ?le is Written dividedly in plural
sectors, the same content of additional information is Written
in each CPM area of the plural sectors. For eXample, if user
time) recording signal (?Xed data after the linking start point
S described later) is connected to this linking timing gen
eration circuit 5. Then, this upon-linking recording signal is
transmitted to a recording signal generating circuit 8.
This recording signal generating circuit 8 is connected to
the laser driving circuit 9 and a user data supplying circuit
of FIG. 4).
65
data to be Written dividedly in plural sectors is data Which is
permitted to be copied only once according to copy right or
the like, Write inhibit data for inhibiting copy is recorded
repeatedly in the CPM area of each of all the sectors in
US 6,477,127 B1
10
optical disk 1 via the pickup 2 like the aforementioned video
disk recorder 100. Particularly, the video disk recorder 200
Which that user data is Written. According to recording style
of the CPM area, even if a CPM area in Which the same
content data is recorded repeatedly is used for linking, the
has a function for linking neW information signal in the back
of an area in Which information signal is already recorded on
function of copy protect is not affected.
In the video disk recorder 100 of this embodiment, linking
is started Within the CPM area. When recording of preceding
user data A is terminated as shoWn in sections (C), (D) of
the optical disk 1.
In this video disk recorder 200, the pickup 2 plays back
FIG. 4, the recording termination point E is located Within
recording is carried out in a non-recorded area adjacent to
the CPM area. For example, if user data A is terminated in
sector S0 before sector S1, a ?xed data a is recorded from
a ?nal end of the data Aup to a beginning of the next sector
S1. After the ID and IED of the sector S1 are recorded, a
?xed data b is recorded up to halfWay of the CPM area.
After that, When linking for user data B is to be carried
out, the linking start point S is located Within the CPM area
of sector S1 containing the recording termination point E. At
a recorded area at a loW laser poWer and upon linking,
this recorded area continuously With the recorded area at a
10
circuit 25 for detecting a Wobble recorded in a track of the
optical disk 1, a preformat address detecting circuit 27 for
detecting preformat synchronous signal and a land pre-pit
15
this time, a ?xed data C is recorded in the CPM area ahead
of the user data B.
On the other hand, in case Where user data B recorded
circuit 22 generates a playback clock necessary for playback
count Which counts a timing for playback by playing back
data recorded in the recorded area. More speci?cally, play
back clock is calculated from length of pits and interval
betWeen pits for data recorded in the recorded area. Then,
user data A recorded in advance, as shoWn in section
of
FIG. 4, user data A in sector S0, and ID area and IED area
in the sector S1 are played back as usual. Then, the linked
signal recorded here.
25
and counting circuit 30.
The aforementioned Wobble detecting circuit 25 detects a
Waveform of a Wobble recorded preliminarily on the optical
disk 1 so that it is pre-formatted. An output from the Wobble
area is read out as usual, a playback error may occur. Thus,
in the video disk recorder 100 of this embodiment, user data
is played back assuming that the ?xed data d is recorded,
detecting circuit 25 is inputted to the Write clock generating
regardless of Whether data in the CPM area in Which no user
circuit 26. This Write clock generating circuit 26 generates a
data is recorded is effective or destroyed. More speci?cally,
When data signal is read out from the optical disk 1, the ?xed
Write clock necessary for carrying out recording count Which
counts a timing for recording user data outputted from the
user data supplying circuit 6 into the optical disk 1, based on
data d supplied from the predetermined data building-in
circuit 13 is played back by skipping that CPM area or
Wobble signal Waveform supplied from the Wobble detecting
neglecting data b, c read out from the CPM area.
circuit 25 and a correction signal supplied from the correc
Although according to this embodiment, 4) (that is, “0”) is
tion operation circuit 32. The Write clock generated here is
transmitted to the phase comparison circuit 23 and recording
used as each of the aforementioned ?xed data a, b, c, d, other
value than the one is permitted and it is needless to say that
the amount of each data may be set up as required. (Effect
signal generating circuit 8.
The phase comparison circuit 23 detects a phase deviation
of the Video Disk Recorder 100)
In the video disk recorder 100 of this embodiment, the
by comparing the phase of playback clock With the phase of
the Write clock and a value of the phase difference is
transmitted to a terminal of the selection sWitch SW28 via
?xed data b, c are recorded in the CPM area and When the
CPM area is played back, the ?xed data b, c played back
from the optical disk 1 are not used as the playback data, but
the ?xed data d is used. Thus, even if the ?xed data b, c in
a linking area is destroyed upon linking, a read error in the
the loW pass ?lter (LPF) 24. This selection sWitch SW28
inputs a timing signal for starting a linking outputted from
the linked recording start timing generating circuit 31 as a
selection control signal and carries out connection or cutting
of an output from the phase comparison circuit 23 to the
linking area can be avoided, so that the linked data can be
alWays played back excellently from a beginning of that
data.
Because according to this embodiment, the CPM area is
used as the linking area, no user data area is Wasted, so that
a problem that the effective recording capacity is reduced by
the linking can be solved. Because the CPM area is an area
55
in Which the same content data is recorded repeatedly over
plural sectors, even if one of them is used, a function thereof
is not affected.
correction operation circuit 32. The pre-format address
detecting circuit 27 reads out a pre-format synchronous
signal and land pre-pit of the optical disk 1, and controls an
operation of the CPU 29 and counting circuit 30 by detecting
the pre-format synchronous signal. The CPU 29 controls
entirely the video disk recorder 200.
The correction operation circuit 32 outputs a correction
signal to the Write clock generating circuit 26 so that a Write
clock generated from the Wobble signal outputted from the
Wobble detecting circuit 25 is outputted synchronously With
the playback clock in the Write clock generating circuit 26,
Second Embodiment
(Structure of Video Disk Recorder 200)
based on a phase difference signal supplied from the LPF 24
Next, a second embodiment of the present invention Will
be described in detail. FIG. 5 is a block diagram shoWing
schematically a video disk recorder 200 according to the
Referring to the same Figure, the video disk recorder 200
records and plays back information signal on and from the
playback clock generated in the playback clock generating
circuit 22 are transmitted to the phase comparison circuit 23
In other Words, because data may be destroyed due to a
gap, overWrite or the like in the linking area, if that linking
second embodiment of the optical disk recording/playback
apparatus of the present invention.
recorded in the optical disk 1 in advance and a laser driving
circuit 9 for controlling an operation of the pickup 2 are
connected to the pickup 2.
A playback clock generation circuit 22 is connected to a
data signal preampli?er 21. The playback clock generating
additionally in this Way is played back in succession With the
CPM area is played back assuming that the predetermined
data d is alWays recorded regardless of the content of data
high laser poWer.
Then, a data signal preampli?er 21 for amplifying data
signal read out from the optical disk 1, a Wobble detecting
via the selection sWitch SW28. More speci?cally, by adding
65
or subtracting a phase difference betWeen the playback clock
and Write clock to and from the phase of a Write clock
generated from the Wobble signal, it makes the phase of a
Write clock outputted from the Write clock generating circuit
26 coincide With the phase of the playback clock.
US 6,477,127 B1
11
12
On the other hand, the aforementioned counting circuit 30
betWeen the LPF 24 and correction operation circuit 32.
With this condition, the counting circuit 30 is turned OFF
detects an address on the optical disk 1 based on the output
of the pre-format address detecting circuit 27 or playback
clock generating circuit 22 and upon linking, counts for
((A), (D), (G) in FIG. 6).
detecting a linking area located a border betWeen the
recorded area and non-recording area. A result of detection
point E is passed, a supply of the phase difference value from
At the same time When the last recording termination
the LPF 24 is cut out. As a result, only the Wobble signal is
inputted from the Wobble detecting circuit 25 to the Write
clock generating circuit 26 and the Write clock is generated
based on only this signal ((A)—(C) in FIG. 6). AWrite clock
on this counting circuit 30 is outputted to the linked record
ing start timing generating circuit 31. This linked recording
start timing generating circuit 31 computes a timing for
starting the linking and outputs a result of this computation
to the recording signal generating circuit 8 and at the same
generated based on a signal from the Wobble is transmitted
10
time, to the selection sWitch SW28 as a selection control
signal.
The recording signal generating circuit 8 generates a
At an instant of this linking, a non-synchronous signal is
inputted into the Write clock generating circuit 26 at the
recording signal based on an output from the Write clock
generating circuit 26 and respective outputs of the linked
recording start timing generating circuit 31, user data sup
15
same time When the linking area S is passed. The Write clock
generating circuit 26 reacts With a change of signal mildly.
plying circuit 6, and ID data generating circuit (not shoWn)
As a result, the clock changes gradually from a Write clock
synchronous With the playback clock to a Write clock
generated based on the Wobble. Because this change of the
and transmits it to the laser driving circuit 9. The laser
driving circuit 9 records information signal on the optical
disk 1 by means of the pickup 2 based on a recording signal
clock can be carried out so that both the clocks are
generated from the recording signal generating circuit 8.
(Operation of Video Disk Recorder 200)
continuous, an occurrence of data reading error in the
linking area can be prevented.
Next, an operation of linking With the video disk recorder
(Effect of Video Disk Recorder 200)
200 having such a structure Will be described. FIG. 6 is a
diagram for explaining a recording/playback operation of
the video disk recorder 200 according to the second embodi
ment of the optical disk recording/playback apparatus of the
present invention. According to this embodiment, different
from the video disk recorder 100 according to the ?rst
embodiment, the linking does not have to be carried out only
in a predetermined linking area. When the linking is carried
to the recording signal generating circuit 8 and then, the
recording signal generating circuit 8 generates a recording
signal corresponding to this Write signal.
25
In the video disk recorder 200 of this embodiment, in the
linking area, the clock changes mildly from a Write clock
synchronous With the playback clock to a Write clock
generated based on the Wobble preliminarily recorded on the
optical disk 1, so as to avoid incontinuity of recording in the
linking area. As a result, it is possible to prevent an occur
rence of an error in the linking area.
Third Embodiment
out, ?rst, a recorded area is played back. Then, at the same
time When a last recording termination point is exceeded,
(Structure of Video Disk Recorder 300)
neW data can be recorded in a non-recorded area.
Hereinafter, a third embodiment of the optical disk
recording/playback apparatus of the present invention Will
As shoWn in sections (A)—(C) of FIG. 6, in the recorded
area A, generation of the playback clock and generation of
35
Write clock are carried out. More speci?cally, a playback
clock(indicated in (B) of FIG. 6) is generated from data
signal by the playback clock generating circuit 22 and the
Write clock generating circuit 26 generates a Write clock
(indicated in (C) of FIG. 6) from the Wobble signal. In this
While, linking is kept OFF. Further, the sWitch SW28 is ON
(indicated by (D) in FIG. 6) so that the LPF 24 is connected
to the correction operation circuit 32. The phase comparison
and plays back information signal on the optical disk 1 by
circuit 23 detects a phase difference betWeen a playback
clock and a Write clock and transmits it to the correction
operation circuit 32 via the sWitch SW28. The correction
operation circuit 32 transmits a correction signal to the clock
generating circuit 26 so as to synchroniZe the playback clock
With the Write clock based on the phase difference value.
During a playback of the recorded area A, a playback
clock from the playback clock generating circuit 22 is
transmitted to the counting circuit 30. This counting circuit
30 is turned ON When a pre-format synchronous signal
supplied from the pre-format address detecting circuit 27 is
inputted
in FIG. 6) so that counting of a playback clock
is started
in FIG. 6). Based on counting by the counting
circuit 30, the linked recording start timing generating
be described. FIG. 7 is a block diagram shoWing schemati
cally a video disk recorder 300 according to a third embodi
ment of the optical disk recording/playback apparatus of the
present invention. The third embodiment of the present
invention Will be described in detail.
As shoWn in FIG. 7, the video disk recorder 300 records
45
means of the pickup 2.
In the same Figure, a focus error detecting circuit 41 and
an address detecting circuit 46 for detecting an address
pre-formatted on a track of the optical disk 1 are connected
to the pickup 2. The focus error detecting circuit 41 detects
a focus error of laser beam of the pickup 2 and the detected
focus error is transmitted to a focus servo circuit 42 via an
adding circuit 48. The focus servo circuit 42 drives the
actuator drive circuit 43 according to the focus error. The
actuator drive circuit 43 drives the actuator (not shoWn) so
as to lift up/doWn an objective lens of the pickup 2 With
respect to a signal face of the optical disk 1 to eliminate the
focus error.
On the other hand, the address detecting circuit 46 outputs
55
circuit 31 detects a last recording termination point E and
counts a timing of linking start.
If a reading position of the pickup 2 reaches the linked
a detected address to the timing generating circuit 47. The
timing generating circuit 47 counts a timing for changing
over the selection sWitch SW44 based on an address
detected by the address detecting circuit 46. This selection
sWitch SW44 connects an offset voltage generating circuit
recording start point S, linking is started
in FIG. 6).
Then, the linked recording start timing generating circuit 31
45 to an adding circuit 48 based on a control signal from the
timing generating circuit 47.
The offset voltage generating circuit 45 generates and
instructs to start recording of user data B to the recording
signal generating circuit 8 and correspondingly, the laser
holds an offset compensation voltage of a predetermined
driving circuit 9 increases laser poWer for recording so as to
value to eliminate a loss of focus due to a change of the Wave
start recording
in FIG. 6).
On the other hand, When the linked recording start point
is passed, the linked recording start timing generating circuit
31 turns OFF the sWitch SW28 so as to cut off a connection
65
length of laser caused upon change from playback to record
ing. That is, in order to immediately eliminate a loss of the
focus of laser beam caused When a changeover from play
back to recording just at the timing of passing of the linking
US 6,477,127 B1
13
14
start point, this offset compensation voltage is applied to the
linked portion can be prevented so as to prevent an error
focus servo circuit 42. Consequently, the actuator drive
circuit 43 is made to carry out focus adjustment preliminar
ily so as to make the focus point of laser beam a focus point
upon recording, before linking start, so that it comes that
When the linking is started, a loss of the focus is already
corrected.
The offset compensation voltage is a voltage to be applied
to focus laser beam Which is focused under a playback
upon playback, thereby making it possible to record data
?nely. Consequently, the capacity of the optical disk can be
poWer even When the laser poWer is used at a recording
poWer larger than the playback poWer.
used effectively to a maximum extent.
Further, according to the optical disk recording/playback
apparatus of the present invention, When the linking is
carried out in such a recording type optical disk, it is possible
to prevent an occurrence of an error due to a loss of focus
upon linking thereby securing recording of data.
10
FIG. 8 is a diagram shoWing a relation betWeen voltage
and a deviation of the pickup When the focus error signal is
skilled in the art and it is intended to encompass such
obvious modi?cations and changes in the scope of the
applied. In the same ?gure, although a focus point shoWn by
the focus error signal
under the playback poWer is O1,
it moved to O2 in case of the recording poWer. Therefore, it
is necessary to match the focus point O1 With O2 before the
It should be understood that many modi?cations and
adaptations of the invention Will become apparent to those
claims appended hereto.
15
What is claimed is:
mined voltage v is applied to the focus error signal and then
1. An optical disk recording/playback apparatus for
recording and playing back information signal using an
optical disk capable of additionally recording neW informa
tion signal subsequent to existing recording area in Which
information signal is recorded, said optical disk having
the FE under the playback poWer is raised so as to match a
successive ECC blocks thereon each composed of a plurality
point O3 on the FE under the playback poWer With O2.
of sectors each including an ID area in Which an ID number
is recorded, a user data area in Which a user data is recorded,
and a CPM area, located after the ID area and before the user
playback poWer changes to the recording poWer. According
to the offset compensation voltage of this embodiment, to
eliminate the offset voltage shoWn in the ?gure, a predeter
(Operation of Video Disk Recorder 300)
Next, a linking operation of the video disk recorder 300
having such a structure Will be described. FIG. 9 is a 25 data area, in Which copy protect information is recorded,
diagram for explaining the linking operation of the video
said optical disk recording/playback apparatus comprising:
disk recorder 300 according to the third embodiment of the
a recording means for recording an information signal on
optical disk recording/playback apparatus of the present
said optical disk;
invention.
First, an address and a focus error are detected in a
a supplying means for supplying said recording means
recorded area under the playback mode
in FIG. 9). In
this While, a linking start point S is detected by the address
With ?rst and second user data to be recorded on the
user data area of said optical disk as said information
signal; and
detecting circuit 46 so as to measure a timing for the linking
start by the timing generating circuit 47.
Next, just before a position of the pickup 2 approaches the
linking start point S, the timing generating circuit 47 turns
35
ON the selection sWitch 44 (indicated in (B) of FIG. 9) so
as to supply an offset compensation voltage from the offset
voltage generating circuit 45 to the adding circuit 48. With
addition of this offset compensation voltage, the Wave length
of laser beam projected by the pickup 2 changes, so that to
an area thereof in Which an end of the ?rst user data
is recorded and in an area from a head to midWay of
the CPM area in a next sector located after the user
actuator drive circuit 43 de?ect a position of the objective
data area in Which the end of the ?rst user data is
lens of the pickup 2 (indicated in (C) and (D) of FIG. 9).
When the linking start point S is passed, the playback
generating circuit 47 turns OFF the selection sWitch 44 so as
With the ?rst data, Wherein
said recording means, after terminating a recording of
the ?rst user data, records the ?rst data generated by
said generating means in the user data area excluding
eliminate a loss of the focus, the focus servo circuit 42 and
mode is changed to the recording mode and the timing
a ?rst generating means for generating a ?rst data different
from the user data and supplying said recording means
recorded, and said recording means, upon recording
45
the second user data, records the ?rst data generated
by said generating means in the CPM area excluding
to cut off a supply of the offset compensation voltage
an area thereof in Which the ?rst data has been
(indicated in (A) and (B) of FIG. 9). If the playback mode
already recorded, and records the second user data
is changed to the recording mode, the Wave length of laser
from a next user data area located after the CPM
area, thereby to use the CPM area as a linking area.
beam is changed. Although With this, the focus point begins
to move, because the loss of the focus has been already
eliminated by the offset compensation voltage, this loss of
the focus does not occur at the linking start point S and
further the objective lens does not move (indicated in (C)
and (D) of FIG. 9).
(Effect of Video Disk Recorder 300)
Because the video disk recorder 300 of this embodiment
prevents a loss of the focus at the linking start point S, the
loss of the focus just after a linking start can be eliminated
and an accurate pit can be formed on a track just after
recording is started, thereby securing data reliability.
According to the optical disk recording/playback appara
2. An optical disk recording/playback apparatus according
to claim 1, further comprising:
a playback means for playing back the ?rst and second
user data recorded on said optical disk;
a second generating means for generating a second data
different from the user data; and
an output means for outputting the second data generated
by said second generating means instead of the ?rst
data recorded on the linking area.
3. An optical disk recording/playback apparatus according
tus of the present invention, as described above, When
to claim 2, Wherein the ?rst data and the second data are
?xed data.
additionally recording neW data just after an already
recorded area, that is, carrying out so-called linking in a
to claim 3, Wherein the second data is 0.
4. An optical disk recording/playback apparatus according
recordable/reproducible type optical disk such as DVD-R,
an occurrence of a non-recording gap or an overWrite in a
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