Optical disk having an evaluation pattern for evaluating the optical disk

• US 5,892,751 A
• Filed: 04/10/1997
• Issued: 04/06/1999
• Est. Priority Date: 04/14/1995
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Corporation
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Satoh, Hiroharu, Fujimoto, Sadanari
• Primary Examiner(s): Neyzari, Ali
• Application Number:
  US08/843,647
• Time in Patent Office: 726 Days
• Field of Search: 369/275.4, 369/275.3, 369/275.1, 369/275.2, 369/58, 369/59, 369/13, 369/54, 369/48, 369/44.32, 369/44.26, 369/44.29, 369/44.34, 369/116, 369/274, 369/276 , 369/273, 369/124
• US Class Current: 369/59.25
• CPC Class Codes: G11B 20/1426 conversion to or from block codes or representations thereof
• CPC Class Codes: G11B 20/182 using test patterns
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• CPC Class Codes: G11B 7/00375 arrangements for detection of physical defects, e.g. of recording layer
• CPC Class Codes: G11B 7/0045 Recording G11B7/006, G11B7/0065 take precedence
• CPC Class Codes: G11B 7/005 Reproducing G11B7/0065 takes precedence
• CPC Class Codes: G11B 7/007 Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• CPC Class Codes: G11B 7/24085 Pits

Abstract

Pits and lands which have a pit length of 3T, a land length of *6T, a pit length of 7T, a land length of *3T, a pit length of 6T and a land length of *7T are alternately formed in a lead-in area in an inner track area on an optical disk as a test pattern for evaluating a read error of the optical disk. This test pattern data is reproduced by a reproducing system to detect an error rate, a compensation coefficient for minimizing the error rate is acquired, and a reproduction signal is compensated by using this compensation coefficient so that the reproduction signal is reproduced with the minimized error rate by the reproducing system.

Claims

1. An optical disk comprising:

a lead-in area defined in an inner peripheral region of the optical disk;

a lead-out area defined in an outer peripheral region of the optical disk, and

a data area which is defined between said lead-in area and said lead-out area, and on which data is recorded as pits and lands on said optical-disk, said pits having one of a shortest pit length (3T), a longest pit length (KT) and a pit length between said shortest pit length (3T) and said longest pit length (KT), where T is a channel pit length, 8<

m<

n<

k and m, n and k are integers, said lands having one of a shortest non-pit (*3T), a longest non-pit length (*KT) and a non-pit length between said shortest non-pit length (*(3T) and said longest non-pit length (*KT);

wherein said lead-in area includes a test pattern area composed of at least one physical sector having a header in which a physical sector address is described and a data section in which a test pattern having a pattern of said pits and land is recorded, said test pattern having a repetition of predetermined arrangements of said pits and lands in succession, each arrangement comprising;

a first pit with a pit length of one 3T, mT, and nT;

a first land with a land length of one of 3T, mT, and nT;

a second pit with a pit length of remaining one of 3T, mT, and nT, not used to define said length of said first pit;

a second land with a land length of a remaining one of 3T, mT, and nT, not used to define said length of said first land;

a third pit with a pit length of a last remaining one of 3T, mT, and nT not used to define said length of said first and said second pit; and

a third land with a land length of a last remaining one of 3T, mT, and nT not used to define said first and said second land.

2. The optical disk according to claim 1, wherein m and n are both greater than or equal to 6 and m is less than or equal to n.

3. The optical disk according to claim 1, wherein said pits has a pit length of 3T, said first land has a pit length of 3T, said first land has a land length of *6T, said second pit has a pit length of 7T, said second land has land length of *3T, said third pit has a pit length of 6T, and said third land has a land length of *7T.

4. The optical disk according to claim 1, wherein a pattern of pits with pit length 3T, lands with a land length of *6T and pits with a pit length of 7T is equivalent to a code word 0010000010000001.

5. The optical disk according to claim 1, wherein m=6 and n=7 and said lengths of said first pit, said second land, said third pit and said third land, respectively, in said arrangement of said pits and lands is selected from a group consisting of 3T-*6T-7T*3T-6T-*7T, 3T-*7T-6T-*3T-6T-*7T, 6T-*3T-7T-*6T-3T-*7T, 7T-*3T-6T-*7T-3T-*6T, 6T-*7T-3T-*6T-7T-*3T, and 7T-*6T-3T-*7T-6T-*3T.

6. An optical retrieving apparatus comprising:

reading means for optically reading a test pattern and data stored in the optical disk as reproducing signals from the optical disk, said optical disk including;

a lead-in area defined in an inner peripheral region of the optical disk;

a lead-out area defined in an outer peripheral region of the optical disk; and

a data area which is defined between said lead-in area and said lead-out area, and on which data is recorded as pits and lands on said optical disk, said pits having one of a shortest pit length (3T), a longest pit length (KT) and a pit length between said shortest pit length (3T) and said longest pit length (KT), where T is a channel pit length, 3<

m<

n<

k and m, n and k are integers, said lands having one of a shortest non-pit length (*3T), a longest non-pit length (*KT) and a non-pit length between said shortest non-pit length (*3T) and said longest non-pit length (*KT);

wherein said lead-in area includes a test pattern area composed of at least one physical sector having a header in which a physical sector address is described and a data section in which the test pattern having a pattern of said pits and land is recorded, said test pattern having a repetition of predetermined arrangements of said pits and lands in succession, each arrangement comprising;

a first pit with a pit length of one of 3T, mT, and nT;

a first land with a land length of one of 3T, mT, and nT;

a second pit with a pit length of remaining one of 3T, mT, and nT, not used to define said length of said first pit;

a second land with a land length of a remaining one of 3T, mT, and nT, not used to define said length of said first land;

a third pit with a pit length of a last remaining one of 3T, mT, and nT not used to define said length of said first and said second pit; and

a third land with a land length of a last remaining one of 3T, mT, and nT not used to define said first and said second land.

7. The optical retrieving apparatus according to claim 6, wherein m and n are both greater than or equal to 6 and m is less than or greater to n.

8. The optical retrieving apparatus according to claim 6, wherein said pits has a pit length of 3T, said first land has a pit length of 3T, said first land has a land length of *6T said second pit has a pit length of 7T, said second land has land length of *3T, said third pit has a pit length of 6T, and said third land has a land length of *7T.

9. The optical retrieving apparatus according to claim 6, wherein a pattern of pits with pit length 3T, lands with a land length of *6T and pits with length of 7T is equivalent to a code word 0010000010000001.

10. The optical retrieving apparatus according to claim 6, wherein m=6 and n=7 and said lengths of said first pit, said second land, said third pit and said third land, respectively, in said arrangement of said pits and lands is selected from a group consisting of 3T-*6T-7T-*3T-6T-*7T, 3T-*7T-6T-*3T-6T-*7T, 6T-*3T-7T-*6T-3T-*7T, 7T-*3T-6T-*7T-3T-*6T, 6T-*7T-3T-*6T-7T-*3T and 7T-*6T-3T-*7T-6T-*3T.

12. The optical disk playing method according to claim 10, wherein m and n are both greater than or equal to 6 and in is less than or equal to n.

11. An optical disk playing method comprising the steps of:

providing an optical disk comprising;

a lead-in area defined in an inner peripheral region of the, optical disk;

a lead-out area defined in an outer peripheral region of the optical disk; and

a data area which is defined between said lead-in area and said lead-out area, and on which data is recorded as pits and lands on said optical disk, said pits having one of a shortest pit length (3T), a longest pit length (KT) and a pit length between said shortest pit length (3T) and said longest pit length (KT), where T is a channel pit length, 3<

m<

n<

k and m, n and k are integers, said lands having one of a shortest non-pit length (*3T), a longest non-pit length (*KT) and a non-pit length between said shortest non-pit length (*3T) and said longest non-pit length (*KT);

wherein said lead-in area includes a test pattern area composed of at least one physical sector having a header in which a physical sector address is described and a data section in which a test pattern having a pattern of said pits and land is recorded, said test pattern having a repetition of predetermined arrangements of said pits and lands in succession, each arrangement comprising;

a first pit with a pit length of one of 3T, mT, and nT;

a first land with a land length of one of 3T, mT, and nT;

a second pit with a pit length of remaining one of 3T, mT and nT, nor used to define said length of said first pit;

a second land with a land length of a remaining one of 3T, mT, and nT, not used to define said length of said first land;

a third pit with a pit length of a last remaining one of 3T, mT, and nT not used to define said length of said first and said second pit;

a third land with a land length of a last remaining one of 3T, mT, and nT not used to define said first and said second land; and

optically reading the test pattern and the data as reproduction signals from the optical disk.

13. The optical disk playing method according to claim 11, wherein said pits has a pit length of 3T, said first land has a pit length of 3T, said first land has a land length of *6T, said second pit has a pit length of 7T, said second land has land length of *3T, said third pit has a pit length of 6T, and said third land has a land length of 7T.

14. The optical disk playing method according to claim 11, wherein a pattern of pits with pit length 3T, lands with a land length of *6T and pits with a pit length of 7T is equivalent to a code word 0010000010000001.

15. The optical disk playing method according to claim 11, wherein m=6 and n=7 and said lengths of said first pit said second land, said third pit and said third land, respectively, in said arrangement of said pits and lands is selected from a group consisting of 3T-*6T-7T-*3T-6T-*7T, 3T-*7T-6T-*3T-6T-*7T, 6T-*3T-7T-*6T-3T-*7T, 7T-*3T-6T-*7T-3T-*6T, 6T-*7T-3T-*6T-7T-*3T, and 7T-*6T-3T-*7T-6T-*3T.

16. A recording method of recording data on an optical disk having a lead-in area, a lead-out area, and a data area defined between the lead-in area and the lead-out area, comprising:

converting data to be recorded in the data area of the optical disk to a pattern of pits and lands, the pits having one of a shortest pit length (3T), a longest pit length (KT) and a pit length between said shortest pit length (3T) and said longest pit length (KT), where T is a channel pit length, 3<

m<

n<

k and m, n and k are integers, said lands having one of a shortest non-pit length (*3T), a longest non-pit length (KT) and a non-pit length between said shortest non-pit length (*3T) and said longest non-pit length (*KT);

preparing a physical sector address to be recorded in a sector header of a physical sector and a test signal equivalent to a test pattern to be recorded in a sector data section, said test pattern having a repetition of predetermined arrangements of said pits and lands of succession, each arrangement comprising;

a first pit with a pit length of one of 3T, mT, and nT;

a first land with a land length of one of 3T, mT, and nT;

a second pit with a pit length of remaining one of 3T, mT, and nT, not used to define said length of said first pit;

a second land with a land length of a remaining one of 3T, mT, and nT, not used to define said length of said first land;

a third pit with a pit length of a last remaining one of 3T, mT, and nT not used to define said length of said first and said second pit; and

a third land with a land length of a last remaining one of 3T, mT, and nT not used to define said first aid said second land; and

recording the data in the data area on the optical disk, defining at least one physical sector as a test pattern area in the lead-in area on the optical disk, and recording the physical sector address in the header of the physical sector and the test pattern in the second data section.

17. The recording method according to claim 16, wherein m and n are both greater than or equal to 6 and m is less than or equal to n.

18. The recording method according to claim 16, wherein said pits has a pit length of 3T, said first land has a pit length of 3T, said first land has a land length of *6T, said second pit has a pit length of 7T, said second land has land length of *3T, said third pit has a pit length of 6T, and said third land has a land length of *7T.

19. The recording method according to claim 16, wherein a pattern of pits with pit length 3T, lands with a land length of *6T and pits with a pit length of 7T is equivalent to a code word 0010000010000001.

20. The recording method according to claim 16, wherein m=6 and n=7 and said lengths of said first pit, said second land, said third pit and said third land, respectively, in said arrangement of said pits and lands is selected from a group consisting of 3T-*6T-7T-*3T-6T-*7T, 3T-*7T-6T-*3T-6T-*7T, 6T-*3T-7T-*6T-3T-*7T, 7T-*3T-6T*7T-3T-*6T, 6T-*7T-3T-*6T-7T-*3T, and 7T-*6T-3T-*7T-6T-*3T.

21. A recording apparatus for recording data on an optical disk having a lead-in area, a lead-out area, and a data area defined between the lead-in area and the lead-out area, comprising:

a data converting means for converting data to be recorded in the data area of the optical disk to a pattern of pits and land, the pits having one of a shortest pit length (3T), a longest pit length (KT) and a pit length between said shortest pit length (3T) and said longest pit length (KT), wherein T is a channel pit length, 3<

m<

n<

k and m, n, and k are integers, said lands having one of a shortest non-pit length (*3T), a longest non-pit length (*KT) and a non-pit length between said shortest non-pit length (*3T) and said longest non-pit length (*KT);

preparing means for preparing a physical sector address to be recorded in a sector header of a physical sector and a test signal equivalent to a test pattern to be recorded in a sector data section, said test pattern having a repetition of predetermined arrangements of said pits and lands in succession, each arrangement comprising;

a first pit with a pit length of one of 3T, mT, and nT;

a first land with a land length of one 3T, mT, and nT;

a second pit with a pit length of remaining one of 3T, mT, and nT, not used to define said length of said first pit;

a second land with a land length of a remaining one of 3T, mT, and nT, not used to define said length of said first land;

a third pit with a pit length of a last remaining one of 3T, mT, and nT not used to define said length of said first and said second pit; and

a third land with a land length of a last remaining one of 3T, mT, and nT not used to define said first and said second land;

recording means for recording the data in the data area on the optical disk, defining at least one physical sector as a test pattern area in the lead-in area on the optical disk, and recording the physical sector address in the header of the physical sector and the test pattern in the sector data section.

22. The recording apparatus according to claim 21, wherein m and n are greater than or equal to 6 and m is less than or equal to n.

23. The recording apparatus according to claim 21, wherein said pits has a pit length of 3T, said first land has a pit length of 3T, said first land has a land length of *6T, said second pit has a pit length of 7T, said second land has land length of *3T, said third pit has a pit length of 6T, and said third land has a land length of *7T.

24. The recording apparatus according to claim 21, wherein a pattern of length 3T, lands with a land length of *6T and pits with a pit length of 7T is a code word 0010000010000001.

25. The recording apparatus according to claim 21, wherein m=6 and n=7 and said lengths of said-first pit said second land, said third pit and said third land, respectivley, in said arrangement of said pits and lands is selected from a group consisting of 3T-*6T-7T-*3T-6T-*7T, 3T-*7T-6T-*3T-6T-*7T, 6T-*3T-7T-*6T-3T-*7T, 7T-*3T-6T-*7T-3T-*6T, 6T-*7T-3T-*6T-7T-*3T, and 7T-*6T-3T-*7T-6T-*3T.