Optical recording medium as well as method and device for recording and reading same

1. An optical recording medium involving a guide groove wherein the guide groove is allowed to meander over substantially the whole length thereof to form wobble, and wobbled intermittent sections where there is no meandrous area are placed at predetermined positions in said wobble, comprising:

a first wobbled intermittent section for determining reference position being disposed at at least one reference position in said optical recording medium; and

a second wobbled intermittent section being disposed selectively at each predetermined position apart from each reference position by a predetermined distance.

2. An optical recording medium as claimed in claim 1 , wherein:

said first or second wobbled intermittent section has a length corresponding to natural number-fold of a half cycle of the part other than said wobbled intermittent section in said wobble.

3. A method for recording and reading signals with respect to an optical recording medium claimed in claim 1 , comprising the steps of:

detecting a first wobbled intermittent section for determining reference position placed at at least one reference position in said optical recording medium from push-pull signals detected from wobble;

thereafter, detecting a wobbled intermittent section or wobbled intermittent sections other than said first wobbled intermittent section each of which is selectively disposed at a predetermined position apart from said reference position by a predetermined distance; and

utilizing information which has been recorded in said wobbled intermittent section or sections other than said first wobbled intermittent section to record or read said signals with respect to said optical recording medium.

4. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 3 , wherein:

the signals represented by said wobbled intermittent sections are detected by means of two comparators in each of which the upper limit is compared with the lower limit with respect to said push-pull signals as well as of reference signals in synchronization with wobble signals.

5. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 3 , wherein:

one of said two comparators detects a first level or higher levels of said push-pull signals, the other comparator detects a second level or lower levels of said push-pull signals, and the detection signals obtained from these comparators are compared with said reference signals, whereby signals from the wobbled intermittent sections are detected.

6. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 4 , wherein:

one of said two comparators detects a first level or higher levels of said push-pull signals, the other comparator detects a second level or lower levels of said push-pull signals, and the detection signals obtained from these comparators are compared with said reference signals, whereby signals from the wobbled intermittent sections are detected.

7. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 4 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

8. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 5 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

9. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 6 wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

10. A device for recording and reading signals with respect to an optical recording medium claimed in claim 1 , comprising:

a first wobbled intermittent section for determining reference position placed at at least one reference position in said optical recording medium from push-pull signals detected from wobble;

a wobbled intermittent section detecting section for detecting a wobbled intermittent section or wobbled intermittent sections other than said first wobbled intermittent section each of which is selectively disposed at a predetermined position apart from said reference position by a predetermined distance; and

a control section for taking out information, which has been recorded in said wobbled intermittent section or sections other than said first wobbled intermittent section, based on detection signals from said wobbled intermittent section detecting section and utilizing said information thereby to record or read signals with respect to said optical recording medium.

11. An optical recording medium involving a guide groove wherein the guide groove is allowed to meander over substantially the whole length thereof to form wobble, and wobbled intermittent sections where there is no meandrous area are placed at predetermined positions in said wobble, comprising:

a first wobbled intermittent section for determining reference position being disposed at at least one reference position in said optical recording medium; and

second and third wobbled intermittent sections, each being disposed selectively at at least one predetermined position apart from each reference position by a predetermined distance, said second and third wobbled intermittent sections differing from one another.

12. An optical recording medium as claimed in claim 11 , wherein:

said first, second or third wobbled intermittent section has a length corresponding to natural number-fold of a half cycle of the part other than said wobbled intermittent section in said wobble.

13. A method for recording and reading signals with respect to an optical recording medium claimed in claims 11 , comprising the steps of:

detecting a first wobbled intermittent section for determining reference position placed at at least one reference position in said optical recording medium from push-pull signals detected from wobble;

thereafter, detecting a wobbled intermittent section or wobbled intermittent sections other than said first wobbled intermittent section each of which is selectively disposed at a predetermined position apart from said reference position by a predetermined distance; and

utilizing information which has been recorded in said wobbled intermittent section or sections other than said first wobbled intermittent section to record or read said signals with respect to said optical recording medium.

14. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 13 , wherein:

the signals represented by said wobbled intermittent sections are detected by means of two comparators in each of which the upper limit is compared with the lower limit with respect to said push-pull signals as well as of reference signals in synchronization with wobble signals.

15. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 13 , wherein:

one of said two comparators detects a first level or higher levels of said push-pull signals, the other comparator detects a second level or lower levels of said push-pull signals, and the detection signals obtained from these comparators are compared with said reference signals, whereby signals from the wobbled intermittent sections are detected.

16. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 14 , wherein:

one of said two comparators detects a first level or higher levels of said push-pull signals, the other comparator detects a second level or lower levels of said push-pull signals, and the detection signals obtained from these comparators are compared with said reference signals, whereby signals from the wobbled intermittent sections are detected.

17. A method of recording and reading signals with respect to an optical recording medium as claimed in claim 14 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

18. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 15 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

19. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 16 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

20. A device for recording and reading signals with respect to an optical recording medium claimed in claim 11 , comprising:

a first wobbled intermittent section for determining reference position placed at at least one reference position in said optical recording medium from push-pull signals detected from wobble;

a wobbled intermittent section detecting section for detecting a wobbled intermittent section or wobbled intermittent sections other than said first wobbled intermittent section each of which is selectively disposed at a predetermined position apart from said reference position by a predetermined distance; and

a control section for taking out information, which has been recorded in said wobbled intermittent section or sections other than said first wobbled intermittent section, based on detection signals from said wobbled intermittent section detecting section and utilizing said information thereby to record or read signals with respect to said optical recording medium.

21. An optical recording medium involving a guide groove wherein the guide groove is allowed to meander over substantially the whole length thereof to form wobble, and wobbled intermittent sections where there is no meandrous area are placed at predetermined positions in said wobble, comprising:

a first wobbled intermittent section for determining reference position being disposed at at least one reference position in said optical recording medium; and

second, third and fourth wobbled intermittent sections, said second, third and fourth wobbled intermittent sections each having a different length from one another, and each being disposed selectively at each predetermined position apart from each reference position by a predetermined distance.

22. An optical recording medium as claimed in claim 21 , wherein:

said first, second, third, or fourth wobbled intermittent section has a length corresponding to natural number-fold of a half cycle of the part other than said wobbled intermittent section in said wobble.

23. A method for recording and reading signals with respect to an optical recording medium claimed in claim 21 , comprising the steps of:

detecting a first wobbled intermittent section for determining reference position placed at at least one reference position in said optical recording medium from push-pull signals detected from wobble;

thereafter, detecting a wobbled intermittent section or wobbled intermittent sections other than said first wobbled intermittent section each of which is selectively disposed at a predetermined position apart from said reference position by a predetermined distance; and

utilizing information which has been recorded in said wobbled intermittent section or sections other than said first wobbled intermittent section to record or read said signals with respect to said optical recording medium.

24. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 23 , wherein:

the signals represented by said wobbled intermittent sections are detected by means of two comparators in each of which the upper limit is compared with the lower limit with respect to said push-pull signals as well as of reference signals in synchronization with wobble signals.

25. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 23 , wherein:

one of said two comparators detects a first level or higher levels of said push-pull signals, the other comparator detects a second level or lower levels of said push-pull signals, and the detection signals obtained from these comparators are compared with said reference signals, whereby signals from the wobbled intermittent sections are detected.

26. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 24 , wherein:

one of said two comparators detects a first level or higher levels of said push-pull signals, the other comparator detects a second level or lower levels of said push-pull signals, and the detection signals obtained from these comparators are compared with said reference signals, whereby signals from the wobbled intermittent sections are detected.

27. A method of recording and reading signals with respect to an optical recording medium as claimed in claim 24 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

28. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 25 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

29. A method for recording and reading signals with respect to an optical recording medium as claimed in claim 26 , wherein:

each cycle of said reference signals corresponds to each half cycle of said push-pull signals.

30. A device for recording and reading signals with respect to an optical recording medium claimed in claim 21 , comprising:

a first wobbled intermittent section for determining reference position placed at at least one reference position in said optical recording medium from push-pull signals detected from wobble;

a wobbled intermittent section detecting section for detecting a wobbled intermittent section or wobbled intermittent sections other than said first wobbled intermittent section each of which is selectively disposed at a predetermined position apart from said reference position by a predetermined distance; and

a control section for taking out information, which has been recorded in said wobbled intermittent section or sections other than said first wobbled intermittent section, based on detection signals from said wobbled intermittent section detecting section and utilizing said information thereby to record or read signals with respect to said optical recording medium.