Information recording/reproducing apparatus including setting optimum recording condition or reproducing condition

• US 5,410,527 A
• Filed: 07/28/1992
• Issued: 04/25/1995
• Est. Priority Date: 05/14/1985
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ashinuma, Takaaki
• Primary Examiner(s): Young, W. R.
• Application Number:
  US07/920,534
• Time in Patent Office: 1,001 Days
• Field of Search: 369/32, 369/48, 369/49, 369/54, 369/58, 369/275, 369/275.1-275.5, 369/13, 369/50, 369/116, 360/25, 360/28, 360/69
• US Class Current: 369/47.5
• CPC Class Codes: G11B 11/10504 Recording for shaping of magnetic domains G11B11/10528, for compensation of shift G11B11/1053
• CPC Class Codes: G11B 11/10515 Reproducing compensating pit shift G11B11/1053
• CPC Class Codes: G11B 11/1053 to compensate for the magnetic domain drift or time shift
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 19/02 Control of operating function, e.g. switching from recording to reproducing
• CPC Class Codes: G11B 7/0045 Recording G11B7/006, G11B7/0065 take precedence
• CPC Class Codes: G11B 7/126 Circuits, methods or arrangements for laser control or stabilisation
• CPC Class Codes: G11B 7/1267 Power calibration

Abstract

An information recording and reproducing apparatus includes: a recording device to record information to a recording medium such as a magnetooptic disc, optical disc, or the like; a reproducing device to reproduce the information recorded to this medium; and a controller to control the recording and reproducing devices on the basis of optimum recording and reproducing conditions for the recording medium which have preliminarily been recorded in a predetermined area of the medium. The recording device includes a laser beam generator or magnetic field generator. The reproducing device includes a laser beam generator. The controller controls a strength of the laser beam or magnetic field. With this apparatus, the recording and reproducing operations for the recording medium can always be performed in an optimum state, so that the reliability of the reproduced data is improved.

Claims

1. An information recording/reproducing apparatus for recording information on a recording medium under recording conditions which have been recorded by a method comprising the steps of measuring various characteristics of the recording medium, which affect recording conditions for recording of the information on the recording medium, determining a plurality of optimal recording conditions for the recording of the information on the recording medium, on the basis of the various characteristics of the recording medium measured in the measuring step, and recording the plurality of recording conditions determined in the determining step, on a predetermined area of the recording medium, said apparatus comprising:

recording means for recording information on the recording medium;

reproducing means for reproducing a plurality of recording condition signals representing the plurality of recording conditions previously recorded on the recording medium, wherein said plurality of recording condition signals includes a plurality of operation values of said recording means for effectively recording information on the recording medium; and

control means for controlling an operation of said recording means in accordance with the plurality of operation values reproduced by said reproducing means before information is recorded on the recording medium by said recording means.

2. An information recording/reproducing apparatus according to claim 1, wherein said recording means comprises light beam generating means for generating a light beam, and wherein said control means comprises means for controlling the power of the light beam upon recording.

3. An information recording/reproducing apparatus according to claim 1, wherein said recording means comprises magnetic field generating means for generating a magnetic field, and wherein said control means comprises means for controlling the strength of the magnetic field.

4. An information recording/reproducing apparatus according to claim 1, wherein the recording medium includes a control track comprising an area on which management information for managing information to be recorded on the recording medium is recorded, the operation values being recorded on the control track, and

wherein said reproducing means comprises means for reproducing an operation value of one of the recording conditions by scanning the control track.

5. An information recording/reproducing apparatus according to claim 1, wherein said recording means comprises means for optically recording information on the recording medium.

6. An information recording/reproducing apparatus according to claim 1, wherein said recording means comprises means for recording information on the recording medium by a photoelectromagnetic effect.

7. An information recording/reproducing apparatus according to claim 1, wherein said control means comprises means for controlling said recording means in accordance with an operation value represented by a predetermined number of bits.

8. An information recording/reproducing apparatus according to claim 1, wherein said recording means and said reproducing means comprise a common head.

9. An information reproducing apparatus for reproducing information recorded on a recording medium under recording conditions which have been recorded by a method comprising the steps of measuring various characteristics of the recording medium, which affect reproduction conditions for reproducing of the information from the recording medium, determining a plurality of optimal reproduction conditions for the reproduction of the information from the recording medium, on the basis of the various characteristics of the recording medium measured in the measuring step, and recording the plurality of reproduction conditions determined in the determining step, on a predetermined area of the recording medium, said apparatus comprising:

reproducing means for reproducing information recorded on the recording medium;

reading means for reading out a plurality of reproduction condition signals representing the plurality of reproduction conditions previously recorded on the recording medium, wherein said plurality of reproduction condition signals includes a plurality of operation values of said reproducing means for effectively reproducing information from the recording medium; and

control means for controlling an operation of said reproducing means in accordance with the plurality of operation values read out by said reading means before reproducing information recorded on the recording medium by said reproducing means.

10. An information reproducing apparatus according to claim 9, wherein said reproducing means comprises light beam generating means for generating a light beam, and wherein said control means comprises means for controlling the power of the light beam upon reproduction.

11. An information reproducing apparatus according to claim 9, wherein said reproducing means comprises analog-to-digital converting means and wherein said control means comprises means for controlling a threshold value of said analog-to-digital converting means.

12. An information reproducing apparatus according to claim 9, wherein said reproducing means comprises amplifying means for amplifying a reproduced signal, and wherein said control means comprises means for controlling the gain of said amplifying means.

13. An information reproducing apparatus according to claim 9, wherein said reproducing means comprises means for optically reproducing information recorded on the recording medium.

14. An information reproducing apparatus according to claim 9, wherein said reproducing means comprises means for reproducing information recorded on the recording medium by the Kerr effect or the Faraday effect.

15. An information reproducing apparatus according to claim 9, wherein said control means comprises means for controlling said reproducing means in accordance with an operation value represented by a predetermined number of bits.

16. An information reproducing apparatus according to claim 9, wherein the recording medium includes a control track comprising an area on which management information for managing information recorded on the recording medium is recorded, the operation values being recorded on the control track, and

wherein said reproducing means comprises means for reproducing an operation value of one of the reproduction conditions by scanning the control track.

17. An information reproducing apparatus according to claim 9, wherein said reproducing means and said reading means comprise a common head.

18. An information recording apparatus comprising:

recording means for recording information on a recording medium;

determining means comprising means for measuring various characteristics of the recording medium, which affect recording conditions of the recording of the information on the recording medium and, in accordance with the measured characteristics, for determining a plurality of operation values of said recording means for effectively recording information on the recording medium; and

control means for controlling said recording means such that said recording means records the plurality of operation values determined by said determining means on the recording medium.

19. An information reproducing apparatus according to claim 18, further comprising means for reproducing the information recorded on the recording medium, wherein said determining means further comprises means for causing said recording means to record a reference signal on the recording medium, for causing said reproducing means to reproduce the recorded reference signal and for measuring a characteristic of the recording medium by the reproduced signal.

20. An information reproducing apparatus according to claim 19, wherein said determining means comprises means for determining the operation value of said recording means such that a reproduction signal of the reference signal becomes a predetermined condition.

21. An information reproducing apparatus according to claim 20, wherein said determining means comprises means for determining the operation value of said recording means such that a duty ratio of the reproduction signal approaches 50%.

22. An information reproducing apparatus according to claim 20, wherein said determining means comprises means for changing the operation value of said recording means upon recording of the reference signal when the reproduction signal does not become a predetermined condition and means for again measuring a characteristic of the recording medium.

23. An information reproducing apparatus according to claim 22, wherein said control means comprises means for detecting the operation values and for controlling said determining means for changing another value of said recording means when said control means detects that one of the operation values for said recording means determined by said determining means has reached one of an upper limit and a lower limit within a control range.

24. An information recording apparatus according to claim 18, wherein said recording means comprises light beam generating means for generating a light beam, and said determining means comprises means for determining power of the light beam upon recording.

25. An information recording apparatus according to claim 18, wherein said recording means comprises magnetic field generating means for generating a magnetic field, and said determining means comprises means for generating strength of the magnetic field.

26. An information recording apparatus according to claim 18, wherein said control means comprises means for causing the operation value to be recorded on a control track of the recording medium and wherein the control track comprises an area on which management information for managing information to be recorded on the recording medium is recorded.

27. An information recording apparatus according to claim 18, further comprising reading means for reading out the operation value recorded on the recording medium;

and

second control means comprising means for controlling said reading means for reading out the operation value before information is recorded on the recording medium by said recording means and for controlling an operation of said recording means such that an operation condition of the recording means coincides with the operation value.

28. An information recording/reproducing apparatus comprising:

recording means for recording information on a recording medium, wherein said recording means comprises a plurality of elements;

determining means comprising means for measuring a characteristic of the recording medium, which affects recording conditions of the recording of the information on the recording medium and, in accordance with the measured characteristic, for determining a control value data for an element constituting the recording means which should be controlled;

first control means for controlling said recording means such that said recording means records the control value data determined by said determining means on the recording medium;

reproducing means for reproducing the control value data recorded on the recording medium; and

second control means comprising means for controlling said reproducing means for reproducing the control value data when information is recorded on the recording medium and for controlling the element of said recording means in accordance with the control value data reproduced by said reproducing means;

wherein said control means comprises deciding means for deciding whether or not the recording medium has been utilized, and when said deciding means decides that the recording medium has not been utilized, said control means permits the control value data to be recorded on the recording medium.

29. An information recording/reproducing apparatus comprising:

reproducing means for reproducing information recorded on a recording medium;

determining means comprising means for measuring various characteristics of the recording medium, which affect reproduction conditions of the reproduction of the information from the recording medium and for determining a plurality of operation values of said reproducing means for effectively reproducing information recorded on the recording medium; and

recording means for recording the plurality of operation values determined by said determining means recorded on the recording medium.

30. An information recording/reproducing apparatus according to claim 29, wherein said reproducing means comprises light beam generating means for generating a light beam, and said determining means comprises means for determining power of the light beam upon reproducing.

31. An information recording/reproducing apparatus according to claim 29, wherein said reproducing means comprises analog-to-digital converting means, and said determining means comprises means for determining a threshold value of said analog-to-digital converting means.

32. An information recording/reproducing apparatus according to claim 29, wherein said reproducing means comprises means for amplifying the reproduced signal, and said determining means comprises means for determining a gain of said amplifying means.

33. An information recording/reproducing apparatus according to claim 29, wherein said determining means comprises means for causing said recording means to record a reference signal on the recording medium, for causing said reproducing means to reproduce the recorded reference signal and measuring a characteristic of the recording medium by the reproduced signal.

34. An information recording/reproducing apparatus according to claim 33, wherein said determining means comprises means for determining the operation value of said reproducing means such that a reproduction signal of the reference signal becomes a predetermined condition.

35. An information recording/reproducing apparatus according to claim 34, wherein said determining means comprises means for determining the operation value of said reproducing means such that a duty ratio of the reproduction signal approaches 50%.

36. An information recording/reproducing apparatus according to claims 34, wherein said determining means comprises means for changing an operation value of said reproducing means upon reproduction of the reference signal when the reproduction signal does not become a predetermined condition and means for again measuring a characteristic of the recording medium.

37. An information recording/reproducing apparatus according to claim 36, wherein said determining means comprises means for changing the control value when the operation value reaches one of an upper limit and a lower limit within a control range.

38. An information recording/reproducing apparatus according to claim 29, wherein said recording means comprises means for recording the operation value on a control track of the recording medium, the control track comprising an area on which management information for managing information recorded on the recording medium is recorded.

39. An information recording/reproducing apparatus according to claim 29, further comprising:

reading means for reading out the operation value recorded on the recording medium; and

control means for controlling said reading means for reading out the operation value before information recorded on the record medium is reproduced by said reproducing means and for controlling said reproducing means such that an operation condition of said reproducing means coincides with the operation value read out by said reading means.

40. An information recording/reproducing apparatus comprising:

reproducing means for reproducing information recorded on a recording medium, wherein said reproducing means comprises a plurality of elements;

determining means comprising means for measuring a characteristic of the recording medium, which affects reproduction conditions of the reproduction of the information from the recording medium and for determining a control value data for an element constituting said reproducing means which should be controlled corresponding to the measured characteristic;

recording means for recording an operation value determined by said determining means recorded on the recording medium;

reading means for reading out the control value data and the operation value recorded on the recording medium; and

control means for controlling said reading means for reading out the control value data when information recorded on the recording medium is reproduced by said reproducing means and for controlling the element of said reproducing means in accordance with the control value data read out by said reading means;

wherein said control means comprises deciding means for deciding whether or not the recording medium has been utilized, and when said deciding means decides that the recording medium has not been utilized, said control means permits the control value data to be recorded by said recording means.

41. A method for recording conditions of information on a recording medium, comprising the steps of:

a) measuring various characteristics of the recording medium, which affect recording conditions for recording of the information on the recording medium;

b) determining a plurality of recording conditions optimal for the recording of the information on the recording medium, on the basis of the various characteristics of the recording medium measured in said measuring step; and

c) recording the plurality of recording conditions determined in said determining step, on a predetermined area of the recording medium.

42. A method according to claim 41, wherein said measuring step comprises the step of recording the information with predetermined recording conditions on the recording medium and subsequently reproducing the recorded information.

43. A method according to claim 42, wherein said measuring step comprises the step of repeating the recording and reproducing of the information with a change in the predetermined recording conditions.

44. A method according to claim 43, wherein said determining step comprises the step of determining recording conditions with which the information was satisfactorily reproduced in the repetition of reproduction in said measuring step, as the optimum recording conditions.

45. A method according to claim 41, wherein one of the plurality of recording conditions includes an intensity of a light beam for recording of the information on the recording medium.

46. A method according to claim 41, wherein one of the plurality of recording conditions includes the strength of magnetic field applied to the recording medium.

47. A method for recording reproduction conditions of information on a recording medium, comprising the steps of:

a) measuring various characteristics of the recording medium, which affect reproduction conditions for reproducing of the information from the recording medium;

b) determining a plurality of reproduction conditions optimal for the reproduction of the information from the recording medium, on the basis of the various characteristics of the recording medium measured in said measuring step; and

c) recording the plurality of reproduction conditions determined in said determining step, on a predetermined area of the recording medium.

48. A method according to claim 47, wherein said measuring step comprises the step of reproducing a predetermined information recorded on the recording medium with predetermined reproduction conditions.

49. A method according to claim 48, wherein said measuring step comprises the step of repeating the reproduction of the predetermined information with a change in the predetermined reproduction conditions.

50. A method according to claim 49, wherein said determining step comprises the step of determining the reproduction conditions with which the information was satisfactorily reproduced in the repetition of reproduction in said measuring step, as the optimum reproduction conditions.

51. A method according to claim 47, wherein one of the plurality of reproduction conditions includes an intensity of a light beam for reproduction of the information from the recording medium.