Magneto-optical storage medium having data in uniform magnetized recording direction

• US 6,901,034 B2
• Filed: 08/03/2001
• Issued: 05/31/2005
• Est. Priority Date: 04/05/2001
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Nanba, Yoshiyuki
• Primary Examiner(s): DINH, TAN X
• Application Number:
  US09/921,523
• Publication Number:
  US 20020150001A1
• Time in Patent Office: 1,397 Days
• Field of Search: 369/13.03, 369/13.42, 369/275.3, 369/13.35, 369/13.54, 369/13.55, 369/13.14, 369/13.06, 369/13.07, 428/64.1, 428/64.3, 428/64.4, 428/694.ML, 428/694.MM
• US Class Current: 369/13.03
• CPC Class Codes: G11B 11/10515 Reproducing compensating pit shift G11B11/1053
• CPC Class Codes: G11B 11/10523 Initialising
• CPC Class Codes: G11B 11/10526 Bulk initialisation or erasing, e.g. at least one whole information track with a single action
• CPC Class Codes: G11B 11/10582 Record carriers characterised by the selection of the material or by the structure or form
• CPC Class Codes: G11B 11/10584 characterised by the form, e.g. comprising mechanical protection elements
• CPC Class Codes: G11B 11/10597 Adaptations for transducing various formats on the same or different carriers

Abstract

A magnetooptic recording medium has at least a recording layer for recording data and a reproducing layer for reproducing the data recorded in the recording layer onto a substrate and reproduces the data by setting a proper reproducing laser power upon reproduction. According to the magnetooptic recording medium, magnetizing directions of a buffer area, a sector address area, and a gap area which are sandwiched between data areas in which the data is recorded are uniformly magnetized in the recording direction.

Claims

1. A magnetooptic recording medium in which at least a recording layer for recording data and a reproducing layer for reproducing the data recorded in said recording layer are formed on a substrate, a data area where the data is reproduced by a magnetooptical method and a sector address area where the data is optically reproduced are included, and the data in said data area is reproduced by a reproducing laser power higher than that in said sector address area upon reproduction, wherein

magnetizing directions of a buffer area, the sector address area, and a gap area which are sandwiched between successive said data areas are in a recording direction for said reproducing layer and said recording layer, which initializes said buffer, sector address, and gap areas.

2. A medium according to claim 1, wherein a mark in said recording layer is reflected from an aperture sandwiched between a front mask formed ahead of a reproducing beam in said reproducing layer and a rear mask formed behind the reproducing beam, and the data is reproduced by an MSR (Magnetically Induced Super Resolution) process.

3. A medium according to claim 1, wherein a signal is recorded and reproduced onto/from one or both of lands and grooves formed alternately on the medium.

4. A magnetooptic recording medium in which at least a recording layer for recording data and a reproducing layer for reproducing the data recorded in said recording layer are formed on a substrate and the recorded data is reproduced by setting a proper reproducing laser power upon reproduction, wherein

a front portion of a data area for said reproducing layer and said recording layer in which the data is recorded is uniformly magnetized in a recording direction.

5. A medium according to claim 4, wherein a mark in said recording layer is reflected from an aperture sandwiched between a front mask formed ahead of a reproducing beam in said reproducing layer and a rear mask formed behind the reproducing beam, and the data is reproduced by an MSR (Magnetically Induced Super Resolution) process.

6. A medium according to claim 4, wherein a signal is recorded and reproduced onto/from one or both of lands and grooves formed alternately on the medium.

7. A magnetooptic recording medium, wherein a portion of an emboss area or a space area of a reproducing layer for reproducing data and a recording layer for recording the data are before or after a data area in which data is magnetooptically recorded is uniformly magnetized in a recording direction.

8. A magnetooptic recording medium in which at least a recording layer for recording data and a reproducing layer for reproducing the data recorded in said recording layer are formed on a substrate, a data area where the data is reproduced by a magnetooptical method and a sector address area where the data is optically reproduced are included, and the data in said data area is reproduced by a reproducing laser power higher than that in said sector address area upon reproduction, wherein

magnetizing directions of areas including an emboss area before said data area are uniform in a recording direction for said reproducing layer and said recording layer, which initializes said areas.