Information recording medium with index header
AssigneeKabushiki Kaisha Toshiba
InventorsAkihito Ogawa, Toshihiro Sugaya
Life of this patent
Estimating the term…
Abstract
An information recording medium has a plurality of stacked recording layers. Each recording layer has a spiral track which defines a plurality of rounds, and at least one index header aligned in the radial direction of the disk to partially intercept the spiral track. The index header has address data of each round of the spiral track, which is formed by embossed pits, and some or all of the index headers of the first and second recording layers are laid out to overlap each other when viewed from the predetermined surface.
Claims37
A disk-shaped information recording medium which has a first recording layer on which information can be recorded/reproduced by a light beam coming from a predetermined surface, and a second recording layer on which information can be recorded/reproduced by a light beam coming from the same predetermined surface, and which is stacked on said first recording layer, comprising:
- each of said first and second recording layers has
- a spiral track which defines a plurality of rounds, and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track,
- said index header has address data of each round of said spiral track, which is formed by embossed pits, and
- some or all of said index headers of said first and second recording layers are laid out to overlap each other when viewed from the predetermined surface.
A disk-shaped information recording medium comprising:
- a spiral track;
- and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track,
- said index header having address data recorded as an embossed pattern,
- said spiral track having an area where a plurality of recording fields each having a predetermined track length are recorded,
- each of said recording fields having a header field and a data field,
- said header field having address data,
- said data field having an area for recording user data,
- a specific one of said recording fields being recorded on said spiral track to extend across said index header,
- the specific recording field having first and second sub recording fields to have said index header as a boundary,
- said first sub recording field having a first header field,
- said second sub recording field having a second header field,
- said first and second header fields having identical address data, and
- said recording fields being recorded or reproduced at a constant linear velocity.
An information recording apparatus for recording data on a disk-shaped information recording medium which has a first recording layer on which information can be recorded/reproduced by a light beam coming from a predetermined surface, and a second recording layer on which information can be recorded/reproduced by a light beam coming from the same predetermined surface, and which is stacked on said first recording layer, and
- in which each of said first and second recording layers has
- a spiral track which defines a plurality of rounds, and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- said index header has address data of each round of said spiral track, which is formed by embossed pits,
- said apparatus comprising:
- recording means for irradiating said information recording medium with a reproduction light beam from the predetermined surface side, reading address data of said index header reflected in reflected light of the reproduction light beam, and recording data by irradiating a target spiral track with a recording light beam on the basis of the address data.
An information recording apparatus for recording information on a disk-shaped information recording medium, which comprises:
- a spiral track having wobbles of a constant cycle;
- and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- in which said index header has address data recorded as an embossed pattern,
- said apparatus comprising:
- recording field recording means for recording a plurality of recording fields each having a header field and a data field at a constant linear velocity on said spiral track on the basis of a signal obtained from the wobbles, recording a specific one of said recording fields on said spiral track across said index header, recording first and second sub recording fields in the specific recording field to have said index header as a boundary, and recording identical address data in a first header field of said first sub recording field and a second header field of said second sub recording field.
An information recording method for recording data on a disk-shaped information recording medium which has a first recording layer on which information can be recorded/reproduced by a light beam coming from a predetermined surface, and a second recording layer on which information can be recorded/reproduced by a light beam coming from the same predetermined surface, and which is stacked on said first recording layer, and
- in which each of said first and second recording layers has
- a spiral track which defines a plurality of rounds, and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- said index header has address data of each round of said spiral track, which is formed by embossed pits,
- said method comprising the step of:
- irradiating said information recording medium with a reproduction light beam from the predetermined surface side, reading address data of said index header reflected in reflected light of the reproduction light beam, and recording data by irradiating a target spiral track with a recording light beam on the basis of the address data.
An information recording method for recording information on a disk-shaped information recording medium, which comprises:
- a spiral track having wobbles of a constant cycle;
- and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- in which said index header has address data recorded as an embossed pattern,
- said method comprising the step of:
- recording a plurality of recording fields each having a header field and a data field at a constant linear velocity on said spiral track on the basis of a signal obtained from the wobbles, recording a specific one of said recording fields on said spiral track across said index header, recording first and second sub recording fields in the specific recording field to have said index header as a boundary, and recording identical address data in a first header field of said first sub recording field and a second header field of said second sub recording field.
An information reproduction apparatus for reproducing data recorded on a disk-shaped information recording medium which has a first recording layer on which information can be recorded/reproduced by a light beam coming from a predetermined surface, and a second recording layer on which information can be recorded/reproduced by a light beam coming from the same predetermined surface, and which is stacked on said first recording layer, and
- in which each of said first and second recording layers has
- a spiral track which defines a plurality of rounds, and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- said index header has address data of each round of said spiral track, which is formed by embossed pits,
- said apparatus comprising:
- reproduction means for irradiating said information recording medium with a reproduction light beam from the predetermined surface side, reading address data of said index header reflected in reflected light of the reproduction light beam, and reproducing data by irradiating a target spiral track with a reproduction light beam on the basis of the address data.
An information reproduction apparatus for reproducing information from a disk-shaped information recording medium, which comprises:
- a spiral track which has wobbles of a constant cycle, and on which a plurality of recording fields each having a predetermined track length are recorded;
- and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- in which said index header has address data recorded as an embossed pattern,
- each of said recording fields has a header field and a data field,
- said header field has address data,
- said data field has an area for recording user data,
- a specific one of said recording fields is recorded on said spiral track across said index header,
- the specific recording field has first and second sub recording fields to have said index header as a boundary,
- said first sub recording field has a first header field,
- said second sub recording field has a second header field, and
- said first and second header fields have identical address data,
- said apparatus comprising:
- reproduction means for reproducing said recording fields at a constant linear velocity on the basis of a signal obtained from the wobbles.
An information reproduction method for reproducing data recorded on a disk-shaped information recording medium which has a first recording layer on which information can be recorded/reproduced by a light beam coming from a predetermined surface, and a second recording layer on which information can be recorded/reproduced by a light beam coming from the same predetermined surface, and which is stacked on said first recording layer, and
- in which each of said first and second recording layers has
- a spiral track which defines a plurality of rounds, and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- said index header has address data of each round of said spiral track, which is formed by embossed pits,
- said method comprising the step of:
- irradiating said information recording medium with a reproduction light beam from the predetermined surface side, reading address data of said index header reflected in reflected light of the reproduction light beam, and reproducing data by irradiating a target spiral track with a reproduction light beam on the basis of the address data.
An information reproduction method for reproducing information from a disk-shaped information recording medium, which comprises:
- a spiral track which has wobbles of a constant cycle, and on which a plurality of recording fields each having a predetermined track length are recorded;
- and
- at least one index header aligned in a radial direction of the disk to partially intercept said spiral track, and
- in which said index header has address data recorded as an embossed pattern,
- each of said recording fields has a header field and a data field,
- said header field has address data,
- said data field has an area for recording user data,
- a specific one of said recording fields is recorded on said spiral track across said index header,
- the specific recording field has first and second sub recording fields to have said index header as a boundary,
- said first sub recording field has a first header field,
- said second sub recording field has a second header field, and
- said first and second header fields have identical address data,
- said method comprising the step of:
- reproducing said recording fields at a constant linear velocity on the basis of a signal obtained from the wobbles.
Dependencies are inferred from the claim text.