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US 7,924,677 B2Granted
Optical recording medium with power calibration areas and a recording method therefor with optimum power control
AssigneeMitsubishi Kagaku Media Co., Ltd.
InventorsHideyuki Kubo, Hideharu Takeshima
Life of this patent
Estimating the term…
Abstract
In an optical recording medium having a plurality of recording layers on which information can be recorded by irradiating a laser beam from one side thereof, an optimum recording power to each of the recording layers can be determined. The optical recording medium has a plurality of recording layers on which information can be recorded by irradiating a laser beam from one side thereof, and each of the recording layers has a power calibration area (PCA) for optimizing the intensity of the laser beam.
Claims10
An optical recording medium comprising:
- an optical-transmissible first substrate;
- a first recording layer disposed on said first substrate, on which information can be recorded by irradiating a laser beam from the first substrate's side;
- a second recording layer disposed on said first recording layer, on which information can be recorded by irradiating said laser beam;
- and
- each of said first recording layer and said second recording layer including power calibration areas to optimizing intensity of said laser beam;
- wherein recording of information on said first recording layer and recording of information on said second recording layer are performed forward opposite directions, and
- a part of said first recording layer overlapping on said power calibration area of said second recording layer is in a previously-recorded state.
4 more elements
An optical recording medium comprising:
- an optical-transmissible first substrate;
- a first recording layer disposed on said first substrate, on which information can be recorded by irradiating a laser beam from the first substrate's side;
- a second recording layer disposed on said first recording layer, on which information can be recorded by irradiating said laser beam;
- and
- each of said first recording layer and said second recording layer including power calibration areas to optimizing intensity of said laser beam;
- wherein recording of information on said first recording layer and recording of information on said second recording layer are performed forward opposite directions, and
- said power calibration area of said second recording layer has an area not overlapped on said power calibration area of said first recording layer.
4 more elements
A recording method for an optical recording medium,
- said optical recording medium including an optical-transmissible first substrate;
- a first recording layer disposed on said first substrate, on which information can be recorded by irradiating a laser beam from the first substrate's side;
- a second recording layer disposed on said first recording layer, on which information can be recorded by irradiating said laser beam;
- and each of said first recording layer and said second recording layer including power calibration areas to optimizing intensity of said laser beam;
- the method comprising:
- performing recording of information on said first recording layer and recording of information on said second recording layer in forward opposite directions;
- wherein a part of said first recording layer overlapping on said power calibration area of said second recording layer is in a previously-recorded state.
4 more elements
A recording method for an optical recording medium,
- said optical recording medium including an optical-transmissible first substrate;
- a first recording layer disposed on said first substrate, on which information can be recorded by irradiating a laser beam from the first substrate's side;
- a second recording layer disposed on said first recording layer, on which information can be recorded by irradiating said laser beam;
- and
- each of said first recording layer and said second recording layer including power calibration areas to optimizing intensity of said laser beam;
- the method comprising:
- performing recording of information on said first recording layer and recording of information on said second recording layer in forward opposite directions;
- wherein said power calibration area of said second recording layer has an area not overlapped on said power calibration area of said first recording layer.
5 more elements
Dependencies are inferred from the claim text.