Optical recording method
AssigneeHitachi, Ltd.
InventorsMotoyasu Terao, Masahiro Ojima, Yoshio Taniguchi, Yasushi Tomioka, Shuji Imazeki
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Abstract
In an optical recording method which utilizes hole burning, a plurality of sorts of light absorption centers having different properties are caused to coexist or to exist in the form of layers, thereby to remove the problem that, although the multiplicity of recording is high, the spacial recording density is low, so the overall recording density is low. Accordingly, the present invention can provide an optical recording method of very high recording density.
Claims10
An optical recording method utilizing hole burning with light, comprising:
- providing a recording medium having a recording layer containing therein at least first and second groups of light absorption centers, said first group of light absorption having a first inhomogeneous absorption band covering a different set of wavelengths than a set of wavelengths covered by a second inhomogeneous absorption band of said second group;
- projecting light at a plurality of wavelengths within said set of wavelengths covered by said first inhomogeneous absorption band onto a spot on said recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light a light absorption center of said first group;
- and
- projecting light at a plurality of wavelengths within said set of wavelengths covered by said second inhomogeneous absorption band onto said spot on said recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light absorption center of said second group, whereby a high recording density can be realized.
An optical recording method utilizing hole burning with light comprising:
- providing a recording medium comprising at least a first recording layer containing a first group of light absorption centers and a second recording layer containing a second group of light absorption centers, said first group of light absorption centers having a first inhomogeneous absorption band covering a different set of wavelengths than a set of wavelengths covered by said second inhomogeneous absorption band of said second group;
- projecting light at a plurality of wavelengths within said set of wavelengths covered by said first inhomogeneous absorption band onto a spot on said first recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light absorption center of said first group;
- and
- projecting light at a plurality of wavelengths within said set of wavelengths covered by said second inhomogeneous absorption band onto a spot on said second recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light absorption center of said second group, whereby high recording density can be realized.
An optical recording medium having a recording layer containing therein at least first and second groups of light absorption centers, said first group of light absorption having a first inhomogeneous absorption band covering a different set of wavelengths than a set of wavelengths covered by a second inhomogeneous absorption band of said second group;
- wherein high density recording is accomplished by projecting light at a plurality of wavelengths within said set of wavelengths covered by said first inhomogeneous absorption band onto a spot on said recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light a light absorption center of said fist group;
- and projecting light at a plurality of wavelengths within said set of wavelengths covered by said second inhomogeneous absorption band onto said spot on said recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light absorption center of said second group.
An optical recording medium comprising at least a first recording layer containing a first group of light absorption centers and a second recording layer containing a second group of light absorption centers, said first group of light absorption centers having a first inhomogeneous absorption band covering a different set of wavelengths than a set of wavelengths covered by said second inhomogeneous absorption band of said second group;
- wherein high density recording is accomplished by projecting light at a plurality of wavelengths within said set of wavelengths covered by said first inhomogeneous absorption band onto a spot on said first recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light absorption center of said first group;
- and projecting light at a plurality of wavelengths within said set of wavelengths covered by said second inhomogeneous absorption band onto a spot on said second recording layer thereby burning a plurality of narrow spectral holes at various wavelengths in the inhomogeneous absorption band of a light absorption center of said second group.
Dependencies are inferred from the claim text.