Recording medium and information recording and reproducing method using the same

A recording medium, comprising:

• i) a substrate, and
• ii) a recording layer overlaid on the substrate,
• wherein the recording layer comprises multiple kinds of materials uniformly mixed together, each of which has properties such that, when recording light having a predetermined wavelength λ1 is irradiated to the material, the material is capable of being caused to change into a fluorescent material,
• the multiple kinds of the materials are capable of being caused by the recording light having different wavelengths λ1 to change into fluorescent materials,
• to the fluorescent materials, which have been formed by the multiple kinds of the materials, are capable of being caused by excitation light having different wavelengths λ2 to produce fluorescence, and
• the fluorescent materials, which have been formed by the multiple kinds of the materials, produce the fluorescence having different wavelengths λ3.

A recording medium, comprising:

• i) a substrate, and
• ii) a recording layer overlaid on the substrate,
• wherein the recording layer comprises multiple kinds of materials uniformly mixed together, each of which has properties such that, when recording light having a predetermined wavelength λ1 is irradiated to the material, the material is capable of being caused to change into a fluorescent material,
• the multiple kinds of the materials are capable of being caused by the recording light having different wavelengths λ1 to change into fluorescent materials,
• the fluorescent materials, which have been formed by the multiple kinds of the materials, are capable of being caused by excitation light having an identical wavelength λ2 to produce fluorescence, and
• the fluorescent materials, which have been formed by the multiple kinds of the materials, produce the fluorescence having different wavelengths λ3.

A recording medium, comprising:

• i) a substrate, and
• ii) a recording layer overlaid on the substrate,
• wherein the recording layer comprises multiple kinds of materials uniformly mixed together, each of which has properties such that, when recording light having a predetermined wavelength λ1 is irradiated to the material, the material is capable of being caused to change into a fluorescent material, the multiple kinds of the materials are capable of being caused by the recording light having different wavelengths λ1 to change into fluorescent materials,
• the fluorescent materials, which have been formed by the multiple kinds of the materials, are capable of being caused by excitation light having different wavelengths λ2 to produce fluorescence, and
• the fluorescent materials, which have been formed by the multiple kinds of the materials, produce the fluorescence having an identical wavelength λ3.