Optical information recording medium and recording method thereof

An optical information recording medium comprising:

• a light-transmitting substrate;
• and
• an optical recording layer containing a light-absorbing substance constituted by a dyestuff which is capable of absorbing laser beam,
• wherein an optically readable information is recorded through an irradiation of the laser beam onto the optical recording layer and by taking advantage of the discoloration of the dyestuff while retaining the molecular composition of the dyestuff, wherein said dyestuff is a dye compound represented by the following chemical formula (3):

An optical information recording medium comprising:

• a light-transmitting substrate;
• and
• an optical recording layer containing a light-absorbing substance constituted by a dyestuff which is capable of absorbing laser beam,
• wherein an optically readable information is recorded through an irradiation of the laser beam onto the optical recording layer and by taking advantage of the discoloration of the dyestuff while retaining the molecular composition of the dyestuff, wherein said dyestuff is a dye compound represented by the following chemical formula (4):

An optical information recording medium comprising:

• a light-transmitting substrate;
• and
• an optical recording layer containing a light-absorbing substance constituted by a dyestuff which is capable of absorbing laser beam,
• wherein an optically readable information is recorded in the optical recording layer through an irradiation of the laser beam onto the optical recording layer and by taking advantage of the discoloration of the dyestuff while retaining the molecular composition of the dyestuff, the optical information recording medium being characterized in that a dye compound represented by the following chemical structure (5) is employed as the dyestuff:
• wherein “A” is a substituted or unsubstituted aryl group or a heterocyclic group;
• R1, R2, R3 and R4 are individually a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group;
• “B” and “C” are individually a residue of aromatic ring;
• and “X” is a substituted or unsubstituted linking group.