Patent ID: 8105750

Claim:
An optical recording medium comprising: a first recording layer; a semi-transmissive reflective layer; an optically-transparent material layer; and a second recording layer and a reflective layer formed on an optically-transparent substrate, wherein the first recording layer includes an organic dye shown by a general formula expressed by a chemical formula 1 below (in chemical formula 1, R1 is an alkyl group of carbon number 1 to 4; R2, R3 respectively are alkyl groups of carbon number 1 to 4, benzyl groups or groups forming 3 to 6 membered rings by being coupled; Y1, Y2 respectively are organic groups independently; and X is Cl0 4 , BF 4 , PF 6 , SbF 6 ) and an organic dye shown by a general formula expressed by a chemical formula 2 below (in chemical formula 2, R1, R4 are alkyl groups of carbon number 1 to 4; R2, R3 respectively are alkyl groups of carbon number 1 to 4, benzyl groups or groups forming 3 to 6 membered rings by being coupled; Y1, Y2 respectively are organic groups independently; and X is Cl0 4 BF 4 , PF 6 , SbF 6 ), or the first recording layer includes an organic dye shown by a general formula expressed by a chemical formula 3 below (in chemical formula 3, R1, R2 are alkyl groups of carbon number 1 to 4; Y1, Y2 respectively are organic groups independently; and X is Cl0 4 , BF 4 , PF 6 , SbF 6 ) and an organic dye shown by a general formula expressed by a chemical formula 4 below (in chemical formula 4, R1, R4 are alkyl groups of carbon number 1 to 4; R2, R3 are alkyl groups of carbon number 1 to 4 or groups forming 3 to 6 membered rings by being coupled; Y1, Y2 respectively are organic groups independently; and X is Cl0 4 , BF 4 , PF 6 , SbF 6 ), and wherein the second recording layer includes an organic dye according to the chemical formula 3 below, and an organic dye according to the chemical formula 4 below: