Patent ID: 7316836

Claim:
An optical recording medium comprising: a transmission substrate; and a recording layer formed on said transmission substrate, said recording layer comprising a quencher, a first dye material expressed by chemical formula 1, and a second dye material expressed by chemical formula 2, wherein said chemical formula 1 is where R1 represents alkyl group having carbon numbers 1 to 4, R2 and R3 represent alkyl group having carbon numbers 1 to 4, benzyl group or groups combined to form 3 to 6 rings, Y1 and Y2 independently represent organic groups, and X represent ClO 4 , BF 4 , PF 6 , or SbF 6 , said chemical formula 2 is where R1 and R2 represent alkyl groups having carbon numbers 1 to 4, benzyl group or groups combined to form 3 to 6 rings, Y1 and Y2 independently represent organic groups and X represent ClO 4 , BF 4 , PF 6 , or SbF 6 , and said quencher comprises at least one quencher selected from the group consisting of