Patent ID: 8029976

Claim:
An optical recording medium comprising a recording layer said recording layer further comprising: an organic dye expressed by a chemical formula 1; and an organic dye expressed by a chemical formula 2 wherein, a weight ratio of the organic dyes is 0.1≦W2/(W1+W2)≦0.8, where W1 is a weight of the organic dye represented by chemical formula 1 and W2 is a weight of the organic dye represented by chemical formula 2, the weight ratio is effective to reduce the jitter value to 6.4% or below when recording and/or reproduction speeds ranging from 1× to 16×, Chemical Formula 1 is: where (1) R1 is an alkyl group of carbon number 1 through 4, (2) each of R2 and R3 is an alkyl group of carbon number 1 through 4 and a benzyl group or are combined to form a group forming three to six-member ring by coupling, (3) each of Y1 and Y2 is independently an organic group, and (4) X represents ClO 4 , BF 4 , PF 6 and SbF 6 , and Chemical Formula 2 is where (1) each of R1 and R4 is an alkyl group of carbon number 1 through 4, (2) each of R2 and R3 is an alkyl group of carbon number 1 through 4 and a benzyl group or are combined to form a group forming three to six-member ring by coupling, (3) each of Y1 and Y2 is an organic group and (4) X is selected from a group consisting of ClO 4 , BF 4 , PF 6 and SbF 6 .