Patent ID: 6849316

Claim:
An information recording medium comprising a support and a recording layer provided thereon on which information can be recorded by means of a laser beam; wherein said recording layer contains a dye compound having the following formula (I-1) or (I-2): in which each of A 1 , A 2 , B 1 and B 2 independently represents a substituent group; each of Y 1 and Z 1 independently represents a group of atoms required for forming a carbon ring or a heterocydlic ring; each of E and G independently represents a group of atoms required for forming a conjugated double bond chain; X 1 represents ═O, ═NR or ═C(CN) 2 , wherein R is a substituent group; X 2 represents —O, —NR or —C(N) 21 wherein R is a substituent group; each of L 1 , L 2 , L 3 , L 4 and L 5 independently represents a methine group which may have a substituent group; M k+ represents an onium ion containing a positively charged onium atom to which no hydrogen atom is attached; each of m and n independently is an integer of 0, 1 or 2; each of x and y, independently is an integer of 0 or 1; and x is an integer of 1 to 10.