申请人:Kurose Yutaka
                            
                            
                                公开号:US20100173114A1
                            
                            
                                公开(公告)日:2010-07-08
                            
                            An optical recording medium on which high-density recording and reading of optical information can be conducted by a short-wavelength light such as a blue laser beam is provided.
In an optical recording medium comprising at least a substrate and a recording layer thereon that can record or read information by irradiation with light, the recording layer contains an azacyanine dye represented by general formula [I]:
wherein R
1
and R
2
each independently represent a hydrogen atom or an optionally substituted linear or branched alkyl group having one to four carbon atoms; R
3
represents a hydrogen atom or a hydrocarbon group; R
4
represents a hydrogen atom or a linear or branched alkyl group having one to four carbon atoms; R
5
represents an optionally substituted aromatic ring group or an optionally substituted unsaturated heterocyclic group; R
4
and R
5
may be combined together to form a ring; X
−
represents a counter anion; and the benzene ring A may be optionally substituted.