Abstract: For improving the jitter property and ensuring the high reliability of an optical disk, a metal film containing phosphorus is disposed in a reflective layer. The layer has a hardness of 60 mgf/?m2 or more as nano indentation hardness, and an adhesive layer used for bonding has a glass transition temperature of 100° C. or higher but 200° C. or lower, an elastic modulus at 25 to 80° C. of 1000 MPa or more, and an adhesion strength of 4N or more. The dye for the dye recording layer has a water solubility of 20% or less as measured as light absorbance of hot water in which the dye recording layer is soaked.

Abstract: It is an object to provide optical information recording media enabling the recording at high speeds and high densities, such as onto DVD-R discs or similar, of optical information, optimizing the shape of meandering land pre-pits 21, increasing clearness of diffraction of laser light 9 by the land pre-pits 21 to obtain a satisfactory land pre-pit signal, and simultaneously reducing RF readout errors for recorded pits and readout errors for land pre-pits 21, focusing on optimization of the size of the inside protruding portion 23 and outside protruding portion 25 relative to the spot 9S of the laser light 9 with respect to the shape and size of the land pre-pits 21, and when e is the base of natural logarithms, the media is characterized in that the inside edge portions 22 of the inside protruding portion 23 and the outside edge portions 24 of the outside protruding portion 25 of the land pre-pits 21 are positioned within the range of the spot diameter E2 in the 1/e2 portion of the Gaussian energy distributio

Abstract: For improving the humidity resistance reliability and the jitter property of an optical disk, the adhesive layer used for bonding a bonding type optical information recording medium is defined such that the glass transition temperature is 100° C. or higher at 200° C. or lower, the modulus of elasticity at 25 to 80° C. is 1000 MPa or more, the adhesion strength thereof is 4N or more, the reflective layer is defined such that the hardness is 60 mgf/?m2 or more as the nano indentation hardness, and the dye recording layer is defined such that the water solubility of the dye as light absorption is 0.2 or less.

Abstract: For improving the jitter property and ensuring the high reliability of an optical disk, a metal film containing phosphorus is disposed in a reflective layer. The layer has a hardness of 60 mgf/?m2 or more as nano indentation hardness, and an adhesive layer used for bonding has a glass transition temperature of 100° C. or higher but 200° C. or lower, an elastic modulus at 25 to 80° C. of 1000 MPa or more, and an adhesion strength of 4N or more. The dye for the dye recording layer has a water solubility of 20% or less as measured as light absorbance of hot water in which the dye recording layer is soaked.

Abstract: An optical information recording medium comprising a substrate and an overlaying optical interference layer containing a trimethine dibenzoindolenine cyanine dye of a symmetric structure is capable of recording information with a laser beam having a wavelength of 640 nm or longer at a low recording power and the recorded information can be reproduced with the same laser.