Patent ID: 7079479

Claim:
An optical disc in which data signals are recorded and reproduced by applying a laser beam having a wavelength of 380 nm to 450 nm to a data-recording layer and the reflectance is 15% to 25% to the beam having the wavelength, before the data signals are recorded, and is 0% to 10% after the data signals are recorded, the optical disc comprising: a substrate; a data-recording layer made of organic dye material directly formed on the substrate; a dielectric part on the data-recording layer; and a light-transmitting layer on the dielectric part and adhered to the dielectric part with an adhesive agent, wherein the data signals are recorded by applying the laser beam to the data-recording layer through the light-transmitting layer, the dielectric part comprises a nitride layer contacting the data-recording layer and an oxide layer or a fluoride layer laid on the nitride layer, and the nitride layer has a thickness of at most 10 nm.