Patent attributes
An optical recording disc is constituted by laminating a substrate, a reflective layer, a third dielectric layer, a light absorption layer, a second dielectric layer, a metal recording layer, a first dielectric layer and a light transmission layer in this order, and is constituted so that when a laser beam is irradiated onto the optical recording disc from the side of the light transmission layer, the metal recording layer is deformed and/or is changed in quality to form a state-changed region in the metal recording layer and the second dielectric layer and the light absorption layer are deformed and/or are changed in quality to form state-changed regions in the second dielectric layer and the light absorption layer, whereby a recording mark is formed in the metal recording layer, the second dielectric layer and the light absorption layer.
