Patent ID: 8144561

Claim:
A multilayer rewritable or recordable type optical recording medium wherein a laser light intended for recording can be adjusted and focused upon a target recording layer to be recorded so that the data may be recorded on the target recording layer selectively comprising: three or more recording layers of an L 0 layer, an L 1 layer, an L 2 layer, . . . , an Ln-2 layer, and an Ln-1 layer in order from a side farthest away from an incident surface of the laser light to a side closest to the incident surface of the laser light; and spacer layers interposed between the L 0 layer and the L 1 layer, between the L 1 layer and the L2 layer, and between the Ln-2 layer and the Ln-1 layer, wherein each of the spacer layers has a thickness in the range of approximately 5 to 90 μm, the recording layers are each irradiated with the laser light to form recording marks for information recording, and the recording layers are made of respective recording films having respective recording-reaction temperatures of T0, T1, . . . , Tn-1, where T0≦T1≦ . . . ≦Tn-1 and T 0 <T n-1 so that the recording layers have substantially the same recording sensitivities.