Patent ID: 7817526

Claim:
An optical recording medium comprising at least three recording layers including an L 0 layer, an L 1 layer, and an L 2 layer arranged in this order from a side farthest away from a laser light incident surface, the recording layers being irradiated with laser light to form recording marks different in a reflection from that of surrounding space areas, wherein the recording layers are made of respective materials that satisfy 0.93<Tb/Ta<1.07, where Ta is transmittance of light to reach the L 0 layer when recording marks are formed on all the recording layers excluding the L 0 layer, and Tb is transmittance of light to reach the L 0 layer when no recording mark is formed on any of the recording layers excluding the L 0 layer, Tb/Ta being a rate of change in light transmittance as taken from the laser light incident surface.