Patent ID: 7787353

Claim:
An optical recording medium comprising: at least a reflective layer, a lower dielectrics layer, a recording layer, an upper dielectrics layer and a light transmissive layer that are sequentially laminated on one main surface of a substrate, wherein, light having a wavelength in the range of 400 nm or more and 410 nm or less is focused with an optical system having a numeral aperture in the range of 0.84 or more and 0.86 or less followed by irradiating from a side of the light transmissive layer on the recording layer, and thereby an information signal is recorded and reproduced, the lower dielectrics layer includes a first lower dielectrics layer laminated onto a second lower dielectrics layer, the second lower dielectrics layer (i) spacing the reflective layer from the first lower dielectrics layer and (ii) formed of a material that inhibits corrosion of the reflective layer; and the upper dielectrics layer includes a first upper dielectrics layer and a second upper dielectrics layer laminated onto the first upper dielectrics layer, the second upper dielectrics layer (i) spacing the light transmissive layer from the first upper dielectrics layer and (ii) formed of a material that inhibits corrosion of the light transmissive layer.