OPTICAL RECORDING MEDIUM AND METHOD OF MAKING OPTICAL RECORDING MEDIUM Russian patent published in 2014 - IPC G11B7/24 

FIELD: information technology.

SUBSTANCE: optical recording medium has four information recording surfaces. The optical recording medium satisfies the conditions: t3-t4≥1 mcm, t4-t2≥1 mcm, t2≥10 mcm and t1-(t2+t3+t4) ≥1 mcm, where t1 is the thickness between the surface of the medium and the first recording medium; t2 is the thickness between the first recording surface and the second recording surface, the second being closer to the surface of the optical recording medium; t3 is the thickness between the second surface and the third recording surface, the third surface being closer to the surface of the medium; t4 is thickness between the third recording surface and the fourth recording surface, which is further from the surface of the medium. The recording medium satisfies the conditions: 53.5 mcm-E1≤t1≤53.5 mcm+E1, 65.0 mcm-E2≤d2≤65.0 mcm+E2, 84.5 mcm-E3≤d3≤84.5 mcm+E3 and 100.0 mcm-E4≤d4≤100.0 mcm+E4, where di is the distance from the surface of the optical recording medium to the corresponding i-th information recording surface, E1, E2, E3 and E4 are tolerances on thickness t1 and distances d2, d3, and d4, respectively. Each of the tolerances E1, E2, E3 and E4 are set equal to or less than 6 mcm.

EFFECT: preventing deterioration of the playback signal due to damage of the surface of the optical recording medium.

16 cl, 13 dwg