| 摘要 |
<p>598836 Disclosed is a multilayer optical disk consisting of a series of alternating layers of optically transparent materials. The layers of optically transparent materials are combined into groups incorporating a ducting layer (4) of material with a refractive index of n1 lying between an insulating layer (5) of material with a refractive index n2 satisfying the relationship n2 < n1 and a layer of photochromic material (6) with a refraction index n3. The refractive indices of materials of the ducting (4) and information (6) layers satisfy the condition |n3 - n1| < 0.001.</p> |
