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    • 8. 发明授权
    • Optical information recording medium and optical information
recording/reproducing method
    • 光信息记录介质和光信息记录/再现方法
    • US5811217A
    • 1998-09-22
    • US257470
    • 1994-06-09
    • Nobuo AkahiraKenichi NagataEiji OhnoKenichi NishiuchiNoboru Yamada
    • Nobuo AkahiraKenichi NagataEiji OhnoKenichi NishiuchiNoboru Yamada
    • G11B7/00G11B7/0045G11B7/005G11B7/24G11B7/241G11B7/254G11B7/257
    • G11B7/24G11B7/00454Y10S430/146
    • An optical information recording medium, which includes a substrate, and a recording thin film layer provided on the base material and adapted to form variation in an amount optically detectable by absorbing at least laser light so as to record information by partially varying the recording thin film layer and to reproduce the information by optically detecting the variation amount. The optical information recording medium further includes transparent layers each provided in contact with the recording thin film layer, and each of the transparent layers has optical thickness in which, in at least two different wavelengths .lambda., integral multiple of .lambda./2 is added to the thickness giving the large laser light absorption and large optical variation amount, respectively. More specifically, the optically detectable amount is of a reflectance factor variation, and in the different wavelengths .lambda.1 and .lambda.2, with respect to the thicknesses d1 and d2 of the transparent layers which give the optical characteristic more than 60% in the absorption, and more than 20% in the reflectance factor variation, the thickness of each transparent layer is arranged to be the thickness d having relation as represented by a following equation. d=d1+(.lambda.1/2).times.m=d2+(.lambda.2/2).times.1 (m, l: positive integer or zero).
    • 一种光学信息记录介质,其包括基板和设置在基材上的记录薄膜层,并且适于通过至少吸收激光来形成光学上可检测的量的变化,以便通过部分地改变记录薄膜来记录信息 并通过光学检测变化量再现信息。 光学信息记录介质还包括各自设置成与记录薄膜层接触的透明层,并且每个透明层具有光学厚度,其中在至少两个不同波长λ中的λ/ 2的整数倍被添加到 分别赋予大的激光吸收和大的光学变化量的厚度。 更具体地说,光学上可检测的量是反射率变化,并且在不同波长λ1和λ2中,相对于在吸收中给出大于60%的光学特性的透明层的厚度d1和d2, 和反射系数变化大于20%时,每个透明层的厚度被设置为具有如以下等式表示的关系的厚度d = d1 +(λ+ E,fra 1/2 + EE)xm = d2 +(λ+ E,fra 2/2 + EE)x1(m,l:正整数或零)。