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发明授权
CN102047334B 光记录介质及光信息装置 有权

光记录介质及光信息装置
摘要：
本发明提供一种能够提高伺服信号及再生信号的质量的光记录介质及光信息装置。当将覆盖层(42)、第一中间层(43)、第二中间层(44)及第三中间层(45)的厚度tr1、tr2、tr3、tr4分别转换成指定折射率为no时的各层的厚度t1、t2、t3、t4时，在折射率为nrα及厚度为trα(1≤α≤n(α为自然数，n为4以上的整数))的层中产生的失焦量与在折射率为no及厚度为tα(1≤α≤n(α为自然数，n为4以上的整数))的层中产生的失焦量相等，厚度t1、t2、t3、t4满足|t1-(t2+t3+t4)|≥1μm、厚度t1、t2、t3、t4中的任意两值的彼此之差均为1μm以上以及|(t1+t2)-(t3+t4)|≥1μm。
摘要（英）：

Provided are an optical recording medium and an optical information device which improve the quality of a servo signal and a reproduction signal. When thicknesses tr1, tr2, tr3, tr4 of a cover layer (42), a first intermediate layer (43), a second intermediate layer (44), and a third intermediate layer (45) are respectively converted into thicknesses t1, t2, t3, t4 when a predetermined refraction index ''no'' is present, a defocus amount generated in the layer having a refraction index nralpha and a thickness tralpha (1 <= alpha <= n (alpha is a natural number and n is an integer not smaller than 4)) is equal to a defocus amount generated in the layer having a refraction index ''no'' and a thickness ta (1 <= alpha <= n (alpha is a natural number and n is an integer not smaller than 4)). Moreover, the thicknesses t1, t2, t3, t4 satisfy the following relationship: |t1 - (t2 + t3 + t4)| >= 1 [mu]m. A difference between arbitrary two values of the thicknesses t1, t2, t3, t4 is greater thanor equal to 1 [mu]m. Furthermore, the following relationship is satisfied: |(t1 + t2) - (t3 + t4)| >= 1 [mu]m.

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