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    • 84. 发明授权
    • Optical device with protective cover
    • 带保护盖的光学装置
    • US06249509B1
    • 2001-06-19
    • US08533740
    • 1995-09-26
    • Hideki HirataHajime UtsunomiyaIsamu KuribayashiHiroshi Tanabe
    • Hideki HirataHajime UtsunomiyaIsamu KuribayashiHiroshi Tanabe
    • G11B724
    • G11B7/24097G11B7/2403G11B7/24053
    • The invention provides an optical disc comprising a circular glass substrate (2) having information-carrying means (3) on one major surface. A protective member (4) of a resin includes a circular flat portion (42) and an annular rim (41) extending perpendicular from the periphery of the flat portion (42). The glass substrate (2) is integrally joined to the protective member (4) such that the information-carrying means (3) of the glass substrate (2) may face the covering portion (42) of the protective member (4). The outer side of the glass substrate (2) is surrounded by the protective member rim (41) to leave a shock absorbing space therebetween. The invention prevents the glass substrate from failure at its corner when impact is applied to the disc.
    • 本发明提供了一种光盘,其包括在一个主表面上具有信息传送装置(3)的圆形玻璃基板(2)。 树脂的保护构件(4)包括圆形平坦部分(42)和从平坦部分(42)的周边垂直延伸的环形边缘(41)。 玻璃基板(2)与保护构件(4)一体地接合,使得玻璃基板(2)的信息传送装置(3)可面向保护构件(4)的覆盖部分(42)。 玻璃基板(2)的外侧被保护构件边缘(41)包围,在其间留有减震空间。 本发明防止玻璃基板在对盘施加冲击时在其拐角处发生故障。
    • 89. 发明授权
    • Magneto-optical recording medium
    • 磁光记录介质
    • US5593789A
    • 1997-01-14
    • US353269
    • 1994-12-05
    • Hajime UtsunomiyaKenji UchiyamaMasanori KosudaHiroyasu Inoue
    • Hajime UtsunomiyaKenji UchiyamaMasanori KosudaHiroyasu Inoue
    • G11B11/105G11B5/66
    • G11B11/10586G11B11/10582Y10T428/265
    • This invention has for its object to provide a magneto-optical recording medium at low costs, which is high in magnetic field sensitivity and reliability, and enables high C/N to be obtained even at high linear velocity.The magneto-optical recording medium of this invention includes on a substrate a first dielectric film, a recording film of a rare earth element-transition element alloy (including Fe), a second dieleetric film containing a metal element M and nitrogen N and a reflective film. In this medium, the recording film is up to 65 nm in thickness, and the respective diffusion indices of oxygen, nitrogen and metal element M in the vicinity of the boundary between the second dielectric and recording films are within the predetermined ranges, when the element distribution is measured by Auger electron spectroscopy under the predetermined conditions. The maximum value of the oxygen content in the vicinity of said boundary is 5 to 25 at %.
    • 本发明的目的是提供一种低成本的磁光记录介质,其磁场灵敏度和可靠性高,并且即使在高线速度下也能获得高C / N。 本发明的磁光记录介质在基板上包括第一电介质膜,稀土元素 - 过渡元素合金(包括Fe)的记录膜,含有金属元素M和氮N的第二die膜和反射 电影。 在该介质中,记录膜的厚度达到65nm,并且在第二电介质和记录膜之间的边界附近,氧,氮和金属元素M的各自扩散指数在预定范围内, 在预定条件下通过俄歇电子能谱测量分布。 所述边界附近的氧含量的最大值为5〜25at%。