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    • 12. 发明授权
    • Optical disc
    • 光盘
    • US5851729A
    • 1998-12-22
    • US703792
    • 1996-08-27
    • Atsushi TakeuchiShuichi IgarashiMikio Yoshida
    • Atsushi TakeuchiShuichi IgarashiMikio Yoshida
    • G11B7/0045G11B7/24G11B7/243G11B7/258
    • G11B7/258G11B7/00451G11B7/24G11B7/243G11B2007/24314G11B2007/24316G11B7/2531G11B7/2533G11B7/2542G11B7/2585Y10S430/146
    • An optical disc having, as a recording layer, a first Sb--Se based thin film, a Bi--Te based thin film and a second Sb--Se based thin film, deposited in this order on a disc substrate, and a thin Al film deposited on the recording layer, is disclosed. Each of the first Sb--Se thin film and the second Sb--Se thin film has a composition such that Se accounts for not less than 70 atm % of the composition. The film thicknesses of the first Sb--Se based thin film and the second Sb--Se based thin film are set to not larger than 30 nm and to 15 to 25 nm, respectively, with the reflectance of the recording layer with respect to the laser beam with a wavelength of 680 nm being 10 to 25%. Alternatively, the first Sb--Se based thin film is of Sb.sub.2 Se.sub.3, the Bi--Te based thin film is of Bi.sub.2 Te.sub.3 and the second Sb--Se based thin film is of Sb.sub.2 Se.sub.3, and the film thickness of the second Sb--Se based thin film is set to 15 to 25 nm, so that the reflectance of the recording layer with respect to the laser beam with a wavelength of 680 nm will be 10 to 25%.
    • 具有作为记录层的光盘,其具有依次沉积在盘基片上的第一Sb-Se基薄膜,Bi-Te基薄膜和第二Sb-Se基薄膜,以及薄Al膜 沉积在记录层上。 所述第一Sb-Se薄膜和所述第二Sb-Se薄膜中的每一种具有使得Se占所述组合物不小于70atm%的组成。 第一Sb-Se系薄膜和第二Sb-Se系薄膜的膜厚分别设定为30nm以上且15〜25nm,记录层相对于激光的反射率 波长为680nm的光束为10〜25%。 或者,第一Sb-Se系薄膜为Sb2Se3,Bi-Te系薄膜为Bi2Te3,第二Sb-Se系薄膜为Sb2Se3,第二Sb-Se系薄膜的膜厚为 设定为15〜25nm,记录层相对于波长680nm的激光的反射率为10〜25%。
    • 17. 发明授权
    • Optical disc having a protective layer which is thicker at its outer
periphery
    • 具有保护层的光盘在其外周较厚
    • US6091580A
    • 2000-07-18
    • US368656
    • 1999-08-05
    • Mikio YoshidaMasaki Takenouchi
    • Mikio YoshidaMasaki Takenouchi
    • G11B7/24G11B11/10G11B11/105G11B5/82
    • G11B11/10584G11B11/1058G11B7/24056
    • An optical disc having a functional film, formed by a thin metal plate, and a protective film, formed on a transparent substrate, is disclosed. The protective film satisfies a condition d.gtoreq.2d.sub.0, where d is a maximum film thickness at an outer periphery of the protective film and d.sub.0 is a mean film thickness at a flat portion on a data area. A magneto-optical disc having a functional film which is a metal thin film having magneto-optical effects is also disclosed, wherein the protective film satisfies a condition that a difference L.sub.1 between a maximum film thickness d at the outer periphery of the protective film and a mean film thickness d.sub.0 at a flat portion of the data area is 40 .mu.m or less and the protective film has a curved surface having a radius of curvature R.sub.1 .gtoreq.12.48 mm at the outer periphery of the protective film. The present invention provides an optical disc having superior recording properties and a sufficient corrosion resistance even when the disc is provided with a highly corrosive thin metal film, such as a rare earth-transition metal amorphous thin film.
    • 公开了一种具有由薄金属板形成的功能膜和形成在透明基板上的保护膜的光盘。 保护膜满足条件d> / = 2d0,其中d是保护膜外周的最大膜厚度,d0是数据区域的平坦部分的平均膜厚度。 还公开了具有作为具有磁光效应的金属薄膜的功能膜的磁光盘,其中保护膜满足以下条件:保护膜外周的最大膜厚d与 在数据区的平坦部分的平均膜厚度d0为40μm以下,保护膜在保护膜的外周具有曲率半径R1> / = 12.48mm的曲面。 本发明提供一种具有优良的记录性能和足够的耐腐蚀性的光盘,即使当该盘具有高度腐蚀性的金属薄膜,例如稀土 - 过渡金属非晶薄膜。
    • 18. 发明授权
    • Optical disc having a protective layer which is thicker at its outer
periphery
    • 具有保护层的光盘在其外周较厚
    • US6016303A
    • 2000-01-18
    • US7139
    • 1998-01-14
    • Mikio YoshidaMasaki Takenouchi
    • Mikio YoshidaMasaki Takenouchi
    • G11B7/24G11B11/10G11B11/105G11B5/84
    • G11B11/10584G11B11/1058G11B7/24056
    • An optical disc having a functional film, formed by a thin metal plate, and a protective film, formed on a transparent substrate, is disclosed. The protective film satisfies a condition d.gtoreq.2d.sub.0, where d is a maximum film thickness at an outer periphery of the protective film and d.sub.0 is a mean film thickness at a flat portion on a data area. A magneto-optical disc having a functional film which is a metal thin film having magneto-optical effects is also disclosed, wherein the protective film satisfies a condition that a difference L.sub.1 between a maximum film thickness d at the outer periphery of the protective film and a mean film thickness d.sub.0 at a flat portion of the data area is 40 .mu.m or less and the protective film has a curved surface having a radius of curvature R.sub.1 .gtoreq.12.48 mm at the outer periphery of the protective film. The present invention provides an optical disc having superior recording properties and a sufficient corrosion resistance even when the disc is provided with a highly corrosive thin metal film, such as a rare earth-transition metal amorphous thin film.
    • 公开了一种具有由薄金属板形成的功能膜和形成在透明基板上的保护膜的光盘。 保护膜满足条件d> / = 2d0,其中d是保护膜外周的最大膜厚度,d0是数据区域的平坦部分的平均膜厚度。 还公开了具有作为具有磁光效应的金属薄膜的功能膜的磁光盘,其中,所述保护膜满足以下条件:外部的最大膜厚+ E,d d + EE之间的差值L1 保护膜的周边,数据区域的平坦部分的平均膜厚度d0为40μm以下,保护膜具有曲率半径R1> / = 12.48mm的弯曲面, 保护膜。 本发明提供一种具有优良的记录性能和足够的耐腐蚀性的光盘,即使当该盘具有高度腐蚀性的金属薄膜,例如稀土 - 过渡金属非晶薄膜。