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    • 4. 发明授权
    • Data corruption detector for magnetic media
    • 用于磁性介质的数据损坏检测器
    • US5479097A
    • 1995-12-26
    • US175049
    • 1993-12-29
    • Samuel D. CheathamJerry L. DonzeJames M. Frary
    • Samuel D. CheathamJerry L. DonzeJames M. Frary
    • G01R33/12G11B23/02G11B23/36
    • G11B23/36G01R33/1207G11B23/021
    • A tape cartridge or other physical volume includes a housing configured to accommodate magnetic data storage media, such as a reel of magnetic tape. A magnetic field detector is coupled to the housing for indicating whether the housing has been exposed to a magnetic field of sufficient intensity to corrupt or bulk erase the magnetic media. In a first embodiment, the detector is implemented as a magnetic media element having a predefined pattern of magnetic domains recorded thereon. In a second embodiment, the detector is implemented with a magnetic film element having a predefined pattern of magnetic domains recorded thereon and a polarizing filter stacked on top of the magnetic film element to polarize light incident upon the magnetic film element. Based on the Kerr effect, light incident upon the magnetic domains will undergo a shift in polarization angle before being reflected back to the polarizing filter. Erasure or alteration of the magnetic domains will modify the polarization shift. A dielectric reflector disposed between the polarizing filter and the magnetic film element will multiply the Kerr effect. A reference image is provided for visual comparison of the light reflected from the magnetic domains.
    • 带盒或其他物理卷包括被配置为容纳磁数据存储介质(例如磁带卷)的外壳。 磁场检测器耦合到壳体,用于指示外壳是否暴露于足够强度的磁场以损坏或大量擦除磁性介质。 在第一实施例中,检测器被实现为具有记录在其上的预定义的磁畴图案的磁性介质元件。 在第二实施例中,检测器由具有记录在其上的磁畴的预定图案的磁性膜元件和层叠在磁性膜元件的顶部上的偏振滤光片来实现,以偏振入射在磁性膜元件上的光。 基于克尔效应,入射到磁畴的光在被反射回偏振滤光器之前会经历偏振角的偏移。 磁畴的擦除或改变将改变偏振偏移。 设置在偏振滤光器和磁膜元件之间的介质反射器将乘以克尔效应。 提供参考图像用于从磁畴反射的光的目视比较。
    • 5. 发明授权
    • Self sealing data storage element
    • 自密封数据存储元件
    • US5251090A
    • 1993-10-05
    • US743457
    • 1991-08-09
    • Samuel D. CheathamJerry L. Donze
    • Samuel D. CheathamJerry L. Donze
    • G11B23/107G11B23/26G03B15/32G11B23/02
    • G11B23/26G11B23/107
    • The self sealing data storage element presents a uniform form factor data storage element that can be used to house any one of a plurality of types of tape media. The tape media is wound around a single reel contained within a housing of predefined external dimensions. The housing includes an opening in one corner thereof through which the tape media is extracted by an associated drive element. In order to enable the drive element to securely grasp the tape media, a leader block is affixed to the end of the tape media nearest the opening in the housing. In order to provide the self-sealing capability, a length of leader tape is provided between the leader block and tape media in order to completely encapsulate the tape media once it is wound around the reel contained within the housing. The leader block is of width at least as great as that as the tape media and preferably slightly larger in order to automatically compensate for any lack of uniformity in the winding of the tape media on the reel. The leader tape can be any compliant material and is preferably an integral part of the tape media, such as the tape media absent the recording surface.
    • 自密封数据存储元件呈现可以用于容纳多种类型的磁带介质中的任何一种的均匀的形状因数数据存储元件。 磁带介质围绕包含在预定外部尺寸的壳体内的单个卷轴缠绕。 壳体在其一个角部中包括开口,通过该开口,磁带介质由相关的驱动元件提取。 为了使驱动元件牢固地抓住带介质,引导块被固定在最靠近外壳中的开口的磁带介质的端部。 为了提供自密封能力,在引导块和带介质之间提供一段引导带,以便在带介质缠绕在容纳在壳体内的卷轴上时完全包封带状介质。 引导块的宽度至少与带介质的宽度一样大,并且优选地略大,以便自动补偿卷轴上的带介质的卷绕中的任何不均匀性。 引导带可以是任何柔性材料,并且优选地是带介质的组成部分,例如不存在记录表面的带介质。