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    • 28. 发明授权
    • Liquid crystal compounds and method of preparation
    • 液晶化合物及其制备方法
    • US4629290A
    • 1986-12-16
    • US592497
    • 1984-03-22
    • Yoshio ShionozakiHiroshi Mukai
    • Yoshio ShionozakiHiroshi Mukai
    • C09K19/26G02F1/13C07C105/00C09K3/34
    • C09K19/26
    • Asymmetric trans-4,4'-dialkyl-ONN-azoxybenzenes having the general formula: ##STR1## wherein R.sub.1 and R.sub.2 are straight-chain alkyl groups having from 1 to 10 carbon atoms and R.sub.1 .noteq.R.sub.2 are provided. The azoxybenzene compounds are prepared by condensing corresponding P-alkylaniline ##STR2## and P-alkylnitrobenzene ##STR3## placing the reaction mixture into ammonium chloride and hydrolyzing to yield the asymmetrical azoxybenzene compound, corresponding asymmetrical azobenzene compound and asymmetric azobenzene compound. The asymmetric azoxy compound is then separated from the mixture by column chromotography and recrystallization. The asymmetric azoxybenzene compounds have a wide range of nematic liquid crystal temperature and are particularly well suited for liquid crystal compositions for use in matrix-addressing driving systems.
    • 提供了具有以下通式的不对称的反式-4,4'-二烷基-ONN-偶氮苯:其中R1和R2是具有1-10个碳原子的直链烷基和R1等于R2。 通过将相应的对烷基苯胺和P-烷基硝基苯(IMA)将反应混合物放入氯化铵中并水解,得到不对称的偶氮苯化合物,相应的不对称偶氮苯化合物和不对称偶氮苯化合物,制备偶氮氧苯化合物。 然后通过柱层析和重结晶从混合物中分离出不对称的氧化偶氮化合物。 不对称的苯氧基苯化合物具有宽范围的向列液晶温度,特别适用于用于矩阵寻址驱动系统的液晶组合物。
    • 30. 发明授权
    • Magnetic disk drive with spoiler
    • 带扰流板的磁盘驱动器
    • US07929246B2
    • 2011-04-19
    • US11810267
    • 2007-06-04
    • Keiichi TakemoriMasato IkegawaHiroshi MukaiHiroyuki IshiiYukinobu Abe
    • Keiichi TakemoriMasato IkegawaHiroshi MukaiHiroyuki IshiiYukinobu Abe
    • G11B33/14G11B5/55
    • G11B33/1473G11B25/043
    • Embodiments of the present invention prevent a magnetic disk drive from increasing in size and in manufacturing cost and reduces a positioning error of a magnetic head. An embodiment of a magnetic disk drive in accordance with the present invention includes: a disk-shaped magnetic disk that is rotated and driven; a magnetic head that reads and writes information to and from the magnetic disk, an arm that supports and moves the magnetic head; a spoiler that is close to a disk surface and extends in a radial direction of the disk; and a cabinet that houses these parts. The spoiler is disposed closer to an upstream side in a rotational direction of the disk than the arm and has a flow rate suppressing clearance positioned in a central portion in a peripheral direction of the spoiler, opened to both sides in an axial direction, and formed in a shape elongated in a radial direction of the disk.
    • 本发明的实施例防止了磁盘驱动器的尺寸和制造成本的增加,并降低了磁头的定位误差。 根据本发明的磁盘驱动器的实施例包括:旋转和驱动的盘形磁盘; 从磁盘读取和写入信息的磁头,支撑并移动磁头的臂; 扰流器,其靠近盘表面并沿盘的径向方向延伸; 和一个装有这些部件的橱柜。 该扰流板配置在比臂更靠近盘的旋转方向的上游侧,并且具有位于扰流器的周向的中心部分中的沿轴向两侧开口的流量抑制间隙,并形成 在圆盘的径向方向上延伸的形状。