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93 条记录 (耗时 0.032 秒)

    Optically active compound and liquid crystal composition containing same
    67.
    发明授权
    Optically active compound and liquid crystal composition containing same 失效
    含有其的光学活性化合物和液晶组合物

    公开(公告)号：US5034152A

    公开(公告)日：1991-07-23

    申请号：US415383

    申请日：1989-09-28

    申请人： Kazuharu Katagiri ,  Kenji Shinjo ,  Kazuo Yoshinaga

    发明人： Kazuharu Katagiri ,  Kenji Shinjo ,  Kazuo Yoshinaga

    IPC分类号： C07C327/26 ,  C09K19/28 ,  C09K19/58

    CPC分类号： C07C327/26 ,  C09K19/28 ,  C09K19/58 ,  C09K19/586

    摘要： An optically active 4-alkylbenzenethiol and an optically active bis(4-alkylphenyl)disulfide represented by the formula: ##STR1## respectively, R.sub.1 * and R.sub.2 * are respectively an alkyl group having 1-12 carbon atoms including an asymmetric carbon atom, may be prepared, e.g., through halogenation or sulfonation of an optically active alcohol, followed by reaction with a phenylmagnesium halide, chlorosulfonylation and reduction. The optically active thiol or disulfide is effective, e.g., in preventing occurrence of reverse domain when added to a nematic liquid crystal, and also can be bonded to an intermediate to provide a functional material including a mesomorphic compound represented by the formula: ##STR2## wherein R.sub.3 is an alkyl or alkoxy group having 1-18 carbon atoms, n is 1 or 2, and C* is an asymmetric carbon atom.

    Recording method and recording apparatus
    68.
    发明授权
    Recording method and recording apparatus 失效
    记录方法和记录装置

    公开(公告)号：US4946261A

    公开(公告)日：1990-08-07

    申请号：US204730

    申请日：1988-06-10

    申请人： Hisao Yaegashi ,  Hideaki Mitsutake ,  Kazuo Yoshinaga ,  Masashi Miyagawa

    发明人： Hisao Yaegashi ,  Hideaki Mitsutake ,  Kazuo Yoshinaga ,  Masashi Miyagawa

    IPC分类号： G02F1/361 ,  G11B7/0045 ,  G11B7/244

    CPC分类号： G11B7/0045 ,  G02F1/3615 ,  G11B7/244

    摘要： A recording medium comprises a recording layer formed on a substrate. The recording layer comprises a solid solution of a guest compound in a matrix polymer. The guest compound, such as a para-di-substituted benzene derivative, has a substantial second order micro-nonlinear optical constant .beta. but shows substantially no nonlinear optical effect in its crystalline form. The matrix polymer is preferably a polyoxyalkylene. A part of the recording layer is caused to have a nonlinear optical effect when it is supplied with a combination of an external field such as an electric or magnetic field and heating followed by cooling for solidification, and is caused to lose its nonlinear optical effect when it is subjected to heating followed by cooling for solidification in the absence of such an external field.

    Surface acoustic wave convolver with dielectric film of high non-linear effect
    70.
    发明授权
    Surface acoustic wave convolver with dielectric film of high non-linear effect 失效
    具有高非线性效应的电介质膜的表面声波卷积器

    公开(公告)号：US4882715A

    公开(公告)日：1989-11-21

    申请号：US167254

    申请日：1988-03-11

    申请人： Koichi Egara ,  Norihiro Mochizuki ,  Kenji Nakamura ,  Kazuo Yoshinaga

    发明人： Koichi Egara ,  Norihiro Mochizuki ,  Kenji Nakamura ,  Kazuo Yoshinaga

    IPC分类号： G06G7/195

    CPC分类号： G06G7/195

    摘要： In a surface acoustic wave elastic convolver capable of showing sufficiently high convolution efficiency with a simple structure, the convolver comprises a piezo-electric substrate, plural input transducers formed on the substrate for respectively generating surface acoustic waves corresponding to input signals, an output transducer for obtaining a convolution signal of the input signals, from a surface acoustic wave generated by non-linear interaction, of the surface acoustic waves generated by those input transducers, and a dielectric film of a non-linear effect larger than that of the substrate, formed on the substrate in at least an area where the output transducer is formed.