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    External magnetic field device for a magnetooptical information recording and reproducing apparatus
    6.
    发明授权
    External magnetic field device for a magnetooptical information recording and reproducing apparatus 失效
    用于磁光信息记录和再现装置的外部磁场装置

    公开(公告)号：US5343448A

    公开(公告)日：1994-08-30

    申请号：US949335

    申请日：1992-09-22

    申请人： Tomoyuki Miyake ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Takahiro Miyake ,  Kenji Ohta ,  Shozo Kobayashi

    发明人： Tomoyuki Miyake ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Takahiro Miyake ,  Kenji Ohta ,  Shozo Kobayashi

    IPC分类号： G11B11/105 ,  G11B11/00 ,  G11B11/10

    CPC分类号： G11B11/10508

    摘要： An external magnetic field device for a magnetooptical information recording and reproducing apparatus in which an external magnetic field to be applied to a magnetooptical information recording medium is modulated by supplying to a magnetic head an alternate current the polarity of which is changed according to information to be recorded. The device comprises an offset circuit for producing an offset in the alternate current. The direction of the offset is selected so as to increase the current level of the polarity by which the initial magnetization of the information recording medium is reversed. The direction of the offset may be selected so as to cancel the leakage magnetic field.

    摘要翻译： 一种用于磁光信息记录和再现装置的外部磁场装置，其中通过向磁头提供施加到磁光信息记录介质的外部磁场，该极性的极性根据要被改变的信息而改变 记录。 该装置包括用于在交流电中产生偏移的偏置电路。 选择偏移的方向，以便增加信息记录介质的初始磁化反转的极性的电流电平。 可以选择偏移的方向以抵消泄漏磁场。

    Magnetic disk device with floating-type magnetic head
    8.
    发明授权
    Magnetic disk device with floating-type magnetic head 失效
    带浮动磁头的磁盘装置

    公开(公告)号：US5303100A

    公开(公告)日：1994-04-12

    申请号：US752052

    申请日：1991-08-29

    申请人： Junichiro Nakayama ,  Hiroyuki Katayama ,  Tomoyuki Miyake ,  Kenji Ohta

    发明人： Junichiro Nakayama ,  Hiroyuki Katayama ,  Tomoyuki Miyake ,  Kenji Ohta

    IPC分类号： G11B21/21 ,  G11B5/54 ,  G11B11/10 ,  G11B11/105 ,  G11B19/20 ,  G11B21/12 ,  G11B5/55

    CPC分类号： G11B19/20 ,  G11B11/10556 ,  G11B11/1058 ,  G11B11/10586 ,  G11B11/10595 ,  G11B5/54

    摘要： A magnetic disk device having a floating-type magnetic head, for use with a disk-shaped recording medium having a sliding area for the floating-type magnetic head formed outside a recording area. The length in the disk radial direction of a suspension supporting the floating-type magnetic head is varied depending on individual magnetic disk devices. In another arrangement, a control means is provided for setting two reference values so that a radial position of the floating-type magnetic head detected by a detection section is compared with these reference values, and for alternating one of the preset reference values to the other reference value upon receiving a rotation stop signal. In still another arrangement, control means is provided, whereby a radial position for sliding of the floating-type magnetic head is randomly varied within the sliding area. According to these arrangements, since the radial position for sliding of the floating-type magnetic head is varied within the sliding area without being located at the same position, abrasion within the sliding area can be dispersed. As a result, it becomes possible to extend the longevities of the floating-type magnetic head and the recording medium.

    摘要翻译： 一种具有浮动型磁头的磁盘装置，与形成在记录区域之外的浮动型磁头的滑动区域的盘形记录介质一起使用。 支撑浮动型磁头的悬架的盘径方向上的长度根据各个磁盘装置而变化。 在另一种布置中，提供控制装置用于设置两个参考值，使得由检测部分检测到的浮动型磁头的径向位置与这些参考值进行比较，并且将一个预设参考值与另一个参考值交替 接收到旋转停止信号时的参考值。 在另一种布置中，提供控制装置，由此浮动式磁头的滑动的径向位置在滑动区域内随机变化。 根据这些布置，由于浮动型磁头的滑动的径向位置在滑动区域内变化而不位于相同的位置，所以可以分散滑动区域内的磨损。 结果，可以延长浮动型磁头和记录介质的寿命。

    Magneto-optical recording and reading method
    9.
    发明授权
    Magneto-optical recording and reading method 失效
    磁光记录和读取方法

    公开(公告)号：US5270994A

    公开(公告)日：1993-12-14

    申请号：US931990

    申请日：1992-08-19

    申请人： Junichiro Nakayama ,  Tomoyuki Miyake ,  Hiroyuki Katayama ,  Kenji Ohta

    发明人： Junichiro Nakayama ,  Tomoyuki Miyake ,  Hiroyuki Katayama ,  Kenji Ohta

    IPC分类号： G11B11/105 ,  G11B19/02 ,  G11B7/00

    CPC分类号： G11B11/10595 ,  G11B11/10517 ,  G11B11/10523 ,  G11B11/1056 ,  G11B19/02

    摘要： A recording and reading method and device of magneto-optical memory elements are provided to record and read an information signal to and from the magneto-optical memory elements, which contain at least two magnetic layers that are magnetically coupled, by means of a light-intensity modulated overwriting method employing a recording magnetic field and an initializing magnetic field. A control feature is included for applying the initializing magnetic field to the magneto-optical memory elements at least one time between the point of time when moving the magneto-optical memory elements to a recording or reading position, finishing a reading or recording, and ascertaining the selected operation such as recording or erasing and the point of time when subsequent recording begins such that the initializing magnetic field is not applied at the same time as the recording magnetic field.

    摘要翻译： 提供磁光存储器元件的记录和读取方法和装置，用于通过发光元件记录和读取与包含至少两个磁耦合的磁层的磁光存储元件的信息信号， 采用记录磁场和初始化磁场的强度调制重写方法。 包括控制特征，用于在将磁光存储元件移动到记录或读取位置，完成读取或记录之间的时间点之间的至少一个时间将初始化磁场施加到磁光存储元件，并且确定 所选择的操作如记录或擦除以及后续记录开始的时间点，使得初始化磁场不与记录磁场同时施加。

    Optical recording element having a plurality of thin film filtering layers and optical recording element having an electrically conductive layer
    10.
    发明授权
    Optical recording element having a plurality of thin film filtering layers and optical recording element having an electrically conductive layer 失效
    具有多个薄膜滤光层的光学记录元件和具有导电层的光学记录元件

    公开(公告)号：US5214636A

    公开(公告)日：1993-05-25

    申请号：US421757

    申请日：1989-10-16

    申请人： Toshio Ishikawa ,  Hiroyuki Katayama ,  Kazuo Van ,  Tomoyuki Miyake ,  Junichiro Nakayama ,  Kenji Ohta ,  Hideyoshi Yamaoka

    发明人： Toshio Ishikawa ,  Hiroyuki Katayama ,  Kazuo Van ,  Tomoyuki Miyake ,  Junichiro Nakayama ,  Kenji Ohta ,  Hideyoshi Yamaoka

    IPC分类号： G11B7/24053 ,  G11B7/253 ,  G11B7/254

    CPC分类号： G11B7/253 ,  G11B7/24053 ,  G11B7/254

    摘要： An optical recording element according to the present invention comprising: (i) a transparent substrate through which light passes; (ii) a transparent low-resistance layer having a specific resistance so as to prevent the adhesion of dust to the surface of the element caused by a static charge, the layer being formed on the surface, on which a light beam is incident, of the transparent substrate; and (iii) an optical thin film composed of at least one layer, formed on the other surface of the transparent substrate so as to transmit light beams used for recording, erasing and playback, and reflect lights which have wavelengths different from the wavelength of the above light beams and are within a specified visible region of the spectrum. With this arrangement, lights within a specified visible region of the spectrum are reflected so that the element appears to be colored according to the wavelengths of the reflected lights. Also, a problem often found in a conventional optical recording element having a transparent substrate of a resin material that the surface of the element is hardened by a light beam, can be solved. Even if a static charge is generated on the surface of such an element, the conductive transparent low-resistance substrate can eliminate the static charge outward whereby a static charge is less likely to be accumulated and the surface can be kept clean in order to improve the reliability.

    摘要翻译： 根据本发明的光学记录元件包括：（i）光通过的透明基板; （ii）具有电阻率的透明低电阻层，以防止由静电引起的灰尘附着在元件表面上，该层形成在光束入射的表面上的层是 透明基板; 和（iii）由至少一层构成的光学薄膜，形成在透明基板的另一个表面上，以透射用于记录，擦除和重放的光束，并且反射具有与波长不同的波长的光 在光束之上，并且在光谱的指定可视区域内。 通过这种布置，光谱的指定可视区域内的光被反射，使得该元件看起来根据反射光的波长着色。 而且，通过在具有树脂材料的透明基板的光学记录元件中经常发现的问题在于，元件的表面被光束硬化。 即使在这种元件的表面上产生静电荷，导电透明低电阻基板也可以向外消除静电荷，由此静电荷不易累积，并且表面可以保持清洁以改善 可靠性。