公开(公告)号：US5353171A

公开(公告)日：1994-10-04

申请号：US920844

申请日：1992-07-28

申请人： Kayoko Suzuki ,  Ariyoshi Nakaoki ,  Yoshihiro Muto

发明人： Kayoko Suzuki ,  Ariyoshi Nakaoki ,  Yoshihiro Muto

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B5/127 ,  G11B7/00

CPC分类号： G11B11/10532 ,  G11B11/10523 ,  G11B11/10586

摘要： A magneto-optical recording apparatus records information on a magneto-optical recording medium composed of a memory layer and a recording layer which are disposed on a substrate, each comprising a magnetic thin film of amorphous-rare-earth transition-metal alloy. The memory and recording layers are magnetically coupled directly, or through an intermediate layer therebetween, to each other under an exchange force. A recording magnetic field generator such as a permanent magnet or an electromagnet applies a recording magnetic field to the magneto-optical recording medium, and an initializing magnetic field generator such as a permanent magnet or an electromagnet applies an initializing magnetic force to the magneto-optical recording medium. The initializing magnetic field generator has a magnetic pole confronting a surface of the magneto-optical recording medium. The initializing magnetic force comprises a magnetic field H.sub.V directed perpendicularly to the surface of the magneto-optical recording medium, and a magnetic field H.sub.H directed along the surface of the magneto-optical recording medium. The magnetic fields H.sub.V, H.sub.H are defined as follows:H.sub.V .ltoreq.H.sub.C2 +H.sub.W2,andH.sub.H >{(H.sub.C2 +H.sub.W2)-H.sub.V }.times.1.7where H.sub.C2 is the coercive force of the recording layer and H.sub.W2 is the exchange force.

摘要翻译： 磁光记录装置将信息记录在由设置在基板上的存储层和记录层构成的磁光记录介质上，每个磁光记录介质包括非晶 - 稀土过渡金属合金的磁性薄膜。 存储器和记录层在交换力下彼此直接磁耦合或者通过它们之间的中间层磁耦合。 诸如永磁体或电磁体的记录磁场发生器将磁记录磁场施加到磁光记录介质上，诸如永磁体或电磁体的初始化磁场产生器将磁化初始化磁力施加到磁光 记录介质。 初始化磁场发生器具有面对磁光记录介质的表面的磁极。 初始化磁力包括垂直于磁光记录介质的表面定向的磁场HV以及沿磁光记录介质的表面指向的磁场HH。 磁场HV，HH定义如下：HV {（HC2 + HW2）-HV} x1.7其中HC2是记录层的矫顽力，HW2是交换力 。

公开(公告)号：US5273835A

公开(公告)日：1993-12-28

申请号：US586874

申请日：1990-09-21

申请人： Hiroyuki Matsumoto ,  Jun Saito

发明人： Hiroyuki Matsumoto ,  Jun Saito

IPC分类号： G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10523 ,  G11B11/10506 ,  G11B11/10517 ,  G11B11/10586 ,  Y10S428/90

摘要： A magnetooptical recording medium capable of performing an over-write operation by only modulating an intensity of a light beam without modulating a direction of a bias field is known. This invention provides a multilayered medium which has an advantage of a large margin for an initial field Hini. for initializing the medium, and can stably perform an over-write operation, or which can increase a beam intensity in a reproduction mode to attain a high C/N ratio.

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。