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1.发明授权Method and apparatus for writing and reading a magneto-optical record carrier 失效用于写入和读取磁光记录载体的方法和装置
公开(公告)号：US5371721A
公开(公告)日：1994-12-06
申请号：US998898
申请日：1992-12-28
IPC分类号： G11B11/10 , G11B11/105 , G11B13/04
CPC分类号： G11B11/10528 , G11B11/10508 , G11B11/10513 , G11B11/10554
摘要： A method and apparatus for writing and reading information in the form of a pattern of magnetic domains in an information layer of a record carrier. An optical scanning beam is focused to a diffraction-limited radiation spot, and a magnetic field is generated by a coil supplied with an energizing current the amplitude of which is modulated by the information signal to be recorded. The magnetic field is thereby modulated, and produces magnetic domains in the information layer such that each domain has a variable number of sub-domains and consequently a variable magnetization ratio, as determined by the information signal. This permits recording at an information density exceeding that corresponding to the size of the radiation spot.
摘要翻译： 一种用于在记录载体的信息层中以磁畴图案的形式写入和读取信息的方法和装置。 光学扫描光束被聚焦到衍射受限的辐射光点，并且由提供有激励电流的线圈产生磁场，该激励电流的幅度由要被记录的信息信号调制。 因此磁场被调制，并且在信息层中产生磁畴，使得每个域具有可变数量的子域，并且因此由信息信号确定可变磁化比。 这允许以超过与辐射点的尺寸相对应的信息密度进行记录。
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公开(公告)号：US5442597A
公开(公告)日：1995-08-15
申请号：US166804
申请日：1993-12-14
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10508 , G11B11/10515 , G11B11/10528 , G11B11/10532
摘要： An apparatus for writing and reading a magneto-optical record carrier (1) with an increased information density are described. Information areas (4) which are smaller than the write spot (V.sub.w) supplied by a first diode laser (40) can be written by a switched magnetic field. The areas can be read with a read spot (V.sub.r) which is smaller than the write spot, which read spot is formed by radiation from, for example an assembly of a second diode laser (42) and a frequency doubler (43).
摘要翻译： 描述了一种用于以增加的信息密度写入和读取磁光记录载体（1）的装置。 可以通过开关磁场来写入小于由第一二极管激光器（40）提供的写入点（Vw）的信息区域（4）。 这些区域可以读取小于写入点的读取点（Vr），该读取点由例如第二二极管激光器（42）和倍频器（43）的组件的辐射形成。
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3.发明授权Direct over-write magneto-optical recording medium having multiple recording layers, and method of recording new information by directly overwriting pre-existing recorded information on such medium 失效具有多个记录层的直接超写磁光记录介质，以及通过直接覆盖这种介质上的已存在记录信息来记录新信息的方法
公开(公告)号：US5282095A
公开(公告)日：1994-01-25
申请号：US852477
申请日：1992-03-17
CPC分类号： G11B11/10521 , G11B11/10513 , G11B11/10584
摘要： A magneto-optical recording medium on which new information can be directly over-written over pre-existing recorded information. Such medium comprises two magneto-optical recording layers which have a difference in Curie temperature in the range of 0.degree. C. -25.degree. C. and which are separated from each other by a metal layer for the transfer of heat, such as aluminum. Recording is effected by scanning the medium with a write spot produced by a pulsed laser beam concurrently with application of an external magnetic field which is modulated in accordance with the information to be recorded. The layers may have equal Curie temperatures if they behave thermally asymmetrically. At any scanning position of the write spot the scanned superposed local areas of the two recording layers are heated thereby above the Curie temperature of at least one of such layers and then permitted to cool while being subjected to the external magnetic field. This produces a frozen-in net magnetization in the scanned local area of one of the recording layers, which aids the external magnetic field in producing a similar frozen-in net magnetization of the superposed local area in the other recording layer. This allows use of a relatively weak external magnetic field, which is more economical and capable of operation at higher frequencies. Any pre-existing magnetization of the latter superposed local area is erased in consequence of magnetization thereof in accordance with the external magnetic field.
摘要翻译： 一种磁光记录介质，新信息可以直接在预先存在的记录信息上重写。 这种介质包括两个磁光记录层，其居里温度差在0摄氏度-25摄氏度的范围内，并且通过用于传热的金属层（例如铝）彼此分离。 通过使用由脉冲激光束产生的写入点扫描介质来实现记录，同时施加根据要记录的信息调制的外部磁场。 如果它们的行为不对称，这些层可以具有相等的居里温度。 在写入点的任何扫描位置，两个记录层的扫描的叠置的局部区域被加热到高于这些层中的至少一个的居里温度，然后允许在受到外部磁场的同时冷却。 这在记录层之一的扫描的局部区域中产生冻结的净磁化，这有助于外部磁场产生另一记录层中叠加的局部区域的类似的冻结净磁化。 这允许使用相对较弱的外部磁场，其更经济并且能够在较高频率下操作。 后一叠加局部区域的任何预先存在的磁化由于根据外部磁场的磁化而被擦除。
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4.发明授权Method of and device for recording information on a record carrier having a recording layer which, when heated, undergoes an optically detectable change 失效用于在具有记录层的记录载体上记录信息的方法和装置，所述记录层在加热时经历可光学检测的变化
公开(公告)号：US5321682A
公开(公告)日：1994-06-14
申请号：US973443
申请日：1992-11-09
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/125 , G11B11/10 , G11B11/105 , G11B21/10
CPC分类号： G11B7/126 , G11B11/10506 , G11B11/10595 , G11B7/0045
摘要： Method of and device for recording information on a record carrier having a recording layer by scanning the recording layer with a radiation beam whose power has a pulsatory variation, including radiation pulses of high power, each having decreasing power, relative to and alternating with radiation intervals of low power, each having increasing power. As a result of the heat produced by the radiation pulses, the recording layer undergoes an optically detectable change. A write signal generating circuit converts an information signal into a write signal having a pulsatory pattern, including pulses of high signal values relative to and alternating with intervals of low signal values. A control circuit sets the power of the radiation beam to values fixed by the signal values of the write signal. The signal values of each of the pulses of the write signal decrease and the signal values of each of the intervals of the write signal increase. As a result, the power of the radiation beam decreases during the radiation pulses and increases during the radiation intervals, and the influence exerted by previous radiation pulses on the temperature at the scanning area is taken into account.
摘要翻译： 通过用功率具有脉动变化的辐射束扫描记录层来记录信息的方法和装置，该辐射束具有脉动变化，包括相对于辐射间隔和与辐射间隔交替的功率降低的大功率辐射脉冲 低功率，功率增加。 由于辐射脉冲产生的热量，记录层经历可光学检测的变化。 写信号产生电路将信息信号转换为具有脉动模式的写入信号，该脉冲模式包括相对于低信号值的间隔并且与低信号值的间隔交替的高信号值的脉冲。 控制电路将辐射束的功率设置为由写入信号的信号值固定的值。 写入信号的每个脉冲的信号值减小，并且写入信号的每个间隔的信号值增加。 结果，辐射束的功率在辐射脉冲期间减小并且在辐射间隔期间增加，并且考虑到先前辐射脉冲对扫描区域温度的影响。
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公开(公告)号：US5307328A
公开(公告)日：1994-04-26
申请号：US950107
申请日：1992-09-23
申请人： Bernardus A. J. Jacobs , Petrus A. M. Van Grinsven , Wilfred A. M. Snijders , Johannes H. M. Spruit
发明人： Bernardus A. J. Jacobs , Petrus A. M. Van Grinsven , Wilfred A. M. Snijders , Johannes H. M. Spruit
IPC分类号： G11B5/02 , G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10554 , G11B11/10532
摘要： A device for writing, reading or erasing a record carrier has a coil with a winding arranged between an objective lens and the record carrier. Optical radiation is focused to a spot, the converging beam passing through the coil opening. A core of a transparent material, having an index of refraction which significantly decreases vergence of the focused beam, is placed in the winding opening. As a result the diameter of the coil can be reduced, and permit increase of the generated magnetic field.
摘要翻译： 用于写入，读取或擦除记录载体的装置具有设置在物镜和记录载体之间的缠绕线圈。 光辐射被聚焦到一个点，会聚光束通过线圈开口。 将透明材料的芯体放置在卷绕开口中，折射率明显降低聚焦光束的聚集度。 结果，线圈的直径可以减小，并且允许增加所产生的磁场。
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6.发明授权
公开(公告)号：US5065377A
公开(公告)日：1991-11-12
申请号：US453639
申请日：1989-12-20
IPC分类号： G11B11/10 , G11B11/105
CPC分类号： G11B11/10513 , G11B11/10508 , G11B11/10528
摘要： A method and apparatus for optically writing and reading information as a pattern of magnetic domains in the information recording layer of a record carrier. An optical scanning beam is focused to a diffraction-limited radiation spot for scanning the recording layer, and the region under the spot is subjected to a magnetic field generated by a magnetizing coil energized with a square-wave energizing current having a duty cycle which is modulated in accordance with the information signal. The frequency and amplitude of the energizing current are independent of the information signal, and the frequency thereof exceeds the optical cut-off frequency determined by the size of the radiation spot. Several different values of the information signal can therefore be recorded within a distance equal to the width of the radiation spot in the scanning direction at each position thereof, so that the recorded information density exceeds that corresponding the width of the scanning spot. Read-out is based on the "grey" level produced by the recorded information areas under the scanning spot at each position thereof, so that the same size scanning spot can be used for both writing and reading the record carrier.
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7.发明授权Magneto-optical record carrier with recording track structure suited for high density recording 失效具有适用于高密度记录的记录轨道结构的磁光记录载体
公开(公告)号：US5553038A
公开(公告)日：1996-09-03
申请号：US488537
申请日：1995-06-07
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10508 , G11B11/10515 , G11B11/10528 , G11B11/10532
摘要： A magneto-optical record carrier having a recording track structure which enables recording with an increased information density. Information areas which are smaller than the write spot supplied by a first diode laser can be written by means of a switched magnetic field. The areas can then be read with a read spot which is smaller than the write spot, which read spot is formed by radiation from, for example, the combination of a second diode laser and a frequency doubler. The width of the recording tracks determines the width of the information areas recorded thereon.
摘要翻译： 具有能够以增加的信息密度进行记录的记录轨道结构的磁光记录载体。 可以通过开关磁场来写入小于由第一二极管激光器提供的写入点的信息区域。 然后可以用小于写入点的读取点读取这些区域，该读取点由例如第二二极管激光器和倍频器的组合的辐射形成。 记录轨道的宽度决定其上记录的信息区域的宽度。
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8.发明授权Method of recording information on a record carrier of the thermomagnetic type, and device for carrying out the method 失效在热磁型记录载体上记录信息的方法，以及用于执行该方法的装置
公开(公告)号：US5126985A
公开(公告)日：1992-06-30
申请号：US702150
申请日：1991-05-14
申请人： Johannes H. M. Spruit , Hendricus F. J. J. Van Tongeren , Piet F. Bongers , Bernardus A. J. Jacobs
发明人： Johannes H. M. Spruit , Hendricus F. J. J. Van Tongeren , Piet F. Bongers , Bernardus A. J. Jacobs
IPC分类号： G11B5/02 , G11B11/10 , G11B11/105 , G11B13/04
CPC分类号： G11B11/1053 , G11B11/10513 , G11B13/045
摘要： When information is recorded on a record carrier (1) of the thermomagnetic type, the thermomagnetic recording layer (4) is scanned by a magnetic field generated by a magnetic-field modulator (7). The magnetic field is modulated depending on an information signal (Vi). Moreover, the scanned portion of the record carrier (1) is at the same time locally heated by radiation pulses (10) generated by an optical scanning device (5). By means of radiation pulses (10) the record carrier is heated above a write temperature (Ts), above which temperature the magnetization of the record carrier assumes the direction dictated by the magnetic field. A synchronizing circuit (9) generates the control signal (Vm) for modulating the magnetic field and the control signal (Vr) for generating the radiation pulses, in such a way that at the end of the radiation pulses the field strength is sufficiently high for the heated area of the record carrier to be magnetized in the directio dictated by the magnetic field.
摘要翻译： 当信息被记录在热磁型的记录载体（1）上时，热磁记录层（4）被磁场调制器（7）产生的磁场扫描。 根据信息信号（Vi）来调制磁场。 此外，由光学扫描装置（5）产生的辐射脉冲（10）局部地加热记录载体（1）的扫描部分。 通过辐射脉冲（10），记录载体被加热到高于写入温度（Ts），高于该温度，记录载体的磁化取决于由磁场决定的方向。 同步电路（9）产生用于调制磁场的控制信号（Vm）和用于产生辐射脉冲的控制信号（Vr），使得在辐射脉冲结束时，场强足够高， 由磁场决定的要被磁化的记录载体的加热区域。
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公开(公告)号：US5014254A
公开(公告)日：1991-05-07
申请号：US285184
申请日：1988-12-15
IPC分类号： G11B11/10 , G11B11/105
CPC分类号： G11B11/10521 , G11B11/10513 , G11B11/1053 , G11B11/10536 , G11B11/10554 , G11B11/10576
摘要： A method and apparatus are revealed for recording information on a record carrier (1) having a magneto-optical recording layer (2), a pattern of magnetic domains (23, 24) having a first and a second direction of magnetization being formed in the recording layer (2). In accordance with the method, areas (22) of the recording layer are heated by the radiation pulses (20). The heated areas (22) are magnetized by means of a coil (12) which is energized with energizing-current pulses (21) which lag the radiation pulses (20) to such an extent that cooling of the areas (22) takes place substantially during the generation of the energizing pulses (12).
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10.发明授权Record carrier with an optically readable radiation-reflecting information structure 失效具有光学可读的辐射反射信息结构的记录载体
公开(公告)号：US4230915A
公开(公告)日：1980-10-28
申请号：US972754
申请日：1978-12-26
申请人： Jan G. Dil , Bernardus A. J. Jacobs
发明人： Jan G. Dil , Bernardus A. J. Jacobs
摘要： A record carrier is described having an optically readable radiation-reflecting information structure, which comprises trackwise arranged information areas which, in the track direction and transverse to the track direction, are spaced from each other by intermediate areas. It is demonstrated that if the angle of inclination between the walls of the first areas and the normal to the record carrier has one value between 30.degree. and 65.degree. for a satisfactorily reproducible record carrier, the geometrical distance between the plane of the information areas and the plane of the intermediate areas should have one value between (165/N) nanometers and (270/N) nanometers, N being the refractive index of a transparent medium which is disposed between the first and the second plane.
摘要翻译： 描述了具有光学可读的辐射反射信息结构的记录载体，其包括在轨道方向上并且横向于轨道方向彼此间隔的中间区域的跟踪布置的信息区域。 证明如果令人满意地重现的记录载体，如果第一区域的壁和记录载体的法线之间的倾斜角在30°和65°之间具有一个值，则信息区域的平面与 中间区域的平面应该具有（165 / N）纳米和（270 / N）纳米之间的一个值，N是设置在第一和第二平面之间的透明介质的折射率。
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