公开(公告)号：US5499227A

公开(公告)日：1996-03-12

申请号：US275791

申请日：1994-07-15

申请人： Masashi Higasa

发明人： Masashi Higasa

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10

CPC分类号： G11B7/126 ,  G11B11/1053 ,  G11B20/10194 ,  G11B7/0045 ,  G11B7/005

摘要： A recording pulse circuit first divides a recording pulse into multiple pulses in accordance with a recording reference clock signal to generate a short-pulse group. The recording pulse circuit then connects a preset number of pulses of the short-pulse group beginning with a top one of the pulses of the short-pulse group to form a top long pulse. Finally, the recording pulse circuit shifts the positions of the front edge and the rear edge of the top long pulse by a designated time, and outputs the shifted top long pulse and the following pulses of the short-pulse group as recording pulses to a semiconductor laser drive circuit.

摘要翻译： 记录脉冲电路首先根据记录参考时钟信号将记录脉冲分成多个脉冲以产生短脉冲组。 记录脉冲电路然后连接短脉冲组的预设数量的脉冲，从短脉冲组的脉冲的顶部开始，形成顶部的长脉冲。 最后，记录脉冲电路将顶部长脉冲的前沿和后沿的位置移动指定时间，并将短脉冲组的移位的顶部长脉冲和随后的脉冲作为记录脉冲输出到半导体 激光驱动电路。

公开(公告)号：US5487059A

公开(公告)日：1996-01-23

申请号：US137967

申请日：1993-10-19

申请人： Jun Saito ,  Shinichi Kurita

发明人： Jun Saito ,  Shinichi Kurita

IPC分类号： G11B7/125 ,  G11B11/105 ,  G11B11/12 ,  G11B13/04

CPC分类号： G11B7/126 ,  G11B11/10506 ,  G11B11/1053 ,  G11B11/10595

摘要： In an optical recording method and apparatus, the intensity of a laser beam to be radiated onto a magnetooptical recording medium is raised from an intensity P.sub.pre for maintaining a pre-heat state, in which the temperature on the medium surface has a predetermined temperature .THETA..sub.pre, to an intensity P.sub.W1 higher than P.sub.pre so as to form a mark on the medium, the intensity is reduced to an intensity P.sub.LB lower than P.sub.pre, and after an elapse of a time T.sub.off, the intensity is raised to P.sub.pre. At least one of P.sub.pre, T.sub.off, and P.sub.LB is controlled to achieve the pre-heat state within a time period until the intensity is raised to P.sub.W1 again to form the next mark.

摘要翻译： 在光记录方法和装置中，将辐射到磁光记录介质上的激光束的强度从用于维持预热状态的强度Ppre升高，其中介质表面上的温度具有预定温度THETA pre 对于高于Ppre的强度PW1，以便在介质上形成标记，强度降低到低于Ppre的强度PLB，并且在经过时间Toff之后，将强度提高到Ppre。 控制Ppre，Toff和PLB中的至少一个以在一段时间内实现预热状态，直到强度再次升高到PW1以形成下一个标记。

公开(公告)号：US5412626A

公开(公告)日：1995-05-02

申请号：US36198

申请日：1993-03-23

申请人： Eiji Ohno ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Noboru Yamada ,  Nobuo Akahira

发明人： Eiji Ohno ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Noboru Yamada ,  Nobuo Akahira

IPC分类号： G11B7/0045 ,  G11B7/006 ,  G11B7/125 ,  G11B11/105 ,  G11B11/00 ,  G11B7/00

CPC分类号： G11B7/126 ,  G11B11/10521 ,  G11B11/1053 ,  G11B11/10595 ,  G11B7/0045 ,  G11B7/006

摘要： In a method of recording optical information, one of correcting ways for correcting the pulse waveform of the input signal to be recorded is selected depending on change in relative velocity between the optical information recording medium and the laser beam spot; and thereafter the laser beam output power is modulated in a range between an erasing level and a recording level in accordance with the corrected pulse waveform of the modulated input signal. Then a digital input signal corrected by modulation in pulse width is overwritten onto an optical information recording medium with a single laser beam spot by forming recording marks corresponding to the input pulse signal.

摘要翻译： 在记录光学信息的方法中，根据光学信息记录介质和激光束点之间的相对速度的变化来选择用于校正要记录的输入信号的脉冲波形的校正方法之一; 之后根据调制输入信号的校正脉冲波形将激光束输出功率调制在擦除电平和记录电平之间的范围内。 然后通过形成与输入脉冲信号相对应的记录标记，通过脉冲宽度调制校正的数字输入信号被重写到具有单个激光束点的光学信息记录介质上。

公开(公告)号：US5345434A

公开(公告)日：1994-09-06

申请号：US144608

申请日：1993-11-01

申请人： Hiroshi Ide ,  Takeshi Maeda

发明人： Hiroshi Ide ,  Takeshi Maeda

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18

CPC分类号： G11B7/0045 ,  G11B11/1053 ,  G11B11/10595 ,  G11B20/10009 ,  G11B20/10212 ,  G11B20/1816 ,  G11B7/126 ,  G11B7/24085 ,  G11B11/10506 ,  G11B20/1258

摘要： In a data recording operation, various patterns each having n edge widths (n is an integer), which are considered to appear in the operation, are predicted such that a record pattern sequence including the various patterns is recorded before an actual data recording operation. Using a read-out signal thereof, a shift quantity of each edge of the read-out signal with respect to an inherent edge record position is attained, thereby generating a table containing relationships between the respective patterns and the edge shift quantities. During an actual data recording operation, a record signal of the data is collated in a unit of the n edge widths with the patterns stored in the table so as to correct the edge width.

摘要翻译： 在数据记录操作中，预测出在操作中被认为出现的n个边缘宽度（n是整数）的各种图案，使得在实际数据记录操作之前记录包括各种图案的记录图案序列。 使用其读出信号，获得读出信号相对于固有边缘记录位置的每个边缘的偏移量，从而生成包含各个图案和边缘移位量之间的关系的表格。 在实际的数据记录操作期间，将数据的记录信号以n个边缘宽度为单位与图表中存储的图案进行整理，以校正边缘宽度。

公开(公告)号：US5331612A

公开(公告)日：1994-07-19

申请号：US922854

申请日：1992-07-31

申请人： Yoshiteru Murakami ,  Kenji Ohta ,  Akira Takahashi

发明人： Yoshiteru Murakami ,  Kenji Ohta ,  Akira Takahashi

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B13/04

CPC分类号： G11B11/10521 ,  G11B11/10508 ,  G11B11/1051 ,  G11B11/10528 ,  G11B11/1053 ,  G11B11/10595

摘要： A magneto-optical recording apparatus which records information through the processes of: first irradiating a light beam onto a magneto-optical recording medium having a recording film; and next applying an external magnetic field that is inverted in response to a recording signal onto the recording film while continuing the first process. In the above arrangement, the intensity of the light beam is dropped upon inversion of the external magnetic field so that information is not recorded. The intensity of the light beam is raised during non-inversion of the external magnetic field so that information is recorded. Further the magneto-optical recording apparatus is provided with a light intensity control device for varying the intensity of the light beam dependent of the lengths of recording bits so that the high-temperature area of the recording film is not widened. Since the width of the recording bits is uniformly maintained, the remaining of the recording bit after overwriting operation can be reduced; thus, the signal quality in reproduction can be enhanced.

摘要翻译： 一种磁光记录装置，其通过以下处理记录信息：首先将光束照射到具有记录膜的磁光记录介质上; 并且接着在继续进行第一处理的同时将响应于记录信号反转的外部磁场施加到记录膜上。 在上述布置中，光束的强度在外部磁场反转时下降，从而不记录信息。 在外部磁场的非反相期间，光束的强度升高，从而记录信息。 此外，磁光记录装置设置有光强度控制装置，用于根据记录位的长度改变光束的强度，使得记录膜的高温区域不会变宽。 由于记录位的宽度被均匀地保持，所以可以减少重写操作之后的记录位的剩余部分。 因此，可以提高再现中的信号质量。

公开(公告)号：US5323374A

公开(公告)日：1994-06-21

申请号：US11258

申请日：1993-01-29

申请人： Masayuki Arai ,  Hideo Owa

发明人： Masayuki Arai ,  Hideo Owa

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B13/04 ,  G11B13/00

CPC分类号： G11B11/10521 ,  G11B11/10506 ,  G11B11/1053

摘要： After a laser beam of a high-level laser beam is applied to a multilayer magneto-optical recording medium to record information thereon, a laser beam of a laser power lower than the laser power of a reading laser beam is applied or substantially no laser beam is applied for a period of time .tau..sub.0. If one channel clock period or the period in which the high-level laser beam is of the second laser power is applied is .tau..sub.w, then the ratio R=(.tau..sub.0 /.tau..sub.w).times.100 is selected to be in the range from 15 to 70%.

摘要翻译： 在将高级激光束的激光束施加到多层磁光记录介质上以在其上记录信息之后，施加低于读取激光束的激光功率的激光功率的激光束，或者基本上没有激光束 施加一段时间τ0。如果施加一个通道时钟周期或高电平激光束处于第二激光功率的周期，则τw为比率R =（τ0 /τw） x100选择在15至70％的范围内。

公开(公告)号：US5305297A

公开(公告)日：1994-04-19

申请号：US668478

申请日：1991-03-13

申请人： Kenichi Nishiuchi ,  Eiji Ohno ,  Noboru Yamada ,  Nobuo Akahira

发明人： Kenichi Nishiuchi ,  Eiji Ohno ,  Noboru Yamada ,  Nobuo Akahira

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B7/26 ,  G11B7/30 ,  G11B11/105 ,  G11B27/36

CPC分类号： G11B7/126 ,  G11B27/36 ,  G11B7/00455 ,  G11B7/24085 ,  G11B11/1053 ,  G11B11/10595

摘要： Before a signal is recorded on an optical disk, irradiations are made with plural light irradiation conditions of variable irradiation power or pulse width, optical conditions of irradiated portions are detected by detecting changes in the reflectivity or transmissivity or errors, and the optimum irradiation conditions are determined by comparing the detected results and the light irradiation conditions. In particular, by determining the optimum irradiation conditions in reference to the point where the change in reflectivity or transmissivity is greatest with respect to changes in the irradiation power, the optimum light irradiation conditions can be determined in a short time.

摘要翻译： 在信号记录在光盘上之前，以可变照射功率或脉冲宽度的多个照射条件进行照射，通过检测反射率或透射率或误差的变化来检测照射部分的光学条件，最佳照射条件为 通过比较检测结果和光照条件来确定。 特别地，通过相对于照射功率的变化，反射率或透射率的变化最大的点来确定最佳的照射条件，可以在短时间内确定最佳光照射条件。

公开(公告)号：US5235590A

公开(公告)日：1993-08-10

申请号：US851537

申请日：1992-03-13

申请人： Masakazu Taguchi ,  Akio Futamata ,  Masaharu Moritsugu ,  Haruhiko Izumi

发明人： Masakazu Taguchi ,  Akio Futamata ,  Masaharu Moritsugu ,  Haruhiko Izumi

IPC分类号： G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14

CPC分类号： G11B20/10222 ,  G11B11/10515 ,  G11B11/1053 ,  G11B11/10597 ,  G11B20/10009 ,  G11B20/1217 ,  G11B20/1426 ,  G11B2220/2525

摘要： A read out apparatus reads out prerecorded information from a magneto-optic disk by detecting intervals of edges of magnetic domains formed on the magneto-optic disk with different directions of magnetization, where the intervals of the edges of the magnetic domains correspond to data "1"s or "0""1"s of the prerecorded information. The read out apparatus includes a first part for producing a read out signal by scanning the magnetic domains of the magneto-optic disk, a second part for producing an edge detection signal which has rising and falling edges depending on leading and trailing edges of the magnetic domains, and for corecting edge positions of the edge detection signal based on predetermined information, a third part including a phase locked loop circuit for producing a clock signal which is synchronized to the rising and falling edges of the edge detection signal, and a fourth part for separating the data from the edge detection signal output from the second part using the clock signal output from the third part.

公开(公告)号：US5218591A

公开(公告)日：1993-06-08

申请号：US725277

申请日：1991-07-03

申请人： Masayoshi Shimamoto ,  Kunimaro Tanaka ,  Isao Watanabe ,  Osamu Ito

发明人： Masayoshi Shimamoto ,  Kunimaro Tanaka ,  Isao Watanabe ,  Osamu Ito

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10

CPC分类号： G11B7/126 ,  G11B11/10528 ,  G11B11/1053 ,  G11B11/10595 ,  G11B20/10194 ,  G11B7/0045 ,  G11B7/00451 ,  G11B7/125 ,  G11B7/24085 ,  G11B11/10506

摘要： In an optical disk apparatus for recording information in pits formed on an optical disk by projecting a light beam onto the optical disk and heating an area of the optical disk corresponding to the pulse pattern of the information, the pulse pattern of the information to be recorded is discriminated, and on the basis of the discriminated pulse pattern, the timing to start on and end the emission of the light beam from the light source to the optical disk is modified, or the number of emissions and the duration of each emission is controlled so that the pattern of the pits are corrected to the shapes that ensure accurate regeneration of the information.

摘要翻译： 在光盘装置中，通过将光束投射到光盘上并且对与信息的脉冲图案对应的光盘的区域进行加热来记录在光盘上形成的凹坑中的信息，记录的信息的脉冲图案 并且基于所识别的脉冲图案，改变开始并结束从光源到光盘的光束发射的定时，或者控制发射的数量和每个发射的持续时间 使得凹坑的图案被校正为确保信息的准确再生的形状。

公开(公告)号：US5020040A

公开(公告)日：1991-05-28

申请号：US65931

申请日：1987-06-24

申请人： Neville K. Lee

发明人： Neville K. Lee

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10506 ,  G11B11/10521 ,  G11B11/1053

摘要： Modulating the intensity of directed energy for thermal writing of memory cells overwrites bits of either state in a storage layer of magnetic material irrespective of the preexisting condition of the cell without employing a magnetic field whose origin is external to the storage layer. Directed energy is synchronized with the medium by superimposing, preferably nonmagnetically, self-timing information on the medium itself and synchronously recovering the self-timing information to assist in directing energy to the medium. The medium itself has a magnetic layer plus recoverable timing information fixed in the medium along a predetermined path preferably embodied in a fixed periodic uniform variation in the nonmagnetic reflection properties along the track.