专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2005158262A Optical disk device and recording medium 审中-公开
标题翻译：光盘设备和记录介质
公开(公告)号：JP2005158262A
公开(公告)日：2005-06-16
申请号：JP2005062647
申请日：2005-03-07
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MAEDA TAKESHI , TSUCHINAGA HIROYUKI , NAKAMURA SHIGERU , SUKETA YASUSHI , SUGIYAMA HISATAKA , SHIGEMATSU KAZUO
IPC分类号： G11B11/105
摘要： PROBLEM TO BE SOLVED: To realize a light intensity modulation magneto-optical disk device having a capacity of 2.6 GB or more on one medium surface of a diameter 130 mm by expanding a recording area and using a format having a bit pitch of 0.42 μm or more, and a track pitch of 0.9 μm or less, and by optimizing a land part recording medium and a recording waveform and a trial writing pattern, learning an equalizing coefficient, and using a slice matching system.
SOLUTION: In the recording medium, recording is carried out on its land part by expanding a recording area and using the format having the bit pitch of 0.42 μm or more and the track pitch of 0.9 μm or less. In the magneto-optical disk device, a recording waveform and a trial writing pattern are optimized, an equalizing coefficient is learned, and slices are matched.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：通过扩展记录区域并使用具有位节距的格式来实现在直径为130mm的一个介质表面上具有2.6GB或更大容量的光强度调制磁光盘装置 0.42μm以上，轨迹间距为0.9μm以下，通过优化陆部记录介质，记录波形和试写图案，学习均匀系数，使用切片匹配系统。解决方案：在记录介质中，通过扩展记录区域并使用比特间距为0.42μm以上，轨迹间距为0.9μm以下的格式，在其陆地部分上进行记录。在磁光盘装置中，对记录波形和试写图案进行了优化，得到了均衡系数，切片匹配。版权所有（C）2005，JPO＆NCIPI

2. 发明专利

JP2004235925A Error correction method, error correction circuit, and information recording and reproducing device 审中-公开
公开(公告)号：JP2004235925A
公开(公告)日：2004-08-19
申请号：JP2003021458
申请日：2003-01-30
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TSUCHINAGA HIROYUKI
IPC分类号： G06F11/10 , G11B5/09 , G11B20/10 , G11B20/18 , H03M13/09 , H04L1/00
CPC分类号： H03M13/09 , G11B20/10009 , G11B20/18 , G11B20/1833
摘要： PROBLEM TO BE SOLVED: To realize a CRCC correction processing for double event errors in a smaller circuit scale than that of a conventional technique while allowing inaccuracy of missing flags.
SOLUTION: A double event error having a high frequency in occurrence out of double event errors is taken as a correction object, and CRC data at the time of the occurrence of a limited error event in an arbitrary bit position of reproduced data are successively calculated by cyclic substitution, and a calculation result is exclusively added to CRC data of reproduced data to virtually correct one event error in the first position temporarily, and CRC data after temporal correction are calculated to detect one event error in the second position, and one event error in the first position after temporal correction and that in the second position are corrected.
COPYRIGHT: (C)2004,JPO&NCIPI

3. 发明专利

JP2003233954A METHOD AND CIRCUIT FOR DECODING DATA, AND INFORMATION RECORDING AND REPRODUCING DEVICE USING THE SAME 审中-公开
公开(公告)号：JP2003233954A
公开(公告)日：2003-08-22
申请号：JP2002031860
申请日：2002-02-08
申请人： HITACHI LTD
发明人： SAWAGUCHI HIDEKI , NISHIDA YASUTAKA , MOCHIZUKI MASABUMI , TSUCHINAGA HIROYUKI
IPC分类号： G11B5/012 , G11B5/09 , G11B20/14 , G11B20/18 , H03M13/45
摘要： PROBLEM TO BE SOLVED: To enable a PRML signal processing system to decrease data decoding error event due to medium noise generated depending upon a recording code pattern by a simple means. SOLUTION: For a result of PRML data decoding, a code error phenomenon of high occurrence frequency depending upon a signal distance is noticed to examine its occurrence probability. At this time, a localized medium noise quantity is estimated from successive code patterns of the PRML decoding result and the occurrence probability of the error event is corrected to increase detection precision, thereby realizing data demodulation of high precision by a simple circuit means through conventional most likelihood decoding. COPYRIGHT: (C)2003,JPO

4. 发明专利

JPH09251676A OPTICAL DISK DEVICE AND RECORDING MEDIUM 失效
公开(公告)号：JPH09251676A
公开(公告)日：1997-09-22
申请号：JP5576196
申请日：1996-03-13
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , TSUCHINAGA HIROYUKI , NAKAMURA SHIGERU , SUKETA YASUSHI , SUGIYAMA HISATAKA , SHIGEMATSU KAZUO
IPC分类号： G11B11/10 , G11B11/105 , G11B20/10
摘要： PROBLEM TO BE SOLVED: To increase a storage capacity as much as more than twice by generating a pulse at the cross point between a slice level and a detection signal and generating a clock by this pulse. SOLUTION: A magneto-optical signal passes through an equalization coefft. setting circuit 201 to be inputted to a level matching circuit 202 and is inputted to level slicing circuits 203, 204, 205 after being added with a prescribed level. In the circuit 203, a pulse is generated at the cross point between the slice level at the center of a reproduced signal and a detection signal to be inputted to a clock generating circuit 207, which generates a reproducing clock. Moreover, pulses are generated at cross points among other slice levels and the detection signal and phase differences among these pulses and the clock are measured. Then, when a phase deviation exceeds a specified value, a pulse is transmitted and then the slice level is shifted by a specified amount in accordance with the pulse transition and further the phase of a clock for data discrimination is shifted.

5. 发明专利

JPH0831092A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0831092A
公开(公告)日：1996-02-02
申请号：JP16766994
申请日：1994-07-20
申请人： HITACHI LTD
发明人： SAGA HIDEKI , TSUCHINAGA HIROYUKI , SUKETA YASUSHI
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/005 , G11B7/007 , G11B7/013 , G11B7/09 , G11B7/125 , G11B7/126 , G11B7/24 , G11B11/105 , G11B20/10 , G11B20/12 , G11B20/14
摘要： PURPOSE:To construct a system of >=600MB/surface in both application data and user data areas in total by applying a high precision recording control technology and highly reliable reproducing technology by the PR class 1 system to the optical disk device for 3.5 in. size optical disk in coexistence of RAM and ROM. CONSTITUTION:Unser data 201 is recorded in a RAM area on the optical disk 100 with high accuracy by a recording processing system 106 consisting of an 8/9 modulation coder 211 and a recording wave generator 212. At the time of reproducing, data of the RAM/ROM area is detected by a reproducing processing system 105, and is demodulated into the user data 202.

6. 发明专利

JPH0729239A RECORDING CONTROL METHOD FOR MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPH0729239A
公开(公告)日：1995-01-31
申请号：JP17435793
申请日：1993-07-14
申请人： HITACHI LTD
发明人： TODA TAKESHI , IDE HIROSHI , KIRINO FUMIYOSHI , MAEDA TAKESHI , TSUCHINAGA HIROYUKI , KAKU TOSHIMITSU , MITA SEIICHI , SHIGEMATSU KAZUO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To provide the recording control method for magneto-optical disks capable of easily enhancing accuracy by utilizing a mark length recording system. CONSTITUTION:Recording by the prescribed level corresponding to a recording code signal string 20 is executed by superposing plural kinds of square waves of the period length of integer times (1/2)T + or - uniform regulation pulse length on the reproducing level Pr of a laser beam output of a specified low level in synchronization with a clock 30, where the period thereof is defined as T, and controlling the laser beam output in the following manner. Namely, the laser beam output is composed of the square wave pulses of at least >=1 kinds of the period lengths described above of the high recording level Pw in the recording code period and the level is lowered down to the reproducing level Pr and is held for the period of integer times (1/2) T and is then held at the low recording level Pas in the heat period of the recording codes. The number of the pulse trains and the holding time are changed according to the duration of the recording code period and the halt period.

7. 发明专利

JPH0721614A ERASING METHOD FOR MAGNETO-OPTICAL RECORDING 失效
公开(公告)号：JPH0721614A
公开(公告)日：1995-01-24
申请号：JP16772493
申请日：1993-07-07
申请人： HITACHI LTD
发明人： KIRINO FUMIYOSHI , TODA TAKESHI , IDE HIROSHI , TSUCHINAGA HIROYUKI , MAEDA TAKESHI , KUGIYA FUMIO
IPC分类号： G11B7/125 , G11B11/10 , G11B11/105
摘要： PURPOSE:To lower the maximum temp. of a recording film and to realize a high- density optical recording by increasing the wavelength of light or deviating a focus or reducing an aperture ratio of a lens at the time of erasing recorded information. CONSTITUTION:A optical head 102 converges the light of a laser 108 to a medium 101. The input information is outputted from the laser 108 through a recording generator 105 and an APC 106 at the time of recording. The reflected light from the medium 101 is outputted through a photodetector 109 and an amplifier 110 to a waveform equalizer 111 and an input switch 112 at the time of reproducing the information. Output pulses are introduced to a discriminator 115 and a PLL 114 and the information is outputted from a decoder 117. A comparing discriminator 116 outputs the information of a trial writer 103 to a coder 104 and an input switch 112 switches the output of the amplifier 110 to a waveform shaper 113. The information from the coder 104 and the diacriminator 115 is compared and a trial writing end signal is emitted when the difference decreases to a permissible range. The change in the fluctuation in the sensitivity of the disk, etc., with the lapse of time according to the repetition of recording/erasing is suppressed by this constitution. The control of the shapes of the recording magnetic domains with high accuracy is thus made possible.

8. 发明专利

JPH0684224A RECORDING CONTROL METHOD FOR MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPH0684224A
公开(公告)日：1994-03-25
申请号：JP23827692
申请日：1992-09-07
申请人： HITACHI LTD
发明人： TODA TAKESHI , IDE HIROSHI , KIRINO FUMIYOSHI , MAEDA TAKESHI , TSUCHINAGA HIROYUKI , KAKU TOSHIMITSU , MITA SEIICHI , SHIGEMATSU KAZUO
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/0055 , G11B7/006 , G11B7/125 , G11B7/126 , G11B11/10 , G11B11/105
摘要： PURPOSE:To provide a recording control method for a magneto-optical disk which can easily improve accuracy by utilizing a mark length recording system. CONSTITUTION:Corresponding to a recording code sequence 20, recording is performed onto the reproducing level Pr of a laser beam output at a fixed low level while controlling the laser beam output synchronously with a clock 30 by superimposing the plural kinds of rectangular waves having the integer multiple of (1/2) T, when the cycle is defined as T, of a period length. Namely, the recording code period of the recording code sequence 20 is composed of a pulse sequence composed of one or more kinds of rectangular wave pulses in the integer multiple of (1/2) T which rises or falls synchronously with the clock 30 and reaches an area Pw at a recording level at least. In the standstill period between recording codes, the pulse falls down to the low level of the reproducing level Pr synchronously with the clock 30 and after it is held for the integer-multiple period of (1/2) T, the level is held at a preheat level Ph or an erasing level Per until the next rising time point of the recording code. Corresponding to the length of the recording code period or standstill period, the number of pulse sequences in the area Pw or the length of the holding time can be changed.

9. 发明专利

JPH0612715A MAGNETO-OPTICAL RECORDING MEDIUM AND RECORDING, REPRODUCING OR ERASING METHOD AND DEVICE USING THIS MEDIUM 失效
公开(公告)号：JPH0612715A
公开(公告)日：1994-01-21
申请号：JP17039392
申请日：1992-06-29
申请人： HITACHI LTD
发明人： KIRINO FUMIYOSHI , MAEDA TAKESHI , TODA TAKESHI , IDE HIROSHI , TSUCHINAGA HIROYUKI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To enable the formation of desired magnetic domain shapes and micro- magnetic domains with high accuracy by providing a heat flow control layer and thermal diffusion layer for controlling heat flow and obtaining the balance of the heat flow to be applied to a recording film by these layers. CONSTITUTION:A silicon nitride layer is formed as an inorg. dielectric layer 2 on a glass or plastic substrate 1 on which rugged guide grooves or guide pits are formed. A TbFeCoTa film in then formed as a magneto-optical recording film layer 3. A silicon oxide layer which is an inorg. dielectric material is thereafter formed as the heat flow control layer 4. Finally, an AuTi film is formed as the thermal diffusion layer 5, by that, a 4-layered structure is constituted. The entire part of the recording medium is thereafter coated with a UV curing type resin, by that a magneto-optical disk is obtd. The precise control of the flow of the heat to be applied to the recording film is made possible according to this magneto-optical recording medium. Since the desired arbitrary magnetic domains and micro-magnetic domains are formable with the high accuracy, the ultra-high density magneto-optical recording medium is realized.

10. 发明专利

JP2003022625A Preamble pattern for magnetic recording, and magnetic recorder 审中-公开
标题翻译：用于磁记录的前缀图形和磁记录器
公开(公告)号：JP2003022625A
公开(公告)日：2003-01-24
申请号：JP2001208681
申请日：2001-07-10
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TSUCHINAGA HIROYUKI
IPC分类号： G11B20/14 , G11B5/00 , G11B5/012 , G11B5/09 , G11B20/10 , G11B20/12 , G11B20/22 , G11B27/30 , H03L7/091
CPC分类号： G11B20/10101 , G11B5/012 , G11B5/09 , G11B20/10009 , G11B20/22 , G11B27/3027 , G11B2005/001 , G11B2220/20 , H03L7/091
摘要： PROBLEM TO BE SOLVED: To provide a means for reducing the effects of a jitter noise without increasing the length of a preamble pattern space.
SOLUTION: Use of amplitude information on the peak point of a reproduction signal with few effects of jitter noise is enabled by modifying a preamble pattern from a conventional period pattern of 4T to a period pattern of 6T or more. Thereby, the stability of amplitude control is improved. In phase control, a deviation of sampling timing is estimated from sample data of one period of the preamble pattern to accelerate the speed of a lead-in operation of phase control to be high.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种用于在不增加前导码图案空间的长度的情况下减少抖动噪声的影响的装置。解决方案：通过将前导码模式从4T的常规周期模式修改为6T或更大的周期模式，可以实现对具有很少抖动噪声影响的再现信号的峰值点的使用。从而提高幅度控制的稳定性。在相位控制中，根据前导码模式的一个周期的采样数据估计采样定时的偏差，以将相位控制的导入操作的速度加速到高。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式