公开(公告)号：US08641832B2

公开(公告)日：2014-02-04

申请号：US12295372

申请日：2007-03-30

申请人： Atsushi Kikugawa ,  Shinichiro Sakashita

发明人： Atsushi Kikugawa ,  Shinichiro Sakashita

IPC分类号： C22F1/16 ,  H01F1/053

CPC分类号： H01F41/026 ,  C23C14/16 ,  C23C14/541 ,  H01F7/0221

摘要： An objective of the present invention is to provide a method for producing a rare earth metal-based permanent magnet having an Al film containing Mg, which exhibits an excellent salt water resistance. The present invention, which is to accomplish the objective, is a method for producing a rare earth metal-based permanent magnet having formed on the surface thereof an Al film containing Mg by a vapor deposition, characterized in that the production method comprises, in the case of cooling the magnet from a high temperature of 160° C. or higher after the completion of the vapor deposition step inside the treating chamber of a deposition apparatus, rapidly cooling down the magnet at a cooling rate of 10° C./min or higher until the temperature of the magnet reaches at least 60° C.

摘要翻译： 本发明的目的是提供一种具有优异的耐盐水性的具有含有Mg的Al膜的稀土金属类永磁体的制造方法。 本发明是为了制造稀土金属类永磁体的方法，其特征在于，在表面形成有通过气相沉积形成Mg的Al膜，其特征在于，在 在沉积设备的处理室内完成气相沉积步骤之后，从160℃或更高的高温冷却磁体的情况，以10℃/ min的冷却速度快速冷却磁体， 直到磁体的温度达到至少60℃为止。

公开(公告)号：US20100006182A1

公开(公告)日：2010-01-14

申请号：US12295372

申请日：2007-03-30

申请人： Atsushi Kikugawa ,  Shinichiro Sakashita

发明人： Atsushi Kikugawa ,  Shinichiro Sakashita

IPC分类号： C22F1/16 ,  H01F1/053

CPC分类号： H01F41/026 ,  C23C14/16 ,  C23C14/541 ,  H01F7/0221

摘要： An objective of the present invention is to provide a method for producing a rare earth metal-based permanent magnet having an Al film containing Mg, which exhibits an excellent salt water resistance. The present invention, which is to accomplish the objective, is a method for producing a rare earth metal-based permanent magnet having formed on the surface thereof an Al film containing Mg by a vapor deposition, characterized in that the production method comprises, in the case of cooling the magnet from a high temperature of 160° C. or higher after the completion of the vapor deposition step inside the treating chamber of a deposition apparatus, rapidly cooling down the magnet at a cooling rate of 10° C./min or higher until the temperature of the magnet reaches at least 60° C.

摘要翻译： 本发明的目的是提供一种具有优异的耐盐水性的具有含有Mg的Al膜的稀土金属类永磁体的制造方法。 本发明是为了制造稀土金属类永磁体的方法，其特征在于，在表面形成有通过气相沉积形成Mg的Al膜，其特征在于，在 在沉积设备的处理室内完成气相沉积步骤之后，从160℃或更高的高温冷却磁体的情况，以10℃/ min的冷却速度快速冷却磁体， 直到磁体的温度达到至少60℃为止。

公开(公告)号：US09657367B2

公开(公告)日：2017-05-23

申请号：US14125715

申请日：2012-06-29

申请人： Katsuyoshi Furusawa ,  Atsushi Kikugawa

发明人： Katsuyoshi Furusawa ,  Atsushi Kikugawa

IPC分类号： C22B7/00 ,  H01F41/02 ,  C22B1/00 ,  B22F8/00 ,  C22B59/00

CPC分类号： C22B1/00 ,  B22F8/00 ,  B22F2998/10 ,  C22B1/005 ,  C22B7/00 ,  C22B7/001 ,  C22B59/00 ,  H01F41/0253 ,  Y02P10/214 ,  Y02P10/24 ,  Y02W30/541 ,  B22F9/04 ,  B22F9/023 ,  B22F2201/20

摘要： An object of the present invention is to provide a method for producing an alloy recycled material by effectively removing carbon from a carbon-containing alloy, which is produced as scrap or sludge of an R—Fe—B based permanent magnet, a used magnet, or the like. The method of the present invention as a means for resolution is characterized in that a carbon-containing R—Fe—B based permanent magnet alloy is subjected to an HDDR treatment to remove carbon. An alloy recycled material produced by the method of the present invention contains a reduced amount of carbon. Therefore, in the case where it is recycled for the production of a magnet, even when an increased amount is subjected to high-frequency heating in a vacuum melting furnace, a non-negligible increase in the amount of carbon contained in the produced magnet can be avoided.

公开(公告)号：US08243573B2

公开(公告)日：2012-08-14

申请号：US12362378

申请日：2009-01-29

申请人： Atsushi Kikugawa

发明人： Atsushi Kikugawa

IPC分类号： G11B7/00

CPC分类号： G11B20/10046 ,  G11B7/126 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10111 ,  G11B20/10296 ,  G11B20/10425 ,  G11B20/10481 ,  G11B2220/2541

摘要： If the read speed is increased while high-frequency modulated carrier is fixed at a constant frequency, it becomes difficult to separate the read signal from the carrier by using bandwidth limitation of the analog system because the upper limit of the read signal band nears to the carrier frequency. Moreover, if the separation between them is eased by raising the carrier frequency, a problem that write-waveform controls become difficult arises. However, the carrier amplitude can be suppressed simultaneously preventing leakage to the read signal band by converting the carrier frequency into the stop-band of the adaptive equalizer by making the use of aliasing that occurs at the A/D conversion.

摘要翻译： 如果在高频调制载波固定为恒定频率的情况下增加读取速度，则由于读取信号频带的上限接近于模拟系统的上限，因此难以将读取信号与载波分离，因为使用模拟系统的带宽限制 载波频率 此外，如果通过提高载波频率来缓解它们之间的间隔，则会产生写波形控制变得困难的问题。 然而，通过使用在A / D转换时发生的混叠，能够同时抑制载波振幅，从而将载波频率转换成自适应均衡器的阻带，从而可以防止对读取信号频带的泄漏。

公开(公告)号：US08045431B2

公开(公告)日：2011-10-25

申请号：US12509614

申请日：2009-07-27

申请人： Atsushi Kikugawa

发明人： Atsushi Kikugawa

IPC分类号： G11B7/00

CPC分类号： G11B7/005 ,  G11B7/1263

摘要： In the multi-tone demodulation (MTD) technique, even if an input bandwidth is widened to obtain a larger SNR gain, an increase in the signal to noise ration (SNR) gain cannot always be obtained due to clock jitter that increases clock noise. Also, noise is sometimes superimposed on the clock supplied to an analog to digital converter circuit (ADS) and the noise lowers the performance. Accordingly, the optical disc apparatus loosely regulates the bandwidth of a pulsed read signal; boosts the high-frequency components of a waveform of a driving signal of a laser diode; and synchronizes autonomously a driving clock of the ADC and a digital to analog converter circuit (DAC) with a clock of the pulsed read signal.

摘要翻译： 在多音调解调（MTD）技术中，即使增加输入带宽以获得较大的SNR增益，由于时钟抖动增加，由于时钟抖动增加，信噪比（SNR）增益不能总是得到提高。 此外，噪声有时叠加在提供给模数转换器电路（ADS）的时钟上，噪声降低了性能。 因此，光盘装置松散地调节脉冲读取信号的带宽; 升高激光二极管的驱动信号的波形的高频分量; 并自动同步ADC的驱动时钟和数模转换器电路（DAC）与脉冲读取信号的时钟。

公开(公告)号：US07889607B2

公开(公告)日：2011-02-15

申请号：US11333284

申请日：2006-01-18

申请人： Atsushi Kikugawa ,  Hiroyuki Minemura

发明人： Atsushi Kikugawa ,  Hiroyuki Minemura

IPC分类号： G11B7/00

CPC分类号： G11B7/005

摘要： This invention involves irradiating an optical disk with laser light, pulse-driven by a high-frequency signal from an HF oscillator, and converting the output of a photo-detector that receives laser light reflected from the optical disk into an electronic pulse readout signal using a current amplifier. The pulse readout signal is converted into a temporally continuous readout signal by a peak hold circuit. The invention solves the problems of SNR deterioration of the readout signal and the difficulty of removing the impact of high-frequency modulation accompanying the increase in the readout speed factor in optical disk devices.

摘要翻译： 本发明涉及用来自HF振荡器的高频信号脉冲驱动的激光照射光盘，并将接收从光盘反射的激光的光检测器的输出转换为电子脉冲读出信号，该信号使用 一个电流放大器。 脉冲读出信号由峰值保持电路转换成时间连续的读出信号。 本发明解决了伴随着光盘装置读出速度因素的增加而引起的读出信号的信噪比恶化的问题和消除高频调制的冲击的难度。

公开(公告)号：US20090196156A1

公开(公告)日：2009-08-06

申请号：US12362378

申请日：2009-01-29

申请人： Atsushi Kikugawa

发明人： Atsushi Kikugawa

IPC分类号： G11B7/00

CPC分类号： G11B20/10046 ,  G11B7/126 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10111 ,  G11B20/10296 ,  G11B20/10425 ,  G11B20/10481 ,  G11B2220/2541

摘要： If the read speed is increased while high-frequency modulated carrier is fixed at a constant frequency, it becomes difficult to separate the read signal from the carrier by using bandwidth limitation of the analog system because the upper limit of the read signal band nears to the carrier frequency. Moreover, if the separation between them is eased by raising the carrier frequency, a problem that write-waveform controls become difficult arises. However, the carrier amplitude can be suppressed simultaneously preventing leakage to the read signal band by converting the carrier frequency into the stop-band of the adaptive equalizer by making the use of aliasing that occurs at the A/D conversion.

摘要翻译： 如果在高频调制载波固定为恒定频率的情况下增加读取速度，则由于读取信号频带的上限接近于模拟系统的上限，因此难以将读取信号与载波分离，因为使用模拟系统的带宽限制 载波频率 此外，如果通过提高载波频率来缓解它们之间的间隔，则会产生写波形控制变得困难的问题。 然而，通过使用在A / D转换时发生的混叠，能够同时抑制载波振幅，从而将载波频率转换成自适应均衡器的阻带，从而可以防止对读取信号频带的泄漏。

公开(公告)号：US07289284B2

公开(公告)日：2007-10-30

申请号：US11195202

申请日：2005-08-01

申请人： Reiko Arai ,  Takehiko Hamaguchi ,  Atsushi Kikugawa ,  Hideaki Maeda ,  Liping Shen ,  Mikio Suzuki

发明人： Reiko Arai ,  Takehiko Hamaguchi ,  Atsushi Kikugawa ,  Hideaki Maeda ,  Liping Shen ,  Mikio Suzuki

IPC分类号： G11B5/02

CPC分类号： G11B5/012 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/3903 ,  G11B27/36 ,  G11B2005/0016 ,  G11B2005/0029 ,  G11B2220/20

摘要： Embodiments of the invention prevent demagnetization or degaussing of recorded magnetizations, even if a stray field is applied. In one embodiment, an output of a read head including a magneto-resistive effect element is inputted to a stray field detector through a DC amplifier and a DC filter. The stray field detector monitors dc components of the output from the read head, and escapes a head from above a magnetic recording medium.

摘要翻译： 即使应用杂散场，本发明的实施例也防止记录磁化的退磁或消磁。 在一个实施例中，包括磁阻效应元件的读出头的输出通过DC放大器和DC滤波器输入到杂散场检测器。 杂散场检测器监测来自读头的输出的直流分量，并从磁记录介质的上方排出头。

公开(公告)号：US07153546B2

公开(公告)日：2006-12-26

申请号：US10790803

申请日：2004-03-03

申请人： Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Noboru Shimizu ,  Yukio Honda ,  Yuzuru Hosoe

发明人： Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Noboru Shimizu ,  Yukio Honda ,  Yuzuru Hosoe

IPC分类号： H05B6/00

CPC分类号： G11B5/667 ,  G11B5/66 ,  G11B5/7325 ,  Y10S428/90

摘要： Provided are a double-layer perpendicular magnetic recording medium having a high medium S/N at an areal recording density of 50 Gbits or more per square inch, and a magnetic storage apparatus having excellent reliability with a low error rate. The perpendicular magnetic recording medium is formed by sequentially laminating a domain control layer, an amorphous soft magnetic underlayer, an intermediate layer, and a perpendicular recording layer on a substrate. The domain control layer is a triple-layer film formed by laminating a first polycrystalline soft magnetic layer, a disordered antiferromagnetic layer, and a second polycrystalline soft magnetic layer from a substrate side.

公开(公告)号：US08089845B2

公开(公告)日：2012-01-03

申请号：US12271093

申请日：2008-11-14

申请人： Atsushi Kikugawa

发明人： Atsushi Kikugawa

IPC分类号： G11B7/00

CPC分类号： G11B20/10009 ,  G11B7/005 ,  G11B20/10037 ,  G11B20/10203 ,  G11B20/10425 ,  G11B20/1403 ,  G11B2007/0013 ,  G11B2020/1457

摘要： The generation of a pseudo-lock is prevented in a JFB offset compensator whose use has been conventionally limited due to a tendency to generate the pseudo-lock, and performance degradation of a PLL and a Viterbi decoder is suppressed. A means for monitoring an offset of a read signal is provided independently from the JFB offset compensator. With this configuration, the generation or a possibility of the generation of the pseudo-lock can be detected to reset an integrator. In order to reduce the influence of a large sporadic offset triggering the pseudo-lock, there may also be provided a limitter for limiting the absolute value of an offset signal inputted to the integrator or a limitter for limiting the absolute value of an offset compensation signal.

摘要翻译： 在由于产生伪锁定的趋势而通常限制其使用的JFB偏移补偿器中，防止了伪锁定的产生，并且抑制了PLL和维特比解码器的性能劣化。 与JFB偏移补偿器独立地提供用于监视读取信号的偏移的装置。 利用这种配置，可以检测生成伪锁定的可能性或重置积分器。 为了减少触发伪锁定的大量零星偏移的影响，还可以提供限制输入到积分器的偏移信号的绝对值或用于限制偏移补偿信号的绝对值的限幅器 。