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21. 发明申请

US20050073935A1 Method for reproducing information from optical recording medium, information reproducer, and optical record medium 审中-公开
标题翻译：用于从光学记录介质，信息再现器和光学记录介质再现信息的方法
公开(公告)号：US20050073935A1
公开(公告)日：2005-04-07
申请号：US10503955
申请日：2003-02-14
申请人： Hideaki Miura , Tatsuya Kato
发明人： Hideaki Miura , Tatsuya Kato
IPC分类号： G11B7/005 , G11B7/00 , G11B7/125 , G11B7/126 , G11B7/26 , G11B7/24
CPC分类号： G11B7/005 , G11B7/126 , G11B7/24038 , G11B7/26
摘要： It is an object of the present invention to provide an information reproducing method for reproducing information from a data rewritable type optical recording medium having a plurality of information recording layers, which can prevent the data degradation phenomenon from occurring. The information reproducing method according to the present invention is directed to reproducing information from an optical recording medium 10 having at least a stacked L0 layer 20 and L1 layer 30 by projecting a laser beam thereonto via a light incidence plane 13a and information is reproduced by setting λ/NA to be equal to or shorter than 700 nm, where A is a wavelength of the laser beam and NA is a numerical aperture (NA) of an objective lens, and setting the laser beam to a reproducing power Pr0 when information recorded in the L0 layer 20 is to be reproduced and a reproducing power Pr1 when information recorded in the L1 layer 30 is to be reproduced.
摘要翻译：本发明的目的是提供一种用于从具有多个信息记录层的数据可重写型光学记录介质再现信息的信息再现方法，其可以防止数据劣化现象发生。根据本发明的信息再现方法涉及通过经由光入射平面13a将激光束投射到至少层叠的L0层20和L1层30的光记录介质10来再现信息，并且通过设置来再现信息 λ/ NA等于或小于700nm，其中A是激光束的波长，NA是物镜的数值孔径（NA），并且当记录在信息中时将激光束设置为再现功率Pr0 当要再现记录在L1层30中的信息时，将再现L0层20和再现功率Pr1。

22. 发明授权

US5043971A Method and apparatus for pre-compensation in an optical disc 失效
标题翻译：在光盘中预补偿的方法和装置
公开(公告)号：US5043971A
公开(公告)日：1991-08-27
申请号：US414046
申请日：1989-09-28
申请人： Hai-Hoa Van , Joel D. Finegan , Der-Chang Hsieh
发明人： Hai-Hoa Van , Joel D. Finegan , Der-Chang Hsieh
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/126
CPC分类号： G11B7/126 , G11B7/0045
摘要： A method and associated apparatus for providing improved data mark formation on an optical disc is disclosed. The amplitude of a laser write beam in an optical recording system is varied during application of the mark. Additionally, the illumination period of the laser is adjusted to account for differences between the actual length of a formed data mark and the desired length of a data mark.
摘要翻译：公开了一种在光盘上提供改进的数据标记形成的方法和相关装置。激光写入光束在光学记录系统中的幅度在标记的应用期间是变化的。此外，调整激光器的照明周期以考虑形成的数据标记的实际长度与数据标记的期望长度之间的差异。

23. 发明授权

US4949311A Single laser direct read after write system (draw) 失效
标题翻译：单激光直读后写系统（画）
公开(公告)号：US4949311A
公开(公告)日：1990-08-14
申请号：US274578
申请日：1988-11-22
申请人： James A. Barnard
发明人： James A. Barnard
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/126 , G11B7/1353
CPC分类号： G11B7/00458 , G11B7/126 , G11B7/1353
摘要： A single laser system utilizes a grating to provide a shifted beam and a nonshifted beam which are directed through a polarized beamsplitter in the nonsplitting direction. The beams are directed through a 1/4 wave plate by means of a folding mirror. The beams from the 1/4 wave plate are focused onto the recording surface to generate a write spot and a DRAW (direct read after write) spot. The DRAW spot is positioned behind the write spot at a distance of n+1/2 bits. Reflections from the DRAW spot are collimated back through the 1/4 wave plate onto the folding mirror. The folding mirror directs the collimated DRAW verify spot to the polarized beamsplitter where it is reflected through a lens to a DRAW spot photodetector for detection. In a like manner, read reflections are directed back to be focused on a read photodetector.
摘要翻译：单个激光系统利用光栅来提供偏移光束和非分光束，其在非分割方向上被引导通过偏振分束器。通过折叠镜将光束引导通过1/4波片。来自1/4波片的光束被聚焦到记录表面上以产生写点和DRAW（写入后的直接读取）点。绘制点位于写入点后面，距离为n + 1/2位。来自DRAW点的反射通过1/4波片反射回折叠镜。折叠镜将准直的DRAW验证光点引导到偏振分光镜，通过透镜被反射到用于检测的DRAW光点检测器。以类似的方式，读取反射被引导回集中在读取光检测器上。

24. 发明授权

US4425637A Optical recording apparatus 失效
标题翻译：光记录装置
公开(公告)号：US4425637A
公开(公告)日：1984-01-10
申请号：US316908
申请日：1981-10-30
申请人： Shinichi Tanaka , Tadashi Abe
发明人： Shinichi Tanaka , Tadashi Abe
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/125 , G11B7/126 , G11B20/10 , G11B20/22 , H03K5/05 , H04N5/781
CPC分类号： G11B7/126 , G11B20/10009 , G11B20/22 , G11B7/0045 , H03K5/05
摘要： An optical recording apparatus for recording digital signals controls the pulse length of the recorded signals by delaying either the positive-going edges or the negative-going edges of the digital signals. The edges are delayed by either a logical AND or a logical OR operation between an original digital signal and a delayed signal or between an original digital signal and an output signal from a monostable multivibrator which has been triggered by an edge of the original digital signal.
摘要翻译：用于记录数字信号的光学记录装置通过延迟数字信号的正向沿或负向边缘来控制记录信号的脉冲长度。边缘被延迟原始数字信号和延迟信号之间的逻辑与或逻辑“或”运算，或者在原始数字信号与由原始数字信号的边沿触发的单稳态多谐振荡器的输出信号之间延迟。

25. 发明授权

US4283785A Optical information recording apparatus 失效
标题翻译：光信息记录装置
公开(公告)号：US4283785A
公开(公告)日：1981-08-11
申请号：US33806
申请日：1979-04-26
申请人： Toshimitsu Miyauchi , Yoshito Tsunoda
发明人： Toshimitsu Miyauchi , Yoshito Tsunoda
IPC分类号： H04N5/85 , G11B7/0045 , G11B7/12 , G11B7/125 , G11B7/126 , G11B20/06 , G11B20/18 , G11B27/36 , H01S5/0683 , G11B7/00
CPC分类号： G11B7/126 , G11B20/06 , G11B20/18 , G11B27/36 , G11B7/0045 , G11B7/12 , H01S5/06835
摘要： In an optical information recording apparatus, a version of a recording light emitted from a light source and reflected by a recording medium is detected to control the recording light output power of the light source.
摘要翻译：在光学信息记录装置中，检测从光源发射并由记录介质反射的记录光的版本，以控制光源的记录光输出功率。

26. 发明申请

US20210257000A1 INFORMATION RECORDING DEVICE, INFORMATION PLAYBACK DEVICE, INFORMATION RECORDING MEDIUM, METHOD, AND PROGRAM 有权
公开(公告)号：US20210257000A1
公开(公告)日：2021-08-19
申请号：US17250191
申请日：2019-05-22
申请人： SONY CORPORATION
发明人： NOBUYOSHI KOBAYASHI
IPC分类号： G11B7/0045 , G11B7/126
摘要： In an information recording/playback device adopting multi-value recording, a configuration to limit the size of marks to be recorded on a recording medium only to a predetermined size equal to or smaller than a beam spot size to enable prevention and reduction of crosstalk and crosswrite is implemented. A recording pulse generation unit configured to generate a recording pulse based on a multi-value modulation data, and a data recording unit configured to record the mark on the recording medium on the basis of the recording pulse are included. The data recording unit executes recording processing of setting sizes of all of marks to be recorded on the recording medium to a size equal to or smaller than a spot size at a half (½) level of a maximum value (Pmax) of a two-dimensional light intensity distribution (power profile) of a beam spot, and executes data recording processing of forming recording regions in modes having different densities of recording marks according to the levels of the multi-value modulation data.

27. 发明授权

US10910007B1 Heat-assisted magnetic recording device capable of providing negative electrical potential at NFT 有权
公开(公告)号：US10910007B1
公开(公告)日：2021-02-02
申请号：US16791238
申请日：2020-02-14
申请人： Western Digital Technologies, Inc.
发明人： Tan Trinh , Sukumar Rajauria , Yuichi Aoki , Kosuke Nagase , Erhard Schreck , Qing Dai
IPC分类号： G11B11/105 , G11B5/60 , G11B5/31 , G11B5/245 , G11B5/00 , G11B7/126
摘要： A heat-assisted magnetic recording (HAMR) hard disk drive has a gas-bearing slider supporting a near-field transducer (NFT) and a NFT temperature sensor (NTS). An optional first IVC circuitry may provide a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a negative bias voltage to the NTS (and the connected NFT) relative to the disk to minimize the adverse effects of excessive heating on the NFT.

28. 发明授权

US10811043B2 Mode splitter between TE and TM polarization for heat-assisted magnetic recording device 有权
公开(公告)号：US10811043B2
公开(公告)日：2020-10-20
申请号：US16714919
申请日：2019-12-16
申请人： Seagate Technology LLC
发明人： Christopher Neil Harvey , Aidan Dominic Goggin , Kelly Elizabeth Callan , Reyad Mehfuz
IPC分类号： G11B11/105 , G11B5/48 , G11B5/60 , G11B5/31 , G11B5/00 , G11B7/126
摘要： An apparatus includes a first waveguide core extending along a light-propagation direction and configured to receive light from a light source at a combined transverse electric (TE) mode and a transverse magnetic (TM) mode. A second waveguide core is spaced apart from the first waveguide core and is configured to couple light at a TM mode to the second waveguide core. A near-field transducer (NFT) is disposed at a media-facing surface of a write head, the NFT receiving the light from the first waveguide core or the second waveguide core and heating a magnetic recording medium in response thereto.

29. 发明授权

US10515658B1 Laser calibration using temperature compensation equation for heat-assisted magnetic recording device 有权
公开(公告)号：US10515658B1
公开(公告)日：2019-12-24
申请号：US16151910
申请日：2018-10-04
申请人： Seagate Technology LL
发明人： Drew Michael Mader
IPC分类号： G11B11/105 , G11B5/012 , G11B13/04 , G11B5/00 , G11B7/1267 , G11B7/1263 , G11B7/126
摘要： A method includes generating, during manufacture of a heat-assisted magnetic recording (HAMR) disk drive, a temperature compensation equation for a compensation factor using initial operating currents supplied to a laser diode of the disk drive at different initial operating temperatures and an efficiency value based on the initial operating temperatures. The operating currents are representative of currents for recording data to or erasing data from a magnetic recording medium. The temperature compensation equation is stored in the disk drive. A subsequent efficiency value is determined based on at least one of the initial operating temperatures and an operating temperature differing from the initial operating temperatures. An updated compensation factor at the operating temperature is determined during field operation using the temperature compensation equation and the subsequent efficiency value. An updated operating current is calculated using the updated compensation factor and the operating temperature. A current supplied to the laser diode for a subsequent write operation is adjusted to the updated operating current.

30. 发明授权

US10482908B2 Performance monitoring of a near-field transducer of a heat-assisted magnetic recording slider 有权
公开(公告)号：US10482908B2
公开(公告)日：2019-11-19
申请号：US16193189
申请日：2018-11-16
申请人： Seagate Technology LLC
发明人： Riyan Mendonsa , Jon D. Trantham , James Dillon Kiely , Peng Li , Joshua Ward Christensen
IPC分类号： G11B11/105 , G11B5/455 , G11B5/60 , G11B5/00 , G11B7/126
摘要： An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.

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