公开(公告)号：EP0030301A3

公开(公告)日：1981-11-25

申请号：EP80107235

申请日：1980-11-20

Applicant: International Business Machines Corporation

Inventor： Cheatham, Samuel David ,  Haynes, Munro King

IPC: G11B05/00 ,  G11B05/02 ,  G11B05/012

CPC classification number: G11B5/02 ,  G11B5/488 ,  G11B5/596 ,  G11B27/3027 ,  G11B2220/20 ,  G11B2220/90

Abstract: ©7 A reference signal to be stabilized in a magnetic record member is recorded via a head Hl having a given maximal gap length and pole pieces of high saturation induction. After the reference signal is recorded, the magnetic record member is surface erased for stabilizing the just recorded reference signal. The surface erasing is performed by AC erasing via a transducer H2 having a gap length less than said maximal gap length. The pole pieces of the erasing head need not have the high saturation induction of the first mentioned head. After such stabilization, information signals can be easily recorded and recovered from the magnetic record member by using transducers H3 with gap lengths less than the given maximal gap length of head Hl and using normal ferrite heads having a lower saturation induction than the head H1. The reference signal can serve as a position indicating signal in a magnetic record member, such as a storage disk ortape. The reference signal can also be used for other purposes, such as phase control for recording and in a controlled access or security system.

Abstract translation: 通过具有给定的最大间隙长度的磁头H1和高饱和感应的磁极片来记录要在磁记录部件中稳定的参考信号。 在记录参考信号之后，磁记录元件被表面擦除，以稳定刚刚记录的参考信号。 表面擦除通过经由具有小于所述最大间隙长度的间隙长度的换能器H2的AC擦除来执行。 擦除头的极片不需要具有第一个头部的高饱和感应。 在这样的稳定​​化之后，通过使用间隙长度小于头H1的给定最大间隙长度的换能器H3，并使用具有比头H1低的饱和感应的普通铁氧体磁头，可以容易地从磁记录部件记录和恢复信息信号。 参考信号可以用作诸如存储盘或磁带的磁记录部件中的位置指示信号。 参考信号也可以用于其他目的，例如用于记录的相位控制和受控访问或安全系统。

公开(公告)号：EP0132852A3

公开(公告)日：1987-11-19

申请号：EP84108944

申请日：1984-07-27

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Akiyama, Junichi c/o Patent Division ,  Chiba, Shu c/o Patent Division ,  Sawazaki, Norikazu c/o Patent Division ,  Yatabe, Shigeru c/o Patent Division

IPC: G11B05/00 ,  G11B05/33

CPC classification number: G11B5/332 ,  G11B5/1278 ,  G11B20/24

Abstract: An apparatus for reproducing a signal recorded, in the form of a perpendicular signal magnetization, on a perpendicular magnetic recording layer (4) backed with a high permeability layer (3) of a magnetic recording medium (1). A thin-film magnetic material (5) is disposed to face the recording layer so that an enlarged magnetized region is formed in the high permeability layer, which includes the position at which the magnetic material faces the recording layer. In this region, magnetic variation occurs in response to the signal magnetization of the recording layer at the position the magnetic material faces the recording layer. A detecting member (10) such as a coil is disposed in the proximity of the magnetic material so as to be magnetically coupled to the enlarged magnetized region of the high permeability layer. The detecting member is used as a tuning element of a tuning circuit (10, 11) supplied with high frequency energy. An resonance output voltage of the high frequency circuit varies in response to the detection of magnetic variation in the high permeability layer. A reproducing circuit (14) detects the variation in the resonance output voltage of the high frequency circuit to reproduce the signal recorded on the recording layer.

公开(公告)号：EP0105531A3

公开(公告)日：1986-02-05

申请号：EP83111439

申请日：1983-07-14

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Sawazaki, Norikazu

IPC: G11B05/00 ,  G11B05/33 ,  G11B05/62 ,  G11B05/12

CPC classification number: G11B5/1278 ,  G11B5/00 ,  G11B5/33 ,  G11B5/332 ,  G11B5/62

Abstract: Signals are recorded on a magnet tape (1) having a magnetic recording layer (1b-2) containing a magnetic material whose high frequency characterstic varies with a magnetic field produced therein. Changes in the coupling degree of a high frequency coupling circuit (12, 20a) caused by a signal field allows to reproduce a recorded signal.

Abstract translation: 信号记录在具有包含磁性材料的磁记录层（1b-2）的磁带（1）上，磁性材料的高频特性随其中产生的磁场而变化。 由信号场引起的高频耦合电路（12,20a）的耦合度的变化允许再现记录的信号。

公开(公告)号：EP0033236A3

公开(公告)日：1982-03-10

申请号：EP81300315

申请日：1981-01-23

Applicant: SPERRY CORPORATION

Inventor： Chi, Chao Shu

IPC: G11B05/00 ,  G11B05/12 ,  G11B05/30

CPC classification number: G11B5/1278 ,  G11B5/02 ,  G11B5/39 ,  G11B15/125

Abstract: Apparatus for perpendicular magnetic recording on a moving magnetic medium (14) is designed to provide a low reluctance return path for the magnetic recording flux. The recording head comprises a core (10) of magnetic material carrying a coil (W1), the core having a narrow recording limb (11),and a flux return limb (12) having a much greater cross sectional area. A return path for the magnetic flux is provided on the other side of the magnetic medium (14) and this may comprise either a similar head (10') or a high permeability substrate on which the medium is deposited. The magnetic medium (14) moves in such a direction that it passes first under the flux return limb (12) and then underthe recording limb (11). For reading the recorded information a sub-core (16) carrying a winding (W3) is attached to the flux return limb (12) and is separated by a gap from the tip of the recording limb (15) so as to form with the core a ring-type reading head. This is rendered inoperative during recording by supplying to the winding (W3) a sufficient current to saturate the sub-core. An alternative method of reading employs magneto-resistive elements within the space between the recording limb (11) and the flux return limb (12) arranged to sense flux variations from the recording medium (14).

Abstract translation: 用于在移动磁介质（14）上垂直磁记录的装置被设计成为磁记录磁通提供低磁阻返回路径。 记录头包括承载线圈（W1）的磁性材料的芯（10），该芯具有窄记录肢（11），以及具有大得多横截面积的磁通返回分支（12） 。 用于磁通的返回路径设置在磁介质（14）的另一侧上，并且其可以包括类似的头（10分钟）或介质沉积在其上的高渗透性基底。 磁性介质（14）沿其通过首先在磁通返回分支（12）之下然后在记录分支（11）下面的方向移动。 ...为了读取记录信息，携带绕组（W3）的子芯（16）附接到磁通返回分支（12），并与记录分支（15）的尖端间隔一定距离 与核心形成一个环型阅读头。 这在记录期间通过向绕组（W3）供应充足的电流以使副芯饱和来使其不工作。 另一种读取方法在记录肢体（11）和通量返回肢体（12）之间的空间内采用磁阻元件，该磁通返回支路（12）布置成感测来自记录介质（14）的磁通量变化。

公开(公告)号：EP0145836A3

公开(公告)日：1988-08-03

申请号：EP84108416

申请日：1984-07-17

Applicant: ZYGO CORPORATION

Inventor： Sommargren, Gary E.

IPC: G01B11/14 ,  G01B09/02 ,  G01B11/00 ,  G11B05/00

CPC classification number: G11B5/6005 ,  G01B9/02022 ,  G01B11/14 ,  G01B2290/70

Abstract: Apparatus is disclosed for the measurement of the absolute distance between a piano test and a piano reference surface which are in close proximity to each other. The preferred way of accomplishing this is with a polarization phase modulated Fizeau interferometer in which the reference surface is a front surface polarizer. The modulated interference pattern is photosensed with an array camera, and the signals processed to provide the absolute distance between the piano test surface and the piano reference surface. A method is also disclosed, using the instant invention, for determining the flying height of a magnetic head assembly used in computer mass storage systems.

公开(公告)号：EP0048888A3

公开(公告)日：1983-09-07

申请号：EP81107273

申请日：1981-09-15

Applicant: TDK CORPORATION

Inventor： Ohya, Kazuo ,  Fujishima, Hiroki ,  Ishijima, Norio ,  Itoga, Hiroyoshi ,  Kominami, Yasuhiko

IPC: H01F01/14 ,  C22C19/07 ,  G11B05/00

CPC classification number: G11B5/147 ,  C22C45/04 ,  H01F1/15316

Abstract: The present invention relates to an amorphous magnetic alloy material suited for use as a core material of a magnetic head. When the magnetic head is subjected to a slide contact with a magnetic tape over a long period of time, a film of oxide and the like is formed on the surface of an amorphous magnetic alloy material due to chemically corrosive media frequently contained in the magnetic coating layer of the magnetic tape or due to carbon dioxide, water and the like contained in the air. The amorphous magnetic alloy material of the present invention is highly corrosion resistant due to the combination of chromium and platinum family element(s), and, the inconveniencies in a magnetic head, due to chemical wear, can be prevented even where the magnetic head is operated or stored in a considerably severe condition.

公开(公告)号：EP0051218A3

公开(公告)日：1982-12-01

申请号：EP81108743

申请日：1981-10-22

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Yamamoto, Kazuhiko

IPC: G06F15/40 ,  G06F15/20 ,  G11B05/00

CPC classification number: H04N1/2175 ,  G06F17/30017 ,  G06T1/0007 ,  H04N2201/0081 ,  H04N2201/0082 ,  H04N2201/0089

Abstract: A 2-dimension scanning device (11) scans picture information. When one-page picture information is stored into a page buffer (21), it is displayed by a display unit (13). Thereafter, when an operator depresses an abandon key (35), the picture information is abandoned. When the operator depresses a record key (37), the picture information is recorded on a recording medium. The picture information is read out and displayed by the display unit (13), whenever necessary. The picture information is deleted from the recording medium when a delete key (41) is operated. When a confirmation key (39) is operated, a retrieval title corresponding to the picture information is recorded on the recording medium

公开(公告)号：WO1997041550A1

公开(公告)日：1997-11-06

申请号：PCT/US1997007024

申请日：1997-04-25

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： INTERNATIONAL BUSINESS MACHINES CORPORATION ,  CUNNINGHAM, Earl, A. ,  CHRISTNER, Jodie, A.

IPC: G11B05/00

CPC classification number: G11B5/5547 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B5/5526 ,  G11B5/59683 ,  G11B19/04 ,  G11B2005/0013 ,  G11B2005/0016

Abstract: A rigid disk drive unit (12) includes head assemblies (28) having both inductive heads (44) and magnetoresistive heads (46). When information is read from a disk surface (20), signals from the inductive head (44) and the magnetoresistive head (46) are combined to provide an output signal, thereby to overcome disadvantages of using either signal alone. The relative contributions (MR, IND) of the magnetoresistive and inductive signals are varied to optimize performance depending on the radial position of the head assembly (28) over a magnetic disk (18) and upon whether the information being read is data (24A) or servo position information (24B). The inductive signal is ignored during data recovery procedure head shift operations (136).

Abstract translation: 刚性盘驱动单元（12）包括具有感应头（44）和磁阻头（46）的头组件（28）。 当从盘表面（20）读取信息时，来自感应头（44）和磁阻头（46）的信号被组合以提供输出信号，由此克服单独使用任一信号的缺点。 磁阻和感应信号的相对贡献（MR，IND）被改变，以根据磁头组件（28）在磁盘（18）上的径向位置优化性能，以及正在读取的信息是否是数据（24A） 或伺服位置信息（24B）。 在数据恢复过程头移动操作期间，电感信号被忽略（136）。

公开(公告)号：WO1995006311A1

公开(公告)日：1995-03-02

申请号：PCT/RU1993000205

申请日：1993-08-20

Applicant: ROMANENKO, Alexandr Jurievich

IPC: G11B05/00

CPC classification number: G11B5/82 ,  G11B5/5526

Abstract: The proposed method involves the preliminary alignment of the magnetization vectors of the disk carrier's magnetic layer, creation of standard magnetic tracks, and between them double auxiliary tracks, by step and supplementary movements of a magnetic head (3) as appropriate, a positioning signal being recorded onto the tracks as they are formed. Data are then recorded onto the tracks. The required magnetic tracks are located, auxiliray tracks being located by supplementary movements of the head (3) and measurement of the read signal whose value determines the position of the magnetic head (3). The proposed device comprises a disk drive (1) with a step displacement mechanism (2), a magnetic head (3) with two recording/pick-up elements (4, 5) and a microdisplacement unit (6) rigidly mounted between the mechanism (2) and the magnetic head (3). The disk drive (1) is controlled by a main control unit (7), to which is connected an auxiliary control unit (8) to control the microdisplacement unit (6). The active components (4 , 5 ) of the elements (4, 5) are equal in width, that width being substantially equal to that of the magnetic track, while the gap between the active components (4 , 5 ) is equal to half their width.

Abstract translation: 所提出的方法包括通过适当地通过磁头（3）的步进和补充运动来预先对准盘载体的磁性层的磁化矢量，产生标准磁道，并在它们之间的双辅助轨道，定位信号为 当它们形成时记录在轨道上。 然后将数据记录到轨道上。 所需的磁迹位于，辅助轨迹通过磁头（3）的辅助运动和读取信号的测量来定位，其值确定磁头（3）的位置。 所提出的装置包括具有台阶位移机构（2）的磁盘驱动器（1），具有两个记录/拾取元件（4,5）的磁头（3）和刚性地安装在机构之间的微位移单元（6） （2）和磁头（3）。 磁盘驱动器（1）由主控制单元（7）控制，主控制单元（7）连接有辅助控制单元（8）以控制微位移单元（6）。 元件（4,5）的有源元件（4 1，5 1）的宽度相等，该宽度基本上等于磁道的宽度，而有效元件（4 <1）之间的间隙 >，5 <1）等于其宽度的一半。

公开(公告)号：WO1987005736A1

公开(公告)日：1987-09-24

申请号：PCT/US1987000395

申请日：1987-02-27

Applicant: VERBATIM CORPORATION

Inventor： VERBATIM CORPORATION ,  BOND, Charles, R.

IPC: G11B05/00

CPC classification number: G11B5/56 ,  G11B5/00

Abstract: A magnetic disk (10) includes a pair of azimuth test tracks (30, 32) of relatively narrow trackwise width located adjacent each other so that a magnetic head (28), the azimuth of which is to be measured, straddles both tracks at the same time. Each test track includes a recording pattern comprising a series of separate, uniformly spaced magnetic domains (34) of alternating orientation, the recording pattern on one track being in a particular phase relative to the recording pattern on the other track. Upon playback, the magnetic head produces a composite playback signal comprising a series of localized peaks, the time between adjacent peaks being functionally related to head azimuth.