公开(公告)号：US06278577B1

公开(公告)日：2001-08-21

申请号：US08438319

申请日：1995-05-10

申请人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Jules David Friedman ,  Vincent Noel Kahwaty

发明人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Jules David Friedman ,  Vincent Noel Kahwaty

IPC分类号： G11B5265

CPC分类号： G11B5/3967 ,  G11B5/2652 ,  G11B5/3103 ,  G11B5/4893 ,  G11B5/584

摘要： A multi-element read-write magnetic recording head for recording information on a magnetic tape and for reading recorded information therefrom is provided. The recording head comprises an equal number of associated read elements and write elements to form a two-gap recording head comprising pairs of read and write elements. The two-gap recording head further comprises a first module and a second module, the first and second modules each comprising a plurality of read and write head elements. A first group of read and write heads is configured to perform in a forward direction of movement of the magnetic tape and a second group of read and write heads is configured to perform in a reverse direction of movement of the magnetic tape. One of the modules contains an equal number of forward read heads and reverse write heads and the other of the modules contains an equal number of reverse read heads and forward write heads, to provide decoupling of reading and writing functions and to enable servoing by a given read element of a write element associated therewith. Asymmetry of the magnetic recording head is provided by offsetting leads to the read elements in a given module from leads to said write elements in the same module, while maintaining orthogonality between read and write element leads near the read and write elements. The asymmetry minimizes both inductive and capacitive feedthrough into adjacent readers. As a consequence, noise produced during the writing process is reduced, providing an improved signal-to-noise ratio and thereby permitting same gap servoing.

摘要翻译： 提供了一种用于在磁带上记录信息并从其读取记录信息的多元素读写磁记录头。 记录头包括相等数量的相关联的读取元件和写入元件，以形成包括读取和写入元件对的双隙记录头。 双隙记录头还包括第一模块和第二模块，第一和第二模块各自包括多个读写头元件。 第一组读写头被配置为在磁带的向前移动方向上执行，并且第二组读写头被配置为在磁带的相反移动方向上执行。 其中一个模块包含相同数量的正向读取头和反向写入头，另一个模块包含相等数目的反向读取头和正向写入头，以提供读取和写入功能的去耦合，并使得能够通过给定的 读取与之相关联的写元件的元素。 通过将给定模块中的读取元件的引线偏移到同一模块中的引线到所述写入元件，同时保持读取和写入元件附近的读取和写入元件引线之间的正交性，来提供磁记录头的不对称性。 不对称性使电感和电​​容馈通最小化到相邻的读取器中。 因此，在写入处理期间产生的噪声减小，提供了改善的信噪比，从而允许相同的间隙伺服。

公开(公告)号：US5713122A

公开(公告)日：1998-02-03

申请号：US449382

申请日：1995-05-23

申请人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Vincent Noel Kahwaty

发明人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Vincent Noel Kahwaty

IPC分类号： G11B5/39 ,  G11B5/008 ,  G11B5/31 ,  G11B5/48 ,  G11B5/55 ,  G11B5/58 ,  G11B5/584 ,  G11B5/596 ,  G11B25/06 ,  G11B5/127

CPC分类号： G11B5/00813 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3932 ,  G11B5/3961 ,  G11B5/399 ,  G11B5/488 ,  G11B5/4893 ,  G11B5/58 ,  G11B5/584 ,  G11B5/59683 ,  G11B5/3163 ,  G11B5/5508 ,  Y10T29/49034 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49067

摘要： A magnetoresistive sensor design and fabrication process that provides improved microtrack profile linearity for servo elements while simultaneously providing stable and linear data sensing elements suitable for high density tape head applications. The stability and uniformity of both data and servo sensor elements is enhanced through the use of a grating profile under both the soft film biased magnetoresistive sensor layer and the hard bias stabilizing magnets. Processing steps are eliminated by replicating the grating pattern for the servo sensor elements through a thick layer of alumina or silicon dioxide. The outer read shield is removed from the servo elements using a stripping process that eliminates structural damage arising from alumina pinholes. Both element types are free of significant Barkhausen noise and instability because of the grating-stabilized domains in both the active magnetoresistive regions and the passive hard-biasing regions of each sensor. Each servo sensor is disposed at a greater distance from the single shield to optimize the microtrack profile. The resulting reduction in servo sensor frequency response leaves sufficient bandwidth for precise servo positioning.

摘要翻译： 磁阻传感器设计和制造过程，为伺服元件提供改进的微轨迹轮廓线，同时提供适用于高密度磁带头应用的稳定和线性数据传感元件。 通过在软膜偏置磁阻传感器层和硬偏置稳定磁体两者下使用光栅轮廓来增强数据和伺服传感器元件的稳定性和均匀性。 通过将氧化铝或二氧化硅的厚层复制用于伺服传感器元件的光栅图案来消除加工步骤。 使用消除氧化铝针孔造成的结构损坏的剥离过程，从伺服元件中除去外部读取屏蔽层。 由于在每个传感器的有源磁阻区域和被动硬偏置区域中的光栅稳定域，这两种元件类型都没有显着的Barkhausen噪声和不稳定性。 每个伺服传感器设置在与单个屏蔽件更远的距离处，以优化微轨道轮廓。 伺服传感器频率响应的减少导致了精确伺服定位的足够带宽。

公开(公告)号：US5652015A

公开(公告)日：1997-07-29

申请号：US685996

申请日：1996-07-25

申请人： Joseph Adam Aboaf ,  Edward Virgil Dennison ,  Jules David Friedman ,  Vincent Noel Kahwaty ,  Herman Carl Kluge

发明人： Joseph Adam Aboaf ,  Edward Virgil Dennison ,  Jules David Friedman ,  Vincent Noel Kahwaty ,  Herman Carl Kluge

IPC分类号： G11B5/31 ,  G11B5/48 ,  B05D5/12

CPC分类号： G11B5/3183 ,  G11B5/3103 ,  G11B5/4813 ,  G11B5/488

摘要： An arbitrary pattern write head assembly for writing timing-based servo patterns on magnetic storage media is provided, comprising: (a) a first pole piece comprising a substrate comprising a magnetic material, said substrate having a major surface; (b) a plurality of electrically conducting windings formed on the major surface; and (c) a second pole piece formed on the substrate, with a portion thereof formed above the plurality of electrically conducting windings and electrically insulated therefrom, the second pole piece having at least one opening therethrough defining a gap above the electrically conducting windings and the substrate, the second pole piece comprising at least two layers, each layer comprising a magnetic material. A method of batch fabricating servo writer heads is also provided for batch fabrication of servo writer heads at a very low cost. The method enables fabrication of heads capable of azimuthal recording commonly practiced in the video recording art. Hard nitrided Fe/NiFe poletip materials are used to minimize wear in tape head use.

摘要翻译： 提供了一种用于在磁存储介质上写入基于时序的伺服图案的任意图形写头组件，包括：（a）第一极片，其包括包括磁性材料的衬底，所述衬底具有主表面; （b）形成在主表面上的多个导电绕组; 和（c）形成在所述基板上的第二极靴，其一部分形成在所述多个导电绕组上方并与其电绝缘，所述第二极靴具有至少一个穿过所述导电绕组上方的间隙的开口， 衬底，所述第二极片包括至少两层，每层包括磁性材料。 还提供了批量制造伺服写入头的方法，用于以非常低的成本批量制造伺服写入头。 该方法能够制造能够在视频记录领域中通常实行的方位记录的头部。 使用硬质氮化Fe / NiFe poletip材料来减少磁带头使用中的磨损。

公开(公告)号：US6038110A

公开(公告)日：2000-03-14

申请号：US762826

申请日：1996-12-06

申请人： Joseph Adam Aboaf ,  Thomas Beaulieu ,  Vincent Noel Kahwaty, deceased ,  Mohamad Towfik Krounbi ,  David John Seagle

发明人： Joseph Adam Aboaf ,  Thomas Beaulieu ,  Vincent Noel Kahwaty, deceased ,  Mohamad Towfik Krounbi ,  David John Seagle

IPC分类号： G11B5/008 ,  G11B5/31 ,  G11B5/127 ,  G11B5/147

CPC分类号： G11B5/3109 ,  G11B5/00813 ,  G11B5/3146 ,  G11B5/3163 ,  Y10T29/49044

摘要： A thin-film magnetic head includes a substrate having first and second magnetic layers disposed above the substrate and formed as a laminated sequence of magnetic sub-layers. The first and second magnetic layers have corresponding first ends representing a pole tip region of the head, corresponding second ends representing a back gap region of the head, and corresponding intermediate portions representing an intermediate region of the head between the pole tip region and the back gap region. The first and second magnetic layers are joined together in physical contact at the back gap region and are spaced from one another at the pole tip region and at the intermediate region. A nonmagnetic gap layer is disposed between the first and second magnetic layers at the pole tip region. A magnetic coil structure is disposed between the first and second magnetic layers at the intermediate region. The second magnetic layer has a sloped region wherein the second magnetic layer slopes away from the first magnetic layer behind the pole tip region to form a space for the magnetic coil structure. The sloped region of the second magnetic layer may have less magnetic permeability than other portions of the second magnetic layer. A third magnetic layer is thus disposed on the second magnetic layer and extends from the back gap region to cover at least the sloped region of the second magnetic layer.

摘要翻译： 薄膜磁头包括具有设置在基板上方的第一和第二磁性层并形成为磁性子层的层叠序列的基板。 第一和第二磁性层具有相应的第一端表示头部的极尖区域，对应的第二端表示头部的后部间隙区域，以及相应的中间部分，表示头部区域和背部之间的中间区域 间隙区域。 第一和第二磁性层在后隙区域处物理接触地接合在一起，并且在极尖区域和中间区域处彼此间隔开。 非磁性间隙层设置在极尖区域的第一和第二磁性层之间。 磁性线圈结构设置在中间区域的第一和第二磁性层之间。 所述第二磁性层具有倾斜区域，其中所述第二磁性层在所述极尖区域的后方倾斜离开所述第一磁性层，以形成用于所述磁性线圈结构的空间。 第二磁性层的倾斜区域的磁导率可以比第二磁性层的其它部分低。 因此，第三磁性层被布置在第二磁性层上，并且从后间隙区域延伸至至少覆盖第二磁性层的倾斜区域。

公开(公告)号：US06038106A

公开(公告)日：2000-03-14

申请号：US438317

申请日：1995-05-10

申请人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Jules David Friedman ,  Vincent Noel Kahwaty ,  Herman Carl Kluge, II

发明人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Jules David Friedman ,  Vincent Noel Kahwaty ,  Herman Carl Kluge, II

IPC分类号： G11B5/11 ,  G11B5/17 ,  G11B5/31 ,  G11B5/39 ,  G11B5/40

CPC分类号： G11B5/3903 ,  G11B5/3146 ,  G11B5/3967 ,  G11B5/40 ,  G11B5/11 ,  G11B5/17 ,  G11B5/3133 ,  G11B5/3163

摘要： A magneto-resistive read/write tape head is provided for reading and writing to tape media along a tape head face. The tape head comprises a plurality of modules, each module comprising a read element and a write element spaced apart and terminating at the tape head face and formed over a substrate. The read element comprises a soft film bias layer and a hard film bias layer butted against the SFB layer. The write element comprises two pole tips spaced apart by a gap. The tape head further includes a plurality of activating conducting coil turns operatively associated with the write element and covered by a cross-linked photoresist and positioned between the gap and one of the pole tips and set back from the tape head face. The tape head has at least one of the following elements: (a) a wear shield between the read element and the write element for limiting wear of the gap between the two pole tips, the wear shield being grounded for decoupling read and write functions of the tape head, for allowing same module read/servo/write functions simultaneously, and for grounding static charge from the tape media; (b) a layer of electrically conductive and corrosion-resis tant material, such as rhodium, under the hard film bias layer to reduce its resistance; and (c) a non-activating dummy coil turn closer to the pole tips than the activating coil turns for defining a forward termination of the cross-linked photoresist between the activating coil turns and the tape head face to thereby provide improved ease of processability.

摘要翻译： 提供磁阻读/写磁带头，用于沿着磁带头面读取和写入磁带介质。 磁带头包括多个模块，每个模块包括读取元件和间隔开并终止于磁带头表面并形成在衬底上的写入元件。 读取元件包括与SFB层对接的软膜偏置层和硬膜偏置层。 写入元件包括由间隙隔开的两个极尖。 带头还包括与写入元件可操作地相关联并被交联光致抗蚀剂覆盖的多个激活导电线圈，并且定位在间隙和极尖之一之间并从磁带头表面返回。 带头具有以下元件中的至少一个：（a）读取元件和写入元件之间的耐磨屏蔽件，用于限制两个极尖之间的间隙的磨损，所述耐磨屏蔽层被接地，用于解耦读取和写入功能 磁带头，用于同时允许相同的模块读/写/写功能，并用于从磁带介质接地静电; （b）在硬膜偏压层下面的一层导电和耐腐蚀材料，如铑，以降低其电阻; 和（c）不活动的虚拟线圈比活动线圈转动更靠近磁极尖端，用于限定激活线圈匝和磁带头表面之间的交联光致抗蚀剂的前端，从而提供改进的可加工性。

公开(公告)号：US5745978A

公开(公告)日：1998-05-05

申请号：US799716

申请日：1997-02-12

申请人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Vincent Noel Kahwaty

发明人： Joseph Adam Aboaf ,  Edward Virgil Denison ,  Vincent Noel Kahwaty

IPC分类号： G11B5/39 ,  G11B5/008 ,  G11B5/31 ,  G11B5/48 ,  G11B5/55 ,  G11B5/58 ,  G11B5/584 ,  G11B5/596 ,  G11B25/06 ,  G11B5/127

CPC分类号： G11B5/00813 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3932 ,  G11B5/3961 ,  G11B5/399 ,  G11B5/488 ,  G11B5/4893 ,  G11B5/58 ,  G11B5/584 ,  G11B5/59683 ,  G11B5/3163 ,  G11B5/5508 ,  Y10T29/49034 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49067

摘要： A magnetoresistive sensor design and fabrication process that provides improved microtrack profile linearity for servo elements while simultaneously providing stable and linear data sensing elements suitable for high density tape head applications. The stability and uniformity of both data and servo sensor elements is enhanced through the use of a grating profile under both the soft film biased magnetoresistive sensor layer and the hard bias stabilizing magnets. Processing steps are eliminated by replicating the grating pattern for the servo sensor elements through a thick layer of alumina or silicon dioxide. The outer read shield is removed from the servo elements using a stripping process that eliminates structural damage arising from alumina pinhole's. Both element types are free of significant Barkhausen noise and instability because of the grating-stabilized domains in both the active magnetoresistive regions and the passive hard-biasing regions of each sensor. Each servo sensor is disposed at a greater distance from the single shield to optimize the microtrack profile. The resulting reduction in servo sensor frequency response leaves sufficient bandwidth for precise servo positioning.

摘要翻译： 磁阻传感器设计和制造过程，为伺服元件提供改进的微轨迹轮廓线，同时提供适用于高密度磁带头应用的稳定和线性数据传感元件。 通过在软膜偏置磁阻传感器层和硬偏置稳定磁体两者下使用光栅轮廓来增强数据和伺服传感器元件的稳定性和均匀性。 通过将氧化铝或二氧化硅的厚层复制用于伺服传感器元件的光栅图案来消除加工步骤。 使用消除了氧化铝针孔的结构损坏的剥离过程，从伺服元件中除去外部读取屏蔽层。 由于在每个传感器的有源磁阻区域和被动硬偏置区域中的光栅稳定域，这两种元件类型都没有显着的Barkhausen噪声和不稳定性。 每个伺服传感器设置在与单个屏蔽件更远的距离处，以优化微轨道轮廓。 伺服传感器频率响应的减少导致了精确伺服定位的足够带宽。