公开(公告)号：US5132860A

公开(公告)日：1992-07-21

申请号：US421497

申请日：1989-10-13

申请人： Paul W. Von Stein

发明人： Paul W. Von Stein

IPC分类号： G11B5/024 ,  G11B5/325

CPC分类号： G11B5/325 ,  G11B5/024 ,  G11B5/0245

摘要： An erasure system for magnetic information storage media is disclosed by which magnetic media, such as computer, video and audio tapes, cassettes and discs, can be thoroughly erased. The system uses high energy product permanent magnets preferably positioned so that their poles repel one another to induce "bucking magnetic fields" having lines of force active in the three spatial planes and parallel or tangential to the recorded signal track on the media being erased. The DC magnetic field thus applied causes the DC erasure of the media. The AC erasure effect comes about through the relative movement of the media through fixed magnetic fields of opposite polarity, causing the magnetic media to be subjected to a reversing polarity of magnetic saturation. The magnet configurations can be adjusted for use on helically recorded magnetic media, in addition to cross-field and conventional recording techniques.

摘要翻译： 公开了一种用于磁信息存储介质的擦除系统，通过该擦除系统可以彻底地擦除诸如计算机，视频和音频磁带，盒式磁带和磁盘的磁性介质。 该系统使用高能产品永磁体，其优选地定位成使得它们的极彼此排斥以引起具有在三个空间平面中有效的力的“屈曲磁场”，并且与被擦除的介质上的记录信号轨道平行或相切。 这样应用的直流磁场导致介质的直流擦除。 AC擦除效应是通过介质通过相反极性的固定磁场的相对运动而产生的，导致磁介质受到磁饱和反转极性的影响。 除了跨场和常规记录技术之外，磁体配置可以调整用于螺旋记录磁介质。

公开(公告)号：US4146956A

公开(公告)日：1979-04-03

申请号：US831253

申请日：1977-09-07

申请人： Tatsuo Fujiwara

发明人： Tatsuo Fujiwara

IPC分类号： G11B5/325 ,  H01F13/00 ,  G11B5/42

CPC分类号： H01F13/006 ,  G11B5/325 ,  H01F13/003 ,  Y10T29/49004 ,  Y10T29/49034 ,  Y10T29/53165

摘要： Alternate S- and N-poles are disposed on a multipolar erasing head in the direction of a relative movement of the multipolar erasing head to a magnetic recording medium. The multipolar erasing head includes at least one region where the distances between adjacent magnetic poles of the same polarity are successively shortened in the direction for successively erasing the information recorded on the recording medium. A method and apparatus for manufacturing such an erasing head are also disclosed.

摘要翻译： 交替的S和N极在多极擦除头上沿着多极擦除头相对于磁记录介质的相对移动的方向设置。 多极擦除头包括至少一个区域，其中相同极性的相邻磁极之间的距离在连续擦除记录在记录介质上的信息的方向上被连续地缩短。 还公开了一种用于制造这种擦除头的方法和装置。

公开(公告)号：US3624572A

公开(公告)日：1971-11-30

申请号：US3624572D

申请日：1970-04-30

申请人： AMPEX

发明人： MALLINSON JOHN C ,  STEELE CHARLES W

IPC分类号： G11B5/127 ,  G11B5/325 ,  H01F1/00

CPC分类号： G11B5/325 ,  G11B5/127

摘要： Magnet device for generating a spatially periodic magnetic field of decreasing magnitude, while employing a direct current DC source, or permanent magnets, as the field generating source of power. The invention contemplates at least one plurality of poles of selected configuration, adapted to receive a magnetic medium in magnetic bridging relation. A second plurality of poles of selected configuration may be disposed in confronting relation to the first plurality, in selected orientation therewith, defining therebetween a gap of selected dimensions and shape for receiving therethrough the magnetic medium. Accordingly, a magnetic medium passing along a preselected path adjacent the single plurality of poles, or through the gap between the confronting plurality of poles, experiences a spatially varying, symmetrical, magnetic field of selectable constant or varying magnitude. Several arrangements and various modifications are contemplated within the invention concepts to effect the desired operating parameters.

公开(公告)号：US4706145A

公开(公告)日：1987-11-10

申请号：US779251

申请日：1985-09-23

申请人： Yasuyuki Hirabayashi ,  Juro Sugiura

发明人： Yasuyuki Hirabayashi ,  Juro Sugiura

IPC分类号： G11B5/325 ,  G11B5/127

CPC分类号： G11B5/325 ,  G11B5/00826 ,  G11B5/024

摘要： An erasing head for magnetic recording medium by magnetizing said recording medium with a permanent magnet is improved by a ferrite head body having a slider plane wider than a track to be erased, and, a magnetic metal thin film covering said slider plane. Said magnetic thin film solves the problem caused by undesired natural magnetization of a permanent magnet, so as to improve the erase ratio and S/N ratio, and the use of slider plane wider than that of a track simplifies producing process of the head since no step is provided between the track to be erased and neighboring track, and no polishing process for smoothing said step is required.

摘要翻译： 通过具有比要擦除的轨道更宽的滑块平面的铁氧体磁头本体和覆盖所述滑块平面的磁性金属薄膜来改善通过用永磁体磁化所述记录介质的磁记录介质的擦除头。 所述磁性薄膜解决了由永久磁铁不期望的自然磁化引起的问题，以提高擦除率和S / N比，并且使用比轨道宽的滑块平面简化了头的制造过程，因为没有 在要擦除的轨迹和相邻轨迹之间提供步骤，并且不需要用于平滑所述步骤的抛光处理。

公开(公告)号：US4613919A

公开(公告)日：1986-09-23

申请号：US449225

申请日：1982-12-13

申请人： Norio Miyatake ,  Mitsuaki Uenishi ,  Nobuo Kashimura ,  Keizo Ishiwatari

发明人： Norio Miyatake ,  Mitsuaki Uenishi ,  Nobuo Kashimura ,  Keizo Ishiwatari

IPC分类号： G11B5/325 ,  G11B5/12

CPC分类号： G11B5/325 ,  G11B5/00826 ,  G11B5/024

摘要： A magnetic erasing head for erasing a magnetic recording media such as magnetic tape. The device has a head surface defined to make sliding contact with the tape surface. The head surface includes a permanent magnet material and a high permeability material. The permanent magnet material defines the portion of the head surface extending from the inlet side toward the exit side thereof for the sliding tape and is magnetized to include portions which have alternate polarities and which have a field strength which gradually decrease from the inlet side to the exit side of the head surface. The high permeability material defines a portion of the head surface with a predetermined length from the exit side toward the inlet side and with a width of about one-half of the recording track of the tape. The high permeability material is positioned substantially in alignment with the center of the recording track. Thus, the magnetic tape erased by the erasing head does not induce secondary harmonic distortion due to mutual cancellation of residual magnetism.

摘要翻译： 用于擦除诸如磁带的磁记录介质的磁擦除头。 该装置具有限定为与带表面滑动接触的头表面。 头表面包括永磁材料和高磁导率材料。 永久磁铁材料限定了用于滑动带从其入口侧朝向出口侧延伸的头部表面的部分，并且被磁化以包括具有交替极性并且具有从入口侧逐渐减小的场强的部分 头表面的出口侧。 高磁导率材料限定头表面的从出口侧到入口侧的预定长度的一部分，并且具有磁带的记录轨道的约一半的宽度。 高磁导率材料基本上与记录轨道的中心对准。 因此，由擦除头擦除的磁带不会由于剩余磁性的相互抵消而引起二次谐波失真。

公开(公告)号：US4141052A

公开(公告)日：1979-02-20

申请号：US782896

申请日：1977-03-30

申请人： Naohiro Hanaoka

发明人： Naohiro Hanaoka

IPC分类号： G11B5/02 ,  G11B5/127 ,  G11B5/325 ,  G11B5/12

CPC分类号： G11B5/325 ,  G11B5/02 ,  G11B5/1272

摘要： An erase head comprises a magnetizable material which can be magnetized into a permanent magnet having N- and S-poles. The magnetization takes place in a manner such that one of the poles which is the first to be contacted by a magnetic medium to be erased is magnetized to produce a field strength which is less than the magnetic field strength produced by the other pole.

摘要翻译： 擦除头包括可磁化的材料，其可被磁化成具有N极和S极的永磁体。 磁化的方式使得首先被待擦除的磁性介质接触的磁极之一被磁化以产生小于由另一个极产生的磁场强度的场强。

公开(公告)号：US3351717A

公开(公告)日：1967-11-07

申请号：US47910565

申请日：1965-08-12

申请人： TELETYPE CORP

发明人： METZ JACK L

IPC分类号： G11B5/325

CPC分类号： G11B5/325

公开(公告)号：US11837263B1

公开(公告)日：2023-12-05

申请号：US17820731

申请日：2022-08-18

申请人： INTERNATIONAL BUSINESS MACHINES CORPORATION

发明人： David Harper ,  Hugo E. Rothuizen ,  Mark Alfred Lantz ,  Edwin Ralph Childers

IPC分类号： G11B5/024 ,  G11B5/008 ,  G11B5/325

CPC分类号： G11B5/024 ,  G11B5/00813 ,  G11B5/325

摘要： Provided are a tape erase element, tape erase device, and method for forming a tape erase element to erase content of a tape medium. The tape erase element comprises a housing forming a gap extending along a length of an outer surface of the housing. The gap extends from the outer surface of the housing to open into an inner space formed within the housing. A magnet is positioned within the inner space of the housing and having a surface extending across the gap. The magnet produces a magnetic flux that extends through a tape contact zone extending across a portion of the outer surface of the housing and the gap to erase content on the tape medium as the tape guide rollers guide the tape medium across the housing through the tape contact zone.

公开(公告)号：US20050243461A1

公开(公告)日：2005-11-03

申请号：US11119334

申请日：2005-04-28

申请人： Mitsuru Kitamura ,  Masahiko Katoh ,  Hitoshi Tamura ,  Hiroaki Uchiyama ,  Masashi Murayama ,  Migifumi Ikeda ,  Kazuo Sasaki ,  Shigeki Watabe

发明人： Mitsuru Kitamura ,  Masahiko Katoh ,  Hitoshi Tamura ,  Hiroaki Uchiyama ,  Masashi Murayama ,  Migifumi Ikeda ,  Kazuo Sasaki ,  Shigeki Watabe

IPC分类号： G11B5/024 ,  G11B5/325 ,  G11B5/596 ,  G11B19/20 ,  G11B21/10 ,  G11B17/02

CPC分类号： G11B19/20 ,  G11B5/0245 ,  G11B5/325 ,  G11B5/59633

摘要： Embodiments of the invention prevent a spindle motor from stopping rotation while data on a magnetic disk is being erased by using a permanent magnet. In one embodiment, data in the whole area of the magnetic disk is erased as a consequence of the magnetic disk rotating in the magnetic field of the permanent magnet located so as to face a part of the magnetic disk. A back yoke is located so as to face a base. The back yoke gives a magnetic force to the spindle motor in the opposite direction of the magnetic force of the erasing permanent magnet so that the fluid dynamic bearing spindle motor can retain the rotation as required without stopping rotation.

摘要翻译： 本发明的实施例通过使用永磁体来防止主轴电机停止旋转，同时磁盘上的数据被擦除。 在一个实施例中，磁盘的整个区域中的数据被擦除，因为磁盘在永久磁铁的磁场中旋转以便面对磁盘的一部分。 背轭被定位成面向底座。 后轭在与擦除永久磁铁的磁力相反的方向上向主轴电机施加磁力，使得流体动力轴承主轴电动机可以根据需要保持旋转而不停止旋转。

公开(公告)号：US4893208A

公开(公告)日：1990-01-09

申请号：US191950

申请日：1988-05-09

申请人： Richard J. McClure

发明人： Richard J. McClure

IPC分类号： G11B5/024 ,  G11B5/325

CPC分类号： G11B5/024 ,  G11B5/325

摘要： An improved form of magnetic erase head is provided which utilizes, in a magnetic erase head, leading and trailing "terminators", which suppress stray fields emanating from leading and trailing magnets.

摘要翻译： 提供了一种改进形式的磁性擦除头，其在磁性擦除头中利用前导和后部“终止器”，其抑制从前导磁铁和后磁体发出的杂散场。