| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 1 | 锰锌基铁氧体单晶材料和高频磁头 | CN98108325.0 | 1998-05-21 | CN1201990A | 1998-12-16 | 松井进; 常田富士夫 |
| 一种锰锌基铁氧体单晶材料,包括锰锌基铁氧体和基于所述锰锌基铁氧体量的1—7wt%的氧化镍。通过向锰锌基铁氧体添加特定量的氧化镍,在20MHz或更高的高频范围可将起始导磁率的降低减至最小并可将电阻率加大。具有本发明锰锌基铁氧体单晶材料制造的磁心小片的磁头显示减少涡电流损耗,并且特别改良在20MHz或更高的高频范围记录和读取特性。 | ||||||
| 2 | 磁头和磁记录再现装置 | CN00814080.4 | 2000-10-10 | CN1183516C | 2005-01-05 | 长谷川贤治; 村冈俊作; 夏井昭长; 小佐野浩一; 高桥健 |
| 提供一种磁头磨损小、静止持久时间长的磁头和备有使用该磁头的高速旋转磁鼓装置的磁记录再现装置。因此，在磁头中，将由一对衬底(1)和(3)、(5)和(7)夹持软磁金属材料构成的至少一个磁性膜(2、6)构成的磁芯半体(4、8)配置为由该磁芯半体的各个磁性膜应构成磁路的磁芯半体的端面之间相互对向来形成磁隙(9)，衬底的与磁带的滑动面的至少一部分由非磁性单晶铁氧体材料构成，该非磁性单晶铁氧体材料在上述滑动面的结晶面方位大致为{110}，并且<110>方向与磁头相对磁带的滑动方向大致平行。 | ||||||
| 3 | 磁头和磁记录再现装置 | CN00814080.4 | 2000-10-10 | CN1378684A | 2002-11-06 | 长谷川贤治; 村冈俊作; 夏井昭长; 小佐野浩一; 高桥健 |
| 提供一种磁头磨损小、静止持久时间长的磁头和备有使用该磁头的高速旋转磁鼓装置的磁记录再现装置。因此,在磁头中,将由一对衬底1和3、5和7夹持软磁金属材料构成的至少一个磁性膜2,6构成的磁芯半体4,8配置为由该磁芯半体的各个磁性膜应构成磁路的磁芯半体的端面之间相互对向来形成磁隙9,衬底的与磁带的滑动面的至少一部分由非磁性单晶铁氧体材料构成,该非磁性单晶铁氧体材料在上述滑动面的结晶面方位大致为{110},并且<110>;方向与磁头相对磁带的滑动方向大致平行。 | ||||||
| 4 | 磁头 | CN97125688.8 | 1997-12-25 | CN1186294A | 1998-07-01 | 田村孝; 二瓶尤卡里; 铃木笃; 松永融; 浦井彰 |
| 提供一种具有优秀的磨损特征和高的重放输出的磁头。磁头由一对磁芯二等分体构成,每个二等分体都在它的相应部位有一个单晶铁氧体,所述磁芯二等分体彼此对接接合,在这些磁芯二等分体的对接表面之间形成一个磁隙。单晶铁氧体具有它的媒体滑动表面,该表面与一个磁记录媒体滑动地接触,用作(411)平面;且还具有一个用作(122)平面的对接表面。 | ||||||
| 5 | Electromagnetic data storage devices having improved magnetic structure | US15037676 | 2014-11-19 | US09704512B2 | 2017-07-11 | Christopher Binns; David Binns; John Kinmont |
| The present invention relates to an electromagnetic data storage device comprising a data storage medium including a magnetic material, and a write head including an electromagnetic element operable to generate a magnetic field that impinges on a selected portion of the magnetic material of the data storage medium adjacent the write head, so as to affect the magnetization direction of the selected portion of magnetic material. The electromagnetic element includes a magnetic structure including a matrix material, and a plurality of magnetic nanoparticles held in the matrix material. | ||||||
| 6 | ELECTROMAGNETIC DATA STORAGE DEVICES | US15037676 | 2014-11-19 | US20160300588A1 | 2016-10-13 | Christopher Binns; David Binns; John Kinmont |
| The present invention relates to an electromagnetic data storage device comprising a data storage medium including a magnetic material, and a write head including an electromagnetic element operable to generate a magnetic field that impinges on a selected portion of the magnetic material of the data storage medium adjacent the write head, so as to affect the magnetisation direction of the selected portion of magnetic material. The electromagnetic element includes a magnetic structure including a matrix material, and a plurality of magnetic nanoparticles held in the matrix material. | ||||||
| 7 | Magnetic head with common seed layer for coil and pedestal | US10976370 | 2004-10-29 | US20060092563A1 | 2006-05-04 | Quang Le |
| A method for fabricating a coil and pedestal for a write head using a common seed layer is described. A nonmetallic gap layer is deposited on a planarized pole piece surface. Openings for the pole piece pedestal and the back gap pole piece are etched through the nonmetallic gap layer. A seed layer comprising a magnetic material is deposited on the etched gap layer. Preferably the coil is fabricated first on the planar surface of the seed layer. The coil structure, the pedestal pole piece, back-gap pole piece, side and center tap connections are fabricated on the same seed layer. The remaining seed layer is removed, the coil is encapsulated, the wafer is refilled with alumina and the wafer is planarized. The prior art process can be resumed at this point. Optionally a second seed layer such as copper (Cu) can be used. | ||||||
| 8 | Magnetic recording and reproducing system and magnetic recording medium used therein | US10290193 | 2002-11-08 | US06999255B2 | 2006-02-14 | Kiyomi Ejiri; Takeshi Harasawa |
| A magnetic recording and reproducing system, including recording a signal on a magnetic recording medium by an inductive head and reproducing the signal by a magneto resistance head. The gap length of the inductive head is 0.3 μm or less. The maximum particle diameter of ferromagnetic powder is from 1/10 to ½ of the gap length, the minimum particle diameter of the powder is from 1/100 to ⅕ of the gap length, and the thickness of a magnetic layer is from 1/10 to ½ of the gap length. The average particle size of the powder is from 10 to 35 nm, the tabular ratio is from 2 to 6, the squareness ratio of in-plane of the magnetic layer is from 0.5 to 0.9 in the longitudinal direction, and from 0.2 to 0.6 in the thickness direction, and the thickness of the magnetic layer is from 0.01 to 0.2 μm. | ||||||
| 9 | Magnetic head including a pole piece with soft magnetic particles dispersed therein and manufacturing method therefor | US32327 | 1998-02-27 | US6134079A | 2000-10-17 | Takao Koshikawa |
| A magnetic head including a magnetic pole piece for forming a recording gap, and a coil interlinked with the magnetic pole piece. The magnetic pole piece is obtained by first preparing a plating solution containing a first component for precipitating a substantially uniform soft magnetic layer of NiFe, for example, next dispersing a second component for precipitating soft magnetic particles of FeN, for example, in the plating solution, and finally simultaneously precipitating the soft magnetic layer and the soft magnetic particles to obtain the magnetic pole piece. The simultaneous precipitation of the soft magnetic layer and the soft magnetic particles may be effected by a dispersion plating method. According to this method, the soft magnetic particles formed of a material having a greater resistivity or a material having a greater saturation magnetic flux density can be mixed in a base layer (the soft magnetic layer) formed of a soft magnetic material that can be electroplated. Accordingly, it is possible to provide a magnetic head which can obtain a high writing ability and can be formed in a high-precision shape (that is, can obtain a high recording density to a magnetic recording medium). | ||||||
| 10 | Method and apparatus for analysis of magnetic characteristics of magnetic device, magnetic head, and magnetic recording and reproducing apparatus | US715774 | 1996-09-19 | US6072667A | 2000-06-06 | Yoshiaki Mizoh; Koichi Osano; Masaya Sakaguchi |
| A method and apparatus for analysis of magnetic characteristics of a magnetic device used for designing a magnetic head. The magnetic head has recording and reproducing characteristics and a recording and reproducing apparatus of magnetic characteristics. The apparatus for analysis of magnetic characteristics includes a data input part, a coupled analysis part, and a result output part. The data input part is provided with data related to the characteristics of substances composing the magnetic device, data related to the magnetic device divided into a plurality of parts, data concerning the boundary conditions for analysis of the magnetic device, and data concerning the boundary conditions for analysis of the magnetic field. In the analysis part, a stress distribution for each of the plurality of parts divided on the basis of the data related to the boundary conditions input from the data input part is obtained, and magnetic characteristics for each of the plurality of parts based on the data concerning the boundary conditions of the magnetic field and the stress distribution of the magnetic device are obtained, and magnetic characteristics of the whole magnetic device are obtained based on the magnetic characteristics of each of the plurality of parts. | ||||||
| 11 | Heat resistant, high saturation magnetic flux density film | US534872 | 1990-06-08 | US5879798A | 1999-03-09 | Toshio Kobayashi; Ryoichi Nakatani; Hitoshi Nakamura; Noriyuki Kumasaka |
| A heat resistant, high saturation magnetic flux density film, comprising, a plurality of crystal grains of ferromagnetic metal, and carbide or boride positioned around each of plurality of crystal grains. | ||||||
| 12 | Magnetic head | US914900 | 1997-08-20 | US5875081A | 1999-02-23 | Atsushi Suzuki; Masatoshi Hayakawa; Toru Matsunaga; Takashi Tamura; Akira Urai |
| A magnetic head having a pair of magnetic core halves integrally bonded to each other, each magnetic core half being formed by a single-crystal ferrite piece and a polycrystal ferrite piece bonded together to constitute a junction ferrite, with a magnetic gap being defined between abutting surfaces of the magnetic core halves. The single-crystal ferrite pieces are arranged towards the abutting surfaces of the magnetic core halves and the polycrystal ferrite pieces are arranged on the opposite side of the abutting surfaces with respect to the single-crystal ferrite pieces. Preferably, the surface of the single-crystal ferrite piece having sliding contact with the magnetic recording medium, the gap surface of the single-crystal ferrite piece and the surface of the single-crystal ferrite piece corresponding to the lateral surface of the magnetic head are the (211) plane, (111) plane and the (110) plane, respectively. The directions of the <100>crystal axes within the plane (100) are symmetrical to each other on both sides of the magnetic gap. The magnetic head is low in sliding noise and superior in electro-magnetic conversion characteristics. In addition, the magnetic recording medium is superior in abrasion characteristics since the partial advancing abrasion is prohibited from occurring on its surface configured to have sliding contact with the magnetic recording medium. | ||||||
| 13 | Method for manufacturing a magnetic head | US921592 | 1997-09-02 | US5806172A | 1998-09-15 | Masaru Okada; Yuichiro Murata; Hirofumi Ouchi |
| In relation to the magnetic head using a polycrystalline Mn-Zn ferrite as a core material, a magnetic head manufacturing method is provided for preventing the generation of the post-recording noise which is a pulse noise generated immediately after the completion of a current flow through the recording and reproducing coil. A fused core block is manufactured using Mn-Zn ferrite having a mean crystal grain size of equal to or less than 30 .mu.m as the core material of at least the recording and reproducing head and glass fusion using one type of glass, and the fused core block is annealed at a temperature equal to or higher than the strain point of the glass. | ||||||
| 14 | Magneto-optical recording apparartus including a magnetic head having a core composed of a single crystal ferrite material | US658399 | 1996-06-05 | US5627804A | 1997-05-06 | Kazuyoshi Ishii |
| A magneto-optical recording apparatus comprises an optical head for irradiating a magneto-optical recording medium with an optical beam, and a magnetic head for applying a magnetic field to the recording medium, a core of which is made of a single crystal ferrite material. In the magneto-optical recording apparatus, an easy magnetization direction based on a magnetic anisotropy of the single crystal ferrite material constituting a main pole portion of the core of the magnetic head may be arranged so as to be substantially coincident with a direction of the magnetic field applied to the magneto-optical recording medium, or with a direction of magnetization caused by a coil in a coil winding portion of the core of the magnetic head. | ||||||
| 15 | Floating magnetic head with reduced magnetostriction vibration noise | US240813 | 1994-05-11 | US5576912A | 1996-11-19 | Chiharu Mitsumata; Masanobu Yamazaki; Ryo Goto |
| In a floating magnetic head, noises produced at the time of reproduction are reduced, thereby enhancing the precision of detection of a track position. The floating magnetic head uses a monocrystal magnetic material constituting an electromagnetic transducer element, and a crystal orientation of the monocrystal magnetic material in the electromagnetic transducer element is parallel to a direction of travel of a medium. In the case of .vertline..lambda..sub.111 .vertline.+2.times.10.sup.-6 .ltoreq..vertline..lambda..sub.100 .vertline., the crystal orientation is in the range of a solid angle of 3.multidot.sin.theta..multidot.cos.phi. which satisfies 0.ltoreq..theta.<10 degrees and 0.ltoreq..phi..ltoreq.360 degrees around [111], and in the case of .vertline..lambda..sub.111 .vertline..gtoreq..vertline..lambda..sub.100 .vertline.+2.times.10.sup.-6, the crystal orientation is in the range of a solid angle of sin .theta..multidot.cos.phi. which satisfies 0.ltoreq..theta.<10 degrees and 0.ltoreq..phi..ltoreq.360 degrees around [100], where .lambda..sub.111 and .lambda..sub.100 respectively represent linear magnetostriction constant of the monocrystal magnetic material in directions <111> and <100>. The monocrystal magnetic material is a monocrystal MnZn ferrite whose chemical composition is represented by 20.ltoreq.MnO.ltoreq.40, 10.ltoreq.ZnO.ltoreq.25 50.ltoreq.Fe.sub.2 O.sub.3 .ltoreq.65 in terms of mol. %. | ||||||
| 16 | Magnetic head core arrangement having medium facing surface sides formed of single-crystal ferrite | US235798 | 1994-04-29 | US5515222A | 1996-05-07 | Seiji Kumagai; Junichi Honda; Yoshitomo Ito; Masatoshi Hayakawa; Toru Matsunaga; Mineo Yorizumi; Yoshito Ikeda |
| In a magnetic head having a pair of magnetic cores defining a magnetic gap in-between, a side of each magnetic core facing a recording medium is formed of a single-crystal ferrite, with the remaining portions of each magnetic core being formed of poly-crystal ferrite. The surface of the magnetic core facing the recording medium and the abutment surface of the magnetic core are the {100} plane and the {100} plane of the single-crystal ferrite, respectively. The magnetic head has excellent abrasion resistance and electro-magnetic conversion characteristics. | ||||||
| 17 | Magnetic head core having ferrite member reinforced by non-magnetic material | US258836 | 1994-06-13 | US5486969A | 1996-01-23 | Fuminori Takeya; Tomio Suzuki |
| A magnetic head core for a magnetic head including a first and a second ferrite member butted and bonded together to form an annular, closed magnetic path around a coil-winding groove, and a coil attached to a coil-winding portion of the first ferrite member. The first and second ferrite members provide a sliding surface to which a magnetic recording medium is opposed, and which extends across the first and second ferrite members. A non-magnetic material is secured to at least one of an inner surface and an outer surface of the coil-winding portion. The non-magnetic material is located below the sliding surface, and is spaced apart from the magnetic recording medium with the sliding surface disposed between the non-magnetic material and the magnetic recording medium. | ||||||
| 18 | Magnetic sintered composite material | US978564 | 1992-11-19 | US5350628A | 1994-09-27 | Koichi Kugimiya; Yasuhiro Sugaya; Osamu Inoue; Ken Hirota; Mitsuo Satomi |
| A magnetic material is provided which includes a discrete phase including grains made of a first substance which comprises a magnetic metal; and a continuous phase including a thin coating film made of a second substance which comprises a dielectric or insulating substance. The thin coating film is formed on the surface of the grains and has a mean thickness smaller than the mean particle size of the grains. The grains are separated substantially from each other by the thin coating film. | ||||||
| 19 | US65357876 | 1976-01-29 | US3982318B1 | 1992-02-04 | DOUGLAS J HENNENFENT; ALLAN L HOLMSTRAND | |
| 20 | Composite core magnetic transducer having a wedge shaped core portion | US374419 | 1989-06-30 | US5001588A | 1991-03-19 | Gary T. Smukal |
| A magnetic transducer and manufacturing method are described, where a transducer core is made from a composite block of magnetic material. The composite block has a first portion made of a first magnetic material, and a second portion made of a second magnetic material, the two block portions being integrally joined at corresponding planar surfaces. In the preferred embodiment, the first magnetic material is selected to have high granular density and other physical and magnetic properties which are necessary to obtain excellent transducing gap definition. The second magnetic material is selected to obtain high transducer performance. The composite block is machined around a periphery thereof at surfaces extending at oblique angles to said joined surfaces to provide a magnetic core having its first portion reduced to a wedge shaped portion. The wedge shaped portion has a first thusly obtained surface extending in a transducer-to-medium interface, a second surface extending in a transducing gap plane, and a third surface, corresponding to the integrally joined surfaces. The oblique angle between the second and third surface is selected along with other design parameters to obtain a desired small length of the wedge shaped portion in the transducer-to-medium contact area, while the total amount of the first magnetic material in the transducer is significantly reduced. | ||||||
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