公开(公告)号：US06633466B2

公开(公告)日：2003-10-14

申请号：US09737091

申请日：2000-12-14

申请人： Masaya Sakaguci ,  Toshio Fukazawa

发明人： Masaya Sakaguci ,  Toshio Fukazawa

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3106 ,  G11B5/3163 ,  G11B5/3903 ,  G11B5/3912 ,  G11B5/3932 ,  G11B5/40 ,  G11B2005/3996 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49067 ,  Y10T428/1143 ,  Y10T428/1164

摘要： A thin film head includes a GMR element formed of an antiferromagnetic layer, a pinning layer, a nonmagnetic conductive layer, a free magnetic layer, and a pair of the right and the left laminated longitudinal biasing layers. Each of the biasing layers contains a high coercivity ferromagnetic layer, a nonmagnetic layer and a low coercivity ferromagnetic layer provided on the free magnetic layer of the GMR element. The high coercivity ferromagnetic layer and low coercivity ferromagnetic layer are antiferromagnetically exchange-coupled via the nonmagnetic layer, and the high coercivity ferromagnetic layer and free magnetic layer located next to the high coercivity ferromagnetic layer are ferromagnetically coupled.

摘要翻译： 薄膜头包括由反铁磁层，钉扎层，非磁性导电层，自由磁性层和一对左右层叠纵向偏置层形成的GMR元件。 每个偏置层包含设置在GMR元件的自由磁性层上的高矫顽力铁磁层，非磁性层和低矫顽力铁磁层。 高矫顽力铁磁层和低矫顽力铁磁层通过非磁性层进行反铁磁交换耦合，位于高矫顽力铁磁层旁边的高矫顽力铁磁层和自由磁层被铁磁耦合。

公开(公告)号：US07103962B2

公开(公告)日：2006-09-12

申请号：US10413735

申请日：2003-04-15

申请人： Masaya Sakaguci ,  Toshio Fukazawa

发明人： Masaya Sakaguci ,  Toshio Fukazawa

IPC分类号： G11B5/127 ,  H04R31/00

CPC分类号： G11B5/3932 ,  G11B5/3903 ,  G11B2005/0016 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49067 ,  Y10T29/49155

摘要： A magnetoresistive thin film head comprises a magnetoresistive element including an antiferromagnetic layer, a pinned layer, a nonmagnetic conductive layer and a free magnetic layer, and a pair of the right and the left laminated transverse biasing layers, each including a nonmagnetic layer, a ferromagnetic layer and an antiferromagnetic layer, provided on the free magnetic layer constituting said magnetoresistive element. The layer thickness of said nonmagnetic layer has been established to a certain specific value so that magnetizing direction in said free magnetic layer opposing to the ferromagnetic layer via said nonmagnetic layer assumes a direction that is opposite to that of said ferromagnetic layer.

摘要翻译： 磁阻薄膜头包括包含反铁磁层，钉扎层，非磁性导电层和自由磁性层的磁阻元件，以及一对左右层压横向偏置层，每个包括非磁性层，铁磁性层 层和反铁磁层，设置在构成所述磁阻元件的自由磁性层上。 已经建立了所述非磁性层的层厚度到一定的特定值，使得通过所述非磁性层与所述铁磁层相对的所述自由磁性层中的磁化方向呈现与所述铁磁性层相反的方向。

公开(公告)号：US06574080B1

公开(公告)日：2003-06-03

申请号：US09721535

申请日：2000-11-22

申请人： Masaya Sakaguci ,  Toshio Fukazawa

发明人： Masaya Sakaguci ,  Toshio Fukazawa

IPC分类号： G11B539

CPC分类号： G11B5/3932 ,  G11B5/3903 ,  G11B2005/0016 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49067 ,  Y10T29/49155

摘要： A magnetoresistive thin film head comprises a magnetoresistive element including an antiferromagnetic layer, a pinning layer, a nonmagnetic conductive layer and a free magnetic layer, and a pair of the right and the left laminated transverse biasing layers, each including a nonmagnetic layer, a ferromagnetic layer and an antiferromagnetic layer, provided on the free magnetic layer constituting said magnetoresistive element. The layer thickness of said nonmagnetic layer has been established to a certain specific value so that magnetizing direction in said free magnetic layer opposing to the ferromagnetic layer via said nonmagnetic layer assumes a direction that is opposite to that of said ferromagnetic layer.

公开(公告)号：US5335127A

公开(公告)日：1994-08-02

申请号：US902580

申请日：1992-06-22

申请人： Yuji Nagata ,  Toshio Fukazawa ,  Satoru Mitani

发明人： Yuji Nagata ,  Toshio Fukazawa ,  Satoru Mitani

IPC分类号： G11B5/127 ,  G11B5/39 ,  G11B5/48

CPC分类号： G11B5/3925 ,  G11B5/3951 ,  G11B5/3977 ,  G11B5/4893

摘要： A lamination type magneto-resistive head used for a magnetic reproducing apparatus is formed by laminating two magneto-resistive heads, at least with the position of two magneto-resistive elements substantially shifted from each other for lamination and also enabling a plurality of track formats to be conformed, thus making it possible to assure stable outputs at a low frequency range.

摘要翻译： 用于磁再现装置的层叠型磁阻头通过层叠两个磁阻头而形成，至少两个磁阻元件的位置彼此基本上相互偏移以进行层压，并且还使得多个磁道格式能够 因此可以在低频范围内确保稳定的输出。

公开(公告)号：US5025342A

公开(公告)日：1991-06-18

申请号：US567812

申请日：1990-08-15

申请人： Yuji Nagata ,  Toshio Fukazawa

发明人： Yuji Nagata ,  Toshio Fukazawa

IPC分类号： G11B5/245 ,  G11B5/31 ,  G11B5/39

CPC分类号： G11B5/3903 ,  G11B5/2452 ,  G11B5/3116 ,  G11B5/3967

摘要： A magnetic head device of thin-film type having superior recording and reproducing characterisics. The magnetic head device has a non-magnetic substrate and lower and upper magnetic layers formed on the substrate. At least one of the magnetic layers has a double-layered structure composed of two soft magnetic layers. One of these soft magnetic layers, which is disposed at the inner side of the magnetic circuit, has a coercive force smaller than that of the other soft magnetic layer. The soft magnetic layer having the greater coercive force, at least at a portion thereof contactable with the recording medium, has a greater width than the soft magnetic layer of the smaller coercive force as viewed in the direction of the track.

公开(公告)号：US5469317A

公开(公告)日：1995-11-21

申请号：US255802

申请日：1994-06-07

申请人： Yuji Nagata ,  Toshio Fukazawa ,  Kumiko Wada ,  Yoshihiro Tosaki

发明人： Yuji Nagata ,  Toshio Fukazawa ,  Kumiko Wada ,  Yoshihiro Tosaki

IPC分类号： G11B5/29 ,  G11B5/39 ,  G11B5/127

CPC分类号： G11B5/3925 ,  G11B5/3961 ,  G11B5/295

摘要： In a magnetoresistive head capable of performing favorable magnetic recording and reproduction, an overlap width of a front yoke and a magnetoresistive element is always wider than an overlap width of a back yoke and the magnetoresistive element. Generally, the magnetoresistive head varies in its reproduction efficiency by the overlap width of the yoke and magnetoresistive element. In particular, the reproduction output is significantly affected by the overlap width of the front yoke and magnetoresistive element, and when the overlap width of the front yoke becomes narrower than the overlap width of the back yoke, the reproduction output tends to decrease abruptly. Therefore, by keeping the overlap width of the front yoke always wider than the other, a stable reproduction output can be achieved. In particular, an outstanding effect is obtained in a multi-channel magnetoresistive head containing multiple magnetoresistive elements in one head.

摘要翻译： 在能够进行有利的磁记录和再现的磁阻头中，前磁轭和磁阻元件的重叠宽度总是比后磁轭和磁阻元件的重叠宽度宽。 通常磁阻磁头通过磁轭和磁阻元件的重叠宽度在其再现效率上变化。 特别地，再现输出受到前磁轭和磁阻元件的重叠宽度的显着影响，并且当前磁轭的重叠宽度变得比背轭的重叠宽度窄时，再现输出趋于急剧下降。 因此，通过保持前轭的重叠宽度总是比另一方宽，可以实现稳定的再现输出。 特别地，在包含一个磁头中的多个磁阻元件的多通道磁阻磁头中获得了显着的效果。

公开(公告)号：US5095397A

公开(公告)日：1992-03-10

申请号：US559065

申请日：1990-07-30

申请人： Yuji Nagata ,  Toshio Fukazawa ,  Satoru Mitani

发明人： Yuji Nagata ,  Toshio Fukazawa ,  Satoru Mitani

IPC分类号： G11B5/31 ,  G11B5/245 ,  G11B5/39

CPC分类号： G11B5/3903 ,  G11B5/245

摘要： There is disclosed a thin film magnetic head which requires less recording current, and is capable of recording and reproducing with a high sensitivity. To achieve this magnetic head, a third yoke of a high permeability is bridged across a notched portion of a second yoke between front and back portions of the second yoke constituting part of a magnetic circuit. With this construction, the third yoke serves to extremely reduce a magnetic resistance between the front and back portions of the second yoke, so that the recording current can be smaller, thereby enhancing the recording efficiency.

公开(公告)号：US07137192B2

公开(公告)日：2006-11-21

申请号：US10640068

申请日：2003-08-13

申请人： Masaya Sakaguchi ,  Toshio Fukazawa

发明人： Masaya Sakaguchi ,  Toshio Fukazawa

IPC分类号： G11B5/127 ,  H04R31/00

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3106 ,  G11B5/3163 ,  G11B5/3903 ,  G11B5/3912 ,  G11B5/3932 ,  G11B5/40 ,  G11B2005/3996 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49067 ,  Y10T428/1143 ,  Y10T428/1164

摘要： A thin film head comprising a GMR element formed of an antiferromagnetic layer, a pinning layer, a nonmagnetic conductive layer and a free magnetic layer; and a pair of the right and the left laminated longitudinal biasing layers, each of the layers containing a hard magnetic layer, a nonmagnetic layer and a soft magnetic layer provided on said free magnetic layer of GMR element. Said hard magnetic layer and said soft magnetic layer are antiferromagnetically exchange-coupled via said nonmagnetic layer, and said hard magnetic layer and said free magnetic layer locating next to said hard magnetic layer are ferromagnetically coupled. The present invention contains also a method for manufacturing the thin film head.

摘要翻译： 一种薄膜头，包括由反铁磁层，钉扎层，非磁性导电层和自由磁性层形成的GMR元件; 以及一对左右的层叠纵向偏置层，每个层包含设置在所述GMR元件的自由磁性层上的硬磁性层，非磁性层和软磁性层。 所述硬磁性层和所述软磁性层经由所述非磁性层进行反铁磁交换耦合，并且位于所述硬磁性层旁边的所述硬磁性层和所述自由磁性层被铁磁耦合。 本发明还包括制造薄膜头的方法。

公开(公告)号：US6076932A

公开(公告)日：2000-06-20

申请号：US934867

申请日：1997-09-22

申请人： Shinji Uchida ,  Tsuguhiro Korenaga ,  Hiroyasu Tsuji ,  Shougo Nasu ,  Norimoto Nouchi ,  Toshio Fukazawa ,  Toshihiro Kuriyama ,  Yuji Matsuda

发明人： Shinji Uchida ,  Tsuguhiro Korenaga ,  Hiroyasu Tsuji ,  Shougo Nasu ,  Norimoto Nouchi ,  Toshio Fukazawa ,  Toshihiro Kuriyama ,  Yuji Matsuda

IPC分类号： G02B5/22 ,  G02F1/1335 ,  G11B7/135 ,  G02B27/00

CPC分类号： G11B7/1356 ,  G02B5/22 ,  G02F1/133512 ,  G11B7/1362

摘要： This invention provides a light absorber which can be used for optical equipment like optical-disk equipment and a liquid crystal display. The light absorber has a layered structure including a light absorbing layer and a transparent layer. The light absorbing layer absorbs a reflected light from the inside of the absorber as well as incident light into the absorber while the transparent layer helps attenuate the reflected light by interference of light. One of the light absorbing layers which is thicker than others may work as a shading layer for the incident light.

摘要翻译： 本发明提供一种可用于诸如光盘设备和液晶显示器之类的光学设备的光吸收体。 光吸收体具有包括光吸收层和透明层的层状结构。 光吸收层吸收来自吸收体的内部的反射光以及入射到吸收体的入射光，同时透明层通过光的干涉来帮助衰减反射光。 比其他光吸收层更厚的一个可以作为入射光的遮光层。

公开(公告)号：US5022141A

公开(公告)日：1991-06-11

申请号：US539738

申请日：1990-06-18

申请人： Yuji Nagata ,  Toshio Fukazawa ,  Kumiko Wada ,  Yoshihiro Tosaki

发明人： Yuji Nagata ,  Toshio Fukazawa ,  Kumiko Wada ,  Yoshihiro Tosaki

IPC分类号： G11B5/31 ,  H01F41/04

CPC分类号： H01F41/041 ,  G11B5/3163 ,  Y10T29/49062 ,  Y10T29/49064

摘要： A method of manufacturing a multiturn coil and a thin film magnetic head including a multiturn coil.This multiturn coil manufacturing method includes the following steps. First a laminate made up of conducting layers and insulating layers for coil is formed on a base member on a substrate and having a given inclination. Then this laminate is formed into a loop shape with a space or discontinuity thereon. In the next step, the upper part of the laminate on opposite sides of the space is removed to form a flat surface parallel to the substrate in which the ends of all the conducting layers are exposed. Finally, film conductive strips are connected between these exposed portions across the discontinuity to complete a multiturn coil.