公开(公告)号：US4890379A

公开(公告)日：1990-01-02

申请号：US278172

申请日：1988-12-01

申请人： Hiroshi Yohda ,  Ken Takahashi ,  Eisuke Sawai ,  Syunsaku Muraoka ,  Keita Ihara

发明人： Hiroshi Yohda ,  Ken Takahashi ,  Eisuke Sawai ,  Syunsaku Muraoka ,  Keita Ihara

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

CPC分类号： G11B5/3103 ,  G11B5/127 ,  G11B5/147 ,  G11B5/1475 ,  G11B5/3163 ,  Y10T29/49034 ,  Y10T29/49057

摘要： A method of manufacturing a magnetic head includes fabricating a magnetic block having a lamination of magnetic alloy films and nonmagnetic substrates, and cutting the magnetic block into two bars to obtain magnetic core halves. A nonmagnetic film is formed on a surface of each of the core halves. The core halves are joined by adjoining the surfaces having the nonmagnetic film and then heating the thus adjoined core halves. Additionally, a magnetic field is applied rotating in a plane parallel to a plane of the magnetic alloy films. The joined core halves is then cut into a specified width, and a wire-winding window is machined therein.

摘要翻译： 一种制造磁头的方法包括制造具有磁性合金膜和非磁性基底的层压的磁性块，并将该磁性块切割成两个棒以获得磁性核半部。 在每个核心半部的表面上形成非磁性膜。 芯半部通过邻接具有非磁性膜的表面连接，然后加热这样相邻的芯半部。 另外，在与磁性合金膜的平面平行的平面内旋转施加磁场。 然后将连接的半芯片切割成指定的宽度，并在其中机加工线绕制窗口。

公开(公告)号：US4985796A

公开(公告)日：1991-01-15

申请号：US359312

申请日：1989-05-31

申请人： Keita Ihara ,  Hiroshi Yohda ,  Eisuke Sawai ,  Ken Takahashi

发明人： Keita Ihara ,  Hiroshi Yohda ,  Eisuke Sawai ,  Ken Takahashi

IPC分类号： G11B5/133 ,  G11B5/127 ,  G11B5/187

CPC分类号： G11B5/127 ,  G11B5/1875

摘要： There is disclosed herein a magnetic head comprising a ring-like magnetic core composed of first and second magnetic core halves made of a ferrite and held in abutment against each other so as to form a magnetic gap therebetween and an elongated tape-contact surface extending across the magnetic gap. The magnetic core has in the tape-contact surface a channel formed to as to extend in the direction across the magnetic gap and the channel is filled with a magnetic metal material having a high-saturation magnetization. Preferably, the channel has a substantially V-shaped cross section. The magnetic gap exposed on the tape-contact surface is surrounded by the magnetic metal material and non-magnetic glass members provided at both ends of the magnetic gap. The non-magnetic glass members are provided so that the track width is constant from the tape-contact surface to an upper end of a winding hole of the ring-like magnetic core.

公开(公告)号：US4745506A

公开(公告)日：1988-05-17

申请号：US89945

申请日：1987-08-26

申请人： Kazuo Nakamura ,  Seishi Sasaki ,  Ken Takahashi ,  Hiroshi Yohda ,  Nobuyuki Kaminaka

发明人： Kazuo Nakamura ,  Seishi Sasaki ,  Ken Takahashi ,  Hiroshi Yohda ,  Nobuyuki Kaminaka

IPC分类号： G11B5/127 ,  G11B5/17 ,  G11B5/31 ,  G11B5/147 ,  G11B5/187 ,  G11B5/23

CPC分类号： G11B5/1278 ,  G11B5/17 ,  G11B5/3103

摘要： A perpendicular magnetic head of high recording and reproducing efficiency which integrally incorporates a step-up transformer. A main pole for picking up a reproduce magnetic flux from a recording medium and applying recording magnetic field thereto is formed of a magnetic thin film. A signal winding formed of a thin film is disposed in the immediate vicinity of the forward end of the main pole so as to have a high conversion sensitivity per turn with respect to the reproduce magnetic flux from the recording medium. The signal winding which itself constitutes a closed circuit interlinks a magnetic path of the step-up transformer, thereby forming a primary winding of the transformer. A secondary winding from which head output is taken out is wound in the magnetic path of the transformer.

摘要翻译： 具有高记录和再现效率的垂直磁头，其整体结合了升压变压器。 用于从记录介质拾取再现磁通并向其施加记录磁场的主极由磁性薄膜形成。 由薄膜形成的信号绕组设置在主极的前端附近，以便相对于来自记录介质的再现磁通具有高的每转转换灵敏度。 本身构成闭路的信号绕组使升压变压器的磁路相互连接，从而形成变压器的初级绕组。 取出头部输出的次级绕组缠绕在变压器的磁路中。

公开(公告)号：US4897748A

公开(公告)日：1990-01-30

申请号：US175241

申请日：1988-03-30

申请人： Ken Takahashi ,  Hiroshi Yohda ,  Nobuyuki Kaminaka

发明人： Ken Takahashi ,  Hiroshi Yohda ,  Nobuyuki Kaminaka

IPC分类号： G11B5/127 ,  G11B5/147 ,  G11B5/187 ,  G11B5/48 ,  G11B5/53

CPC分类号： G11B5/4893 ,  G11B5/147 ,  G11B5/187 ,  G11B5/531

摘要： A magnetic head for the video tape recorder of azimuth recording type, which features an improved S/N ratio in the overwrite region and assures a high picture quality has a magnetic core for defining a magnetic gap in this head which is made of a plurality of magnetic materials differing in saturation flux density in the direction of track width, with the material having a higher saturation flux density being disposed on the overwriting side of the head. This arrangement permits recording to a greater depth than the depth of magnetization by previous recording to assure an improved picture quality with a higher S/N ratio.

摘要翻译： 用于方位记录型磁带录像机的磁头，其在改写区域具有改善的S / N比并且确保高画质具有用于限定该磁头中的磁隙的磁芯，该磁芯由多个 在磁道宽度方向上的饱和磁通密度不同的磁性材料，具有较高饱和磁通密度的材料设置在磁头的重写侧。 这种布置允许通过先前的记录来记录比磁化深度更大的深度，以确保具有更高S / N比的改善的图像质量。

公开(公告)号：US4985797A

公开(公告)日：1991-01-15

申请号：US326042

申请日：1989-03-17

申请人： Hiroshi Yohda ,  Yasushi Inoue

发明人： Hiroshi Yohda ,  Yasushi Inoue

IPC分类号： G11B5/127 ,  G11B5/11 ,  G11B5/147

CPC分类号： G11B5/1475 ,  G11B5/11

摘要： A ring-shaped magnetic head includes magnetic cores made of a metallic magnetic material having a gap therebetween and being held between non-magnetic substrates. A metallic thin film is provided bridging the gap between the magnetic cores for establishing an electrical connection between the magnetic cores. The metallic thin film is formed on a surface of the magnetic head which is opposite to a surface for contacting a magnetic recording medium.

公开(公告)号：US5508945A

公开(公告)日：1996-04-16

申请号：US323606

申请日：1994-10-17

申请人： Yoshiaki Mizoh ,  Hiroshi Yohda ,  Hidetoshi Kotera ,  Hiromi Kita

发明人： Yoshiaki Mizoh ,  Hiroshi Yohda ,  Hidetoshi Kotera ,  Hiromi Kita

IPC分类号： G11B15/61 ,  G11B33/10 ,  G06F17/00

CPC分类号： G11B15/61 ,  G11B33/10

摘要： A levitation phenomenon analyzer includes: a data input portion for reading data on fluid and structural components and minute structures of a device; a levitation analysis portion for solving basic simultaneous equations of the fluid and the structural components on the basis of the data; and a result output portion for outputting analytical results of the levitation analysis portion; wherein by regarding a flow path of the fluid for levitation analysis as a mean thickness of a air film or regarding the pressure of the fluid as a mean pressure, shapes of the minute structures which are independent of coordinates of nodal points are handled.

摘要翻译： 悬浮现象分析仪包括：数据输入部分，用于读取关于流体的数据和结构部件以及装置的微小结构; 悬浮分析部分，用于基于数据求解流体和结构部件的基本联立方程; 以及结果输出部分，用于输出悬浮分析部分的分析结果; 其中，通过将用于悬浮分析的流体的流路作为空气膜的平均厚度或关于流体的压力作为平均压力，处理与节点坐标无关的微小结构的形状。

公开(公告)号：US5065267A

公开(公告)日：1991-11-12

申请号：US554928

申请日：1990-07-20

申请人： Hiroshi Yohda

发明人： Hiroshi Yohda

IPC分类号： G11B5/105 ,  G11B5/53

CPC分类号： G11B5/105 ,  G11B5/53

摘要： The multi-track head includes more than one head chip attached onto one head base. The head chips are respectively attached onto the divided front end parts of the head base, and the relative positions of the front end parts of the head base are adjusted so that the positions of the gap ends in the head chips are set precisely to a predetermined value, before the head chips are fixed. For these reasons, it is not necessary to adjust the position of each head chip after the head chips are arranged in a rotary cylinder. It is therefore possible to obtain a head having a size which can be accurately adjusted, regardless of the size of the head chip, even when the head chip is extremely small. A bonding material is provided between the divided front end parts to secure the front end parts and the chips mounted thereon in place after they have been displaced to align them with recording medium track locations.

摘要翻译： 多轨头包括多个头部芯片，其附接到一个头部基座上。 将头部芯片分别安装在头部基座的分割前端部分上，并且调节头部基座的前端部分的相对位置，使得头部芯片中的间隙的位置精确地设定为预定的 价值，前头芯片固定。 由于这些原因，在头部芯片布置在旋转圆筒中之后，不需要调整每个头部芯片的位置。 因此，即使头部芯片非常小，也可以获得具有能够精确调整的尺寸的头部，而与头部芯片的尺寸无关。 在分开的前端部件之间设置接合材料，以将前端部件和安装在其上的芯片固定在适当的位置，使其与记录介质轨迹位置对准。

公开(公告)号：US06804072B1

公开(公告)日：2004-10-12

申请号：US09856782

申请日：2001-05-25

申请人： Hiroshi Yohda ,  Masaru Higashionji ,  Haruo Isaka ,  Hideaki Mukae ,  Kouhei Baba ,  Kazunori Umee

发明人： Hiroshi Yohda ,  Masaru Higashionji ,  Haruo Isaka ,  Hideaki Mukae ,  Kouhei Baba ,  Kazunori Umee

IPC分类号： G11B2736

CPC分类号： G11B27/36 ,  G11B5/0086 ,  G11B5/455 ,  G11B5/53 ,  G11B15/087 ,  G11B15/125 ,  G11B15/1808 ,  G11B27/34 ,  G11B2220/90

摘要： A clogging detector used for a VTR to check the recording state of a recording head without using the reproducing head. A test signal of a lower frequency than the erasing frequency is recorded before and after an information signal by means of an erasing head. Before and after recording the information signal by means of the recording head, the test signal is reproduced, the reproduction output is detected by a detecting circuit, and the level of the output is compared with a preset level by a comparing circuit. When the level is lower than the preset level, a warming is issued from a warming circuit, thus preventing a recording failure due to the clogging of the head.

摘要翻译： 用于VTR的堵塞检测器来检查记录头的记录状态，而不使用再现头。 通过擦除头在信息信号之前和之后记录比擦除频率低的测试信号。 在通过记录头记录信息信号之前和之后，再现测试信号，由检测电路检测再现输出，并通过比较电路将输出电平与预设电平进行比较。 当电平低于预设电平时，从加热电路发出升温，从而防止由于头部堵塞而引起的记录故障。

公开(公告)号：US06690879B2

公开(公告)日：2004-02-10

申请号：US09784855

申请日：2001-02-16

申请人： Hirofumi Uchida ,  Masaru Higashionji ,  Takeshi Otsuka ,  Keiichi Ishida ,  Hiroshi Yohda

发明人： Hirofumi Uchida ,  Masaru Higashionji ,  Takeshi Otsuka ,  Keiichi Ishida ,  Hiroshi Yohda

IPC分类号： H04N591

CPC分类号： G11B21/21 ,  G11B5/0086 ,  G11B15/125 ,  G11B15/1875 ,  G11B15/4671 ,  G11B20/1207 ,  G11B20/1806 ,  G11B27/032 ,  G11B2220/90 ,  H04N5/78266 ,  H04N9/7921 ,  H04N9/8047 ,  H04N9/8205

摘要： Apparatus is adapted for recording and reproducing compressed video data in a selected one of two recording formats, of which a first format is for recording the compressed video data in N (N≧3, and representing an integer) number of tracks on a magnetic tape by dividing the video data into N number of groups, and a second format is for recording data, as auxiliary data independent from the compressed video data, in two of the tracks at both ends, and the compressed video data in (N−2) number of the tracks. In the second recording format, the recording is carried out by setting a data length of an error correction code for sync blocks longer than a data length of another error correction code for sync blocks in the first recording format.

摘要翻译： 装置适于以两种记录格式中选择的一种记录格式记录和再现压缩视频数据，其中第一格式用于将磁带上的磁迹数目N（N> = 3，并代表整数）的压缩视频数据记录 将视频数据划分为N个组，第二格式用于在两端的两个轨道中记录作为与压缩视频数据无关的辅助数据的数据，并且将（N-2）中的压缩视频数据 ）轨道数。 在第二记录格式中，通过设置比第一记录格式的同步块的另一个纠错码的数据长度长的同步块的纠错码的数据长度进行记录。

公开(公告)号：US5426550A

公开(公告)日：1995-06-20

申请号：US86450

申请日：1993-07-06

申请人： Yoshiaki Mizoh ,  Hiroshi Yohda

发明人： Yoshiaki Mizoh ,  Hiroshi Yohda

IPC分类号： G11B5/187 ,  G11B5/48 ,  G11B5/53 ,  G11B5/255

CPC分类号： G11B5/187 ,  G11B5/4893 ,  G11B5/531

摘要： A multitrack magnetic head for use with a magnetic tape in a magnetic recording and reproducing system includes at least two magnetic head tips disposed adjacent to each other and movable with respect to the magnetic tape. The head tips include a leading head tip for initial sliding contact with the magnetic tape and a trailing head tip for subsequent sliding contact with the magnetic tape. The leading head tip is made of a material whose wear resistance is greater than that of a material of which said trailing head tip is made. The head tips are held in good sliding contact with the magnetic tape for better recording and reproducing characteristics.

摘要翻译： 在磁记录和再现系统中与磁带一起使用的多轨磁头包括彼此相邻并相对于磁带可移动的至少两个磁头尖端。 头尖包括用于与磁带初始滑动接触的前导头尖和用于随后与磁带滑动接触的拖尾头尖。 前端头部由耐磨性大于所述后端头尖的材料的耐磨性的材料制成。 头尖与磁带保持良好的滑动接触，以获得更好的记录和再现特性。