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1. 发明专利

JPS61145712A MAGNETIC HEAD 失效
公开(公告)号：JPS61145712A
公开(公告)日：1986-07-03
申请号：JP26636784
申请日：1984-12-19
申请人： HITACHI MAXELL , HITACHI LTD
发明人： FUJIWARA HIDEO , TOTTORI TAKESHI , HAYASHI MASASHI , INAGOYA OSAMU , YAMANO MINORU , KUMASAKA TAKAYUKI , OTOMO MOICHI , KUDO SANEHIRO , MORIKAWA JUICHI
IPC分类号： G11B5/127 , G11B5/187 , G11B5/23 , G11B5/265 , G11B5/31
摘要： PURPOSE:To decrease the time needed for formation of a magnetic thin film by forming a projection part with plural projections at a part where the core base of a core half is set opposite to a magnetic gap. CONSTITUTION:The projection parts 29 and 32 containing four projections are formed at the parts where the 1st and 2nd core bases 30 and 33 of a record/ reproduction head 21 are set opposite to a magnetic gap 35. Therefore magnetic thin films 31 and 34 are formed into plural chevrons at their tip parts according to the forms of parts 29 and 32. Thus the areas near the bottom parts of those chevrons formed at the tips of both films 31 and 34 can be cut when the gap 35 is formed by cutting away both films 31 and 34. In such a way, the desired track width l of 100-140mum can be obtained easily by setting properly the sizes and numbers of projections of both parts 29 and 32 respectively.

2. 发明专利

JPS6174118A Magnetic head 失效
标题翻译：磁头
公开(公告)号：JPS6174118A
公开(公告)日：1986-04-16
申请号：JP19487584
申请日：1984-09-19
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： INAGOYA OSAMU , FUJIWARA HIDEO , TOTTORI TAKESHI , YAMANO MINORU , KUMASAKA TAKAYUKI , OTOMO MOICHI , KUDO SANEHIRO , MORIKAWA JUICHI
IPC分类号： G11B5/245 , G11B5/127 , G11B5/187 , G11B5/23 , G11B5/265 , G11B5/31
CPC分类号： G11B5/3103 , G11B5/1878
摘要： PURPOSE:To realize a head with excellent high frequency characteristic by selecting an cross angle of both side faces of a projected part of a core base as >=90 deg. so as to make the magnetic thin film thin. CONSTITUTION:A composite magnetic head consists of a recording/reproducing head 21, an erasure head 22 and an intermediate nonmagnetic substance 23. The 1st core half 24 consists of the 1st core base 30 having a projection 29 at the center of opposed side face to the magnetic gap 35 and the 1st magnetic thin film 31. Then a top angle theta2 of the projection 29 is specified in the range between 90 and 150 deg.. The similar structure is applied also to the erasure head 22. Thus, the characteristic of the magnetic thin film is attained sufficiently and chipping is prevented to make the film thickness thin. Thus, the magnetic loss based on eddy currents is suppressed to obtain a head with excellent high frequency characteristic.
摘要翻译：目的：通过选择核心基底的突出部分的两个侧面的横角为> = 90度，实现具有优异的高频特性的头部。从而使磁性薄膜变薄。构成：复合磁头由记录/再现头21，擦除头22和中间非磁性物质23组成。第一芯半部24由第一芯基座30组成，第一芯基座30具有在相对侧面至磁隙35和第一磁性薄膜31.然后，凸起29的顶角θ2在90和150度之间的范围内。类似的结构也应用于擦除头22.因此，充分地获得磁性薄膜，防止了切片，使薄膜变薄。因此，抑制基于涡电流的磁损耗，以获得具有优异的高频特性的磁头。

3. 发明专利

JPS6199913A Magnetic head 失效
标题翻译：磁头
公开(公告)号：JPS6199913A
公开(公告)日：1986-05-19
申请号：JP19487484
申请日：1984-09-19
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： INAGOYA OSAMU , FUJIWARA HIDEO , YAMANO MINORU , TOTTORI TAKESHI , KUMASAKA TAKAYUKI , OTOMO MOICHI , KUDO SANEHIRO , MORIKAWA JUICHI
IPC分类号： G11B5/127 , G11B5/187 , G11B5/23 , G11B5/245 , G11B5/265 , G11B5/31
CPC分类号： G11B5/3103 , G11B5/127 , G11B5/1878
摘要： PURPOSE:To improve the magnetic characteristic by constituting a core base part and a magnetic thin film stuck to its surface so that the minimum value of the sum total of the product of a sectional area except a magnetic gap part of a magnetic path and a saturation magnetic flux density exceeds the product of the magnetic thin film and the saturation magnetic flux density. CONSTITUTION:In a magnetic path except a magnetic gap opposed surface in the first core half body 24, the sum total of the product of a sectional area roughly vertical to the direction of a magnetic flux flowing to the first core base body 30 and a saturation magnetic flux density of the first core base body, and the product of a sectional area roughly vertical to the direction of a magnetic flux flowing to the first magnetic thin film 31 and a saturation magnetic flux density of its first magnetic thin film 31 becomes the smallest at positions of thick lines A, B, C, D and E. In case when sectional areas of parts which have been cut along the thick lines A, B, E, C and D are denoted as S1, S2, S3, S4 and S5, respectively, and a magnetic gap opposed area of the magnetic thin film 31, a saturation magnetic flux density of the first core base body 30, and a saturation magnetic flux density of the magnetic thin film 31 have been defined as S6, B31, and B32, respectively, the core base body 30 and the magnetic thin film 31 are constituted so that the expression is formed (S1+S2+S3)B32+ S4.B31>=S6.B32. In this way, an excellent magnetic characteristic is obtained.
摘要翻译：目的：通过构成芯基部和粘附在其表面上的磁性薄膜来提高磁特性，使得除了磁路的磁隙部分以外的截面积和饱和度的乘积的总和的最小值磁通密度超过磁性薄膜的乘积和饱和磁通密度。构成：除了第一铁心半体24中的磁隙对置面以外的磁路中，与流过第一铁心基体30的磁通的方向大致垂直的截面积的积的总和和饱和第一芯基体的磁通密度以及与流过第一磁性薄膜31的磁通方向大致垂直的截面积和其第一磁性薄膜31的饱和磁通密度的乘积成为最小在粗线A，B，C，D和E的位置处，沿着粗线A，B，E，C和D切割的部分的截面面积被表示为S1，S2，S3，S4和 S5，磁性薄膜31的磁隙对置区域，第一芯基体30的饱和磁通密度和磁性薄膜31的饱和磁通密度定义为S6，B31，和B32，分别为核心底座 y 30和磁性薄膜31构成为形成表达式（S1 + S2 + S3）B32 + S4.B31> = S6.B32。以这种方式获得优异的磁特性。

4. 发明专利

JPS61115204A Magnetic head 失效
标题翻译：磁头
公开(公告)号：JPS61115204A
公开(公告)日：1986-06-02
申请号：JP23596684
申请日：1984-11-10
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： INAGOYA OSAMU , FUJIWARA HIDEO , TOTTORI TAKESHI , HAYASHI MASASHI , OTOMO MOICHI , KUMASAKA TAKAYUKI , KUDO SANEHIRO
IPC分类号： G11B5/127 , G11B5/187 , H01F10/20
CPC分类号： G11B5/127 , G11B5/187
摘要： PURPOSE:To assure an excellent magnetic characteristic by positioning the sliding surface of a substrate which supports a thin ferromagnetic metallic film toward the (1, 1, 0) face from the single crystal manganese-zinc ferrite face and toward the (2, 1, 1) face from the (1, 1, 1) face respectively within specific angles of inclination. CONSTITUTION:A magnetic head is manufactured by using respectively single crystal manganese-zinc ferrite as the core substrate and an amorphous alloy of cobalt-niobium-zirconium as the thin ferromagnetic metallic film. The magnetic head is brought into contact with a magnetic disk while the disk is kept rotated to maintain the continuous sliding contact between the head and disk. As a result, the head is so formed that the sliding surface of the core substrate is positioned within the range of 0-30 angle of inclination from the (1, 1, 1) face toward the (1, 1, 0) face and within the range of 0-30 angle of inclination from the (1, 1, 1) face toward (2, 1, 1) face, then the core substrate and the thin ferromagnetic metallic film wear approximately at the similar rate and therefore the difference of steps between both is extremely small.
摘要翻译：目的：通过将支撑薄铁磁性金属膜的基板的滑动面从单晶锰锌铁氧体磁体朝向（1，1，0）面朝向（2,1， 1）分别在特定倾斜角内从（1,1,1）面朝向。构成：通过分别使用单晶锰锌铁氧体作为核心基板和钴 - 铌 - 锆的非晶合金作为薄铁磁金属膜来制造磁头。磁盘与磁盘接触，同时保持磁盘旋转以保持磁头和磁盘之间的连续滑动接触。结果，头部形成为使得芯基板的滑动面位于从（1,1,1）面朝向（1,1,0）面的0-30°的倾斜角度的范围内，以及在从（1,1,1）面到（2,1,1）面的0-30°的倾角范围内，芯基板和薄铁磁性金属膜的磨损程度大致相同，因此差异两者之间的步骤是非常小的。

5. 发明专利

JPH04274032A OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH04274032A
公开(公告)日：1992-09-30
申请号：JP5358091
申请日：1991-02-27
申请人： HITACHI MAXELL , HITACHI LTD
发明人： SAKAMOTO AKITO , INAGOYA OSAMU , MAEDA TAKESHI
IPC分类号： G11B7/09 , G11B11/10 , G11B11/105
摘要： PURPOSE:To prevent the tracking information signal in ROM area obtained in three-beam system from being influenced by the density of prepit for the optical information carrier in which ROM area and non-ROM are mixed. CONSTITUTION:When the two sub-light beam reproduces ROM area, the alternating components are generated by performing the amplitude modulation by the prepit. In these alternating components, the larger the density in the prepit is, the smaller the amplitude becomes. Therefore, the output signals in photodiodes 15b, 15c receiving sub-light beam are made into the waveform and equalized so that the higher frequency may be, the larger the amplitude may become in differential circuits 35, 36 and the influence by the prepit is removed. A tracking information signal (d) is formed from the alternating component of output signals in the differential circuits 35, 36 by upper side envelope detection circuits 37, 38, lower side envelope detection circuits 39, 40 and an arithmetic amplifier 41.

6. 发明专利

JPS63213108A MAGNETIC HEAD 失效
公开(公告)号：JPS63213108A
公开(公告)日：1988-09-06
申请号：JP4532487
申请日：1987-03-02
申请人： HITACHI MAXELL , HITACHI LTD
发明人： INAGOYA OSAMU , MIKAMI HIROSUKE , TOTTORI TAKESHI , ONUKI TAKESHI , FUJIWARA HIDEO , OTOMO MOICHI
IPC分类号： G11B5/127 , G11B5/187 , G11B5/23 , G11B5/31
摘要： PURPOSE:To prevent the conduction between thin magnetic metallic films and to maintain the insulating characteristic of intermediate layers to be formed between the thin magnetic metallic films so as to improve recording and reproducing characteristics by forming the above-mentioned intermediate layers in such a manner that said layers project from the end faces of the thin magnetic metallic films. CONSTITUTION:The intermediate layers 2 as insulating layers are provided to the end faces of the thin magnetic metallic films 1 in such a manner that said layers partly project from the end faces. A nonmagnetic material having the hardness larger than the hardness of the film 1 is used for the layer 2 in the case of using a method for polishing the end faces to a specular surface for the above-mentioned purpose. Then, the worn layer of the layer 2 is formed smaller than the films 1 and the layers 2 project from the end faces of the films 1. The recording and reproducing characteristics can be improved by setting the roughness of the mirror-polished surface at

7. 发明专利

JP2553494B2 失效
公开(公告)号：JP2553494B2
公开(公告)日：1996-11-13
申请号：JP9659785
申请日：1985-05-09
申请人： HITACHI MAXELL
发明人： SAKAMOTO AKITO , INAGOYA OSAMU
IPC分类号： G11B5/23 , G11B5/127 , G11B5/245

8. 发明专利

JPH06176422A MAGNETO-OPTICAL DISK DRIVING DEVICE 失效
公开(公告)号：JPH06176422A
公开(公告)日：1994-06-24
申请号：JP32202392
申请日：1992-12-01
申请人： HITACHI MAXELL
发明人： INAGOYA OSAMU
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To provide a magneto-optical disk driving device small in power consumption and stable in recording characteristics by eliminating the influence of a magnetic field leaked from an objective lens actuator. CONSTITUTION:A magnetic head 11 and an objective lens 25 of an optical head 21 are disposed opposite to each other via a magneto-optical disk 1. The objective lens is equipped with the actuator 41 for automatically focusing a light beam on a recording surface 2 of the magneto-optical disk. The magnetic head is equipped with a recording or erasing coil 13 and a canceling coil 14, and a current in proportion to a current impressed to the actuator is impressed to this canceling coil in the direction of canceling the leakage magnetic field.

9. 发明专利

JPH03296974A DATA RECORDING SYSTEM AND DATA REPRODUCING SYSTEM 失效
公开(公告)号：JPH03296974A
公开(公告)日：1991-12-27
申请号：JP9774790
申请日：1990-04-16
申请人： HITACHI MAXELL
发明人： INAGOYA OSAMU
IPC分类号： G06F3/06 , G11B20/10 , G11B20/12
摘要： PURPOSE:To minimize a decoding error due to a bit error by adding a block length data representing the length of a block to the head of each block in the case of applying variable coding to the data. CONSTITUTION:Output information of an ADCT (adaptive discrete cosine transformation) circuit 2 is fed to a Huffman coding circuit 3, in which the information is subject to Huffman coding in the unit of blocks. The information subject to Huffman coding is fed to a block length data addition circuit 4 and a block length data generating circuit 5, in which the data representing number of bits (that is, block length data) forming the block is generated for each block. Then the block length data generated in the block length data addition circuit 4 is added to a tip of a relevant block, then the block is discriminated clearly, a Huffman decoding error due to a bit error is stocked in the block, thereby reducing the decoding error.

10. 发明专利

JPH03256205A MAGNETIC HEAD 失效
公开(公告)号：JPH03256205A
公开(公告)日：1991-11-14
申请号：JP5274490
申请日：1990-03-06
申请人： HITACHI MAXELL
发明人： TOTTORI TAKESHI , MIKAMI KANSUKE , INAGOYA OSAMU , FUJIWARA HIDEO
IPC分类号： G11B5/187
摘要： PURPOSE:To greatly increase a head output and to allow high-density recording by forming the fine structure of an amorphous magnetic alloy of a plate structure or a mixed structure of the plate structure and a frosty structure. CONSTITUTION:The right half part and left half part with A-A' shown in Fig. are core half bodies. The magnetic head is formed by joining these bodies with low melting joining glass 3. The core half bodies are formed with amorphous magnetic thin films 2 and the low melting joining glass 3 on substrates 1 having a peak shape and the front ends of the amorphous magnetic thin films 2 generated by the front ends of the substrates 1 are partly chipped and are so polished as to be made flat. The flat parts of the amorphous magnetic thin films 2 constitute the opposite surfaces of a head gap 4. The two core half bodies are so joined that the opposite surfaces face each other. The thin film of SiO2 is interposed between these opposite surfaces and the thickness thereof regulates the length of the head gap. The fine structures of the amorphous magnetic thin films 2 are the plate structure on flat parts and are the frosty structure in the slopes if single crystal Mn-Zn ferrite plates are used for the substrates 1 and the amorphous magnetic alloys of Co-Nb-Zr for the amorphous magnetic thin films 2 and these films are formed by sputtering.

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