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1. 发明专利

JP2009301665A Playback or recording head and storage device 审中-公开
标题翻译：回放或记录头和存储设备
公开(公告)号：JP2009301665A
公开(公告)日：2009-12-24
申请号：JP2008156567
申请日：2008-06-16
申请人： Fujitsu Ltd , 富士通株式会社
发明人： MAETA HIROSHI , KANDA HIDEKAZU
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a playback or recording head, capable of detecting temperature near an element part and maintaining the characteristics of the playback or recording head suitable, by preventing the element part from being over-heated, or the like, and to provide a storage device.
SOLUTION: In the playback or recording head provided with a heater 10 for changing a projection amount of the element part by thermal expansion caused by generated heat, the heater 10 is provided with a heat generating part 12, and terminals 14 connected to both the ends of the heat generating part 12, and in the heat generating part 12, a first conductor 12a and a second conductor 12b, which are made of conductive materials having different resistivity, are formed by being connected in series between the terminals.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：为了提供一种回放或记录头，能够通过防止元件部件过热等来检测元件部分附近的温度并保持适合的重放或记录头的特性，，并提供存储装置。解决方案：在具有用于通过由发热引起的热膨胀来改变元件部分的投影量的加热器10的回放或记录头中，加热器10设置有发热部分12，并且连接到通过在端子之间串联连接而形成由发热体部分12的两端和发热体部分12构成的具有不同电阻率的导电材料制成的第一导体12a和第二导体12b。版权所有（C）2010，JPO＆INPIT

2. 发明专利

JP2006260652A Magnetic disk device 审中-公开
标题翻译：磁盘设备
公开(公告)号：JP2006260652A
公开(公告)日：2006-09-28
申请号：JP2005075223
申请日：2005-03-16
申请人： Fujitsu Ltd , 富士通株式会社
发明人： KITAJIMA MASAMITSU , KANDA HIDEKAZU , NAGAI HIROSHI , KASUGA HIROSHI
IPC分类号： G11B5/455 , G11B5/02 , G11B21/12 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To provide a magnetic disk device capable of detecting the deterioration of a magnetic head more early while the magnetic head can access the recording surface of the magnetic disk normally, thereby taking a necessary action normally.
SOLUTION: This device is provided with: a magnetic disk 2 having a recording surface b constituted of a magnetic medium and disposed to be rotary-controlled; a magnetic head 4 for accessing information in the recording surface b, an actuator 6 for supporting the magnetic head 4 and moving the magnetic head 4 in the diameter direction a of the magnetic disk 2; and a control unit 8 for controlling the rotation of the magnetic disk 2, the movement of the magnetic head 4 via the actuator 6, and accessing to the recording surface b via the magnetic head 4. The device is further provided with: a noise detection means 18 for detecting noise output from the magnetic head 4; and a head deterioration time processing means 8b for executing predetermined processing when the noise of a predetermined permissive level or higher is detected.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供能够更早地检测磁头的劣化的磁盘装置，同时磁头可以正常地访问磁盘的记录表面，从而正常地进行必要的动作。解决方案：该装置具有：磁盘2，具有由磁性介质构成的记录面b，被配置为旋转控制; 用于访问记录表面b中的信息的磁头4，用于支撑磁头4并沿磁盘2的直径方向a移动磁头4的致动器6; 以及用于控制磁盘2的旋转的控制单元8，经由致动器6的磁头4的移动，以及经由磁头4访问记录表面b。该设备还设有：噪声检测用于检测来自磁头4的噪声输出的装置18; 以及头部退化时间处理装置8b，用于当检测到预定的许可级别或更高的噪声时，执行预定的处理。版权所有（C）2006，JPO＆NCIPI

3. 发明专利

JPH0845033A MAGNETIC HEAD, MAGNETIC RECORDER AND PRODUCTION OF MAGNETIC HEAD 失效
公开(公告)号：JPH0845033A
公开(公告)日：1996-02-16
申请号：JP17880694
申请日：1994-07-29
申请人： FUJITSU LTD
发明人： KANDA HIDEKAZU
IPC分类号： G11B5/39 , G11B5/02 , G11B5/40
摘要： PURPOSE:To prevent destruction by an overvoltage, overcurrent and discharge of static electricity by inserting diodes between a magneto-resistive element and shields for shielding the element. CONSTITUTION:First and second leading-out conductors 22a, b consisting of copper films having a thickness of about 100Angstrom are mounted at both ends of the band-shaped MR element 21 having a thickness of about 340A and a sense current is supplied thereto; Both sides thereof are held by the first and second magnetic shields 23a, b consisting of soft magnetic materials, such as 'Permalloy (R)' having a thickness of 2 to 3mum, by which the MR head is composed. The respective first and second leading-out conductors 22a, b and the respective first and second magnetic shields 23a, b are connected via the diodes 24a to (d). The resistance of the MR element 21 is 5 to 10OMEGA, the sense current is 16 to 20mA and the voltage across the element is 0.2V at the max. at the time of ordinary operation of the element. The voltage at which the diodes 24a to (d) conduct is about 0.6V and does not, therefore, hinder the ordinary operation but the diodes conduct at the voltage higher than the voltage to prevent the destruction of the MR element 21.

4. 发明专利

JPH06139524A MAGNETO-RESISTANCE EFFECT TYPE HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH06139524A
公开(公告)日：1994-05-20
申请号：JP28984492
申请日：1992-10-28
申请人： FUJITSU LTD
发明人： KANAMINE MASAAKI , KANE JIYUNICHI , AOYAMA SUSUMU , KANDA HIDEKAZU , IKEGAWA YUKINORI , UEHARA YUJI
IPC分类号： G11B5/31 , G11B5/39
摘要： PURPOSE:To enable stable reading of signals by sufficiently narrowing the areas of the parts of magnetic shielding layers exposed on the floating surfaces of the magneto-resistance effect type head facing a magnetic recording medium than the cross sectional areas of the parts of the magnetic shielding layers parted from the floating surfaces. CONSTITUTION:This magneto-resistance effect type head 1 is constituted by sufficiently narrowing the areas of the parts of the magnetic shielding layers 1d, 1d' exposed on the floating surfaces of the magneto-resistance effect type head facing the magnetic recording medium 2 than the cross sectional areas of the parts of the magnetic shielding layers 1d, 1d' parted from the floating surfaces. The extension of the materials, such as magnetic shielding layers 1d, 1d' exposed on the floating surfaces of the head and lead conductors 1b, in the moving direction of the magnetic recording medium 2 is thereby substantially prevented even if the floating surface of the head 1 comes into contact with the magnetic recording medium 2. The contact of the magnetic shielding layers 1d, 1d' and the lead conductors 1b is thus eliminated and the flow of the sense current through the magnetic shielding layers 1d, 1d' is prevented. The stable reading output of the signals is thus obtd.

5. 发明专利

JPH06103508A MAGNETC DISK DEVICE 失效
公开(公告)号：JPH06103508A
公开(公告)日：1994-04-15
申请号：JP25095192
申请日：1992-09-21
申请人： FUJITSU LTD
发明人： KANDA HIDEKAZU
IPC分类号： G11B5/02 , G11B5/09 , G11B5/39 , G11B19/02
摘要： PURPOSE:To prevent a magneto-resistance effect element from burning and to prevent the formation of a magnetic domain structure easy to generat a noise by connecting a diode, a constant voltage diode or a fixed resistor with a small resistance in parallel to a maneto-resistance effect type head. CONSTITUTION:The diode 13 is connected in parallel to the magneto-resistance effect type head 1. At this time, when the resistance value of the head 1 at a regular time is regarded as 30OMEGA, the sense current at a regular time as 20mA, since the voltage between both ends of the head l becomes 6O0mV, a diode whose forward voltage drop is e.g. 650mV extent is selected as the diode 13. Then, both ends voltage of the diode 13 becomes 600mV regularly, the all sense current flows through the head 1. At this time, when excessive current is going to flow and, both ends voltage of the diode 13 exceeds 650mV, the excessive current due to it flows through the diode 13, and the head 1 is prevented from being furned.

6. 发明专利

JPH0660335A MAGNETO-RESISTANCE EFFECT TYPE THIN-FILM MAGNETIC HEAD 失效
公开(公告)号：JPH0660335A
公开(公告)日：1994-03-04
申请号：JP21497892
申请日：1992-08-12
申请人： FUJITSU LTD
发明人： KANDA HIDEKAZU
IPC分类号： G11B5/39
摘要： PURPOSE:To effectively execute the heat radiation of a magneto-resistance effect element. CONSTITUTION:A part 1b of the magneto-resistance effect element 1 is insulated and disposed between leading out conductors 2a, 2b on the surface opposite from a head floating surface 1c. A material 3 having a high thermal conductivity is joined to a part 1b thereof and the joint part 4a of different metallic films or semiconductor films 4, 4' having a high Peltier effect is successively joined to a part 1b thereof. The supply of current to the different metallic films or semiconductor films 4, 4' is shared by use for the leading out conductors 2a, 2b for supplying the sense current to the magneto-resistance effect element 1.

7. 发明专利

JPH05114120A MAGNETORESISTANCE EFFECT TYPE MAGNETIC HEAD AND PRODUCTION THEREOF 失效
公开(公告)号：JPH05114120A
公开(公告)日：1993-05-07
申请号：JP27381591
申请日：1991-10-22
申请人： FUJITSU LTD
发明人： KANAMINE MASAAKI , KUTSUZAWA TOMOKO , UEHARA YUJI , KANAI HITOSHI , KANDA HIDEKAZU
IPC分类号： G11B5/39
摘要： PURPOSE:To prevent the generation of crosstalks noises by setting the spacing between the magnetic shielding layers in the central part of an electric circuit of one turn formed of leader conductor layers and a magnetoresistance type element larger than the spacing between the magnetic shielding layers exclusive of these layers. CONSTITUTION:The spacing between the magnetic shielding layers 3 and 4 in the central part of the electric circuit of the one turn formed of the leader conductor layers 1, 1 and the magnetoresistance type element 2 is set larger than the spacing by the nonmagnetic insulating layer 5 between the magnetic shielding layers exclusive of these layers by providing a spacer 6 consisting of a nonmagnetic material between the magnetic shielding layers 3 and 4. The magnetic resistance in the central part of the electric circuit of the one turn is thereby increased, by which the magnetic fields leaking form the plural tracks of a magnetic memory medium are hardly admitted into the electric circuit of the one turn formed of the leader conductor layers 1, 1 and the magnetoresistance type element 2 via the magnetic shielding layers 3, 4. The flow of the current to the magnetoresistance type element 2 by the electromagnetic induction effect by the leaking magnetic fields and the generation of the crosstalk noises are obviated.

8. 发明专利

JPH04286765A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH04286765A
公开(公告)日：1992-10-12
申请号：JP5288591
申请日：1991-03-18
申请人： FUJITSU LTD
发明人： KANDA HIDEKAZU
IPC分类号： G11B15/467 , G11B19/20
摘要： PURPOSE:To correct the tracking deviation of a magnetic disk which rotates in a floating state by providing a correcting means for correcting the tracking deviation from a magnetic head pressing the end face of the magnetic disk. CONSTITUTION:A magnetic disk 1 is rotated in a casing 2 in a floating state and information is recorded and reproduced on the magnetic disk 1 by a magnetic head 3 fixed to the casing 2. A rotary shaft is shifted by pressing the end face of the magnetic disk 1 in accordance with the tracking deviation of the magnetic disk 1. Thus, the tracking deviation from the magnetic head 3 is corrected by the correcting means of piezoelectric elements 4a and 4b arranged on the position in the vicinity of, away from and opposed to the end face of the magnetic disk 1 of the casing 2 and opposed to each other as well.

9. 发明专利

JPH0344809A THIN-FILM MAGNETIC HEAD FOR PERPENDICULAR RECORDING 失效
公开(公告)号：JPH0344809A
公开(公告)日：1991-02-26
申请号：JP17893189
申请日：1989-07-13
申请人： FUJITSU LTD
发明人： TAKAGI HITOSHI , SUZUKI FUMITAKE , KOSHIKAWA YOSHIO , KUME TOMIO , KANDA HIDEKAZU
IPC分类号： G11B5/31 , G11B5/127
摘要： PURPOSE:To improve the reliability of perpendicular magnetic recording by providing a sensor member for detecting external magnetic fields perpendicular to the magnetic medium and connecting the member to an external circuit in such a manner as to allow the generation of a magnetic field for correction in the direction where the detected external magnetic field is negated. CONSTITUTION:A terminal 43c of an analog switch 43 is connected to a terminal 43a by the instruction of a control circuit 46 in an external magnetic field detecting mode and, therefore, one end of the sensor 30 is connected to a constant current source 41 and a sample-hold circuit 44 and a current flows to the MR element 31 of the sensor 30. The MR element 31 is changed in electric resistance by the external magnetic field and the DC potential for monitoring corresponding to the intensity of the external magnetic field in the direction horizontal with the medium film surface is obtd. by impressing a bias magnetic field thereto in order to make linear operation. Since the external floating magnetic field near a main magnetic pole 4 can be corrected, the concentration of the magnetic flux to the main magnetic pole by the floating magnetic field is lessened. As a result, the demagnetization and degaussing of the information recorded on the magnetic recording medium are prevented. The thin-film magnetic head for perpendicular recording having the high reliability is obtd. in this way.

10. 发明专利

JPH02103726A PRODUCTION OF PERPENDICULAR MAGNETIC DISK 失效
公开(公告)号：JPH02103726A
公开(公告)日：1990-04-16
申请号：JP25612688
申请日：1988-10-11
申请人： FUJITSU LTD
发明人： KANDA HIDEKAZU , HATA KUNIO
IPC分类号： G11B5/84 , G11B5/858
摘要： PURPOSE:To improve durability of a perpendicular recording layer by disposing a lot of column-type protrusions to erect at specific intervals on a disk substrate by using harder material for the protrusions than the soft magnetic layer with high magnetic permeability afterward to be provided, forming the soft ferromagnetic layer with high magnetic permeability in a manner that the top ends of the protrusions remain as protrusions, and then forming the perpendicular recording layer and a protective film thereon. CONSTITUTION:A base film 12 is formed on the disk substrate 11 by plating, on which a lot of columnar protrusions 15 which are insulating and harder than the soft magnetic layer 16 are disposed at specific intervals. The soft magnetic layer 16 with high magnetic permeability is then formed by electroplasting on the base layer 12 in a manner that the top ends of the protrusions still remain as protrusions. Then, the perpendicular recording layer 17 is formed on the soft magnetic layer 16 including the protrusions 15. By this method, the soft magnetic layer which has high magnetic permeability but rather low mechanical strength is reinforced, so that the perpendicular recording layer 17 formed on the soft magnetic layer shows significantly improved impact strength against a magnetic head. Thus, a perpendicular magnetic disk with high durability can be easily obtained.

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