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81. 发明专利

JPS54148531A Liquid particle producer 失效
标题翻译：液体颗粒生产商
公开(公告)号：JPS54148531A
公开(公告)日：1979-11-20
申请号：JP5614978
申请日：1978-05-13
申请人： Hitachi Ltd
发明人： MATSUDA YASUMASA , SHIMADA SATOSHI , KAWAKAMI HIROJI , NISHIHARA MOTOHISA , TAKATSUMA TAISAKU , SAKAE MASAJI , DOI TETSUO , YAMADA TAKEHIRO
IPC分类号： B41J2/175 , B41J2/045 , B41J2/055 , B41J2/16
CPC分类号： B41J2/14233 , B41J2/055
摘要： PURPOSE:To increase the response frequency of the liquid particle producer and improve the efficiency of the liquid particle production of driving pulses by providing liquid diodes between a liquid well and pump chambers. CONSTITUTION:Fluid diodes 17a which have no moving parts at all are formed between an ink well 12 and pump chambers 14. These liquid diodes 17a form nearly heart type barriers 19 within the channels 18 of nearly spade type, thus reducing the back flow of liquid. The formation of these type liquid diodes 17a between the ink well 12 and pump chambers 14 lets the producer exhibit good diode effect, enables its response frequency to improve up to about 10K Hz, completely eliminates the mutual interferences between the nozzles and enables piezoelectric elements 16 to operate even if the voltage of driving pulses is lowered and enhance the efficiency of particle productions.
摘要翻译：目的：通过在液体阱和泵室之间提供液体二极管来增加液体颗粒生产者的响应频率并提高液体颗粒产生驱动脉冲的效率。构成：在油墨井12和泵室14之间形成完全没有移动部分的流体二极管17a。这些液体二极管17a在近似铲形的通道18内形成几乎心脏型的屏障19，从而减少液体的回流。在油墨井12和泵室14之间形成这些液体二极管17a使制造商表现出良好的二极管效应，使其响应频率可提高至高达10KHz，完全消除了喷嘴之间的相互干扰，并且使压电元件16 即使驱动脉冲的电压降低并且提高粒子产生的效率也能够操作。

82. 发明专利

JPH1166519A MAGNETORESISTANCE EFFECT THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPH1166519A
公开(公告)日：1999-03-09
申请号：JP22411997
申请日：1997-08-20
申请人： HITACHI LTD
发明人： KAGAWA MASAYOSHI , YOSHIDA AKIRA , KAWAKAMI HIROJI , KOBAYASHI TETSUO , SAITO HARUNOBU
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To control spike type random noise element by forming a lower magnetic shield layer with a material having a coercive force larger than magnetic field to be applied to the lower magnetic shield layer during the write operation. SOLUTION: A lower magnetic shield layer 12 is formed of a material having a coercive force Hc of the film larger than the magnetic field applied during the recording operation or of a material having a large unisotropic magnetic field Hk. It is also possible to use a material having a large coercive force Hc and a large unisotropic magnetic field Hk. In the case of an MR head where a film having the single axis magnetic unisotropy is arranged on the lower magnetic shield layer with the magnetization easy axis directed to the track width direction, when a coercive force Hc of film is set to 5(Oe) or more, magnetization change of the lower magnetic shield is kept within a minor loop even if it is operated with an excitation coil and the magnetization condition after the recording operation does not become unstable due to the magnetic hysteresis. Popcorn noise appearing in the reproduced output of MR sensor after the recording operation can be controlled.

83. 发明专利

JPH1139610A THIN FILM MAGNETIC HEAD AND MAGNETIC RECORDER USING THE SAME 失效
公开(公告)号：JPH1139610A
公开(公告)日：1999-02-12
申请号：JP18626197
申请日：1997-07-11
申请人： HITACHI LTD
发明人： OKADA YUKIMASA , KAWAKAMI HIROJI
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a thin film magnetic head having an induction type thin film magnetic head for recording in which a high magentic permeability, a high responsiveness and a low coercive force are secured while keeping a uniaxial anisotropy in the magnetic pole and the magnetic core of an induction type thin film magnetic head for recording in which the ratio of a film thickness with respect to a track width is large. SOLUTION: Easily-magnetized axes of the magnetic pole 14 and the magnetic core 15 formed by taking a hard magnetic material 13 having a uniaxial anisotropy in a thin film lamination direction (film thickness direction) as a base film are made to be in the thin film lamination direction (film thickness direction) by reflecting the anisotropy of the base film. Moreover, grooves 17 for keeping the uniaxial anisotropy are provided in the magnetic core 15 and the eddy current is suppressed from being generated by the grooves 17 and notched part 18.

84. 发明专利

JPH10154309A THIN-FILM MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH10154309A
公开(公告)日：1998-06-09
申请号：JP497598
申请日：1998-01-13
申请人： HITACHI LTD
发明人： HARA SHINICHI , KAWAKAMI HIROJI , KUWAZUKA SHUNICHIRO , IKEDA HIROSHI , SUZUKI SABURO
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To prevent the degradation in S/N by flattening the gap boundaries of an inductive element. SOLUTION: A magneto-resistive element 26 disposed with conductors 23 for leads at both ends is formed on a substrate and thereafter, a magnetic film 4 is formed. An insulating film 41 to make up the difference in level on the magnet-resistive element side generated by the conductors 23 for leads is formed on the magnetic film 40. The insulating film 41 is etched back to flatten the surface on the inductive element side of the insulating film 41. The inductive element 43 is formed on the flattened insulating film 41.

85. 发明专利

JPH0660338A MAGNETO-RESISTANCE EFFECT TYPE HEAD, INSPECTION DEVICE FOR MAGNETO-RESISTANCE EFFECT TYPE HEAD AND MAGNETIC STORAGE DEVICE MOUNTING MAGNETO-RESISTANCE EFFECT TYPE HEAD 失效
公开(公告)号：JPH0660338A
公开(公告)日：1994-03-04
申请号：JP21689092
申请日：1992-08-14
申请人： HITACHI LTD
发明人： KOYANAGI HIROAKI , KAWAKAMI HIROJI , NARUSHIGE SHINJI , SHIIKI KAZUO
IPC分类号： G11B5/39 , G11B5/455
摘要： PURPOSE:To prevent the generation of damages to the magneto-resistance effect type head by providing a protection circuit for short-circuiting between a pair of electrodes when current more than a specified value is impressed to the pair of electrodes. CONSTITUTION:Electrodes 110 are mutually linked at the rear parts of the electrodes 110 via a Schottky diode 100 and a metal line 120. This diode 100 is a protection circuit in which no electricity is conducted when a specified driving power of a magneto-resistance effect type head 40 is applied. For example, current value of about 24mA and voltage of about 200mV are applied and when a voltage more than 300mV is instantaneously impressed, electricity is connected and the interval between the electrodes 110 is short-circuited. No electricity is conducted in the head 40 constituted like this by a normal driving power and when excess current generated by charge and static electricity through human intervention during an inspection process, etc., is given, electricity is conducted in the diode 100, the rear end part of the electrode is short-circuited and thus, the impression of the excess current to a magneto- resistance effect element 85 is prevented. Thus, damages to the element 85 is prevented by the short-circuiting between the electrode 110.

86. 发明专利

JPH0554582A FLOATING HEAD SLIDER AND ROTARY DISK STORAGE DEVICE 失效
公开(公告)号：JPH0554582A
公开(公告)日：1993-03-05
申请号：JP21200891
申请日：1991-08-23
申请人： HITACHI LTD
发明人： TAKEUCHI YOSHINORI , YAMAGUCHI YUZO , KAWAKAMI HIROJI
IPC分类号： G11B21/21
摘要： PURPOSE:To provide the floating head slider which prevents the attraction of a slider at the time of static contact of the device of a CS/S system, has a good low-speed floating characteristic, excellent sliding resistance, high pitching rigidity of an air film, and excellent medium follow-up characteristic, and is suitable for a low floating quantity and the rotary disk storage device. CONSTITUTION:Second gas bearing surfaces 14 having the length of >=4.5% the length of a slider extending to a storage medium side or the area of >=4.5% of the area of all gas bearing surfaces 11 are provided on the inflow side of a pair of the gas bearing surfaces 11 disposed on both side ends to bear buoyancy among plural pieces of the gas bearing surfaces making gas bearing action on the opposite surfaces of the rotating storage medium of the slider 10. The 2nd gas bearing surfaces 14 are formed of thin-film layers and further, the selection of the material of the thin-film layers is made selectable, by which the characteristics, such as sliding resistance with the storage medium, are improved.

87. 发明专利

JPH03268204A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH03268204A
公开(公告)日：1991-11-28
申请号：JP6436790
申请日：1990-03-16
申请人： HITACHI LTD
发明人： SAITO MAKOTO , KAWAKAMI HIROJI
IPC分类号： G11B5/035
摘要： PURPOSE:To easily control a delay time of an equalizing constant to a desired value by using a charge transmission device capable of a changing control on the delay time continuously from the outside as a delay element of a waveform equalizer for correcting a waveform distortion of a regenerative signal. CONSTITUTION:This device is constituted in such a manner that a data area from the inner circumference to the outer circumference in the case of an innermost circumferential track and an outermost circumferential track is logically divided, for instance, into ten, and in which area a magnetic head is positioned is transmitted from a track position signal generating circuit 19 to a equalizer control circuit 17. A control signal is outputted by this control circuit 17 to the waveform equalizer 14 and a clock generating circuit 16 in reference to the equalizing constants tau and C which are most suitable for each data area held in an equalizer constant memory 18. A transfer clock with a frequency corresponding to the control signal from the control circuit 17 is outputted by this circuit 16 to the delay element 22. Consequently, by changing the clock frequency of the delay element 22, the delay time tau is controlled, and the optimum equalizing characteristics is always maintained.

88. 发明专利

JPH0326450B2 失效
公开(公告)号：JPH0326450B2
公开(公告)日：1991-04-10
申请号：JP14106082
申请日：1982-08-16
申请人： HITACHI LTD
发明人： KAWAKAMI HIROJI , KICHISE MITSUO
IPC分类号： G11B5/596 , G11B5/58 , G11B21/10

89. 发明专利

JPH02247809A MAGNETIC DISK DEVICE AND THIN-FILM MAGNETIC HEAD MOUNTED THEREON 失效
公开(公告)号：JPH02247809A
公开(公告)日：1990-10-03
申请号：JP6623089
申请日：1989-03-20
申请人： HITACHI LTD
发明人： KAWABE TAKASHI , FUYAMA MORIAKI , NARUSHIGE SHINJI , ASHIDA EIJI , MORIJIRI MAKOTO , TANABE MASANORI , FUKUI HIROSHI , SUGITA KEN , IKEDA HIROSHI , HAYASHI MASAAKI , NAKAKOSHI KAZUO , KAWAKAMI HIROJI , SAITO SUKEO , KUWAZUKA SHUNICHIRO
IPC分类号： G11B5/012 , G11B5/31 , G11B5/39
摘要： PURPOSE:To obtain the magnetic disk device mounted with the thin-film magnetic head formed with high accuracy in hole length and track width by forming a protective film having a contact hole in the front end part of an upper magnetic film. CONSTITUTION:An upper magnetic core is bisected and the front end part 12 and a rear part 15 are connected through the contact hole 16 provided in the protective film 13 to form a magnetic circuit together with a lower magnetic film 22. The front end A of the rear part 15 of the upper magnetic film is positioned behind the point B of a gap depth 0. The purpose of such formation is to prevent the leak magnetic flux generated from the rear part 15 from affecting a recording medium. Further, the rear end D of the front end part 12 is projected from the rear end C of the contact hole 16 toward the rear of the head. The purpose of such projection is to surely connect the front end part 12 and the rear part 15 through the contact hole 16. The purpose is achieved by using such head.

90. 发明专利

JPH02244413A THIN-FILM MAGNETIC HEAD AND PRODUCTION THEREOF 失效
公开(公告)号：JPH02244413A
公开(公告)日：1990-09-28
申请号：JP6366389
申请日：1989-03-17
申请人： HITACHI LTD
发明人： SHIMIZU KOICHI , KAWAKAMI HIROJI
IPC分类号： G11B5/31
摘要： PURPOSE:To prevent corrosion of a coil of the thin-film head and to improve the accuracy of a track width by forming the coil of a corrosion resistant conductor and forming the insulating film of the rear surface of a coil of an inorg. material. CONSTITUTION:The thin-film conductor coil 2 is formed of the corrosion resistant conductor. Magnetic fluxes are generated from the track width 3 in the front end part of magnetic cores 1, 1' having a magnetic gap 11 and a gap depth 12 and signals are recorded on a recording medium when signal currents are passed to the coil 2 wound on the magnetic cores 1, 1'. On the other hand, the signals recorded in the above-mentioned stage are reproduced as signals by the coil 2 which detects the change in the magnetic fluxes from the recording medium via the track width 3 in the front end part of the magnetic cores 1, 1'. The coil of the thin-film magnetic head is formed of the corrosion resistant conductor in this case, by which the corrosion of the coil is obviated even if moisture permeation arises. The regulation of the track width to the extremely small width with high accuracy is possible in this way.

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