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1. 发明专利

JPH01166382A MAGNETIC HEAD SLIDER 失效
公开(公告)号：JPH01166382A
公开(公告)日：1989-06-30
申请号：JP32393187
申请日：1987-12-23
申请人： HITACHI LTD
发明人： FUJII MASATAKA , SAITO SUKEO , NAKAJIMA HIROYASU
IPC分类号： G11B21/21
摘要： PURPOSE:To obtain high recording density by fixing a piezoelectric element to the back of a slider and arbitrarily changing the flat degree of a slider surface, which faces to a magnetic disk, with an impressing voltage. CONSTITUTION:By impressing the voltage to a piezoelectric element 4, which is fixed to the back of a slider 2 of a magnetic head slider 1, before a disk 5 is rotated, the piezoelectric element 4 generates deformation in the thickness direction of the slider 2 and then, the slider 2 surface to face to the magnetic disk 5 is deformed in a circular arcuate shape. Accordingly, attraction between the magnetic disk 5 and the magnetic head slider 1 is reduced. On the other hand, by removing the impressing voltage after the disk 5 is rotated, the slider 2 surface to face to the magnetic disk 5 surface goes to be flat and a minimum floating interval can be positioned to the flowing-out edge part of the slider 2, namely, to a thin film element 3 part. Accordingly, an arbitrary setting can be executed to an optimum crown height hc to the attraction. Thus, the high recording density can be obtained.

2. 发明专利

JPS61237262A MAGNETIC HEAD DEVICE 失效
公开(公告)号：JPS61237262A
公开(公告)日：1986-10-22
申请号：JP7834185
申请日：1985-04-15
申请人： HITACHI LTD
发明人： KARAKAMA YOSHIAKI , DAITO HIROSHI , NAKAJIMA HIROYASU , SAITO SUKEO
IPC分类号： G11B17/32 , G11B21/20 , G11B21/21
摘要： PURPOSE:To decrease slipping off in position of a magnetic head with respect to an information track surface and to improve an off-track by approaching an attaching angle of a load arm of a magnetic head support body in a longitudinal direction with respect to the information track surface of a magnetic disk to 0 deg.. CONSTITUTION:To a magnetic head arm 7, a magnetic head support body 9 is attached through a spacer 8. The support body 9 is constituted by a load arm 10 and a load spring section 11. To an end of the arm 10, a magnetic head 2 is attached through a gimbal spring 3. The head 2 is followably disposed on an information track surface of a magnetic disk 1. The arm 10 of the support body 9 approaches an attaching angle theta1 with respect to the information track surface of the disk 1 to 0 deg. to be adjusted. In such a manner, slipping off in position of the magnetic head with respect to the information track surface is reduced and an off-track can be improved.

3. 发明专利

JP2533512B2 失效
公开(公告)号：JP2533512B2
公开(公告)日：1996-09-11
申请号：JP1237287
申请日：1987-01-23
申请人： HITACHI LTD
发明人： YAMAGUCHI JUZO , TAKEUCHI YOSHINORI , TOKUYAMA MIKIO , SAITO SUKEO , DAITO HIROSHI , UMAGOE YUKIMORI , NAKAJIMA HIROYASU , KARAKAMA YOSHIAKI , HORI KAZUNORI
IPC分类号： G11B21/02 , G11B5/58 , G11B21/16 , G11B21/21

4. 发明专利

JPS63257916A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63257916A
公开(公告)日：1988-10-25
申请号：JP9084787
申请日：1987-04-15
申请人： HITACHI LTD
发明人： FUJII MASATAKA , SAITO SUKEO , NAKAJIMA HIROYASU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/706 , G11B5/738
摘要： PURPOSE:To increase recording density without decreasing the thickness of a thin magnetic film, amt. of spacing and the thickness of a protective film by constituting the thin magnetic film in such a manner that the coercive force in the thickness direction thereof is smaller the nearer the substrate. CONSTITUTION:This recording medium is constituted by forming an underlying film 3 consisting of a cobalt-phosphorus alloy and chromium on an aluminum substrate 2 consisting of an aluminum base material, then forming the thin magnetic film 4 consisting of a cobalt-nickel alloy thereon and further, forming a lubricative carbon for improving the corrosion resistance of the film 4 and the sliding resistance of a head 6 on the film 4. The coercive force Hc of the thin 4 is changed according to the thickness direction of the film 4 so that the coercive force in the thickness direction is smaller the nearer the substrate. The coercive force of the thin magnetic film is, therefore, relatively increased without decreasing the thickness of the thin magnetic film, the amt. of spacing and the thickness of the protective film.

5. 发明专利

JPS62285285A MAGNETIC HEAD SUPPORTING MECHANISM 失效
公开(公告)号：JPS62285285A
公开(公告)日：1987-12-11
申请号：JP12793686
申请日：1986-06-04
申请人： HITACHI LTD
发明人： TOKUYAMA MIKIO , YAMAGUCHI YUZO , HIBINO YOZO , SONODA TARO , TAKEUCHI YOSHINORI , TAKAHASHI KUNIHIRO , NAKAJIMA HIROYASU , DAITO HIROSHI
IPC分类号： G11B21/21
摘要： PURPOSE:To stabilize bloating of a magnetic head and a recording/reproducing signal by adopting a streamline structure for the structure of cross section of a side ridge bent part of a beam part for load. CONSTITUTION:The beam for load 12 is formed as a long triangle, two side ridges are bent upward and the bent part 13 is formed to be streamline. Even if an air flow is given to the beam part 12 from the direction of arrow A while a magnetic recording medium is rotated, the air flow S flows toward the rear side without being separated from the beam 12 and a vortex (d) caused in this case is less. As a result, the static pressure at the upper/lower face of the beam part 12 is not much fluctuated and buoyancy F is stabilized.

6. 发明专利

JPS60179923A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS60179923A
公开(公告)日：1985-09-13
申请号：JP3423984
申请日：1984-02-27
申请人： HITACHI LTD
发明人： NAGAIKE SADAKUNI , NAKAJIMA HIROYASU , OOURA MASAKI
IPC分类号： G11B5/10 , G11B5/31 , G11B5/60 , H01F10/28
摘要： PURPOSE:To obtain a magnetic disk which excels in especially the rubbing performance and the machining performance with a long lifetime, by using Al2O3, TiC and Si or an Si oxide to a slider material for thin film magnetic head. CONSTITUTION:Al2O3, TiC and the Si or SiO2 powder are kneaded completely by a ball mill and molded with a hot press. Otherwise both Al2O3 and TiC are burnt at a low level of density, and Si (99.9% purity) is impregnated under vacuum into the calcined product. Then a material turned into high density through hot press is used to obtain a slider part 1 of a thin film head. The Al2O3/TiC in said material is set at 8/2-2/8 together with the Si set at 15wt%. Thus it is possible to obtain a slider of a long lifetime which is excels in the machining performance as well as in the rubbing performance to a magnetic disk.

7. 发明专利

JPS59223917A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS59223917A
公开(公告)日：1984-12-15
申请号：JP9779783
申请日：1983-06-03
申请人： HITACHI LTD
发明人： NAKAJIMA HIROYASU
IPC分类号： G11B5/31 , G11B5/40 , G11B23/50 , G11B5/12
摘要： PURPOSE:To improve the slidability of a device to a recording medium by forming the face, which faces the recording medium, of the device with materials which has enough heat conductivity to carbonate a binder of the recording medium when this face is slided on the recording medium. CONSTITUTION:If ceramics having a low heat conductivity such as ZrO2 are used as a base material, the temperature rises considerably because of less radiation, and the binder is carbonated, and the carbide improves the slidability, and therefore, a long life is expected. When the face, which faces the recording medium, of a magnetic head is formed with various kinds of material and is allowed to collide artificially with a magnetic disc to measure sliding characteristics of individual materials, the magnetic head is floated on the rotating magnetic disc and a specific oscillation is given to the magnetic head for the purpose of accelerating the collision phenomenon between the magnetic head and the magnetic disc. As the result of measurement where materials indicated in a table 1 are used as slider materials of the nagnetic head, the life of sliding of various kinds of materials is longer according as the heat conductivity is lower, and materials having >=0.03cal/cm.sec. deg.C heat conductivity are superior in sliding characteristic.

8. 发明专利

JPH076536A TRANSDUCER SUPPORTING DEVICE 失效
公开(公告)号：JPH076536A
公开(公告)日：1995-01-10
申请号：JP33105193
申请日：1993-12-27
申请人： HITACHI LTD
发明人： YAMAGUCHI YUZO , TAKEUCHI YOSHINORI , TOKUYAMA MIKIO , SAITO SUKEO , DAITO HIROSHI , UMAGOE YUKIMORI , NAKAJIMA HIROYASU , KARAKAMA YOSHIAKI , HORI KAZUNORI
IPC分类号： G11B21/21
摘要： PURPOSE:To prevent a magnetic transducer and a recording surface of a magnetic disk from coming into contact with each other by providing a free end of a rigid structural supporing body on an access mechanism apart from the magnetic disk from a fixing position on the side of the access mechanism. CONSTITUTION:Since the rigid structural supporting body 5 is provided with the free end on the side of a soft structural supporting body 10 apart from the recording surface of the magnetic disk 1 from the position of its fixing side, when the supporting body 5 is moved in the central direction of the disk 1 by a guide arm 4 connected to the access mechanism, an airflow is bumped against the opposite surface of a load beam 8 to the recording surface of the disk 1 to generate inertia on the supporting body 5. By this method, the free end side of the supporting body 5 is displaced in the separating direction from the disk 1 at a fulcrum of a fixed point of the side of the guide arm 4. Then, a slider 3, the magnetic transducer 2 are separated from the disk 1, so that the transducer 2 is prevented from coming into contact with the recording surface of the disk 1. By this method, the reliability of recording and writing information on the disk 1 is improved.

9. 发明专利

JPH01319187A MAGNETIC HEAD 失效
公开(公告)号：JPH01319187A
公开(公告)日：1989-12-25
申请号：JP15026788
申请日：1988-06-20
申请人： HITACHI LTD
发明人： NAKAJIMA HIROYASU , FUJII MASATAKA , SAITO SUKEO
IPC分类号： G11B21/21
摘要： PURPOSE:To cause a magnetic disk to be hard to damage even with the repetition of a contact start stop CSS and to lengthen a CSS resisting lifetime by preventing a contact pressure between a magnetic head and the magnetic disk from being increased too much and releasing an attracted condition between the magnetic head and magnetic disk. CONSTITUTION:The magnetic head is composed of a slider part 3 having a floating surface 2 opposed to a magnetic disk 1 and a supporting spring part 4 to support the slider part 3 and to give a press force to the magnetic disk 1. To the supporting spring part 4, a strain gage 5 to detect the attracted condi tion between the floating surface 2 and magnetic disk 1 is fitted, and further, a piezoelectric element 6 to deform the slider 3 and to change the floating surface in an arc shape is fitted on a surface at a side opposite to the floating surface 2 of the slider 3. In such a way, the attracted condition between the magnetic head and magnetic disk can be released without increasing the contact pressure between the magnetic head and magnetic disk too much at the time of the contact start. Thus, the magnetic disk is hard to damaged even due to the repetition of the CSS, and the CSS resisting lifetime can be lengthened.

10. 发明专利

JPS6348673A MAGNETIC HEAD SUPPORT MECHANISM 失效
公开(公告)号：JPS6348673A
公开(公告)日：1988-03-01
申请号：JP19206986
申请日：1986-08-19
申请人： HITACHI LTD
发明人： NAKAJIMA HIROYASU , DAITO HIROSHI , SAITO SUKEO
IPC分类号： G11B21/21
摘要： PURPOSE:To improve the reliability of a recording/reproducing signal by forming a projection to an elastic part of a member used in common and mounting a damper member to a part to be fixed in contact with the said projection so as to make the floating of a core slider stable even if an external disturbance is caused in a magnetic disk device. CONSTITUTION:The projection 27 improving the rigidity of the elastic part 25 is provided to the elastic part of the member 22 used in common. Further, the damping member 28 in contact with the projection 27 at a proper weight is provided to a fixed part 26. In case of the core slider 11 floated, if an external disturbance due to the air flow attended with the rotation of the magnetic disk and the vibration of the guide arm of the carriage is caused in the device using the magnetic head, the elastic part 25 of the member 22 is vibrated vertically or in the torsional direction and it might cause the floating of the core slider 11 unstable. Since the projection 27, however, is provided to the elastic part 25 and the rigidity of the elastic part 25 is enhanced, the vibration caused to the elastic part 25 is reduced surely.

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