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1. 发明专利

JPH0325721A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0325721A
公开(公告)日：1991-02-04
申请号：JP15953289
申请日：1989-06-23
申请人： HITACHI LTD
发明人： KAZAMA TOSHINORI , MIYAKE YOSHIHIKO
IPC分类号： G11B5/708 , C09D5/23
摘要： PURPOSE:To form the magnetic powder which is uniform in distribution, with less surface defects, good in electromagnetic conversion characteristics and can assure the strength of a coated film, by forming the shape of fillers incorporated in a magnetic layer to the shape nearly similar to or analogous with the shape of the magnetic powder. CONSTITUTION:The magnetic powder 3 and the fillers 4, 5 flocculate and suspend as several micron particles in a resin soln. 6 when a magnetic coating compd. 1 is spin-coated on a substrate. The magnetic powder 3 is attracted and moved at places near a magnetic pole 7 when the magnetic coating compd. is rotationally oriented in a magnetic field. While the spherical fillers 4 are large in volume and surface area, the fillers hinder the movement of the magnetic powder 3, the acicular fillers 5 have the same shape as the shape of the magnetic powder 3 and are small in volume and surface area. This filler, therefore, facilitates the movement. The degradation in the orientability near the fillers and the generation of flocculation are thus reduced. The force of the above-mentioned pole is, therefore, weakened and the generation of microdefects by the crack, etc., of the coated film is suppressed.

2. 发明专利

JPH0278930A EVALUATING METHOD FOR MAGNETIC DISK MEDIUM 失效
公开(公告)号：JPH0278930A
公开(公告)日：1990-03-19
申请号：JP22997488
申请日：1988-09-16
申请人： HITACHI LTD
发明人： KATAOKA HIROSHI , MIYAKE YOSHIHIKO , KAZAMA TOSHINORI
IPC分类号： G01N3/56 , G11B5/84
摘要： PURPOSE:To observe a wear part in detail and to obtain the suitable evaluating method for the medium by exciting a magnetic disk in a specific direction, e.g. rotating direction at a specific period to a specific amplitude and wearing and peeling the surface of its magnetic layer. CONSTITUTION:A carriage 5 is moved to fix a magnetic head 2 at a specific position on the surface of the magnetic disk 1. Then a frequency generated by an oscillator 11 is amplified by an amplifier 10 and inputted to an exciter 9. The exciter 9 is fitted with an excitation rod 8, which vibrates as shown by an arrow 12. The magnetic disk 1 is vibrated finely in its circumferential direction 13 according to said vibration. At this time, the quantity of displacement of a disk clamp 6 is measured by a displacement sensor 14 and a displacement meter 15. The excitation frequency and amplitude are monitored on an oscilloscope 16 so as to hold the excitation conditions constant. Consequently, the generation part A of wearing caused as a result is observed is detail by SEM to obtain the suitable evaluating means for obtaining the disk medium with high filler holding force.

3. 发明专利

JPH01214735A EVALUATING METHOD OF CONTACT RESISTANCE 失效
公开(公告)号：JPH01214735A
公开(公告)日：1989-08-29
申请号：JP4017388
申请日：1988-02-23
申请人： HITACHI LTD
发明人： KATAOKA HIROSHI , MIYAKE YOSHIHIKO , KAZAMA TOSHINORI , HIGASHIYA TERUYOSHI
IPC分类号： G01N3/56 , G11B5/455 , G11B5/60 , G11B5/84
摘要： PURPOSE:To enable the selection of combination of a head having a high contact resistance with a magnetic disk, by a method wherein, after the magnetic disk is rotated, a spherical slider is vibrated vertically and the disk and the spherical slider are brought into contact with each other periodically. CONSTITUTION:A spherical slider 4, which is fitted to the fore end of a vibrating rod 7 through the intermediary of a gimbal support spring 5, is so constructed that it is vibrated forcedly in the vertical direction by vibrating the vibrating rod 7 at a prescribed period by a vibrator 6, so that a periodical contact thereof with a magnetic disk 1 may occur. On the occasion when evaluation of a head/the disk is executed, a carriage 9 is moved to position the slider 4 at a prescribed position on the surface of the disk 1, and the disk 1 is rotated normally. Next, at a time point when the disk 1 gets to regular rotation, the slider 4 is vibrated at a prescribed period by the vibrator 6 and thereby the periodical contact with the disk 1 takes place. The fore end of the slider 4 is worn by the contact with the disk 1. The volume of a worn part in various test times is calculated, and the amount of wear of the slider 4 is obtained thereby.

4. 发明专利

JPS63124531A METHOD OF CLEANING SMOOTH SURFACE 失效
公开(公告)号：JPS63124531A
公开(公告)日：1988-05-28
申请号：JP26973886
申请日：1986-11-14
申请人： HITACHI LTD
发明人： SUZUKI SHOJI , KOIBUCHI KOJI , KAZAMA TOSHINORI , KATAOKA HIROSHI , ITO YASUSHI
IPC分类号： B08B7/00 , G11B23/50 , H01L21/304
摘要： PURPOSE:To capture dust effectively, by applying aqueous solution in a resin state, in which polyvinyl alcohol powder and pure water are mixed, on a smooth surface to be cleaned, hardening the resin in the aqueous solution, and thereafter releasing the hardened resin from the smooth surface to be cleaned. CONSTITUTION:Aqueous solution in a resin state, in which polyvinyl alcohol powder and pure water are mixed, is applied on a smooth surface to be cleaned. After the resin in said aqueous solution is hardened, the hardened resin is released from the smooth surface to be cleaned. Namely, on a magnetic disc, whose surface is machined in a magnetic forming step 1, a resin, which is prepared by a resin forming step 2, is applied in an applying step 3. The resin is hardened in a hardening step 4. The resin is released from the magnetic disc together with dust in a releasing step. The releasing residue is washed out in a washing step 6. Thus the dust on the surface on the magnetic disc can be efficiently removed. The faults of the magnetic disc caused by the dust on the magnetic disc can be prevented.

5. 发明专利

JPS6316838B2 失效
公开(公告)号：JPS6316838B2
公开(公告)日：1988-04-11
申请号：JP19473282
申请日：1982-11-08
申请人： HITACHI LTD
发明人： IIDA MUNEO , SHIMIZU TAKEMASA , SUZUKI MASAMI , OKAMOTO NOBUYUKI , KAZAMA TOSHINORI , PPONDA MASANOBU , MOCHIDA JIRO , TADA SEIJI , FUJII MASAYUKI
IPC分类号： G11B17/038 , G11B25/04 , G11B33/14

6. 发明专利

JPH0581810A FLOATING HEAD SLIDER 失效
公开(公告)号：JPH0581810A
公开(公告)日：1993-04-02
申请号：JP24165891
申请日：1991-09-20
申请人： HITACHI LTD
发明人： HIGASHIYA TERUYOSHI , MIYAKE YOSHIHIKO , KAZAMA TOSHINORI
IPC分类号： G11B5/60 , G11B21/21
摘要： PURPOSE:To obtain a floating head slider having the feature such that a dust intruded between the floating head slider and a magnetic disk is caught and also the caught dust is hardly fallen off. CONSTITUTION:The floating force generating surface of a slider rail includes grooves 20. The grooves 20 are arranged near the flowing-out end on the floating force generating surface, and the surfaces connected to a flowing-in end forming the grooves are inclined upward obliquely facing to the flowing-out end, and an air flow is guided along these slopes to stick the dust in the air flow on the slopes by an eddy, etc., generated inside of the grooves. Since the dust deposited on the slopes always stays inside the grooves and does no protrude from the floating force generating surface, it does not come into contact with the surface of magnetic disk even if the floating head slider is inclined, and is not fallen off to the surface of magnetic disk.

7. 发明专利

JPH0310193B2 失效
公开(公告)号：JPH0310193B2
公开(公告)日：1991-02-13
申请号：JP18284182
申请日：1982-10-20
申请人： HITACHI LTD
发明人： TAKAHASHI HATSUO , MYAKE YOSHIHIKO , PPONDA MASANOBU , IIDA MUNEO , KAZAMA TOSHINORI , MOCHIDA JIRO , TADA SEIJI , FUJII MASAYUKI , OKAMOTO NOBUYUKI
IPC分类号： G11B5/60 , G11B21/21 , G11B33/14

8. 发明专利

JPH01256082A MAGNETIC HEAD 失效
公开(公告)号：JPH01256082A
公开(公告)日：1989-10-12
申请号：JP8290488
申请日：1988-04-06
申请人： HITACHI LTD , HITACHI ELECTR ENG
发明人： KAZAMA TOSHINORI , MIYAKE YOSHIHIKO , SUGIYAMA TOSHINORI
IPC分类号： G11B21/21
摘要： PURPOSE:To obtain a CSS type floating magnetic head with long service life and high reliability by making a core slider center rail floating face flat with respect to disk face and forming the side rail floating face as a curved face. CONSTITUTION:The cross section of the core slider center rail 1 is provided so that the floating face is made flat with respect to a disk 4. Moreover, the cross section of side rails 2, 2' is formed to be a curved face and part of a cylinder whose radius is R is used. As the radius R, the shape of the curved face is set, which is selected to a proper value depending on the length L of the floating face of the side rails 2, 2', the floating spacing and the elevating angle with respect to the disk 4 at floating or the like. Thus, a pressure exerted to an R/W gap 3 is positive and dust is hardly deposited, damage to the R/W gap 3 and defective R/W are prevented and a stable R/W output with a long service life of the head is obtained.

9. 发明专利

JPH0192922A MANUFACTURE OF MAGNETIC HEAD SLIDER 失效
公开(公告)号：JPH0192922A
公开(公告)日：1989-04-12
申请号：JP24978387
申请日：1987-10-05
申请人： HITACHI LTD
发明人： KAZAMA TOSHINORI
IPC分类号： G11B5/187 , G11B5/455 , G11B5/60 , G11B21/21
摘要： PURPOSE:To attain smooth R chamfering in the vicinity of a side rail and a center rail gap to a degree not losing the electromagnetic characteristic by exciting a magnetic head slider during high speed floating so as to bring it into contact with a magnetic disk thereby monitoring the electromagnetic characteristic. CONSTITUTION:The magnetic head 1 is floated at a high speed to a prescribed position on a magnetic disk 3 by a positioning mechanism 2 and after data is written on the disk by an electromagnetic characteristic tester 4, the magnetic head supported by a guide arm 5 is vibrated for a set time of the timer 9. The vibrating force in this case is grasped quantitatively by an acceleration sensor 10 fitted to the guide arm. Very smooth radius chamfering parts a, b are formed to the flowing in/out parts of the side rail and the center rail of the head slider through the vibration. Thus, the very smooth R chamfering is attained to the magnetic head slider and the contact between the head and disk in the actual state is reduced considerably, then the head crash resistance is improved.

10. 发明专利

JPS6339973B2 失效
公开(公告)号：JPS6339973B2
公开(公告)日：1988-08-09
申请号：JP2147483
申请日：1983-02-14
申请人： HITACHI LTD
发明人： OOTANI JUICHI , KAZAMA TOSHINORI
IPC分类号： G11B5/84 , G11B5/455 , G11B33/10

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