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1. 发明专利

JPH01173311A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH01173311A
公开(公告)日：1989-07-10
申请号：JP33023887
申请日：1987-12-28
申请人： HITACHI LTD
发明人： NAKANISHI MICHIHIRO , SUZUKI MASAMI , UNE TOKUKI , SUZUKI TOMIO , NISHIDA HIROSHI
IPC分类号： G11B5/60 , G11B5/48 , G11B5/55 , G11B33/14
摘要： PURPOSE:To prevent an off-track from being generated due to the deformation of a head arm even when an integrated circuit is heated at a recording time by fitting the integrated circuit to the head arm so as to be positioned in a side which is inner than the outermost circumference of a magnetic gap during recording operation at least. CONSTITUTION:An integrated circuit 6 is loaded on a head arm 4 and the recording and reproducing of information are controlled by the instruction of a controlling device. Then, the writing and reading of a signal to a magnetic head 3 are executed. At the recording time, the integrated circuit 6 is fit to the head arm 4 so as to be positioned in the side inner than the outermost circumference of a magnetic disk 1. Even when the integrated circuit 6 is heated at the recording time, since a high speed air flow is generated in the magnetic disk 1 with being accompanied the high speed revolution of the magnetic disk 1, the quantity of heat to be generated in the integrated circuit 6 is speedily cooled by this high speed air flow and the head arm 4 does not get to be deformed. Accordingly, the off-track can be prevented from being generated by the deformation of the head arm 4.

2. 发明专利

JPH01138470A INSPECTION SYSTEM FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH01138470A
公开(公告)日：1989-05-31
申请号：JP29516587
申请日：1987-11-25
申请人： HITACHI LTD , HITACHI COMPUTER PERIPHERALS , HITACHI SHONAN DENSHI
发明人： NAKANISHI MICHIHIRO , SUZUKI MASAMI , UNE TOKUKI , SUZUKI TOMIO , NISHIDA HIROSHI , MIHASHI HIROYUKI , MOCHIDA JIRO , MATSUMOTO NORIHIKO , SAHODA EIJI , SAITO TOSHIHIKO
IPC分类号： G01R31/00 , G11B21/10
摘要： PURPOSE:To improve the reliability of the magnetic disk device by deciding whether or not an actuator is normal according to the detection result of variation in external force operating on the actuator by measuring the driving signal of the actuator. CONSTITUTION:When a measurement system is initialized, the internal memory of a microcomputer 20 is cleared and then the range of a digital voltmeter 19 is set and a return-to-zero instruction is sent to the magnetic disk device MD through a controller 18. Then the return-to-zero instruction is executed and the device MD enters a track follow state, the current voltage 17a of a zero track is measured, sent to the computer 20, and stored in its internal memory. Then, the 1st track is accessed and similar operation is carried out up to the innermost circumferential track as the largest track. Then, the voltage 17a is measured as to all tracks and an external force value is calculated based upon the voltage 17a and a force constant determined by the voice coil motor of the device MD and printed out 21 as to all track.

3. 发明专利

JPH0192986A SERVO SIGNAL WRITER FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0192986A
公开(公告)日：1989-04-12
申请号：JP24978087
申请日：1987-10-05
申请人： HITACHI LTD
发明人： NAKANISHI MICHIHIRO , SUZUKI MASAMI , NISHIDA SADAJI , MOCHIDA JIRO
IPC分类号： G11B33/14 , G11B33/12
摘要： PURPOSE:To obtain a system with less write error and high productivity by reducing an enclosed package with a servo signal writer stored therein in writing position information by a prescribed pressure. CONSTITUTION:A servo signal writer consists of a write head 1 writing a position signal to a servo disk 8 of a magnetic disk device 7, a carriage 2 supporting the head 1, a position detection section 3, and a base 4 supporting the carriage 2 and the magnetic disk device 7. Moreover, the device is stored in an enclosed package 5, the pressure is reduced by a vacuum pump 6 to keep a prescribed pressure. Since the write head 1 is not susceptible to the effect of air flow by the reduction in air molecules due to the pressure reduction, the vibration is less. Since the magnetic disk device 7 is driven at a real operating number of revolutions, the position deviation attended with the difference from the number of revolutions is not caused. Thus, the position information is written with less write error, the system is effective to improve the position accuracy and the recording density.

4. 发明专利

JPS63293779A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63293779A
公开(公告)日：1988-11-30
申请号：JP12810287
申请日：1987-05-27
申请人： HITACHI LTD
发明人： KAWAMURA TOSHIRO , SUZUKI MASAMI , NAKANISHI MICHIHIRO , SUZUKI TOMIO , NISHIDA HIROSHI
IPC分类号： G11B21/21 , G11B25/04
摘要： PURPOSE:To suppress the occurrence of vibration and thermal displacement of a magnetic disk, etc., and to improve the positioning accuracy of a head by setting up a plate member between the magnetic heads disposed on a parallel line to a spindle and in parallel to the magnetic disk. CONSTITUTION:The plate member, which at least bisects a space between the magnetic disks 1 in an area adjacent to a head arm 4, is set up between the magnetic heads 3 disposed on the parallel line to the spindle 2 in parallel with the magnetic disk 1. That is, the straightening of an airflow is performed by a partition plate 6 in an access operation. This partition plate 6 acts to straighten the airflow between the magnetic disks and to prevent the magnetic head 3 from vibrating unnecessarily due to turbulence and also to bisect the space between the magnetic disks, thus shifting the airflow between the magnetic disks from the turbulence to a laminar flow, so that the airflow is straighten and the vibration of the magnetic head is reduced.

5. 发明专利

JPS60251582A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS60251582A
公开(公告)日：1985-12-12
申请号：JP10453684
申请日：1984-05-25
申请人： HITACHI LTD
发明人： NAKANISHI MICHIHIRO , YAMAMOTO FUJIO
IPC分类号： G11B33/14
摘要： PURPOSE:To uniform temperature distribution among magnetic disks and to prevent a thermal off-track state by providing a straightening member with a group of rod-shaped arms which are inserted between the magnetic disks and extend radially, and making the arms different in insertion length among the disks. CONSTITUTION:A carriage 4 mounting a servo head 3a and data heads 3b which reading and writing information out of and on a servo disk 1a and plural data heads 1b moves on a base 5, the arms of the rectifying member 6 are inserted between disks, and the whole is sealed hermetically with a cover 9. The straightening member 6 straightens air between disks with its arms to prevent unnecessary oscillations of the heads 3a and 3b due to turbulence. The arms of the straightening member 6 vary in length or width according to temperatures between disks to vary the heating value due to wind loss and uniform the temperature distribution, and the difference in thermal expansion between the servo head 3a and data heads 3b is eliminated to prevent the thermal off-track state.

6. 发明专利

JPS6450293A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS6450293A
公开(公告)日：1989-02-27
申请号：JP20523787
申请日：1987-08-20
申请人： HITACHI LTD
发明人： SUZUKI MASAMI , NISHIMURA YUJI , UNE TOKUKI , NAKANISHI MICHIHIRO , NISHIDA HIROSHI
IPC分类号： G11B21/21 , G11B33/14
摘要： PURPOSE:To prevent data from being destructed due to the sliding of a magnetic head with a magnetic disk, by providing a means to detect the temperature of the magnetic head or the magnetic disk, or both temperature of them. CONSTITUTION:The means to detect the temperature of the magnetic head or the magnetic disk, or both of them is provided. For example, since the temperature of a contact part is raised to around 400k due to frictional heating when a servo head core slider 1s slides with the magnetic disk 2, a deviation quantity (delta) at that time shows around 15mum, which can be detected by a transducer part 52' satisfactorily. When such status is generated, by displaying an alarm or stopping a device automatically by interlocking with an output signal from the transducer part 52', it is possible to prevent magnetic recording information from being destructed.

7. 发明专利

JPS63317991A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63317991A
公开(公告)日：1988-12-26
申请号：JP15305487
申请日：1987-06-19
申请人： HITACHI LTD
发明人： UNE TOKUKI , NISHIDA HIROSHI , SUZUKI TOMIO , SUZUKI MASAMI , NAKANISHI MICHIHIRO
IPC分类号： G11B21/02 , G11B21/16
摘要： PURPOSE:To prevent the production of offtrack due to the relative relation of position of each magnetic head by changing equally the length of plural head arms in response to the temperature change if a temperature change is caused to the entire magnetic disk device. CONSTITUTION:In setting the length of each head arm 4, a servo head arm 4a is used as a reference head arm to measure the linear expansion coefficient. The linear expansion coefficient is measured for other arms 4, the product between the length l5 of the arm 4a and the linear expansion coefficient of the arm 4a is divided by the linear expansion coefficient of the arm 4 obtained by the measurement to calculate the length (l) of the arm 4. Moreover, in mounting the arm 4 to the arm holder supporting the arm 4, the arms are assembled so that the length of the head arm tip and the fixed position give a desired length. Thus, the product between the length l5 of the arm 4a and its linear expansion coefficient is made equal to the product the length (l) of the arm 4 and its linear expansion coefficient.

8. 发明专利

JPS63266675A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63266675A
公开(公告)日：1988-11-02
申请号：JP9972087
申请日：1987-04-24
申请人： HITACHI LTD
发明人： SUZUKI MASAMI , UNE TOKUKI , NAKANISHI MICHIHIRO , SUZUKI TOMIO , NISHIDA HIROSHI
IPC分类号： G11B21/02 , G11B25/04
摘要： PURPOSE:To reduce a degree of off-track of a magnetic disk due to a temperature change by paralleling the direction of a tightening force for jointly fixing a guide rail with a base to the magnetic disk. CONSTITUTION:The tightening direction (g) of the guide rail 4 to the base 5 is set up in parallel to the disk 1. For this, even if the guide rail 4 is deformed due to a thermal stress, an actuator 2 is merely changed in its posture, and also a servo head and a magnetic head 7 is only changed in relation to the magnetic disk 1 by the same amt. of said deformation, thus generating no positional discrepancies between individual heads. By this method, even if a positional change deltas of the magnetic head 7 takes place, there is no problem at all as to the positioning performance of the magnetic head 7, and consequently the head positioning control is feasible with high accuracy.

9. 发明专利

JPS63259885A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63259885A
公开(公告)日：1988-10-26
申请号：JP9304487
申请日：1987-04-17
申请人： HITACHI LTD , HITACHI COMPUTER PERIPHERALS
发明人： MIHASHI HIROYUKI , SUZUKI MASAMI , SUZUKI TOMIO , NISHIDA HIROSHI , TAKAHASHI TAKESHI , NAKAKOSHI KAZUO , NARUSE ATSUSHI , NISHIMURA YUJI , NAKANISHI MICHIHIRO
IPC分类号： G11B25/04 , G11B21/02 , G11B33/08 , G11B33/12
摘要： PURPOSE:To attenuate the vibrations produced by the positioning drive and to extremely improve the positioning accuracy for a magnetic disk device, by providing an additional mass member which can move toward the functioning direction of the positioning drive force for a magnetic head and a means which presses said mass member. CONSTITUTION:A movable coil 5 set at the back of an actuator 4 which supports a magnetic head 3 is put into a magnetic circuit 6. Thus the coil 5 is energized with conduction to produce the electromagnetic drive force and performs the positioning operation of the actuator 4. The circuit 6 receives the reaction (f) with the positioning drive applied in the direction D and a movable mass 7 is moved up to a position (x) by the warp of a spring 8 and the function of a dashpot 11 to be balanced with the reaction. As a result, the circuit 6 has no displacement and no vibration is transmitted to a spindle 1 nor a disk 2. Thus the head 3 is positioned with high accuracy.

10. 发明专利

JPS62239322A MAGNETIC DISK 失效
公开(公告)号：JPS62239322A
公开(公告)日：1987-10-20
申请号：JP8011786
申请日：1986-04-09
申请人： HITACHI LTD
发明人： NAKANISHI MICHIHIRO , HONDA MASANOBU
IPC分类号： G11B5/72 , C09D5/23 , G11B5/725 , G11B5/73 , G11B5/82
摘要： PURPOSE:To keep the effect of a lubricating coated film for a long period and to prevent the damage of the surface of a magnetic head and head crash over a long period by maximizing the thickness of the lubricating coated film at the outermost peripheral part of the magnetic disk, and decreasing the thickness from the outer peripheral side to the inner peripheral side. CONSTITUTION:Iron oxide (not shown in the figure) and an epoxy resin (not shown in the figure) are coated on a high-purity Al substrate 1, and cured to form a magnetic medium layer 2. A filler 3 is incorporated in the magnetic medium layer 2 as a reinforcing agent. The lubricating coated film 4 is present on the surface of the magnetic medium layer 2, and protects the disk surface. The thickness of the lubricating coated film is maximized at the outermost peripheral part of the magnetic disk, and gradually decreased toward the inner peripheral side. A soln. of a lubricant is sprayed on the surface of the magnetic disk by a spraying system to form the lubricating film 4, and the film thickness can be effectively regulated by controlling the spraying quantity.

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