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31. 发明专利

JPS5570969A LOAD SYSTEM FOR MAGNETIC HEAD 失效
公开(公告)号：JPS5570969A
公开(公告)日：1980-05-28
申请号：JP14419078
申请日：1978-11-24
申请人： HITACHI LTD
发明人： SOGABE CHIKAYUKI
IPC分类号： G11B21/21 , G11B5/60
摘要： PURPOSE:To simplify the unit and to make the unit longer in life, by specifying the construction of slider of magnetic head. CONSTITUTION:The shape of the slider 8 of the magnetic head 2 is made to wedge shape, and the pressure increase plate 7 is provided at the upper (back side) side. Thus, when the magnetic disc 1 is turned with the drive motor via the belt 4 and spindle 3, the air flow produced touches the pressure increase plate 7 and the slider 8, the slider 8 is depressed to the side of the magnetic disc 1, and the magnetic head 2 performs write-in and readout of information while keeping floating condition in a given fine distance to the magnetic disc 1 with a given number of revolutions. Accordingly, the magnetic head 2 and the magnetic disc 1 are not contacted to prevent the mutual wear and damage due to contact. Since no fast start and fast stop are required as in the contact start stop system, the drive motor is made smaller and the fast stop brake set is made unnecessary.

32. 发明专利

JPH0358355A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0358355A
公开(公告)日：1991-03-13
申请号：JP19145589
申请日：1989-07-26
申请人： HITACHI LTD
发明人： SOGABE CHIKAYUKI , AMANO HIDEAKI , TAKATSUKA AKIO
IPC分类号： G11B21/02
摘要： PURPOSE:To contrive miniaturization and high performance of the subject device with less offset amt. by integrating a swing arm fitted on its one end with a coil of a voice-coil motor and on the other end with a head respectively with a light alloy. CONSTITUTION:The swing arm 1 is integrally cast in a light alloy in the die-cast or lost-wax method. Then, the arm 1 is freely rotatable via a bearing 5 around a shaft 16. Plural arms are projected onto a straight line from one side of this arm 1, heads 3, whereas only one servo head 22 is fitted. The method for fixing the arm 1 with the head 3 and the servo head 22 is to bond them together to be fixed. Then, the VCM coil 2 is fitted on the other end, and coat ing is applied on fitting surfaces of the coil 2 and the arm 1, which are then bonded together with an epoxy resin of an improved insulating property.

33. 发明专利

JPH0234111B2 失效
公开(公告)号：JPH0234111B2
公开(公告)日：1990-08-01
申请号：JP19298783
申请日：1983-10-16
申请人： HITACHI LTD
发明人： HISHINUMA TOSHIO , SOGABE CHIKAYUKI
IPC分类号： G11B33/14 , G11B19/20 , G11B21/02 , G11B25/04

34. 发明专利

JPH0281395A OUTSIDE AIR VENT HOLE CONSTRUCTION FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0281395A
公开(公告)日：1990-03-22
申请号：JP23231888
申请日：1988-09-19
申请人： HITACHI LTD
发明人： TAKATSUKA AKIO , AMANO HIDEAKI , SOGABE CHIKAYUKI , KOIZUMI YUICHI , AIHARA HIROHISA
IPC分类号： G11B33/14
摘要： PURPOSE:To improve workability such as the replacement of air in a device and a dry air after a device is assembled by providing two outside air vent holes, sealing one side vent hole by an attachable detachable member from a device external part, fixing a filter from a device internal part to other side vent hole and fitting attachably detachably the diaphragm member from the device external part. CONSTITUTION:At the lower part of a base 1, vent holes 26 and 27 for replacement of the dry air of air in HDA at the time of the assembling work, measuring the density and measuring the dust are provided. Into the vent hole 26, a rubber member 26 to close the vent hole 26 at the time of an ordinary device action, into other side vent hole 27, a filter 5 is bonded and fixed from the internal part of the base 1, and a member 6 to form the diaphragm to limit the flowing quantity of air including moisture from the outside of the base 1 into an HDA(head disk assembly) is attachably detachably fixed. Thus, at the time of assembling a device, the replacement work of the dry air in the device is facilitated at the time of assembling the device.

35. 发明专利

JPH0278070A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0278070A
公开(公告)日：1990-03-19
申请号：JP22869588
申请日：1988-09-14
申请人： HITACHI LTD
发明人： HOSOKAWA HARUHIKO , AMANO HIDEAKI , SHIONO TOSHIO , TAKATSUKA AKIO , SOGABE CHIKAYUKI , ISHIDA ATSUO , AIHARA HIROHISA , KOIZUMI YUICHI , HANADA KAZUYOSHI
IPC分类号： G11B21/02 , H02K33/18
摘要： PURPOSE:To equalize distortion due to thermal deformation, and to decrease a thermal off-track quantity when a circumferential temperature and a device temperature are changed by forming the constituting components of a head positioning mechanism with aluminum, and unifying materials. CONSTITUTION:The components of a head positioning mechanism 15, namely, a carriage 7, a head arm 3, an arm spacer 6, a bobbin 5, a clamp 8 and a coil 11 of a VCM (voice coil motor), are formed by the aluminum, and linear expansion coefficients are matched. Consequently, the distortion due to the thermal deformation of the components of the mechanism 15 is equalized, and the thermal off-track quantity is decreased. In addition, the VCM coil bobbin and the arm spacer coil are made into a single component of the bobbin 5, a VCM bobbin loading space is used as a VCM magnet and a yoke loading space, its width is increased, and VCM power is increased. Thus, a recording density, an access time and reliability can be improved.

36. 发明专利

JPH01290164A SPINDLE STRUCTURE FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH01290164A
公开(公告)日：1989-11-22
申请号：JP11911888
申请日：1988-05-18
申请人： HITACHI LTD
发明人： TAKATSUKA AKIO , AMANO HIDEAKI , FUKUNAGA KIYOSHI , GOTOU MARUTOMO , INOUE YOICHI , SOGABE CHIKAYUKI , AIHARA HIROHISA , SHIONO TOSHIO , NARUSE ATSUSHI , TAKAHASHI TAKESHI , SASAMOTO ASAO , SHIMIZU HIDEKI , HOSOKAWA HARUHIKO
IPC分类号： G11B19/20
摘要： PURPOSE:To prevent thermal off-track, which is caused by thermal displacement, by providing a revolvable sleeve, a rotor and a hub, which is fixed to the sleeve in a partial area and loads a magnetic disk. CONSTITUTION:A cylinder-shaped sleeve 22 is inserted between bearings 24 and 25 and a hub 21 and a magnet (rotor) 23 is provided on an inner circumfer ence surface which is almost central in the shaft direction of the united sleeve 22. The united sleeve 22 is prepared by a magnetic substance, whose thermal expansion coefficient is almost same as the materials of the bearings 24 and 25, to strengthen the magnetic force of the magnetic and to play the role of a yoke. Accordingly, even when thermal expansion is generated in the bearings 24 and 25 and united sleeve 22, the both bearings and sleeve are expanded almost equally. The united sleeve 22 and hub 21 are not contacted in an area excepting for the joining part of a circle-shaped fine area and the thermal expansion is equally generated in correspondence to the thermal expansion coefficient of the hub 21 itself. Thus, unequal deformation in the respective parts of the hub 21, which is generated by joining between the difference types of metal, the inclination of the magnetic disk and the inclination of a revolving shaft 26 are removed and the thermal off-track can be prevented.

37. 发明专利

JPH01192065A MAGNETIC HEAD DEVICE 失效
公开(公告)号：JPH01192065A
公开(公告)日：1989-08-02
申请号：JP1457388
申请日：1988-01-27
申请人： HITACHI LTD
发明人： TAKATSUKA AKIO , SASAMOTO ASAO , MORIBE YOSHIHIRO , SHIONO TOSHIO , SOGABE CHIKAYUKI , HOSOKAWA HARUHIKO
IPC分类号： G11B21/21 , G11B5/48 , G11B21/02
摘要： PURPOSE:To improve responsiveness without increasing the mass and the moment of inertia of an actuator part by forming the shape of a rotary head arm on whose one end a magnetic head is mounted via a load spring and a gimbal spring sequentially so that rigidity at the upstream side of a wind flow can be set higher compared with the rigidity at the downstream side asymmetrically. CONSTITUTION:The head arm 8 is mounted via the load spring 7 and the gimbal spring 6 sequentially on one end, and the magnetic head 5 is mounted on the central axis 15 of the arm 8. The positioning of the head 5 in a prescribed data area on a magnetic disk 1 is performed by an actuator mechanism by turning the arm 8. A read/write IC16 is mounted on the arm 8 at the downstream side from the central axis 15 for an air flow generated by the revolution of the disk 1, and also, a punch hole 18 is provided at the side nearer to the downstream for the central axis 15, and the width of a joist at the upstream side is set larger than that of the joist at the downstream, which makes asymmetric shape, and the rigidity at the upstream side is set higher than the rigidity at the downstream side.

38. 发明专利

JPS6476467A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS6476467A
公开(公告)日：1989-03-22
申请号：JP23215587
申请日：1987-09-18
申请人： HITACHI LTD
发明人： NAKAMURA SHIGEO , AMANO HIDEAKI , YAMAURA SATORU , MATSUSHITA TOSHIO , SOGABE CHIKAYUKI
IPC分类号： G11B21/02
摘要： PURPOSE:To suppress mechanical vibration of the title device and thermal off-track and to facilitate the manufacturing by equalizing bearings for supporting an actuator oscillating part to a hollow structure body in their ther mal expansion coefficients and providing a radial pre-load material between an axis body and said bearings. CONSTITUTION:When a voice-coil motor of the magnetic disk device is driven, a magnet circuit is formed between a coil bobbin 7 and a magnet 8, and the actuator oscillating part 4 integrated with the bobbin 7 is rotated around the axis body 1 via the bearings 3, and then a magnetic head 6 mounted on the oscillating part 4 is rotated, thus constituting the device. Then, the axis body 1 is supported on its both ends by the hollow structure body 5 with its upper part and lower part, and each thermal expansion coefficient of the axis body 1 and the structure body 5 is equal to each other. In addition, plural bearings 3 are equal in their inner and outer diameters, and moreover, the radial pre-load material 2 is provided to be three point contacts with a fitting part between the inner ring of the bearings 3 and the axis body 1.

39. 发明专利

JPS63291279A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63291279A
公开(公告)日：1988-11-29
申请号：JP12577487
申请日：1987-05-25
申请人： HITACHI LTD , HITACHI COMPUTER PERIPHERALS
发明人： USHIJIMA NOBUYOSHI , YOKOYAMA NOBUHIRO , SOGABE CHIKAYUKI , HANADA KAZUYOSHI
IPC分类号： G11B21/21 , G11B19/02 , G11B19/20
摘要： PURPOSE:To release a sticking state without damaging a magnetic disk face and magnetic head face by simultaneously starting the driving of a magnetic disk and magnetic head, detecting the start of the rotation of the magnetic disk and stopping the driving of the magnetic head. CONSTITUTION:When a magnetic head 6 and magnetic disk 1 are in sticking state this sticking state can easily be released by simultaneously performing the driving of the magnetic head 6 and magnetic disk 1. On completion of the release the magnetic disk 1 starts its rotation by being driven by the spindle motor 3 for driving and the magnetic head 1 starts its movement in the radial direction of the magnetic disk 1 by being driven by a driving voice coil motor 8. A rotation detection circuit 11, then, detects the rotation of the spindle motor 3 immediately, its detection signal as given to the driving circuit of the voice coil motor 8 for driving the magnetic head and the feed of current is stopped. The sticking state can thus be released without giving any damage to the magnetic head 6 and disk 1.

40. 发明专利

JPS6289290A STORAGE DEVICE 失效
公开(公告)号：JPS6289290A
公开(公告)日：1987-04-23
申请号：JP22870985
申请日：1985-10-16
申请人： HITACHI LTD , HITACHI COMPUTER KIKI KK
发明人： USHIJIMA NOBUYOSHI , SOGABE CHIKAYUKI , ISHIKAWA ATSUSHI , HANADA KAZUYOSHI , YOKOYAMA NOBUHIRO
IPC分类号： G11B21/02 , G11B25/04
摘要： PURPOSE:To obtain a storage device which contains a signal circuit system and is free from faults due to the disconnection of a signal line, etc., by using a photoisolator to connect a traveling object and the fixed side. CONSTITUTION:A memory medium 1 is rotated by a spindle motor 2 and a magnetic head 3 serves as a storage device consisting of a carriage 6 which is positioned at an optional place on the medium 1 by a stepper 4 and a belt 5, a circuit 7 set on the carriage 6, a photodiode 8, a phototransistor 9 set in opposition to the photodiode 8, a bracket 10 which supports the transistor 9, a cable 11 through which power is supplied to the circuit 7, and a base 12 respectively. A photocoupler 13 consists of the photodiode 8 and the phototransistor 9. The signal of the head 3 is transmitted by the coupler 13 and only the cable 11 receives fatigue caused by the shift of the carriage 6. Thus the signal of the head 3 is relieved from the fatigue lifetime.

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