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公开(公告)号：JP2000137967A
公开(公告)日：2000-05-16
申请号：JP30890598
申请日：1998-10-29
Applicant: IBM
Inventor： TSUCHIDA HIROYASU , TSUDA SHINGO , BABA SACHIYO , SATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To reduce resonance caused by an air flow in a driving device by providing an opening portion having a specified aperture in a rib erected in the longitudinal direction of an arm section having a head slider attached to its tip. SOLUTION: A head suspension assembly(HSA) is provided with an arm section 3a having a head slider 2 attached to its tip, and the head slider 2 is loaded on a disk side by a spring, for example by a 2g load. Ribs 3b are formed on both sides of the longitudinal direction of the arm section 3a to maintain rigidity. In this case, plural opening portions 3c are formed in each of the ribs 3b to reduce a projection area. When the arm section 3a is formed by stainless steel machining, since the opening portion 3c is formed by etching, the dimension of the opening portion 3c is set larger than the plate thickness of the stainless steel, e.g. about 60 μm. By setting the aperture of the opening portion 3c with respect to the rib 3b equal to 10% or more, Karman's vortex generated in the downstream side of the rib 3b is reduced.
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公开(公告)号：JPH10293915A
公开(公告)日：1998-11-04
申请号：JP11758997
申请日：1997-04-21
Applicant: NIPPON MEKTRON KK , IBM
Inventor： HIRAI SATOSHI , TSUDA SHINGO , SATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide easiness of parts mounting and latitude in arrangement of a head pad by concentrically arranging a parts mounting part of an IC chip, etc., and a head pad arrangement part in a bent and overlapped state on surface/rear surface. SOLUTION: The parts mounting part 2 mounting the electronic parts 4 such as the IC chip, etc., is arranged in the vicinity of an end part of a flexible circuit board 1 for magnetic head, and the IC chip, etc., are covered properly by a sealing agent 5. Further, the head pad arrangement part 3 is provided successively on this board end part. The head pad arrangement part 3 of such a flexible circuit board 1 for magnetic head is arranged on the rear surface of the parts mounting part 2 such as the IC chip, etc., in the state being bent and overlapped, and a slit pin shape boss 12 of a mold reinforcement plate 8 is inserted into a temporarily stopping hole 7 from a side provided with the sealing agent 5 of the IC chip, etc., and the bent and overlapped state between the head pad arrangement part 3 and the parts mounting part 2 such as IC chip, etc., is temporarily stopped and held without adhesive, etc.
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公开(公告)号：JPH09282787A
公开(公告)日：1997-10-31
申请号：JP7485496
申请日：1996-03-28
Applicant: IBM
Inventor： SATO KIYOSHI , DEBITSUDO ARUBUREHITO , NEMOTO SUNAO
IPC: G11B19/20 , G11B17/022 , G11B33/08 , G11B33/14
Abstract: PROBLEM TO BE SOLVED: To reduce the deformation of a hub by providing a reduced stress region having an inner peripheral diameter of the hub in a part of a joined region larger than in other parts and reducing stress between the outer periphery of a sleeve and the inner periphery of the hub when a thermal expansion occurs because of a temperature change. SOLUTION: Because of a change in temperature, stress of vector A or B is produced in the full inner periphery of a hub, thus an imbalance occurs in a joined part between a hub 14 and a sleeve 11, distortion occurs in the hub and a thermal runout, that is, rotational shaking occurs in a disk loaded in the hub. The inner peripheral diameter of the center part of a joined region between the hub 14 and the sleeve 11 is larger than that of each of the upper and lower joined parts 24 and 25 of the joined region, thus a stress reducing region 23 is formed. In a left part V, a difference between the stress vectors A' and B' of the upper and lower ends of the reducing region is smaller than that between the vectors A and B. This is because no stress occurs between the hub 14 and the sleeve 11 caused by a linear expansion coefft. difference. By reducing the imbalance between the stress vectors, thermal runout is reduced.
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公开(公告)号：JPH04181018A
公开(公告)日：1992-06-29
申请号：JP30733390
申请日：1990-11-15
Applicant: IBM
Inventor： MASUDA YOSHIMI , SASAKI MASAKAZU , SATO KIYOSHI
Abstract: PURPOSE: To prevent frictional force from increasing by providing a cage holding a ball disposed between an inner race and an outer race of a bearing to be used for mounting a carriage supporting a head on a base within a prescribed range with a hole for supplying grease which extends toward the ball. CONSTITUTION: An upper bearing part 1U is provided with an outer race 8U which is disposed coaxially with an inner race 6U so as to be opposed to the inner race 6U and a cage 12U constituted of a hollow cylindrical member in which a plurality of recessed part 11U storing a plurality of balls 10U disposed between the inner race 6U and the outer race 8U one by one are formed on a lower surface. Because cages 12U, 12D are provided with holes 18U, 18D for supplying grease which extend toward each of balls 10U, 10D, grease is supplied to only balls 10U, 10D which actually require lubrication. Therefore, extra grease does not enter a gap between a shaft 2 and the cages 12U, 12D, and frictional force between the shaft 2 and the bearing 1 is not increased.
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公开(公告)号：JP2002254276A
公开(公告)日：2002-09-10
申请号：JP2001055103
申请日：2001-02-28
Applicant: IBM JAPAN , NHK SPRING CO LTD
Inventor： NAGATA TAKESHI , TSUCHIDA HIROYASU , UEMATSU YOSHIO , SATO KIYOSHI , TAMARU HIROSUKE
Abstract: PROBLEM TO BE SOLVED: To provide iron based parts with high cleanliness (e.g. a base plate of a suspension for a disk drive). SOLUTION: A base plate 20 made of a base material of stainless steel formed by press working is polished by an abrasive mainly composed of Fe2 O3 in a polishing process and is deburred. The base plate 20 after polishing is heated to a solution treatment temperature in a reducing atmosphere during a heat treatment process. Through the heat treatment process, an oxide of ingredients in broken micro pieces of the abrasive existed on the face of the base material of the base plate 20 is reduced to leave iron and the iron is diffused in the base material.
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Patent Agency Ranking
公开(公告)号：JP2001126445A
公开(公告)日：2001-05-11
申请号：JP30060399
申请日：1999-10-22
Applicant: IBM
Inventor： TSUDA SHINGO , SATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a hard disk drive capable of suppressing flattering and the increase of power consumption in fast rotation while improving the seeking speed of a magnetic head. SOLUTION: An enclosure case 16 has a 3.5 inch form factor and a magnetic disk 22 has 84 mm external diameter, e.g. The center of the disk 22 is not matched with the canter in the width direction of the case 16 but deviated from it. Thus, a voice coil 32 is designed to be large to improve the driving speed of an actuator 26.
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公开(公告)号：JPH10269728A
公开(公告)日：1998-10-09
申请号：JP7551597
申请日：1997-03-27
Applicant: IBM
Inventor： UEDA TETSUO , SATO KIYOSHI , ONO HIROYUKI , WADA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To raise the allowable value of the track width direction velocity of a head immediately after the end of seek operation in which the head position is unstable in order to prevent the off-track recording by inhibiting the write operation of head when the track width direction velocity of head exceeds the allowable value. SOLUTION: With the data writing instruction, a hard disk controller HDC 10 controls a micro-processor unit MPU 6 to move a magnetic head 2 to the target track. HDC 10 causes the magnetic head 2 to move on the target track through the track following control with a position error RES signal supplied from a servo sector reproducing unit 8a to start the write operation. In the writing operation at the off-track position, since the adjacent track data may probably be broken, the allowable position error of the magnetic head 2 is set and when PES from the target track exceeds the allowable position error, the write operation is inhibited. Moreover, when the track width direction velocity of magnetic head is higher than the allowable value, since PES may probably exceed the position error, the write operation is inhibited.
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公开(公告)号：JPH04278214A
公开(公告)日：1992-10-02
申请号：JP6536091
申请日：1991-03-07
Applicant: IBM
Inventor： AOYANAGI AKIHIKO , JIERII TEII KOFUII , SATO KIYOSHI
Abstract: PURPOSE: To make the head carriage assembly thin by fixing a mount board of a suspension supporting a head slider to a side face of an arm coupled with a head positioning device including a voice coil and a motor or the like. CONSTITUTION: A suspension 4 supporting a magnetic head slider 2 used to read and write data from/to a magnetic disk is fixed to a side face 6S of a rigid arm 6 made of an aluminum die-cast coupled with a head positioning device including a voice coil and a motor or the like positioning the magnetic head onto an object rack of a magnetic disk. Since the suspension is fixed to the side face 6S of the arm in this way, it is not required to make a thread hole to the arm in the vertical direction and the thickness of the head carriage assembly is made thin.
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9.发明专利
公开(公告)号：JP2001116633A
公开(公告)日：2001-04-27
申请号：JP27588399
申请日：1999-09-29
Applicant: IBM
Inventor： SOGA EIJI , TSUDA SHINGO , SATO KIYOSHI
IPC: G01L1/16 , G01R31/02 , G11B5/48 , H01L41/047 , H01L41/08 , H01L41/113 , H01L41/22 , H01L41/313 , H02K33/18
Abstract: PROBLEM TO BE SOLVED: To provide a piezoelectric sensor not allowing sacrifice of either workability in soldering of a lead wire to one electrode of the piezoelectric sensor or workability in joining and fixing of the other electrode to a prescribed member with an adhesive, allowing prevention of a short circuit between the electrodes by the protruding adhesive when joining and fixing the ground electrode of the piezoelectric sensor to an electroconductive portion of a measured member with the adhesive, and allowing easy inspection of electrical connection between the ground electrode and the electroconductive portion of the measured member. SOLUTION: Two electrodes 18b, 18c of a piezoelectric sensor 18 are respectively composed of an electrode member suitable for soldering and an electrode member suitable for joining with an adhesive. The ground electrode 18c of the piezoelectric sensor 18 is joined and electrically connected to a measured member 7b with the non-electroconductive adhesive. By measuring a capacitance between the output electrode 18b of the piezoelectric sensor 18 and the measured member 7b, the electrical connection is checked.
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公开(公告)号：JP2001099147A
公开(公告)日：2001-04-10
申请号：JP27022899
申请日：1999-09-24
Applicant: IBM
Inventor： MATSUZAKI SHINICHI , OYAMA AKIHIRO , TAKEUCHI KOICHI , SATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To solve a problem that, when a ceramic ball is used as a rolling body of a bearing used in bearing mechanism, an unstable factor such as excessive preload and preload loss is caused so that working temperature condition is limited, since a ceramic member has a low linear expansion coefficient against the other member, although it is desired to use ceramic for durability and vibration resistance. SOLUTION: With respect to a shaft 34 (stainless steel) for retaining inner rings 33a, 34a of a pair of bearings 33, 34, a sleeve 40 (aluminum) is formed of a member having a high linear expansion coefficient to retain outer rings 33b. A change rate of a temperature of a distance X between the outer rings 33b is made to be higher than that of a distance Y between the inner rings 33a, 34a, so that difference of change in dimension of the inner rings 33a, 34b, outer rings 33b, and a rolling body is compensated by difference of change in dimension of a distance between the bearings.
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