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公开(公告)号：DE69013188D1
公开(公告)日：1994-11-17
申请号：DE69013188
申请日：1990-03-08
Applicant: IBM
Inventor： HATCHETT MICHAEL ROBERT , HEARN ANTHONY ROGER , HEATH JOHN STEWART , LACEY CHARLES MICHAEL , LAREK THADDEUS LOUIS , REIDENBACH JOHN RALPH , SCWIETERS CLARENCE RAYMOND
Abstract: A linear actuator for positioning the heads of a disk file relative to tracks on the disks employs a ceramic material having wear properties superior to steel in guide surfaces for guiding a head supporting carriage running on rotary bearings in contact with the guide surfaces. The preferred ceramic material is tetragonally stabilized zirconia.
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公开(公告)号：DE3673011D1
公开(公告)日：1990-08-30
申请号：DE3673011
申请日：1986-05-08
Applicant: IBM
Inventor： HATCHETT MICHAEL ROBERT , HEATH JOHN STEWART
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公开(公告)号：DE3067011D1
公开(公告)日：1984-04-19
申请号：DE3067011
申请日：1980-10-07
Applicant: IBM
Inventor： DICKIE HUGH GRAHAM , HEARN ANTHONY ROGER , HEATH JOHN STEWART
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公开(公告)号：DE2964950D1
公开(公告)日：1983-04-07
申请号：DE2964950
申请日：1979-06-19
Applicant: IBM
Inventor： HEATH JOHN STEWART
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Patent Agency Ranking
公开(公告)号：FI792613A
公开(公告)日：1980-03-03
申请号：FI792613
申请日：1979-08-22
Applicant: IBM
Inventor： HEATH JOHN STEWART
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公开(公告)号：GB1217809A
公开(公告)日：1970-12-31
申请号：GB3968769
申请日：1969-08-08
Applicant: IBM
Inventor： HEATH JOHN STEWART
Abstract: 1,217,809. Control of stepping motors. INTERNATIONAL BUSINESS MACHINES CORP. 8 Aug., 1969, No. 39687/69. Heading H2J. [Also in Division G3] A stepping motor has stator windings 1-4: adapted to be energized in pairs, the rotor being located between a pair of windings at the end of each step. An encoder comprises a disc mounted on the rotor shaft and having a semi-circular slot associated with photo-sensitive devices P, Q, which produce pulses on lines 13, 14 when the slot allows the passage of light, the duration and repetition rate of the pulses being dependent upon the rotor velocity. The lines 13, 14 are connected to a logic network arranged so that a signal on line 18 for clockwice rotation energizes windings 1 or 3 provided that device Q is " on " or " off." A signal on line 21 for anticlockwise rotation energizes windings 3 or 1 when the device Q is " on " or " off." The windings 2 or 4 are energized in response to the " on " and " off " state of the device P. A line 29 is energized or de-energized for clockwise or anticlockwise operation respectively. When lines 29 and 36 are energized, for example, a signal appears on line 18. A step-down counter C is loaded with the step-count and is decremented by a pulse network 41 which supplies a pulse for each step of the motor. At a predetermined number of steps before the desired destination, line 38 is energized to reduce the stepping rate so that, during clockwise motion, lines 37, 21 are energized and a reverse torque is applied to the motor for an interval equal to the duration of a pulse from unit 40. If the original speed is high, the reverse torque is applied during each step until a low stable speed is reached whereupon the reverse torque is followed by a forward torque during each step. When the counter reaches a count of one, line 44 is energized and the motor is retarded further for a period determined by unit SS1, at the end of which a mechanical detent locks the motor at its desired destination. The speed of the motor is stabilized at a higher value, before the counter is decremented to the predetermined number, by allowing the motor to coast for a fixed period determined by unit 63 during each step. If the step interval is smaller than the period of unit 63, the motor windings are de-energized. If the step interval becomes greater, than the said period, the line 28 is energized for the remainder of each step interval. In another arrangement, the motor is coupled to a tachometer generator which is connected to a differential amplifier producing a direct voltage proportional to the difference between the actual and required speeds of the motor. The output of the amplifier increases the period of a single-shot unit to decrease the speed when the tachometer voltage exceeds a reference voltage, Fig. 3 (not shown).
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公开(公告)号：DE69318605D1
公开(公告)日：1998-06-25
申请号：DE69318605
申请日：1993-03-02
Applicant: IBM
Inventor： HATCHETT MICHAEL ROBERT , HEATH JOHN STEWART , LEE HUBERT CHEW , ROW EUN KYOUNG , SPENCER ROGER DALE , WORKMAN MICHAEL LEE
Abstract: A multiple disk drive assembly (10) in a 5 1/4 inch disk drive form factor having two 3 1/2 inch disk drive form factor head-disk assemblies (HDA) (11, 13) internally mounted on a rigid frame (15) and accessible via a common industry-standard interface connector (55) is provided. Both the interface and power connectors (55 and 53 respectively) and the frame mounting hole patterns are industry standard to provide interchangeability with 5 1/4 inch form factor disk drives provided by manufacturers for use in computer systems. A single electronics controller board (17) is shared by both HDAs and is mounted on the bottom side of the frame below the HDAs. The controller board may implement SCSI or IPI interfaces in either differential or single-ended versions. A spring vibration damper (47) is utilized to minimize external vibration and shock effects on the HDAs and also to minimize the effects of vibration internally generated by one HDA on the adjacent HDA. The assembly is fully enclosed with metal top and bottom covers (19 and 21 respectively) to provide separate enclosures for the HDAs and the controller board cooling and to provide EMC and RFI protection.
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公开(公告)号：SG44367A1
公开(公告)日：1997-12-19
申请号：SG1995002341
申请日：1993-03-02
Applicant: IBM
Inventor： HATCHETT MICHAEL , HEATH JOHN STEWART , LEE HUBERT CHEW , ROW EUN KYOUNG , SPENCER ROGER DALE , WORKMAN MICHAEL LEE
Abstract: A multiple disk drive assembly (10) in a 5 1/4 inch disk drive form factor having two 3 1/2 inch disk drive form factor head-disk assemblies (HDA) (11, 13) internally mounted on a rigid frame (15) and accessible via a common industry-standard interface connector (55) is provided. Both the interface and power connectors (55 and 53 respectively) and the frame mounting hole patterns are industry standard to provide interchangeability with 5 1/4 inch form factor disk drives provided by manufacturers for use in computer systems. A single electronics controller board (17) is shared by both HDAs and is mounted on the bottom side of the frame below the HDAs. The controller board may implement SCSI or IPI interfaces in either differential or single-ended versions. A spring vibration damper (47) is utilized to minimize external vibration and shock effects on the HDAs and also to minimize the effects of vibration internally generated by one HDA on the adjacent HDA. The assembly is fully enclosed with metal top and bottom covers (19 and 21 respectively) to provide separate enclosures for the HDAs and the controller board cooling and to provide EMC and RFI protection.
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公开(公告)号：DE3581544D1
公开(公告)日：1991-02-28
申请号：DE3581544
申请日：1985-10-31
Applicant: IBM
IPC: G11B17/038 , G11B21/02 , G11B25/04 , G11B33/14 , G11B23/03
Abstract: A disk file comprises a disk stack subassembly (10) and a head positioning actuator (50) each mounted on opposite sides of a central box frame (81). The disk stack subassembly (10) has a non-rotating central spindle (11) and an in-hub electric motor (30) whose stator (32) is mounted on the spindle (11). The rotor (31) of the motor (30) is mounted internally of a hub (15) supported for rotation about the spindle by two bearings (16, 17) at opposite ends of the spindle (11). A stack of disks (18) is mounted externally on the hub (15). The box frame (81) is open to one side and the opposite ends of the stationary spindle (11) are located and fixed in the frame (81) so that the disk stack subassembly (10) spans the open side. Because of the symmetry and rigidity of the design, susceptibility to thermal or vibration induced misregistration is reduced. Finally a cover (90) completes the enclosure.
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