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公开(公告)号：JP2000293827A
公开(公告)日：2000-10-20
申请号：JP2000069132
申请日：2000-03-13
Applicant: IBM
Inventor： THOMAS ROBERT ALBRECHT , ROBERT CARL BARRETT , EATON JAMES HOWARD
Abstract: PROBLEM TO BE SOLVED: To facilitate the detection of a position signal error by determining the mutual time interval of plural prescribed magnetic flux transition couples in a servo pattern, generating a speed invariant position signal and detecting the position signal error so as to correlate a servo read head signal and the prescribed servo pattern recorded on a recording medium. SOLUTION: In a tape/head converting direction capable of reading the servo pattern, a servo read head 26 is relatively moved at the time of moving a tape straightly to the servo read head 26 along with the lengthwise direction of a center line 30 on a servo track. The servo read head 26 detects the servo pattern of a magnetic flux transition, generates an analog servo read signal and supplies it through a servo signal line 34 to a signal decoder 36. The signal decoder 36 processes the servo read signal, generates the position signal and supplies it to a servo controller 40.
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公开(公告)号：JP2000285427A
公开(公告)日：2000-10-13
申请号：JP2000069224
申请日：2000-03-13
Applicant: IBM
Inventor： THOMAS ROBERT ALBRECHT , ROBERT CARL BARRETT , EATON JAMES HOWARD
Abstract: PROBLEM TO BE SOLVED: To more easily detect a position signal error by setting a width of a servo read head to be smaller than half a width of a narrowest data read head when the width is defined as a size of the head in a direction perpendicular to a conversion direction. SOLUTION: A relative move of a servo read head 26 in a conversion direction of a tape head whereby the servo read head can read a servo pattern is generated when a tape 20 moves straight with respect to the servo read head 26 in a longitudinal direction of a center line 30 of a servo track. The servo pattern of a magnetic flux transition is detected, and a servo read head signal of an analog form is generated and supplied to a signal decoder 36. The signal decoder 36 processes the signal and supplies via a position signal line 38 to a servo controller 40. The servo controller 40 monitors a position signal from the signal decoder 36 and generates a control signal necessary for the head to reach a desired position.
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公开(公告)号：AT175802T
公开(公告)日：1999-01-15
申请号：AT95304190
申请日：1995-06-16
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BARRETT ROBERT CARL , EATON JAMES HOWARD
IPC: A63F7/02 , G11B5/265 , G11B5/58 , G11B5/584 , G11B5/596 , G11B21/10 , G11B5/54 , G11B5/55 , G11B5/48
Abstract: A track following servo system is disclosed for use with magnetic recording media 20 in which magnetic servo track 27 patterns contain transitions recorded at more than one azimuthal orientation across the width of the servo track. The timing of a signal derived from reading at any point across the width of such a pattern varies continuously as the read head is moved across the servo track. The pattern is read by a servo read head 26 whose width is small compared to the servo track pattern. The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range. In the preferred embodiment, the servo read head is also narrow with respect to the data tracks, which provides the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern, wear of the head, or debris collection. Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to medium speed during reading. The servo patterns may include spacing intervals 70 recognizable for error detection and correction purposes. The servo tracks may be recorded using a patterned multiple gap servo write head 400 whose magnetic gaps have geometries appropriate to generate the desired servo patterns.
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公开(公告)号：DE69117467T2
公开(公告)日：1996-10-02
申请号：DE69117467
申请日：1991-11-25
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , SPONG JAQUELIN KETNER , EATON JAMES HOWARD
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公开(公告)号：AU6930801A
公开(公告)日：2002-02-25
申请号：AU6930801
申请日：2001-07-06
Applicant: IBM
Inventor： BISKEBORN ROBERT GLENN , CHILDERS EDWIN RALPH , EATON JAMES HOWARD
IPC: G11B15/60
Abstract: A tape movement constraint is provided for a tape drive system which moves a tape longitudinally along a tape path across a tape head, the tape having longitudinal tracks. The tape head has a track following servo system for moving the head laterally for following lateral movement of the tracks, where the tape is subject to lateral transient movement. A tape roller bearing closely adjacent the tape head is rotatable about a central axis parallel to the cylindrical peripheral surface, allowing the tape freedom of movement in the longitudinal direction. The tape roller bearing has a frictional cylindrical peripheral surface for contacting and engaging the surface of the tape and constraining movement of the tape in the lateral direction, thereby reducing the rate of the lateral transient movement of the tape to allow the track following servo system to follow the reduced rate lateral transient movement of the longitudinal tracks. Any potential air bearing that could form between the surface of the tape and the surface of the roller bearing is collapsed to insure that the roller bearing frictionally contacts and engages the surface of the tape.
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Patent Agency Ranking
公开(公告)号：DE2823296A1
公开(公告)日：1978-12-14
申请号：DE2823296
申请日：1978-05-27
Applicant: IBM
Inventor： CHU RICHARD CHAO-SAN , EATON JAMES HOWARD , MEAGHER RALPH ERNEST
IPC: F28F13/00 , H01L23/367 , H01L23/433 , H01L23/473 , H01L25/04 , H01L25/18 , H01L23/36
Abstract: A conduction heat transfer connection is made between a heat source and a heat sink which is flexible so as to adapt to variations in distance between the source and sink and which maintains the required force on the heat source to obtain the required heat transfer across the junction therebetween. The connection consists of a heat conductive metallic foil bundle of sufficient thickness to contact sufficient surface area of the heat source to provide the required heat transfer and of sufficient thinness to be flexible enough to absorb the expansion and contraction due to temperature changes as well as the differences in distance between the heat source and sink and of sufficient length to contact at or near the other end thereof the heat sink.
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公开(公告)号：DE2460913A1
公开(公告)日：1975-08-07
申请号：DE2460913
申请日：1974-12-21
Applicant: IBM
Inventor： EATON JAMES HOWARD
Abstract: A source of energy is selectively applied to a liquid stream to reduce the surface tension of the liquid and is applied before the stream would randomly break up into droplets. Both the quantity of energy applied and the time period that the energy is applied are controlled to control the time to droplet breakoff and the time between droplets by selectively reducing the surface tension of segments of the stream. The source of energy can be high intensity light, which is converted by the stream to heat energy, or a source of heat (resistive or inductive) with the resistive heat being applied to the stream by conduction and the inductive heat being converted by the stream to heat energy.
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8.发明专利
公开(公告)号：IN192102B
公开(公告)日：2004-02-21
申请号：IN684MA1995
申请日：1995-06-07
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BARRETT ROBERT CARL , EATON JAMES HOWARD
IPC: G11B5/00
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公开(公告)号：SG68665A1
公开(公告)日：1999-11-16
申请号：SG1998001069
申请日：1998-05-15
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BARRETT CARL , EATON JAMES HOWARD , HUTCHINS ROBERT ALLEN , JAQUETTE GLEN ALAN
Abstract: Disclosed is a magnetic tape media having addressing data information superimposed on prerecorded track following servo information. The servo information is recorded in magnetic flux transition patterns defining at least one longitudinal servo track. A servo burst pattern of at least two repeated pairs of non-parallel magnetic flux transitions is provided, at least one of which transitions is slanted or otherwise continuously longitudinally variable across the width of the servo track. At least two transitions of the repeated pairs are shifted longitudinally with respect to other of the transitions, the shifted transitions comprising the superimposed addressing data information. Also disclosed is a magnetic tape media having prerecorded combined servo and data information recorded in repeated pairs of magnetic flux dual transitions, at least one of the repeated pairs of dual transitions having a different width with respect to other of the transitions, the different width transitions comprising data information.
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公开(公告)号：CA2064642C
公开(公告)日：1995-09-26
申请号：CA2064642
申请日：1992-04-01
Applicant: IBM
Inventor： EATON JAMES HOWARD , SPONG JAQUELIN KETNER
IPC: G11B23/087 , G11B15/60 , G11B15/665
Abstract: The invention is a constrained pivot compound radius tape post guide. The post is mounted on an axle which allows it to pivot when the tape changes direction. The pivoting action serves to peel away all tape which has been in stationary contact with the post, thereby reducing startup stiction. Above a certain rotation angle the post is prevented from further rotation either by a fixed stop or by torque exerted on the post by the tape which is under tension.
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