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公开(公告)号：CA2148390C
公开(公告)日：2004-04-27
申请号：CA2148390
申请日：1995-05-02
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BARRETT ROBERT CARL , EATON JAMES HOWARD
Abstract: A track following servo system is disclosed for use with magnetic tape syste ms in which magnetic servo track patterns contain transitions recorded at more than on 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 i s read by a servo read head whose width is small compared to the servo track patter n. 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, t he servo read head is also narrow with respect to the data tracks, which provid es 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 on the tape, wear of the head or tape, or debris collection on the head or tape. Position sensing with this system is achieved by deriving a ratio of two ser vo pattern intervals and therefore is insensitive to tape speed during reading. The ser vo patterns may include spacing intervals recognizable for error detection and correction purposes. Servo tracks are recorded using a patterned multiple ga p servo write head whosemagnetic gaps have geometries appropriate to generate the desired servo patterns. The patterned gaps of the servo write head are produced by photolithographically defined electroplating of permalloy on a ferrite ri ng head structure.
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公开(公告)号：AU2003202708A1
公开(公告)日：2003-09-04
申请号：AU2003202708
申请日：2003-02-03
Applicant: IBM
Inventor： EATON JAMES HOWARD , IMAINO WAYNE ISAMI , PAN TZONG-SHII
Abstract: A servo writer generates a linear servo track timing based servo pattern comprised of transitions that extend laterally of the track. At least three spaced apart write elements, two of parallel azimuthal orientation, and at least one of a different azimuthal orientation, write patterns corresponding to the write elements, fixing both the distance between transitions having different azimuthal orientation, the "A" distance, and the distance between transitions having parallel azimuthal orientation, the "B" distance. The fixed distances provide precise sensing of lateral position based on a measure of time over the "A" distance compared to time over the "B" distance.
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公开(公告)号：DE69507210D1
公开(公告)日：1999-02-25
申请号：DE69507210
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：SG33347A1
公开(公告)日：1996-10-18
申请号：SG1995000276
申请日：1995-04-18
Applicant: IBM
Inventor： EATON JAMES HOWARD , BARRETT ROBERT CARL , ALBRECHT THOMAS ROBERT
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：AT326047T
公开(公告)日：2006-06-15
申请号：AT03701619
申请日：2003-02-03
Applicant: IBM
Inventor： EATON JAMES HOWARD , IMAINO WAYNE ISAMI , PAN TZONG-SHII
Abstract: A servo writer generates a linear servo track timing based servo pattern comprised of transitions that extend laterally of the track. At least three spaced apart write elements, two of parallel azimuthal orientation, and at least one of a different azimuthal orientation, write patterns corresponding to the write elements, fixing both the distance between transitions having different azimuthal orientation, the "A" distance, and the distance between transitions having parallel azimuthal orientation, the "B" distance. The fixed distances provide precise sensing of lateral position based on a measure of time over the "A" distance compared to time over the "B" distance.
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Patent Agency Ranking
公开(公告)号：DE69507210T2
公开(公告)日：1999-09-02
申请号：DE69507210
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：DE69224558D1
公开(公告)日：1998-04-09
申请号：DE69224558
申请日：1992-06-12
Applicant: IBM
Inventor： EATON JAMES HOWARD , SPONG JACQUELIN KETNER
IPC: G11B15/60 , G11B23/087 , G11B15/665
Abstract: A magnetic tape drive 20 includes a tape path 21 having first and second reels 22 and 23 for a tape 1, a transducer head 24 and guides 10a, 10b and 10c for the tape. The guides 10a, 10b and 10c are pivotally mounted on axles 15a, 15b and 15c and the operation of the drive is controlled by a controller 25. Fach of the guides is a constrained pivot compound radius tape post. 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 pivotation angle the post is prevented from further pivotation either by a fixed stop or by torque exerted on the post by the tape which is under tension.
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公开(公告)号：CA2097227C
公开(公告)日：1996-10-29
申请号：CA2097227
申请日：1993-05-28
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , ARGUMEDO ARMANDO JESUS , EATON JAMES HOWARD , EAST DON GAYLORD , FELDE STEVEN LLOYD , JOHNSON DOUGLAS WAYNE
IPC: G11B23/037 , G11B23/08 , G11B23/087 , G11B33/14
Abstract: The invention is a tape reel brake which is mounted in a well in the top of a tape reel hub. The well is inside the tape bearing surface of the hub. The brake is mounted to be compliantly biased away from the base of the well. The hub is seated against a first inside surface of a tape cartridge housing. The hub and brake are seated in the tape cartridge such that teeth on the periphery of the brake are biased against the opposite inside surface of the cartridge housing about the periphery of an opening therein. The biasing of the brake against the opposite inside surface both prevents the rotation of the reel and shields out dust when the tape cartridge is removed from a tape drive. To rotate the reel, a tape drive clutch enters the opening in the opposite inside surface and depresses the brake into the well to mate with a smaller diameter portion of the hub or a recessed portion of the brake. The hub is always maintained on the inside surface of the housing, thereby eliminating lateral motion which could disrupt the tape path.
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公开(公告)号：DE69117467D1
公开(公告)日：1996-04-04
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：CA2148390A1
公开(公告)日：1995-12-31
申请号：CA2148390
申请日：1995-05-02
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BARRETT ROBERT CARL , EATON JAMES HOWARD
Abstract: A track following servo system is disclosed for use with magnetic tape systems in which magnetic servo track patterns contain transitions recorded at more than on 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 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 on the tape, wear of the head or tape, or debris collection on the head or tape.Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to tape speed during reading. The servo patterns may include spacing intervals recognizable for error detection and correction purposes. Servo tracks are recorded using a patterned multiple gap servo write head whose magnetic gaps have geometries appropriate to generate thedesired servo patterns. The patterned gaps of the servo write head are produced by photolithographically defined electroplating of permalloy on a ferrite ring head structure.
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