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1.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：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：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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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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Patent Agency Ranking
公开(公告)号：BR9504034A
公开(公告)日：1996-09-24
申请号：BR9504034
申请日：1995-09-15
Applicant: IBM
Inventor： BARRETT ROBERT CARL , OLYHA ROBERT STEPHEN JR , RUTLEDGE JOSEPH DELA
Abstract: A user interface apparatus and method for a computing or processing system employing a graphical user interface is presented. In order to provide a good user feel, and specifically to avoid a feeling of inertia or sluggishness in cursor motion as the user starts or stops movement, the apparatus and method provide a negative inertia transfer function. That is, the cursor movement signal produced by applying the input parameter to a transfer function in accordance with the invention is related to a sum of (i) the input parameter, and (ii) a signal related to the rate of change of the input parameter. This is preferably implemented as an additive high-pass transfer function. Preferred embodiments can employ analog circuitry or a digitally programmed transfer function algorithm. The input parameter to which the transfer function is applied can be a magnitude signal, such as that from a polar coordinate system, or separate components, such as x- and y-components from a rectangular coordinate system, can be treated separately.
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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：CA2317819A1
公开(公告)日：2001-04-28
申请号：CA2317819
申请日：2000-09-07
Applicant: IBM
Inventor： DUTTA RABINDRANATH , LITA CHRISTIAN , RUTKOWSKI MATTHEW FRANCIS , STERLING MERLE DOUGLAS , BELLWOOD THOMAS ALEXANDER , BARRETT ROBERT CARL
Abstract: A set of program elements (e.g., transcoders) are grouped together as an administrative unit. Instead of caching the individual outputs of each program element, preferabl y only the aggregate output of the set of program elements, taken as a whole, is cached. The inventive technique enables the effective re-use of intermediate content. In an illustrative client-server based implementation involving a transcoding service located at a server, the cach ed information may be shared across multiple server instances to obviate redundant processing. With the present invention, a caching mechanism in a complex software system may be extended in a user-configurable manner by setting up optimal intermediate caching points that are defined by groups of programs used in long computations.
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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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