Patents by Inventor Kevin Bruce Judd
Kevin Bruce Judd has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11935558Abstract: A method, according to one embodiment, includes cycling a shorter length of a tape, that is less than an entire length of the tape, a plurality of times to acclimate the shorter length of the tape. An acclimation change amount of the shorter length of the tape is determined. The acclimation change amount is based on a baseline servo band difference (SBD) measured before the cycling and a post cycling SBD measured after the cycling. The method further includes adjusting SBD values from a beginning of the tape (BOT) to an end of the tape (EOT) based on the determined acclimation change amount. A system according to another embodiment includes a processor, and logic integrated with the processor, executable by the processor, or integrated with and executable by the processor. The logic is configured to cause the processor to perform operations of the foregoing method.Type: GrantFiled: December 22, 2022Date of Patent: March 19, 2024Assignee: International Business Machines CorporationInventors: Kevin Bruce Judd, Eiji Ogura
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Publication number: 20240060537Abstract: Provided are a tape guide roller and tape drive having a guide roller having magnets and bushings to stabilize a roller barrel for a tape medium. The tape guide roller has a roller barrel extending around a vertical axis. The tape medium passes across the roller barrel to guide the tape medium on a tape path. A plurality of magnets positioned with respect to the vertical axis provide an axial force to stabilize the tape guide roller axially.Type: ApplicationFiled: August 22, 2022Publication date: February 22, 2024Inventors: Kevin Bruce JUDD, Walter HAEBERLE, Simeon FURRER, Mark Alfred LANTZ, Armando ARGUMEDO
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Publication number: 20230129334Abstract: A method, according to one embodiment, includes cycling a shorter length of a tape, that is less than an entire length of the tape, a plurality of times to acclimate the shorter length of the tape. An acclimation change amount of the shorter length of the tape is determined. The acclimation change amount is based on a baseline servo band difference (SBD) measured before the cycling and a post cycling SBD measured after the cycling. The method further includes adjusting SBD values from a beginning of the tape (BOT) to an end of the tape (EOT) based on the determined acclimation change amount. A system according to another embodiment includes a processor, and logic integrated with the processor, executable by the processor, or integrated with and executable by the processor. The logic is configured to cause the processor to perform operations of the foregoing method.Type: ApplicationFiled: December 22, 2022Publication date: April 27, 2023Inventors: Kevin Bruce Judd, Eiji Ogura
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Patent number: 11605400Abstract: A method according to one embodiment includes measuring a baseline servo band difference (SBD) from a beginning of a tape (BOT) to an end of the tape (EOT), and storing values of the baseline SBD measurements in a memory. A shorter length of the tape that is less than an entire length of the tape is cycled a plurality of times to acclimate the shorter length of the tape. A post cycling SBD of the shorter length of the tape is determined and an acclimation change amount of the shorter length of the tape that is a difference between the baseline SBD of the shorter length and the post cycling SBD of the shorter length is determined. The method further includes adjusting the baseline SBD values based on the determined acclimation change amount.Type: GrantFiled: July 20, 2021Date of Patent: March 14, 2023Assignee: International Business Machines CorporationInventors: Kevin Bruce Judd, Eiji Ogura
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Publication number: 20230033482Abstract: A method according to one embodiment includes measuring a baseline servo band difference (SBD) from a beginning of a tape (BOT) to an end of the tape (EOT), and storing values of the baseline SBD measurements in a memory. A shorter length of the tape that is less than an entire length of the tape is cycled a plurality of times to acclimate the shorter length of the tape. A post cycling SBD of the shorter length of the tape is determined and an acclimation change amount of the shorter length of the tape that is a difference between the baseline SBD of the shorter length and the post cycling SBD of the shorter length is determined. The method further includes adjusting the baseline SBD values based on the determined acclimation change amount.Type: ApplicationFiled: July 20, 2021Publication date: February 2, 2023Inventors: Kevin Bruce Judd, Eiji Ogura
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Patent number: 8902531Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.Type: GrantFiled: August 28, 2012Date of Patent: December 2, 2014Assignee: International Business Machines CorporationInventors: Nhan Xuan Bui, Kevin Bruce Judd, Roger Javier Justo, Hirokazu Nakayama, Tomoko Taketomi
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Patent number: 8810956Abstract: A method for accurately adjusting skew in the presence of tape motion includes performing a calibration run of magnetic tape in a tape drive. During the calibration run, the method records skew readings at selected intervals. The method then finds a range associated with the skew readings, such as by finding a high and low skew reading. The method then finds a center point of the range, and a difference between the center point and a desired center point. The method applies the difference to each recorded skew reading to generate a target skew reading for each recorded skew reading. The method generates a skew error signal that reflects the difference between each recorded skew reading and each corresponding target skew reading. The skew error signal will generally be consistent even as the tape moves, thereby allowing a technician to easily adjust and optimize the skew.Type: GrantFiled: July 30, 2012Date of Patent: August 19, 2014Assignee: International Business Machines CorporationInventors: Randy Clark Inch, Kevin Bruce Judd
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Patent number: 8755151Abstract: In one embodiment, a tape movement constraint comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates. An actuator adapted to pivot the roller bearing surface controls the lateral position of a tape. In operation, in one embodiment, the roller barrel of the roller bearing is rotated by engaging a surface of the tape roller barrel with a longitudinally moving magnetic tape. At least a portion of any air bearing between the moving tape and the barrel surface is quenched using grooves formed in the barrel surface. The lateral position of the moving tape is sensed and the rotating roller barrel is tilted in response to the sensed lateral position of the moving tape to control the lateral position of the moving tape. Other embodiments are described and claimed.Type: GrantFiled: May 4, 2012Date of Patent: June 17, 2014Assignee: International Business Machines CorporationInventors: Armando Jesus Argumedo, William Marvin Dyer, Wayne Isami Imaino, Kevin Bruce Judd
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Patent number: 8749922Abstract: A tape movement constraint for a tape drive system, comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates, and an actuator adapted to pivot the roller bearing surface when the actuator is actuated, to control the lateral position of a tape. In operation, in one embodiment, a roller barrel of the tiltable roller bearing is biased in a first position on a pivot axis, using magnetic attraction between a movable magnet and a return path structure of magnetically permeable material. The roller barrel is pivoted on the pivot axis by conducting current through a fixed coil to generate a magnetic field which is conducted by the return path structure to interact with the magnetic field of the magnet. Other embodiments are described and claimed.Type: GrantFiled: July 23, 2012Date of Patent: June 10, 2014Assignee: International Business Machines CorporationInventors: Armando Jesus Argumedo, Nhan Xuan Bui, William Marvin Dyer, Reed Alan Hancock, David Howard Flores Harper, Wayne Isami Imaino, Kevin Bruce Judd
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Patent number: 8743508Abstract: A tape movement constraint for a tape drive system, comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates, and an actuator adapted to pivot the roller bearing surface when the actuator is actuated, to control the lateral position of a tape. In operation, in one embodiment, a roller barrel of the tiltable roller bearing is biased in a first position on a pivot axis, using magnetic attraction between a movable magnet and a return path structure of magnetically permeable material. The roller barrel is pivoted on the pivot axis by conducting current through a fixed coil to generate a magnetic field which is conducted by the return path structure to interact with the magnetic field of the magnet. Other embodiments are described and claimed.Type: GrantFiled: July 23, 2012Date of Patent: June 3, 2014Assignee: International Business Machines CorporationInventors: Armando Jesus Argumedo, Nhan Xuan Bui, William Marvin Dyer, Reed Alan Hancock, David Howard Flores Harper, Wayne Isami Imaino, Kevin Bruce Judd
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Publication number: 20140063649Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.Type: ApplicationFiled: August 28, 2012Publication date: March 6, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Nhan Xuan BUI, Kevin Bruce Judd, Roger Javier Justo, Hirokazu Nakayama, Tomoko Taketomi
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Patent number: 8619392Abstract: In one embodiment, a tape movement constraint comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates. An actuator adapted to pivot the roller bearing surface controls the lateral position of a tape. In operation, in one embodiment, the roller barrel of the roller bearing is rotated by engaging a surface of the tape roller barrel with a longitudinally moving magnetic tape. At least a portion of any air bearing between the moving tape and the barrel surface is quenched using grooves formed in the barrel surface. The lateral position of the moving tape is sensed and the rotating roller barrel is tilted in response to the sensed lateral position of the moving tape to control the lateral position of the moving tape. Other embodiments are described and claimed.Type: GrantFiled: May 4, 2012Date of Patent: December 31, 2013Assignee: International Business Machines CorporationInventors: Armando Jesus Argumedo, William Marvin Dyer, Wayne Isami Imaino, Kevin Bruce Judd
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Publication number: 20130021693Abstract: A tape movement constraint for a tape drive system, comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates, and an actuator adapted to pivot the roller bearing surface when the actuator is actuated, to control the lateral position of a tape. In operation, in one embodiment, a roller barrel of the tiltable roller bearing is biased in a first position on a pivot axis, using magnetic attraction between a movable magnet and a return path structure of magnetically permeable material. The roller barrel is pivoted on the pivot axis by conducting current through a fixed coil to generate a magnetic field which is conducted by the return path structure to interact with the magnetic field of the magnet. Other embodiments are described and claimed.Type: ApplicationFiled: July 23, 2012Publication date: January 24, 2013Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Armando Jesus Argumedo, Nhan Xuan Bui, William Marvin Dyer, Reed Alan Hancock, David Howard Flores Harper, Wayne Isami Imaino, Kevin Bruce Judd
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Publication number: 20130021692Abstract: A tape movement constraint for a tape drive system, comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates, and an actuator adapted to pivot the roller bearing surface when the actuator is actuated, to control the lateral position of a tape. In operation, in one embodiment, a roller barrel of the tiltable roller bearing is biased in a first position on a pivot axis, using magnetic attraction between a movable magnet and a return path structure of magnetically permeable material. The roller barrel is pivoted on the pivot axis by conducting current through a fixed coil to generate a magnetic field which is conducted by the return path structure to interact with the magnetic field of the magnet. Other embodiments are described and claimed.Type: ApplicationFiled: July 23, 2012Publication date: January 24, 2013Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Armando Jesus Argumedo, Nhan Xuan Bui, William Marvin Dyer, Reed Alan Hancock, David Howard Flores Harper, Wayne Isami Imaino, Kevin Bruce Judd
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Publication number: 20120281308Abstract: In one embodiment, a tape movement constraint comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates. An actuator adapted to pivot the roller bearing surface controls the lateral position of a tape. In operation, in one embodiment, the roller barrel of the roller bearing is rotated by engaging a surface of the tape roller barrel with a longitudinally moving magnetic tape. At least a portion of any air bearing between the moving tape and the barrel surface is quenched using grooves formed in the barrel surface. The lateral position of the moving tape is sensed and the rotating roller barrel is tilted in response to the sensed lateral position of the moving tape to control the lateral position of the moving tape. Other embodiments are described and claimed.Type: ApplicationFiled: May 4, 2012Publication date: November 8, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Armando Jesus Argumedo, William Marvin Dyer, Wayne Isami Imaino, Kevin Bruce Judd
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Publication number: 20120281307Abstract: In one embodiment, a tape movement constraint comprises a tiltable tape roller bearing having a grooved surface adapted to contact and engage a surface of the tape as the roller barrel rotates. An actuator adapted to pivot the roller bearing surface controls the lateral position of a tape. In operation, in one embodiment, the roller barrel of the roller bearing is rotated by engaging a surface of the tape roller barrel with a longitudinally moving magnetic tape. At least a portion of any air bearing between the moving tape and the barrel surface is quenched using grooves formed in the barrel surface. The lateral position of the moving tape is sensed and the rotating roller barrel is tilted in response to the sensed lateral position of the moving tape to control the lateral position of the moving tape. Other embodiments are described and claimed.Type: ApplicationFiled: May 4, 2012Publication date: November 8, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Armando Jesus Argumedo, William Marvin Dyer, Wayne Isami Imaino, Kevin Bruce Judd
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Patent number: 8270114Abstract: In one embodiment, a tape movement constraint for a tape drive system, comprises a tiltable tape roller bearing having a roller barrel biased in a first position on a pivot axis, using magnetic attraction between a movable magnet and a return path structure of magnetically permeable material. The roller barrel is pivoted on the pivot axis by conducting current through a fixed coil to generate a magnetic field which is conducted by the return path structure to interact with the magnetic field of the magnet. At least a portion of any air bearing between the moving tape and the barrel surface is quenched using grooves formed in the barrel surface. Other embodiments are described and claimed.Type: GrantFiled: February 8, 2008Date of Patent: September 18, 2012Assignee: International Business Machines CorporationInventors: Armando Jesus Argumedo, Nhan Xuan Bui, William Marvin Dyer, Reed Alan Hancock, David Howard Flores Harper, Wayne Isami Imaino, Kevin Bruce Judd
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Patent number: 8228635Abstract: In one embodiment, a tape movement constraint for a tape drive system, comprises a tiltable tape roller bearing and an actuator adapted to pivot the roller bearing surface when the actuator is actuated, to control the lateral position of a tape. In operation, in one embodiment, the roller barrel of the roller bearing is rotated by engaging a surface of the tape roller barrel with a longitudinally moving magnetic tape. At least a portion of any air bearing between the moving tape and the barrel surface is quenched using grooves formed in the barrel surface. The lateral position of the moving tape is sensed and the rotating roller barrel is tilted in response to the sensed lateral position of the moving tape to control the lateral position of the moving tape. Other embodiments are described and claimed.Type: GrantFiled: February 8, 2008Date of Patent: July 24, 2012Assignee: International Business Machines CorporationInventors: Armando Jesus Argumedo, William Marvin Dyer, Wayne Isami Imaino, Kevin Bruce Judd
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Patent number: 8059362Abstract: Where a tape is subject to lateral shift excursions from one side of a head to another, a coarse actuator is positioned laterally to enable a fine actuator to follow lateral motion of a longitudinal tape having at least one longitudinal defined servo track. A position error signal loop is configured to sense servo sensor(s) and to determine position error between the head and a desired position related to the defined servo track(s). A servo control senses the lateral shift excursion of the defined servo track(s); determines a maximum positive peak and a maximum negative peak of the lateral shift excursion; and positions the coarse actuator substantially at a midpoint of the maximum positive peak and the maximum negative peak of lateral shift excursion of the defined servo track(s). Thus, the fine actuator follows the lateral shift excursion, while the coarse actuator remains at the midpoint.Type: GrantFiled: March 2, 2010Date of Patent: November 15, 2011Assignee: International Business Machines CorporationInventors: Reed Alan Hancock, Randy Clark Inch, Kevin Bruce Judd, Kazuhiro Tsuruta
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Patent number: 8054576Abstract: A servo detection system for detecting servo tracks of a longitudinal tape. In a read/write head, two servo read heads are spaced laterally on a first head module, and a servo read head is on a second head module spaced longitudinally from the first module. A method comprises initially sensing a tape servo track with one servo read head of the first module and the servo read head of the second module to determine skew misalignment of the servo track. A zero reference value is stored representing the determined skew misalignment. The detection system switches from the one servo read head of each module, to the two servo read heads of the first module, and employs the stored value to position the read/write head in the zero skew position. The two servo read heads are then employed to read two servo tracks to identify the data band and to control skew.Type: GrantFiled: February 17, 2010Date of Patent: November 8, 2011Assignee: International Business Machines CorporationInventors: Nhan Xuan Bui, Reed Alan Hancock, Randy Clark Inch, Kevin Bruce Judd, Kazuhiro Tsuruta