Patents by Inventor Donald Fasen
Donald Fasen 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: 8611039Abstract: There is described apparatus (800) to decode longitudinal position (LPOS) information from non-shifted servo elements (a1, a4, a7) and an unbroken sequence of plural shifted servo elements (a2-a3, a5-a6), variations in the relative displacement of the non-shifted and shifted elements encoding the LPOS information. The apparatus is operable to receive signals (905) from a transducer head apparatus (131) that detects the servo elements as they move past the transducer head apparatus, and to process the signals to obtain data (L1, L4, L5, L8) related to relative displacement of mutually adjacent shifted and non-shifted elements within respective ones of the servo bursts, and data (L2, L3, L6, L7) related to relative displacement of mutually non-adjacent shifted and non-shifted elements within the respective ones of the servo bursts, and also to process the data to determine LPOS bit values corresponding to the respective ones of the servo bursts.Type: GrantFiled: April 29, 2009Date of Patent: December 17, 2013Assignee: Hewlett-Packard Development Company, L.P.Inventor: Donald Fasen
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Patent number: 8432640Abstract: A tape drive comprising a head configured to read data from a tape and to write data to the tape, a pair of flanged guide rollers arranged one on either side of the head to guide the tape longitudinally over the head, and a flangeless inertial roller arranged between a flanged guide roller and the head to add inertia to the tape so as to limit speed and movement of the tape as it passes over the head.Type: GrantFiled: December 15, 2010Date of Patent: April 30, 2013Assignee: Hewlett-Packard Development Company, L.P.Inventors: Donald Fasen, Robert C. Aaron
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Publication number: 20120154950Abstract: A tape drive comprising a head configured to read data from a tape and to write data to the tape, a pair of flanged guide rollers arranged one on either side of the head to guide the tape longitudinally over the head, and a flangeless inertial roller arranged between a flanged guide roller and the head to add inertia to the tape so as to limit speed and movement of the tape as it passes over the head.Type: ApplicationFiled: December 15, 2010Publication date: June 21, 2012Inventors: Donald Fasen, Robert C. Aaron
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Publication number: 20120019948Abstract: There is described apparatus (800) to decode longitudinal position (LPOS) information from non-shifted servo elements (a1, a4, a7) and an unbroken sequence of plural shifted servo elements (a2-a3, a5-a6), variations in the relative displacement of the non-shifted and shifted elements encoding the LPOS information. The apparatus is operable to receive signals (905) from a transducer head apparatus (131) that detects the servo elements as they move past the transducer head apparatus, and to process the signals to obtain data (L1, L4, L5, L8) related to relative displacement of mutually adjacent shifted and non-shifted elements within respective ones of the servo bursts, and data (L2, L3, L6, L7) related to relative displacement of mutually non-adjacent shifted and non-shifted elements within the respective ones of the servo bursts, and also to process the data to determine LPOS bit values corresponding to the respective ones of the servo bursts.Type: ApplicationFiled: April 29, 2009Publication date: January 26, 2012Inventor: Donald Fasen
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Patent number: 8059361Abstract: In one embodiment a tape drive system comprises a reel adapted to engage a tape cartridge, the tape cartridge comprising a tape media having a servo code written along a length of the tape media, a tape head comprising at least one servo element to detect the servo code, a drive assembly to induce relative motion between the tape and the tape drive, a servo system to control the lateral and longitudinal motion between the tape and the tape head, the servo system comprising a sampling module to sample servo data from the tape media, and a position signal processor to calculate a position signal using the servo data from the sampling module, wherein the position signal processor calculates a position signal based on each adjacent servo element set.Type: GrantFiled: January 12, 2009Date of Patent: November 15, 2011Assignee: Hewlett-Packard Development Company, L.P.Inventor: Donald Fasen
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Patent number: 8054575Abstract: In one embodiment a tape drive system comprises a reel adapted to engage a tape cartridge, the tape cartridge comprising a tape media having a servo code written along a length of the tape media, a tape head comprising at least one servo element to detect the servo code, a drive assembly to induce relative motion between the tape and the tape drive, a servo system to control the lateral and longitudinal motion between the tape and the tape head, the servo system comprising a sampling circuit assembly to sample servo data from the tape media, wherein the sampling circuit assembly samples both positive readback waveforms and negative readback waveforms generated by servo code on the tape, a pulse time demodulator circuit module to generate timestamped, digital signals from signals generated by the sampling circuit assembly, and a position signal processor to calculate a position signal using the servo data from the pulse time demodulator circuit module.Type: GrantFiled: January 12, 2009Date of Patent: November 8, 2011Assignee: Hewlett-Packard Development Company, L.P.Inventor: Donald Fasen
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Publication number: 20100177433Abstract: In one embodiment a tape drive system comprises a reel adapted to engage a tape cartridge, the tape cartridge comprising a tape media having a servo code written along a length of the tape media, a tape head comprising at least one servo element to detect the servo code, a drive assembly to induce relative motion between the tape and the tape drive, a servo system to control the lateral and longitudinal motion between the tape and the tape head, the servo system comprising a sampling circuit assembly to sample servo data from the tape media, wherein the sampling circuit assembly samples both positive readback waveforms and negative readback waveforms generated by servo code on the tape, a pulse time demodulator circuit module to generate timestamped, digital signals from signals generated by the sampling circuit assembly, and a position signal processor to calculate a position signal using the servo data from the pulse time demodulator circuit module.Type: ApplicationFiled: January 12, 2009Publication date: July 15, 2010Inventor: Donald Fasen
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Publication number: 20100177434Abstract: In one embodiment a tape drive system comprises a reel adapted to engage a tape cartridge, the tape cartridge comprising a tape media having a servo code written along a length of the tape media, a tape head comprising at least one servo element to detect the servo code, a drive assembly to induce relative motion between the tape and the tape drive, a servo system to control the lateral and longitudinal motion between the tape and the tape head, the servo system comprising a sampling module to sample servo data from the tape media, and a position signal processor to calculate a position signal using the servo data from the sampling module, wherein the position signal processor calculates a position signal based on each adjacent servo element set.Type: ApplicationFiled: January 12, 2009Publication date: July 15, 2010Inventor: Donald Fasen
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Patent number: 7697230Abstract: In one embodiment a tape drive system comprises a reel adapted to engage a tape cartridge, the tape cartridge comprising a tape media having a servo code written along a length of the tape media, a tape head comprising at least one servo element to detect the servo code, a drive assembly to induce relative motion between the tape and the tape drive, a servo system to control a rate of relative motion between the tape and the tape drive, wherein the servo system comprises a sampling module to sample servo code from the tape media and the sampling module implements a dithered sampling routine centered around a design sampling frequency.Type: GrantFiled: July 17, 2007Date of Patent: April 13, 2010Assignee: Hewlett-Packard Development Company, L.P.Inventor: Donald Fasen
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Publication number: 20090021855Abstract: In one embodiment a tape drive system comprises a reel adapted to engage a tape cartridge, the tape cartridge comprising a tape media having a servo code written along a length of the tape media, a tape head comprising at least one servo element to detect the servo code, a drive assembly to induce relative motion between the tape and the tape drive, a servo system to control a rate of relative motion between the tape and the tape drive, wherein the servo system comprises a sampling module to sample servo code from the tape media and the sampling module implements a dithered sampling routine centered around a design sampling frequency.Type: ApplicationFiled: July 17, 2007Publication date: January 22, 2009Inventor: Donald Fasen
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Patent number: 7295506Abstract: A nano-scale tip for use on a probe includes a first width and a second width. The first width of the tip is greater than the second width and the varying sized widths form a substantially elliptical shape.Type: GrantFiled: August 9, 2004Date of Patent: November 13, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: Donald Fasen, Richard L. Hilton
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Publication number: 20070230033Abstract: An apparatus includes plural spaced apart sensors arranged along a direction of motion of a medium, and a processing circuit to receive signals from the sensors, determine a difference of the signals, and identify an error built into the medium based on the difference.Type: ApplicationFiled: April 3, 2006Publication date: October 4, 2007Inventors: Jeffrey McAllister, Donald Fasen, Vernon Knowles
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Publication number: 20070076171Abstract: A wobulator position sensing system includes a wobulator plate, having a wobulator window, and a position detector, associated with the wobulator plate. The wobulator is disposed along an image projection path, and configured to selectively tilt so as to shift the projection path. The position detector is configured to sense a magnitude of tilting of the wobulator plate, and to produce a feedback signal useable to control tilting of the wobulator plate.Type: ApplicationFiled: September 20, 2005Publication date: April 5, 2007Inventors: Donald Fasen, Anurag Gupta, Michael Long, Matthew Smith, Christopher Neel, Douglas Pederson
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Publication number: 20070052695Abstract: A system for displaying an image using a first sub-frame and a second sub-frame is provided. The system comprises an image shifter configured to cause the first sub-frame to be displayed at a first position on a display surface and the second sub-frame to be displayed at a second position on the display surface, a sensor configured to detect a movement of the image shifter, and a controller configured to receive movement information associated with the movement of the image shifter from the sensor.Type: ApplicationFiled: September 7, 2005Publication date: March 8, 2007Inventors: Ted Barnes, Donald Fasen, Matthew Beasley, Arnold Larson, P. Howard, Stan Leigh
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Patent number: 7171512Abstract: A highly parallel data storage chip device providing a plurality of parallel data tracks allocated into separate physical groups upon a data storage medium. A controller establishes logical groups of data tracks located in different physical groups. A servo track provides tracking information for a plurality of read/write devices that move relative to the length of each data track, thereby permitting parallel data transfer between the read/write devices and the distributed data tracks of the logical group.Type: GrantFiled: May 17, 2004Date of Patent: January 30, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: Tracy Sauerwein, John Craig Raese, Richard Hilton, Donald Fasen
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Publication number: 20060274629Abstract: A data storage device includes a first read mechanism, a second read mechanism, and a data storage medium movable with respect to the first read mechanism and the second read mechanism. A first reference patch containing reference bits is positioned near a first corner of the data storage medium. The first read mechanism is configured to read the reference bits of the first reference patch and the second read mechanism is configured to read the reference bits of a second reference patch. The storage device also includes a controller configured to determine whether the first read mechanism and the data storage medium are offset with respect to each other based upon the reference bits read by the first read mechanism and the reference bits read by the second mechanism.Type: ApplicationFiled: June 7, 2005Publication date: December 7, 2006Inventors: Curt Lydegraf, Donald Fasen, Richard Hilton
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Publication number: 20060174168Abstract: A parallel data storage device includes a data storage medium having a first cluster and a second cluster. The first cluster includes a first patch and the second cluster includes a second patch. The parallel data storage device also includes a first reader for reading the first patch of the first cluster and a second reader for reading the second patch of the second cluster. A first multiplexer is used for addressing the first cluster while a second multiplexer is used for addressing the second cluster. The first and second readers are arranged in a single column such that the first reader is electrically connected to the first multiplexer and the second reader is electrically connected to the second multiplexer.Type: ApplicationFiled: January 31, 2005Publication date: August 3, 2006Inventors: Curt Van Lydegraf, Tracy Sauerwein, Donald Fasen, Richard Hilton, Craig Raese, Michael Allyn, Charles Smith
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Publication number: 20060140655Abstract: An image forming method includes measuring an electrical potential on a surface of a developer roller and adjusting a time varying component of a voltage applied to the developer roller using a measurement of the electrical potential.Type: ApplicationFiled: December 26, 2004Publication date: June 29, 2006Inventor: Donald Fasen
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Publication number: 20060131988Abstract: A method and system of calibrating a drive includes changing an electrode voltage between a first set of electrodes and a second set of electrodes in the drive divided by an electrode gap, determining a threshold voltage for the electrode voltage at which an electrostatic attractive force causes the first set of electrodes to be drawn to the second set of electrodes and calculating an operational electrode voltage between the first set of electrodes and the second set of electrodes using the threshold voltage that allows the drive to operate while one or more external accelerations are acting upon the drive.Type: ApplicationFiled: December 16, 2004Publication date: June 22, 2006Inventor: Donald Fasen
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Publication number: 20060028965Abstract: A nano-scale tip for use on a probe includes a first width and a second width. The first width of the tip is greater than the second width and the varying sized widths form a substantially elliptical shape.Type: ApplicationFiled: August 9, 2004Publication date: February 9, 2006Inventors: Donald Fasen, Richard Hilton