Patents by Inventor Mathew Mate

Mathew Mate 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).

  • Method for actively controlling electric potential at the head/disk interface of a magnetic recording disk drive
    Patent number: 7233451
    Abstract: An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: June 19, 2007
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Peter Michael Baumgart, Bernhard Knigge, Mathew Mate
  • Magnetic recording disk drive with actively controlled electric potential at the head/disk interface for wear and durability control
    Patent number: 7016139
    Abstract: An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: March 21, 2006
    Assignee: Hitachi GLobal Storage Netherlands B.V.
    Inventors: Peter Michael Baumgart, Bernhard Knigge, Mathew Mate
  • Magnetic recording disk drive with actively controlled electric potential at the head/disk interface for wear and durability control
    Publication number: 20050088772
    Abstract: An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.
    Type: Application
    Filed: October 22, 2003
    Publication date: April 28, 2005
    Applicant: Hitachi Global Storage Technologies Netherlands B
    Inventors: Peter Baumgart, Bernhard Knigge, Mathew Mate
  • Method for actively controlling electric potential at the head/disk interface of a magnetic recording disk drive
    Publication number: 20050088769
    Abstract: An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.
    Type: Application
    Filed: October 22, 2003
    Publication date: April 28, 2005
    Applicant: Hitachi Global Storage Technologies Netherlands B
    Inventors: Peter Baumgart, Bernhard Knigge, Mathew Mate