Patents by Inventor Charles Leon McHenry

Charles Leon McHenry 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).

  • Dual stage positioning system using a shared voltage source
    Patent number: 6541931
    Abstract: A system for positioning a read/write head having a voice coil suitable for coarse control and a piezoelectric transducer (PZT) suitable for fine control. A voice coil control signal and a PZT control signal are generated from a position-indicative signal, both receiving power via a shared supply having a nominal rectified voltage V1. In a preferred method, control signals are both applied to the voice coil and PZT when amplified so that each has a saturation voltage smaller than |V1|.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: April 1, 2003
    Assignee: Seagate Technology LLC
    Inventors: Hai Thanh Ho, Margot A. LaPanse, Charles Leon McHenry, Jianbo He
  • Dual stage positioning system using a shared voltage source
    Publication number: 20020057068
    Abstract: A system for positioning a read/write head having a voice coil suitable for coarse control and a piezoelectric transducer (PZT) suitable for fine control. A voice coil control signal and a PZT control signal are generated from a position-indicative signal, both receiving power via a shared supply having a nominal rectified voltage V1. In a preferred method, control signals are both applied to the voice coil and PZT when amplified so that each has a saturation voltage smaller than |V1|.
    Type: Application
    Filed: May 15, 2001
    Publication date: May 16, 2002
    Inventors: Hai Thanh Ho, Margot A. LaPanse, Charles Leon McHenry, Jianbo He