Patents by Inventor Maureen A. Stengler

Maureen A. Stengler 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).

  • Decoupling technique for optical disk drive optical pickup units
    Patent number: 8462597
    Abstract: A low-cost technique to improve the performance of optical disk drives is presented. An algorithm is used to decouple electro-mechanical actuators thus compensating for inaccuracies in the control of the actuators. A similar method can be used to decouple the position sensors. Prior art methods treated cross-coupling between focus, tracking and sled control loops as noise and therefore increased the bandwidth of the system, also increasing the cost of the optical disk drive. The present disclosure actively decouples the control loops using a software algorithm to provide better performing optical disk drives. The cross-coupling effects are measured, a decoupling matrix is determined, and the output of the control laws is modified so as to decouple the actuators.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: June 11, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: David A. Hayner, Maureen A. Stengler
  • Decoupling technique for optical disk drive optical pickup units
    Publication number: 20040257947
    Abstract: A low-cost technique to improve the performance of optical disk drives is presented. An algorithm is used to decouple electro-mechanical actuators thus compensating for inaccuracies in the control of the actuators. A similar method can be used to decouple the position sensors. Prior art methods treated cross-coupling between focus, tracking and sled control loops as noise and therefore increased the bandwidth of the system, also increasing the cost of the optical disk drive. The present disclosure actively decouples the control loops using a software algorithm to provide better performing optical disk drives. The cross-coupling effects are measured, a decoupling matrix is determined, and the output of the control laws is modified so as to decouple the actuators.
    Type: Application
    Filed: June 20, 2003
    Publication date: December 23, 2004
    Applicant: Motorola, Inc.
    Inventors: David A. Hayner, Maureen A. Stengler