Patents by Inventor Majeed Abed

Majeed Abed 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).

  • Disk drive head position controller with static bias compensation and plural velocity detectors
    Patent number: 4949201
    Abstract: A positioning system for a hard disk drive for rapidly and accurately positioning the disk head. A constant bias compensation signal is injected into the feedback loop to reduce positioning delays otherwise caused by a steady state force which is asserted against the head. High and low velocity measuring techniques are also disclosed, along with several techniques for advantageously injecting these measurements into the feedback loop at appropriate times. An improved resonant filter is also disclosed.
    Type: Grant
    Filed: April 1, 1988
    Date of Patent: August 14, 1990
    Assignee: Micropolis Corporation
    Inventor: Majeed Abed
  • Runout compensation for a coarse tracking servo system in an optical disk storage unit
    Patent number: 4755977
    Abstract: An optical disk storage unit has an access and tracking system with a microprocessor which stores a runout signal representing the eccentricity of the tracks and bands as a function of the rotation of the disk surface. The runout signal is summed with the output of the access and tracking system to compensate for eccentricity as the disk rotates.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: July 5, 1988
    Assignee: Storage Technology Partners II
    Inventor: Majeed Abed
  • Focus acquisition and maintenance for optical disk system
    Patent number: 4677605
    Abstract: Apparatus and methods are disclosed for acquiring and maintaining focus of a coherent light source used to read and write data in an optical disk data storage device. The system uses a conventional astigmatic focus system in conjunction with a signal processor to detect proximity of focus. After proximity of focus is detected, the signal processor enables a fine focus servo system to maintain focus of the coherent light on the disk surface.
    Type: Grant
    Filed: July 6, 1984
    Date of Patent: June 30, 1987
    Assignee: Storage Technology Partners II
    Inventor: Majeed Abed
  • Optical disk storage unit having a servo system with different velocity inputs
    Patent number: 4627038
    Abstract: An optical disk storage unit has an improved access and tracking system in which a low speed velocity signal is derived from a differentiated position error signal. The output of the differentiator is applied to a blanking circuit which disconnects the steep slope portion of the position error signal from a sample and hold circuit. A medium speed velocity signal is derived from the integral of motor current and a high speed velocity signal is derived by digitally counting the band crossings in the position error signal.
    Type: Grant
    Filed: July 5, 1984
    Date of Patent: December 2, 1986
    Assignee: Storage Technology Partners II
    Inventors: Majeed Abed, Robert P. McIntosh