Patents by Inventor Jack Ming Teng
Jack Ming Teng 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: 6757127Abstract: An information handling system, such as a disc drive, includes a base, a disc stack rotatably attached to the base, and an actuator assembly movably attached to the base. A region of the disc stack is identified as a parking band, and when power is not provided to the disc drive, the actuator assembly is held in a parked position within the parking band by an actuator latch. The actuator latch and actuator assembly have different resonant frequencies based on several environmental elements near the actuator assembly, including the temperature of the environment in the disc enclosure. The actuator assembly is unlatched by measuring the environmental element near the actuator assembly and applying an alternating current to a voice coil coupled to the actuator. The frequency of the alternating current applied to the actuator assembly during the unlatching procedure is near the resonant frequency of the actuator assembly in the measured environment.Type: GrantFiled: August 25, 2000Date of Patent: June 29, 2004Assignee: Seagate Technology LLCInventors: Jack Ming Teng, Kian Keong Ooi, Ming Zhong Ding, Wing Kong Chiang, Louis Seng Hong Pang, Beng Wee Quak
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Patent number: 6704159Abstract: A method of implementing an automatic acoustic management feature for a disc drive includes receiving an acoustic/performance compromising factor from a host, tuning disc drive performance by applying the factor to a control parameter to generate a modified control parameter, and executing a loop for controlling a disc drive operation using the modified control parameter. In another embodiment, a disc drive has a base, a rotatable disc, an actuator assembly with an arm for carrying a head in transducing relation to the disc in response to a control signal, a receiver for receiving an acoustic/performance compromising factor, and a controller that monitors the position of the arm and generates the control signal. The controller executes a seeking control loop having a control parameter modified by applying a compromising factor to the parameter to tune the acoustic performance of the drive.Type: GrantFiled: March 16, 2001Date of Patent: March 9, 2004Assignee: Seagate Technology LLCInventors: MingZhong Ding, KianKeong Ooi, YangQuan Chen, Jack Ming Teng, ShuangQuan Min, Beng Wee Quak
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Patent number: 6690532Abstract: A method and apparatus for detecting and recovering from head instability in a magneto-resistive (MR) transducer head of a disc-drive system. A head-instability-recovery circuit is described for use in disc drive to recover from a head-instability condition of an MR transducer head. This circuit includes a controller and a current source that supplies current to the MR head. The current source is controlled to supply a nominal amount of current to the MR head when operating in a normal mode, and to supply one or more current bursts having a current above the nominal supply current in order to recover from the head-instability condition. Also described is a method for recovering from a transducer-instability condition of an MR transducer of a disc drive, including detecting a situation that indicates a head-instability-recovery operation is desired, and performing the head-instability-recovery operation.Type: GrantFiled: March 31, 2000Date of Patent: February 10, 2004Assignee: Seagate Technology LLCInventors: Swee Kieong Choo, Jack Ming Teng, Hwee Peng Teo, Myint Ngwe, Beng Wee Quak, Kwee Teck Say
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Patent number: 6674604Abstract: An information handling system, such as a disc drive, includes a base, a disc stack rotatably attached to the base, and an actuator assembly movably attached to the base. A region of the disc stack is identified as a parking band, and when power is not provided to the disc drive, the actuator assembly is held in a parked position within the parking band by a magnetic latch. The magnetic latch is overcome during a powerup process by a voice coil motor coupled to the actuator. Other regions of the disc stack are associated with various functions performed by the voice coil motor as the actuator passes over such regions.Type: GrantFiled: March 31, 2000Date of Patent: January 6, 2004Assignee: Seagate Technology LLCInventors: Jack Ming Teng, Kok Hiang Cheong, MingZhong Ding, KianKeong Ooi
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Patent number: 6606213Abstract: A disc drive system and method of screening an actuator resonance includes a servo controller providing a multi-servo zone architecture. The servo controller partitions the disc into a plurality of servo zones. Each of the servo zones has a corresponding servo gain. When an actuator resonance is detected in one of the servo zones, the servo controller reduces the corresponding servo gain of the detected servo zone such that a drive with very low resonance at a certain zone does not affect the servo bandwidth of the other good zones. Accordingly, a drive with very low resonance is prevented from being scrapped. Further, the screening technique allows a drive to have an adequate servo margin for its normal operation after going through a resonance detection test.Type: GrantFiled: June 11, 1999Date of Patent: August 12, 2003Assignee: Seagate Technology LLCInventors: Kian Keong Ooi, Jack Ming Teng, Soon Wah Leow, Ming Zhong Ding
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Patent number: 6597528Abstract: A disc drive includes a base and a disc rotatably attached to the base. The disc drive also includes an actuator assembly rotatably attached to said base and a device for moving the actuator assembly. The actuator assembly includes a transducer head in a transducing relationship with respect to the disc. The disc drive includes a disc drive controller for controlling movement of the actuator during track follow and track seek operations. The disc drive controller monitors the actuator during seek operations. The disc drive controller further computes a maximum average settle time from the monitored settle times. The dis drive controller further compares the maximum average settle time to a predetermined threshold value, and issues a command signal to adjust seek profile parameters of the disc drive to eliminate resonance in the actuator arm during a seek operation.Type: GrantFiled: April 25, 2000Date of Patent: July 22, 2003Assignee: Seagate Technology LLCInventors: Louis Seng Hong Pang, Kian Keong Ooi, Jack Ming Teng, Ming Zhong Ding
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Publication number: 20020006010Abstract: A method of implementing an automatic acoustic management feature for a disc drive includes receiving an acoustic/performance compromising factor from a host, tuning disc drive performance by applying the factor to a control parameter to generate a modified control parameter, and executing a loop for controlling a disc drive operation using the modified control parameter. In another embodiment, a disc drive has a base, a rotatable disc, an actuator assembly with an arm for carrying a head in transducing relation to the disc in response to a control signal, a receiver for receiving an acoustic/performance compromising factor, and a controller that monitors the position of the arm and generates the control signal. The controller executes a seeking control loop having a control parameter modified by applying a compromising factor to the parameter to tune the acoustic performance of the drive.Type: ApplicationFiled: March 16, 2001Publication date: January 17, 2002Inventors: MingZhong Ding, KianKeong Ooi, Yang Quan Chen, Jack Ming Teng, Shuang Quan Min, Beng Wee Quak
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Patent number: 6252364Abstract: A method and apparatus for releasing an actuator from a latched position. A voice coil motor is operably coupled to the actuator which is held by a latch in a latched position. The voice coil motor is provided with a first current signal of increasing magnitude alternating with a second current signal out of phase with the first current signal. The first current signal causes the voice coil motor to urge the actuator away from the latched position, and the second current signal causes the voice coil motor to urge the actuator towards the latched position.Type: GrantFiled: September 22, 1999Date of Patent: June 26, 2001Assignee: Seagate Technology LLCInventors: Wing Kong Chiang, Kian Keong Ooi, Ricky Wei Watt Yeo, Jack Ming Teng, Choon Kiat Lim
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Patent number: 5710677Abstract: A method to accurately determine a defective servo burst written on a recording medium having plurality of tracks, each track containing plurality of position data portions. The position data portions include servo bursts capable of providing position error information, which can be selectively retrieved by a servo control system having a servo gate enabling signal. A first likely defective servo burst is identified by reading each servo burst, measuring corresponding position error information and comparing to a range of acceptable position error information. While disabling retrieval from the first likely defective servo burst, the position error information of plurality of servo bursts occurring after the first likely defective servo burst is measured. If the measured values are within the acceptable range, the first likely defective servo burst is concluded as the first confirmed defective servo burst.Type: GrantFiled: December 18, 1995Date of Patent: January 20, 1998Assignee: Seagate Technology, Inc.Inventors: Jack Ming Teng, Peng Yeong Loh