Patents by Inventor Yao-Chou Tsai

Yao-Chou Tsai 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 track seeking of a reading head in an optic disk drive
    Patent number: 6636466
    Abstract: A method for track seeking of a reading head in an optic disk drive is disclosed. In seeking a track in a disk. the track number and the direction in the fine seek are used for adjusting a voltage waveform in the rough seek. The variation of an optic disk drive due to mechanic friction or torque variation of motor can be overcome so as to achieve the same accuracy as being installed with a speed sensor. Since no speed sensor is required to be installed on the track seeking means, the cost in manufacturing is reduced greatly.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: October 21, 2003
    Assignee: Lite-On It Corporation
    Inventor: Yao-Chou Tsai
  • Method for determining vertical or horizontal operation of optical disk driver
    Patent number: 6501716
    Abstract: A method for determining vertical or horizontal operation of optical disk driver is proposed. A feedback signal from a pick-up head of the optical disk driver is sent to a pre-amplifier to generate a focus error signal. The focus error signal is sent to a compensator to generate a compensation voltage. A low-pass filter removes high-frequency components of the compensation voltage to obtain a DC component of the compensation voltage. A comparator compares the DC component of the compensation voltage with a predetermined threshold value to discriminate the vertical or horizontal operation of optical disk driver.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: December 31, 2002
    Assignee: Lite-On It Corporation
    Inventor: Yao-Chou Tsai
  • Method of rapidly adjusting optical drive focus error level
    Publication number: 20020186625
    Abstract: The present invention discloses a method of rapidly adjusting optical drive focus error signal level. First, select a referral focus error level. Then, sink the object lens to the bottom, and start moving the object lens in a direction of the disk.
    Type: Application
    Filed: November 26, 2001
    Publication date: December 12, 2002
    Inventors: Chien-Li Hung, Chi-Yuan Liu, Yao-Chou Tsai
  • Method for determining vertical or horizontal operation of optical disk driver
    Publication number: 20020126592
    Abstract: A method for determining vertical or horizontal operation of optical disk driver is proposed. A feedback signal from a pick-up head of the optical disk driver is sent to a pre-amplifier to generate a focus error signal. The focus error signal is sent to a compensator to generate a compensation voltage. A low-pass filter removes high-frequency components of the compensation voltage to obtain a DC component of the compensation voltage. A comparator compares the DC component of the compensation voltage with a predetermined threshold value to discriminate the vertical or horizontal operation of optical disk driver.
    Type: Application
    Filed: March 9, 2001
    Publication date: September 12, 2002
    Inventor: Yao-chou Tsai