Patents by Inventor Der-Seng Liang

Der-Seng Liang 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).

  • Rotary optical encoder
    Patent number: 7105803
    Abstract: A rotary optical encoder is described to provide the pole position of the rotor in a permanently magnetized motor. Using a simple opening design of code tracks and two light sensors along with a corresponding processing circuit, only one additional code track is required on the code wheel to output phase-changing signals. Thus the rotary optical encoder with phase-changing signal with low cost and small size is implemented.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: September 12, 2006
    Assignee: Delta Electronics, Inc.
    Inventors: Hong-Cheng Sheu, Der-Seng Liang
  • Rotary optical encoder
    Publication number: 20050199790
    Abstract: A rotary optical encoder is described to provide the pole position of the rotor in a permanently magnetized motor. Using a simple opening design of code tracks and two light sensors along with a corresponding processing circuit, only one additional code track is required on the code wheel to output phase-changing signals. Thus the rotary optical encoder with phase-changing signal with low cost and small size is implemented.
    Type: Application
    Filed: June 23, 2004
    Publication date: September 15, 2005
    Inventors: Hong-Cheng Sheu, Der-Seng Liang