Patents by Inventor Myoung-cher Cho

Myoung-cher Cho 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).

  • Apparatus for and method of controlling photo diode using digital potentiometer
    Patent number: 7417940
    Abstract: An optical pick up, including: a laser diode which outputs a light in response to an input current; a photo diode which receives the light and outputs a voltage; a digital potentiometer which adjusts the voltage output by the photo diode according to a voltage adjusting signal; and a controller which outputs the input current, sets a first reference voltage to be outputted by the photo diode according to the light, and outputs the voltage adjusting signal to the digital potentiometer according to a difference between the output voltage and the reference voltage.
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: August 26, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hong-kuk Kim, Chul-ho Jeon, Myoung-cher Cho
  • Apparatus for and method of controlling photo diode using digital potentiometer
    Publication number: 20050163019
    Abstract: An optical pick up, including: a laser diode which outputs a light in response to an input current; a photo diode which receives the light and outputs a voltage; a digital potentiometer which adjusts the voltage output by the photo diode according to a voltage adjusting signal; and a controller which outputs the input current, sets a first reference voltage to be outputted by the photo diode according to the light, and outputs the voltage adjusting signal to the digital potentiometer according to a difference between the output voltage and the reference voltage.
    Type: Application
    Filed: August 3, 2004
    Publication date: July 28, 2005
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Hong-kuk Kim, Chul-ho Jeon, Myoung-cher Cho