Patents by Inventor Keiji Ookuma

Keiji Ookuma 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).

  • Analog-digital converter, solid-state image sensor, and electronic apparatus for increased resolution of an image
    Patent number: 9876976
    Abstract: An analog-digital converter includes: a first comparator configured to make a comparison between a pixel voltage and a first reference voltage, the pixel voltage being a signal voltage outputted from a pixel including an photoelectric conversion element, the pixel voltage corresponding to electric charge generated by the photoelectric conversion element; a second comparator configured to make a comparison between the pixel voltage and a second reference voltage; and a voltage follower configured to connect an input terminal for the first reference voltage of the first comparator and an input terminal for the second reference voltage of the second comparator through a switch.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: January 23, 2018
    Assignee: SONY CORPORATION
    Inventor: Keiji Ookuma
  • ANALOG-DIGITAL CONVERTER, SOLID-STATE IMAGE SENSOR, AND ELECTRONIC APPARATUS FOR INCREASED RESOLUTION OF AN IMAGE
    Publication number: 20160198112
    Abstract: An analog-digital converter includes: a first comparator configured to make a comparison between a pixel voltage and a first reference voltage, the pixel voltage being a signal voltage outputted from a pixel including an photoelectric conversion element, the pixel voltage corresponding to electric charge generated by the photoelectric conversion element; a second comparator configured to make a comparison between the pixel voltage and a second reference voltage; and a voltage follower configured to connect an input terminal for the first reference voltage of the first comparator and an input terminal for the second reference voltage of the second comparator through a switch.
    Type: Application
    Filed: March 10, 2016
    Publication date: July 7, 2016
    Inventor: Keiji OOKUMA
  • Analog-digital converter, solid-state image sensor, and electronic apparatus for increased resolution of an image
    Patent number: 9313436
    Abstract: An analog-digital converter includes: a first comparator configured to make a comparison between a pixel voltage and a first reference voltage, the pixel voltage being a signal voltage outputted from a pixel including an photoelectric conversion element, the pixel voltage corresponding to electric charge generated by the photoelectric conversion element; a second comparator configured to make a comparison between the pixel voltage and a second reference voltage; and a voltage follower configured to connect an input terminal for the first reference voltage of the first comparator and an input terminal for the second reference voltage of the second comparator through a switch.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: April 12, 2016
    Assignee: SONY CORPORATION
    Inventor: Keiji Ookuma
  • ANALOG-DIGITAL CONVERTER, SOLID-STATE IMAGE SENSOR, AND ELECTRONIC APPARATUS
    Publication number: 20140166857
    Abstract: An analog-digital converter includes: a first comparator configured to make a comparison between a pixel voltage and a first reference voltage, the pixel voltage being a signal voltage outputted from a pixel including an photoelectric conversion element, the pixel voltage corresponding to electric charge generated by the photoelectric conversion element; a second comparator configured to make a comparison between the pixel voltage and a second reference voltage; and a voltage follower configured to connect an input terminal for the first reference voltage of the first comparator and an input terminal for the second reference voltage of the second comparator through a switch.
    Type: Application
    Filed: November 22, 2013
    Publication date: June 19, 2014
    Applicant: SONY CORPORATION
    Inventor: Keiji Ookuma