Patents by Inventor Norimasa Kumada

Norimasa Kumada 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).

  • Patent number: 5168338
    Abstract: A solid-state imaging device includes a photodiode array having a plurality of pixels, each pixel including a second conductivity type region formed in a first conductivity type semiconductor layer, an electrode common to all the pixels and disposed on the first conductivity type semiconductor layer, a signal transfer part for transferring signal charges generated in the pixels and a DC voltage source for applying a DC voltage in a forward direction to the pixels. The reverse bias voltage applied to a photodiode due to the voltage applied by the signal input stage of the signal transfer part is canceled by the forward DC voltage applied to the common electrode. As a result, the operating points of the pixels are uniform when nearly zero bias voltage is applied to the pixels.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: December 1, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Norimasa Kumada, Yoshihiro Hisa, Yasuaki Yoshida
  • Patent number: 5146302
    Abstract: A solid-state imaging device utilizing a charge skimming transfer system includes a sampling circuit for each of a plurality of pixels for detecting a quantity of signal charge light-electricity converted by the respective pixels and outputs a voltage level in accordance therewith, and a charge input section for performing skimming transfer of the signal charge light-electricity converted by the respective pixels using the output voltage of said sampling circuit as a skimming voltage thereof.
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: September 8, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Norimasa Kumada