Patents by Inventor Tarou Tonoduka

Tarou Tonoduka 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).

  • Optical communication module
    Patent number: 7215886
    Abstract: The present invention is related to an optical communication module for transmitting high frequency signals (e.g., 10 Gbit/s and higher data rates) between an optical element and an external circuit. In an illustrative embodiment, the optical communication module includes signal transmission lines and ground lines formed on a ceramic substrate, a flexible wiring board, and a printed circuit board. The widths of the signal lines and the ground lines vary, as well as the spacing between the signal and ground lines. This facilitates characteristic impedance matching among the signal lines to within about 50?.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: May 8, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Shigenobu Maruyama, Kazumi Kawamoto, Hiroaki Furuichi, Tooru Yoshida, Isamu Yoshida, Katsuya Oono, Osamu Yamada, Hiroshi Ibe, Shigeru Tokita, Tarou Tonoduka, Yasunori Iwafuji, Katsumi Kuroguchi
  • Optoelectronic transceiver with power voltage supply detection
    Patent number: 7167654
    Abstract: Optical transmission equipment with more than one power supply which can, when turning on the power supplies, set predetermined function of a signal processing circuit after a predetermined time period after the last turn-on of the power supply and can enable the operation of a drive circuit of the light emitting device after an additional predetermined time period.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: January 23, 2007
    Assignee: OpNext Japan, Inc.
    Inventors: Shigeru Tokita, Tomokazu Tanaka, Cleitus Antony, Tarou Tonoduka, Masazumi Noguchi
  • Optical communication module
    Publication number: 20040208211
    Abstract: A ceramic substrate is provided through a stem of a can-package, the desired number of wirings including the high speed signal wirings are formed on this ceramic substrate and the necessary electronic components other than a light-emitting/photosensitive element such as driver LSI and amplifying LSI or the like are also accommodated within the can-package.
    Type: Application
    Filed: August 15, 2002
    Publication date: October 21, 2004
    Applicant: OpNext Japan, Inc.
    Inventors: Shigenobu Maruyama, Kazumi Kawamoto, Hiroaki Furuichi, Tooru Yoshida, Isamu Yoshida, Katsuya Oono, Osamu Yamada, Hiroshi Ibe, Shigeru Tokita, Tarou Tonoduka, Yasunori Iwafuji, Katsumi Kuroguchi
  • Optical transmission equipment
    Publication number: 20030228153
    Abstract: Optical transmission equipment with more than one power supply which can, when turning on the power supplies, set predetermined function of a signal processing circuit after a predetermined time period after the last turn-on of the power supply and can enable the operation of a drive circuit of the light emitting device after an additional predetermined time period.
    Type: Application
    Filed: April 17, 2003
    Publication date: December 11, 2003
    Applicant: OpNext Japan, Inc.
    Inventors: Shigeru Tokita, Tomokazu Tanaka, Cleitus Antony, Tarou Tonoduka, Masazumi Noguchi