Patents by Inventor Koji Nakagawara

Koji Nakagawara 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).

  • Illumination system
    Patent number: 8957591
    Abstract: An illumination system includes a lighting apparatus having a solid-state light emitting element as a light source; and a dimmer including a bidirectional switching element having a self-sustaining function and connected to a serial circuit of the lighting apparatus and an external power source. The dimmer varies a conduction angle of the bidirectional switching element by controlling a phase of an AC voltage of the external power source, wherein the lighting apparatus performs dimming of the light source based on the conduction angle of the bidirectional switching element, and the dimmer continues to apply driving current to the bidirectional switching element during a first period, which is a part of a second period, the bidirectional switching element being allowed to conduct throughout the second period.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: February 17, 2015
    Assignee: Panasonic Corporation
    Inventors: Yoshinobu Murakami, Koji Nakagawara, Masahito Ohnishi, Masahiro Naruo, Shigeru Ido, Kazuhiro Nisimoto, Hiromitsu Mizukawa
  • ILLUMINATION SYSTEM
    Publication number: 20120223651
    Abstract: An illumination system includes a lighting apparatus having a solid-state light emitting element as a light source; and a dimmer including a bidirectional switching element having a self-sustaining function and connected to a serial circuit of the lighting apparatus and an external power source. The dimmer varies a conduction angle of the bidirectional switching element by controlling a phase of an AC voltage of the external power source, wherein the lighting apparatus performs dimming of the light source based on the conduction angle of the bidirectional switching element, and the dimmer continues to apply driving current to the bidirectional switching element during a first period, which is a part of a second period, the bidirectional switching element being allowed to conduct throughout the second period.
    Type: Application
    Filed: February 27, 2012
    Publication date: September 6, 2012
    Applicant: Panasonic Corporation
    Inventors: Yoshinobu MURAKAMI, Koji Nakagawara, Masahito Ohnishi, Masahiro Naruo, Shigeru Ido, Kazuhiro Nisimoto, Hiromitsu Mizukawa