Patents by Inventor Naoya Nagasawa

Naoya Nagasawa 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).

  • Fire detector unit
    Patent number: 6737977
    Abstract: An improved fire detector unit has a plastic base defining a smoke chamber for detection of a smoke density in terms of light scattering due to the smoke particles in the smoke chamber. The base carries a circuit board mounting a light emitting element, a light receiving element, and other components forming a fire detecting circuit responsible for generating a fire warning signal based upon the detected smoke density. A metal-made electromagnetic shield is molded into the base to protect the light receiving element from electromagnetic radiation noises. The electromagnetic shield includes a ground terminal for connection with a ground line of the circuit board. In addition, terminal pins are molded into the base for electrical and physical connection of the circuit board to the base.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: May 18, 2004
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Takayuki Nishikawa, Shoichi Oka, Koji Sakamoto, Takeshi Wada, Yasuyuki Kawano, Kenji Toyoda, Naoya Nagasawa, Shinji Kirihata
  • Fire detector unit
    Publication number: 20020154018
    Abstract: An improved fire detector unit has a plastic base defining a smoke chamber for detection of a smoke density in terms of light scattering due to the smoke particles in the smoke chamber. The base carries a circuit board mounting a light emitting element, a light receiving element, and other components forming a fire detecting circuit responsible for generating a fire warning signal based upon the detected smoke density. A metal-made electromagnetic shield is molded into the base to protect the light receiving element from electromagnetic radiation noises. The electromagnetic shield includes a ground terminal for connection with a ground line of the circuit board. In addition, terminal pins are molded into the base for electrical and physical connection of the circuit board to the base.
    Type: Application
    Filed: January 9, 2002
    Publication date: October 24, 2002
    Applicant: MATSUSHITA ELECTIC WORKS, LTD.
    Inventors: Takayuki Nishikawa, Shoichi Oka, Koji Sakamoto, Takeshi Wada, Yasuyuki Kawano, Kenji Toyoda, Naoya Nagasawa, Shinji Kirihata