Patents by Inventor Hideo Sekikawa

Hideo Sekikawa 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).

  • Speaker diaphragm and method of forming the same
    Publication number: 20060062423
    Abstract: It is an object of the present invention to ensure that when a speaker diaphragm having an adequate fire resistance is to be obtained, it is possible to ensure stability of various characteristics and thus avoid a deterioration of an audio characteristic of the speaker device. An expansive graphite is mixed/milled with at least one of a natural fiber, a chemical fiber, an inorganic fiber, a synthetic fiber and the like consisting of different fibers selected from the foregoing fibers (step of mixing/milling a fiber with an expansive graphite), thereby obtaining a paper slurry. The paper slurry is adjusted and heated at an adequate molding temperature necessary for the expansive graphite to expand, thereby effecting milling and molding (milling/molding step) and thus obtaining a milled material serving as a diaphragm substrate having a fire resistant layer formed by a heated expansion of the expanding agent.
    Type: Application
    Filed: September 20, 2005
    Publication date: March 23, 2006
    Inventors: Kazuharu Kawata, Hideo Sekikawa, Toshihiro Ishigaki
  • Speaker component, method of manufacturing the same and speaker apparatus including the same
    Publication number: 20050178516
    Abstract: To give solution to a problem that a fire-retarded speaker component has a high hygroscopicity and thus exhibits deteriorated acoustic properties, the speaker component undergoes strength drop, elastic modulus drop and internal loss due to fire retardant and the increase of the number of treatment steps adds to manufacturing cost. A speaker component formed by a paper product including a triphenyl phosphate fire retardant is used.
    Type: Application
    Filed: February 11, 2005
    Publication date: August 18, 2005
    Inventors: Hideo Sekikawa, Kazuharu Kawata, Toshihiro Ishigaki
  • Speaker diaphragm and method of manufacturing same
    Patent number: 6740202
    Abstract: A speaker diaphragm is formed from a material combining a fiber-type material and a ceramic-type-coating agent including metal alkoxide, metal hydroxide, and a colloidal or fine-particulate inorganic substance. The combining process for the ceramic-type-coating agent is performed before or after the fiber-type material is formed into a shape of the diaphragm.
    Type: Grant
    Filed: March 29, 2002
    Date of Patent: May 25, 2004
    Assignees: Pioneer Corporation, Tohoku Pioneer Corporation, Nippan Kenkyujo Co., Ltd.
    Inventors: Toshihiro Ishigaki, Hideo Sekikawa, Koji Maekawa, Tomoyuki Shimada
  • Speaker diaphragm and method of manufacturing same
    Publication number: 20020140136
    Abstract: A speaker diaphragm is formed from a material combining a fiber-type material and a ceramic-type-coating agent including metal alkoxide, metal hydroxide, and a colloidal or fine-particulate inorganic substance. The combining process for the ceramic-type-coating agent is performed before or after the fiber-type material is formed into a shape of the diaphragm.
    Type: Application
    Filed: March 29, 2002
    Publication date: October 3, 2002
    Applicant: PIONEER CORPORATION
    Inventors: Toshihiro Ishigaki, Hideo Sekikawa, Koji Maekawa, Tomoyuki Shimada