Patents by Inventor Masaru Yamagami

Masaru Yamagami 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).

  • Publication number: 20180352336
    Abstract: A cap member is attached to an opening end portion of a bobbin on which a voice coil is wound. The cap member includes a bobbin reinforcement portion including a cylindrical portion and a bottom surface portion. The cylindrical portion opposes an inner surface of the bobbin, and the cylindrical portion and the inner surface of the bobbin are fixed to each other in at least a vibration plate fixed portion and a damper member fixed portion.
    Type: Application
    Filed: April 17, 2018
    Publication date: December 6, 2018
    Applicant: ALPINE ELECTRONICS, INC.
    Inventor: Masaru Yamagami
  • Patent number: 9479873
    Abstract: A support chassis mounted on a sounding side of a speaker apparatus is formed of an iron material. The support chassis is formed in a shape in which a central supporting part nears a main-body chassis. A magnetic field generating unit is fixed to the central supporting part on a side of a recess of the support chassis. The support chassis includes a frame part, the central supporting part, and spoke parts. In the spoke part, a width dimension D1 of an inner end part is formed narrower than a width dimension D2 of an outer end part. Therefore, a resistance in a case where a magnetic flux passes through the spoke part increases, and the leaked magnetic field is hardly induced from the magnetic field generating unit to the spoke part. Therefore, a reduction in a speaker output can be prevented.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: October 25, 2016
    Assignee: Alpine Electronics, Inc.
    Inventors: Masaru Yamagami, Arata Tada, Kei Tanabe
  • Publication number: 20160029127
    Abstract: A support chassis mounted on a sounding side of a speaker apparatus is formed of an iron material. The support chassis is formed in a shape in which a central supporting part nears a main-body chassis. A magnetic field generating unit is fixed to the central supporting part on a side of a recess of the support chassis. The support chassis includes a frame part, the central supporting part, and spoke parts. In the spoke part, a width dimension D1 of an inner end part is formed narrower than a width dimension D2 of an outer end part. Therefore, a resistance in a case where a magnetic flux passes through the spoke part increases, and the leaked magnetic field is hardly induced from the magnetic field generating unit to the spoke part. Therefore, a reduction in a speaker output can be prevented.
    Type: Application
    Filed: April 24, 2015
    Publication date: January 28, 2016
    Inventors: Masaru Yamagami, Arata Tada, Kei Tanabe