Patents by Inventor Katsuhiko Tsumori

Katsuhiko Tsumori 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 system having processing circuitry
    Patent number: 7130441
    Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects from the front side of the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: October 31, 2006
    Assignees: Fujitsu Ten Limited, Timedomain Corporation
    Inventors: Katsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki, Hiroyuki Yoshii
  • Speaker assembly having plural drivers
    Patent number: 7082208
    Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: July 25, 2006
    Assignees: Fujitsu Ten Limited, Timedomain Corporation
    Inventors: Katsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki, Hiroyuki Yoshii
  • Speaker assembly having plural drivers
    Publication number: 20040165738
    Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
    Type: Application
    Filed: March 2, 2004
    Publication date: August 26, 2004
    Inventors: Katsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki, Hiroyuki Yoshii
  • Speaker system having a processing circuitry
    Publication number: 20040165744
    Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
    Type: Application
    Filed: March 2, 2004
    Publication date: August 26, 2004
    Inventors: Katsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki, Hiroyuki Yoshii
  • Speaker system
    Patent number: 6751330
    Abstract: A driver unit is fixed to a stand. A front box and a rear box are directly fitted to the stand through a buffer material. A box comes into contact with the driver unit through a buffer material and is fixed to the stand. Therefore, sound of the driver unit is not transmitted to the box and the drop of sound quality of the speaker can be prevented. The driver unit is fixed to the stand at an immovable foundation, and sound energy can be efficiently transmitted from a speaker cone to the air.
    Type: Grant
    Filed: January 29, 2001
    Date of Patent: June 15, 2004
    Assignees: Fujitsu Ten Limited, Timedomain Corporation
    Inventors: Hiroshi Kowaki, Akira Nishikawa, Katsuhiko Tsumori, Hiroyuki Yoshii
  • Speaker apparatus
    Patent number: 6724909
    Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: April 20, 2004
    Assignees: Fujitsu Ten Limited, Timedomain Corporation
    Inventors: Katsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki, Hiroyuki Yoshii
  • Speaker apparatus
    Publication number: 20020057821
    Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
    Type: Application
    Filed: November 9, 2001
    Publication date: May 16, 2002
    Inventors: Katsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki, Hiroyuki Yoshii
  • Speaker system
    Publication number: 20010028724
    Abstract: A driver unit is fixed to a stand. A front box and a rear box are directly fitted to the stand through a buffer material. A box comes into contact with the driver unit through a buffer material and is fixed to the stand. Therefore, sound of the driver unit is not transmitted to the box and the drop of sound quality of the speaker can be prevented. The driver unit is fixed to the stand at an immovable foundation, and sound energy can be efficiently transmitted from a speaker cone to the air.
    Type: Application
    Filed: January 29, 2001
    Publication date: October 11, 2001
    Inventors: Hiroshi Kowaki, Akira Nishikawa, Katsuhiko Tsumori, Hiroyuki Yoshii