Patents by Inventor Seiichi Tezuka

Seiichi Tezuka 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
    Patent number: 8189823
    Abstract: An object of the present invention is to provide a speaker system in which a woofer and a group of tweeters are substantially coaxially arranged, and sound waves emitted from the woofer and sound waves emitted from the tweeter are less likely to interfere with each other in at least one direction, and whose sound pressure frequency characteristics easily stabilize. A speaker system according to the present invention includes a woofer and three or more tweeters, and the tweeters are arranged in front of the woofer in a circular-arc formation.
    Type: Grant
    Filed: November 12, 2007
    Date of Patent: May 29, 2012
    Assignee: Toa Corporation
    Inventors: Seiichi Tezuka, Tsutomu Yoshioka
  • SPEAKER SYSTEM
    Publication number: 20100027827
    Abstract: An object of the present invention is to provide a speaker system in which a woofer and a group of tweeters are substantially coaxially arranged, and sound waves emitted from the woofer and sound waves emitted from the tweeter are less likely to interfere with each other in at least one direction, and whose sound pressure frequency characteristics easily stabilize. A speaker system 4 according to the present invention includes a woofer 2 and three or more tweeters 3, and the tweeters 3 are arranged in front of the woofer 2 in a circular-arc formation.
    Type: Application
    Filed: November 12, 2007
    Publication date: February 4, 2010
    Applicant: TOA CORPORATION
    Inventors: Seiichi Tezuka, Tsutomu Yoshioka