Patents by Inventor Akira Matuki

Akira Matuki 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).

  • Moving-coil type pickup cartridge
    Patent number: 4488284
    Abstract: In a moving-coil type pickup cartridge, a vibrating system including an armature wound with a coil is disposed at an open end area of a magnet with a damper being interposed between the armature and the magnet, and the armature is placed directly under the influence of magnetic flux produced between the one and other ends of the magnet for generating a voltage without using any yoke.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: December 11, 1984
    Assignee: Nippon Columbia Co., Ltd.
    Inventors: Naohisa Aoki, Akira Matuki