Patents by Inventor Masaru Ogikubo

Masaru Ogikubo 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 stereophonic pickup cartridge
    Patent number: 4272652
    Abstract: A moving coil type stereophonic pickup cartridge is disclosed wherein a pair of magnetic air gaps are established corresponding to the walls of the sound groove of a 45.degree.-45.degree. stereophonic record and arranged such that the orientation of magnetic flux in the air gaps projects orthogonally to each other. The two magnetic air gaps are arranged on the right and the left of a cantilever fulcrum respectively. A coil is arranged within each of the gaps, each coil having a winding axis generally parallel to the axis direction of the cantilever. Each coil moves within its associated magnetic air gap integrally with the cantilever, thereby developing high output signals.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: June 9, 1981
    Assignee: Nippon Atsudenki K.K.
    Inventor: Masaru Ogikubo
  • Stereophonic pickup cartridge
    Patent number: 4037060
    Abstract: A stereophonic pickup cartridge includes both a rod-shaped armature and a disk-shaped armature, both of which magnetically interact with the pole pieces of coils to improve the magnetic efficiency of the cartridge.
    Type: Grant
    Filed: July 9, 1975
    Date of Patent: July 19, 1977
    Assignee: Nippon Atsudenki Kabushiki Kaisha t/a Japan Piezo Co., Ltd.
    Inventors: Ryuichi Uchida, Kaoru Terasaki, Masaru Ogikubo