Patents by Inventor Koji Sekizawa

Koji Sekizawa 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).

  • Electromagnetic actuator and shutter device for camera
    Patent number: 6821033
    Abstract: An electromagnetic actuator applied to a camera shutter device includes a rotatable disk-shaped rotor (10) magnetized with different polarities and having an output portion (10b), a first plate-like yoke (40) with a first magnetic pole part (41) opposed to the outer peripheral surface of the rotor (10) and a second plate-like yoke (50) with a second magnetic pole part (51) opposed to the outer peripheral surface of the rotor (10), and a first coil (20) and a second coil (30) wound around the joint areas of the yokes so that the first and second coils become flat in the same direction as the first yoke (40) and the second yoke (50). By virtue of this configuration, the electromagnetic actuator can be thinned. Furthermore, the camera shutter device using this electromagnetic actuator and thus the camera can be thinned and miniaturized.
    Type: Grant
    Filed: July 19, 2002
    Date of Patent: November 23, 2004
    Assignee: Nidec Copal Corporation
    Inventors: Koji Sekizawa, Nobuyoshi Inoue, Kiyosi Toma
  • Electromagnetic actuator and shutter device for camera
    Publication number: 20030012573
    Abstract: An electromagnetic actuator applied to a camera shutter device includes a rotatable disk-shaped rotor (10) magnetized with different polarities and having an output portion (10b), a first plate-like yoke (40) with a first magnetic pole part (41) opposed to the outer peripheral surface of the rotor (10) and a second plate-like yoke (50) with a second magnetic pole part (51) opposed to the outer peripheral surface of the rotor (10), and a first coil (20) and a second coil (30) wound around the joint areas of the yokes so that the first and second coils become flat in the same direction as the first yoke (40) and the second yoke (50). By virtue of this configuration, the electromagnetic actuator can be thinned. Furthermore, the camera shutter device using this electromagnetic actuator and thus the camera can be thinned and miniaturized.
    Type: Application
    Filed: July 19, 2002
    Publication date: January 16, 2003
    Inventors: Koji Sekizawa, Nobuyoshi Inoue, Kiyosi Toma