Patents by Inventor Kazunari Matsuzaki

Kazunari Matsuzaki 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).

  • Patent number: 7042211
    Abstract: A multirotation type encoder of the invention includes a first encoder 20 attached to a rotating shaft 11 of a rotating machine 10 for detecting an absolute value rotational angle within one rotation, and a second encoder for counting a multirotation amount of the rotating shaft 11 by using a speed reducing mechanism 30 by magnetic coupling and the second encoder 40 is constituted by a first magnetic gear 31 directly connected to the rotating shaft and magnetized in multiple poles and at least one second magnetic gear 32 arranged to be opposed thereto in noncontact and magnetized in multiple poles by a number of magnetic poles larger than that of the first magnetic gear 31 and is constituted to count a multirotation amount by detecting a rotational angle of the second magnetic gear by the second encoder.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: May 9, 2006
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Takefumi Kabashima, Kazunari Matsuzaki, Koji Uemura, Takashi Nagase
  • Patent number: 6937008
    Abstract: A rotating angle detector (10) according to the invention comprises magnetic field generating means for rotating integrally with a detected member and uniformly generating a magnetic field in one direction perpendicularly to a rotating axis in a stationary state, and at least two magnetic sensors (41), (42), (43) and (44) provided to generate one sine wave for one rotation of the magnetic field generating means respectively, wherein input current terminals (61), (62), (63) and (64) of the magnetic sensor are connected in series. Moreover, it is also possible to employ such a structure that at least two signal differential amplifying means are arranged on a substrate provided with at least two magnetic sensors and there is provided a circuit wiring for causing an output sent from each of the magnetic sensors to pass through the signal differential amplifying means.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: August 30, 2005
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Kazunari Matsuzaki, Takashi Nagase
  • Publication number: 20040246148
    Abstract: There is provided a multirotation type encoder which is small-sized, having nomechanical contact portion other than a bearing, having high reliability and long life and dispensing with interchange of a battery.
    Type: Application
    Filed: April 16, 2004
    Publication date: December 9, 2004
    Inventors: Takefumi Kabashima, Kazunari Matsuzaki, Koji Uemura, Takashi Nagase
  • Publication number: 20040150391
    Abstract: A rotating angle detector (10) according to the invention comprises magnetic field generating means for rotating integrally with a detected member and uniformly generating a magnetic field in one direction perpendicularly to a rotating axis in a stationary state, and at least two magnetic sensors (41), (42), (43) and (44) provided to generate one sine wave for one rotation of the magnetic field generating means respectively, wherein input current terminals (61), (62), (63) and (64) of the magnetic sensor are connected in series.
    Type: Application
    Filed: August 14, 2003
    Publication date: August 5, 2004
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kazunari Matsuzaki, Takashi Nagase
  • Patent number: 6762897
    Abstract: A magnetic encoder apparatus comprises a permanent magnet 2 fixed to a rotating body 1, a magnetic field detection element 4 which is opposed to the permanent magnet 2 through an air gap and attached to a fixed body 3, and a signal processing circuit to process a signal from the magnetic field detection element 4. The permanent magnet 2 is formed into disk-like, and magnetized in one direction which is perpendicular to the shaft of the rotating body 1. The magnetic field detection element 4 is arranged on the outer peripheral side of the permanent magnet 2 through an air gap. Further, the fixed body 3 is formed by a ring-like magnetic substance, and an air gap is provided in the circumferential direction, and the magnetic field detection element may be provided in the air gap portion. Accordingly, a magnetic encoder apparatus in which the structure is simple, the resolution is very high, the accuracy is high, and the size is small, can be obtained.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: July 13, 2004
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Takefumi Kabashima, Kazunari Matsuzaki, Tomohiro Matsuo, Tsuyoshi Asanuma
  • Patent number: 4160591
    Abstract: A camera with a shutter including opening and closing blades releasable, respectively, in response to a mechanical actuation and exposure control circuit for making an exposure which is assured by energizing the solenoid of an electromagnet with power supply from a battery. When the voltage of the battery drops below a satisfactory operating level, the opening blade is locked in automatic response to the mechanical actuation, and a shutter charging and film winding mechanism is no longer effective to operate, thereby preventing wasteful consumption of film due to blank exposures. Upon removal of the battery from a chamber therefor, the shutter charging and film winding mechanism is rendered again effective, and the release of the closing blade is mechanically retarded for a certain length of time from the mechanical release actuation of the opening blade.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: July 10, 1979
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toyotoshi Suzuki, Kazunari Matsuzaki