Patents Assigned to Jeco Company, Ltd.
  • Patent number: 5132578
    Abstract: A stepping motor for a timepiece is constituted by a rotatable rotor magnet on an outer surface of which magnetic poles having different polarities are alternately formed, and two stator assemblies, each including a pair of stators opposing around the rotor magnet to have a gap and having stator magnetic pole portions, and an excitation coil for exciting the pair of stators, for supplying currents to the excitation coils to rotate the rotor magnet. The two stator assemblies are disposed to be separated by a predetermined distance in an axial direction of the rotor magnet, so that stator gap central lines of the two stator assemblies cross each other at an angle of 90.degree. when viewed from the axial direction.
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: July 21, 1992
    Assignee: Jeco Company, Ltd.
    Inventors: Toru Iwasa, Noboru Watanabe, Syouichi Mitsugi, Katsumi Yokota
  • Patent number: 4928060
    Abstract: A driving circuit for driving a crossed-coil type instrument used for reading a physical quantity in which a pair of windings surrounding a movable magnet carrying a pointer needle thereon are disposed to cross each other with a predetermined mechanical angle. The driving circuit comprises a digital data conversion circuit supplied with an electrical signal representing the physical quantity to be measured for producing a digital data representing the electrical signal, a pulse data producing circuit supplied with the digital data for producing a number of pulses in correspondence with the digital data, and a drive signal generating circuit supplied with the pulses for generating first and second analog drive signals therefrom. The driving signals are respectively supplied to the first and second windings for moving the magnet disposed in the first and second windings.
    Type: Grant
    Filed: February 1, 1989
    Date of Patent: May 22, 1990
    Assignee: Jeco Company, Ltd.
    Inventor: Akio Ito