Patents Assigned to Bell Tech Co., Ltd.
  • Loudspeaker
    Patent number: 6134337
    Abstract: In a loudspeaker, a diaphragm is equally divided circumferentially into a plurality of regions which have the same shape with each other. Each of the divided regions is formed by a hyperbolic paraboloid. The hyperbolic paraboloid is obtained by moving a straight line connecting between two segments along these two segments. The hyperbolic paraboloid is large in strength and can suppress generation of the dividing vibration of the diaphragm.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: October 17, 2000
    Assignees: Bell Tech Co., Ltd., Foster Electric Co., Ltd.
    Inventor: Takashi Isaka