| 摘要 |
PURPOSE:To correct the error caused by neighboring magnetic substance, by placing elements detecting magnetism at right angles to each other on the same plane, and by correcting said error according to the maximum and the minimum values obtained by ratating them one revolution on the same plane. CONSTITUTION:Two detecting elements that generate outputs proportional to the amount of magnetic flux crossing the detecting elements are arranged horizontally at 90 deg. on the same plane. An angle between the central axis of a winding of the first detecting element and a horizontal component Beh of earth magnetism is made to be theta, near said element magnetic substance, SN exists, and when outputs of the first and the second detecting elements are made to be X, Y, X=KxBsx+KxBehcostheta, Y=Ky Bsy+KyBehsintheta are obtained. Here, Kx, Ky are constants, and Bsx, Bsy are components in the X, Y directions of SN. When the device is rotated with a change of from O to 360 deg., a locus of X, Y becomes an ellipse, SN shifts only the center of an ellipse, and X,Y change as shown in the figure. Hereby, X, Y, are corrected and operated as X'=X-(Xmax+Xmin)/2, Y'=Y-(Ymax+Ymin)/2, thereby obtaining an accurate desired compass direction. |
