| 摘要 |
<p>PURPOSE:To efficiently detect the magnetic field from a magnetic label body and to enhance detection sensitivity by providing a U-shape magnetic core to a detection part and collectively applying winding to the center part of said magnetic core. CONSTITUTION:An exciting part 5 generating an AC magnetic field and magnetizing the magnetic label body 3 laid on the advance route of an unmanned feed vehicle in a strip-like state and a pair of left and right detection parts 6, 6' detecting the magnetic field generated in the label body 3 on the basis of induced voltage from the left and right and outputting the steering control signal of the unmanned feed vehicle are mounted. The detection part 6 is constituted so that the shape of a magnetic core 1 of a coil is formed into a U-shape to reduce the demagnetization factor of said core and the magnetic core is made easy to receive the magnetic flux from the label body 3 and winding 4 is collectively applied to the center part of the U-shape core and the parts 2 to which no winding is applied are arranged so as to turn toward the label body 3. The magnetic flux 7 emitted from the label body 3 gathers to a high magnetic permeability part 2 and becomes vertical to the cross-section of the coil when passes through the coil. Since this vertical magnetic flux induces voltage in the coil, the disturbance of a magnetic field can be efficiently detected as the change of induced voltage.</p> |
