| 摘要 |
<P>PROBLEM TO BE SOLVED: To estimate a position of an RFID tag (an article) on a two-dimensional plane by use of a simpler sensor. <P>SOLUTION: The magnetic sensor includes: a first sensor 1 calculating a cosine-weighted primary Fourier coefficient of a magnetic field on a circumference; and a second sensor 2 calculating a sine-weighted primary Fourier coefficient of the magnetic field on the circumference. The first sensor 1 has a plurality of loop coils C1-C16 disposed on the circumference, the numer of turns of each loop coil C1-C16 is proportional to cos θ when a deflection angle of a position wherein each loop coil C1-C16 is disposed is defined as θ, the loop coils C1-C4, C14-C16 in each of which a value of the cos θ is in a negative position are reversely wound, and the loop coils C1-C16 are connected by one wire 5. The second sensor 2 is formed in the substantially same plane as the first sensor 1 by rotating the first sensor 1 by 90°. <P>COPYRIGHT: (C)2011,JPO&INPIT |
