POSITION DETECTING SYSTEM AND POSITION DETECTING METHOD

摘要

A capsule medical device (10) is provided with an LC resonance circuit (111) which generates a resonance magnetic field at a resonance frequency corresponding to inputted induction signals or a drive magnetic field formed in a detection space (K), and a first switch (SW1) which electrically connects/disconnects the LC resonance circuit (111) and other wiring with/from each other.  An external device (200) is provided with drive coils (223a, 223b) which form the drive magnetic field in the detection space (K) corresponding to the drive signals, and a second switch (SW2) which electrically separates the drive coils (223a, 223b) from each other.  The second switch (SW2) is turned on when the first switch (SW1) is turned off, and the second switch is turned off when the first switch (SW1) is turned on.  The LC resonance circuit (111) generates the resonance magnetic field corresponding to the induction signals or the drive magnetic field.