| 摘要 |
A processor (12) comprises, as a mechanism for controlling the strength of a magnetic field for position sensing, a section (43) for recording the position sensing results in the past, a section (48) for deriving the moving speed of a capsule endoscope (2) from a variation of the position thereof, a section (49) for deriving the position range of the capsule endoscope (2) from the derived moving speed and the positions of the capsule endoscope (2) in the past, and a section (50) for controlling the strength of a magnetic field produced by a second linear magnetic field producing part (10) and a diffusion field producing part (11) according to the derived range. A position sensor capable of forming a required and sufficient magnetic field for detecting position is realized when the position of an object, e.g. a capsule endoscope, is detected using a magnetic field for detecting position having position dependence. |
