| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic field detector which has high sensitivity and is miniaturized and whose power consumption is reduced, when a magnetic field is detected. SOLUTION: The magnetic field detector is composed of a first magnetism sensing element 10, which is arranged and installed so as to detect the first axial component of an external magnetic field and which is excited in the circumferential direction by a pulse current. The detector is composed of a second magnetism sensing element, which is arranged and installed on a face having a normal line common to a face used to arrange and install the first magnetism sensing element, arranged and installed for detecting at least the second axial component as the other one of the external magnetic field and excited in the circumferential direction by a pulse current. The detector is composed of a first detection coil 11, which is wound in the circumferential direction of the first magnetism sensing element and which detects changes in a magnetic flux in a first axial direction. The detector is composed of a second detection coil, which is wound in the circumferential direction of the second magnetism sensing element and which detects changes in magnetic flux in a second axial direction. A magnetic field is detected by the detection coil, utilizing the direction of a magnetic vector by the excitation in the circumferential direction due to the pulse current, is modulated by the magnetic field in the axial direction.
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