Magnetic sensor apparatus, current sensor apparatus and magnetic sensor element

A magnetic sensor apparatus comprising:

• a magnetic detector for outputting a signal responsive to a magnetic field applied thereto;
• and
• a magnetic substance having a cavity in which the magnetic detector is placed;
• wherein:
• a ratio between a magnetic field to be measured and the magnetic field applied to the magnetic detector is set at a specific value, based on at least one of a first demagnetizing factor depending on a shape of the magnetic substance and a second demagnetizing factor depending on a shape of the cavity.

A magnetic sensor apparatus comprising:

• a fluxgate magnetic sensor element having a magnetic core and a coil wound around the core, the coil being provided for detecting an applied magnetic field;
• and
• detection means for detecting a magnetic field to be measured by detecting variations in inductance of the coil;
• wherein
• the magnetic core has such a shape that a demagnetizing factor thereof with respect to the magnetic field to be measured is different from a demagnetizing factor thereof with respect to a magnetic field generated by the coil.

A current sensor apparatus for measuring an electric current by measuring a magnetic field generated by the electric current, the apparatus comprising:

• a magnetic detector for outputting a signal responsive to a magnetic field applied thereto;
• negative feedback means for generating a negative feedback magnetic field to the magnetic detector;
• and
• a magnetic substance placed around the magnetic detector and having a first demagnetizing factor with respect to the magnetic field generated by the electric current and a second demagnitizing factor with respect to the negative feedback magnetic field, the first and second demagnitizing factors being different from each other.

A current sensor apparatus for measuring an electric current by measuring a magnetic field generated by the electric current, the apparatus comprising:

• a magnetic detector for outputting a signal responsive to a magnetic field applied thereto;
• and
• a magnetic substance having a cavity in which the magnetic detector is placed;
• wherein:
• a ratio between the magnetic field generated by the electric current and the magnetic field applied to the magnetic detector is set at a specific value, based on at least one of a first demagnetizing factor depending on a shape of the magnetic substance and a second demagnetizing factor depending on a shape of the cavity.

A current sensor apparatus for measuring an electric current by measuring a magnetic field generated by the electric current, the apparatus comprising:

• a fluxgate magnetic sensor element having a magnetic core and a coil wound around the core, the coil being provided for detecting an applied magnetic field;
• and
• detection means for detecting the magnetic field generated by the electric current by detecting variations in inductance of the coil;
• wherein
• the magnetic core has such a shape that a demagnetizing factor thereof with respect to the magnetic field generated by the electric current is different from a demagnetizing factor thereof with respect to a magnetic field generated by the coil.

A magnetic sensor apparatus comprising:

• a magnetic detector for outputting a signal responsive to a magnetic field applied thereto;
• negative feedback means for generating a negative feedback magnetic field to the magnetic detector;
• and
• a magnetic substance forming a part of the magnetic detector and having a first demagnetizing factor with respect to a magnetic field to be measured and a second demagnetizing factor with respect to the negative feedback magnetic field, said first and second demagnetizing factors being different from each other.

A current sensor apparatus for measuring an electric current by measuring a magnetic field generated by the electric current, the apparatus comprising:

• a magnetic detector for outputting a signal responsive to a magnetic field applied thereto;
• negative feedback means for generating a negative feedback magnetic field to the magnetic detector;
• and
• a magnetic substance forming a part of the magnetic detector and having a first demagnetizing factor with respect to the magnetic field generated by the electric current and a second demagnetizing factor with respect to the negative feedback magnetic field, the first and second demagnetizing factors being different from each other.