A device includes a memory that stores a measurement-result of a first magnetization of a permanent-magnet corresponding to an external-magnetic field in an open-magnetic circuit; and a processor to divide the permanent-magnet into meshes, generate a function based on the measurement-result, the function indicating a second magnetization corresponding to the external-magnetic field in a closed-magnetic circuit, the function including a parameter having a value, calculate a diamagnetic-field corresponding to the external-magnetic field based on the second magnetization for each of the meshes, calculate a third magnetization of the permanent-magnet, calculate an average of the third magnetizations, calculate an error between the first magnetization and the calculated average, correct the value of the parameter, and repeat the calculation of the second magnetization, the diamagnetic-field, the third magnetizations, the average, and the error, and the correction of the value of the parameter until the error falls below a threshold.

A magnetic substance detection sensor includes a support substrate, a semiconductor chip provided on the support substrate and having a magnetic field detection element, a permanent magnet provided on the support substrate, and a resin encapsulation layer covering the semiconductor chip and the permanent magnet. The resin encapsulation layer has a first resin layer exposing the permanent magnet and covering the semiconductor chip, and a second resin layer continuously covering the permanent magnet and the first resin layer, and stress caused by curing contraction of the second resin layer is smaller than that of the first resin layer.

A magnetic substance detection sensor includes a support substrate, a semiconductor chip provided on the support substrate and having a magnetic field detection element, a permanent magnet provided on the support substrate, and a resin encapsulation layer covering the semiconductor chip and the permanent magnet. The resin encapsulation layer has a first resin layer exposing the permanent magnet and covering the semiconductor chip, and a second resin layer continuously covering the permanent magnet and the first resin layer, and stress caused by curing contraction of the second resin layer is smaller than that of the first resin layer.

Provided is a wire diagnosis apparatus mounted on a lifting device, which has a platform having a hook disposed at a lower portion to lift an object. The wire diagnosis apparatus includes: a standing unit detachably combined with any one among an inlet and an outlet where a wire of the platform comes in and out; a sensing holder unit formed in a cylindrical shape perforated in the middle and detachably combined with a stand combining part of the standing unit to sense the wire; and a coupling unit detachably combining the sensing holder unit with the stand combining part of the standing unit.

A magnetic sensor device comprises a substrate having a surface and a magnetic sensor. A plurality of magnetic cores is disposed on, over, below or in direct contact with a substrate surface, at least one of the magnetic cores having an electrical conductor helically wound around the core forming a coil having a coil length. Each magnetic core is separated from any other magnetic core by a gap length. A current passing through the one or more coils generates a magnetic field. The plurality of cores and gaps form at least one closed magnetic circuit along which the generated magnetic field flux passes, and the total length of the at least one closed magnetic circuit is at least twice the total length of the plurality of gaps of the at least one closed magnetic circuit through which the at least a portion of the magnetic field flux passes.

A magnetic sensor device comprises a substrate having a surface and a magnetic sensor. A plurality of magnetic cores is disposed on, over, below or in direct contact with a substrate surface, at least one of the magnetic cores having an electrical conductor helically wound around the core forming a coil having a coil length. Each magnetic core is separated from any other magnetic core by a gap length. A current passing through the one or more coils generates a magnetic field. The plurality of cores and gaps form at least one closed magnetic circuit along which the generated magnetic field flux passes, and the total length of the at least one closed magnetic circuit is at least twice the total length of the plurality of gaps of the at least one closed magnetic circuit through which the at least a portion of the magnetic field flux passes.

A wearable audio device with a magnetic field sensor that is constructed and arranged to sense the Earth's magnetic field. A magnet in the earphone, for example the magnet of the electro-acoustic transducer, produces a first magnetic field having a first magnetic field strength. A docking or parking magnet in the earphone produces a second magnetic field that is configured to reduce an influence of the first magnetic field on the magnetic field sensor.

A magnetic sensor includes a base material, a plurality of magnets provided at predetermined spacing on the base material, and a plurality of magnetic detection parts respectively provided close to the plurality of magnets. Each of the plurality of magnetic detection parts outputs a signal in accordance with change in the magnetic field accompanying deformation of the base material.

A magnetic sensor includes a base material, a plurality of magnets provided at predetermined spacing on the base material, and a plurality of magnetic detection parts respectively provided close to the plurality of magnets. Each of the plurality of magnetic detection parts outputs a signal in accordance with change in the magnetic field accompanying deformation of the base material.

A power generating system using magnetic induction and a method of operating same are disclosed. The power generating system includes at least one stationary electromagnet receiving an excitation voltage from a power supply. The at least one stationary electromagnet has a north pole, a south pole and a magnetic field. The system also includes at least one stationary coil positioned inside the magnetic field and intersected by magnetic field lines of the at least one electromagnet such that when the at least one electromagnet is excited, an electromotive force (EMF) is induced in the at least one stationary coil. The power supplied may be AC or DC. The system also includes a frequency modulator for changing the rate of electric current introduced to the at least one electromagnet so that the change of current rate will cause an EMF to be induced in the coil.