JP2006200955A - Instrument for measuring magnetic field distribution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument for measuring magnetic field distribution with satisfactory measurement sensitivity for measuring the noise field intensity emitted from an apparatus under measurement in a short period of time. <P>SOLUTION: This instrument for measuring the magnetic field distribution is equipped with a body 1 and a plurality of magnetic field probes 2 projecting from the body 1 for measuring the noise magnetic fields emitted from the apparatus 6 under measurement. The plurality of magnetic field probes 2 are extensible in the respective axial directions of the field probes 2 and it is suitable to arrange them in two or more ranks and files on an attachment surface of the body 1 for the field probes 2. The plurality of magnetic field probes 2 each comprise a magnetism shut-off means 2a within the body of each magnetic field probe 2 and an end part 2c of each magnetic field probe 2 is extensible. In measuring magnetic field distribution, the effect of magnetism of neighboring magnetic field probes 2 on each other is avoided by causing the end part 2c of each magnetic field probe 2 to be surrounded by the shut-off means 2a within the field probes 2, making it possible to meet magnetic field measurement of narrow pitches. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnetic field distribution measuring apparatus, and more particularly to a magnetic field distribution measuring apparatus used for measuring the intensity of noise radio waves radiated from a device under measurement.

Conventionally, in order to prevent noise radio waves radiated from electronic devices from impeding the operation of other electronic devices, the intensity of noise radio waves radiated from electronic devices is regulated in each country. In measuring the intensity of noise radio waves radiated from the electronic device, for example, the two-dimensional electromagnetic field intensity measuring device described in Patent Document 1 detects the electric field or magnetic field of the noise radio waves with an electromagnetic field probe.
JP-A-4-230874

  However, since the magnetic field probe is fixed at a predetermined height in the measurement apparatus described in Patent Document 1, the surface of the device to be measured is separated from the magnetic field probe, and the magnetic field strength is measured from the source to the measurement point. Since it depends on the distance, there is a problem that the measurement sensitivity is poor. In addition, since the measurement apparatus performs two-dimensional scanning using one magnetic field probe, there is a problem that it takes a long time for measurement.

  Therefore, the present invention has been made in view of the problems in the above-described conventional measuring apparatus, and provides a magnetic field distribution measuring apparatus having good measurement sensitivity and capable of performing measurement in a short time. Objective.

  In order to achieve the above object, the present invention provides a magnetic field distribution measuring apparatus for measuring a magnetic field of noise radio waves radiated from a device under test, comprising a main body and a plurality of magnetic field probes protruding from the main body. Features.

  According to the present invention, since the magnetic field distribution is measured by the plurality of magnetic field probes protruding from the main body, the measurement time can be shortened, and by combining such a magnetic field distribution measuring apparatus, various shapes can be obtained. It can correspond to the device under test.

  In the magnetic field distribution measuring apparatus, each of the plurality of magnetic field probes can be expanded and contracted in the axial direction of each of the magnetic field probes. As a result, the distance between the surface of the device under test and the tip of the magnetic field probe can be kept constant in a close contact state, and the measurement sensitivity is improved. That is, by pressing the magnetic field distribution measuring device against the device under measurement, each magnetic field probe expands and contracts along the unevenness of the surface of the device under measurement, and the magnetic field strength measurement depends on the distance from the magnetic field source to the measurement point. Therefore, measurement sensitivity is improved.

  In the magnetic field distribution measuring apparatus, each of the plurality of magnetic field probes can be expanded and contracted in the axial direction of each of the magnetic field probes by elastic expansion and contraction means. A spring, a damper, or the like can be used as the elastic expansion / contraction means.

  The plurality of magnetic field probes can be arranged vertically and horizontally on the mounting surface of the main body of the magnetic field probe. As a result, it is possible to measure the entire substrate or the like at a time, omitting the two-dimensional scanning operation during measurement, and shortening the measurement time.

  In the magnetic field distribution measuring apparatus, each of the plurality of magnetic field probes has a magnetic shielding means inside the main body of each magnetic field probe, and the tip of each magnetic field probe expands and contracts. The tip of the probe can be configured to be surrounded by the magnetic shielding means inside the main body of the magnetic field probe. As a result, the influence of magnetism between adjacent magnetic field probes can be avoided, and a narrow pitch magnetic field measurement can also be handled.

  As described above, according to the present invention, it is possible to provide a magnetic field distribution measuring apparatus that has good measurement sensitivity and can perform measurement in a short time.

  FIG. 1 shows an embodiment of a magnetic field distribution measuring apparatus according to the present invention. This magnetic field distribution measuring apparatus is roughly divided into a main body 1 and a highly accurate arrangement in the vertical and horizontal directions inside the main body 1, and each axis direction. A plurality of magnetic field probes 2 that can be expanded and contracted, an external connection connector 3, and a cable 4 that connects the magnetic field probe 2 and the external connection connector 3.

  Next, the operation at the time of magnetic field measurement of noise radio waves radiated from the device under test by the magnetic field distribution measuring apparatus having the above configuration will be described with reference to FIG.

  As shown to Fig.2 (a), the unevenness | corrugation exists in the surface of the to-be-measured apparatus 6 by various mounting components. Therefore, when the main body 1 of the magnetic field distribution measuring apparatus is pressed against the device under measurement 6, each magnetic field probe 2 expands and contracts along the unevenness of the surface of the device under measurement 6 as shown in FIG. 2 (b). The surface of the measuring device 6 and the tip of the magnetic field probe 2 are in close contact with each other, and the noise between the surface of the measuring device 6 and the tip of the magnetic field probe 2 is measured when measuring the magnetic field of the noise radio wave radiated from the device under measurement 6. The distance can be kept constant.

  FIG. 3 shows an embodiment of the expansion and contraction operation of the magnetic field probe 2. In this embodiment, the magnetic field probe 2 is expanded and contracted by the air damper 7 or the oil damper 8. That is, when the air damper 7 or the oil damper 8 is provided on the magnetic field probe 2 installed in the main body 1 and the main body 1 is pressed against the device 6 to be measured, the magnetic field is generated by the elasticity of the air damper 7 (or the oil damper 8). The probe 2 expands and contracts. A two-dot chain line indicates the magnetic field probe 2 and the air damper 7 (or the oil damper 8) when the main body 1 is pressed against the device 6 to be measured.

  FIG. 4 shows another embodiment of the expansion and contraction operation of the magnetic field probe 2. In this embodiment, the magnetic field probe 2 is expanded and contracted using a leaf spring 9. That is, when the leaf spring 9 is provided on the magnetic field probe 2 installed in the main body 1 and the main body 1 is pressed against the device 6 to be measured, the magnetic field probe 2 expands and contracts due to the elasticity of the leaf spring 9. The material of the leaf spring 9 is metal, plastic or the like. The two-dot chain line indicates the magnetic field probe 2 and the leaf spring 9 when the main body 1 is pressed against the device under measurement 6.

  Next, the magnetic field distribution measuring procedure using the magnetic field distribution measuring apparatus will be described more specifically with reference to FIG.

  As shown in FIG. 5 (a), the main body 1 of one magnetic field distribution measuring device is used to measure the magnetic field in a narrow range of the device 6 to be measured. As shown in FIG. 5 (b), n main bodies 1 are used. Can be connected to a plane to support a wide range of magnetic field measurements. Moreover, as shown in FIG.5 (c), it can also be combined with various shapes according to the desired range which makes the n main bodies 1 the object of magnetic field measurement.

  As shown in FIG. 6, the magnetic field probe 2 has a shield (magnetic shielding means) 2a formed on the inner side of the main body, and the tip 2c expands and contracts by a spring 2b inside the main body. With this configuration, when the main body 1 of the magnetic field distribution measuring device is pressed against the device under measurement 6, the tip 2c of the magnetic field probe 2 is contracted by the spring 2b as shown in FIG. And is housed inside the main body of the magnetic field probe 2. Thereby, even if the magnetic field probes 2 are installed at a narrow pitch, each measurement point is not affected by the magnetic field from adjacent points.

It is a see-through | perspective perspective view which shows one Embodiment of the magnetic field distribution measuring apparatus concerning this invention. FIGS. 2A and 2B are operation explanatory views of the magnetic field distribution measuring apparatus of FIG. 1, in which FIG. 1A shows a state before the magnetic field distribution measuring apparatus is pressed against the device to be measured, and FIG. Indicates pressed state. It is a figure which shows the expansion-contraction operation | movement of the magnetic field probe by an air damper or an oil damper in the magnetic field distribution measuring apparatus concerning this invention. It is a figure which shows the expansion-contraction operation | movement of the magnetic field probe by the leaf | plate spring in the magnetic field distribution measuring apparatus concerning this invention. It is a top view for demonstrating the measuring point by the magnetic field distribution measuring apparatus concerning this invention. It is operation | movement explanatory drawing of the magnetic field probe of the magnetic field distribution measuring apparatus concerning this invention, Comprising: (a) is the state before pressing a probe to a to-be-measured apparatus, (b) is the state which pressed the probe to to-be-measured apparatus. Indicates.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (Magnetic field distribution measuring apparatus) Main body 2 Magnetic field probe 2a Shield 2b Spring 2c Tip part 3 External connection connector 4 Cable 5 Coil spring 6 Device to be measured 7 Air damper 8 Oil damper 9 Leaf spring

Claims (5)

A magnetic field distribution measuring device for measuring a magnetic field of noise radio waves radiated from a device under test,
The body,
A magnetic field distribution measuring apparatus comprising: a plurality of magnetic field probes protruding from the main body.   2. The magnetic field distribution measuring apparatus according to claim 1, wherein each of the plurality of magnetic field probes can be expanded and contracted in an axial direction of each of the magnetic field probes.   The magnetic field distribution measuring apparatus according to claim 2, wherein each of the plurality of magnetic field probes can be expanded and contracted by an elastic expansion / contraction means in the axial direction of each of the magnetic field probes.   4. The magnetic field distribution measuring apparatus according to claim 1, wherein a plurality of the plurality of magnetic field probes are arranged vertically and horizontally on a mounting surface of the magnetic field probe of the main body.   Each of the plurality of magnetic field probes has a magnetic shielding means inside the main body of each magnetic field probe, and the distal end portion of each magnetic field probe expands and contracts. 5. The magnetic field distribution measuring apparatus according to claim 1, wherein the magnetic field distribution measuring apparatus is surrounded by the magnetic shielding means inside a probe main body.

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