JP2016006810A - Electromagnetic compatibility evaluation device and electromagnetic compatibility evaluation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic compatibility evaluation device capable of calculating appropriate solutions for the material, shape, thickness and fitting position of an electromagnetic noise countermeasure member in a configuration similar to an actual use state.SOLUTION: A first plate including a supporting surface is disposed on an evaluation target. A plurality of electromagnetic noise countermeasure adjustment plates are supported by the supporting surface. Each of the electromagnetic noise countermeasure adjustment plates includes: an electromagnetic noise countermeasure portion formed from a material which reflects or absorbs an electromagnetic wave; and a support portion which supports the electromagnetic noise countermeasure portion. The plurality of electromagnetic noise countermeasure adjustment plates are supported by the first plate to form an electromagnetic noise countermeasure region comprised of the electromagnetic noise countermeasure portions.

Description

  The present invention relates to an electromagnetic compatibility (hereinafter referred to as EMC) evaluation apparatus and an EMC evaluation method.

  Electronic devices are required to secure EMC. EMC includes the suppression of unintentional emission of electromagnetic waves (emissions) that adversely affect other devices, and the improvement of immunity to electromagnetic interference received from the outside. A phenomenon in which electromagnetic noise generated in one electronic device adversely affects other functions of the electronic device is called an intra system EMC.

  Patent Document 1 discloses an electromagnetic wave shielding performance measuring device. The electromagnetic wave shielding performance measuring device includes a transmitting antenna, a receiving antenna, and a radio wave absorbing wall. A material to be measured is disposed between the transmitting antenna and the receiving antenna. An electromagnetic wave absorbing wall surrounds the transmitting antenna in cooperation with the material to be measured, and another electromagnetic wave absorbing wall surrounds the receiving antenna in cooperation with the material to be measured. The electromagnetic wave shielding performance of the material to be measured can be measured by receiving the electromagnetic wave radiated from the transmitting antenna and transmitted through the material to be measured by the receiving antenna.

  Patent Document 2 discloses an electromagnetic field distribution measuring apparatus that takes into account temporal variations in measured values. In this electromagnetic field distribution measuring apparatus, a signal is detected while scanning a probe within a measurement surface in the vicinity of the object to be measured. Thereby, information on the electromagnetic field distribution in the measurement surface can be obtained.

  Patent Document 3 discloses a variable shield automatic control device. In this variable shield automatic control device, a plurality of radio wave absorber sheets having radio wave absorbers with a distributed structure are stacked, a part is fixed, and a part is a movable part. This makes the radio wave absorption characteristics variable with respect to frequency, position, or electric field strength. By automatically controlling the movement of the movable part of the radio wave absorber sheet, unnecessary electromagnetic radiation can be automatically suppressed.

JP 2011-122973 A International Publication No. 2006/075584 JP 2000-223882 A

  An electromagnetic shield plate or a radio wave absorbing sheet may be used for countermeasures against the EMC problem. For the electromagnetic shield plate, for example, a conductor such as metal is used. For the radio wave absorbing sheet, for example, a dielectric radio wave absorbing material, a magnetic radio wave absorbing material, or the like is used. The electromagnetic shield plate reflects electromagnetic waves, and the radio wave absorbing sheet absorbs electromagnetic waves. In this specification, the electromagnetic shielding plate and the radio wave absorbing sheet are referred to as “electromagnetic noise countermeasure member”.

  The effect of the electromagnetic noise countermeasure member attached to an electronic circuit component such as a printed circuit board depends on the material, shape, thickness, and mounting position of the electromagnetic noise countermeasure member. In order to obtain a sufficient effect of EMC countermeasures, it is desirable to appropriately select the material, shape, thickness, and mounting position of the electromagnetic noise countermeasure member.

  Using the electromagnetic shielding performance measuring apparatus disclosed in Patent Document 1, it is possible to estimate a suitable material and thickness of the electromagnetic noise countermeasure member.

  Using the electromagnetic field distribution measuring device disclosed in Patent Document 2, the electromagnetic field distribution in the vicinity of the electronic circuit component can be measured. From the measured electromagnetic field distribution, it is possible to estimate the position of the electromagnetic noise generation source, the noise propagation path, and the noise radiation portion (the conductive portion functioning as an antenna that radiates electromagnetic noise). The position of the electromagnetic noise generation source, the noise propagation path, and the noise radiation portion is useful information for determining the mounting position of the electromagnetic noise countermeasure member.

  It is desirable to confirm the effect of EMC countermeasures in the actual use state. For example, when measuring shielding performance using the electromagnetic shielding performance measuring device disclosed in Patent Document 1, various parameters characterizing electromagnetic waves, such as frequency, intensity, polarization state, mode (TE mode, TM mode, TEM) Mode), distance from the radiation source (near field, far field), etc., are preferably matched with those in actual use. However, in a shield performance measurement experiment, it is difficult to match these parameters with those in actual use.

  The near electromagnetic field distribution measured using the electromagnetic field distribution measuring apparatus disclosed in Patent Document 2 is not measured in an actual use state in which an electromagnetic noise countermeasure member is attached. The electromagnetic noise countermeasure member attached to the device under test may affect the noise source. Therefore, finally, it is preferable to evaluate the effect of the countermeasure against the EMC problem with the electromagnetic noise countermeasure member attached to the object to be measured. If a sufficient effect cannot be obtained with the electromagnetic noise countermeasure member attached, it is necessary to repeat trial and error while correcting the material, shape, thickness, attachment position, etc. of the electromagnetic noise countermeasure member.

  Further, in order to measure the electromagnetic field by bringing the probe close to the object to be measured, it is necessary to secure a space for arranging and moving the probe in the vicinity of the object to be measured. When the object to be measured is accommodated in the housing, an open portion must be provided in the housing in order to support and move the probe. When the influence of the open part provided on the housing on the radiation of electromagnetic waves cannot be ignored, it is difficult to measure the electromagnetic field in an environment close to actual use. Furthermore, the electromagnetic field around the probe may be disturbed by bringing the probe close to the object to be measured.

  An object of the present invention is to provide an electromagnetic compatibility evaluation apparatus and an electromagnetic compatibility evaluation method capable of obtaining a suitable solution of the material, shape, thickness, and mounting position of an electromagnetic noise countermeasure member with a configuration close to actual use. Is to provide.

According to one aspect of the invention,
A first plate having a support surface and disposed on the evaluation object;
A plurality of electromagnetic noise countermeasure adjustment plates supported by the support surface;
Each of the electromagnetic noise countermeasure adjustment plates includes an electromagnetic noise countermeasure portion formed of a material that reflects or absorbs electromagnetic waves, and a support portion that supports the electromagnetic noise countermeasure portion,
A plurality of the electromagnetic noise countermeasure adjustment plates are supported by the first plate, thereby providing an electromagnetic compatibility evaluation apparatus configured to form an electromagnetic noise countermeasure area including the electromagnetic noise countermeasure portion. The

The first plate is disposed on the evaluation object, and the electromagnetic noise countermeasure adjusting plate is supported by the first plate. By adjusting the arrangement of the electromagnetic noise countermeasure adjusting plate, the shape of the region defined by the electromagnetic noise countermeasure portion can be changed. The EMC can be evaluated by changing the shape of the region defined by the electromagnetic noise countermeasure portion. Further, when performing EMC evaluation with the evaluation object accommodated in the casing, the casing is provided with a space for disposing the first plate and the electromagnetic noise countermeasure adjusting plate in the casing, and measures against electromagnetic noise. It is only necessary to provide an opening having a size necessary for inserting the adjusting plate. For this reason, it is possible to evaluate EMC by a use structure in an actual use state.

  Furthermore, it is good also as a structure which has several protrusion provided in the said support surface. In this case, the position of the electromagnetic noise countermeasure adjusting plate is constrained in one direction parallel to the support surface when the electromagnetic noise countermeasure adjusting plate in contact with the support surface contacts the protrusion.

  Furthermore, it is good also as a structure which has a 2nd plate which leaves | separates from the said support surface and opposes the said support surface. The protrusion functions as a spacer that adjusts the distance between the first plate and the second plate. The electromagnetic noise countermeasure adjusting plate is inserted between the first plate and the second plate. Thereby, the electromagnetic noise countermeasure adjusting plate can be stably supported.

  The first plate and the second plate are preferably transparent. By making the first plate and the second plate transparent, it is possible to visually recognize the arrangement of components mounted on the surface of the evaluation object and the wiring pattern.

  The electromagnetic noise countermeasure adjustment plate has a plate-like shape that is long in one direction, and the electromagnetic noise countermeasure adjustment plate is supported by the one end of the electromagnetic noise countermeasure adjustment plate with the support surface. It is good also as a structure which is arrange | positioned on a surface and the other edge part is located outside the edge of a said 1st plate. The arrangement of the electromagnetic noise countermeasure adjusting plate can be adjusted by holding the end located outside the edge of the first plate.

  The electromagnetic noise countermeasure adjusting plate may have a scale that is configured to confirm the depth of insertion from the edge of the first plate to the inside. By visually checking the scale, the insertion depth of the electromagnetic noise countermeasure adjusting plate can be easily confirmed.

  Further, the electromagnetic noise countermeasure adjustment plate formed by the electromagnetic noise countermeasure adjustment portion of the electromagnetic noise countermeasure adjustment plate holding the electromagnetic noise countermeasure adjustment plate and transferring it to the support surface, It is good also as a structure which has a control apparatus which controls the said transfer mechanism so that it may become a shape which carries out. By adopting this configuration, the EMC can be automatically evaluated.

According to another aspect of the invention,
Disposing a first plate having a support surface on the evaluation object;
Supporting a plurality of electromagnetic noise countermeasure adjustment plates on the support surface, each including an electromagnetic noise countermeasure part formed of a material that reflects or absorbs electromagnetic waves and a support part that supports the electromagnetic noise countermeasure part; ,
There is provided an electromagnetic compatibility evaluation method including a step of evaluating electromagnetic compatibility of the evaluation object in a state where a plurality of electromagnetic noise countermeasure adjustment plates are supported by the support surface.

By adjusting the arrangement of the electromagnetic noise countermeasure adjusting plate, the shape of the region defined by the electromagnetic noise countermeasure portion can be changed. The EMC can be evaluated by changing the shape of the region defined by the electromagnetic noise countermeasure portion. Further, when performing EMC evaluation with the evaluation object accommodated in the casing, the casing is provided with a space for arranging the first plate and the electromagnetic noise countermeasure adjustment plate in the casing, and measures against electromagnetic noise. It is only necessary to provide an opening having a size necessary for inserting the adjusting plate. For this reason, it is possible to evaluate EMC by a use structure in an actual use state.

  The support surface may have a plurality of protrusions. In the step of supporting the plurality of electromagnetic noise countermeasure adjustment plates on the support surface, the electromagnetic noise countermeasure adjustment plates supported on the support surface are brought into contact with the protrusions, thereby being related to one direction parallel to the support surface. The position of the electromagnetic noise countermeasure adjusting plate can be constrained.

  The second plate may be configured to face the support surface away from the support surface. The protrusion functions as a spacer that adjusts the distance between the first plate and the second plate. In the step of supporting the plurality of electromagnetic noise countermeasure adjustment plates on the support surface, the electromagnetic noise countermeasure adjustment plates are inserted between the first plate and the second plate. Thereby, the electromagnetic noise countermeasure adjusting plate can be stably supported.

  The first plate is disposed on the evaluation object, and the electromagnetic noise countermeasure adjusting plate is supported by the first plate. By adjusting the arrangement of the electromagnetic noise countermeasure adjusting plate, the shape of the region defined by the electromagnetic noise countermeasure portion can be changed. The EMC can be evaluated by changing the shape of the region defined by the electromagnetic noise countermeasure portion. Further, when performing EMC evaluation with the evaluation object accommodated in the casing, the casing is provided with a space for disposing the first plate and the electromagnetic noise countermeasure adjusting plate in the casing, and measures against electromagnetic noise. It is only necessary to provide an opening having a size necessary for inserting the adjusting plate. For this reason, it is possible to evaluate EMC by a use structure in an actual use state.

FIG. 1 is a perspective view of the EMC evaluation apparatus according to the first embodiment. 2A is a schematic diagram of an electronic device that performs EMC evaluation, FIG. 2B is a schematic diagram of a state in which a casing of the electronic device is opened, and FIG. 2C is a test of the electronic device that actually performs EMC evaluation. It is a disassembled perspective view of goods. FIG. 3A and FIG. 3B are an exploded perspective view and a perspective view, respectively, of a test product incorporating the EMC evaluation apparatus. FIG. 4 is a schematic diagram of the entire apparatus for measuring emissions. 5A and 5B are a plan view and a cross-sectional view of the entire apparatus for measuring immunity, respectively. FIG. 6 is a block diagram of an electronic device for explaining the intra system EMC. FIG. 7 is a perspective view of the EMC evaluation apparatus according to the second embodiment. FIG. 8 is a perspective view of the EMC evaluation apparatus according to the third embodiment. FIG. 9 is a schematic diagram of an EMC evaluation apparatus according to the fourth embodiment.

[Example 1]
FIG. 1 is a perspective view of an EMC evaluation apparatus 10 according to the first embodiment. The EMC evaluation apparatus 10 includes a first plate 11 and a plurality of electromagnetic noise countermeasure adjustment plates 12. The first plate 11 is used by being disposed on an evaluation object, for example, a printed board. The upper surface of the first plate 11 acts as a support surface for supporting the plurality of electromagnetic noise countermeasure adjustment plates 12.

The first plate 11 is preferably made of a material that does not significantly affect the propagation of electromagnetic waves, such as polyethylene, polystyrene, polytetrafluoroethylene, or the like. In addition to these materials, a material having a relative permittivity between 1 and 3 and a relative permeability between 0.99 and 1.01 may be used. Furthermore, the first plate 11 is preferably transparent. First
When the plate 11 is transparent, the components mounted on the printed circuit board and the wiring pattern formed on the printed circuit board can be viewed with the first plate 11 placed on the printed circuit board. . Examples of the transparent material include polyethylene and polystyrene.

  The electromagnetic noise countermeasure adjusting plate 12 includes a plate-like (for example, rectangular) support portion 13 that is long in one direction, and an electromagnetic noise countermeasure portion 14 that is disposed in a part of the support portion 13. Similar to the first plate 11, the support portion 13 is formed of a material that does not significantly affect the propagation of electromagnetic waves. The width of the support portion 13 is the same in all the electromagnetic noise countermeasure adjustment plates 12. A scale 15 is attached to the support portion 13 along its length direction. The electromagnetic noise countermeasure portion 14 may be attached to the surface of the support portion 13 or may be embedded in the support portion 13.

  A plurality of electromagnetic noise countermeasure adjusting plates 12 having different materials, shapes, sizes, thicknesses, and arrangements of the electromagnetic noise countermeasure portions 14 are prepared. The electromagnetic noise countermeasure portion 14 is made of a material that reflects or absorbs electromagnetic waves. Examples of the electromagnetic noise countermeasure portion 14 that reflects electromagnetic waves include a metal plate, a metal mesh, and a foam metal. Examples of the material that absorbs electromagnetic waves include conductive wave absorbing materials, dielectric wave absorbing materials, and magnetic wave absorbing materials.

  The shape of the electromagnetic noise countermeasure portion 14 is, for example, a square or a rectangle. In addition, you may prepare the electromagnetic noise countermeasure adjustment board 12 with the electromagnetic noise countermeasure part 14 which has another shape. Further, the electromagnetic noise countermeasure portions 14 may be arranged at a plurality of locations of the support portion 13. Regarding the width direction of the support portion 13, the size of the electromagnetic noise countermeasure portion 14 may be equal to the size of the support portion 13 or may be smaller than the size of the support portion 13.

  By arranging a plurality of electromagnetic noise countermeasure adjusting plates 12 in the width direction on the support surface of the first plate 11, an electromagnetic noise countermeasure area having various patterns composed of the electromagnetic noise countermeasure portions 14 can be formed. . By shifting the electromagnetic noise countermeasure adjustment plate 12 in the length direction, the shape of the electromagnetic noise countermeasure area can be changed. When the dimension of the electromagnetic noise countermeasure portion 14 is equal to the dimension of the support portion 13 with respect to the width direction of the support portion 13, an electromagnetic noise countermeasure region in which the electromagnetic noise countermeasure portion 14 is substantially continuous in the width direction can be formed.

  FIG. 2A shows a schematic diagram of an electronic device 20 that performs EMC evaluation. The electronic device 20 includes an evaluation object 21 such as a printed circuit board and a housing 22 that houses the evaluation object 21. As shown in FIG. 2B, the housing 22 includes a lower housing 23 whose upper side is opened, and an upper housing 24 that closes an open portion of the lower housing 23. An evaluation object 21 is attached to the bottom surface of the lower housing 23.

  FIG. 2C shows an exploded perspective view of the specimen 30 of the electronic device 20 that actually performs EMC evaluation. Similarly to the electronic device 20, the sample 30 includes a lower housing 23, an upper housing 24, and an evaluation object 21. In the sample 30, an opening 25 is provided on the side surface of the lower housing 23.

  FIGS. 3A and 3B show an exploded perspective view and a perspective view of the specimen 30 in which the EMC evaluation apparatus 10 is incorporated, respectively. The first plate 11 is disposed on the evaluation object 21. The first plate 11 is temporarily fixed to the surface of the evaluation object 21 with, for example, a double-sided tape. A plurality of electromagnetic noise countermeasure adjustment plates 12 are inserted into the housing 22 through the opening 25. One end portion of the electromagnetic noise countermeasure adjusting plate 12 is disposed on the support surface of the first plate 11, and the other end portion is located outside the edge of the first plate 11. A portion of the electromagnetic noise countermeasure adjustment plate 12 inserted into the housing 22 is in contact with the support surface of the first plate 11 and is supported on the support surface. The first plate 11 prevents contact between the electromagnetic noise countermeasure adjustment plate 12 and the evaluation object 21.

  A plurality of electromagnetic noise countermeasure portions 14 are arranged on the evaluation object 21. A plurality of electromagnetic noise countermeasure portions 14 define an electromagnetic noise countermeasure area having a certain pattern. When the first plate 11 is transparent, the component mounted on the evaluation object 21 and the wiring pattern formed on the evaluation object 21 are visually recognized with the housing 22 opened. The electromagnetic noise countermeasure portion 14 can be disposed at a target position.

  Since the scale 15 is attached | subjected to the support part 13, the insertion depth of the electromagnetic noise countermeasure adjustment plate 12 can be confirmed easily. Even when the first plate 11 is not transparent or the housing 22 is closed, the electromagnetic noise countermeasure portion 14 can be disposed at the target position while checking the scale 15.

  FIG. 4 shows a schematic diagram of the entire apparatus for measuring emissions. The emission measurement is performed in the anechoic chamber 33. The specimen 30 and the receiving antenna 34 incorporating the EMC evaluation apparatus 10 are arranged in the anechoic chamber 33, and the electromagnetic wave radiated from the specimen 30 is received by the receiving antenna 34. Emission can be evaluated by analyzing the signal received by the receiving antenna 34 by the inspection device 35.

  5A and 5B are a plan view and a cross-sectional view of the entire apparatus for measuring immunity, respectively. A test table 41 is placed on the reference ground plate 40, and a horizontal coupling plate 42 is placed thereon. On the horizontal coupling plate 42, the sample 30 and the vertical coupling plate 44 are placed via an insulating sheet 43. The horizontal coupling plate 42 and the vertical coupling plate 44 are connected to the reference ground plate 40 via discharge resistors 45 and 46, respectively.

  Electrostatic discharge is generated between the electrostatic discharge generator 47 and the horizontal coupling plate 42, between the electrostatic discharge generator 47 and the vertical coupling plate 44, and between the electrostatic discharge generator 47 and the sample 30. Immunity can be evaluated by measuring the influence of electrostatic discharge on the operation of the specimen 30.

Next, a measurement method of the intra system EMC will be described with reference to FIG.
FIG. 6 shows a block diagram of the electronic device 20. An evaluation object 21 (printed circuit board), a transmission / reception antenna 64, a broadcast wave reception antenna 65, a power supply unit 66, a display device 67, and a camera unit 68 are accommodated in the housing 22 (FIG. 3B). A CPU 60, a memory 61, a logic circuit 62, and a high frequency circuit 63 are mounted on the evaluation object 21. The CPU 60 and the display device 67 and the CPU 60 and the camera unit 68 are connected by the wiring 27. The transmission / reception antenna 64 transmits and receives radio signals to and from the base station antenna 70. The broadcast wave receiving antenna 65 receives the broadcast wave radiated from the broadcast antenna 71.

  When noise generated from the wiring 27 is received by the broadcast wave receiving antenna 65, the image is disturbed. When noise generated from the wiring 27 is received by the transmission / reception antenna 64, the call quality deteriorates. On the contrary, when the radio wave transmitted from the transmission / reception antenna 64 is received by the camera unit 68, the screen flickers.

  The intra system EMC can be evaluated by operating the EUT 30 (FIG. 3B) incorporating the EMC evaluation apparatus 10 and measuring image disturbance, screen flicker, call quality degradation, and the like.

By changing the type and arrangement of the electromagnetic noise countermeasure adjusting plate 12 (FIG. 1) incorporated in the specimen 30, EMC can be evaluated for various shapes of electromagnetic noise countermeasure regions. By using a material having a dielectric constant and permeability close to the dielectric constant and permeability of air for the first plate 11 and the support portion 13 (FIG. 3A), the difference between the measurement conditions and the actual use state is reduced. can do.

  Moreover, in Example 1, the opening part 25 (FIG. 3B) required in order to insert the electromagnetic noise countermeasure adjustment board 12 should just be formed in the housing | casing 22 of the EUT 30 used as the evaluation object of EMC. Furthermore, a thin space necessary for arranging the first plate 11 and the electromagnetic noise countermeasure adjusting plate 12 may be secured above the evaluation object 21, and a large space for scanning a probe or the like is secured. There is no need to keep it. Since the configuration of the EUT 30 is similar to the configuration of the actual electronic device 20 (FIG. 2A), the EUT 30 incorporating the EMC evaluation apparatus 10 is used as a measurement object, which is close to the actual use state. It is possible to perform EMC measurement in the state.

  By performing EMC measurement while changing the material, shape, thickness, and arrangement of the electromagnetic noise countermeasure area, it is possible to find a desirable material, shape, thickness, and arrangement of the electromagnetic noise countermeasure area. In Example 1, since the EMC evaluation is performed in a state close to the actual use state, the desirable material, shape, thickness, and arrangement of the electromagnetic noise countermeasure region found using the test sample 30 are actually used as they are. It can be applied to the electronic device 20 (FIG. 2A).

[Example 2]
In FIG. 7, the perspective view of the EMC evaluation apparatus 10 by Example 2 is shown. Hereinafter, differences from the first embodiment shown in FIG. 1 will be described, and description of the same configuration will be omitted.

  In the EMC evaluation apparatus 10 according to the second embodiment, a plurality of protrusion rows 17 are provided on the support surface of the first plate 11. Each of the protrusion rows 17 includes a plurality of protrusions 16 arranged in a direction parallel to the length direction of the electromagnetic noise countermeasure adjustment plate 12 supported by the first plate 11. The interval between the protrusion rows 17 is equal to the width of the electromagnetic noise countermeasure adjustment plate 12. The electromagnetic noise countermeasure adjustment plate 12 can be inserted between the protrusion rows 17.

  By the projection row 17, the position of the electromagnetic noise countermeasure adjustment plate 12 is restricted in the width direction. Thereby, the electromagnetic noise countermeasure adjusting plate 12 can be easily positioned on the support surface of the first plate 11.

[Example 3]
FIG. 8 is a perspective view of the EMC evaluation apparatus 10 according to the third embodiment. Hereinafter, differences from the second embodiment shown in FIG. 7 will be described, and description of the same configuration will be omitted.

  The EMC evaluation apparatus 10 according to the third embodiment includes a second plate 18 in addition to the first plate 11. The second plate 18 is disposed away from the support surface of the first plate 11 and faces the support surface. The second plate 18 is made of the same material as the first plate 11. The protrusion 16 provided on the support surface functions as a spacer that adjusts the distance between the first plate 11 and the second plate 18. The electromagnetic noise countermeasure adjusting plate 12 is inserted between the first plate 11 and the second plate 18.

  In the third embodiment, the position of the electromagnetic noise countermeasure adjusting plate 12 is also restricted in the thickness direction by the first plate 11 and the second plate 18. Thereby, the stability of the position of the electromagnetic noise countermeasure adjustment plate 12 can be enhanced.

[Example 4]
In FIG. 9, the schematic of the EMC evaluation apparatus by Example 4 is shown. A plurality of electromagnetic noise countermeasure adjustment plates 12 are stored in the storage 80. The transfer mechanism 73 transfers the electromagnetic noise countermeasure adjusting plate 12 stored in the storage 80 to the sample 30 and arranges it at a target position in the sample 30. In addition, the transfer mechanism 73 returns the electromagnetic noise countermeasure adjustment plate 12 arranged in the sample 30 to the storage 80.

  The transfer mechanism 73 includes an arm 74 and an arm driving unit 75. The arm 74 grips and holds the electromagnetic noise countermeasure adjusting plate 12. When the arm drive unit 75 moves the arm 74, the electromagnetic noise countermeasure adjustment plate 12 is moved from the storage box 80 to the specimen 30 or vice versa.

  The transfer mechanism 73 is controlled by the control device 76. The control device 76 includes a display device 77, an input device 78, a storage device 79, and the like. The storage device 79 stores a plurality of pieces of shape data of the electromagnetic noise countermeasure area to be subjected to EMC evaluation, data on the material of the electromagnetic noise countermeasure portion, thickness data, and the like. These data are input by the operator through the input device 78.

  Next, the EMC evaluation method will be described. The control device 76 controls the transfer mechanism 73 based on the data regarding the electromagnetic noise countermeasure area stored in the storage device 79. Thereby, the transfer mechanism 73 selects an appropriate electromagnetic noise countermeasure adjustment plate 12, transfers it from the storage 80 to the specimen 30, and arranges it in the specimen 30. When the arrangement of the electromagnetic noise countermeasure adjustment plate 12 is completed, the control device 76 issues a measurement start command to the EMC measuring device 83.

  For the EMC measuring device 83, for example, the devices shown in FIGS. 4 to 6 are used. When the measurement is completed, the EMC measurement result is sent from the EMC measurement device 83 to the control device 76. The control device 76 stores the EMC measurement result in the storage device 79. Further, the EMC measurement result is displayed on the display device 77 in association with the shape, material, and thickness of the electromagnetic noise countermeasure area in accordance with an instruction from the operator. The information displayed on the display device 77 is useful information for determining the shape, material, and thickness of the electromagnetic noise countermeasure region to be employed in the electronic device 20 (FIG. 2A).

  In the fourth embodiment, the EMC evaluation can be automatically performed by inputting data such as the shape of the electromagnetic noise countermeasure area into the control device 76.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

DESCRIPTION OF SYMBOLS 10 EMC evaluation apparatus 11 1st plate 12 Electromagnetic noise countermeasure adjustment board 13 Support part 14 Electromagnetic noise countermeasure part 15 Scale 16 Protrusion 17 Protrusion row | line | column 2 2nd plate 20 Electronic device 21 Evaluation object 22 Case 23 Lower case 24 Upper casing 25 Opening 27 Wiring 30 Specimen 33 Anechoic chamber 34 Receiving antenna 35 Inspection device 40 Reference ground plate 41 Test table 42 Horizontal coupling plate 43 Insulating sheet 44 Vertical coupling plates 45 and 46 Discharge resistance 47 Electrostatic discharge generator 60 CPU
61 Memory 62 Logic circuit 63 High-frequency circuit 64 Transmit / receive antenna 65 Broadcast wave receiving antenna 66 Power supply unit 67 Display device 68 Camera unit 70 Base station antenna 71 Broadcast antenna 73 Transfer mechanism 74 Arm 75 Arm drive unit 76 Control device 77 Display device 78 Input Device 79 Storage device 80 Storage 83 EMC measuring device

Claims (10)

A first plate having a support surface and disposed on the evaluation object;
A plurality of electromagnetic noise countermeasure adjustment plates supported by the support surface;
Each of the electromagnetic noise countermeasure adjustment plates includes an electromagnetic noise countermeasure portion formed of a material that reflects or absorbs electromagnetic waves, and a support portion that supports the electromagnetic noise countermeasure portion,
A plurality of the electromagnetic noise countermeasure adjustment plates are supported by the first plate, and are configured to form an electromagnetic noise countermeasure area including the electromagnetic noise countermeasure portion. Furthermore, it has a plurality of protrusions provided on the support surface,
The electromagnetic noise countermeasure adjusting plate according to claim 1, wherein the electromagnetic noise countermeasure adjusting plate is constrained in one direction parallel to the supporting surface by the electromagnetic noise countermeasure adjusting plate contacting the support surface contacting the protrusion. Compatibility evaluation device. Furthermore, it has a second plate facing the support surface away from the support surface, and the protrusion functions as a spacer for adjusting the distance between the first plate and the second plate,
The electromagnetic compatibility evaluation apparatus according to claim 2, wherein the electromagnetic noise countermeasure adjustment plate is inserted between the first plate and the second plate.   The electromagnetic compatibility evaluation apparatus according to claim 3, wherein the first plate and the second plate are transparent.   The electromagnetic noise countermeasure adjustment plate has a plate shape that is long in one direction, and the one end of the electromagnetic noise countermeasure adjustment plate is supported by the support surface with the electromagnetic noise countermeasure adjustment plate supported by the support surface. The electromagnetic compatibility evaluation apparatus according to any one of claims 1 to 4, wherein the electromagnetic compatibility evaluation apparatus is disposed on a surface, and the other end portion is located outside an edge of the first plate.   The electromagnetic compatibility evaluation apparatus according to claim 5, wherein the electromagnetic noise countermeasure adjusting plate is provided with a scale configured to confirm a depth of insertion from the edge of the first plate to the inside. further,
A transfer mechanism that holds the electromagnetic noise countermeasure adjustment plate and transfers it to the support surface;
The control apparatus which controls the said transfer mechanism so that the said electromagnetic noise countermeasure area | region formed by the said electromagnetic noise countermeasure part of the said electromagnetic noise countermeasure adjustment plate may become a target shape. The electromagnetic compatibility evaluation apparatus according to item 1. Disposing a first plate having a support surface on the evaluation object;
Supporting a plurality of electromagnetic noise countermeasure adjustment plates on the support surface, each including an electromagnetic noise countermeasure part formed of a material that reflects or absorbs electromagnetic waves and a support part that supports the electromagnetic noise countermeasure part; ,
A method for evaluating electromagnetic compatibility of the evaluation object in a state where a plurality of electromagnetic noise countermeasure adjustment plates are supported by the support surface. A plurality of protrusions are provided on the support surface,
In the step of supporting the plurality of electromagnetic noise countermeasure adjustment plates on the support surface, the electromagnetic noise countermeasure adjustment plates supported on the support surface are brought into contact with the protrusions, thereby being related to one direction parallel to the support surface. The electromagnetic compatibility evaluation method according to claim 8, wherein the position of the electromagnetic noise countermeasure adjustment plate is constrained. A second plate is opposed to the support surface away from the support surface, and the protrusion functions as a spacer for adjusting a distance between the first plate and the second plate;
The step of supporting a plurality of the electromagnetic noise countermeasure adjustment plates on the support surface, the electromagnetic noise countermeasure adjustment plates are inserted between the first plate and the second plate. Electromagnetic compatibility evaluation method.

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