JP5212653B2 - Electromagnetic wave low reflection table for specimen - Google Patents

Description

  The present invention relates to an electromagnetic wave low reflector for a specimen used for mounting a specimen equipment in, for example, EMI measurement or immunity test.

  Various electronic devices have come to be widely used, and the effects of these electronic devices due to electromagnetic waves and the influence of electromagnetic waves radiated by the electronic devices themselves on other electronic devices have become problems. Measurement of electromagnetic noise generated from electronic equipment (EMI measurement, EMI: Electromagnetic Interference) is performed at an outdoor test site or an anechoic chamber, and the resistance test (immunity test) of the electronic equipment against electromagnetic noise radiated from the outside is a radio wave. It is done in a dark room.

  In electromagnetic noise measurement (EMI measurement), when the EUT (Equipment Under Test) such as an electronic device is a desktop device, place the EUT on the specimen desk. Measures electromagnetic noise. However, in the conventional specimen desk made of wood or glass fiber reinforced plastics, especially when measuring electromagnetic noise with a frequency of 200 MHz or more, the reflection of electromagnetic waves on the specimen desk affects the measurement results. This is one of the causes of uncertainty in the measurement results.

In response to such a problem, the following Patent Document 1 states that “the top plate portion is composed of a laminated body in which an insulating layer having a thickness of 5 mm or less is laminated on top and bottom of an insulator made of a honeycomb or foam. "Reflector" ([Solution] in [Summary]) is disclosed. More specifically, in Example 1 of Patent Document 1, a paper honeycomb material having a density of 31 kg / m ³ using kraft paper having a thickness of 38 mm and a parallel side interval of the honeycomb of 9 mm (manufactured by Showa Aircraft Industry Co., Ltd.) The size of the top plate formed by using fiber reinforced plastics made of polyester resin with the legs having a cross section of 100 mm x 100 mm laminated on both sides of Papicore 9-G-30) Shows a low electromagnetic wave reflector having a height of 1000 mm and a width of 1500 mm and a height of 800 mm (paragraph [0013]). Here, when FIG. 1 of patent document 1 is seen, it turns out that a leg exists only in the four corners of a top plate. The “load capacity of the top plate” is “100 kg or more” (same paragraph), but the load capacity as a desk is not shown.

JP 7-270468 A

  The top plate as described in the above-mentioned Patent Document 1 “consists of a laminated body in which the upper and lower sides of an insulator made of honeycomb or foam are laminated with insulating layers having a thickness of 5 mm or less” is easy to bend, and generally electromagnetic waves The EUT, which is the target of noise measurement, is placed near the center of the desk top. Therefore, it is considered that it is difficult to increase the load resistance as a specimen desk with a structure in which the legs are only at the four corners of the top plate as in the electromagnetic wave low reflection desk of Patent Document 1. Furthermore, the electromagnetic wave low reflection desk of Patent Document 1 has legs made of “fiber reinforced plastics made of polyester resin”, and no consideration is given to the reflection of electromagnetic waves on the legs.

  The present invention has been made in recognition of such a situation, and the purpose of the present invention is conventionally used by constructing both the top plate and the legs with a material that reflects less electromagnetic waves than wood or glass fiber reinforced plastics. Compared with wooden and glass fiber reinforced plastic test specimen desks, it can suppress the reflection of electromagnetic waves from the test specimen desk and optimize the connection structure between the top and legs. Thus, an electromagnetic wave low reflection desk for a test piece that can increase the load bearing performance as a test piece desk as compared with a structure in which the legs are only at the four corners of the top plate as in the electromagnetic wave low reflection desk of Patent Document 1. It is to provide.

An aspect of the present invention is an electromagnetic wave low reflection desk for a specimen,
A top plate and first to third legs,
Each of the top plate and the first to third leg portions is obtained by laminating and integrating resin plates on both surfaces of the foam plate,
The first and second leg portions are opposed to each other, and the third leg portion is provided so as to pass the first and second leg portions and is connected to the first and second leg portions. The top plate is placed on the upper edge of the first to third leg portions and connected to the first to third leg portions.

  In an electromagnetic wave low reflection desk for a specimen according to an aspect, an adhesive layer may be interposed between the foam plate and the resin plate.

  In the electromagnetic wave low reflector for a specimen according to a certain aspect, it is preferable that the upper edge of the first to third leg portions has an H-shaped contact portion with the top plate.

In an electromagnetic wave low reflector for a specimen of an embodiment,
A first reinforcing plate and a second reinforcing plate, which are laminated and integrated with resin plates on both sides of the foam plate;
The first and second reinforcing plates are provided to pass the first and second legs, respectively, and are connected to the first and second legs,
The first and second reinforcing plates are shorter than the first to third leg portions in the height direction, and are opposed to each other so that the third leg portion is located therebetween. Good.

  Furthermore, the upper edges of the first and second reinforcing plates may be in contact with the top plate.

  In the electromagnetic wave low reflection desk for a specimen according to a certain aspect, it is preferable that a middle portion of a lower edge of the third leg portion is partially cut out.

  In an electromagnetic wave low reflection desk for a specimen according to an aspect, a middle portion of an upper edge of the third leg portion is partially a notch portion, and a portion of the top plate located above the notch portion is It should be open.

  In the electromagnetic wave low reflection desk for a specimen according to a certain aspect, a plurality of the resin plates of the top plate, which are laminated and integrated on the top surface of the foam plate, are divided with respect to at least one of the width direction and the depth direction. It is good to consist of a resin plate division piece.

  In the electromagnetic wave low reflection desk for a test piece of a certain aspect, it is preferable that the surface of the resin plate of the top plate that is laminated and integrated on the upper surface of the foam plate is subjected to heat treatment.

  In an electromagnetic wave low reflection desk for a specimen of a certain aspect, the resin plate may be made of a vinyl chloride plate having a thickness of 1 mm, and the foam plate may be made of an extruded styrene foam having a thickness of 37 mm.

In an electromagnetic wave low reflector for a specimen of an embodiment,
A part of the lower edge of the first and second legs is a notch, and a caster is attached to each notch,
The lower ends of the first to third legs may be positioned above the lower ends of the casters by a predetermined length that is smaller than the length of the casters in the height direction.

  In this case, the predetermined length may be 5 mm to 15 mm.

  The electromagnetic wave low reflector for a specimen of a certain aspect may have a load bearing performance that satisfies test category 4 of the main work surface in a vertical force test based on JIS S 1205: 1998.

  In the case of the electromagnetic wave low reflector for the specimen in a certain aspect, when the electromagnetic wave reflector for the specimen measured in the frequency range of 200 MHz to 1 GHz in accordance with 5.9.2 of CISPR16-1-4 Second edition is installed. The reception voltage may be within a range of ± 1 dB with respect to the reception voltage when the electromagnetic wave low reflector for the specimen is not installed by at least one of the 10 m method and the 3 m method.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the electromagnetic wave low reflection desk for a specimen of the present invention, the top plate and the first to third legs are each formed by laminating and integrating the resin plates on both surfaces of the foam plate. The reflection of electromagnetic waves from the specimen desk can be suppressed as compared with the specimen desk made of wood or glass fiber reinforced plastic. The first and second legs are opposed to each other, and the third leg is provided so as to pass the first and second legs, and the first and second legs are connected to the first and second legs. Since the top plate is mounted on the upper edge of the first to third legs and connected to the first to third legs, it is like the electromagnetic wave low reflector of Patent Document 1. Compared with the structure in which the legs are only at the four corners of the top plate, it is possible to enhance the load bearing performance as a desk for the specimen.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the electromagnetic wave low reflective machine for test bodies which concerns on the 1st Embodiment of this invention, (A) is front sectional drawing (AA 'sectional drawing of the same figure (B)), (B) is Sectional drawing seen from the bottom (BB 'sectional drawing of the figure (A)). The schematic perspective view of the electromagnetic wave low reflective desk for the specimen. It is a block diagram of the electromagnetic wave low reflection machine for test bodies concerning the 2nd Embodiment of this invention, (A) is a front sectional view (AA 'sectional drawing of the same figure (B)), (B) is Sectional drawing seen from the bottom (BB 'sectional drawing of the figure (A)). The front sectional view of the electromagnetic wave low reflector for a specimen concerning a 3rd embodiment of the present invention. It is a block diagram of the electromagnetic wave low reflective machine for test bodies concerning the 4th Embodiment of this invention, (A) is a front sectional view (AA 'sectional drawing of the same figure (B)), (B) is Bottom view. The bottom view of the electromagnetic wave low reflective machine for test bodies which concerns on the 5th Embodiment of this invention. The bottom view of the electromagnetic wave low reflective desk for test bodies which concerns on the 6th Embodiment of this invention. It is a block diagram of the electromagnetic wave low reflective table for test bodies concerning the 7th Embodiment of this invention, (A) is a top view, (B) is a front sectional view (BB 'cross section of the same figure (A)) Figure). The bottom view of the electromagnetic wave low reflective desk for test bodies which concerns on the 8th Embodiment of this invention. The top view of the electromagnetic wave low reflective desk for test bodies which concerns on the 9th Embodiment of this invention. The top view of the electromagnetic wave low reflective desk for test bodies which concerns on the 10th Embodiment of this invention. It is a block diagram of the electromagnetic wave low reflection machine for test bodies concerning the 11th Embodiment of this invention, (A) is a front sectional view (AA 'sectional drawing of the same figure (B)), (B) is Sectional drawing seen from the bottom (BB 'sectional drawing of the figure (A)). It is a block diagram of the electromagnetic wave low reflective desk for test bodies which concerns on the 12th Embodiment of this invention, (A) is a right view, (B) is a bottom view. The partial enlarged view at the time of attaching C channel to the installation position of a caster in the embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the electromagnetic wave low reflective desk for test bodies which concerns on the Example of this invention, (A) is a front view, (B) is a right view. It is the same configuration diagram, (A) is a bottom view, (B) is a plan view. The characteristic view which shows the receiving voltage difference (10m method) calculated | required about each of the electromagnetic wave low reflection machine for test bodies of the same Example, a foam material desk, and the conventional wooden desk compared with the case where there is no test piece desk. The characteristic view which shows the received voltage difference (3m method). Explanatory drawing which showed the maximum receiving voltage difference of + side and-side in the frequency range 200MHz-1GHz of FIG.17 and FIG.18 about each desk. Maximum received voltage on the + side and-side in the same frequency range when the deviation of the setup table (specimen table) is measured in the 3m method in the frequency range of 1 to 6 GHz according to “CISPR / A / 774 / CD” Explanatory drawing which showed the difference about each desk.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(First embodiment)
FIG. 1 is a configuration diagram of an electromagnetic wave low reflection table 100 for a specimen according to a first embodiment of the present invention, in which (A) is a front sectional view (AA ′ sectional view of FIG. 1 (B)). ) And (B) are cross-sectional views (a cross-sectional view taken along the line BB 'in FIG. 1 (A)) viewed from below. FIG. 2 is a schematic perspective view of the electromagnetic wave low reflector 100 for the specimen.

  The test object low-electromagnetic wave reflector 100 includes a first leg 10, a second leg 20, a third leg 30, and a top plate 50. The first leg portion 10 is obtained by laminating and integrating resin plates 12 and 13 on both surfaces of a foam plate 11. Similarly, the second leg portion 20 is formed by laminating and integrating resin plates 22 and 23 on both surfaces of the foam plate 21. Similarly, the third leg 30 is obtained by laminating and integrating resin plates 32 and 33 on both surfaces of the foam plate 31. Similarly, the top plate 50 is obtained by laminating and integrating resin plates 52 and 53 on both surfaces of the foam plate 51. Preferably, the lamination integration is performed via an adhesive layer (not shown) (an adhesive layer (not shown) is interposed between the foam plate and the resin plate). For example, an adhesive layer made of a polyol adhesive can be used.

  Extruded styrene foam is suitable as a material for the foam plate, but other foams having a relative dielectric constant similar to that of extruded styrene foam (1.0 to 1.1) in the frequency range of 200 MHz to 1 GHz. It may be a material. Vinyl chloride is suitable as the material for the resin plate, but other resins having a relative dielectric constant similar to that of vinyl chloride (2.8 to 3.1) in the frequency range of 200 MHz to 1 GHz may be used as the material. . Furthermore, the heat resistance of the top plate 50 may be improved by applying a heat treatment to the surface of the resin plate 52 (one of the resin plates of the top plate 50 laminated and integrated on the upper surface of the foam plate 51). Examples of the heat treatment include painting of a heat resistant paint and application of a heat resistant film. Furthermore, the strength of the top plate 50 may be increased by applying a high hardness process (a process for increasing the hardness) to the surface of the resin plate 52 by painting or film sticking.

  The first leg portion 10 and the second leg portion 20 are located separately on both sides (left and right) of the central portion in the width direction of the top board 50 and face each other (for example, face each other in parallel). The third leg 30 is provided at, for example, the center of the top plate 50 in the depth direction so as to pass, for example, the center of the first leg 10 and the second leg 20, and the first leg 10 and It is connected to the second leg 20. The top plate 50 is placed on the upper edge of the first to third leg portions 10, 20, 30 and connected to the first to third leg portions 10, 20, 30. The connection is preferably made using bolts and nuts, screws and connectors made of resin (for example, vinyl chloride). As shown in FIG. 2, the upper edges of the first to third legs 10, 20, and 30 preferably have an abutting portion with the lower surface of the top plate 50 having an H-shape. The top plate 50 is supported by the portion. Further, as shown in the figure, the lower edges of the first to third leg portions 10, 20, and 30 are in contact with the floor surface, and the contact portion has an H shape.

  According to the present embodiment, the following effects can be achieved.

(1) Since the top plate 50 and the first to third leg portions 10, 20, and 30 are formed by integrating resin plates on both surfaces of the foam plate, respectively, conventionally used wooden or glass Compared with a specimen desk made of fiber reinforced plastic, reflection of electromagnetic waves from the specimen desk can be suppressed. Here, in the low electromagnetic wave reflector of Patent Document 1, the legs are made of “fiber reinforced plastics made of polyester resin” as described above, whereas the low electromagnetic wave reflector for specimen 100 of the present embodiment is a ceiling. Since not only the plate 50 but also the first to third legs 10, 20, 30 are made of a resin plate and a foam laminate that have extremely low electromagnetic wave reflection, the comparison with the electromagnetic wave low-reflecting desk of Patent Document 1 Even so, low reflection can be expected.

(2) The first leg portion 10 and the second leg portion 20 are divided and positioned on both sides of the central portion in the width direction of the top board 50 and face each other (for example, face each other in parallel). Is provided in the center of the top plate 50 in the depth direction so as to pass between the central portions of the first leg portion 10 and the second leg portion 20 and is connected to the first leg portion 10 and the second leg portion 20. The top plate 50 is placed on the upper edge of the first to third leg portions 10, 20, and 30 and connected to the first to third leg portions 10, 20, and 30, so that the foam plate 51 is provided. Even when using a top plate 50 in which resin plates 52 and 53 are laminated and integrated on both sides (low rigidity (easy to bend)), it is possible to suppress bending of the top plate 50 when the test equipment is placed. The load-bearing performance as a desk for the specimen was improved compared to the structure in which the legs are only at the four corners of the top plate as in the electromagnetic wave low-reflection desk of Patent Document 1 (sufficient load-bearing performance. It is possible to realize an electromagnetic wave low reflector 100 for a specimen.

(3) In the case of a structure in which the legs are only at the four corners of the top plate as in the electromagnetic wave low reflection table of Patent Document 1, when a heavy EUT is placed near the center of the top plate, the resin plate and the foam In a top plate made of laminated plates, it is expected that the top plate will be bent and the test equipment will move in an unstable manner, resulting in a dangerous state. In particular, when a large-sized plasma TV, DVD recorder, surround system, etc. are measured as a system, the total weight may exceed 100 kg, and there is a need to prevent a dangerous state by preventing the top plate from bending. large. In the electromagnetic wave low reflector for specimen 100 according to the present embodiment, since the bending of the top plate 50 can be suppressed by the above-described connection structure, a dangerous state due to unstable movement of the equipment under test is suitably used. It is possible to avoid it.

(4) When the lamination and integration of the resin plate and the foam plate are performed through the adhesive layer, the top plate 50 and the first to third plates are compared with the case where the resin plate and the foam are simply laminated. The legs 10, 20, and 30 can be made to have high rigidity (hard to bend).

(Second embodiment)
FIG. 3 is a configuration diagram of an electromagnetic wave low reflector 200 for a specimen according to the second embodiment of the present invention, in which (A) is a front sectional view (AA ′ sectional view of FIG. ) And (B) are cross-sectional views (a cross-sectional view taken along the line BB 'in FIG. 1 (A)) viewed from below. The specimen low-electromagnetic wave reflector 200 according to the present embodiment is different from the specimen electromagnetic wave low-reflector desk 100 according to the first embodiment shown in FIGS. The difference is that the second reinforcing plate 70 is further provided, and the other points are the same.

  The first reinforcing plate 60 is obtained by integrating resin plates 62 and 63 on both surfaces of a foam plate 61. Similarly, the second reinforcing plate 70 is obtained by laminating and integrating resin plates 72 and 73 on both surfaces of the foam plate 71. Preferably, the lamination integration is performed via an adhesive layer (not shown) (an adhesive layer (not shown) is interposed between the foam plate and the resin plate). For example, an adhesive layer made of a polyol adhesive can be used.

  The first and second reinforcing plates 60 and 70 are provided so as to pass, for example, end portions of the first leg portion 10 and the second leg portion 20, respectively, so that the first leg portion 10 and the second leg portion are provided. It is connected to the part 20. The first and second reinforcing plates 60 and 70 have a shorter length in the height direction than the first to third leg portions 10, 20, and 30. Further, the first and second reinforcing plates 60 and 70 face each other (for example, face each other in parallel) so that the third leg portion 30 is located therebetween. That is, the first and second reinforcing plates 60 and 70 are separately provided on both sides of the third leg 30. Furthermore, the upper edges of the first and second reinforcing plates 60 and 70 are in contact with the lower surface of the top plate 50 and are connected to the top plate 50. The mounting positions of the first and second reinforcing plates 60 and 70 in the depth direction of the top plate 50 are closer to the third leg portion 30 than the end portions of the first leg portion 10 and the second leg portion 20. (That is, between the ends of the first leg 10 and the second leg 20 and the third leg 30).

  According to the present embodiment, in addition to the effects of the first embodiment, the first and second reinforcing plates 60 and 70 are provided to support the top plate 50 to place the EUT. It becomes possible to further suppress the bending of the top plate 50 and further improve the load bearing performance. Here, since the upper edges of the first and second reinforcing plates 60 and 70 are in contact with the lower surface of the top plate 50, the bending of the top plate 50 can be directly and effectively suppressed. In addition, since the first and second reinforcing plates 60 and 70 are obtained by laminating and integrating resin plates on both surfaces of the foam plate, the reflection of electromagnetic waves by the first and second reinforcing plates 60 and 70 is not caused. Very small.

(Third embodiment)
FIG. 4 is a front sectional view of an electromagnetic wave low reflector 300 for a specimen according to the third embodiment of the present invention. The specimen low electromagnetic wave reflector 300 of the present embodiment is compared with the specimen electromagnetic low reflector 200 of the second embodiment shown in FIG. 70 (the second reinforcing plate 70 does not appear in FIG. 4) and the connection position of the first and second leg portions 10 and 20 is different, and the other points are the same. Yes. According to the present embodiment, since the upper edges of the first and second reinforcing plates 60 and 70 are not in contact with the lower surface of the top plate 50, the effect of directly suppressing the bending of the top plate 50 is not great. The top plate is formed by lowering the connecting position between the first and second reinforcing plates 60 and 70 and the first and second leg portions 10 and 20 to suppress the deformation of the first and second leg portions 10 and 20. 50 deflections can be indirectly suppressed.

(Fourth embodiment)
FIG. 5 is a configuration diagram of an electromagnetic wave low reflector for a specimen 400 according to a fourth embodiment of the present invention, in which (A) is a front sectional view (AA ′ sectional view of FIG. 5 (B)). ), (B) are bottom views. The specimen low-electromagnetic reflector 400 of the present embodiment has a third leg 30 that is lower than the specimen electromagnetic low-reflection reflector 100 of the first embodiment shown in FIGS. 1 and 2. The difference is that the middle portion (preferably the central portion) of the lower edge is partially a cutout portion 37, and the other portions are the same. Note that the shape of the notch 37 may be a quadrangle or a semicircle (or a semi-elliptical shape) in addition to the triangle as shown in FIG.

  The purpose of providing the notch 37 is as follows. In other words, the electromagnetic noise measurement (EMI measurement) is performed while the electromagnetic wave low reflection table for a specimen is placed on a turntable (a turntable or a rotating floor) and the sample equipment is rotated together with the electromagnetic wave low reflection table for the specimen. Then, power is supplied from a power outlet arranged near the center of the turntable to the test equipment placed on the electromagnetic wave low reflection table for the test specimen. Therefore, in the present embodiment, in order to facilitate the power supply from the power outlet arranged near the center of the turntable, the lower edge of the third leg 30 of the electromagnetic wave low-reflecting table 400 for the specimen A portion located near the center of the turntable is cut out to form a cutout portion 37. As described above, according to the present embodiment, the middle portion of the lower edge of the third leg 30 is partially formed as the notch 37, so that the turntable for installing the electromagnetic wave low reflector for a specimen 400 is installed. It becomes possible to easily supply power to the test equipment placed on the low electromagnetic wave reflector for specimen 400 from a power outlet arranged near the center.

(Fifth embodiment)
FIG. 6 is a bottom view of an electromagnetic wave low reflector for specimen 500 according to the fifth embodiment of the present invention. The specimen low-electromagnetic wave reflector 500 according to the present embodiment is compared with the specimen electromagnetic low-reflection desk 400 according to the fourth embodiment shown in FIG. The leg part 20 further includes a fourth leg part 40 that is provided so as to pass between the intermediate parts of the leg part 20 and is connected to the first leg part 10 and the second leg part 20, and the third leg part 30 and the fourth leg part 20. Are different in that they are located on both sides (front and rear) of the central portion in the depth direction of the top plate 50 and are opposed to each other (for example, facing each other in parallel).

  Similarly to the third leg portion 30, the fourth leg portion 40 is obtained by integrating and integrating resin plates 42 and 43 on both surfaces of the foam plate 41, and an intermediate portion (preferably a central portion) of the lower edge. Is partially a notch 47.

  According to the present embodiment, it is possible to further suppress the bending of the top plate 50 by further including the fourth leg portion 40 having the same shape as the third leg portion 30 and further improve the load bearing performance. Become. However, by further including the fourth leg 40, the first to fourth legs 10, 20, 30 and 40 are blocked (in a large area), so that even when the lower edges of the third leg 30 and the fourth leg 40 are partly cut out to form notches 37 and 47, The work of connecting the power line of the test equipment to the power outlet arranged near the center of the turntable is not as easy as the electromagnetic wave low reflector for test specimen 400 of the fourth embodiment shown in FIG. Therefore, it can be said that the electromagnetic wave low reflector for specimen 400 of the fourth embodiment is superior in terms of convenience during actual measurement.

(Sixth embodiment)
FIG. 7 is a bottom view of an electromagnetic wave low reflector for a specimen 600 according to the sixth embodiment of the present invention. The specimen low electromagnetic wave reflector 600 of the present embodiment is compared with the specimen electromagnetic wave low reflector 500 of the fifth embodiment shown in FIG. The leg part 40 is different in that it is provided so as to pass between the end parts of the first leg part 10 and the second leg part 20, and the other points are the same.

  Considering a case in which a heavy EUT is placed near the center of the top plate 50, the third leg 30 and the fourth leg 40 as in the low electromagnetic wave reflector for specimen 600 of the present embodiment. Than the structure in which the end portions of the first leg portion 10 and the second leg portion 20 are provided to each other, the electromagnetic wave low reflector for specimen 500 of the fifth embodiment shown in FIG. Thus, the structure in which the third leg portion 30 and the fourth leg portion 40 are provided so as to pass between the intermediate portions of the first leg portion 10 and the second leg portion 20 has a load bearing performance. Although it can be said that it is advantageous in terms of the surface, when compared with the structure in which the legs are only at the four corners of the top plate as in the electromagnetic wave low reflection desk of Patent Document 1, the electromagnetic wave low reflection board 600 for the specimen of the present embodiment has excellent resistance. It can be said that it has load performance. Note that the convenience of actual measurement is similar to that of the fifth embodiment in that the electromagnetic wave low reflector for specimen 400 of the fourth embodiment is superior.

(Seventh embodiment)
8A and 8B are configuration diagrams of an electromagnetic wave low reflector for a specimen 700 according to a seventh embodiment of the present invention, in which FIG. 8A is a plan view and FIG. 8B is a front sectional view (FIG. 8A). BB 'sectional view). The specimen low electromagnetic wave reflector 700 of the present embodiment has a third leg portion 30 as compared with the specimen electromagnetic wave low reflector 100 of the first embodiment shown in FIGS. 1 and 2. A middle portion (preferably a central portion) of the upper edge is partially a cutout portion 39, and a portion of the top plate 50 located above the cutout portion 39 (in the example of FIG. 8, the central portion of the top plate 50). Are different from each other in that they are openings 55, and are identical in other respects. Note that the shape of the notch 39 may be a quadrangle or a semicircle (or a semi-elliptical shape) in addition to the triangle as shown in FIG. Further, the shape of the opening 55 may be a quadrangle or an ellipse in addition to the circle as shown in FIG.

  As already described in the fourth embodiment, the test object mounted on the low electromagnetic wave reflector for specimen is placed from the power outlet located near the center of the turntable where the low electromagnetic wave reflector for specimen is installed. Power is supplied to the test equipment. For this reason, in the low electromagnetic wave reflector for specimen 700 of the present embodiment, the opening 55 is provided in a part of the top plate 50, and the portion located below the opening 55 in the upper edge of the third leg 30 By providing the notch 39 in the opening, the power line of the EUT can be connected to a power outlet disposed near the center of the turntable through the opening 55, thereby improving convenience during actual measurement.

(Eighth embodiment)
FIG. 9 is a bottom view of an electromagnetic wave low reflector 800 for a specimen according to the eighth embodiment of the present invention. The specimen low-electromagnetic reflector 800 of the present embodiment has first to third legs as compared with the specimen electromagnetic low-reflector 100 of the first embodiment shown in FIGS. 1 and 2. Non-slip 801 to 806 made of, for example, rubber is preferably attached to (preferably bonded to) the lower edge (bottom surface) of the portions 10, 20, and 30. I'm doing it. The thickness of the anti-slip 801 to 806 is, for example, about 5 mm. Note that the arrangement and the number of the anti-slip are not limited to the example of FIG. 9 and can be appropriately changed. According to the present embodiment, it is possible to improve the safety by preventing the specimen electromagnetic wave low reflector 800 from sliding on the floor surface.

(Ninth embodiment)
FIG. 10 is a plan view of an electromagnetic wave low reflector 900 for a specimen according to the ninth embodiment of the present invention. The specimen low-electromagnetic wave reflector 900 of the present embodiment is different from the specimen electromagnetic wave low-reflector desk 100 of the first embodiment shown in FIG. 1 and FIG. The resin plate that is laminated and integrated on the upper surface of the foam plate 51) is composed of a plurality of resin plate small pieces 521 (resin plate divided pieces) divided in the width direction and depth direction of the top plate 50. Dissimilar and otherwise consistent. The resin plate piece 521 may be practically about 100 mm in length and width, for example. The resin plate 52 may be divided only in either the width direction or the depth direction of the top plate 50.

  In the present embodiment, the resin plate 52 is used as a material constituting the upper surface of the top plate 50 to make the electromagnetic wave low reflection, and attention is paid to the point that the resin plate is easily damaged compared to wood or glass fiber reinforced plastics. The resin plate 52 constituting the upper surface of the top plate 50 is composed of divided resin plate pieces 521. According to this, the repair can be performed easily and inexpensively by exchanging a part of the resin plate small piece 521. Further, the joint between the resin plate small pieces 521 is convenient as a reference line when placing the test equipment. In addition, if necessary, the use convenience may be enhanced by drawing a x mark or the like at the center of the top surface of the top board 50.

(Tenth embodiment)
FIG. 11 is a plan view of an electromagnetic wave low reflector 1000 for a specimen according to the tenth embodiment of the present invention. The specimen low-electromagnetic wave reflector 1000 of the present embodiment has a resin plate 52 (top plate 50) as compared with the specimen electromagnetic low-reflector desk 100 of the first embodiment shown in FIGS. This is different in that the lattice lines 523 are drawn on the surface of the resin plate that is laminated and integrated on the upper surface of the foam plate 51, and is the same in other points. The grid line 523 is useful as a reference line when placing the EUT. The interval between adjacent grid lines 523 is practically about 100 mm, for example. In addition, if necessary, the use convenience may be enhanced by drawing a x mark or the like at the center of the top surface of the top board 50.

(Eleventh embodiment)
FIG. 12 is a block diagram of an electromagnetic wave low reflector 1100 for a specimen according to an eleventh embodiment of the present invention, where (A) is a front sectional view (AA ′ sectional view of FIG. 12 (B)). ) And (B) are cross-sectional views (a cross-sectional view taken along the line BB 'in FIG. 1 (A)) viewed from below. Compared with the electromagnetic wave low reflector 100 for the specimen of the first embodiment shown in FIGS. 1 and 2, the specimen low electromagnetic wave reflector 1100 of the present embodiment has a side surface (foamed). Resin plates 54 to 57 (for example, vinyl chloride) are affixed to the body plate 51 and the resin plates 52 and 53, and the side surfaces of the first and second legs 10 and 20 (the foam plates 11 and 21 and the resin). The difference is that resin plates 14, 15, 24, and 25 (for example, vinyl chloride) are affixed to at least the visible side portions of the side surfaces of the plates 12, 13, 22, and 23, and the other points are the same. ing. An adhesive is preferably used for attaching the resin plate.

  According to the present embodiment, it is possible to protect each foam material from impacts on the top plate 50 and the side surfaces of the first and second leg portions 10 and 20. Moreover, it can be expected that sticking a resin plate on the side surface which can be seen will lead to improvement of the design. The resin plates 54 to 57 may cover at least the side surface of the foam plate 51, and the resin plates 14, 15, 24, and 25 may cover at least visible portions of the side surfaces of the foam plates 11 and 21.

(Twelfth embodiment)
FIGS. 13A and 13B are configuration diagrams of an electromagnetic wave low reflector for a specimen 1200 according to a twelfth embodiment of the present invention, where FIG. 13A is a right side view and FIG. 13B is a bottom view. The specimen low electromagnetic wave reflector 1200 according to the present embodiment has a first leg and a second leg as compared with the specimen electromagnetic low reflector 100 according to the first embodiment shown in FIGS. Part (preferably both ends) of the lower edges of the portions 10 and 20 are notched portions 18, 19, 28, and 29, and casters 901 to 904 are attached to the notched portions 18, 19, 28, and 29. It is different in point and is consistent in other points. The lower ends of the first to third legs 10, 20, and 30 are higher than the lower ends (that is, floor surfaces) of the casters 901 to 904 by a predetermined length that is smaller than the length in the height direction of the casters 901 to 904. To position. The predetermined length is preferably 5 mm to 15 mm. The reason why it is 5 mm or more is to prevent the inconvenience of hitting the uneven step on the floor surface, and the reason that it is 15 mm or less is to reduce the inclination of the electromagnetic wave low reflection table 1200 for the specimen when the caster is detached. The arrangement and the number of casters are not limited to the example of FIG. 13 and can be changed as appropriate. Further, the wheels of the casters 901 to 904 may be made of resin or rubber. Further, the casters 901 to 904 are preferably provided with stoppers. Further, a part of the casters 901 to 904 may be a free type (the direction is variable), and the other may be a fixed type (the direction is fixed).

  In the present embodiment, casters 901 to 904 are attached to the lower portions of the first and second leg portions 10 and 20 to make the specimen electromagnetic wave low reflection table 1200 highly portable. Here, in the present embodiment, by installing the casters 901 to 904 as the cutout portions 18, 19, 28, and 29, the lower portions of the first and second leg portions 10 and 20 without providing the cutout portions. Compared with the case where the casters 901 to 904 are attached to the floor, the lower ends of the first to third leg portions 10, 20, and 30 are brought closer to the floor surface (for example, a height of 5 mm to 15 mm from the floor surface). Therefore, even if the casters 901 to 904 are missing, the specimen low electromagnetic wave reflector 1200 does not tilt greatly, and the test equipment placed on the specimen low electromagnetic reflector 1200 falls over. It is possible to prevent or fall.

  FIG. 14 is a partially enlarged view when the C channel is attached to the caster installation position in the present embodiment. Although only the casters 904 and the corresponding C channels 914 and their peripheral parts are shown in this figure, the C channels can be similarly attached to the positions where the casters 901 to 903 are installed.

  The C channel 914 is attached to the upper side of the notch 29 formed in the second leg 20. The C channel 914 is preferably attached by screwing in order to increase the attachment strength. In order to reduce reflection of electromagnetic waves, the C channel 914 and mounting screws are preferably made of resin. In the case where the C channel 914 is made of resin, a thickness of 3 to 5 mm may be appropriate. Caster 904 is preferably screwed to C channel 914. By attaching the C channel 914 to the notch 29 and attaching the caster 904 to the C channel 914, the attachment strength of the caster 904 can be increased.

  FIGS. 15A and 15B are configuration diagrams of an electromagnetic wave low reflector for a specimen 1500 according to an embodiment of the present invention, in which FIG. 15A is a front view and FIG. FIGS. 16A and 16B show the same configuration, in which FIG. 16A is a bottom view and FIG. 16B is a plan view.

  An electromagnetic wave low reflector for a specimen 1500 of the present example includes the second embodiment shown in FIG. 3, the fourth embodiment shown in FIG. 5, and the eighth embodiment shown in FIG. This corresponds to a combination of the form and the tenth embodiment shown in FIG. That is, the low electromagnetic wave reflector for specimen 1500 of the present example includes the first reinforcing plate 60 in addition to the configuration of the low electromagnetic wave reflector for specimen 100 of the first embodiment shown in FIGS. And a second reinforcing plate 70, and a central portion of the lower edge of the third leg 30 is partially formed as a notch 37, and is below the first to third legs 10, 20, 30. Anti-slip 801 to 806 made of rubber are bonded to the edge (bottom) end, and lattice lines 523 are drawn on the surface of the top board 50.

  The first to third legs 10, 20, and 30, the top plate 50, and the first and second reinforcing plates 60 and 70 are thick on both sides of a 37 mm thick foam plate made of extruded styrene foam. A resin plate made of a vinyl chloride plate having a thickness of 1 mm is laminated and integrated through an adhesive layer made of a polyol adhesive. The top plate 50 has a width of 1.5 m and a depth of 1 m. Moreover, the height of the electromagnetic wave low reflector 1500 for a specimen is 0.8 m. These dimensions are standard in CISPR (International Special Committee on Radio Interference). The width of the first and second leg portions 10 and 20 is 0.8 m, and the width of the third leg portion 30 is 1 m. The first to third legs 10, 20, and 30, the top plate 50, and the first and second reinforcing plates 60 and 70 are connected to the ceiling L-shaped connector, the L-shaped connector, and the flat plate. A mold connector, a Reny pan head screw M6 × 20, a demon nut M6, a Reny hexagon bolt M8 × 50, and a cap nut M8 are used. Each connector, each screw, each nut and bolt were made of resin.

  In order to investigate the load-bearing performance of the electromagnetic wave low reflector 1500 for the specimen of this example, a vertical force test (in accordance with “JIS-S 1205: 1998” “Furniture—Table—Strength and Durability Test Method”) Main working surface) and horizontal force test. As a result, even in test category 4 (1250N), which is the maximum test level for one-point load in the vertical force test, and test category 5 (900N), which is the maximum test level in the horizontal force test, deformation, loosening, Damage or the like was not confirmed. Furthermore, in the vertical force test, a test in which a load of 2000 N was applied at one point load was performed as a reference. As a result, although an indentation was generated on the top board 50 after the test, other troubles were not confirmed. In the vertical force test, there was no problem at 1250N load with a single point load from a 100 mm diameter patch plate, and only indentation occurred at 2000N. It is presumed that there is no problem even if it is a load. From these results, the electromagnetic wave low reflector for the specimen of the example of the present invention is the test category 4 (1250 N) which is the maximum test level of one point load in the vertical force test in at least “JIS S 1205” and the horizontal It was confirmed that the load-carrying performance satisfying test category 5 (900 N), which is the maximum test level of the force test, was achieved.

Next, in order to investigate the electromagnetic wave low reflection performance of the electromagnetic wave low reflection device 1500 for the specimen of the present example, a frequency of 200 MHz to 1 GHz in accordance with the section 5.9.2 of “CISPR16-1-4 Second edition”. The deviation of the setup table (specimen table) was obtained in the range. That is, when there is no specimen desk, when the electromagnetic wave low reflection machine 1500 for the specimen of this example is installed, when a foaming material desk (desk made of extruded styrene foam and subjected to surface coating) is installed, and The reception voltage was measured for each case where a conventional wooden desk was installed, and the deviation of each desk was determined based on the reception voltage (measurement voltage) when there was no specimen desk. In addition, the size of the top plate of each desk was set to 1.5 m × 1 m, and the height of the desk was unified to 0.8 m. Deviation is the following equation: Δf = | V _{r / with} -V _{r / without} |
Defined by Here, V _{r / without} is a measurement voltage (unit dB (μV)) at a specific frequency _without a setting table (specimen table), and V _{r / with} is a measurement at a specific frequency _with a setting table (specimen table). It is a voltage (unit: dB (μV)).

FIG. 17 is a characteristic diagram showing measurement results of the 10 m method. FIG. 18 is a characteristic diagram showing measurement results of the 3m method. In these figures, the vertical axis represents the received voltage difference (that is, V _{r / with} -V _{r / without} ) that does not take an absolute value in the above equation (1). In these drawings, measurement data is shown from 100 MHz as a reference, but it can be seen that there is almost no deviation even at a conventional wooden desk at 100 to 200 MHz. Moreover, from these figures, the electromagnetic wave low reflection desk 1500 for the specimen of this example has an excellent load-bearing performance as described above, and in comparison with a foam desk that has almost no radio wave reflection. It can be seen that it has inferior electromagnetic wave low reflection performance.

FIG. 19 is an explanatory diagram showing the maximum received voltage difference between the + side and the − side (maximum value of V _{r / with} −V _{r / without} ) in the frequency range of 200 MHz to 1 GHz of FIGS. 17 and 18 for each desk. is there. From this figure, the received voltage when the low electromagnetic wave reflector for specimen 1500 measured in the frequency range of 200MHz to 1GHz according to 5.9.2 of "CISPR16-1-4 Second edition" is installed is 10m method. It can be seen that, in both the 3 m method and the 3 m method, the received voltage when the electromagnetic wave low reflector for specimen 1500 is not installed is within ± 1 dB with reference to the received voltage.

FIG. 20 shows the + side and − side in the same frequency range when the deviation of the setup table (specimen table) is measured in the 3 m method in the frequency range of 1 to 6 GHz according to “CISPR / A / 774 / CD”. FIG. 6 is an explanatory diagram showing the maximum received voltage difference (maximum value of V _{r / with} −V _{r / without} ) for each desk. From this figure, in the frequency range of 1 to 6 GHz, the electromagnetic wave low reflection desk 1500 for the specimen of this example has a large deviation compared to the foam desk, but the deviation can be significantly reduced compared to the conventional wooden desk. I understand.

  From the above results, the electromagnetic wave low reflection table 1500 for the test piece of this example has sufficient load-bearing performance as the desk for the test piece (in “JIS S 1205”, the test category 4 of the main work surface in the vertical force test, horizontal Load-bearing performance that satisfies test category 5 in the force test) and extremely good electromagnetic wave low reflection performance (frequency range from 200 MHz to 1 GHz by the measurement method according to 5.9.2 of “CISPR16-1-4 Ed.2”) In addition, it was confirmed that the electromagnetic wave has a low electromagnetic wave reflection performance satisfying a deviation Δf ≦ 1 dB.

  The present invention has been described above by taking the embodiment as an example. However, it will be understood by those skilled in the art that various modifications can be made to each component of the embodiment within the scope of the claims. Hereinafter, modifications will be described.

  In the embodiment, the case where the top plate and the leg portion and the reinforcing plate are connected using a bolt, a nut, a screw, and a connector has been described. However, in the modified example, the lower surface of the top plate 50 and the first and second leg portions are used. A fitting groove may be provided in the contact surface with the third leg 30 at 10 and 20, and connection by a fitting structure may be performed.

  The above-described embodiments are not limited to being applied alone, and it is also effective to apply them in combination. For example, either the second or third embodiment, the fourth embodiment, the seventh embodiment, the eighth or twelfth embodiment, the ninth or the tenth It is conceivable to combine two or more of any of the embodiments and the eleventh embodiment.

DESCRIPTION OF SYMBOLS 10 1st leg part 20 2nd leg part 30 3rd leg part 50 Top plate 60 1st reinforcement board 70 2nd reinforcement board 11, 21, 31, 51, 61, 71 Foam board 12,13 , 22, 23, 32, 33, 52, 53, 62, 63, 72, 73 Resin plates 100, 200,..., 1200, 1500

Claims (14)

A top plate and first to third legs,
Each of the top plate and the first to third leg portions is obtained by laminating and integrating resin plates on both surfaces of the foam plate,
The first and second leg portions are opposed to each other, and the third leg portion is provided so as to pass the first and second leg portions and is connected to the first and second leg portions. The top plate is placed on the upper edge of the first to third legs, and is connected to the first to third legs.   2. The low electromagnetic wave reflector for a specimen according to claim 1, wherein an adhesive layer is interposed between the foam plate and the resin plate.   3. The test specimen according to claim 1, wherein the upper edge of each of the first to third leg portions has an H-shaped contact portion with the top plate. 4. Electromagnetic wave low reflection desk. In the electromagnetic wave low reflector for a specimen according to any one of claims 1 to 3,
A first reinforcing plate and a second reinforcing plate, which are laminated and integrated with resin plates on both sides of the foam plate;
The first and second reinforcing plates are provided to pass the first and second legs, respectively, and are connected to the first and second legs,
The first and second reinforcing plates are shorter than the first to third leg portions in the height direction, and are opposed to each other so that the third leg portion is located therebetween. Electromagnetic wave low reflection desk for specimens.   5. The low electromagnetic wave reflector for a specimen according to claim 4, wherein upper edges of the first and second reinforcing plates are in contact with the top plate.   The electromagnetic wave low reflecting desk for a specimen according to any one of claims 1 to 5, wherein an intermediate portion of a lower edge of the third leg portion is partially cut out. .   The electromagnetic wave low reflection desk for a specimen according to any one of claims 1 to 6, wherein an intermediate portion of an upper edge of the third leg portion is partially a cutout portion, and the cutout portion of the top plate is formed. An electromagnetic wave low reflection desk for a specimen, in which a portion located above the opening is open.   The electromagnetic wave low reflection desk for a specimen according to any one of claims 1 to 7, wherein the resin plate of the top plate is laminated and integrated on the top surface of the foam plate in the width direction and the depth direction. An electromagnetic wave low reflection desk for a specimen, comprising a plurality of resin plate divided pieces divided at least on the basis of the above.   In the electromagnetic wave low reflective table for a specimen according to any one of claims 1 to 8, a heat treatment is applied to a surface of the resin plate of the top plate that is laminated and integrated on an upper surface of the foam plate. An electromagnetic wave low reflector for the specimen.   In the electromagnetic wave low reflection desk for a specimen according to any one of claims 1 to 9, the resin plate is made of a vinyl chloride plate having a thickness of 1 mm, and the foam plate is made of an extruded styrene foam having a thickness of 37 mm. Electromagnetic wave low reflection desk for specimens. In the electromagnetic wave low reflector for a specimen according to any one of claims 1 to 10,
A part of the lower edge of the first and second legs is a notch, and a caster is attached to each notch,
A lower electromagnetic wave reflector for a specimen, wherein the lower ends of the first to third legs are positioned above the lower end of the caster by a predetermined length smaller than the length of the caster in the height direction.   The electromagnetic wave low reflector for a specimen according to claim 11, wherein the predetermined length is 5 mm to 15 mm.   The test specimen according to any one of claims 1 to 12, wherein the specimen has a load-bearing performance satisfying test category 4 of the main work surface in a vertical force test according to JIS S 1205: 1998. Electromagnetic wave low reflection desk.   The electromagnetic wave for a specimen according to any one of claims 1 to 13, wherein the electromagnetic wave for the specimen is measured in a frequency range of 200 MHz to 1 GHz in accordance with 5.9.2 of CISPR16-1-4 Second edition. The reception voltage when the low reflector is installed is at least one of the 10 m method and the 3 m method, and is within a range of ± 1 dB with respect to the reception voltage when the electromagnetic wave low reflector for this specimen is not installed. Electromagnetic low reflection desk for specimens.

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