JP2004311499A - Shield box and its mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield box capable of shielding an electromagnetic wave conveniently and surely while ensuring stabilized contact with a wiring board, and to provide its mounting structure. <P>SOLUTION: The shield box comprises a top plate part 6 and a side wall part 7 suspending from the circumferential edge thereof wherein at least one of the inner circumferential surface and the outer circumferential surface exhibits conductivity. The shield box is arranged on a wiring board contained in a housing to surround an electronic circuit and/or an electronic component on the wiring board. The top plate part is provided with a protrusion 10 abutting against the inner surface of the housing to deform the top plate resiliently when the shield box is arranged on the wiring board and contained in the housing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shield box and a mounting structure of the shield box for protecting an electronic circuit having an electronic component such as an IC mounted on a wiring board from electromagnetic waves from the outside or preventing leakage of the electromagnetic waves from the electronic component.
[0002]
[Prior art]
In electronic devices such as mobile phones and small wireless devices, electronic circuits such as high-frequency circuits, logic circuits, transmission circuits, and reception circuits in which electronic components such as ICs and LSIs are mounted on a wiring board are affected by electromagnetic noise from the outside world. Electromagnetic wave shields are required to prevent malfunctions caused by the electromagnetic wave or to prevent electromagnetic waves leaking from the electronic circuit from affecting other devices or the human body.
[0003]
As a method of shielding electromagnetic waves, it is known to surround the electronic circuit with a ground of a wiring board and a shield box as a conductive casing. This shield box is required to be easily detachable for maintenance of the electronic components to be shielded, and it is also required to have good assemblability, so the connection between the shield box and the ground of the wiring board is devised. Has been elaborated.
In addition, as one of attempts to increase the mounting capacity of electronic components in a small electronic device and to further reduce the size, a resin housing integrated with a metal plate or a shield box having the same rigidity as a wiring board is engaged with a claw. Alternatively, there is a proposal in which the connection portion of the shield box is directly connected to the ground of the wiring board by fixing with a screw (for example, see Patent Document 1).
In addition, as a countermeasure against electromagnetic wave leakage due to the occurrence of a gap between the shield box and the ground of the wiring board due to the warpage of the board or the lack of dimensional accuracy when molding the shield box, etc., use a metal or resin shield box. There is also a proposal of using a plated material and connecting it to the ground of a wiring board via a small piece of metal having a spring property (for example, see Patent Document 2).
In addition, conductive small protrusions are provided on the walls of the resin-made protrusions plastically deformed on the walls of the resin shield box whose surface is made conductive by plating or the like, and the small protrusions are connected to the ground of the wiring board through the small protrusions. There is also a proposal for connection (for example, see Patent Document 3).
Also, there is a proposal of providing a conductive rubber on a joint surface of a shield box formed of a resin or a shield box formed in a housing with a ground of a wiring board and connecting them (for example, see Patent Documents 4 and 5). is there.
There is also a proposal (for example, see Patent Document 6) in which a tongue piece is provided at an end of a side wall of a resin-made shield box and connected to a joint surface of a wiring board with a ground.
[0004]
[Patent Document 1]
JP 2000-151132 A [Patent Document 2]
Japanese Patent Application Laid-Open No. Hei 10-224074 [Patent Document 3]
Japanese Patent Application Laid-Open No. Hei 10-22671 [Patent Document 4]
Japanese Patent Application Laid-Open No. 2000-196278 [Patent Document 5]
Japanese Patent Application Laid-Open No. 2001-111283 [Patent Document 6]
Japanese Patent No. 3283161 [0005]
[Problems to be solved by the invention]
However, in Patent Literature 1, distortion and warpage are likely to occur in the housing, shield box, or printed circuit board, and a gap is generated between the connection portion of the shield box and the ground of the wiring board to ensure sufficient shielding performance. There is a problem that there is a high possibility that the operation cannot be performed. Furthermore, in order to cause a rigid housing or the like to follow the connection partner with stress, that is, to connect, an excessive stress is required, and the periphery of the engaging claw or the screw portion must be in a rigid state. In addition, electronic devices such as mobile phones and small wireless devices have a problem that extra volume and weight are required.
Further, in Patent Document 2, small pieces having metallic spring properties must be provided in advance on a wiring board by soldering or the like, which is troublesome, and the pieces are deformed by handling during the process. We had to fix it and it wasn't productive. Furthermore, the number of parts increased, which was not rational. Also, at the time of recycling, it was not easy to separate and sort parts.
According to Patent Literature 3, the conductive small protrusion is likely to be plastically deformed when a force exceeding a certain level is applied, and once plastically deformed, even if the shield box is opened again for repair or the like and then reassembled, conduction is not achieved. There was a problem that it would be certain.
In Patent Documents 4 and 5, the width of the connection between the shield box or the like and the ground of the wiring board, that is, the width of the outer wall or the rib of the shield box or the like is as narrow as 1 mm or less, and the conductive elastic member is fitted therein. Is very difficult, and the work is time-consuming because the elastic member is cut or stretched. In addition, when a liquid material is provided by a dispenser or the like, an expensive device having position control and discharge amount control must be used, and after the housing or shield box is manufactured, the material is transported to a place where dispensing can be performed. However, there is a problem that the production time is prolonged, the casing is damaged, and the product yield is reduced.
[0006]
As described above, in the conventional device, there is a limit in the shielding performance of a small electronic device such as a mobile phone, and it is not easy to assemble, and there is a problem in assemblability in a short time. Further, the number of parts is increased, and it is necessary to make the housing robust, and the advantage of the small, small, and small electronic devices is lost. In addition, special equipment and labor for transportation were required, and it was not economically reasonable.
On the other hand, the shield box described in Patent Literature 6 is formed by subjecting a molded plastic sheet to a conductive treatment and fitted into a recess of a housing, so that it is small and lightweight, and is easy to assemble. is there.
[0007]
However, in the shield box described in Patent Literature 6, the contact between the tip of the side wall portion and the wiring board is unstable, and the electromagnetic wave shielding performance may be insufficient. That is, Patent Literature 6 discloses a structure in which a horizontal flange-shaped tongue portion is formed at the end of a side wall portion and this tongue portion is brought into contact with a wiring board-shaped ground. When placed on the board and housed in the housing, the top plate of the shield box is pressed by the inner surface of the housing, and a compressive force is applied in the height direction of the shield box. It may be deformed so as to bulge, the tongue piece may deviate from the ground, and the contact between the two may become insufficient.
In addition, if there is a tolerance in assembling the wiring board and the housing, the load applied to the side wall changes, and the load changes the degree of bending of the side wall, so that the lower end of the side wall may not contact the wiring board. is there.
Further, in Patent Document 6, a deformable tongue portion having a curved shape is formed by folding the front end side of a side wall portion. When the tongue portion is housed in a housing, the tongue portion is broken and Although a configuration in contact with the ground is described, in order to form such a deformable tongue portion, the curvature of the tongue portion must be increased to some extent, which requires extra space, There is a problem that is disadvantageous for miniaturization.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shield box that can easily and reliably implement an electromagnetic wave shield by a shield box and that can make stable contact with a wiring board, and a mounting structure thereof.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a top plate portion and a side wall portion hanging down from a peripheral edge thereof, wherein at least one of an inner surface and an outer surface has conductivity, and a wiring housed in a housing. A shield box arranged on a substrate and surrounding an electronic circuit and / or electronic component on the wiring board, wherein a shield box is arranged on the wiring board on the top plate portion and housed in the housing. And a shield box provided with a projection which abuts on the inner surface of the housing to elastically deform the top plate.
In the shield box of the present invention, the height (h1) of the protrusion from the top plate portion of the projection is the height (h) of the shield box from the upper end of the protrusion of the top plate portion to the lower end of the side wall portion when not compressed. Is preferably in the range of h1 = 0.05 to 0.4h.
Further, it is preferable that the height (h) of the shield box from the upper end of the protrusion of the top plate portion to the lower end of the side wall portion when not compressed is 1 to 3 mm.
Furthermore, it is preferable that it is formed from a synthetic resin sheet having a shear modulus of 10 ⁵ to 10 ¹⁰ Pa.
Further, a plurality of small rooms each including the top plate portion and the side wall portion may be continuously provided via a partition wall portion, and the projection may be provided on a top plate portion of each of the small rooms. preferable.
Further, according to the present invention, the shield box is housed inside a housing housing a wiring board therein, and a projection provided on a top plate portion of the shield box is pressed by an inner surface of the housing to lower the lower end of the side wall portion. Provided is a mounting structure of a shield box, wherein an electromagnetic circuit is shielded by covering an electronic circuit on the wiring board with a shield box by being pressed against the wiring board.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an electronic device incorporating the shield box 1. As shown in FIG. 1, the shield box 1 and the wiring board 2 are arranged between the divided housings 3 and 3 'of the electronic device. Various electronic circuits 5 on the wiring board 2 are surrounded by a metal foil (not shown) in a layer different from the wiring of the shield box 1 and the wiring of the wiring board 2. It is used by being connected to the ground 4 on the wiring board 2 of the potential. The electronic circuit 5 is composed of functions of a high-frequency circuit, a logic circuit, a transmission circuit, a reception circuit, and the like. Since the degree of influence of external electromagnetic noise or the frequency and intensity of leaking electromagnetic waves is different, each electronic circuit 5 Reference numeral 5 is divided by a ground 4.
[0011]
2 to 5 are views showing an example of the shield box 1 according to the embodiment of the present invention, FIG. 2 is a perspective view of the shield box 1, and FIG. 3 is a sectional view taken along the line AA in FIG. 4 is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 5 is a cross-sectional view of the electronic device with the shield box 1 incorporated therein. In this embodiment, the shield box 1 is composed of a top plate 6 and a side wall 7 hanging down from the periphery thereof, and a plurality of substantially box-shaped small chambers 8 are continuously provided via a partition 9. It has a structure. When the shield box 1 is placed on the wiring board 2 and housed in the housing 3, the top plate 6 of each small room 8 abuts on the inner surface of the housing 3 to elastically deform the top plate 6. One or more projections 10 to be provided are provided.
[0012]
The projections 10 need only be able to achieve the purpose of elastically deforming the top plate 6 of the small room 8 when the shield box 1 is placed on the wiring board 2 and housed in the housing 3. The formation position is not particularly limited. For example, in the example shown in FIG. 2, a state in which both the small room 8 provided with one protrusion 10 on the top plate 6 and the small room 8 provided with a plurality of protrusions 10 are provided in one shield box 1. Is shown. Further, the shape of the projection 10 is not particularly limited. In addition to the projection 10 having a circular shape in a plan view as shown in the figure, a projection having a shape such as an angle or an ellipse in a plan view can be provided.
[0013]
The protrusion height h1 of the protrusion 10 is h1 = 0.05 to 0.4h with respect to the height h of the shield box from the upper end of the protrusion 10 provided on the top plate 6 in the non-compressed state to the lower end of the side wall 7. Preferably, it is within the range. If the protrusion height h1 is less than the above range, when housed in the housing 3, the protrusion 10 pushes the top plate 6, and the amount of deformation that elastically deforms the top plate 6 becomes small, and the wiring board 2-housing The effect of absorbing the assembly tolerance between the bodies 3 cannot be sufficiently obtained. On the other hand, if the protrusion height h1 exceeds the above range, the protrusion height of the protrusion 10 with respect to the height of the shield box becomes excessive, and the accommodation capacity of the shield box 1 decreases, which is disadvantageous in design.
[0014]
The size of the shield box 1 is determined by the volume of the electronic circuit 5 included therein, and is not limited thereto. Generally, one side is 10 to 100 mm and the height h of the shield box is about 1 to 3 mm. . The heights of the plurality of small rooms 8 may be the same as each other, or the heights of some of the small rooms 8 may be different. The shape of the shield box 1, the number of small rooms 8, and the like are not limited to this example, and can be appropriately changed according to the structure of the electronic circuit 5 to be shielded. The shape may be such that it surrounds all at once.
[0015]
A material made of metal or synthetic resin is selected as the material of the shield box 1, but synthetic resin is preferable in view of ease of processing and weight. Examples of the synthetic resin include thermoplastic resins such as polyethylene terephthalate, polybutylene terephthalate, polystyrene, polycarbonate, polyacrylonitrile, polyamide, polyphenylene oxide, acrylonitrile-butadiene-styrene copolymer, and ethylene-vinyl acetate copolymer, and polyester-based resins. Thermoplastic elastomers such as elastomers, styrene-based elastomers, polyamide-based elastomers, and polyurethane-based elastomers, and rubbers such as ethylene propylene rubber, styrene-butadiene rubber, nitrile rubber, urethane rubber, and silicone rubber are exemplified. In addition, modified products, mixtures, and composites of the above materials may be used.
[0016]
It is preferable that at least one of the inner surface and the outer surface of the shield box 1 has conductivity, and the surface resistance thereof is 10 ¹ to 10 ⁻⁵ Ω / □. If the resistance is higher than this, a sufficient shielding effect cannot be obtained. When the shield box 1 is made of a synthetic resin, its surface can be plated with copper, nickel, silver, gold, or the like, or a known method such as sputtering or vapor deposition can be used, or can contain metal or carbon black. It can also be achieved by coating with a paint or kneading a conductive filler such as carbon black into a synthetic resin in advance. There is no limitation on the shape of the conductive filler, but one having a high aspect ratio is efficient. When the surface resistance is low, the reflection of electromagnetic waves can be suppressed, but in order to attenuate efficiently, a soft magnetic material such as ferrite, chromium ferrite, permalloy, or a carbon microcoil may be used in combination. In this example, the lower end of the side wall portion 7 and the lower end of the partition portion 9 are in contact with the ground 4 of the wiring board 2, and the electrical connection between the shield box 1 and the ground 4 is maintained. It is desirable to impart conductivity to the inner surface side of the shield box 1. That is, if conductivity is imparted to the inner surface side of the shield box 1, the connection can be established only by sandwiching the shield box 1 between the housing 3 and the wiring board 2.
[0017]
The shield box 1 can form a box-shaped shield box by a known method using a sheet or a pellet of the above-described material, and can be formed by die molding, vacuum molding, blow molding, injection molding, or molding. Can be shaped.
In general, vacuum molding or blow molding, which has a rapid molding cycle, is good. A thermoplastic film having a thickness of 50 to 500 μm is heated to 50 to 300 ° C., and is pressed or vacuumed so as to follow a mold. , Can be shaped.
When the sheet is shaped, as shown in FIGS. 2 to 5, the partition 9 is formed by folding the sheet. In the case of using a sheet, since the conductive processing, the notch processing, the inspection, the trimming, and the like can be performed in a hoop shape, the conveyance is easy.
[0018]
The shield box 1 preferably has a low load and deformable plate thickness so that the lower end portions of the side wall 7 and the partition 9 can be connected to the ground 4 with a low pressing force. it is preferable to elastically deform at ⁵ to 10 ¹⁰ Pa.
If the shear modulus is larger than the above range, the load for pressing the shield box 1 against the ground 4 becomes excessive, deforming the housing 3 and the wiring board 2, resulting in poor contact. If the shear modulus is smaller than the above range, the shield box 1 may be easily deformed, the contact pressure may be insufficient, and the contact may be poor.
[0019]
The thickness of each of the top plate portion 6, side wall portion 7, partition wall portion 9, and projection 10 depends on the shear modulus of the material, but is usually preferably 1 mm or less, and substantially 0.2 to 0.2 mm. More preferably, it is 0.8 mm. When the thickness exceeds 1 mm, a space is required around the electronic circuit 5, which hinders downsizing of the electronic device.
[0020]
As shown in FIG. 5, the shield box 1 surrounds the electronic circuit 5 provided on the wiring board 2 housed in the housings 3 and 3 ', and connects the wiring board 2 and one of the housings 3 to each other. Placed between. In this assembled state, the projection 10 formed on the top plate 6 of the shield box 1 comes into contact with the inner surface of the housing 3 and is pushed down by the housing 3 toward the wiring board 2 so that the top plate 6 is elastically deformed. The lower end of the side wall 7 and the lower end of the partition 9 are in contact with the ground 4 of the wiring board 2. The electronic circuit 5 on the wiring board 2 is surrounded by a shield box 1 having conductivity and a metal foil (not shown) of the wiring board 2, thereby shielding electromagnetic waves.
[0021]
In the assembled state, the shield box 1 is placed at a predetermined position on the wiring board 2 housed in the recess of one housing 3 ′, and is compressed by combining the other housing 3. The height h of the shield box 1 (the height from the upper end of the projection 10 to the lower end of the side wall portion 7 when no stress is applied to the shield box) is between the housing 3 and the ground 4 of the wiring board 2 after the combination. The gap must be larger than the gap, and is preferably about 0.1 to 2 mm larger than the gap between the wiring board 2 and the housing 3. If it is smaller than this, a sufficient amount of compressive displacement cannot be obtained due to undulation, warpage, or variation in the thickness of the housing 3, 3 'or the wiring board 2, and if it is larger than this, the deformation of the shield box 1 will be large. And an excessive load may be generated, which is not preferable.
[0022]
In the assembled state shown in FIG. 5, the top plate 6 is subjected to a compressive stress applied in the height direction of the shield box 1 via the protrusion 10 protruding upward (toward the side opposite to the wiring board 2). (Hereinafter, abbreviated as stress). This stress is absorbed by the top plate 6 being elastically deformed. As described above, since the top plate 6 is elastically deformed, the assembly tolerance between the wiring board 2 and the housing 3 can be absorbed, and the contact load of the lower end of the side wall 7 with respect to the wiring board 2 can be stably secured. Can be. Further, when a stress is applied to the top plate 6 of the shield box 1 via the protrusions 10, the top plate 6 is elastically deformed to absorb a part of the stress, and excessive stress is applied to the side wall 7 and the partition 9. No stress is applied. When the stress is released, the top plate 6 elastically deformed by receiving the stress returns to its original shape elastically.
[0023]
Further, as shown in FIGS. 3 and 4, when the side wall portion 7 is folded outward, rigidity of the lower end portion of the side wall portion 7 is increased, linearity can be secured, and the side wall portion 7 is compressed. Deformation can be suppressed and the lower end of the side wall portion 7 can be reliably connected without deviating from the ground 4. Further, even when only the inner surface side of the shield box 1 is made conductive, the conductive surface can be pressed against the ground 4.
[0024]
In the present invention, the load applied to the lower end of the side wall 7 can be controlled by changing the distance of the projection 10 provided on the top plate 6 from the side wall 7. For example, as shown in FIG. 3, when the protrusion 10 is provided at a position close to the side wall 7, since the top plate 6 between the protrusion 10 and the side wall 7 is short, the amount of elastic deformation of the top plate 6 in this portion is small. Becomes smaller, the load received by the side wall portion 7 near the protrusion 10 locally increases, and the lower end thereof is strongly pressed onto the wiring board 2. On the other hand, as shown in FIG. 4, when the distance between the protrusion 10 and the side wall 7 is long, the top plate 6 between the protrusion 10 and the side wall 7 is long, and the amount of elastic deformation of the top plate 6 is large. As a result, the side wall 7 receives the load almost uniformly, and the lower end of the side end 7 comes into contact with the upper surface of the wiring board 2 with a relatively weak force. Therefore, when the shape of the small room 8 is a shape having few corners such as a square or a square close to a square in plan view, one projection 10 is provided at the center and the distance between the projection 10 and the side wall 7 is reduced. It is made longer so that a uniform load is applied to the lower end of the side wall portion 7. On the other hand, when the small room 8 has a complicated shape, a position where poor contact between the wiring board 2 and the lower end of the side wall portion 7 is expected. The protrusions 10 are provided on the side walls so that the load received by the side wall 7 can be locally increased.
[0025]
When the shield box 1 according to the present embodiment is placed on the top plate 6 and the shield box 1 is placed on the wiring board 2 and housed in the housing 3, the shield box 1 abuts on the inner surface of the housing 3 and elastically deforms the top plate 6. Since the projection 10 to be deformed is provided, the top plate 6 is elastically deformed in the assembled state, so that the assembly tolerance between the wiring board 2 and the housing 3 can be absorbed, and the side wall 7 with respect to the wiring board 2 can be absorbed. The contact load at the lower end can be secured stably.
Further, by changing the distance between the protrusion and the side wall, the contact load of the lower end of the side wall 7 with respect to the wiring board 2 can be controlled, and the adjustment of the contact load becomes easy in design.
[0026]
The present invention also provides a shield box mounting structure that uses the above-described shield box 1 to surround the electronic circuit 5 on the wiring board 2 and shields the electronic circuit 5 from electromagnetic waves. According to the mounting structure of the present invention, the shield box 1 is placed on the wiring board 2 so as to surround various electronic circuits 5 of the wiring board 2 housed in the housings 3 and 3 ′. By combining 3 ′, the housing box is housed inside the housings 3 and 3 ′, and the top plate 6 of the shield box 1 is pressed by the inner surfaces of the housings 3 and 3 ′ facing the wiring board 2. Then, the shield box 1 is pressed against the wiring board 2.
[0027]
The shield box 1 may be placed on the wiring board 2 and combined with the casings 3 and 3 'as they are, or may be temporarily fixed with an adhesive tape before combining the casings 3 and 3'. When the partition 9 of the shield box 1 is formed by folding the film, the ribs of the housings 3 and 3 ′ are fitted into the recesses of the partition 9 and temporarily fixed. You may.
[0028]
When the projection 10 of the top plate 6 is pressed by the inner surface of the housing, the top plate 6 is elastically deformed to absorb the pressing force, and the end of the side wall 7 and / or the partition 9 is connected to the wiring board 2. The electronic circuit 5 on the wiring board 2 connected to the ground 4 is covered with a shield box 1, and is wrapped with a metal foil on another layer of the shield box 1 and the wiring board 2, thereby shielding the electronic circuit from electromagnetic waves.
According to the mounting structure of the present invention, the shield box 1 is placed on the wiring board so as to surround the electronic circuit 5 on the wiring board 2 housed inside the housing 3, 3 '. The electronic circuit 5 can be simply and reliably shielded from electromagnetic waves simply by combining '.
[0029]
【The invention's effect】
As described above, when the shield box of the present invention is placed in the top plate and the shield box is placed on the wiring board and accommodated in the housing 3, the top box is elastically deformed by contacting the inner surface of the housing. Since the top plate is elastically deformed in the assembled state, the assembly tolerance between the wiring board and the housing can be absorbed, and the contact load of the lower end of the side wall with respect to the wiring board can be stabilized. Can be secured.
Further, by changing the distance between the protrusion and the side wall, the contact load of the lower end of the side wall with respect to the wiring board can be controlled, and the adjustment of the contact load becomes easier in design.
[0030]
Further, according to the mounting structure of the shield box of the present invention, the shield box is placed on the wiring board so as to surround various electronic circuits of the wiring board housed in the housing, and the housing is simply combined. Thus, the electronic circuit can be easily and reliably shielded from electromagnetic waves.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an electronic device incorporating a shield box.
FIG. 2 is a perspective view of a shield box showing one embodiment of the present invention.
FIG. 3 is a sectional view taken along the line AA in FIG. 2;
FIG. 4 is a sectional view taken along the line BB in FIG. 2;
FIG. 5 is a cross-sectional view of an electronic device incorporating the same shield box.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Shield box, 2 ... Wiring board, 3, 3 '... Case, 4 ... Ground, 5 ... Electronic circuit, 6 ... Top plate part, 7 ... Side wall part, 8 ... Small room, 9 ... Partition part, 10 ... Protrusions, 11: folded portion, 12: flange portion.

Claims (6)

A top plate portion and a side wall portion hanging down from a peripheral edge thereof, at least one of an inner surface and an outer surface has conductivity, and is disposed on a wiring board housed in a housing and is disposed on the wiring board. A shield box for surrounding an electronic circuit and / or an electronic component, wherein when the shield box is arranged on the wiring board and accommodated in the housing, A shield box provided with a projection for elastically deforming a plate portion. The projection height (h1) of the projection from the top plate is h1 = 0.05 with respect to the height (h) of the shield box from the upper end of the projection of the top plate to the lower end of the side wall when not compressed. The shield box according to claim 1, wherein the shield box has a range of 0.4 to 0.4 h. 2. The shield box according to claim 1, wherein a height (h) of the shield box from an upper end of the protrusion of the top plate portion to a lower end of the side wall portion when not compressed is 1 to 3 mm. The shield box according to any one of claims 1 to 3, wherein the shield box is formed from a synthetic resin sheet having a shear modulus of 10 ⁵ to 10 ¹⁰ Pa. A plurality of small rooms having the top plate portion and the side wall portion are continuously provided via a partition portion, and the projection is provided on a top plate portion of each of the small rooms. The shield box according to claim 1. The shield box according to any one of claims 1 to 5 is housed inside a housing housing a wiring board therein, and a projection provided on a top plate portion of the shield box is pressed by an inner surface of the housing, A mounting structure for a shield box, wherein an electronic circuit on the wiring board is covered with a shield box to shield electromagnetic waves by pressing a lower end of a side wall portion against the wiring board.

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