JP2017059575A - Electromagnetic shielding window unit and electromagnetic shield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic shield capable of performing various kinds of inspections on a wireless communication device.SOLUTION: An electromagnetic shielding window unit 12 includes: a plurality of electromagnetic shielding windows 120A, 120B arranged in a spaced manner; conductive members 122A, 122B arranged on the periphery of the respective electromagnetic shielding windows 120A, 120B through which currents on the basis of electromagnetic waves propagated to each of the respective electromagnetic shielding windows 120A, 120B flow; and a housing 128 that specifies positions of the respective electromagnetic shielding windows 120A, 120B and makes the currents flowing through the conductive members 122A, 122B flow through a housing to be mounted of the electromagnetic shielding window unit 12.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electromagnetic shielding window unit and an electromagnetic shielding body, and more particularly to an electromagnetic shielding unit and an electromagnetic shielding suitable for inspection of wireless communication devices including a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a game machine controller, and the like. About the body.

  Patent Document 1 discloses a shield box having a casing having electromagnetic shielding performance and an opening provided at one end, and a lid for placing an object to be measured on the casing and closing the opening of the casing. (Electromagnetic shield) is disclosed. This shield box has at least one U-shaped groove on the entire circumference of the opening or the lid, a partition plate provided in the opening or the lid and fitted in the U-shaped groove to form a radio wave maze, and the U-shaped groove. A conductive member having elasticity provided at the bottom, the inner surface, or the entrance of the U-shaped groove, and the conductive member is provided at a position that blocks each passage of the radio wave maze formed by the U-shaped groove and the partition plate. ing.

  This type of shield box is used to input a signal from the outside of the shield case to the mobile phone or various wireless devices housed in the shield case body via a cable or the like, and whether the output from the mobile phone is a predetermined one. By determining whether or not, the built-in program of the mobile phone or various wireless devices can check whether or not the required operation can be realized.

Some shield boxes include a window for viewing the display of a mobile phone housed inside the shield box main body from the outside. For example, according to the shield box disclosed in Patent Document 2 For example, a predetermined inspection can be performed while browsing the display of the mobile phone housed inside the shield box body.
JP-A-2005-252015 Japanese Patent No. 4218975

  However, the shield box disclosed in Patent Document 1 can only perform a fixed signal input to the mobile phone housed in the shield case body. For this reason, for example, the inspection of the built-in program of the mobile phone is limited.

  Although the shield box disclosed in Patent Document 2 also requires a sufficient shielding effect and does not interfere with normal inspection, on the other hand, it can withstand inspection that requires more strictness. The development of was awaited. This is because when the window for providing internal visibility is provided in the shield box, the shielding effect is reduced as compared with the case where no window is provided.

  For example, there is an empirical rule that bugs in a built-in program of a mobile phone are likely to be found when an unexpected input is made by a user. For example, there is a case where the power of the cellular phone is turned off when attempting to convert a sentence composed of a predetermined character string into Kanji.

Therefore, it is difficult to find bugs simply by inputting a fixed signal to the mobile phone. In other words, when the shield box disclosed in Patent Document 1 is used, only the inspection deviating from the user's actual key operation can be performed, and thus the inspection result in accordance with the actual situation cannot be obtained.
On the other hand, as disclosed in Patent Document 2, when a window is provided in a shield box, a portion corresponding to the window is shielded by a shield glass instead of a metal casing. As a result, the shielding effect is reduced as compared with the case of shielding with a metal casing.

In addition to the built-in program, the mobile phone has various inspection targets. The inspection target includes, for example, a key touch feeling. Even if the shield box disclosed in Patent Document 1 is used, this type of inspection cannot be performed. Therefore, when the shield box disclosed in Patent Document 1 is employed, a wide variety of inspections must be performed separately.
Such a decrease in shielding effect can be mitigated by using a shielding glass as the window glass, but there is still room for improvement.

  Therefore, in view of the above circumstances, an object of the present invention is to provide a shield box or other electromagnetic shield that is more excellent in shielding effect while having internal visibility.

In order to solve the above problems, the present invention provides an electromagnetic shielding window unit according to the present invention,
A plurality of spaced electromagnetic shielding windows;
A conductive member that is located at a peripheral portion of each electromagnetic shielding window and through which a current based on radio waves propagated to each electromagnetic shielding window flows;
A window frame that regulates the position of each electromagnetic shielding window and allows a current flowing through the conductive member to flow through a housing to which the electromagnetic shielding window unit body is attached.

  The electromagnetic shielding window unit of the present invention can be provided in an electromagnetic shielding body including a shield box, a bag-shaped electromagnetic shielding body, a window in a shield room, or the like.

  The said shielding member is good to be detachable with respect to an opening part from a viewpoint of the handling at the time of conveyance and the shielding efficiency of an electromagnetic shielding body. However, when the shielding member is removed or the shielding member is accommodated in the electromagnetic shielding body through the opening, electromagnetic waves will enter and exit from the opening unless care is taken. Therefore, a shielding shutter that closes the opening is provided. Good.

  The window frame may have portions for receiving the bottom surface, the side surface, and the top surface of each electromagnetic shielding window.

The electromagnetic shield of the present invention is
The electromagnetic shielding window unit;
An opening for inserting a hand to manually operate an electronic device housed in the electromagnetic shield body;
A substantially cylindrical and flexible shielding member attached to the opening and through which an arm passes;
Is provided.

Furthermore, the electromagnetic shield of the present invention is
It has an opening for inserting a hand to manually operate an electronic device housed inside,
It is a substantially cylindrical shape that has flexibility and allows an arm to pass through, and is a bag-shaped electromagnetic shield for inspecting the electronic device.

  According to the present invention, it is possible to inspect a wireless communication device by direct operation by an inspector, so a wide variety of inspections can be performed. In particular, an electronic device including a touch panel, such as a smartphone, does not normally operate unless the tester directly operates with a finger, and thus can be suitably used in such a case.

DETAILED DESCRIPTION OF THE INVENTION

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part.

  FIG. 1 is a perspective view showing an appearance of an electromagnetic shield 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the electromagnetic shield 1 shown in FIG. FIG. 3 is a cross-sectional side view of the electromagnetic shield 1 shown in FIG. 1 to 3 includes a casing 11, an electromagnetic shielding window unit 12, an opening 13, a shielding member 14, a mounting table 15, and an electromagnetic wave absorber 16, which will be described below. I have. FIG. 2 also shows a tablet 17 that is a wireless communication device for easy understanding.

  The casing 11 includes a first casing 11a on which a wireless communication device is placed, and a second casing 11b that is hinged to the first casing 11a and functions as a lid. A packing or the like (not shown) is provided between the first housing 11a and the second housing 11b. Note that the wireless communication device includes a mobile phone, a smartphone, a PDA, a game machine controller, various medical sensors for checking the health condition of the human body such as a pulse, a sensor for detecting the posture of the person, and the like.

  The housing | casing 11 consists of electrically conductive materials, such as aluminum processed into plate shape or mesh shape, for example. As the conductive material, in addition to aluminum, metals such as copper, iron, and metal alloys, and non-metallic materials such as conductive rubber and conductive plastic can be employed. Further, it is preferable that the conductive material has a plurality of layers because the shielding efficiency is increased. Although not shown, the housing 11 is selectively attached with an antenna unit that transmits / receives electromagnetic waves to / from the wireless communication device and a cable that propagates electromagnetic waves transmitted / received by the antenna unit. .

  A space surrounded by the first housing 11a and the second housing 11b, that is, the inside of the housing 11 is a housing space for housing the wireless communication device to be inspected. In the housing space, the electromagnetic wave absorber 16 and a mounting table for the wireless communication device suitable for reducing the burden of the inspection operator holding the electronic device when the inspection target is a relatively large wireless communication device. 15 are provided.

  In addition, the form of the 1st housing | casing 11a and the 2nd housing | casing 11b is not limited to what has the hinge mechanism shown in figure. That is, for example, the second housing 11b may be pulled out with respect to the first housing 11a.

  Although the specific configuration of the electromagnetic shielding window unit 12 will be described later, it is provided on the upper surface of the second casing 11b. As shown in FIG. 1 and the like, the electromagnetic shielding window unit 12 of the present embodiment is required for the casing 11 of the electromagnetic shielding body 1 so that the inspector can easily see the inside of the electromagnetic shielding body 1. It is attached at an angle. However, such an angle is not essential, and the electromagnetic shielding windows 120A and 120B may be attached in parallel with the upper surface of the second housing 11b.

  Further, a lid member 12a for closing the upper part of the electromagnetic shielding window unit 12 is connected to the second casing 11b by a hinge or the like. When the electromagnetic shield 1 is used, the wireless communication device may be inspected while opening the lid member 12 a and browsing the display of the wireless communication device accommodated in the electromagnetic shield 1.

  Of course, when the lid member 12a is opened, the shielding efficiency is relatively lower than when the lid member 12a is closed. Therefore, wireless communication such as RF measurement inspection is possible. In the case of an inspection in which there is no need to operate the device, the wireless communication device can be inspected by closing the lid member 12a.

  The opening 13 is provided as a set in the first housing 11a. The opening portion 13 is a portion into which a radiographing device in the electromagnetic shield 1 is inserted in order for an inspection operator to manually operate the wireless communication device. The shape of the opening 13 may be round or square. The size of the opening 13 is preferably about 8 to 10 cm in diameter in the case of a round shape, and about 8 cm × 10 cm in the case of a square shape. Note that a plurality of openings 13 may be provided, and the positions where the openings 13 are provided are not limited to those shown in the figure. For example, the openings 13 are provided on the right side surface and the left side surface of the first housing 11a, respectively. May be.

  The shielding member 14 prevents electromagnetic waves inside and outside the electromagnetic shield 1 from leaking from the opening 13. The shielding member 14 may be detachable from the first housing 11a or may be fixed. The connection between the shielding member 14 and the first housing 11a will be described later. The shape of the first housing 11 a is cylindrical, and the inspector can operate the wireless communication device in the electromagnetic shield 1 through the cylinder and the opening 13. In addition, the cylindrical shape in this specification is not limited to a round cross section, and includes an angular shape.

  Note that FIG. 1 and the like merely show the shielding member 14 schematically. Actually, the shielding member 14 takes into account the difference in arm length for each inspector, and the electromagnetic shielding accuracy. It has a bellows structure to improve the performance. As the shielding member 14, a flexible member is used so that the inspector can easily operate the wireless communication device in the electromagnetic shield 1.

  Specifically, the shielding member 14 has a cloth shape in which a metal thread plated with aluminum, stainless steel, nickel, or the like, a plastic fiber deposited with nickel, or the like is woven. However, conductive rubber, conductive plastic, or the like may be used as the shielding member 14. At this time, a gap is not generated between the arm and the shielding member 14 when the examiner inserts his / her hand into the opening 13. In this way, electromagnetic shielding from the gap can be prevented.

  The shielding member 14 has a length of about 10 cm to 50 cm and an outer periphery of about 40 cm. When the thickness of the shielding member 14 is not sufficient, or when the fineness of the shielding member 14 is not sufficient, a plurality of shielding members 14 such as two to four overlapping members may be provided. In such a case, the innermost shielding member 14 may be made of a relatively soft material in order to improve the touch. The shielding member 14 may be 20 cm, which is a length in which an end is located above the elbow of the inspector when the inspector inspects the wireless communication device. This is because electromagnetic shielding from between the arm and the shielding member 14 can be prevented.

  Further, a shielding shutter that functions as a lid for the opening 13 when the shielding member 14 is removed from the first housing 11 a may be provided in the vicinity of the course opening portion 13. The shielding shutter may be hinged to the first housing 11a, for example.

  In the case of an inspection that does not require operation of a wireless communication device, such as an RF measurement inspection, the shielding member 14 is removed from the first housing 11a, or the shielding member 14 is accommodated in the first housing 11a. Then, it is possible to inspect the wireless communication device by closing the shielding shutter.

  FIG. 4 is a perspective view showing the configuration of the electromagnetic shielding window unit 12 shown in FIG. In FIG. 4, for convenience of explanation, a part of the electromagnetic shielding window unit 12 is cut away. As shown in FIG. 4, the electromagnetic shielding window unit 112 includes electromagnetic shielding windows 120A and 120B, conductive members 122A and 122B, window receiving portions 124A and 124B, ground portions 126A and 126B, which will be described below. And a body 128.

  The electromagnetic shielding windows 120A and 120B are glass coated with a metal film and glass sandwiched with a conductive metal mesh. The electromagnetic shielding window 20A and the electromagnetic shielding window 20B may be different or the same. In this embodiment, as the electromagnetic shielding windows 120A and 120B, for example, TEND57600 Emica (electromagnetic shielding material) manufactured by Takiron is employed. Note that the distance between the electromagnetic shielding window 20A and the electromagnetic shielding window 20B is not limited, and may be, for example, several mm to several cm.

  The conductive members 122A and 122B are copper tapes that are conductive members attached to the peripheral portions of the electromagnetic shielding windows 120A and 120B. As the copper tape, for example, 224512MM manufactured by Sumitomo 3M Co. or equivalent may be adopted. In the electromagnetic wave shielding window unit 112, the conductive members 122A and 122B are electrically connected to conductive meshes or metal films provided in the electromagnetic shielding windows 120A and 120B, respectively. Therefore, the current based on the radio waves propagated to the electromagnetic shielding windows 120A and 120B flows to the conductive members 122A and 122B through the conductive metal mesh of the electromagnetic shielding windows 120A and 120B.

  The window receiving portions 124A and 124B are portions that receive the bottom surfaces of the electromagnetic shielding windows 120A and 120B and are electrically connected thereto. The window receiving portions 124A and 124B in the present embodiment are a pair of inward flanges projecting inward from positions separated from each other on the inner wall of the casing 128 of the electromagnetic shielding window unit 12 described later. In the present embodiment, the window receiving portions 124A and 124B are integrally formed with the housing 128, but may be connected as separate members.

  For example, the upper surfaces of the window receiving portions 124A and 124B can have substantially the same size as the bottom surfaces of the conductive members 122A and 122B. In this case, the window receiving portions 124A and 124B are in contact with the peripheral portions of the electromagnetic shielding windows 120A and 120B, that is, the conductive members 122A and 122B, and receive the conductive members 122A and 122B.

  Note that the window receiving portions 124A and 124B are preferably provided in parallel to each other in order to improve internal visibility. In addition, since the longer distance between the window receiving portions 124A and 124B generally has the function of a penetrating tube, the electromagnetic wave shielding property is improved. However, considering the size of the electromagnetic shielding body 1, It is preferable that the distance is 1 mm to 100 mm.

  The ground portions 126A and 126B are positioned in such a manner that they are in contact with the peripheral portions of the upper surfaces of the electromagnetic shielding windows 120A and 120B, that is, the upper surfaces of the conductive members 122A and 122B and are electrically connected to the inner wall of the casing 128. There is a ground. For this reason, the current that has reached the conductive members 122A and 122B flows to the housing 128 indirectly via the ground portions 126A and 126B or directly without passing through the ground portions 126A and 126B.

  Note that the electromagnetic shielding windows 120A and 120B, the conductive members 122A and 122B, the ground portions 126A and 126B, and the window receiving portions 124A and 124B have a number of screw holes through which screws or the like (not shown) are inserted at corresponding positions. And are integrally fixed through the screw. As a result, the current flowing through the metal mesh or the like of the electromagnetic shielding windows 120A and 120B flows through the screws to the conductive members 122A and 122B, the ground portions 126A and 126B, and the window receiving portions 124A and 124B.

  In the present embodiment, the casing 128 is attached to the inner wall in such a manner that the side surfaces of the electromagnetic shielding windows 120A and 120B are electrically connected via the conductive members 122A and 122B. 11 is also electrically connected. The casing 128 has a rectangular tube shape that is open at both ends (upper and lower ends in FIG. 4) and has a length that allows the electromagnetic shielding windows 120A and 120B to be spaced apart from each other. It can be made of metal such as aluminum, copper, iron, metal alloy, conductive rubber, or the like. Therefore, the current that has reached the casing 128 by following each of the above paths flows toward the casing 11 that is the attachment target. Note that the window frame in the present embodiment is composed of the window receiving portions 124A and 124B, the ground portions 126A and 126B, and the housing 128, but defines the positions of the electromagnetic shielding windows 120A and 120B and the conductive members 122A, The present invention is not limited to this as long as the current flowing through 122B can be passed through the casing 11 to which the electromagnetic shielding window unit main body 12 is attached.

  In the present embodiment, two electromagnetic shielding windows 120A and 120B are provided, and each of them is provided with respect to the conductive members 122A and 122B, the window receiving portions 124A and 124B, the ground portions 126A and 126B, and the housing 128. Therefore, since a large amount of current can flow from the electromagnetic shielding windows 120A and 120B to the outside, an excellent shielding effect can be obtained.

  Furthermore, the electromagnetic shielding window unit 12 in this embodiment is attached so as to be inclined with respect to the bottom surface of the first housing 11a. For this reason, when the inspection operator manipulates the inspection object stored in the electromagnetic shielding body 1 through his / her arm on the shielding member 14, the line of sight can be maintained substantially perpendicular to the electromagnetic shielding windows 120A and 120B. it can.

  Therefore, according to the present embodiment, even if the two electromagnetic shielding windows 120A and 120B are spaced apart from each other, sufficient internal visibility can be ensured if necessary, thereby enabling a smooth and accurate inspection. In addition, as an angle to incline, 0 degree-90 degree | times are preferable, and generally 20 degree-30 degree | times are more preferable. It should be noted that this angle is determined by the size of the electromagnetic shield 1 and the size of the inspection target, and other angles may be preferable in some cases.

  FIG. 5 is a diagram illustrating a connection state between the shielding member 14 of FIG. 1 and the first housing 11a. FIG. 5A shows a cross-sectional view of the shielding member 14 and the first housing 11a as viewed from the second housing 11b side, and FIG. 5B shows the inside of the first housing 11a. Indicates the state.

  As shown in FIG. 5, the end of the shielding member 14 is positioned in the first housing 11a. And the shielding member 14 and the 1st housing | casing 11a are connected in the position a little from the inside from the said edge part. Here, an example in which the shielding member 14 and the first housing 11 a are fixed is shown. A screw hole 16 is formed in the shielding member 14, the first housing 11 a, and the metal plate 19, and is fixed by the screw 17. However, it may replace with the screw 16 and may be stopped with a conductive adhesive or a conductive tape.

  Moreover, in order to implement | achieve electromagnetic shielding more completely, in this embodiment, the electromagnetic wave absorber 18 is provided between the shielding member 14 and the 1st housing | casing 11a.

  FIG. 6 is a diagram showing a modification of FIG. FIG. 6 shows a connection state between the shielding member 14 and the first housing 11a when the shielding member 14 and the first housing 11a are detachable. In FIG. 6, the insertion part 20 to which the edge part of the shielding member 14 was connected, and the receiving part 24 which receives the insertion part 20 are shown. The insertion portion 20 includes a tapered portion 22, a spring 23 that defines the position of the tapered portion 22, and a stopper 21 that defines the insertion limit of the insertion portion 20.

  When the insertion portion 20 is inserted toward the receiving portion 24, the taper portion 22 is pushed by the receiving portion 24, so that the insertion portion 20 is displaced in the central axis direction of the insertion portion 20. At this time, the spring 23 is contracted by the tapered portion 22. Further, when the insertion portion 20 is inserted until the stopper 21 hits the receiving portion 24, contact between the tapered portion 22 and the receiving portion 24 is avoided, and the tapered portion 22 is inserted into the insertion portion 20 by a restoring force to which the spring 23 extends. Displacement in the outer circumferential direction. In this way, mounting | wearing with the shielding member 14 and the 1st housing | casing 11a is realizable.

  On the other hand, when removing the shielding member 14 and the first housing 11a, first, the tapered portion 22 is pushed down in the central axis direction of the insertion portion 20 in the first housing 11a. Next, the insertion part 20 should just move toward the outer side of the 1st housing | casing 11a, maintaining this state.

  It continues and the typical usage method of the electromagnetic shielding body 1 of this embodiment is demonstrated. First, the examiner attaches the shielding member 14 to the opening 13. Then, the inspector opens the second housing 11b to change the electromagnetic shield 1 from the state shown in FIG. 1 to the state shown in FIG. Then, the inspection operator places the wireless communication device to be inspected in the first housing 11a. At this time, the wireless communication device may be placed in such a manner that the display faces the electromagnetic shielding window unit 12 when the second housing 11b is closed, that is, the display is on the upper side.

  Thereafter, the inspector closes the second housing 11b to change the electromagnetic shield 1 from the state shown in FIG. 2 to the state shown in FIG. As a result, a radio communication device to be inspected is accommodated in the electromagnetic shield 1. The wireless communication device may be turned on or off when accommodated in the electromagnetic shield 1. However, it is preferable to check whether the power supply of the wireless communication device is normally turned on or off in the state of being housed in the electromagnetic shield 1.

  Next, the inspector opens the lid member 12 a so that the wireless communication device in the electromagnetic shield 1 can be seen through the electromagnetic shielding window unit 12. The examiner inserts his / her hand into the electromagnetic shield 1 through the shielding member 14 and the opening 13. Then, when the power of the wireless communication device is turned off, the tester presses the power key to switch the power on.

  After the power of the wireless communication device is switched on, the inspection operator presses various keys of the wireless communication device while browsing the display of the wireless communication device through the electromagnetic shielding window unit 12, and the wireless communication device Inspect whether or not to perform the required operation.

  At this time, if the mobile phone is the target of inspection as a wireless communication device, the mobile phone is inspected so that the numeric keys of the mobile phone are pressed at random, such as inputting characters into the mobile phone and performing kanji conversion. Good. In such a case, the creator of the built-in program of the mobile phone makes it difficult to anticipate input, which is effective in finding bugs. In addition to this, not only bugs can be found, but also the touch feeling of keys and the robustness of keys can be inspected.

  However, by connecting a connector of a cable (not shown) to the connector of the wireless communication device accommodated in the electromagnetic shield 1 and inputting a signal to the wireless communication device from the outside through the cable, the suitability of the built-in program of the wireless communication device is determined. It is also possible to inspect. In such a case, the cable may be passed through the opening 13.

  Thereafter, the inspection practitioner performs an inspection that does not require operation of the wireless communication device, such as an RF measurement inspection, as necessary. At this time, as described above, from the viewpoint of shielding efficiency, the shielding member 14 is removed from the first housing 11a, the opening 13 is closed with the shielding shutter, and the electromagnetic shielding window unit 12 is covered with the lid member 12a. Close it.

  After the inspection of the wireless communication device, the inspection operator turns off the wireless communication device, opens the second housing 11b, and changes the electromagnetic shield 1 from the state shown in FIG. 2 to the state shown in FIG. Thereafter, the wireless communication device placed in the first housing 11a is taken out.

  7-8 is a figure which shows the measurement result of the electromagnetic wave amount in the electromagnetic shielding body 1 periphery. 7 to 8, the horizontal axis represents frequency [Hz], and the vertical axis represents electromagnetic wave attenuation [dB]. This measurement result is measured in a state where the user does not put a hand on the electromagnetic shield 1. The frequency measurement target was set to 2.3 GHz to 2.5 GHz. These measurements were performed using an S-parameter vector network analyzer (product number: ZNB8) manufactured by Rohde & Schwarz.

  In FIG. 7, the measurement result of the electromagnetic wave quantity in the open end vicinity of the shielding member 14 at the time of use of the electromagnetic shielding body 1 is shown. As shown in the figure, the attenuation amount of the electromagnetic wave in this case was 95 [dB] or more. In addition, the part shown as M1 has shown the measurement result of the electromagnetic wave amount in the frequency of 2.4 [GHz], and it turns out that it was about 102 [dB].

  Here, the function of the electromagnetic shield 1 is sufficient if the attenuation amount of the electromagnetic wave is 80 [dB] or more. Therefore, the electromagnetic shielding body 1 of this embodiment has confirmed that the function was fully ensured.

  In addition, in the method of measuring the electromagnetic wave amount, the reference antennas are arranged facing each other inside and outside the electromagnetic shield 1. And before and after sealing the electromagnetic shield 1, if the attenuation of electromagnetic waves is 60 [dB] or more, the mobile phone or the like is theoretically said to be in a so-called out-of-service state.

  However, not only the electromagnetic wave from the reference antenna installed outside the electromagnetic shield 1 but also the electromagnetic wave from other media propagates in the electromagnetic shield 1. In fact, it has been found that the influence of electromagnetic waves from other than the reference antenna reaches the electromagnetic shield 1. For this reason, as a measurement result of the electromagnetic wave amount, it was confirmed that even when the attenuation amount of the electromagnetic wave was 60 [dB] or more, the mobile phone or the like was not out of service.

  Therefore, in the present embodiment, the extent to which the electromagnetic shield 1 is attenuated in the vicinity of the base station including directly under several base stations is a state in which the user puts both hands into the electromagnetic shield 1. As a result of verifying whether or not the cellular phone or the like is in an out-of-service state, it was confirmed that the function is sufficient if the attenuation of electromagnetic waves is 80 [dB] or more as described above.

  FIG. 8 shows measurement results of electromagnetic wave attenuation at various frequencies at arbitrary positions on the surface of the casing 11 of the electromagnetic shield 1 in a state where the electromagnetic shield 1 is not touched. In FIG. 8, the measurement limit of the measuring instrument is also appended with a broken line.

  In this case, the attenuation amount of the electromagnetic wave was 90 [dB] or more at all frequencies M1 to M6. Also, this measurement result is close to the measurement limit of the measuring instrument. It was confirmed that the electromagnetic shield 1 of the present embodiment has no leakage of electromagnetic waves from the electromagnetic shield 1 when used. By the way, the measurement result of the electromagnetic wave amount at the locations indicated as M1 to M6 in the state where the electromagnetic shield 1 is put in was also 90 [dB] or more.

  Note that the locations indicated as M1 to M6 in FIG. 8 are 700 [MHz], 900 [MHz], 1.9 [GHz], 2.4 [GHz], 3.5 [GHz], and 5. The measurement results of the electromagnetic wave amount at a frequency of 0 [GHz] are shown, and are approximately 105 [dB], approximately 116 [dB], approximately 112 [dB], approximately 105 [dB], approximately 104 [dB], respectively. It was about 99 [dB].

  FIG. 9 is a diagram showing a modification of FIG. FIG. 9 is a diagram showing an electromagnetic shielding member 14 that can be suitably used for a wireless communication device such as a mobile phone, a smartphone, a tablet, a PDA, and a remote controller.

  9 shows an antenna unit 30 that transmits and receives electromagnetic waves to and from a wireless communication device attached to, for example, an end of the electromagnetic shielding member 14, a cable 31 that propagates electromagnetic waves transmitted and received by the antenna unit 30, and an electromagnetic shielding window. The electromagnetic shielding window 12a of the unit 12 is shown.

  The electromagnetic shielding member 14 may be provided with a cable that is inserted into and removed from a connector such as the smartphone 17 instead of the antenna unit 30 and the cable 31.

  In the case of a wireless communication device such as the smartphone 17, it is not always necessary to include the box-shaped electromagnetic shield 1 as shown in FIG. In such a case, it is sufficient that the inspection operator holds the wireless communication device and inserts an arm into the electromagnetic shielding member 14 to perform the inspection. The electromagnetic shielding member 14 may have a length of about 10 cm to 50 cm and an outer periphery of about 40 cm.

  Since the electromagnetic shielding body 1 of the present embodiment has an excellent shielding effect, it can be used for digital forging. In particular, it is possible to carry an electromagnetic wave of 90 [dB] or more regardless of the frequency band without preparing a facility such as a large shield room, so it can be carried on a patrol car or the like. When a problem occurs, seize the suspect's mobile phone, etc., and browse the information stored in the mobile phone etc. on the spot while erasing evidence from the outside or tampering with information It becomes possible to do.

  The present invention can be used when inspecting and driving a wireless communication device and an information processing apparatus.

It is a perspective view showing an outline of electromagnetic shielding object 1 of an embodiment of the present invention. It is sectional drawing of the electromagnetic shielding body 1 shown in FIG. It is a cross-sectional side view of the electromagnetic shielding body 1 shown in FIG. It is a perspective view which shows the structure of the electromagnetic shielding window unit 12 shown in FIG. It is a figure which shows the connection state of the shielding member 14 of FIG. 1, and the 1st housing | casing 11a. It is a figure which shows the modification of FIG. It is a figure which shows the measurement result of the electromagnetic wave amount in the electromagnetic shielding body 1 periphery. It is a figure which shows the measurement result of the electromagnetic wave amount in the electromagnetic shielding body 1 periphery. It is a figure which shows the modification of FIG.

DESCRIPTION OF SYMBOLS 1 Electromagnetic shielding body 11 Electromagnetic shielding body 12 Electromagnetic shielding window unit 13 Opening part 14 Shielding member

Claims (5)

A plurality of spaced electromagnetic shielding windows;
A conductive member that is located at a peripheral portion of each electromagnetic shielding window and through which a current based on radio waves propagated to each electromagnetic shielding window flows;
An electromagnetic shielding window unit comprising: a window frame that regulates a position of each electromagnetic shielding window and causes a current flowing through the conductive member to flow to a housing to which the electromagnetic shielding window unit body is attached.   The electromagnetic shielding window unit according to claim 1, wherein the window frame includes a portion for receiving a bottom surface, a side surface, and an upper surface of each electromagnetic shielding window. The electromagnetic shielding window unit according to claim 1,
An opening for inserting a hand to manually operate an electronic device housed in the electromagnetic shield body;
A substantially cylindrical and flexible shielding member attached to the opening and through which an arm passes;
An electromagnetic shield comprising: The electromagnetic shielding window unit according to claim 1,
It has an opening for inserting a hand to manually operate an electronic device housed inside,
A bag-shaped electromagnetic shielding body that is flexible and has a substantially cylindrical shape that allows an arm to pass therethrough, and is used to inspect the electronic device.   The electromagnetic shielding body according to claim 3 or 4, wherein the electronic device is a wireless communication device or an information processing device.