JP2005252015A - Shield box and measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that when a third-generation portable telephone is tested, the invasion of an electromagnetic wave from the outside or the leakage of the electromagnetic wave from inside influences the accuracy of measurement whereby a pressing force is necessarily increased and a gap is necessarily reduced in a conventional electromagnetic wave shielding method, however, a locking mechanism becomes complicated in this case. <P>SOLUTION: The shield box is provided with an outer casing body 120, a front surface panel 101 which serves as a lid body, a locking mechanism for fixing the front surface panel to the outer casing body 120 and an electromagnetic shield provided on the front surface panel and the opening of an inner casing body. The portable telephone 160 is disposed horizontally on a tray 105 fixed to the front surface panel 101 and received into the outer casing body 120 by closing the front surface panel 101 by the locking mechanism whereby an electromagnetic wave shielding atmosphere is obtained by the sealing structure of a U-shape groove. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnetic shield box used for testing the operation of a wireless device such as a mobile phone or a wireless LAN device.

  With recent advances in IT technology, wireless communication between computers using wireless technology and telephone or packet communication using mobile phones are widely used. In mobile phones, with the enhancement of third-generation mobile communication service networks, hybrid mobile phones with the second generation and third-generation mobile phones are spreading. With the spread of such mobile phones, there has been a demand from users to clarify whether transmission and reception of the mobile phone are normal at the time of purchase or use after purchase. For this reason, each sales office has a tester that can easily perform an operation test of a mobile phone at a window.

  The mobile phone test requires a space for testing the mobile phone in a state shielded from surrounding electromagnetic waves so that external electromagnetic waves do not enter the mobile phone antenna or body and adversely affect the test results. An electromagnetic wave shielding box (hereinafter simply referred to as a shielding box) is used.

  As shown in FIG. 7, a conventional shield box 400 includes a metal plate that reflects electromagnetic waves, such as aluminum, as an outer casing 401. The outer casing 401 includes a storage box 410 for storing a mobile phone and the like, and an upper cover 402. A hinge for fixing and four locking rotating plates (406 to 409) are provided. A concave groove is formed over the entire periphery of the opening edge of the storage box 410, and a conductive elastic member is embedded in the concave groove 405. Further, a lid 403 that covers the accommodation box 410 is provided inside the hinged upper cover 402.

  The lid 403 is provided with a convex protrusion that fits into the groove 405 of the storage box 410. The protrusion fits into the groove 405 when the lid 403 is closed, and the tip of the protrusion is The storage box is closed by contacting the elastic member 404. Further, the four locking rotating plates hook the pins of the upper cover to make the pressing force to the elastic member uniform.

Patent No. 3338739

  When testing 3rd generation mobile phones and 2nd generation hybrid mobile phones, intrusion of electromagnetic waves from the outside or leakage of electromagnetic waves from the inside affects the measurement accuracy. While maintaining the pressure, it is necessary to further increase the pressing force to reduce the gap, but there is a problem that the lock mechanism becomes complicated.

  In addition, the conventional electromagnetic shielding box is a hinged top / bottom open / close door that is installed on top of the measuring instrument, making it difficult to put other objects on it and reducing the installation efficiency at the sales office counter. There was a problem.

  In order to solve the above-described problems, a shield box according to the present invention has a case having electromagnetic shielding performance and an opening provided at one end, and an object to be measured placed on the case. In a shield box having a lid that closes the opening, at least one U-shaped groove on the entire circumference of the opening or the lid, and a radio wave maze that is provided in the opening or the lid and fits in the U-shaped groove And 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 a radio wave formed by the U-shaped groove and the partition plate. It is provided in the position which blocks each passage of the maze.

  A shield box according to the present invention includes 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. In the shield box, at least one U-shaped groove is provided on the entire circumference of the lid, and is provided on the opening, and is provided on the outer periphery and the inner periphery of the partition plate that fits in the U-shaped groove and forms a radio wave maze. A conductive member having high elasticity and the conductive member provided at the bottom of the U-shaped groove of the lid, and the conductive member closes each path of the radio wave maze formed by the U-shaped groove and the partition plate. It is provided at a position.

  In the shield box according to the present invention, the conductive member having elasticity is a sponge-like resin or a leaf spring-like finger spring having a metal cloth on the outer periphery.

  The shield box according to the present invention further includes a drawer-type tray for placing the object to be measured in the housing, a lock arm for fixing the lid to the housing, and a lock fitting provided in the housing. From the open state, the lid is fixed to the housing by hooking and locking the lock arm to the lock fitting.

  Furthermore, in the shield box according to the present invention, the mounting direction of the object to be measured is parallel to one side of the rectangle of the opening.

  Furthermore, in the shield box according to the present invention, the measuring device for measuring the characteristics of the object to be measured has the same planar dimension and is provided with a positioning tool for preventing the displacement of the mounted measuring device. .

  Furthermore, the measurement system having the shield box and the measuring instrument according to the present invention is configured such that the shield box is a drawer type, and the characteristics of the object to be measured placed on the tray are measured by the measuring instrument placed on the shield box. It is characterized by.

  Furthermore, in the shield box according to the present invention, the object to be measured is a mobile phone.

  According to the present invention, the conventional concave groove is a U-shaped deep groove, and the electromagnetic shield characteristic is improved by using a radio wave labyrinth, and the structure that does not need to increase the pressing force so much can be achieved, so that the lock mechanism can be simplified. is there. Furthermore, there is a sense of unity as a measurement system, and there is an effect that a shield box with high installation efficiency can be obtained.

  Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  FIG. 1 is an overall perspective view showing an entire electromagnetic wave shielding box according to an embodiment of the present invention. The basic components of the shield box 100 are an outer casing 120 having an inner casing 130, a front panel 101 having a role and design meaning of a lid, and a lock mechanism for fixing the front panel 101 to the outer casing 120. It is. The mobile phone 160 is placed sideways on the tray 105 fixed to the front panel 101, and is housed in the inner casing 130 by closing the front panel 101, thereby realizing an electromagnetic wave shielding environment. Further, the outer casing 120 has four recesses 121 into which the legs (114, 115, the other two are not shown) of the measuring instrument are fitted in order to prevent displacement when the measuring instrument is placed on the upper part. It has a structure that can withstand a load of up to about 147 N (about 15 kgf).

  FIG. 2 is a top view and a side view of the electromagnetic wave shielding box in the first embodiment. In the outer casing 120, an inner casing 130 made of aluminum having a thickness of 1.5 mm that reflects electromagnetic waves and welded to the joint, a lock fitting that fixes the front panel 101 to the outer casing, and an outer casing A connector 111 for connecting the coaxial connector 113 and the coaxial cable 112 connected to the cable to the cable 108 of the inner casing, and legs of the measuring instrument (114 and 115, the other two are not shown). .

  The inner housing 130 includes a tray 105 on which the mobile phone 160 is placed sideways, a pair of slide rails (106, 107) for sliding the tray 105, a conductive finger spring on the outer periphery of the opening, and an inside of the opening. There is a conductive gasket around the circumference.

  The cable 108 connected to the connector 111 of the inner casing is connected to the mobile phone 160, and the mobile phone 160 is held on the tray 105 by a pair of mobile phone guides (161, 162) for preventing displacement. Further, the tray 105 fixes a front panel 101 that serves as a lid for the inner casing. A U-shaped deep groove having a shield structure is provided on the entire periphery of the end of the front panel 101 fixed to the tray 105. The front panel 101 includes a lock arm 102, a lock arm shaft 104 that is fixed to the front panel 101 and can be rotated, and a lock pin 103 provided at the tip of the lock arm.

  FIG. 3 is a structural diagram showing an outline of a shield structure having a U-shaped deep groove in the first embodiment. FIG. 3 is a part of a cross section of the front panel 101, the inner casing 130, and the outer casing 120 cut vertically. In the figure, the upper direction is the upper surface of the shield box, and the lower direction is the inner casing 130 in which the mobile phone 160 is accommodated. An outer casing 120 is fixed to the outside of the inner casing 130.

  In many cases, the performance of the shield for high frequencies is limited by the openings created in the shield. In the opening, an electrical gap generated at the joint of the shield material or the like often becomes a problem. Leakage from such openings increases as the frequency increases, but the frequency at which leakage from elongated gaps increases is thought to be determined by the length, not the width, even for very narrow gaps in the joints of metal plates. Can also cause considerable leakage at unexpectedly low frequencies. EMI gaskets (hereinafter referred to as gaskets) or finger springs are used in this embodiment to close such gaps to ensure electrical continuity and prevent high-frequency leakage and radiation.

  An L-shaped angle 131 is fixed to the inner casing 130, and a conductive gasket 150 is fixed on the L-shaped angle. The opening of the inner housing 130 has a front end portion that is tightly bent in the outer peripheral direction, and a beryllium copper finger spring 152 having a triangular cross section is provided on the outer periphery. In the drawing, the finger springs 152 are triangular for the sake of explanation, but in actuality, the finger springs 152 are in close contact with the front panel 101 and spread by a slit provided on the bottom side, and the height is lowered.

  A tapered U-shaped deep groove is formed on the outer periphery of the front panel 101, and there is a convex portion that contacts the gasket 150 of the inner housing 130. A gasket 151 is embedded in the bottom of the U-shaped deep groove, and a side surface of the U-shaped deep groove comes into contact with a finger spring 152 fixed to the inner housing 130. Similarly, the gaskets 150 and 151 are shown in a cross section before being deformed for the sake of explanation, but they are deformed so as to fill a gap by a pressing force.

  The electromagnetic wave emitted from the mobile phone 160 indicated by an arrow in the figure is largely blocked by the first gasket 150 that closes the gap between the front panel 101 and the inner housing 130, but the electromagnetic wave that has partially leaked is A second gasket 151 that passes through the gap between the front panel 101 and the partition plate forming the opening of the inner casing 130 and is located between the front end of the inner casing 130 and the bottom of the U-shaped deep groove of the front panel 101 If there is an electromagnetic wave that is blocked but cannot be blocked, it passes through the gap between the partition plate of the inner casing 130 and the front panel 101 and is blocked by the finger spring 152 that is the third gasket. In the present embodiment, a triple shield structure is provided by a double gasket and a single finger spring, and sufficient shielding performance for an operation test of a wireless device can be realized.

  In this embodiment, in order to form a radio wave maze, the groove depth is set such that the ratio of the depth of the U-shaped deep groove to the maximum gap between the front panel 101 and the inner housing 130 is about 10 to 1 (about 30 mm). Carried out. Further, in the present embodiment, the single U-shaped deep groove is used. However, in order to further improve the electromagnetic shielding characteristics, a double or triple U-shaped deep groove structure may be used.

  FIG. 4 is a schematic diagram showing an outline of an open state and a closed state of the electromagnetic wave shield box according to the first embodiment. FIG. 4A shows the front panel 101 that is slid and opened by pulling the lock arm 102. At this time, the lock arm 102 is lowered by its own weight. However, when the lock arm 102 is pushed and the front panel 101 is hooked on the lock fitting 109 of the outer casing, the front panel and the double gasket come into contact with each other to fix the lock fitting. When the lock arm 102 is lifted to the position, the double gaskets are uniformly pressed, and when the lock arm 102 is locked at the fixed position, the front panel 101 comes into close contact with the inner housing 130 and the lock arm 102 is held in the horizontal position.

  FIG. 5 is a structural diagram showing the structure of the lock fitting 109 in the first embodiment. In the pair of lock fittings 109, the lock fitting fixing part 117 is fixed to the inner housing 130. When the lock arm 102 is operated and the lock pin 103 of the lock arm 102 moves in the lock groove 116 and locks in the locked position, the front panel 101 is fixed to the inner housing 130 with a force of about 117 N (about 12 kgf). To do. The actual operating force is optimized for the lock arm 102, the lock pin 103, and the lock fitting 109, and can be opened and closed with about a dozen N.

  FIG. 6 is an overall perspective view showing the entire measurement system by the measuring instrument 300 placed on the shield box 100 according to the second embodiment. The conventional electromagnetic shield box has a door with a hinged top / bottom open / close door or a small drawer type that is slightly larger than a mobile phone. The box and the lower stage became measuring instruments and the like, and a computer for data processing or another device could not be further stacked.

  Therefore, in the present embodiment, a recess 121 is provided in the outer casing of the shield box 100, and the leg of the measuring instrument 300 is directly fitted into the recess 121 to prevent the measuring instrument 300 installed on the shield box 100 from slipping down. By making the outer dimensions of the box 100 the same width and depth as the measuring instrument, a sense of unity was given as a measuring system. Further, in consideration of operability, the height of the shield box 100 in which the mobile phone 160 can be attached and the measuring instrument can be operated in the same posture, the power switch 301, the measuring instrument display panel 302, the operating panel 303, the handle 305, and The printer 304 for recording the results is also arranged with the same design concept. Further, in the present embodiment, the measurement of the mobile phone has been described. However, the wireless LAN built in the PC can be measured for each PC and the measurement of other wireless devices from the width of the tray 105, and an antenna is provided inside. Needless to say, a radio wave communication test can be performed.

  From the above, according to the present invention, the U-shaped deep groove at the joint improves the electromagnetic shielding characteristics and the structure that does not require much pressing force. Therefore, the lock mechanism is simplified by a pair of lock mechanisms. Furthermore, there is a sense of unity as a measurement system, and a shield box with high installation efficiency can be obtained.

It is a whole perspective view showing the whole electromagnetic wave shield box in one embodiment concerning the present invention. It is the upper side figure and side view of the electromagnetic wave shield box in 1st Embodiment. It is a block diagram which shows the outline | summary of the shield structure which has a U-shaped deep groove in 1st Embodiment. It is a schematic diagram which shows the outline | summary of the open state and closed state of the electromagnetic wave shield box in 1st Embodiment. It is a block diagram which shows the structure of the lock metal fitting in 1st Embodiment. It is a whole perspective view which shows the whole measurement system with the measuring device mounted in the electromagnetic wave shield box in 2nd Embodiment. It is a schematic diagram which shows the outline | summary of the conventional electromagnetic shielding box.

Explanation of symbols

  100, 400 Shield box, 101 Front panel, 102 Lock arm, 103 Lock pin, 104 Lock arm shaft, 105 Tray, 106, 107 Slide rail, 108 Cable, 109 Lock fitting, 111 Connector, 112 Coaxial cable, 113 Coaxial connector, 114, 115 Leg, 116 Lock groove, 117 Lock bracket fixing part, 120 Outer casing, 121 Recess, 130 Inner casing, 131 L-shaped angle, 150, 151 Gasket, 152 Finger spring, 160 Mobile phone, 161, 162 Mobile phone guide, 300 measuring instrument, 301 power switch, 302 display panel, 303 operation panel, 304 printer, 305 handle, 401 outer casing, 402 upper cover, 403 lid 404 elastic member, 405 concave groove, 406 to 409 locking rotating plate, 410 storage box.

Claims (8)

In a shield box having electromagnetic shielding performance and a housing provided with an opening at one end, and a lid that places an object to be measured on the housing and closes the opening of the housing,
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;
A conductive member having elasticity provided at the bottom of the U-shaped groove, the inner surface or the entrance of the U-shaped groove;
With
The shield box, wherein the conductive member is provided at a position for closing each path of a radio wave maze formed by a U-shaped groove and a partition plate. In a shield box having electromagnetic shielding performance and a housing provided with an opening at one end, and a lid that places an object to be measured on the housing and closes the opening of the housing,
At least one U-shaped groove on the entire circumference of the lid,
A partition plate provided in the opening and fitted in the U-shaped groove to form a radio wave maze;
An electrically conductive member having elasticity provided on an outer periphery and an inner periphery of the partition plate;
The conductive member provided at the bottom of the U-shaped groove of the lid;
With
The shield box, wherein the conductive member is provided at a position for closing each path of a radio wave maze formed by a U-shaped groove and a partition plate. The shield box according to claim 1 or 2,
The shield member characterized in that the conductive member having elasticity is a spongy resin having a metal cloth on the outer periphery or a leaf spring-like finger spring. In the shield box according to claim 2 or 3,
A drawer-type tray that is fixed to the lid and places an object to be measured in the housing;
A lock arm for fixing the lid to the housing;
A lock fitting provided on the housing;
With
A shield box, wherein the lid is fixed to the housing by hooking the lock arm to the lock fitting and locking it from the open state. In the shield box according to any one of claims 2 to 4,
A shield box, wherein the mounting direction of the object to be measured is parallel to one side of the rectangle of the opening. In the shield box according to any one of claims 2 to 5,
A shield box having the same planar dimensions as a measuring instrument for measuring the characteristics of an object to be measured, and provided with a positioning tool for preventing displacement of the mounted measuring instrument. In the measurement system which has the shield box according to claim 6 and the measuring instrument,
A measuring system characterized in that the shield box is a drawer type and the characteristics of the object to be measured placed on the tray are measured by the measuring instrument placed on the shield box. The shield box according to any one of claims 2 to 7,
A shield box, wherein the object to be measured is a mobile phone.