JP2009105598A - Signaling top plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a signaling top plate enabling a plurality of communication devices to transmit signals to each other by disposing the communication devices nearby a surface and nearby an aperture or cut of a backside. <P>SOLUTION: The signaling top plate is constituted such that a communication sheet 101a is arranged having a communicable mesh surface on a side which does not come into contact with a top plate 301, a communication sheet 101b is arranged having a communicable mesh surface on a side which comes into contact with the top late 301 to cover the aperture 302, and a communication device arranged on the communication sheet 101a on the surface of the top plate 301 and an interface device disposed nearby the communication sheet 101b are enabled to communicate with each other through the aperture 302 from the backside of the top plate 301. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a signal transmission top plate that enables signal transmission between communication devices by arranging a plurality of communication devices in the vicinity of a front surface or in the vicinity of a hole or notch on the back surface.

Conventionally, there are two sheet shapes (cloth shape, paper shape, foil shape, plate shape, mesh shape (typically those having a mesh finer than the electromagnetic wave length of the signal), etc., and have a spread as a surface, (Thin thickness is thin.) The sheet-like insulator is sandwiched between the conductors, and the electromagnetic field can be transmitted between them. In addition, a sheet-like signal transmission device has been proposed in which a signal can be input and output only by arranging an interface of the communication device (with two electrodes arranged at different locations). For example, the technique by the inventors of the present application is disclosed in the following documents.
JP 2007-082178 A

  In the technique disclosed in [Patent Document 1], in a signal transmission device in which a sheet-like conductor and a mesh-sheet-like conductor are arranged to be separated from each other in parallel, an electromagnetic field ( The electromagnetic field between the sheet-like conductor and the mesh-sheet-like conductor changes with the electromagnetic field near the outside of the mesh-sheet-like conductor, and communicates with the interface via a change in the evanescent field). The voltage between them changes according to the electromagnetic field near the outside of the mesh sheet conductor, and communication between the signal transmission device and the interface or between the interfaces via the signal transmission device becomes possible. ing.

  When such a sheet-like signal transmission device is installed on a furniture having a top plate, planarity is required in consideration of convenience when working on the top plate. On the other hand, there is a strong demand for reducing the installation cost of the signal transmission device as much as possible.

  An object of the present invention is to provide a signal transmission top plate that enables signal transmission between communication devices by disposing a plurality of communication devices in the vicinity of the front surface or in the vicinity of the opening or notch on the back surface.

  In order to achieve the above object, the following invention is disclosed in accordance with the principle of the present invention.

  A signal transmission top plate according to a first aspect of the present invention includes a top plate having an opening or a notch penetrating from the front surface to the back surface, a first sheet-like signal transmission device installed on the top surface of the top plate, and the top plate A second sheet-shaped signal transmission device installed on the surface of the first sheet-shaped signal transmission device so as to cover the opening or notch and to be in contact with the peripheral edge of the first sheet-shaped signal transmission device. Each of the apparatus and the second sheet-like signal transmission device includes a sheet-like conductor sandwiching a sheet-like insulator having a predetermined thickness and a mesh sheet-like conductor, and the first sheet-like signal transmission device. Is installed so that the sheet-like conductor is in contact with the top plate, and the second sheet-like signal transmission device is installed so that the mesh sheet-like conductor is in contact with the top plate and exposed on the back surface. 1 sheet-like signal transmission device and second sheet-like signal A transmission device, transmitting a signal by changing an electromagnetic field between the mesh sheet conductor and the sheet conductor; a first sheet signal transmission device; a second sheet signal transmission device; When the first communication device installed in the vicinity of one of the mesh sheet-like conductors changes the electromagnetic field in the vicinity, the change is transferred to the first sheet-like signal transmission device and the second sheet-like conductor. The signal transmission device transmits between the mesh sheet-like conductor and the sheet-like conductor, and the mesh is any one of the first sheet-like signal transmission device and the second sheet-like signal transmission device. A second communication device installed in the vicinity of the sheet-like conductor detects a change in the electromagnetic field in the vicinity and transmits a signal between the first communication device and the second communication device. Constitute.

  Moreover, in the signal transmission top plate of the present invention, a third sheet-like signal transmission which is installed on the surface of the top plate symmetrically with the first sheet-like signal transmission device with respect to a predetermined center line of the top plate. The opening or notch penetrates from the front surface to the back surface at the center line, and the third sheet-like signal transmission device includes a sheet-like conductor sandwiching the sheet-like insulator having the predetermined thickness, and a mesh A third sheet-like signal transmission device is installed so that the sheet-like conductor is in contact with the top plate, and the periphery of the third sheet-like signal transmission device is the second sheet. At least one of the first communication device and the second communication device is a first sheet-like signal transmission device and a second signal transmission device. One of the sheet-like signal transmission devices of Instead of being placed in the vicinity of Sshushito shaped conductor can be configured to be placed in the vicinity of the mesh sheet-like conductor of the third sheet-like signaling devices.

  A signal transmission top plate according to another aspect of the present invention includes a top plate, a first sheet-like signal transmission device installed on the surface of the top plate, and a peripheral edge of the first sheet-like signal transmission device on the surface of the top plate. The second sheet-shaped signal transmission device is installed so that the peripheral edge is in contact with the first sheet-shaped signal transmission device and the second sheet-shaped signal transmission device. The first sheet-like signal transmission device and the second sheet-like signal transmission device have a sheet-like conductor sandwiching an insulator and a mesh sheet-like conductor. A signal is transmitted by changing the electromagnetic field between the mesh sheet-like conductor and the sheet-like conductor of the first sheet-like signal transmission device and the second sheet-like signal transmission device. A first sheet-like signal transmission device and a second sheet-like signal transmission device. When the first communication device installed in the vicinity of any one of the mesh sheet conductors changes the electromagnetic field in the vicinity, the change is transmitted to the first sheet signal transmission device and the second The sheet-like signal transmission device transmits between the mesh sheet-like conductor and the sheet-like conductor, and one of the first sheet-like signal transmission device and the second sheet-like signal transmission device A second communication device installed in the vicinity of the mesh sheet conductor detects a change in the electromagnetic field in the vicinity and transmits a signal between the first communication device and the second communication device. Configure as follows.

  Moreover, in the signal transmission top plate of the present invention, a third sheet-like signal transmission which is installed on the surface of the top plate symmetrically with the first sheet-like signal transmission device with respect to a predetermined center line of the top plate. A third sheet-shaped signal transmission device, further comprising: a sheet-shaped conductor sandwiching the sheet-shaped insulator having a predetermined thickness; and a mesh sheet-shaped conductor; The sheet-like conductor is installed in contact with the top plate, and the periphery of the third sheet-like signal transmission device is installed in contact with the periphery of the second sheet-like signal transmission device, and the first communication device And at least one of the second communication device is one of the mesh sheet-like conductors of the first sheet-like signal transmission device and the second sheet-like signal transmission device. 3rd sheet signal instead of being installed in the vicinity It can be configured to be installed in the vicinity of the mesh sheet-like conductor of the reach device.

  In the signal transmission top plate of the present invention, the sheet-like conductors of the first sheet-like signal transmission device and the second sheet-like signal transmission device both have the same shape as the mesh sheet-like conductor. It can be configured to be.

  In the signal transmission top plate of the present invention, the signal transmission top plate may be configured such that the sheet-like conductor of the second sheet-like signal transmission device has the same shape as the mesh sheet-like conductor. it can.

  In the signal transmission top plate of the present invention, the top plate includes a first small top plate on which the first sheet-like signal transmission device is arranged and a second small plate on which the third sheet-like signal transmission device is arranged. The small top plate is joined to at least one of the first small top plate and the second small top plate. The sheet-like signal transmission device is configured to be installed so as to cover a notch included in the joint side across the joint side of the first small top plate and the second small top plate. can do.

  In the signal transmission top of the present invention, the communication device that is in proximity to the mesh sheet conductor of the second sheet-shaped signal transmission device includes an interface unit that is proximate to the mesh sheet conductor, and an extension from the interface unit. Cable portion and an access point portion connected to the cable portion, and a change in voltage detected by the interface portion is transmitted to the access point portion via the cable portion and output by the access point portion. It is possible to transmit the change in voltage to the interface unit via the cable unit and perform communication via the signal transmission top plate.

  ADVANTAGE OF THE INVENTION According to this invention, the signal transmission top plate which enables the signal transmission between communication apparatuses can be provided by arrange | positioning a some communication apparatus to the surface vicinity or the opening and notch vicinity of a back surface.

  Embodiments of the present invention will be described below. The embodiments described below are for explanation, and do not limit the scope of the present invention. Therefore, those skilled in the art can employ embodiments in which each of these elements or all of the elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention.

(Communication sheet)
FIG. 1 is a cross-sectional view illustrating the structure of a communication sheet and an interface device used in the present invention. Hereinafter, a description will be given with reference to FIG.

  The communication sheet 101 has a sheet-like shape in which a sheet-like insulator 104 is sandwiched between a sheet-like conductor 102 and a mesh sheet-like conductor 103. Here, “conductor” and “insulator” mean that they function as “conductor” and “insulator” with respect to electromagnetic waves having a frequency used for signal transmission. Therefore, the “conductor” is not necessarily a metal.

  In addition, the “sheet shape” means a material having a wide surface and a thin thickness, such as a cloth shape, a paper shape, a foil shape, a plate shape, and a mesh shape. The “mesh sheet shape” is typically one having a mesh finer than the electromagnetic wave length of the signal, but is not necessarily limited to the mesh, and may be constituted by a technique such as providing a large number of holes in a metal foil, for example. it can. The mesh and the holes are sized so that an evanescent field due to electromagnetic waves in a region sandwiched between the sheet conductor 102 and the mesh sheet conductor 103 is generated outside.

  Although the sheet-like conductor 102 may be a “mesh sheet-like”, for ease of understanding, a typical example in which an evanescent field is generated on one surface will be considered below. It is “foil-like” and has no holes.

  In addition, the entire communication sheet 101 shown in this figure is covered with an insulator film 105, and the insulator film 105 fills the opening portion of the mesh sheet conductor 102 and contacts the sheet insulator 104. ing. Therefore, the sheet-like conductor 102 and the mesh sheet-like conductor 103 are insulated from each other and also from the outside. When the side surfaces of the two communication sheets 101 are brought into close contact with each other, it is desirable that the thickness of the insulator film 105 be thin enough to form an electromagnetic field together.

  It is typical to employ a configuration in which the insulator film 105 is used as a film in advance, but the insulator film 105 is not necessarily required depending on the construction method. For example, a place where the communication sheet 101 is installed (in this embodiment, a desk top plate is assumed) is an insulator, and a decorative board made of an insulator is placed on the communication sheet 101. .

  The interface device 111 is brought close to the surface of the communication sheet 101 on the mesh sheet-like conductor 103 side. In this figure, the two are illustrated with a slight separation in view of ease of viewing, but in practice, they are typically in close contact.

  The interface device 111 has two electrodes 112 a and 112 b and plays a role of drawing an evanescent field from the communication sheet 101. The two electrodes 112a and 112b are connected to various computers via a cable such as the coaxial cable 113.

  Here, if the voltage between the electrodes 112a and 112b is changed, an electromagnetic wave is generated between the sheet-like conductor 102 in the communication sheet 101 and the mesh sheet-like conductor 103, and the sheet-like conductor 102 in the communication sheet 101 If electromagnetic waves are generated between the mesh sheet conductors 103, the voltage between the electrodes 112a and 112b changes.

  The interface device 111 may be embedded in the lower surface side of a portable computer and integrated with the computer, or as a single connector to realize network connection via a USB (Universal Serial Bus) or a PC (Personal Computer) card. It is also possible to connect to a network interface device in the computer via various network cables to enable communication.

  The interface device 111 is integrated with a computer or the like that controls the interface device 111 and functions as a communication device. Thereby, information transmission between the communication apparatuses via the communication sheet 101 becomes possible. These are related to the technique disclosed in [Patent Document 1], and the technique disclosed in the document can be appropriately applied to the present invention.

  FIG. 2 is an explanatory diagram showing a method of connecting a plurality of communication sheets. Hereinafter, a description will be given with reference to FIG.

  In this figure (a), the side surfaces of two communication sheets 101a and 101b having different areas are brought into contact with each other, and the upper surfaces thereof are on the same plane, and are flat as a whole. The communication sheet 101a has a mesh sheet-like conductor 103 on the upper surface side (shown in white in the figure, the same applies hereinafter), and the communication sheet 101b has a sheet-like conductor 102 on the upper surface side (shown in gray in the figure, hereinafter). The same).

  Therefore, in order to perform communication, the interface device 111 may be arranged on the upper surface of the communication sheet 101a or the lower surface of the communication sheet 101b (as described above, the mesh conductor is used as the sheet-like conductor 102). If you use something, you can communicate on either side).

  In the example shown in this figure, since the communication sheet 101a is large and the communication sheet 101b is small, in the top plate provided with an opening or notch for passing a cable such as a power cord, the opening or notch is provided. The communication sheet 101b is disposed so as to cover the communication sheet 101a, the communication sheet 101a is disposed so as to cover most of the top plate, and the interface device 111 is exposed through a hole or a notch in the top plate, and the mesh sheet shape of the communication sheet 101b. It is installed near the conductor 103 and connected to a LAN (Local Area Network).

  Even if the communication sheets 101a and 101b are in contact with each other and the insulator film 105 is present, the sheet of the communication sheet 101a can be used as long as the thickness is sufficiently small compared to the degree of leakage of the evanescent field. The conductor 102 and the mesh sheet conductor 103 of the communication sheet 101b substantially function as one conductor plate, and the sheet conductor 102 of the communication sheet 101b and the mesh sheet conductor 103 of the communication sheet 101b are substantially one conductor. Functions as a board. Therefore, the entire communication sheets 101a and 101b can be considered to function as “one communication sheet”.

  Therefore, when a portable computer incorporating the interface device 111 is brought close to the upper surface side of the communication sheet 101a, the computer can be connected to the LAN.

  This figure (b) is the form which changed the positional relationship of the communication sheets 101a and 101b. As long as both side surfaces are in contact with each other, the positions of both can be changed according to the positions of the holes or notches provided in the top plate.

  FIG. 7C shows an example in which the three communication sheets 101a, 101b, and 101c function as “one communication sheet”. The communication sheet 101a and the communication sheet 101c are substantially the same shape and have the same surface orientation. The communication sheet 101b is connected between them, and as a whole, it is H-shaped.

  This figure (d) cuts the end part of a rectangular communication sheet into a cutout shape to make two communication sheets 101a and 101b from the remaining part and the cut part, and turns one over and fits the whole. Is a rectangular shape.

  This figure (e) cut | disconnects so that an opening may be provided in the center part of a rectangular-shaped communication sheet, makes two communication sheets 101a and 101b from the remaining part and the cutting part, and made it a rectangular type as a whole Is.

  In general, if the cut shape is symmetrical, one communication sheet can be divided into two parts, and one can be turned over and joined.

  Moreover, in the example of this figure (d) (e), although the cut | disconnected part is inserted as it is, cut a cut part further smaller like this figure (f), and it inserts only the one part. It is also good. In this way, an opening 201 is obtained. The opening 201 can be used to pass a power cable or the like, or to attach an outlet such as a power source or various sockets.

  Further, in this figure (f), the small communication sheet 101b is moved to the right in the figure, and only one opening 201 is provided on the left in the figure. For example, the communication sheet 101b is arranged in the center to open the hole. It is also possible to carry out modifications such as providing two outlets and providing outlets on the left and right.

  In each of the examples shown in FIGS. 4A to 4F, the communication sheet has a flat top surface, so that the work efficiency when used as a desk is maintained even when installed on the top panel. Will be.

(Top plate with communication sheet)
Below, the top plate (signal transmission top plate) which installed said communication sheet (signal transmission device) is demonstrated. This top plate can be made into a furniture such as a desk, table, jar, etc. by attaching legs, just like a normal top plate, and the interface device 111 is placed close to the front surface, back surface opening and back surface notch It has a function to transmit a signal simply by making it.

  FIG. 3 is an explanatory view showing an example of a top board provided with a communication sheet.

  This figure (a) shows the positional relationship which it is going to install the communication sheets 101a and 101b shown to Fig.2 (a) in the top plate 301. FIG. The top plate 301 is provided with a small opening 302 at a position corresponding to the communication sheet 101b. This figure (b) shows the positional relationship after installing the communication sheets 101a and 101b on the surface of the top plate 301. The communication sheet 101b covers the opening 302.

  FIG. 4 is an explanatory view showing an embodiment of a top board on which a communication sheet is installed.

  This figure (a) shows the positional relationship which is going to install the communication sheets 101a, 101b, 101c shown in FIG.2 (c) in the top plate 301. FIG. The top plate 301 is provided with a small opening 302 at a position corresponding to the communication sheet 101b. The opening 302 is in the middle of the center line 303 of the top plate 301. This figure (b) shows the positional relationship after communication sheet 101a, 101b, 101c is installed in the surface of the top plate 301. FIG. The communication sheet 101b covers the opening 302.

  This example is a suitable example when a user sits and uses a single top plate facing each other. Near the both ends of the center line 303 of the top plate 301, a partition member 401 (in FIG. A connecting hole 402 is also provided to support

  FIG. 5 is an explanatory view showing an embodiment of a top board on which a communication sheet is installed.

  This figure (a) shows the positional relationship which tries to install the communication sheets 101a and 101b shown in FIG.2 (f) in the top plate 301. FIG. The top plate 301 is provided with a small opening 302 at a position corresponding to the communication sheet 101b. The opening 302 is in the middle of the center line 303 of the top plate 301. This figure (b) shows the positional relationship after installing the communication sheets 101a and 101b on the surface of the top plate 301. The communication sheet 101 b covers the opening 302, and the communication sheet 101 a covers substantially the entire top plate 301.

  This figure (c) shows the method of connecting the additional top boards 501a and 501b to the top board 301, and comprising the top board similar to the aspect shown in FIG.

  Here, if the thickness of the communication sheets 101a and 101b on the top plate 301 is equal to the thickness of the additional top plates 501a and 501b, the surface becomes substantially flat, and various working efficiencies are further improved. I think that.

  Further, in this aspect, the communication sheets 101a and 101b are configured not to have the insulator film 105, and the upper surfaces of the additional top plates 501a and 501b and the communication sheets 101a and 101b may be covered with an insulating decorative plate. Is possible. At this time, the conductor of the mesh sheet-like conductor 103 is exposed as it is in the back surface opening 302 of the top plate 301, but the size of the opening 302 is set so that the interface device 111 just fits. Thus, the conductor can be covered.

  As the top plate 301, a single plate can be used, and a top plate of furniture provided with various openings and notches can be used. In addition, the communication sheet 101b is not turned over, and the mesh sheet-like conductor 103 is installed so that the surface thereof is the upper surface, and the interface device 111 connected to the LAN is installed so that it can be seen on the desk. It may be adopted. Further, when a mesh sheet-like conductor is used as the sheet-like conductor 102, communication is possible regardless of whether the interface device 111 is close to the top plate or the back plate.

  In addition, for the top plate 301 or a combination of the top plate 301 and the additional top plates 501a and 501b, a desk can be configured by appropriately connecting support beams and legs by a known technique. In addition, it is possible to reduce the complexity of installation and routing of the device by providing a hook for installing the interface device 111 and cables on the back side of the opening or notch covered by the communication sheet 101b. become.

  In a company building or the like, desks are widely arranged next to each other. At this time, the side surfaces of the communication sheets 101a on the top board 301 of the desk are in contact with each other so that the heights coincide with each other. It is also possible to connect the communication sheets 101a on the plurality of top plates 301 and use them as “a single communication sheet” as a whole simply by arranging them.

  When there is a difference in the height of the desk, the insulator film 105 of the communication sheet 101a can be removed at its end, and the corresponding sheet-like conductors 102 of the communication sheet 101a are meshed. A connector that sandwiches the communication sheet 101a so as to connect the conductors 103 may be used.

(Position estimation device)
The interface device 111 to be brought close to the mesh sheet conductor 103 of the communication sheet 101a is not only a portable computer as described above, an active IC (Integrated Circuit) card having its own power supply, but also communication. A communication device such as a passive RFID (Radio Frequency IDentification) that performs charging by changing the evanescent field of the sheet 101a and responds to an inquiry through the communication sheet 101a can be provided.

  Such a communication device can be embedded in an employee ID or the bottom of a document box that collects various documents. Therefore, it is possible to detect who is logged in and which document is being used by detecting the RFID embedded in the bottom of the employee ID or document box.

  Since the interface device 111 close to the communication sheet 101b and the computer connected thereto function as a so-called access point, the location of employees and document boxes can be identified in units of access points. That is, it is possible to identify who is on which top (desk) and which document is being viewed on which top (desk).

  On the other hand, in the above embodiment, as the shape of the communication sheet 101a, in many cases, a long rectangular band is adopted, and the size of the top plate may be prepared for use by a plurality of people. sell. In addition, a plurality of communication sheets 101a may be connected with desks adjacent to each other and managed by one interface device 111 (that is, one access point).

  Therefore, in the present embodiment, in response to such a case, it is assumed that a finer position such as an RFID is estimated.

  In general, when using RFID or the like, an access point periodically outputs a signal for inquiring about existence. Then, when the RFID responds, the access point is notified of its presence, and a communication path between the access point and the RFID is established.

  In the present embodiment, a mode is adopted in which a presence confirmation request signal is transmitted from the access point to the RFID, and when the RFID receives this, the presence confirmation response signal is immediately transmitted to the access point.

  Communication is performed between the interface device 111 connected to the access point and the interface device 111 constituting the RFID using electromagnetic waves propagating in an area sandwiched between the communication sheets 101a and 101b. It is considered that the elapsed time from the transmission of the signal until the presence confirmation response signal is received has a linear function relationship with the distance between the two interface devices 111.

  On the other hand, since the shape of the communication sheet 101a is substantially rectangular as described above, if the position where the communication sheet 101b contacts the communication sheet 101a is the end of the communication sheet 101a (for example, FIG. 2D). The interface device 111 connected to the access point is an end portion of the communication sheet 101a. Therefore, the position of the interface device 111 constituting the RFID with respect to the longitudinal direction of the communication sheet 101a can be estimated.

  Prepare by the following actual measurements. That is, a plurality of RFID position candidates in the communication sheet 101a are assumed. Typically, it is set at a plurality of equal intervals in the longitudinal direction of the communication sheet 101a.

  Then, an RFID is arranged for each of the position candidates, and communication between the access point and the RFID is established.

  Thereafter, the presence confirmation request signal and the presence confirmation response signal are exchanged several times between the both, and the average of the elapsed time is measured.

  Then, a plurality of combinations of elapsed time and RFID position are obtained. In this way, the operation is started after the combination data is obtained.

  That is, when the access point detects the presence of the RFID, the presence confirmation request signal and the presence confirmation response signal are exchanged several times between the two, and the average of the elapsed time is measured.

  Then, the combination data and the average of the measured elapsed time are compared, and the position in the nearest data is estimated as the position of the RFID. Alternatively, the position in the measured elapsed time average is interpolated from the combination data (in consideration of the original error, linear interpolation is considered sufficient, but other interpolation methods may be employed). The interpolation value may be used as the estimated position.

  In this way, when the position of the RFID can be estimated, it is possible to monitor the situation in which the employee ID in which the RFID is embedded, the portable computer, or the document box is used.

  In general, if you use a surveillance camera that shoots while changing the orientation by computer control or mechanical settings, a lot of images other than the place you want to pay attention will be taken, and the place you want to pay attention will be buried in it. The problem arises. In addition, since a low-necessity image is stored in a hard disk or the like, there is a problem that the storage area is compressed.

As mentioned above, if the position of RFID can be estimated,
(1) If the direction of the surveillance camera can be changed by software control, the direction of the camera is positively changed in the direction of the RFID position to perform shooting. When there are a plurality of RFIDs, the direction of the camera is controlled so that the positions of the RFIDs are sequentially traced at regular intervals. Or
(2) If the orientation of the surveillance camera is determined by mechanical settings and cannot be changed, the orientation of the camera changes at a constant cycle. Therefore, information about where the position to be photographed is prepared in the cycle is prepared in advance. Of the images taken by the camera, only those taken at the time when the camera was facing in the direction of the position where the RFID was detected are stored in a hard disk or the like.
Such control is possible.

  FIG. 6 is a schematic diagram illustrating a schematic configuration of a monitoring apparatus that performs the above-described processing. The monitoring device functions as a position estimation device as a whole when used in combination with the signal transmission top plate and a communication device such as an RFID.

  In the monitoring device 601, the interface device 111 is disposed in the opening of the top plate 301 and close to the mesh sheet conductor 103.

  A coaxial cable 113 extending from the interface device 111 is connected to a network interface card (NIC) 602 that is in charge of it.

  The transmission / reception unit 603 establishes communication with the RFID via the NIC 602, transmits a presence confirmation request signal, and receives a presence confirmation response signal.

  The time difference measuring unit 604 measures the average of the time differences between the transmission of the presence confirmation request signal and the reception of the presence confirmation response signal.

  The position information storage unit 605 stores a plurality of sets of representative values of time differences and positions.

  The position estimation unit 606 estimates the RFID position by comparing the average of the time differences measured by the time difference measurement unit 604 with the information stored in the storage unit 605 as the position information.

  The shooting control unit 607 moves the camera 608 to the estimated RFID position to perform shooting, or performs shooting at the moment when the camera 608 is directed to the estimated RFID position. The image information is stored in the image information storage unit 609.

  Here, the transmission / reception unit 603, the time difference measurement unit 604, the position estimation unit 606, and the imaging control unit 607 are generally realized by a CPU (Central Processing Unit) executing a predetermined program.

  The position information storage unit 605 and the image information storage unit 609 are generally realized by a hard disk or the like.

  FIG. 7 is an image diagram of the monitoring system. Hereinafter, a description will be given with reference to FIG.

  A band-shaped communication sheet 101 a and a communication sheet 101 b are installed on the top plate 301 of the desk, and the communication sheet 101 b is connected to the monitoring device 601 through an opening (not shown) at the end of the top plate 301. It is connected.

  On the communication sheet 101 a, the employee ID 701, the document box 702, and the computer 703 are placed in this order as viewed from the communication sheet 101 b. Therefore, the time difference between the transmission of the presence confirmation request signal and the reception of the presence confirmation response signal becomes longer in this order.

  The camera 608 of the monitoring device 601 is installed in the sky and photographs the top plate 301.

  By adopting such an embodiment, it is possible to appropriately monitor the usage status while reducing the amount of hard disk usage.

  It should be noted that other usage authority management systems and this system can be used simultaneously.

  For example, by using the signal transmission top plate of the present embodiment on the shelf of the locker in which the document box is put, it is possible to monitor whether the document box is in the locker or taken out. .

  Also, when an employee wants to view a document box, after using the employee ID to notify the usage authority management system, the document box is taken out of the locker and placed on his desk.

  At this time, it is confirmed by the above position estimation whether or not your employee ID card or the computer that you are using is registered in the usage rights management system is located near the document box. If these places are far away, it is determined that the use situation of the employee is inappropriate, and a warning message or a warning mail is issued.

  Hereinafter, various modifications of the above embodiment will be described.

  In the above embodiment, the top plate 301 to which the communication sheets 101a and 101b are attached is mainly composed of a single plate, but the top plate 301 is joined to a plurality of small top plates to which the communication sheets are attached at its sides. It is also possible to configure by doing so.

  FIG. 8 is an explanatory diagram for explaining the configuration of a signal transmission top plate formed by joining a plurality of small top plates to which communication sheets are attached at their sides. Hereinafter, a description will be given with reference to FIG. In this figure, the thickness of the communication sheet is ignored for easy understanding.

  This figure (a) shows the mode before joining. On the small top plate 801a, a communication sheet 101a having an area smaller than that of the small top plate 801a is attached so as to expose the surface on the mesh sheet-like conductor 103 side.

  On the small top plate 801c, a communication sheet 101c having a smaller area is attached so as to expose the surface on the mesh sheet-like conductor 103 side.

  The small top plates 801a and 801c are provided with notches 802a and 802c on the side where both are joined.

  This figure (b) shows a mode that both were joined. The small top plates 801 a and 801 c are integrated to form the top plate 301, and the notches 802 a and 802 c form the opening 302. Note that it is possible to form the opening 302 even if only one of the notches 802a and 802c is prepared.

  Further, if the small top plate 801a having the notch 802a and the communication sheet 101a attached to the small top plate 801a, and the small top plate 801c having the notch 802c and the communication sheet 101c attached to the small top plate 801a have the same shape, a large amount Production is possible and manufacturing costs can be reduced. In this case, it is desirable that the notches 802a and 802c are arranged at the center of the side where these notches are provided.

  This figure (c) is the completion figure of the signal transmission device. The communication sheet 101b covers the opening 302 and affixes the communication sheet 101b to the top plate 301a so as to contact the sides of the communication sheets 101a and 101c. That is, the communication sheet 101b straddles the joint sides of the small top plates 801a and 801c and covers the notches 802a and 802c. In this example, the communication sheet 101b is pasted so that the surface on the mesh sheet-like conductor 103 side is exposed to the notches 802a and 802c, so that the interface device 111 connected to the access point is the bottom surface of the top plate 301. The communication sheet 101b typically passes through the notches 802a and 802c and is brought close to the mesh sheet conductor 103.

  Note that if the sheet-like conductor 102 of the communication sheet 101b is formed in a mesh sheet shape, the interface device 111 connected to the access point can be arranged on both the front surface (upper surface) and the rear surface (lower surface) of the top plate 301. it can. In this case, since it is possible to easily change the cable connection status, it is suitable for an office where the network configuration can be frequently changed, for example.

  Further, the communication sheet 101b close to the interface device 111 connected to the access point may have a mesh sheet-like conductor 103 on the surface not attached to the top plate 301, like the communication sheets 101a and 101c. In this case, the interface device 111 connected to the access point is arranged on the surface (upper surface) of the desk constituted by the top plate 301. This is suitable when the top plate 301 is not desired to be provided with a notch or an opening.

  As described above, according to the present invention, a signal transmission top plate that enables signal transmission between communication devices by arranging a plurality of communication devices in the vicinity of the front surface or the opening or notch on the back surface. Can be provided.

It is sectional drawing explaining the structure of the communication sheet and interface apparatus utilized in this invention. It is explanatory drawing which shows the method of connecting a some communication sheet. It is explanatory drawing which shows the Example of the top plate which installed the communication sheet. It is explanatory drawing which shows the Example of the top plate which installed the communication sheet. It is explanatory drawing which shows the Example of the top plate which installed the communication sheet. It is a schematic diagram which shows schematic structure of a monitoring apparatus. It is an image figure of a monitoring system. It is a schematic diagram which shows the structure of the signal transmission top plate which concerns on another structure.

Explanation of symbols

101 Communication sheet 102 Sheet-like conductor 103 Mesh sheet-like conductor 104 Sheet-like insulator 105 Insulator film 111 Interface device 112 Electrode 113 Coaxial cable 201 Opening 301 Top plate 302 Opening 303 Center line 401 Partition member 402 Connecting hole 501 Top plate 601 Monitoring device 602 NIC
603 Transmission / reception unit 604 Time difference measurement unit 605 Position information storage unit 606 Position estimation unit 607 Shooting control unit 608 Camera 609 Image information storage unit 701 Employee ID 702 Document box 703 Computer 801 Small top plate 802 Notch

Claims (8)

A top plate having an opening or notch penetrating from the front surface to the back surface
A first sheet-like signal transmission device installed on the surface of the top plate;
A signal transmission top plate comprising a second sheet-shaped signal transmission device that covers the opening or notch on the surface of the top plate and is installed so that the peripheral edge of the first sheet-shaped signal transmission device is in contact with the peripheral edge Because
Each of the first sheet-like signal transmission device and the second sheet-like signal transmission device has a sheet-like conductor that sandwiches a sheet-like insulator having a predetermined thickness, and a mesh sheet-like conductor. ,
The first sheet-shaped signal transmission device is installed so that the sheet-shaped conductor is in contact with the top plate,
The second sheet-shaped signal transmission device is installed so that the mesh sheet-shaped conductor is exposed to the back surface in contact with the top plate,
A signal is transmitted by changing an electromagnetic field between the mesh sheet conductor and the sheet conductor of the first sheet signal transmission device and the second sheet signal transmission device,
Of the first sheet-like signal transmission device and the second sheet-like signal transmission device, a first communication device installed near one of the mesh sheet-like conductors generates an electromagnetic field in the vicinity. When changed, the first sheet-shaped signal transmission device and the second sheet-shaped signal transmission device transmit the change between the mesh sheet-shaped conductor and the sheet-shaped conductor, and The second communication device installed in the vicinity of one of the mesh sheet-like conductors of the sheet-like signal transmission device and the second sheet-like signal transmission device detects a change in the electromagnetic field in the vicinity. And a signal transmission top plate which transmits a signal between the said 1st communication apparatus and the said 2nd communication apparatus. It is a signal transmission top plate of Claim 1, Comprising:
A third sheet-like signal transmission device installed on the surface of the top plate symmetrically with the first sheet-like signal transmission device with respect to a predetermined center line of the top plate;
The opening or notch penetrates from the front surface to the back surface at the center line,
The third sheet-like signal transmission device has a sheet-like conductor that sandwiches the sheet-like insulator of the predetermined thickness, and a mesh sheet-like conductor,
The third sheet-shaped signal transmission device is installed so that the sheet-shaped conductor is in contact with the top plate,
The peripheral edge of the third sheet-shaped signal transmission device is installed in contact with the peripheral edge of the second sheet-shaped signal transmission device,
At least one of the first communication device and the second communication device includes the first sheet-shaped signal transmission device and the second sheet-shaped signal transmission device. Instead of being installed in the vicinity of one of the mesh sheet-like conductors, the signal transmission top plate is installed in the vicinity of the mesh sheet-like conductor of the third sheet-like signal transmission device. Top board,
A first sheet-like signal transmission device installed on the surface of the top plate;
A signal transmission top plate comprising a second sheet-shaped signal transmission device installed on the surface of the top plate so that the peripheral edge of the first sheet-shaped signal transmission device is in contact with the peripheral edge,
Each of the first sheet-like signal transmission device and the second sheet-like signal transmission device has a sheet-like conductor that sandwiches a sheet-like insulator having a predetermined thickness, and a mesh sheet-like conductor. ,
The first sheet-shaped signal transmission device and the second sheet-shaped signal transmission device are installed so that the sheet-shaped conductor is in contact with the top plate,
A signal is transmitted by changing an electromagnetic field between the mesh sheet conductor and the sheet conductor of the first sheet signal transmission device and the second sheet signal transmission device,
Of the first sheet-like signal transmission device and the second sheet-like signal transmission device, a first communication device installed near one of the mesh sheet-like conductors generates an electromagnetic field in the vicinity. When changed, the first sheet-shaped signal transmission device and the second sheet-shaped signal transmission device transmit the change between the mesh sheet-shaped conductor and the sheet-shaped conductor, and The second communication device installed in the vicinity of one of the mesh sheet-like conductors of the sheet-like signal transmission device and the second sheet-like signal transmission device detects a change in the electromagnetic field in the vicinity. And a signal transmission top plate which transmits a signal between the said 1st communication apparatus and the said 2nd communication apparatus. It is a signal transmission top plate of Claim 3, Comprising:
A third sheet-like signal transmission device installed on the surface of the top plate symmetrically with the first sheet-like signal transmission device with respect to a predetermined center line of the top plate;
The third sheet-like signal transmission device has a sheet-like conductor that sandwiches the sheet-like insulator of the predetermined thickness, and a mesh sheet-like conductor,
The third sheet-shaped signal transmission device is installed so that the sheet-shaped conductor is in contact with the top plate,
The peripheral edge of the third sheet-shaped signal transmission device is installed in contact with the peripheral edge of the second sheet-shaped signal transmission device,
At least one of the first communication device and the second communication device includes the first sheet-shaped signal transmission device and the second sheet-shaped signal transmission device. Instead of being installed in the vicinity of one of the mesh sheet-like conductors, the signal transmission top plate is installed in the vicinity of the mesh sheet-like conductor of the third sheet-like signal transmission device. It is a signal transmission top plate of Claim 1 or 3,
Each of the sheet-like conductors of the first sheet-like signal transmission device and the second sheet-like signal transmission device is a mesh having the same shape as the mesh sheet-like conductor. Top board. It is a signal transmission top plate of any one of Claim 1 to 4,
The signal transmission top plate, wherein the sheet-like conductor of the second sheet-like signal transmission device is a mesh having the same shape as the mesh sheet-like conductor. The signal transmission top plate according to claim 2 or 4,
The top plate has sides of a first small top plate on which the first sheet-like signal transmission device is arranged and a second small top plate on which the third sheet-like signal transmission device is arranged. Joined,
At least one of the first small top plate and the second small top plate has a notch in the joint side,
The second sheet-like signal transmission device is installed so as to cover a notch included in the joint side across the joint side of the first small top plate and the second small top plate. A signal transmission top plate. It is a signal transmission top plate of any one of Claim 1 to 7,
A communication device that is in proximity to the mesh sheet conductor of the second sheet signal transmission device includes an interface unit that is in proximity to the mesh sheet conductor, a cable unit that extends from the interface unit, and a cable unit. A change in voltage detected by the interface unit to the access point unit via the cable unit, and a change in voltage output by the access point unit. A signal transmission top plate, wherein the signal transmission top plate is transmitted to the interface unit via the cable portion and communicates via the signal transmission top plate.

Images