Information communication terminal device and displacement management system

Abstract

Provided are an information communication terminal device, a displacement management system, and the like that are capable of easily detecting a structural problem that is difficult to find by visual observation or simple measurement, and that enable repetitive use and appropriate detection of a displacement amount.　An RFID tag (information communication terminal device) 10 comprises a capacitor, which is a variable capacitor 200, formed of: a first electrode 210 disposed on a sliding surface where the first base material 110 and a second base material 120 slide on a first base material 110; and a second electrode 220 disposed on a sliding surface on the second base material 120. The capacitance of the variable capacitor changes according to an area change based on sliding in a region where the first electrode 210 and the second electrode 220 face each other. The first electrode 210 and the second electrode 220 are formed along a sliding direction indicating the direction of sliding.

Description

Information communication terminal device and displacement management system

[0001] The present invention relates to an information communication terminal device and a displacement management system.

[0002] BACKGROUND ART Concrete has been widely used in structures such as bridges for roads and railways, tunnels, and buildings.

[0003] Furthermore, it is known that structures made of these concretes will develop cracks due to temperature, humidity, or external forces when used for a long period of time. If these cracks are left unchecked, they may lead to serious accidents due to the peeling of walls or the progression of corrosion of internal reinforcing bars, so they must be inspected and maintained regularly.

[0004] Recently, inexpensive RFID tags for crack detection that can reliably detect the presence or absence of such cracks have become known (for example, JP 2019-164396 A).

[0005] However, RFID tags described in JP 2019-164396 A and the like have a structure in which the internal electrical wires are cut off in response to cracks, making them unable to be used repeatedly and sometimes unable to properly detect the amount of displacement.

[0006] The present invention aims to provide an information and communication terminal device and a displacement management system that can easily detect structural problems that are difficult to find by visual inspection or simple measurement, that can be used repeatedly, and that can properly detect the amount of displacement.

[0007] (1) In order to solve the above problem, an information communication terminal device according to a first aspect of the present invention comprises: a first substrate fixedly installed at a first reference position of a first object; a substrate fixedly installed at a second reference position different from the first reference position, or a substrate fixedly installed at a second reference position indicating a given position of a second object different from the first object, the second substrate being installed separately from the first substrate and facing the first substrate; a sliding means that slides at least one of the first substrate and the second substrate in accordance with a displacement of the first reference position and the second reference position while maintaining the opposing state between the first substrate and the second substrate; a variable capacitor formed from a first electrode that is disposed on a sliding surface on the first substrate along which the first substrate and the second substrate slide, and a second electrode that is disposed on a sliding surface on the second substrate, the variable capacitor having a capacitance that changes in accordance with an area change due to the sliding of opposing regions of the first electrode and the second electrode; and a transmitting means formed on either the first substrate or the second substrate, for transmitting, as change information, information indicating a change in capacitance of the variable capacitor due to sliding between the first substrate and the second substrate, wherein the first electrode and the second electrode are formed along a sliding direction indicating a sliding direction.

[0008] (2) In order to solve the above problem, an information communication terminal device according to a second aspect of the present invention comprises: a first substrate fixedly installed on a first object; a second substrate which is a substrate fixedly installed on the first object at a second reference position different from a first reference position, separate and independent from the first substrate, or a substrate fixedly installed at a second reference position indicating a given position of a second object different from the first object; a third substrate which is a substrate fixedly installed on the first object or a second object at a third reference position different from the first and second reference positions, separate and independent from at least the second substrate, or a substrate fixedly installed at a third reference position indicating a given position of a third object different from the first and second objects, and which is fixedly installed facing the first substrate and the second substrate; and sliding means which slide the first substrate, the second substrate, and the third substrate in a first direction and a second direction different from the first direction, while maintaining the opposing states of the first substrate, the second substrate, and the third substrate, respectively. a first capacitor circuit whose capacitance changes with sliding in the first direction; a second capacitor circuit whose capacitance changes with sliding in the second direction; and a transmitting means for transmitting information indicating each of the changes in capacitance of the first capacitor circuit and the changes in capacitance of the second capacitor circuit as change information, wherein the first capacitor circuit is composed of a first electrode for the first capacitor circuit that is disposed on the sliding surface on the first substrate along which the first substrate and the second substrate slide and that is disposed along the first direction, and a second electrode for the first capacitor circuit that is disposed on the sliding surface on the second substrate and that is disposed along the first direction, and has a first capacitor circuit variable capacitor whose capacitance changes with an area change due to sliding in the first direction of opposing regions of the first electrode for the first capacitor circuit and the second electrode for the first capacitor circuit, and wherein the second capacitor circuit isThe variable capacitor has a configuration including: a first electrode for a second capacitor circuit that is disposed on the third substrate at a sliding surface where the second substrate and the third substrate slide and that is disposed along the second direction; and a second electrode for a second capacitor circuit that is disposed on the sliding surface on the second substrate and that is disposed along the second direction, and the capacitance of the variable capacitor for the second capacitor circuit changes in accordance with an area change due to the sliding of opposing regions of the first electrode for the second capacitor circuit and the second electrode for the second capacitor circuit.

[0009] FIG. 1A is a circuit layout diagram (top view) of a first substrate of an RFID tag according to a first embodiment of the present invention. FIG. 1B is a circuit layout diagram (bottom view) of a first substrate of an RFID tag according to a first embodiment of the present invention. FIG. 2A is a circuit layout diagram (top view) of a second substrate of an RFID tag according to a first embodiment of the present invention. FIG. 2B is a circuit layout diagram (bottom view) of a second substrate of an RFID tag according to a first embodiment of the present invention. FIG. 3 is a usage diagram (bottom view) showing an RFID tag according to a first embodiment of the present invention in which a first substrate and a second substrate are fitted together, in use. FIG. 4A is a usage diagram (cross-sectional view) showing an RFID tag according to a first embodiment of the present invention in which a first substrate and a second substrate are fitted together, in use. FIG. 4B is a usage diagram (cross-sectional view) showing an RFID tag according to a first embodiment of the present invention in which a first substrate and a second substrate are fitted together, in use. FIG. 5 is a diagram for explaining the principle of a variable capacitor in an RFID tag according to a first embodiment of the present invention and its relationship with displacement measurement points. FIG. 6 is a graph showing the relationship between the capacitance of the variable capacitor of the RFID tag according to the first embodiment of the present invention and the displacement of the displacement meter side point. FIG. 7 is a system configuration diagram showing the configuration of the displacement measurement system according to the first embodiment of the present invention. FIG. 8 is a functional block diagram showing the configuration of the communication circuit unit according to the first embodiment of the present invention. FIG. 9 is a circuit layout diagram (top view) of the first substrate of the RFID tag according to the second embodiment of the present invention. FIG. 10 is a circuit layout diagram (bottom view) of the first substrate of the RFID tag according to the second embodiment of the present invention. FIG. 11A is a circuit layout diagram (top view) of the second substrate of the RFID tag according to the second embodiment of the present invention. FIG. 11B is a circuit layout diagram (bottom view) of the second substrate of the RFID tag according to the second embodiment of the present invention. FIG. 12 is a diagram for explaining the principle of the variable capacitor of the RFID tag according to the second embodiment. FIG. 13 is a circuit layout diagram (top view) of the first substrate of the RFID tag according to the third embodiment of the present invention. FIG. 14 is a circuit layout diagram (bottom view) of the first substrate of the RFID tag according to the third embodiment of the present invention. FIG. 15A is a circuit layout diagram (top view) on a second substrate of an RFID tag according to a third embodiment of the present invention.FIG. 15B is a circuit layout diagram (bottom view) on the second substrate of an RFID tag according to the third embodiment of the present invention. FIG. 16 is a usage diagram (bottom view) showing an RFID tag in use in which the first substrate and the second substrate are fitted together according to the third embodiment of the present invention. FIG. 17A is a diagram for explaining a modification of the above embodiment of the present invention, showing a usage diagram (cross-sectional view) of an RFID tag in use when the first substrate and the second substrate are disposed on different objects. FIG. 17B is a diagram for explaining a modification of the above embodiment of the present invention, showing a usage diagram (cross-sectional view) of an RFID tag in use when the first substrate and the second substrate are disposed on different objects. FIG. 18 is a diagram for explaining a modification 2 of the above embodiment of the present invention, showing a detection method when multiple RFID tags are used. FIG. 19 is a diagram for explaining a modification 3 of the above embodiment of the present invention, showing a circuit layout diagram (bottom view) on the first substrate of an RFID tag. FIG. 20 is a diagram (bottom view) showing the RFID tag in use in which the first substrate and the second substrate are fitted together in the third modified example of the present invention.

[0010] (1) An embodiment of the present invention includes: a first substrate fixedly installed at a first reference position of a first object; a substrate fixedly installed at a second reference position different from the first reference position, or a substrate fixedly installed at a second reference position indicating a given position of a second object different from the first object, the second substrate being installed separately and independently from the first substrate and facing the first substrate; a sliding means that slides at least one of the first substrate and the second substrate in accordance with a displacement of the first reference position and the second reference position while maintaining the opposing state between the first substrate and the second substrate; a variable capacitor formed from a first electrode disposed on a sliding surface on the first substrate along which the first substrate and the second substrate slide, and a second electrode disposed on a sliding surface on the second substrate, the variable capacitor having a capacitance that changes in accordance with a change in area due to the sliding of opposing regions of the first electrode and the second electrode; and a transmitting means formed on either the first substrate or the second substrate, for transmitting, as change information, information indicating a change in capacitance of the variable capacitor due to sliding between the first substrate and the second substrate, wherein the first electrode and the second electrode are formed along a sliding direction indicating a sliding direction.

[0011] With this configuration, an embodiment of the present invention can output to the outside information on the change in the capacitance of the capacitor when the distance between two points on the same object or the distance between two points on two objects changes, making it possible to easily detect structural problems that are difficult to detect by visual inspection or simple measurement, such as cracks or fissures in a structure or the inclination of the structure, and is also capable of repeated use and appropriately detecting the amount of displacement.

[0012] (2) In addition, an embodiment of the present invention has a configuration in which the transmitting means has a transmitting circuit electrically connected to the variable capacitor, and the sliding means is composed of a contact structure that maintains the electrical connection between the variable capacitor and the transmitting circuit during the sliding, and a guide rail that regulates the sliding of the first substrate and the second substrate in the sliding direction.

[0013] With this configuration, the embodiment of the present invention can maintain a conductive state without breaking the electrical connection between the variable capacitor and the transmitting circuit even when the first substrate and the second substrate are slid.

[0014] (3) In addition, an embodiment of the present invention further includes a second capacitor electrically connected in series to the first capacitor representing the variable capacitor, the second capacitor being formed from a first electrode disposed on the sliding surface of the second substrate and a second electrode disposed on the sliding surface of the first substrate, and functioning as a variable capacitor whose capacitance changes in accordance with an area change due to the sliding of opposing regions of the first electrode and the second electrode. With this configuration, the embodiment of the present invention can electrically connect the variable capacitor and the transmission circuit without physically connecting them when the first substrate and the second substrate slide, and can be configured without strict design of the connection point between the variable capacitor and the transmission circuit within the sliding range.

[0015] (4) In addition, the embodiment of the present invention has a configuration in which the second electrode of the first capacitor and the first electrode of the second capacitor are integrally formed.

[0016] With this configuration, the embodiment of the present invention can reduce the number of parts, making it easier and cheaper to manufacture, and it can also provide leeway in the sliding direction, making it possible to properly detect structural defects that are difficult to predict, such as cracks or fissures in the structure or tilt of the structure.

[0017] (5) Furthermore, an embodiment of the present invention has a configuration in which a displacement measurement point for measuring the displacement of the first object is formed between the first reference position and the second reference position along the sliding direction, or a boundary between the first object and the second object is formed along the sliding direction.

[0018] (6) Furthermore, an embodiment of the present invention has a configuration in which markings that are visible from the outside and that allow the amount of movement when sliding in the sliding direction to be visible are formed on the first substrate and / or the second substrate or the portion where the second substrate is installed.

[0019] With this configuration, the embodiment of the present invention makes it possible to visually confirm the distance between two points on the same object, or the change in the distance between two points on two objects.

[0020] In addition, "formed on the second substrate or the part where the second substrate is installed" means that the marking may be formed on the second substrate itself, or may be formed on a part such as a housing on which the second substrate is formed.

[0021] Furthermore, the "marking" may be anything that allows the distance between two points on the same object or the distance between two points on two objects to be visually recognized.

[0022] For example, the marking formed on either the first substrate or the second substrate (including the formed portion) may be a marking that allows the distance from a predetermined sliding start position to be visually recognized, or the marking formed on both the first substrate and the second substrate (including the formed portion) may be a marking that aligns both substrates at the start of sliding.

[0023] (7) In order to solve the above problem, an embodiment of the present invention includes: a first substrate fixedly installed on a first object; a second substrate which is a substrate fixedly installed on the first object at a second reference position different from the first reference position, separate and independent from the first substrate, or a substrate fixedly installed at a second reference position indicating a given position of a second object different from the first object; a third substrate which is a substrate fixedly installed on the first object or the second object at a third reference position different from the first and second reference positions, separate and independent from at least the second substrate, or a substrate fixedly installed at a third reference position indicating a given position of a third object different from the first and second objects, and which is fixedly installed facing the first substrate and the second substrate; and a sliding means which slides the first substrate, the second substrate, and the third substrate in a first direction and a second direction different from the first direction while maintaining the opposing states of the first substrate, the second substrate, and the third substrate, respectively. a first capacitor circuit whose capacitance changes with sliding in the first direction; a second capacitor circuit whose capacitance changes with sliding in the second direction; and a transmitting means for transmitting information indicating each of the changes in capacitance of the first capacitor circuit and the changes in capacitance of the second capacitor circuit as change information, wherein the first capacitor circuit is composed of a first electrode for the first capacitor circuit that is disposed on the sliding surface on the first substrate along which the first substrate and the second substrate slide and that is disposed along the first direction, and a second electrode for the first capacitor circuit that is disposed on the sliding surface on the second substrate and that is disposed along the first direction, and has a first capacitor circuit variable capacitor whose capacitance changes with an area change due to sliding in the first direction of opposing regions of the first electrode for the first capacitor circuit and the second electrode for the first capacitor circuit, and wherein the second capacitor circuit isThe variable capacitor has a configuration including: a first electrode for a second capacitor circuit that is disposed on the third substrate at a sliding surface where the second substrate and the third substrate slide and that is disposed along the second direction; and a second electrode for a second capacitor circuit that is disposed on the sliding surface on the second substrate and that is disposed along the second direction, and the capacitance of the variable capacitor for the second capacitor circuit changes in accordance with an area change due to the sliding of opposing regions of the first electrode for the second capacitor circuit and the second electrode for the second capacitor circuit.

[0024] With this configuration, an embodiment of the present invention can output two-dimensional position changes of the same object or two-dimensional position changes of two objects to the outside as information on changes in the capacitance of a capacitor, making it possible to easily detect structural problems that are difficult to detect by visual inspection or simple measurement, such as cracks or fissures in a structure or the inclination of the structure, and is also capable of being used repeatedly and appropriately detecting the amount of displacement.

[0025] (8) Also, an embodiment of the present invention is such that the first capacitor circuit further comprises a second variable capacitor electrically connected in series to the first variable capacitor representing the variable capacitor for the first capacitor circuit, the second variable capacitor being formed from a first electrode for the second variable capacitor disposed on the sliding surface of the second base material and a second electrode for the second variable capacitor disposed on the sliding surface of the first base material, and functions as a variable capacitor whose capacitance changes in accordance with an area change due to the sliding of opposing regions of the first electrode for the second variable capacitor and the second electrode for the second variable capacitor, the second capacitor circuit further comprises a fourth variable capacitor electrically connected in series to the third variable capacitor representing the variable capacitor for the second capacitor circuit, the fourth variable capacitor being formed from a first electrode for the fourth variable capacitor disposed on the sliding surface of the second base material and a second electrode for the fourth variable capacitor disposed on the sliding surface of the third base material, The fourth variable capacitor has a configuration that functions as a variable capacitor whose capacitance changes in accordance with the change in area due to the sliding of the opposing regions of the fourth variable capacitor first electrode and the fourth variable capacitor second electrode.

[0026] With this configuration, an embodiment of the present invention can electrically connect the variable capacitor and the transmission circuit without physically connecting them when the first substrate and the second substrate, or the first substrate and the third substrate, slides, so that the connection points between the variable capacitor and the transmission circuit within the sliding range do not need to be strictly designed.

[0027] (9) Furthermore, an embodiment of the present invention has a configuration in which the second electrode for the first variable capacitor, the first electrode for the second variable capacitor, the second electrode for the third variable capacitor, and the first electrode for the fourth variable capacitor are integrally formed.

[0028] With this configuration, the present invention can reduce the number of parts, making it easier and cheaper to manufacture.

[0029] (10) Also, an embodiment of the present invention has a configuration in which the transmitting means has a transmitting circuit electrically connected to the first capacitor circuit and the second capacitor circuit, and the sliding means is composed of a first contact structure that maintains the electrical connection between the variable capacitor for the first capacitor circuit and the transmitting circuit when sliding in a first direction, a second contact structure that maintains the electrical connection between the variable capacitor for the second capacitor circuit and the transmitting circuit when sliding in a second direction, and guide rails that regulate the sliding of the first substrate and the third substrate in each of the first direction and the second direction.

[0030] (11) Furthermore, an embodiment of the present invention has a configuration including a displacement detection processing device that receives change information transmitted from the information communication terminal device and detects a displacement between at least two substrates based on the received change information.

[0031] With this configuration, an embodiment of the present invention can detect displacement between two or three substrates based on a linear or two-dimensional position change of the same object, or a linear or two-dimensional position change of two objects. This makes it possible to easily detect structural problems that are difficult to detect by visual inspection or simple measurement, such as cracks or fissures in a structure, or the inclination of the structure, and is also reusable and can appropriately detect the amount of displacement.

[0032] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0033] The embodiment described below is an embodiment in which the information communication terminal device and displacement management system of the present application are applied to an information communication system having an IC (Integrated Circuit) tag (hereinafter also referred to as an "RFID tag") for RFID (Radio Frequency Identification), which communicates with a reader / writer using wireless communication and reads and writes predetermined information by the reader / writer, and an information processing device that receives information (signals) transmitted from the RFID tag and executes predetermined information processing. However, the present application is not limited to the following embodiments within the scope including its technical concept.

[0034] In the following embodiments, an RFID tag that is fixed to a given object such as a wall of a building will be used for explanation.

[0035] [A] First Embodiment [A1] RFID Tag [A1.1] Overview and General Configuration of RFID Tag First, the overview and general configuration of an RFID tag 100 of this embodiment will be described with reference to FIGS. 1A to 4B.

[0036] 1A and 1B are circuit layout diagrams (top and bottom surfaces) of the first substrate 110 of the RFID tag 100 of this embodiment, and FIGS. 2A and 2B are circuit layout diagrams (top and bottom surfaces) of the second substrate 120 of the RFID tag 100 of this embodiment.

[0037] 3, 4A, and 4B are diagrams (bottom views or cross-sectional views) showing the RFID tag 100 in use in this embodiment, in which the first substrate 110 and the second substrate 120 are fitted together.

[0038] The RFID tag 100 of this embodiment has a configuration that makes it possible to easily detect cracks or fissures in the same object (i.e., structure) such as a building (including a bridge or tunnel) constructed of concrete, or structural problems such as the inclination of the structure that are difficult to detect by visual inspection or simple measurement.

[0039] In particular, the RFID tag 100 of this embodiment has each circuit element disposed within a transparent housing B, and also has a structure for forming a variable capacitor 200 .

[0040] Specifically, as shown in Figures 1A to 4B, the RFID tag 100 of this embodiment comprises: a first substrate 110 fixedly installed at a first reference position P1 of a structure OB; a second substrate 120 which is a substrate fixedly installed at a second reference position P2 different from the first reference position P1 and which is fixedly installed on the structure OB separately and independently from the first substrate 110 and facing the first substrate 110; and a guide rail (male portion) 131 and a guide race (female portion) 141 as sliding means for sliding the first substrate 110, the second substrate 120, or both, in accordance with displacements of the first reference position P1 and the second reference position P2 while maintaining the opposing state between the first substrate 110 and the second substrate 120.

[0041] 1A to 4B, the RFID tag 100 of this embodiment is a capacitor formed from a first electrode 210 disposed on a sliding surface on the first substrate 110 where the first substrate 110 and the second substrate 120 slide against each other, and a second electrode 220 disposed on the sliding surface on the second substrate 120, and is provided with a variable capacitor 200 whose capacitance changes in accordance with the change in area due to the sliding of the opposing regions of the first electrode 210 and the second electrode 220.

[0042] Furthermore, the RFID tag 100 of this embodiment is equipped with a communication circuit section 300 that transmits, as change information, information indicating the change in capacitance of the variable capacitor 200 that accompanies sliding between the first substrate 110 and the second substrate 120, as shown in Figures 1A to 4B.

[0043] The first electrode 210 and the second electrode 220 constituting the variable capacitor 200 of this embodiment have a configuration formed along the sliding direction indicating the sliding direction, as shown in Figures 1A to 4B.

[0044] In addition to the above, the RFID tag 100 of this embodiment has a contact structure that maintains the electrical connection between the variable capacitor 200 and the communication circuit section 300 during sliding, as shown in FIGS. 1A to 4B.

[0045] With this configuration, the RFID tag 100 of this embodiment can output to the outside information on the change in the capacitance of the capacitor when the distance between two points on the structure OB changes, making it possible to easily detect structural problems that are difficult to detect by visual inspection or simple measurement, such as cracks or fissures in the structure OB or the inclination of the structure OB, and is also capable of being used repeatedly and of properly detecting the amount of displacement.

[0046] [A1.2] Configuration of RFID Tag Next, the configuration of the RFID tag 100 of this embodiment will be described in detail.

[0047] The first substrate 110 is not particularly limited as long as it is an insulating substrate, and for example, a glass substrate, a resin substrate, a plastic film, or paper can be used.

[0048] Furthermore, as shown in Figures 3, 4A and 4B, the first substrate 110 is fixed at a first reference position P1 of the structure OB by a screw, nail or other fixing member 30 at an end 112 opposite to an end 111 that is fitted into the transparent housing B on which the second substrate 120 is formed.

[0049] That is, the first substrate 110 is installed along the sliding direction as shown in Figures 3, 4A, and 4B, and the second substrate 120 is installed so that a displacement measurement point T for measuring the displacement of the structure OB is located between a second reference position P2 and a first reference position P1 as described below.

[0050] The first base material 110 may be fixed by double-sided tape or a given adhesive instead of the fixing member 30 .

[0051] The first substrate 110 is, for example, 35 mm in length and 56 mm in width (length in the sliding direction), and both the top and bottom surfaces are covered with a protective film (resist) whose main component is resin, avoiding at least the area where part of the communication circuit section 300 is formed (for example, the area where the IC 310 is formed), the connection terminal 113, and the stationary electrode 124.

[0052] As shown in Figures 1A to 4B, on the upper surface side of the first substrate 110, a communication circuit section 300 is provided, along with a protective film, which is formed from an IC 310, an antenna 320, and an element for the antenna 320 (hereinafter referred to as the "antenna element") 330.

[0053] The communication circuit unit 300 may be provided under or on the protective film, but is preferably covered with the protective film from the viewpoint of rust prevention.

[0054] 1A to 2B, a marking 400 is formed (e.g., printed) on the protective film on the upper surface of the first substrate 110, which is visible from the outside and allows the amount of movement when sliding in the sliding direction to be visible, and which is used for alignment with the marking M formed on the transparent housing B.

[0055] In this embodiment, the markings are formed on both the first substrate 110 side and the second substrate 120 side, but the markings may also be formed on either the first substrate 110 or the second substrate 120 (including the portions where they are formed).

[0056] That is, the marking of this embodiment may be any marking that allows the distance between two points on the same object to be visually recognized.

[0057] On the other hand, as shown in Figures 1A to 4B, on the bottom side (second surface, sliding surface) of the first substrate 110, there are provided a first electrode 210 which functions as an electrode of the variable capacitor 200 and is connected via an electrode wire to the communication circuit section 300 formed on the top surface side, and a connection terminal 113 which is a terminal for electrically connecting to a second electrode 220 which functions as another electrode of the variable capacitor 200 and is connected via an electrode wire to the communication circuit section 300 formed on the top surface side.

[0058] The first electrode 210 has a predetermined length (about 30 mm) extending in the sliding direction and a predetermined width (for example, about 5 mm to 10 mm).

[0059] The connection terminal 113 is physically connected to the stationary electrode 124 formed on the second substrate 120 during sliding, and slides on the stationary electrode 124 as the first substrate 110 and the second substrate 120 slide.

[0060] Furthermore, as shown in Figures 1A to 4B, a guide rail (male part) 131 is formed on the bottom side of the first substrate 110, which slides at least one of the first substrate 110 and the second substrate 120 in accordance with the displacement of the first reference position P1 and the second reference position P2 while maintaining the opposing state between the first substrate 110 and the second substrate 120.

[0061] In particular, the guide rails (male portions) 131 are rectangular members that are fitted into the insertion openings of the second base material 120, and are a pair of wide left and right rails that have a given length in the sliding direction.

[0062] A pair of left and right guide rails 131 are formed at the ends perpendicular to the sliding direction, and extend from near the center of the first substrate 110 to a guide stopper 133 that limits the sliding range during sliding.

[0063] The guide stopper 133 is formed on the end portion 112 side together with the through-hole 31 through which the fixing member 30 passes. The guide stopper 133 is formed to have a width of, for example, 10 mm.

[0064] Like the first substrate 110, the second substrate 120 is not particularly limited as long as it is an insulating substrate, and for example, a glass substrate, a resin substrate, a plastic film, or paper can be used.

[0065] The second substrate 120 is housed in a transparent housing B, as shown in Figures 4A and 4B, and is fixed together with the housing B at a second reference position P2 of the structure OB by a screw, nail or other fixing member 30 at an end 122 opposite to an end 121 that receives and fits the first substrate 110.

[0066] That is, as shown in Figures 4A and 4B, the second substrate 120 is installed along the sliding direction so that a displacement measurement point T for measuring the displacement of the structure OB is located between the first reference position P1 where the first substrate 110 is located as described above and the second reference position P2.

[0067] The second base material 120 has a size of, for example, 40 mm in length and 40 mm in width (length in the sliding direction).

[0068] As with the first base material 110, the second base material 120 may be fixed by double-sided tape or a given adhesive instead of the fixing member 30.

[0069] As shown in Figures 1A to 4B, on the upper surface side of the second substrate 120, there are arranged a second electrode 220 which functions as an electrode of the variable capacitor 200 and is arranged opposite the first electrode 210, and a stationary electrode 124 which is connected to the second electrode 220 via an electrode wire and is physically and electrically connected to a connection terminal 113 provided on the first substrate 110.

[0070] As shown in Figure 3, when measurement of the displacement measurement point is started and the first substrate 110 is completely fitted to the second substrate, the second electrode 220 has an area that completely covers the width direction and sliding direction of the first electrode 210.

[0071] The second electrode 220 has, for example, a predetermined length (30 mm or more) extending in the sliding direction and a predetermined width (for example, 7 mm to 14 mm or more).

[0072] The stationary electrode 124 extends in the sliding direction, and is formed so that the connection terminal 113 slides in conjunction with the sliding of the first substrate 110 and the second substrate 120 .

[0073] On the other hand, on the bottom side (the second surface, the sliding surface) of the second substrate, as shown in Figures 1A to 4B, a guide rail (female part) 141 is formed which pairs with the guide rail (male part) 131 of the first substrate, fits the guide rail (male part) 131 inside, and functions as a sliding means.

[0074] The guide rails (female portion) 141 have an insertion opening into which the guide rails (male portion) 131 of the first base material 110 are inserted, and are a pair of wide rails on the left and right sides having a given length in the sliding direction.

[0075] In particular, the pair of left and right guide rails (female portions) 141 are formed at the ends in the direction perpendicular to the sliding direction, similar to the guide rails (male portions) 131 .

[0076] The pair of left and right guide rails 141 (female portions) are shaped to abut against the guide stoppers 133 of the first base material 110 and not allow sliding thereafter.

[0077] [A1.3] Principle of Variable Capacitor and Relationship with Displacement Measurement Points Next, the principle of the variable capacitor of the RFID tag 100 of this embodiment and its relationship with displacement measurement points will be described with reference to FIGS. 5 and 6. FIG.

[0078] FIG. 5 is a diagram for explaining the principle of the variable capacitor of the RFID tag 100 of this embodiment and its relationship with the displacement measurement point, and FIG. 6 is a graph showing the relationship between the capacitance of the variable capacitor of the RFID tag of this embodiment and the displacement amount at the displacement meter side point.

[0079] As shown in Figures 5 and 6, the variable capacitor 200 of this embodiment has a first electrode 210 and a second electrode 220 that face each other with a predetermined gap (e.g., about 1 mm) between them, and therefore functions as a capacitor that exhibits a capacitance that corresponds to the area where the first electrode 210 and the second electrode 220 face each other.

[0080] In particular, the variable capacitor 200 of this embodiment has the maximum capacitance when measurement of the displacement measurement point is started and the first substrate 110 is completely fitted into the second substrate (see, for example, Figure 5 (A)).

[0081] Furthermore, if the crack at the displacement measurement point becomes larger and spreads in the direction in which the first substrate 110 and the second substrate 120 are separated, the area in which the first electrode 210 and the second electrode 220 face each other gradually becomes smaller as a result of the spread, and the capacitance of the variable capacitor 200 of this embodiment also becomes smaller (see, for example, the lower diagram in Figure 5).

[0082] For example, the capacitance value of the variable capacitor 200 can be calculated using the following (Equation 1) relating to the capacitance of a plate capacitor.

[0083] Capacitance=εS / d (Equation 1)

[0084] In the formula (1), "ε" is a dielectric constant. In this embodiment, air is present between the first electrode 210 and the second electrode 220, so the dielectric constant "ε" is the dielectric constant of a vacuum, "ε" ０ = 8.85 x 10 －１２ (F / m)”.

[0085] In addition, in (Equation 1), "d" represents the distance between the electrodes, and in this embodiment, is set to about "1 mm."

[0086] Furthermore, in (Equation 1), "S" corresponds to the area of ​​the overlapping region of the first electrode 210 and the second electrode 220 that constitute the plate capacitor.

[0087] In this embodiment, the dielectric constant "ε" and the inter-electrode distance "d" are fixed at constant values ​​and do not change, so the capacitance value of the variable capacitor 200 is proportional to the area of ​​the overlapping region of the first electrode 210 and the second electrode 220. As shown in Figure 6, the area of ​​this region changes as the crack at the displacement measurement point spreads, and as a result, it can be seen that the capacitance value of the variable capacitor 200 changes linearly.

[0088] 6 shows that the capacitance of variable capacitor 200 decreases by 0.38 pF for every 0.1 mm of expansion. The size of first electrode 210 in the experimental results of FIG. 6 is 40 mm in length (width) and 20 mm in width (length in the sliding direction), and the size of second electrode 210 is 40 mm in length (width) and 20 mm in width (length in the sliding direction). However, FIG. 6 also shows that due to structural reasons such as connections or electrostatic capacitance (parasitic capacitance) parasitizing the circuit, RFID tag 100 does not achieve the ideal capacitor capacitance shown in Equation 1 above, and a considerable loss occurs.

[0089] [A1.4] Communication Circuit Section Next, the communication circuit section 300 of this embodiment will be described with reference to FIGS.

[0090] 7 is a system configuration diagram showing the configuration of the displacement measuring point management system S of this embodiment, and FIG. 8 is a functional block diagram showing the configuration of the communication circuit section 300 of this embodiment.

[0091] The communication circuit unit 300 is configured to receive signals transmitted from a reader device such as the displacement measurement point management system S described below, generate an electromotive force based on the received signal, and use the electromotive force to send and receive signals to the outside.

[0092] Furthermore, as described above, the communication circuit section 300 is provided on a surface (upper surface) of the first substrate 110 different from the surface on which the first electrode 210 is formed, and is electrically connected to the first electrode 210, and is also electrically connected to the second electrode 220 via the stationary electrode 124 of the second substrate 120 and the connection terminal 113 of the first substrate 110.

[0093] Specifically, as shown in FIGS. 1A and 1B, the communication circuit section 300 is composed of an IC 310, an antenna 320, and a pair of antenna elements 330.

[0094] The IC 310 has circuits (internal circuits) for executing various processes including transmitting and receiving signals in a given band (for example, UHF band), and is configured to execute appropriate processes depending on the usage mode.

[0095] The IC 310 is formed in the center of the first substrate 110 and is electrically connected to the first electrode 210 , the second electrode 220 , and the antenna 320 .

[0096] In particular, IC 310 has a memory and elements as a transmitting / receiving circuit that mediates the transmission and reception of signals between antenna 320 and each internal circuit, as well as an electromotive force generation control circuit that generates electromotive force based on the signal received by antenna 320 and supplies it to each internal circuit, and a processing circuit that executes predetermined processing.

[0097] For example, the IC 310, as a transmission / reception circuit, is configured to transmit and receive signals in a frequency band used in a corresponding system, and includes a downconverter that downconverts an RF (Radio Frequency) signal to a baseband signal, an upconverter that upconverts the baseband signal to an RF signal, a filter circuit, a modulator / demodulator, a DAC (Digital-to-Analog Converter), and an ADC (Analog-to-Digital Converter).

[0098] The electromotive force generation control circuit generates an electromotive force based on electromagnetic waves supplied from the information processing device 500 (specifically, the RFID reader / writer 540), and supplies the generated electromotive force to each circuit as power.

[0099] Then, the processing circuit executes a predetermined process of transmitting a signal related to the capacitor formed by the first electrode 210 and the second electrode 220 to the displacement measurement point management system S in accordance with a predetermined protocol.

[0100] In addition to the signal related to the capacitor formed by the first electrode 210 and the second electrode 220, the IC 310 may also perform a process of transmitting an identification signal (identification information) of the corresponding RFID tag 100 when used simultaneously with one or more other RFID tags 100.

[0101] In this case, the memory is a non-volatile memory having a predetermined storage area, and for example, the identification information of the RFID tag 100 is stored in the storage area.

[0102] The antenna 320 is formed in a given shape (for example, a circle or a square) based on the IC 310 formed in the center of the substrate 20 , and is connected to the IC 310 and a pair of antenna elements 330 .

[0103] The pair of antenna elements 330 are formed from a conductor such as aluminum or copper, and have a predetermined shape that extends outward from the antenna 320 .

[0104] Furthermore, like the other elements of the communication circuit section 300, the pair of antenna elements 330 are provided on a surface (upper surface) of the first substrate 110 different from the surface on which the first electrode 210 is formed.

[0105] If the RFID tag 100 is an active type, the communication circuit section 300 has a power source.

[0106] [A2] Displacement Measuring Point Management System [A2.1] Overview of Displacement Measuring Point Management System Next, a displacement measuring point management system S using the RFID tag 100 of this embodiment will be described.

[0107] The displacement measuring point management system S of this embodiment is a system that uses a signal transmitted from the RFID tag 100 to measure the displacement of a targeted displacement measuring point on which the RFID tag 100 is placed.

[0108] In particular, the displacement measurement point management system S of this embodiment has one or more of the above-mentioned RFID tags 100 and an information processing device 500 that performs various processes related to measuring the displacement measurement point targeted by each RFID tag 100 based on the signal transmitted from that RFID tag 100.

[0109] That is, the displacement measurement point management system S of this embodiment is composed of an RFID tag 100 that transmits the capacitance of the variable capacitor 200 as information at predetermined timings, and an information processing device 500 that receives the signal transmitted from the RFID tag 100 and performs processing such as tallying and calculating the displacement measurement points and notifying the administrator based on the received signal.

[0110] The information processing device 500 is an information processing device configured by an information processing device such as a PC (personal computer), a tablet type information communication terminal device, or a smartphone used by an administrator.

[0111] The information processing device 500 then transmits electromagnetic waves to supply power to the RFID tag 100, and performs processes such as tallying and calculating displacement measurement points and notifying the administrator based on the information (signal) transmitted from the RFID tag 100.

[0112] [A2.2] Configuration of Information Processing Apparatus Next, the information processing apparatus 500 of this embodiment will be described with reference to Fig. 8. Fig. 8 is a functional block diagram showing the configuration of the information processing apparatus 500 of this embodiment.

[0113] As shown in FIG. 8, the information processing device 500 of this embodiment has a processing unit 510, an RFID reader / writer 540, an operation input unit 560 consisting of a touch panel or the like, a memory unit 570, an information storage medium 580, a display unit 590 consisting of a display element such as a liquid crystal panel, a sound output unit 592, and a communication unit 596.

[0114] The RFID reader / writer 540 transmits electromagnetic waves to supply power to the RFID tag 100 and given data (for example, the ID of the RFID tag 100 ), while receiving a signal transmitted from the RFID tag 100 .

[0115] For example, the RFID reader / writer 540 of this embodiment provides the RFID tag 100 with electromagnetic waves for power supply and identification information (ID) of the RFID tag 100 from which data is to be acquired, and also reads (acquires) information on the capacitance of each variable capacitor 200 at a predetermined timing.

[0116] In addition, the RFID reader / writer 540 of this embodiment may acquire the identification information (ID) of the RFID tag 100 along with the capacitance information of each variable capacitor 200 at a predetermined timing (especially when multiple RFID tags 100 are used), or may simply acquire the identification information (ID) of the RFID tag 100 instead of the information transmitted from the RFID tag 100.

[0117] The operation input unit 560 is a device for inputting input information such as operation instructions from the user, and outputs the user's input information to the processing unit 510 .

[0118] The operation input unit 560 of this embodiment has a configuration for detecting input information (input signals) from the user, and is composed of, for example, a lever, buttons, a microphone, a touch panel display, a keyboard, a mouse, and the like.

[0119] The storage unit 570 serves as a work area for the processing unit 510 and the like, and its functions can be realized by hardware such as a RAM (VRAM).

[0120] The storage unit 570 of this embodiment includes a main storage unit 171 that is used as a work area.

[0121] The information storage medium 580 is computer-readable, and stores various types of data including various applications and an OS (operating system).

[0122] That is, the information storage medium 580 stores applications for causing a computer to function as each unit of this embodiment (applications for causing a computer to execute the processing of each unit).

[0123] For example, the information storage medium 580 is an optical disk (CD, DVD), a magneto-optical disk (MO), a magnetic disk, a hard disk drive, a flash memory, a magnetic tape, a memory (ROM), a memory card, or the like.

[0124] The communication unit 596 performs various controls for communication with the outside (for example, the RFID tag 100), and its functions are configured by hardware such as various processors or communication ASICs, or programs.

[0125] The processing unit 510 can perform various processes of this embodiment by reading and executing the applications stored in the information storage medium 580. Note that the types of applications stored in the information storage medium 580 are arbitrary.

[0126] The processing unit 510 performs various processes of this embodiment based on the application stored in the information storage medium 580. Note that the processing unit 510 of this embodiment may read out programs and data stored in the information storage medium 580, temporarily store the read out programs and data in the storage unit 570, and perform processing based on the programs and data.

[0127] The processing unit 510 (processor) performs various processes using the main memory unit 171 in the memory unit 570 as a work area. The functions of the processing unit 510 can be realized by hardware such as various processors (CPU, DSP, etc.) or programs.

[0128] The processing unit 510 includes a communication control unit 511, an input reception processing unit 512, a displacement management unit 513, a display control unit 514, a reading control unit 515, a drawing unit 520, and a sound processing unit 530. Note that some of these units may be omitted.

[0129] The communication control unit 511 controls the RFID reader / writer 540 to transmit and receive data to and from the RFID tag 100 .

[0130] In particular, the communication control unit 511 transmits electromagnetic waves for electromotive force and data such as identification information (ID) of the RFID tag 100 from which data is to be acquired to the RFID tag 100, while receiving data (signals) transmitted from the RFID tag 100.

[0131] The communication control unit 511 then performs processing such as storing the received data in the storage unit 570, analyzing the received data, and controlling other processing related to the transmission and reception of data.

[0132] When the input reception processing unit 512 receives a signal transmitted from the RFID tag 100 , it outputs the received signal to the displacement management unit 513 .

[0133] The displacement management unit 513 executes processing related to the displacement of the displacement measurement point based on the information transmitted from the RFID tag 100 via the input reception processing unit 512 .

[0134] For example, when the displacement management unit 513 receives information on the capacitance of the variable capacitor 200 transmitted from the RFID tag 100, it works in conjunction with the sound processing unit 530 to perform processing to output a given alarm sound from the sound output unit 592, or works in conjunction with the display control unit 514 to perform processing to display a warning image on the display unit 590.

[0135] In addition, the displacement management unit 513 may receive information from multiple RFID tags 100. In this case, it manages the reception of signals transmitted from each RFID tag 100 and executes a given process in response to changes in each displacement measurement point where an RFID tag 100 is installed in advance.

[0136] For example, in this case, the displacement management unit 513 performs a given calculation based on the capacitance transmitted from the RFID tag 100, and calculates the amount of displacement (i.e., the amount of movement).

[0137] Then, the displacement management unit 513 generates data (hereinafter referred to as "visualization data") for visualizing the calculated amount of displacement, and in conjunction with the display control unit 514, displays the visualization data superimposed on an image that maps the locations of each RFID tag 100.

[0138] The display control unit 514 executes a process of displaying an image relating to the displacement of the displacement measurement point on the display unit 590 .

[0139] The read control unit 515 controls the RFID reader / writer 540 that reads given information (signals) transmitted from the RFID tag 100 .

[0140] The drawing unit 520 performs drawing processing based on the various processes performed by the processing unit 510 , thereby generating an image, which is output to the display unit 590 by the display control unit 514 .

[0141] The sound processing unit 530 performs sound processing based on the results of various processes performed in the processing unit 510 , generates sound effects, alarm sounds, etc., and outputs them to the sound output unit 592 .

[0142] [B] Second Embodiment [B1] Overview and General Configuration of RFID Tag First, the overview and general configuration of an RFID tag 100 of this embodiment will be described with reference to FIGS.

[0143] 9 is a circuit layout diagram (top view) of the first substrate 110 of the RFID tag 100 of this embodiment, and FIG. 10 is a circuit layout diagram (bottom view) of the first substrate 110 of the RFID tag 100 of this embodiment.

[0144] 11A and 11B are circuit layout diagrams (top and bottom views) of the second substrate 120 of the RFID tag 100 in this embodiment, and FIG. 12 is a diagram for explaining the principle of the variable capacitor of the RFID tag 100 in this embodiment.

[0145] This embodiment is characterized in that, instead of realizing the electrical connection between the variable capacitor (hereinafter referred to as the "first variable capacitor") 200 and the communication circuit section 300 by sliding the connection terminal 113 on the stationary electrode 124 in the first embodiment, the electrical connection is realized by forming a second variable capacitor 250 that is different from the first variable capacitor 200, thereby eliminating the physical connection structure.

[0146] That is, as shown in FIGS. 9 to 12 , the RFID tag 100 of this embodiment further includes a second variable capacitor 250 electrically connected in series to the variable capacitor (i.e., first variable capacitor) 200 of the first embodiment, and the second variable capacitor 250 is formed from a first electrode 220 disposed on the sliding surface of the second substrate 120 and a second electrode 230 disposed on the sliding surface of the first substrate 110, and has a configuration in which the second variable capacitor 250 functions as a variable capacitor whose capacitance changes in accordance with the change in area due to the sliding of the opposing regions of the first electrode 220 and the second electrode 230.

[0147] In particular, in the RFID tag 100 of this embodiment, the second electrode 220 of the first variable capacitor 200 and the first electrode 220 of the second variable capacitor 250 are configured as integrally formed planar electrodes.

[0148] With this configuration, the RFID tag 100 of this embodiment, like the first embodiment, can output to the outside information on the change in capacitance of the capacitor when the distance between two points on the structure OB changes, making it possible to easily detect structural problems that are difficult to detect by visual inspection or simple measurement, such as cracks or fissures in the structure OB or the inclination of the structure OB, and is also capable of being used repeatedly and of properly detecting the amount of displacement.

[0149] Furthermore, the RFID tag 100 of this embodiment can be manufactured more easily and inexpensively because the number of parts can be reduced.

[0150] In addition, in this embodiment, the configuration other than the above-mentioned characteristic points is the same as that of the first embodiment, and the same members are given the same reference numerals and the description thereof will be omitted.

[0151] [B2] Configuration of RFID Tag Next, the configuration of the RFID tag 100 of this embodiment will be described in detail.

[0152] The first substrate 110 has a shape different from that of the first embodiment, with the first electrode 210 of the first variable capacitor 200 and the second electrode 230 of the second variable capacitor formed on the end 111 side, and the communication circuit section 300 formed on the end 112 side.

[0153] In particular, the first substrate 110 is configured to have a length of 35 mm and a width (length in the sliding direction) of 56 mm to 105 mm, and both the top and bottom surfaces are covered with a protective film (resist) whose main component is resin or the like.

[0154] As shown in Figures 9 and 10, on the upper surface of the first substrate 110, a communication circuit section 300 is provided, along with a protective film, which is formed from an IC 310, an antenna 320, and an element for the antenna 320 (hereinafter referred to as the ``antenna element'') 330.

[0155] 9 and 10 , a marking 400 is formed on the protective film on the upper surface of the first substrate 110. The marking 400 is visible from the outside, allows the amount of movement when the first substrate 110 is slid in the sliding direction to be visible, and is used for alignment with the marking M formed on the transparent housing B. The marking M is formed by printing on the housing B.

[0156] As in the first embodiment, the communication circuit unit 300 may be provided under or on the protective film, but as in the first embodiment, it is preferable that the communication circuit unit 300 be covered with a protective film from the viewpoint of rust prevention.

[0157] On the other hand, as shown in Figures 9 and 10, on the bottom side (second surface, sliding surface) of the first substrate 110, there are provided a first electrode 210 which functions as an electrode of the first variable capacitor 200 and is connected via an electrode wire to the communication circuit section 300 formed on the top side, and a second electrode 230 which functions as an electrode of the second variable capacitor 250 and which, together with the first electrode 210 which functions as an electrode of the first variable capacitor 201, is connected via an electrode wire to the communication circuit section 300 formed on the top side.

[0158] First electrode 210 of first variable capacitor 201 has a predetermined length (approximately 30 mm) extending in the sliding direction and a predetermined width (for example, approximately 5 mm to 10 mm).

[0159] The second electrode 230 of the second variable capacitor, like the first electrode 210 of the first variable capacitor 200, has a predetermined length (approximately 30 mm) extending in the sliding direction and a predetermined width (for example, approximately 5 mm to 10 mm).

[0160] Furthermore, as shown in Figures 9 and 10, a pair of guide rails (male portion) 131 and guide rails (female portion) 141 are formed on the bottom side of the first substrate 110, which slide at least one of the first substrate 110 and the second substrate 120 in accordance with the displacement of the first reference position P1 and the second reference position P2 while maintaining the opposing state between the first substrate 110 and the second substrate 120.

[0161] The guide rails (male portions) 131 are rectangular members that are fitted into the insertion openings of the second base material 120, and are a pair of wide rails on the left and right sides that have a given length in the sliding direction.

[0162] In particular, a pair of left and right guide rails (male parts) 131 are formed at the ends perpendicular to the sliding direction, and extend from the center of the first electrode 210 and the second electrode 230 to near the center of the first substrate 110.

[0163] The second substrate 120 is stored in a housing B similar to that of the first embodiment, as shown in Figures 11A and 11B, and is fixed to a second reference position P2 of the structure OB together with the housing B by a screw, nail or other fixing member 30 at an end 122 opposite to an end 121 that receives and fits the first substrate 110.

[0164] The second base material 120 has a length of 50 mm and a width (length in the sliding direction) of 60 mm.

[0165] As shown in Figures 11A and 11B, a planar electrode 220 is arranged on the upper surface of the second substrate 120, which serves as the second electrode of the first variable capacitor 201 and also as the first electrode of the second variable capacitor 250.

[0166] The planar electrode 220 has, for example, a predetermined length (45 mm or more) extending in the sliding direction and a predetermined width (for example, 38 mm or more).

[0167] On the other hand, as shown in Figures 11A and 11B, on the bottom side (the second surface, the sliding surface) of the second substrate, a guide rail (female part) 141 is formed which pairs with the guide rail (male part) 131 of the first substrate, has the guide rail (male part) 131 fitted inside, and functions as a sliding means.

[0168] The guide rails (female portion) 141 have an insertion opening into which the guide rails (male portion) 131 of the first base material 110 are inserted, and are a pair of wide rails on the left and right sides having a given length in the sliding direction.

[0169] In particular, the pair of left and right guide rails 141 are formed at the ends in the direction perpendicular to the sliding direction, similar to the guide rail (male portion) 131 .

[0170] [B3] Principle of the Variable Capacitor Next, the principle of the variable capacitor of the RFID tag 100 of this embodiment will be described.

[0171] As shown in FIG. 12 , the first variable capacitor 200 of this embodiment is opposed to the planar electrode 220 and the second electrode 230 of the second variable capacitor 250 at a predetermined distance (for example, about 1 mm) in addition to the first variable capacitor 200 itself, and therefore functions as a variable capacitor that exhibits a capacitance according to the area where the planar electrode 220 and the second electrode 230 face each other, similar to the first variable capacitor 200.

[0172] Furthermore, in this embodiment, in the RFID tag 100 of the second embodiment, the first variable capacitor 200 and the second variable capacitor 250 are connected in series, and the capacitance value is proportional to the area of ​​the region where the electrodes of the first variable capacitor 200 and the second variable capacitor 250 overlap. As in the first embodiment, the area of ​​this region changes as the crack at the displacement measurement point spreads, and as a result, it can be seen that the capacitance value due to the series combination of the first variable capacitor 200 and the second variable capacitor 250 changes linearly.

[0173] [C] Third Embodiment [C1] Overview of RFID Tag First, an overview of the RFID tag 100 of this embodiment will be described with reference to FIGS. 13 to 16. FIG.

[0174] 13 is a circuit layout diagram (top view) of the first substrate 110 of the RFID tag 100 of this embodiment, and FIG. 14 is a circuit layout diagram (bottom view) of the first substrate 110 of the RFID tag 100 of this embodiment.

[0175] 15A and 15B are circuit layout diagrams (top view and bottom view) of the second substrate 120 of the RFID tag 100 in this embodiment, and FIG. 16 is a usage state diagram (bottom view) showing the RFID tag 100 in this embodiment with the first substrate 110 and the second substrate 120 fitted together, in use.

[0176] This embodiment is characterized in that, in the RFID tag 100 of the second embodiment, in addition to the change in capacitance of the variable capacitors (i.e., the first variable capacitor and the second variable capacitor) accompanying one sliding direction at one displacement measurement point T, variable capacitors (i.e., the third variable capacitor and the fourth variable capacitor described below) are provided in which the capacitance changes in a direction different from the sliding direction, thereby appropriately detecting the amount of planar displacement at the displacement measurement point T.

[0177] That is, as shown in Figures 13 to 16, the RFID tag 100 of this embodiment has a configuration that, in addition to a first variable capacitor 201 and a second variable capacitor 202, it is also equipped with a third variable capacitor 203 and a fourth variable capacitor 204 whose capacitance changes when the sliding direction is a direction different from the direction in which changes in capacitance in the first variable capacitor 201 and the second variable capacitor 202 are detected (for example, a vertical direction is preferable).

[0178] With this configuration, the RFID tag 100 of this embodiment can output two-dimensional position changes in the same object (structure OB) to the outside as information on changes in the capacitance of the capacitor, making it possible to easily detect structural problems such as cracks or fissures in the structure OB that are difficult to detect by visual inspection or simple measurement, and is also capable of being used repeatedly and of properly detecting the amount of displacement.

[0179] As with the first and second embodiments, the RFID tag 100 of this embodiment can be manufactured more easily and inexpensively because the number of parts can be reduced.

[0180] In addition, in this embodiment, the configuration other than the above-mentioned characteristic points is the same as that of the first embodiment, and the same members are given the same reference numerals and the description thereof will be omitted.

[0181] The RFID tag 100 of this embodiment will be described taking as an example a case in which the first base material 110 and the third base material are integrally formed.

[0182] [C2] General Configuration of RFID Tag Next, the general configuration of the RFID tag 100 of this embodiment will be described.

[0183] As shown in Figures 13 to 16, the RFID tag 100 of this embodiment has a first substrate 110 fixedly installed on a structure OB (first object), a second substrate 120 fixedly installed on the structure OB at a second reference position P2 separate and independent of the first substrate 110 and different from the first reference position P1, and a third substrate 150 which is a substrate fixedly installed on the structure OB at a third reference position P3 separate and independent of at least the second substrate 120 and different from the first reference position P1 and the second reference position P2, and which is fixedly installed opposite the first substrate 110 and the second substrate 120.

[0184] Furthermore, as shown in Figures 13 to 16, the RFID tag 100 of this embodiment has guide rails 151 and 152 that slide the first substrate 110, the second substrate 120, and the third substrate 150 in a first direction and a second direction different from the first direction (for example, a direction perpendicular to the first direction) while maintaining the first substrate 110, the second substrate 120, and the third substrate 150 facing each other.

[0185] In addition, guide rail 151 is a rail that controls sliding in the first direction and also functions as a stopper for sliding in the second direction, and guide rail 152 is a rail that controls sliding in the second direction and also functions as a stopper for sliding in the first direction.

[0186] As shown in Figures 13 to 16, the RFID tag 100 of this embodiment has a first capacitor circuit 260 whose capacitance changes with sliding in a first direction, a second capacitor circuit 270 whose capacitance changes with sliding in a second direction, and communication circuit units 300 and 301 that transmit information indicating the change in capacitance of the first capacitor circuit 260 and the change in capacitance of the second capacitor circuit 270 as change information.

[0187] Specifically, the first capacitor circuit 260 is composed of a first electrode (hereinafter referred to as the "first electrode for the first variable capacitor") 21 that is disposed on the sliding surface on the first substrate 110 where the first substrate 110 and the second substrate 120 slide, and that is disposed along a first direction, and a second electrode (hereinafter referred to as the "second electrode for the first variable capacitor") 22 (220) that is disposed on the sliding surface on the second substrate 120, and that is disposed along the first direction, and has a first variable capacitor 201 whose capacitance changes in accordance with the change in area due to the sliding in the first direction of the opposing regions of the first electrode for the first variable capacitor 21 and the second electrode for the first variable capacitor 22 (220).

[0188] The second capacitor circuit 270 is composed of a first electrode (hereinafter referred to as the "first electrode for the third variable capacitor") 25 that is disposed on the sliding surface on the third substrate 150 where the second substrate 120 and the third substrate 150 slide, and that is disposed along the second direction, and a second electrode (hereinafter referred to as the "second electrode for the third variable capacitor") 26 (220) that is disposed on the sliding surface on the first substrate 110, and that is disposed along the second direction, and has a variable capacitor (i.e., the above-mentioned third variable capacitor) 203 whose capacitance changes in accordance with the change in area due to the sliding of the opposing regions of the first electrode for the third variable capacitor 25 and the second electrode for the third variable capacitor 26 (220).

[0189] In particular, the first capacitor circuit 260 of this embodiment further includes a variable capacitor (i.e., the above-described second variable capacitor) 202 electrically connected in series to the first variable capacitor 201, as shown in FIG.

[0190] As shown in FIG. 16 , the second variable capacitor 202 is formed from a first electrode (hereinafter referred to as the “first electrode for the second variable capacitor”) 23 (220) arranged on the sliding surface of the second substrate 120, and a second electrode (hereinafter referred to as the “second electrode for the second variable capacitor”) 24 arranged on the sliding surface of the first substrate 110, and has a configuration that functions as a variable capacitor whose capacitance changes in accordance with the change in area due to the sliding of the opposing regions of the first electrode for the second variable capacitor 23 and the second electrode for the second variable capacitor 24.

[0191] As shown in FIG. 16, the second capacitor circuit 270 further includes a variable capacitor (that is, the above-mentioned fourth variable capacitor) 204 electrically connected in series to the third variable capacitor 203 .

[0192] As shown in FIG. 16 , the fourth variable capacitor 204 is formed from a first electrode (hereinafter referred to as the “first electrode for the fourth variable capacitor”) 27 (220) disposed on the sliding surface of the second substrate 120, and a second electrode (hereinafter referred to as the “second electrode for the fourth variable capacitor”) 28 disposed on the sliding surface of the third substrate 150, and has a configuration in which the fourth variable capacitor functions as a variable capacitor whose capacitance changes in accordance with the change in area due to the sliding of the opposing regions of the first electrode for the fourth variable capacitor 27 (220) and the second electrode for the fourth variable capacitor 28.

[0193] With this configuration, the RFID tag 100 of this embodiment can output two-dimensional position changes of the same object or two-dimensional position changes of two objects to the outside as information on changes in the capacitance of a capacitor, making it possible to easily detect structural problems that are difficult to detect by visual inspection or simple measurement, such as cracks or fissures in a structure or the inclination of the structure, and is also capable of repeated use and appropriately detecting the amount of displacement.

[0194] The second capacitor circuit 270 of this embodiment basically has the same configuration as the first capacitor circuit 260, except for the sliding direction.

[0195] In addition, in this embodiment, as shown in Figure 16, the second electrode 22 for the first variable capacitor, the first electrode 23 for the second variable capacitor, the second electrode 26 for the third variable capacitor, and the first electrode 27 for the fourth variable capacitor are integrally formed as a flat electrode 220.

[0196] Furthermore, in this embodiment, both the first capacitor circuit 260 and the second capacitor circuit 270 are formed by two variable capacitors, but as in the first embodiment, they may also be formed by one variable capacitor and a contact structure that can be physically and electrically connected even when sliding.

[0197] [D] Modifications [D1] Modification 1 Next, Modification 1 of the first and second embodiments will be described with reference to FIGS. 17A and 17B.

[0198] 17A and 17B are diagrams for explaining this modified example 1, and are usage state diagrams (cross-sectional views) showing the usage state of the RFID tag 100 when the first substrate 110 and the second substrate 120 are arranged on different objects.

[0199] In the RFID tag 100 of the first and second embodiments described above, the first substrate 110 and the second substrate 120 of the RFID tag 100 are provided on the same object, but as shown in Figures 17A and 17B, the first substrate 110 and the second substrate may be provided on different objects.

[0200] For example, in this modified example, the RFID tag 100 may have the first substrate 110 disposed on a first object OB1 and the second substrate 120 disposed on a second object OB2, and may detect the size of the gap as a displacement measurement point.

[0201] [D2] Modification 2 Next, Modification 2 of the first and second embodiments will be described with reference to FIG.

[0202] FIG. 18 is a diagram for explaining the second modification, and is a diagram for explaining a detection method when a plurality of RFID tags 100 are used.

[0203] As shown in Figure 18, the displacement measurement point management system S of this modified example arranges multiple RFID tags 100 at different heights on an upright, immovable pole PL a predetermined distance away from the test building, and detects the gap between each upright, immovable pole PL and the building.

[0204] In this case, the displacement measurement point management system S of this modified example calculates the inclination of the building based on changes in the gaps between multiple RFID tags 100, and notifies the result to an administrator or the like via a display unit 590 or the like.

[0205] [D3] Modification 3 (Various Wireless Technologies) Next, a modification 3 of the RFID tag 100 of this embodiment will be described.

[0206] In this embodiment, the principles and methods of managing displacement measurement points using RFID tags 100 are explained, but in this modified example, short-range wireless technologies such as Bluetooth (registered trademark), Wi-Fi, and LPWA (Low Power Wide Area) may be used instead of RFID technology.

[0207] [D4] Modification 4 (Substrate on which a communication circuit section is mounted) Next, a modification of the RFID tag 100 of this embodiment will be described.

[0208] In each of the above embodiments, the communication circuit section 300 is mounted on the first substrate 110, but it may also be mounted on the second substrate 120 or the third substrate 150 (in the case of the third embodiment).

[0209] [D5] Modification 5 (Modification of the Capacitor Circuit in the Third Embodiment) Next, Modification 5 of the third embodiment will be described with reference to FIGS. 19 and 20. FIG.

[0210] 19 is a diagram for explaining modified example 5 of the above embodiment, and is a circuit layout diagram (bottom view) of the first substrate 110 of the RFID tag 100, and FIG. 20 is a usage state diagram (bottom view) of the RFID tag 100 in modified example 5, in which the first substrate 110 and the second substrate 120 are fitted together, showing the usage state of the RFID tag 100.

[0211] This modified example is characterized in that, in the RFID tag 100 of the third embodiment, the variable capacitor circuits 201 and 203 formed on the first substrate 110 and the third substrate 150, respectively, are formed by single variable capacitors 21 and 23, and each connection terminal 113 is slid over the flat electrode 220 to achieve electrical connection between each variable capacitor 21 and 23 and the communication circuit section 300.

[0212] That is, this modified example is characterized in that, in the RFID tag 100 of the third embodiment that detects two-dimensional displacement, the variable capacitor circuits 201 and 203 each have a setting structure similar to that of the first embodiment, and the configuration other than this characteristic point is similar to that of the third embodiment, and the same components are given the same symbols and their description will be omitted.

[0213] Specifically, as shown in Figures 19 and 20, the RFID tag 100 of this modified example is composed of: (A1) a first contact structure (connection terminal 113a) that maintains the electrical connection between the variable capacitor 21 for the first capacitor circuit and the communication circuit section 300 when sliding in a first direction; (A2) a second contact structure (connection terminal 113b) that maintains the electrical connection between the variable capacitor 23 for the third capacitor circuit and the communication circuit section 300 when sliding in a second direction; and (A3) guide rails 151 and 152 that regulate the sliding of the first substrate 110 and the third substrate 150 in the first direction and the second direction, respectively.

[0214] The connection terminal 113 may have any structure that allows it to move in the plane of the planar electrode 220 .

[0215] [E] Others The present embodiment is not limited to the above-described embodiment, and various modifications are possible. For example, terms cited in the description of the specification or drawings as broadly defined or synonymous can be replaced with broadly defined or synonymous terms in other descriptions of the specification or drawings.

[0216] The present embodiment includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations with the same functions, methods, and results, or configurations with the same purpose and effect). The present embodiment also includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. The present embodiment also includes configurations that achieve the same effects or purposes as the configurations described in the embodiments. The present embodiment also includes configurations in which publicly known technology is added to the configurations described in the embodiments.

[0217] Although the embodiment of the present invention has been described in detail as above, it will be readily apparent to those skilled in the art that many modifications can be made without substantially departing from the novel features and effects of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention.

[0218] M: Marking S: Displacement measurement point management system T: Displacement measurement point 20: Base material 21: First electrode for first variable capacitor 22: Second electrode for first variable capacitor 23: First electrode for second variable capacitor 24: Second electrode for second variable capacitor 25: First electrode for third variable capacitor 26: Second electrode for third variable capacitor 27: First electrode for fourth variable capacitor 28: Second electrode for fourth variable capacitor 30: Fixing member 100: RFID tag 110: First base material 113: Connection terminal 120: Second base material 124: Stationary electrode 131: Guide rail 133: Guide stopper 141: Guide rail 150: Third base material 151: Guide rail 152: Guide rail 171: Main memory unit 200 : Variable capacitor 201 : First variable capacitor 202 : Second variable capacitor 203 : Third variable capacitor 204 : Fourth variable capacitor 210 : First electrode 220 : Planar electrode 224 : First electrode 230 : Second electrode 250 : Second variable capacitor 260 : First capacitor circuit 270 : Second capacitor circuit 300 : Communication circuit unit 400 : Marking 500 : Information processing device 510 : Processing unit 511 : Communication control unit 512 : Input reception processing unit 513 : Displacement management unit 514 : Display control unit 515 : Reading control unit 520 : Drawing unit 530 : Sound processing unit 540 : Reader / writer 560 : Operation input unit 570 : Storage unit 580 : Information storage medium 590 : Display unit 592: Sound output unit 596: Communication unit

Claims

1. A first substrate fixedly installed at a first reference position of a first object; a substrate fixedly installed at a second reference position different from the first reference position, or a substrate fixedly installed at a second reference position indicating a given position of a second object different from the first object, a second substrate installed separately and independently from the first substrate and facing the first substrate; a sliding means that slides at least one of the first substrate and the second substrate in accordance with displacement of the first reference position and the second reference position while maintaining the opposing state of the first substrate and the second substrate; a capacitor formed from a first electrode disposed on a sliding surface on the first substrate along which the first substrate and the second substrate slide, and a second electrode disposed on a sliding surface on the second substrate, the capacitance of which changes in accordance with a change in area due to the sliding of opposing regions of the first electrode and the second electrode; a transmitting means formed on either the first substrate or the second substrate, for transmitting, as change information, information indicating a change in capacitance of the variable capacitor due to sliding between the first substrate and the second substrate, wherein the first electrode and the second electrode are formed along a sliding direction indicating a sliding direction.

2. An information and communications terminal device according to claim 1, wherein the transmitting means has a transmitting circuit electrically connected to the variable capacitor, and the sliding means comprises: a contact structure that maintains the electrical connection between the variable capacitor and the transmitting circuit during the sliding; and a guide rail that restricts the sliding of the first substrate and the second substrate in the sliding direction.

3. An information and communications terminal device according to claim 1, further comprising a second capacitor electrically connected in series to the first capacitor representing the variable capacitor, the second capacitor being formed from a first electrode disposed on the sliding surface of the second substrate and a second electrode disposed on the sliding surface of the first substrate, and functioning as a variable capacitor whose capacitance changes in accordance with changes in area due to the sliding of the opposing regions of the first electrode and the second electrode.

4. An information communication terminal device according to claim 3, wherein the second electrode of the first capacitor and the first electrode of the second capacitor are integrally formed.

5. An information communication terminal device according to claim 1, wherein a displacement measurement point for measuring the displacement of the first object is formed between the first reference position and the second reference position along the sliding direction, or a boundary between the first object and the second object is formed along the sliding direction.

6. An information and communications terminal device according to claim 1, wherein a marking is formed on at least one of the first substrate and the second substrate that is visible from the outside and that enables the amount of movement when sliding in the sliding direction to be visually recognized.

7. A first substrate fixedly installed on a first object; a second substrate which is a substrate fixedly installed on the first object at a second reference position different from the first reference position independently of the first substrate, or a substrate fixedly installed at a second reference position indicating a given position of a second object different from the first object; a substrate fixedly installed on the first object or a second object at a third reference position different from the first and second reference positions independently of at least the second substrate, or a substrate fixedly installed at a third reference position indicating a given position of a third object different from the first and second objects, the third substrate fixedly installed facing the first substrate and the second substrate; sliding means which slides the first substrate, the second substrate, and the third substrate in a first direction and a second direction different from the first direction while maintaining the opposing states of the first substrate, the second substrate, and the third substrate, respectively; and a first capacitor circuit whose capacitance changes with the sliding in the first direction. a second capacitor circuit whose capacitance changes in accordance with sliding in the second direction; and a transmitting means for transmitting information indicating each of the changes in capacitance of the first capacitor circuit and the changes in capacitance of the second capacitor circuit as change information, wherein the first capacitor circuit is comprised of: a first electrode for the first capacitor circuit that is disposed on the first substrate on a sliding surface along which the first substrate and the second substrate slide, and that is disposed along the first direction; and a second electrode for the first capacitor circuit that is disposed on the sliding surface on the second substrate and that is disposed along the first direction, and has a first capacitor circuit variable capacitor whose capacitance changes in accordance with an area change due to sliding in the first direction of opposing regions of the first electrode for the first capacitor circuit and the second electrode for the first capacitor circuit,an information communication terminal device comprising: a first electrode for a second capacitor circuit that is disposed on the third substrate at a sliding surface where the second substrate and the third substrate slide and that is disposed along the second direction; and a second electrode for a second capacitor circuit that is disposed on the sliding surface of the second substrate and that is disposed along the second direction, and the capacitance of the second capacitor circuit changes in accordance with the change in area of ​​the opposing regions of the first electrode for the second capacitor circuit and the second electrode for the second capacitor circuit due to the sliding.

8. An information communication terminal device according to claim 7, wherein the first capacitor circuit further comprises a second variable capacitor electrically connected in series to the first variable capacitor representing the variable capacitor for the first capacitor circuit, the second variable capacitor being formed from a first electrode for the second variable capacitor disposed on the sliding surface of the second substrate and a second electrode for the second variable capacitor disposed on the sliding surface of the first substrate, and functions as a variable capacitor whose capacitance changes in accordance with the change in area due to the sliding of opposing regions of the first electrode for the second variable capacitor and the second electrode for the second variable capacitor, the second capacitor circuit further comprises a fourth variable capacitor electrically connected in series to the third variable capacitor representing the variable capacitor for the second capacitor circuit, the fourth variable capacitor being formed from a first electrode for the fourth variable capacitor disposed on the sliding surface of the second substrate and a second electrode for the fourth variable capacitor disposed on the sliding surface of the third substrate, An information communication terminal device that functions as a variable capacitor whose capacitance changes in accordance with the change in area due to the sliding of the opposing regions of the fourth variable capacitor first electrode and the fourth variable capacitor second electrode.

9. An information communication terminal device according to claim 8, wherein the second electrode for the first variable capacitor, the first electrode for the second variable capacitor, the second electrode for the third variable capacitor, and the first electrode for the fourth variable capacitor are integrally formed.

10. An information and communications terminal device according to claim 7, wherein the transmitting means has a transmitting circuit electrically connected to the first capacitor circuit and the second capacitor circuit, and the sliding means comprises: a first contact structure that maintains the electrical connection between the variable capacitor for the first capacitor circuit and the transmitting circuit when sliding in a first direction; a second contact structure that maintains the electrical connection between the variable capacitor for the second capacitor circuit and the transmitting circuit when sliding in a second direction; and guide rails that regulate the sliding of the first substrate and the third substrate in each of the first and second directions.

11. A displacement management system comprising: an information communication terminal device according to claim 1 or 7; and a displacement detection processing device that receives change information transmitted from the information communication terminal device and detects a displacement between at least two substrates based on the received change information.

Images