JP5023797B2 - Detection device for detecting presence / absence of object, specific position or passage - Google Patents

Description

  The present invention, for example, is used for detecting the presence of an object in a load transfer device, or detecting the end of a stroke or detecting the passage of a carriage or a hanger in a conveyor device. It relates to the device.

As a detection device that detects the presence or absence of an object, in a load detection device that detects that a load is loaded on the tip fork of a slide fork used in a handling machine such as a conveyor, forklift or crane, a limit switch is provided on the tip fork. (For example, refer to Patent Document 1). A detector for detecting a load loaded on the receiving member of the tip fork by the detector and transmitting this load detection signal to the fixed side. An apparatus that accommodates and protects a transmission cable in a cable chain, and an article transfer apparatus that is movable on the movable side of the article transfer apparatus used in the cargo handling machine. An article detection unit that detects the presence or absence of an article, a wireless communication unit that can communicate the detection information to the outside by wireless communication, and a battery that supplies power to them. The fixed-side control unit is also provided with a wireless communication unit, wireless communication is performed between the movable side and the fixed-side wireless communication unit, and the detection information of the article detection unit is transmitted to the fixed-side control unit. (For example, refer to Patent Document 2).
As a detection device for detecting a specific position or passage of an object, a detection device using a detector such as a limit switch (for example, see Patent Document 1) or a proximity switch (for example, see Patent Document 3) has a stroke. It is widely used for end detection or detection of passage of a carriage or hanger in a conveyor device.

JP 2003-31073 A (FIGS. 1-2, 20 and 22-23) JP 2006-160506 A (FIG. 2-7) JP 2004-119370 A (FIGS. 1-2 and 17)

In the detection device for detecting the presence / absence, specific position or passage of the conventional object as described above, in the configuration for transmitting the load detection signal of the detector on the tip fork to the fixed side by the cable housed in the cable chain, Since the cable chain moves in the longitudinal direction of the slide fork as the fork slides, the occupied space increases, and the cable for the load detection signal may be bent repeatedly in the cable chain.
Moreover, since the structure of patent document 2 requires a battery on a mounting part, replacement | exchange or charge of this battery is troublesome, and when the electric power of a battery falls by discharge, a stock detection can be performed. It may disappear. In addition, a wireless communication unit is provided in the movable-side mounting unit and the fixed-side control unit, and is configured to transmit the inventory detection information to the fixed-side control unit by performing wireless communication using Bluetooth (registered trademark). Becomes relatively complex.
Furthermore, in the configuration of a detection device that detects a stroke end using a detector such as a limit switch or a proximity switch or detects the passage of a carriage or a hanger in a conveyor device, in particular, a configuration in which a detector is installed on the movable side. Wiring processing becomes complicated.

  Therefore, in view of the above-described situation, the present invention intends to solve the problem of preventing the disconnection of the cable by suppressing the increase in occupied space and eliminating the need for the wiring process between the movable detector and the fixed side. It is possible to provide a detection device that can detect the presence / absence, a specific position, or passage of an object that can be used and can eliminate the need for a detector battery on the movable side.

  In order to solve the above problems, a detection device for detecting the presence / absence, specific position or passage of an object according to the present invention includes a container made of a radio wave shielding material, an RFID tag accommodated in the container, A detector comprising an operating member that moves by contact and an urging member that urges the operating member in a direction opposite to the moving direction, and communication with a reader when the RFID tag is housed in the housing body When the operation member moves due to the contact of the object, the container is opened or the RFID tag protrudes from the container due to the driving force. In this state, the RFID tag and the reader When communication is possible and the contact of the object with the operation member is lost, the RFID tag is returned to the state of being accommodated in the container by the urging force of the urging member. It is.

  Here, it is preferable that the RFID tag is a passive type that electromagnetically generates electric waves transmitted from the reader and supplies power to the circuit of the RFID tag.

According to the detection device for detecting the presence / absence, specific position, or passage of an object according to the present invention, the container is made of a radio wave shielding material, the RFID tag housed in the container, and moved by contact of the object. A detector comprising an operating member and a biasing member that biases the operating member in a direction opposite to the moving direction; in a state where the RFID tag is housed in the housing body, communication with a reader becomes impossible; When the operating member moves due to the contact of the object, the container is opened or the RFID tag protrudes from the container by the driving force, and in this state, the RFID tag and the reader can communicate with each other. When the object is no longer in contact with the operation member, the biasing force of the biasing member returns the RFID tag to the state of being accommodated in the container. If the RFID tag is not in contact, the RFID tag cannot communicate with the reader, and even if the reader sends a command message to the RFID tag through the antenna, the response message from the RFID tag cannot be received. The state in which the object is not in contact can be recognized, and in the state in which the object is in contact with the operation member, the reader can receive the response message. Can be recognized.
Therefore, with a simple configuration that switches between the state in which the RFID tag is accommodated in the container and the state in which the RFID tag is exposed from the container depending on whether the object is in contact with the operation member, the movable detector and the fixed side Therefore, it is possible to easily and reliably detect the presence / absence of an object, a specific position, or the passage of an object, and an increase in occupied space can be suppressed. Since there is no disconnection due to repeated bending, the presence / absence of an object, a specific position, or reliability of passage detection can be ensured over a long period of time.

  Further, if the RFID tag is a passive type that electromagnetically generates electric waves transmitted from the reader and supplies power to the circuit of the RFID tag, in addition to the above effects, a movable detector battery is unnecessary. In particular, the detector can be made smaller and thinner. In addition, since replacement or charging of the battery can be eliminated, maintenance cost can be reduced. Furthermore, since the problem of running out of the battery where the power of the battery decreases due to the discharge and becomes impossible to detect is eliminated, the reliability of the presence / absence of an object, a specific position or passage detection is further improved.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste.
The detection device for detecting the presence / absence, specific position or passage of an object according to the present invention is an application of RFID (Radio Frequency Identification) capable of reading out data in a semiconductor memory in a non-contact manner by an induced magnetic field or radio wave, Communication in which the RFID tag is accommodated in a container made of a radio wave shielding material and communication between the RFID tag and the reader (reading device) is disabled, and communication that enables the communication by exposing the RFID tag. There are two possible states.
In the slide fork in the following description of the present specification, the expansion / contraction direction (the direction in which the tip fork moves forward / backward) is the front-rear direction (the arrow F in FIG. 2 is the front), and the left and right are the front.

FIGS. 1 to 5 are explanatory views showing an example in which the detection device for detecting presence / absence, a specific position or passage of an object according to an embodiment of the present invention is used for detecting the presence of a slide fork. FIG. 2 is a perspective view showing a state in which the slide fork is extended, FIG. 3 is a longitudinal sectional view, FIG. 4 is a perspective view of the detector, and FIG. 5 includes a detector, a reader, and the like. It is a perspective view which shows the structural example of a detection apparatus. 4A shows a state where no load is loaded on the load receiving member, and FIG. 4B shows a state where a load is loaded on the load receiving member.
As shown in FIGS. 1 to 3, the slide fork 20 is slidable in the longitudinal direction with respect to the fixed fork 21, the intermediate fork 22 supported to be slidable in the longitudinal direction with respect to the fixed fork 21, and the intermediate fork 22. A driving mechanism such as a driving mechanism such as a driving chain (not shown) that drives and slides the intermediate fork 22 with respect to the supported tip fork 23 and the fixed fork 21, and an intermediate fork in conjunction with the slide of the intermediate fork 22 22 includes an interlocking mechanism such as an interlocking chain 25 and 26 for sliding the tip fork 23 relative to 22 and detectors 2 and 2 that are attached to the load receiving members 27 and 27 of the tip fork 21 and detect the load.

2 and 3, vertical rollers 21A,... And horizontal rollers 21B,... Are provided on the inner surfaces of the left and right side walls of the fixed fork 21, and vertical rollers 23A,. ,... Are attached, and upper and lower guide grooves 22A, 22B,.
.. And the horizontal rollers 21B,... Are engaged with the lower guide grooves 22B, 22B on the left and right of the intermediate fork 22, and the vertical rollers 23A,. ,... Are engaged with the left and right upper guide grooves 22A, 22A of the intermediate fork 22, as described above, the fixed fork 21, the intermediate fork 22, the intermediate fork 22 and the tip fork 23 can slide relative to each other in the front-rear direction. It becomes.

As shown in FIGS. 1 to 3, the fixed fork 21 is attached with a rotation drive device 24 which is a geared motor having an orthogonal shaft configuration using, for example, a hypoid gear or a bevel carrier, and the output shaft of the rotation drive device 24 is attached to the fixed fork 21. Is connected to and fixed to a driving sprocket that rotates around the left and right axis, and the driving sprocket and the end of the driving chain that spans the idle sprocket and tension sprocket are fixed to the front and rear ends of the intermediate fork 22, By driving the drive chain via the drive sprocket by the rotary drive device 24, the intermediate fork 22 slides in the front-rear direction with respect to the fixed fork 21 as described above.
Further, an interlocking sprocket that rotates around the left-right axis is disposed at the front and rear of the intermediate fork 22, and the interlocking first chain 25 with one end fixed to the front end of the front fork 23 is an intermediate The second chain for interlocking 26, which is stretched over the rear interlocking sprocket of the fork 22, is fixed at the front end of the fixed fork 21, and is fixed at the rear end of the front fork 23, is an intermediate fork Since the other end is fixed to the rear end portion of the fixed fork 21, the intermediate fork 22 slides in the front-rear direction with respect to the fixed fork 21. The tip fork 23 is pulled by the front / rear interlocking first chain 25 or the interlocking second chain 26 while the interlocking sprocket rotates. Because, in conjunction with the operation of the intermediate fork 22, the tip fork 23 slides in the sliding direction in the same direction of the intermediate fork 22.
The configuration of the interlocking mechanism that slides the tip fork 23 in conjunction with the operation of the intermediate fork 22 is not limited to the above configuration using a chain and a sprocket, but a configuration using a rack and a pinion, etc. There may be.

Next, the configuration of the detector 2 will be described.
As shown in FIG. 4, on the right side surface of the base 28 of the load receiving member 27, a substantially L-shaped operation member 7 whose middle part is supported by a horizontal support shaft 7 </ b> A in the left-right direction and swings around the support shaft 7. And a pin 29 projecting to the right are attached, and terminals 9B and 9A of a tension coil spring 9 as an urging member are hooked on the through hole 7B at the lower end of the operating member 7 and the tip of the pin 29, respectively. Stopped.
A cylindrical body 3A that opens toward a substantially vertical surface below the horizontal support shaft 7A of the operation member 7 is attached to the right side surface of the base 28 of the load receiving member 27, and is attached to the substantially vertical surface of the operation member 7. A lid 3B is attached, and an RFID tag (RF tag, IC tag) 6 is attached to the lid 3B via a support 3C.
Here, the RFID tag 6 includes, for example, an antenna portion, an RF circuit for wireless communication, a logic circuit, and a semiconductor memory portion.

The cylindrical body 3 </ b> A and the lid body 3 </ b> B are made of a radio wave shielding material made of, for example, a metal such as aluminum, copper, or steel, and constitute a housing 3 that houses the RFID tag 6. The container 3 may be manufactured by attaching a metal tape to the surface of the synthetic resin, or may reflect (do not transmit) an induced magnetic field or radio wave transmitted from an antenna 16B of the reader 16 described later. Further, the shape is not limited to the cylindrical shape, and the RFID tag 6 may be accommodated.
Therefore, in the state where no load is loaded on the load receiving member 27 shown in FIG. 4A, the opening of the cylindrical body 3A is closed by the lid 3B. In this state, the reader 16 and the RFID tag 6 described later are used. Cannot communicate with each other.
On the other hand, in a state where the load is loaded on the load receiving member 27 shown in FIG. 4B (the load is not shown), the operation member 7 swings around the horizontal support shaft 7A by the contact of the load (object). At the same time, the RFID tag 6 accommodated in the container 3 swings together with the lid 3B and the support 3C, and the container 3 opens and the RFID tag 6 is exposed. Communication with the tag 6 is possible.
In addition, when the load is transferred from the state where the load is loaded on the load receiving member 27 to the state where the load is not loaded, a movement direction (swinging direction) in which the operation member 7 is moved by contact of the load (object) is set. The operation member 7, the lid 3B, the support 3C, and the RFID tag 6 are swung by the biasing force of the tension coil spring 9, which is a biasing member biasing in the reverse direction, and the communication impossible state shown in FIG. Return to.
The urging member is not limited to an elastic urging member such as the tension coil spring 9 and may be configured to be urged by its gravity using a weight or the like, or may be urged by such gravity. In this configuration, the operation member 7 and the separate member may be integrated.

Next, the configuration of the detection device 1 will be described.
The detection device 1 includes the detection device 2 and, for example, a reader 16 (may be a reader / writer), a protocol converter 17 and a programmable controller 18, and the reader 16 includes a control device 16A and an antenna 16B. A command message is transmitted to the RFID tag 6 through the antenna 16B by radio waves 19 and a response message from the RFID tag 6 is received by radio waves through the antenna 16B. The protocol converter 17 communicates between the reader 16 and the programmable controller 18. The programmable controller 18 uses the signal from the detector 2 to sequence control each device.
Here, the antenna 16 </ b> B is installed at an appropriate position within the communicable range with no shielding object between the RFID tag 6 in the communicable state where the RFID tag 6 is exposed.
Therefore, in a state where no load is loaded on the load receiving member 27 and the RFID tag 6 is not accommodated in the container 3 (see FIG. 4A), the reader 16 passes the RFID tag through the antenna 16B. 6, the response message from the RFID tag 6 cannot be received even if the command message is transmitted by the radio wave 19, so that it is possible to recognize that no load is loaded on the load receiving member 27, and the load receiving member 27 is loaded. Is loaded and the RFID tag 6 is exposed from the container 3 (see FIG. 4B), the reader 16 can receive the response message. Can be recognized.

  Therefore, the state in which the RFID tag 6 is accommodated in the container 3 and the state in which the RFID tag 6 is exposed from the container 3 indicate whether or not the load is loaded on the load receiving member 27 (the contact of the load on the operation member 7). With a simple configuration that switches depending on the presence / absence), it is possible to easily and reliably detect the presence / absence of load (presence / absence of object) while eliminating the need for wiring between the movable detector 2 and the fixed side. In addition, it is possible to improve the usability of the slide fork 20 by suppressing the increase in the load, and because the cable for the occupancy detection signal does not break due to repeated bending due to the expansion and contraction of the tip fork 23, the reliability of the occupancy detection Can be secured over a long period of time.

Here, when the RFID tag 6 is a passive type that electromagnetically generates electric waves 19 transmitted from the reader 16 (antenna 16B) and supplies power to the circuit of the RFID tag 6, the detector 2 for the movable side is used. Since the battery can be dispensed with, the detector 2 can be particularly reduced in size and thickness. In addition, battery replacement or charging work can be eliminated, and maintenance costs can be reduced. In addition, since the problem of running out of the battery where the power of the battery decreases due to the discharge and becomes impossible to detect is eliminated, the reliability of the inventory detection is further improved.
Note that the RFID tag 6 is not limited to the passive type, and may be an active type that continuously transmits an ID by radio waves from the RFID tag 6 side.

FIG. 6 is an explanatory diagram showing another configuration of a container that accommodates the RFID tag 6, and the same reference numerals as those in FIG. 4 indicate the same or corresponding parts. FIG. 6A shows a state where no load is loaded on the load receiving member, and FIG. 6B shows a state where a load is loaded on the load receiving member.
On the right side surface of the base 28 of the load receiving member 27, a lid body 4B directed to a substantially vertical surface below the horizontal support shaft 7A of the operation member 7 is attached, and the RFID tag is attached to the lid body 4B via a support body 4C. 6 is attached, and a cylindrical body 4A that opens toward the lid 4B is attached to the substantially vertical surface of the operation member 7.
Therefore, in the state where no load is loaded on the load receiving member 27 shown in FIG. 6A, the opening of the cylindrical body 4A is blocked by the lid body 4B. Therefore, in this state, the reader 16 (see FIG. 5). 6 and the RFID tag 6 cannot communicate with each other, and in a state in which a load is loaded on the load receiving member 27 shown in FIG. Since the cylinder 4A swings together with the operating member 7 swinging around the support shaft 7A, the container 4 is opened, and the RFID tag 6 attached to the lid 4B via the support 4C is exposed. Then, the reader 16 (see FIG. 5) and the RFID tag 6 can communicate with each other.
Therefore, the detector 2 using the container 4 in FIG. 6 has the same effect as the detector 2 using the container 3 in FIG.

FIG. 7 is a perspective view showing an example in which the detection device for detecting the presence / absence of an object, a specific position, or passage according to an embodiment of the present invention is used for detecting the presence of a hanger.
The hanger 30 is suspended by a transport carrier that can travel along a travel rail (not shown) to support the object to be transported, and is used for an overhead conveyor.
The detection of the presence of an object to be transported in the hanger 30 has not been conventionally performed because it is difficult to perform wiring processing from a detector for detecting the presence.
However, by attaching the detectors 2 to the load receiving members 27 of the hanger 30, it is possible to detect the presence of the hanger 30 that has not been realized in the past.

8-10 is explanatory drawing which shows another structure of a detector, FIG. 8 is a perspective view, FIG. 9 is a disassembled perspective view, FIG. 10 is operation | movement explanatory drawing. FIG. 10A shows a state where no object is in contact with the operating member, and FIG. 10B shows a state where the object is in contact with the operating member.
When the operation member 8 moves (swings) due to the contact of an object as shown in the two-dot chain line of FIG. 8 and FIG. 10B, the detector 2 detects the RFID tag from the opening 5C of the container 5 by the driving force. 6 protrudes, it is in a communicable state where communication with the reader 16 (see FIG. 5) is possible, and there is no contact of the object with the operation member 8 as shown by the solid line in FIG. 8 and FIG. 10 (a). In this case, since the RFID tag 6 returns to the state in which the RFID tag 6 is accommodated in the accommodating body 5 by the urging force of the tension coil spring 10 that is the urging member, it is not possible to communicate with the reader 16 (see FIG. 5). Communication is impossible.

Next, the details of the configuration and operation of the detector 2 will be described.
The container 5 includes a box 5A and a lid 5B made of a radio wave shielding material, and accommodates an RFID tag 6 and the like. The RFID tag 6, the base body 14, and the movable rack 15 are integrated, and the RFID The tag 6 is supported by the container 5 so as to be movable in the protruding direction (advancing and retracting direction).
The gear body 12 has a small-diameter gear 12A and a large-diameter gear 12B integrated. The small-diameter gear 12A meshes with a fixed rack 13 fixed in the housing 5, and the large-diameter gear 12B is connected to the movable rack 15. To mesh.
Further, the operating member 8 swings around the support shaft 8A, a roller 8B is attached to the free end portion on the outer side of the container 5, and a lever 8C extends on the inner side of the container 5, and the lever 8C. A pin 8D protrudes from the front end portion.
Furthermore, the swing lever 11 has a pin 11A protruding at the base end thereof loosely fitted in a through hole 12C at the center of the gear body 12 to form a rotation shaft, and the pin 11A and the gear body 12 are relatively swung. The pin 8D of the operation member 8 is loosely fitted in the through hole 11B formed at the free end of the swing lever 11 so as to be movable.
Further, the tension coil spring 10 has the terminal 10 </ b> A hooked on the housing 5 and the terminal 10 </ b> B hooked on the base 14.

With the configuration as described above, from the state in which the object is not in contact with the roller 8B of the operation member 8 shown in FIG. ), The lever 8C of the operating member 8 swings around the support shaft 8A, and the swing lever 11 swings around the pin 11A.
Since the small-diameter gear 12A meshes with the fixed rack 13, the gear body 12 moves in the protruding direction of the RFID tag 6 while rotating in the arrow A direction (refer to arrow B in the figure for this movement stroke). Since the movable rack 15 meshes with the large-diameter gear 12B of the gear body 12, the movable rack 15, the base 14 and the RFID tag 6 move in the protruding direction (refer to the arrow C in the figure for this moving stroke). The tag 6 is exposed to the outside from the opening 5C of the container 5.
Further, when the object is not in contact with the roller 8B from the state where the object is in contact with the roller 8B of the operation member 8 shown in FIG. 10B, the tension coil spring 10 as an urging member is removed. The base 14, the movable rack 15 and the RFID tag 6 are urged by the restoring force, so that the RFID tag 6 is accommodated in the accommodating body 5, and the large-diameter gear 12 </ b> B of the gear body 12 is fixed to the movable rack 15. Since the small-diameter gear 12A of the gear body 12 is engaged with the rack 13, as described above, the state returns to the state shown in FIG.
Here, when the ratio of the pitch circle diameters of the small-diameter gear 12A and the large-diameter gear 12B in the gear body 12 is, for example, 1: 2, the ratio of the moving stroke B to the moving stroke C is 1: 3. With such a compact detector 2 configuration, the movement stroke of the RFID tag 6 is expanded, and the RFID tag 6 can be moved back and forth from the container 5.

As can be seen from the above configuration and operation, the detector 2 shown in FIGS. 8 to 10 can detect the stroke end or the passage of a carriage or a hanger in the conveyor device, that is, specify the object. It can be replaced by a limit switch used as a detector in a detection device that detects position or passage. Moreover, it can be used also as a detector which detects the presence or absence of objects, such as presence detection.
Therefore, according to the configuration of the detector 2 shown in FIGS. 8 to 10, the state in which the RFID tag 6 is accommodated in the container 5 and the state in which the RFID tag 6 is exposed from the container 5 are With a simple configuration that switches depending on whether or not an object is in contact, the presence or absence of an object, a specific position, or passage can be easily and reliably detected without requiring wiring processing between the movable detector 2 and the fixed side. The increase in occupied space can be suppressed, and the cable between the movable detector 2 and the fixed side will not be disconnected due to repeated bending. The property can be secured over a long period of time.

It is a perspective view which shows the example which used the detection apparatus which detects the presence or absence of an object which concerns on embodiment of this invention, a specific position, or passage for the presence detection of the slide fork, and has shown the state which the slide fork contracted. Similarly, the slide fork is shown extended. It is a longitudinal cross-sectional view similarly. It is a perspective view of a detector, (a) shows a state where no load is loaded on the load receiving member, and (b) shows a state where a load is loaded on the load receiving member. It is a perspective view which shows the structural example of the detection apparatus containing a detector, a reader | leader, etc. FIG. It is explanatory drawing which shows another structure of the container which accommodates an RFID tag, (a) has shown the state which has not loaded the load on the load receiving member, (b) has shown the state which loaded the load on the load receiving member. . It is a perspective view which shows the example which used the detection apparatus which detects the presence or absence of an object which concerns on embodiment of this invention, a specific position, or passage for the loading of a hanger. It is a perspective view which shows another structure of a detector. It is an exploded perspective view similarly. FIG. 8 is an explanatory view of the operation, where (a) shows a state where no object is in contact with the operating member, and (b) shows a state where the object is in contact with the operating member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Detection apparatus 2 Detector 3, 4, 5 Container 3A, 4A Cylinder 3B, 4B Cover 3C, 4C Support body 5A Box 5B Cover 5C Opening 6 RFID tag 7, 8 Operation member 7A, 8A Support shaft 7B Through-hole 8B Roller 8C Lever 8D Pin 9, 10 Extension coil spring (biasing member)
9A, 9B, 10A, 10B Terminal 11 Swing lever 11A Pin 11B Through-hole 12 Gear body 12A Small-diameter gear 12B Large-diameter gear 12C Through-hole 13 Fixed rack 14 Base 15 Moving rack 16 Leader (reader / writer)
16A Controller 16B Antenna 17 Protocol converter 18 Programmable controller 19 Radio wave 20 Slide fork 21 Fixed fork 21A Vertical roller 21B Horizontal roller 22 Intermediate fork 22A, 22B Guide groove 23 Tip fork 23A Vertical roller 23B Horizontal roller 24 Rotation drive devices 25, 26 Interlocking Chain 27 Load receiving member 28 Base 29 Pin 30 Hanger

Claims (2)

A container made of radio wave shielding material;
An RFID tag housed in the container;
An operation member that moves by contact of an object;
A detector comprising a biasing member that biases the operating member in a direction opposite to the moving direction;
In a state where the RFID tag is accommodated in the accommodating body, communication with the reader becomes impossible,
When the operation member moves due to the contact of an object, the container is opened or the RFID tag protrudes from the container due to the driving force. In this state, the RFID tag and the reader can communicate with each other. ,
When the object is no longer in contact with the operation member, the presence or absence of the object is specified, wherein the RFID tag is returned to the state of being accommodated in the container by the biasing force of the biasing member. A detection device that detects position or passage. 2. The detection device for detecting presence / absence of an object, a specific position, or a passage according to claim 1, wherein the RFID tag is a passive type that electromagnetically generates electric waves generated from the reader and supplies electric power to a circuit of the RFID tag. .

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