JP2015007327A - Detector and locking/unlocking detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the reduction in detection accuracy of a locked/unlocked state because locking/unlocking of a lock device is operated many times.SOLUTION: An inventive detector is equipped with a strike box in which a recess is formed, and detects a locked/unlocked state of a lock device which is locked due to entrance of a movable body into the recess. The detector includes: a first electrode plate and a second electrode plate provided opposed to each other so as to form a gap through which the movable body approaches into the recess; a dielectric constant variable member for changing a dielectric constant between the first electrode plate and a second electrode plate according to an entrance state of the movable body into the recess; a measurement part for measuring the impedance between the first electrode plate and a second electrode plate; and a control part for detecting the locked/unlocked state of the lock device according to the impedance measured by the measurement part.

Description

  The present invention relates to a detection device and a lock / unlock detection method for detecting a lock / unlock state of a lock device.

  An example of a detection device that detects the locked / unlocked state of a lock device provided on a window, an entrance door, or the like is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 4-11177).

  Patent Document 1 discloses a detection device that detects a locking / unlocking state of a locking device including a dead bolt that moves in response to locking and unlocking, and a trowel having a recess into which the dead bolt can enter. And a resonance circuit including a state detection switch that is turned on in response to the entry of a dead bolt, and that detects a lock / unlock state using a resonance current that is generated in response to the state detection switch being turned on / off Is disclosed.

  In the detection device disclosed in Patent Document 1, a first electrical contact, a second electrical contact, a conductive mountain-shaped elastic bridge member having one end connected to the second electrical contact, A state detection switch is provided in the recess of the troyoke, the chevron of the elastic bridge is pressed by the dead bolt that has entered the recess of the troyoke, and the other end of the elastic bridge contacts the first electrical contact. The state detection switch is turned on when the first electrical contact and the second electrical contact are short-circuited.

JP-A-4-11177

  In the detection device disclosed in Patent Document 1, since the mechanical contact that mechanically contacts the metals is used, the contact between the metals is unstable if the lock device is unlocked many times. As a result, the impedance between the first electrical contact and the second electrical contact varies.

  In metal contacts, metal wear powder may be generated by repeated collision and contact of metal surfaces. The metal wear powder oxidizes and remains irregularly on the metal contact, thereby changing the impedance between the first electrical contact and the second electrical contact.

  In addition, if the state detection switch opens and closes when an electrical load is applied to the contact portion, an inrush arc (discharge phenomenon) that depends on the capacity of the resonance circuit occurs when the contact is closed, and the dielectric of the resonance circuit occurs when the contact is open. Long arcs that depend on sex occur. These arcs cause melting of the contact portion, generation of oxides and carbides on the contact surface, and the impedance between the first electrical contact and the second electrical contact varies.

  In the detection device disclosed in Patent Document 1, the resonance current of the resonance circuit also fluctuates due to the fluctuation of the impedance between the first electric contact and the second electric contact, and the detection accuracy of the unlocked state is increased. It will decline. As described above, in the detection device disclosed in Patent Document 1, there is a problem that the detection accuracy of the lock / unlock state of the lock device is lowered by performing the lock / unlock operation of the lock device many times. .

  An object of the present invention is to provide a detection device and a lock / unlock detection method that can suppress a decrease in detection accuracy of a lock / unlock state even when the lock device is locked and unlocked many times.

In order to achieve the above object, the detection device of the present invention comprises:
A detection device comprising a troyoke formed with a recess, and detecting a locking / unlocking state of a locking device locked by the entry of a movable body into the recess,
A first electrode plate and a second electrode plate provided facing each other so as to form a gap into which the movable body enters in the recess,
A dielectric constant variable member that changes a dielectric constant between the first electrode plate and the second electrode plate in accordance with an approach state of the movable body into the concave portion;
A measurement unit for measuring impedance between the first electrode plate and the second electrode plate;
And a control unit that detects an unlocked state of the lock device according to the impedance measured by the measurement unit.

In order to achieve the above object, the unlocking detection method of the present invention comprises:
A locking / unlocking detection method by a detecting device that includes a troyoke formed with a recess and detects a locking / unlocking state of a locking device locked by the entry of a movable body into the recess,
In the detection device,
A first electrode plate and a second electrode plate provided facing each other so as to form a gap into which the movable body enters in the recess,
A dielectric constant variable member that changes a dielectric constant between the first electrode plate and the second electrode plate in accordance with an approach state of the movable body into the concave portion;
Measuring the impedance between the first electrode plate and the second electrode plate;
The locking / unlocking state of the locking device is detected according to the measured impedance.

  ADVANTAGE OF THE INVENTION According to this invention, even if the locking / unlocking of a locking device is performed many times, the fall of the detection precision of a locking / unlocking state can be suppressed.

It is a figure which shows the example of attachment of the detection apparatus in the 1st Embodiment of this invention. It is a block diagram which shows the principal part structure of the detection apparatus shown in FIG. It is sectional drawing of the sensor part vicinity shown in FIG. It is sectional drawing of the sensor part vicinity shown in FIG. FIG. 4 is a cross-sectional view taken along line A-A ′ shown in FIG. 3. It is a figure which shows the circuit structural example of the impedance measurement circuit shown in FIG. It is a flowchart which shows operation | movement of the detection apparatus shown in FIG. It is sectional drawing of the sensor part vicinity in the 2nd Embodiment of this invention. It is sectional drawing of the sensor part vicinity in the 2nd Embodiment of this invention. It is sectional drawing of the sensor part vicinity in the 3rd Embodiment of this invention. It is sectional drawing of the sensor part vicinity in the 3rd Embodiment of this invention. It is a figure which shows the comparative example of the detection precision of the locking / unlocking state of the locking device by the detection apparatus in this invention and the related detection apparatus.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated with reference to drawings.

(First embodiment)
FIG. 1 is a diagram illustrating an example of attachment of the detection device 100 according to the first embodiment of the present invention.

  In addition, the detection apparatus which concerns on this invention detects the locking / unlocking state of the locking device 200 provided in the door 10. The lock device 200 is provided on the door 10, and is provided on a lock movable body 201 that is a movable body that can move according to a locking operation or an unlocking operation, such as a dead bolt or a sickle dead bolt, and a frame body 11 that surrounds the door 10. And a troyoke 202 formed with a recess into which the lockable movable body 201 can enter, and the lockable movable body 201 is locked by entering the recess of the troyoke 202.

  The detection apparatus 100 includes a sensor unit 110 and a processing unit 120 connected to the sensor unit 110 via wiring.

  The sensor unit 110 is provided in the trowel 202 of the lock device 200, detects vibrations acting on the trojoke 202, and outputs the detection result to the processing unit 120 via wiring. In addition, the sensor unit 110 has a pair of electrode plates provided in the concave portion of the troyoke 202, details of which will be described later.

  The processing unit 120 is bonded and fixed to the wall surface 12 provided with the frame 11 with an adhesive tape, detects the locking / unlocking state of the locking device 200, and outputs the detection result.

  A part of the wiring that connects the trolley 202, the sensor unit 110, and the sensor unit 110 and the processing unit 120 is provided in the frame 11. In FIG. 1, the configuration provided in the frame 11 is indicated by a broken line.

  Next, the configuration of the detection device 100 will be described.

  FIG. 2 is a block diagram illustrating a main configuration of the detection apparatus 100. 3 and 4 are cross-sectional views in the vicinity of the sensor unit 110 shown in FIG. FIG. 5 is a cross-sectional view taken along the line A-A ′ shown in FIG. 3. 3 shows a case where the lock device 200 is in a locked state, and FIG. 4 shows a case where the lock device 200 is in an unlocked state.

  A detection apparatus 100 illustrated in FIG. 2 includes a sensor unit 110 and a processing unit 120.

  The sensor unit 110 includes a first electrode plate 111, a second electrode plate 112, and a vibration sensor 113. In addition, the processing unit 120 is made of ABS resin, and a vibration detection circuit 121, an impedance measurement circuit 122, an MPU (Micro Processing Unit) 123, and a casing having a size of about 1500 mm × about 50 mm × about 30 mm, A communication circuit 124 and a battery 125 are included. The impedance measurement circuit 122 is an example of a measurement unit, and the MPU 123 is an example of a control unit.

  The first electrode plate 111 is bonded and fixed to the surface of the recess of the troyoke 202 facing the lockable movable body 201 with an insulating tape 114.

  The second electrode plate 112 is provided so as to face the first electrode plate 111 and form a gap into which the lockable movable body 201 enters. As shown in FIG. 5, the second electrode plate 112 is formed with a hole 112 a so that the lock movable body 201 can pass therethrough. By providing the hole portion 112 a, the lockable movable body 201 can enter the gap between the first electrode plate 111 and the second electrode plate 112.

  The size of the first electrode plate 111 and the second electrode plate 112 is, for example, about 50 mm × about 18 mm × about 0.8 mm. The material of the first electrode plate 111 and the second electrode plate 112 is, for example, phosphor bronze. The size of the hole 112a is, for example, about 30 mm × about 16 mm.

  As shown in FIGS. 3 and 4, at the front end of the lock movable body 201, there is a gap between the first electrode plate 111 and the second electrode plate 112 according to the approach state of the lock movable body 201 into the recess of the troyoke 202. As a dielectric constant variable member that changes the dielectric constant, a dielectric (urethane rubber) 203 is bonded and fixed with an adhesive tape. The size of the dielectric 203 is, for example, about 25 mm long × about 12 mm wide and about 0.5 mm thick. As the dielectric 203, various materials such as an acrylic resin, a polypropylene resin, and a phenol resin can be used in addition to urethane rubber.

  As described above, the lockable movable body 201 can enter the gap between the first electrode plate 111 and the second electrode plate 112. When the lock device 200 is in the locked state, the dielectric 203 provided at the tip of the lock-unlocking movable body 201 is located between the first electrode plate 111 and the second electrode plate 112 as shown in FIG. When the lock device 200 is in the unlocked state, it does not exist between the first electrode plate 111 and the second electrode plate 112 as shown in FIG. That is, the dielectric 203 provided at the front end of the lockable movable body 201 between the first electrode plate 111 and the second electrode plate 112 in accordance with the approach of the lockable movable body 201 into the recess of the troyoke 202 Move through the gap.

  The vibration sensor 113 is installed on the trowel 202, the frame body 11, or the wall 12 so that vibration generated in accordance with the movement of the unlocking movable body 201 due to the locking and unlocking of the lock device 200 can be measured. In the present embodiment, the vibration sensor 113 is bonded and fixed to the upper surface of the troyoke 202 with a double-sided adhesive tape. When the vibration sensor 113 is provided on the top surface of the troyoke 202, the vibration sensor 113 can be fixed by a simple method such as adhesion using a double-sided adhesive tape.

  As the vibration sensor 113, for example, a piezoelectric type acceleration sensor having a built-in signal amplification circuit can be used. The size of the vibration sensor 113 is, for example, length of about 8 mm × width of about 8 mm × height of about 4 mm. The vibration sensor 113 and the wiring are covered with a covering member 115.

  When the vibration sensor 113 detects a vibration (acceleration) greater than or equal to a predetermined value, the vibration detection circuit 121 outputs a detection signal indicating that vibration greater than the predetermined value has been detected to the MPU 123. The vibration detection circuit 121 includes, for example, an analog filter circuit and a Schmut trigger circuit.

  The analog filter circuit outputs a component having a frequency higher than a predetermined cutoff frequency (for example, about 80 Hz) out of the acceleration measured by the vibration sensor 113 to the Schmitt trigger circuit without being attenuated, and is lower than the cutoff frequency. This is a bypass filter that reduces frequency components.

  The Schmut trigger circuit has two threshold values. When the potential of the output signal from the analog filter circuit exceeds a high threshold value, a signal having a high logic level (indicating that a vibration exceeding a predetermined value has been detected). Detection signal), and when the potential of the input signal falls below a low threshold value, a signal having a logic level of Low is output. The Schmitt trigger circuit outputs a signal having the same logic level as the signal output immediately before the potential of the output signal from the analog filter circuit is between the low threshold value and the high threshold value. .

  The impedance measurement circuit 122 measures the impedance between the first electrode plate 111 and the second electrode plate 112 and outputs the measurement result to the MPU 123.

  FIG. 6 is a diagram illustrating a circuit configuration example of the impedance measurement circuit 122.

  In the impedance measurement circuit 122, the first electrode plate 111 is connected to one end of the AC power supply 301, one end of the resistor 302 is connected to the other end of the AC power supply 301, and the second electrode plate 112 is connected to the other end of the resistor 302. It is a connected configuration. That is, assuming that the impedance between the first electrode plate 111 and the second electrode plate 112 is Zx, the impedance measurement circuit 122 has an impedance Zx and a resistor 302 in series with the AC power supply 301 as shown in FIG. It is the structure connected to.

  When the voltage value of the AC voltage output from the AC power supply 301 is V1, the voltage value at both ends of the resistor 302 is V2, and the resistance value of the resistor 302 is R, the impedance Zx is obtained by Zx = V1 / V2 * R. be able to. Since the voltage V1 and the resistance R are known, the impedance Zx can be obtained by measuring the voltage V2. The AC voltage is, for example, 0.2 V, the AC frequency is 100 Hz, and the resistance value (R) of the resistor 302 is 1Ω.

  When the MPU 123 outputs a detection signal indicating that vibration of a predetermined value or more has been detected from the vibration detection circuit 121, the impedance between the first electrode plate 111 and the second electrode plate 112 is output to the impedance measurement circuit 122. Let Zx be measured. Further, the MPU 123 determines whether the lock device 200 is in the locked state or in the unlocked state according to the impedance Zx measured by the impedance measuring circuit 122.

  The communication circuit 124 communicates with an external device (not shown) by wire or wireless.

  The battery 125 supplies power to the MPU 123 and the communication circuit 124.

  Next, operation | movement of the detection apparatus 100 is demonstrated with reference to the flowchart shown in FIG.

  When the sensor unit 110 is installed on the trolley 202, the processing unit 120 is installed on the wall 12, and the power of the detection device 100 is turned on, the MPU 123 enters a standby state (step S11).

For example, the vibration detection circuit 121 determines whether or not the vibration sensor 113 detects an acceleration equal to or higher than a predetermined value at predetermined time intervals. For example, a value of about 1.0 m / s ² is set as the predetermined value.

  When it is determined that the acceleration equal to or greater than the predetermined value is not detected (step S12: No), the vibration detection circuit 121 outputs a signal having a logic level of Low to the MPU 123. In this case, the MPU 123 maintains a standby state (step S11).

  If it is determined that an acceleration equal to or greater than a predetermined value has been detected (step S12: Yes), the vibration detection circuit 121 outputs a signal whose logic level is High (a detection signal indicating that vibration greater than the predetermined value has been detected) to the MPU 123. Output to.

  When the detection signal is input from the vibration detection circuit 121, the MPU 123 is activated (step S13), and instructs the impedance measurement circuit 122 to measure the impedance Zx. The impedance measurement circuit 122 receives an instruction from the MPU 123, measures the impedance Zx (step S14), and outputs the measurement result to the MPU 123. As described above, when the detection signal is output from the vibration detection circuit 121, the MPU 123 is activated, and the impedance measurement circuit 122 performs the measurement of the impedance Zx, so that the power consumption can be reduced. The processing unit 120 can be downsized by reducing the size of the battery 125.

  The MPU 123 determines whether or not the impedance Zx measured by the impedance measurement circuit 122 is equal to or less than a predetermined threshold Th (Step S15).

  Here, when the locking device 200 is in a locked state, the dielectric 203 exists between the first electrode plate 111 and the second electrode plate 112 as shown in FIG. On the other hand, when the locking device 200 is in the unlocked state, the dielectric 203 does not exist between the first electrode plate 111 and the second electrode plate 112 as shown in FIG.

  Therefore, the dielectric constant between the first electrode plate 111 and the second electrode plate 112 changes according to the state of entry of the lockable movable body 201 into the recess of the trowel 202, and as a result, the first electrode plate The impedance Zx between 111 and the second electrode plate 112 also changes depending on whether the locking device 200 is in the locked state or in the unlocked state. Specifically, the impedance Zx when the locking device 200 is in the unlocked state is larger than the impedance when the locking device 200 is in the locked state.

  As the predetermined threshold Th, for example, a value that is 0.5 times the impedance Zx measured when the locking device 200 is in the unlocked state is set.

  Therefore, by comparing the impedance Zx measured by the impedance measurement circuit 122 with the predetermined threshold Th, it is possible to determine whether the locking device 200 is in the locked state or the unlocked state.

  When it is determined that the impedance Zx measured by the impedance measurement circuit 122 is equal to or less than the predetermined threshold Th (step S15: Yes), the MPU 123 determines that the lock device 200 is in a locked state (step S16).

  On the other hand, when it is determined that the impedance Zx measured by the impedance measurement circuit 122 is greater than the predetermined threshold Th (step S15: No), the MPU 123 determines that the lock device 200 is in the unlocked state (step S17). ).

  The MPU 123 outputs the detection result after detecting the locking / unlocking state of the lock device 200. Here, as a detection result output method, the processing unit 120 is provided with a red LED (Light Emitting Diode) and a green LED, and when the MPU 123 determines that the locking device 200 is in a locked state, the red LED is turned on. If the lock device 200 is determined to be in the unlocked state, there is a method of turning on the green LED. Further, the MPU 123 may transmit the detection result to a monitoring device or the like that monitors the locked / unlocked state of the lock device 200 via the communication circuit 124.

  As described above, in this embodiment, the detection device 100 includes the dielectric 203 provided at the tip of the lockable movable body 201 that can enter the recess of the troyoke 202 and the first electrode provided in the recess of the troyoke 202. A gap is formed between the plate 111 and the first electrode plate 111 so that the dielectric 203 moves between the first electrode plate 111 and the lockable movable body 201 entering the recess of the trowel 202. The second electrode plate 112 provided in the recess of the troyoke 202 is measured, and the impedance between the first electrode plate 111 and the second electrode plate 112 is measured, and the lock is made according to the measured impedance. The locking / unlocking state of the device 200 is detected.

  The position of the dielectric 203 between the first electrode plate 111 and the second electrode plate 112 in the locked state and the unlocked state due to the movement of the lock movable body 201 according to the locking and unlocking of the locking device 200. As a result, the impedance Zx between the first electrode plate 111 and the second electrode plate 112 also changes. Therefore, the locking / unlocking state of the locking device 200 can be detected by measuring the impedance Zx. In addition, unlike the method using mechanical contacts, there is no mechanical contact between metals, so even if the locking device 200 is locked and unlocked a number of times, a reduction in detection accuracy of the unlocked state is suppressed. can do.

(Second Embodiment)
FIG. 8 is a cross-sectional view of the vicinity of the sensor unit 110 when the locking device 200 is in the unlocked state according to the second embodiment of the present invention, and FIG. 9 is a case where the locking device 200 is in the locked state. FIG. 3 is a cross-sectional view in the vicinity of a sensor unit 110. 8 and 9, the same reference numerals are given to the same components as those in FIGS.

  In the first embodiment, the description has been given using the example in which the dielectric 203 is provided at the distal end of the lock movable body 201. However, in the present embodiment, the dielectric 203 provided at the distal end of the lock movable body 201. As a dielectric constant variable member that changes the dielectric constant between the first electrode plate 111 and the second electrode plate 112 according to the state of the lockable movable body 201 entering the recess of the troyoke 202, the dielectric (Urethane rubber) 401 is added.

  The dielectric 401 is provided on the first electrode plate 111 with a certain thickness. When the lock device 200 is locked, the dielectric 401 is pressed and deformed by the lock movable body 201 as shown in FIG. The dielectric 401 has a cross-section of about 25 mm × about 12 mm, and the length of the lock-moving movable body 201 in the moving direction is about 5 mm in the unlocked state and about 1.5 mm or less in the locked state.

  Due to the deformation of the dielectric 401, the dielectric constant between the first electrode plate 111 and the second electrode plate 112 changes, and as a result, the first electrode plate 111 and the second electrode plate 112 The impedance between them also varies depending on whether the locking device 200 is in the locked state or in the unlocked state. Specifically, the impedance Zx when the locking device 200 is in the locked state is larger than the impedance when the locking device 200 is in the unlocked state.

  The MPU 123 detects that the locking device 200 is in the locked state if the impedance Zx measured by the impedance measuring circuit 122 is equal to or greater than the predetermined threshold Th, and if the impedance Zx is less than the predetermined threshold Th, the locking device 200. Is detected to be unlocked. As the predetermined threshold Th, a value that is 1.05 times the impedance Zx measured when the lock device 200 is in the unlocked state is set.

  Thus, in the present embodiment, the detection device includes the first electrode plate 111 provided in the recess of the troyoke 202 so as to be orthogonal to the moving direction of the lock movable body 201, and the first electrode plate 111. The second electrode plate 112 provided in the recess of the troyoke 202 and the first electrode plate 111 so as to form a gap that faces the first electrode plate 111 and the movable movable body 201 enters between the first electrode plate 111 and the first electrode plate 111. A dielectric 401 that is pressed by the approach of the lock movable body 201, measures the impedance between the first electrode plate 111 and the second electrode plate 112, and locks the lock according to the measured impedance. The locking / unlocking state of the device 200 is detected.

  When the dielectric 401 is pressed by the movement of the lock movable body 201 in accordance with the locking / unlocking of the locking device 200, the dielectric 401 is deformed, and as a result, the first electrode plate in the locked state and the unlocked state. The impedance Zx between 111 and the second electrode plate 112 also changes. Therefore, by measuring the impedance Zx, the locking / unlocking state of the locking device 200 can be detected as in the first embodiment. In addition, unlike the method using the mechanical contact, the mechanical contact between the metals does not occur. Therefore, as in the first embodiment, even when the locking device 200 is locked and unlocked many times, A decrease in detection accuracy of the lock state can be suppressed.

(Third embodiment)
FIG. 10 is a cross-sectional view of the vicinity of the sensor unit 110 when the locking device 200 is in a locked state according to the third embodiment of the present invention, and FIG. 11 is a case where the locking device 200 is in an unlocked state. FIG. 3 is a cross-sectional view in the vicinity of a sensor unit 110. 10 and 11, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted.

  In the first embodiment, the first electrode plate 111 and the second electrode plate 112 are arranged in a direction substantially orthogonal to the moving direction of the lock movable body 201. In the present embodiment, however, The first electrode plate 111 </ b> A and the second electrode plate 112 </ b> A are arranged in a direction substantially parallel to the moving direction of the lock movable body 201.

  The first electrode plate 111 </ b> A is provided on the upper surface of the concave portion of the Troyoke 202.

  The second electrode plate 112A is opposed to the first electrode plate 111A on the lower surface of the recess of the troyoke 202, and in response to the locking movable body 201 entering the recess of the troyoke 202 between the first electrode plate 111A. Thus, the dielectric 203 provided at the tip of the lock movable body 201 is provided so as to form a gap in which it moves.

  In the present embodiment, since the first electrode plate 111A and the second electrode plate 112A are arranged in a direction substantially parallel to the moving direction of the lock movable body 201, the second electrode plate 112A includes There is no need to provide a hole for allowing the lock movable body 201 to pass therethrough.

  The size of the first electrode plate 111A and the second electrode plate 112A is about 15 mm × about 15 mm × about 0.8 mm, and the material of the first electrode plate 111A and the second electrode plate 112A is phosphorous. Bronze.

  In the arrangement of the first electrode plate 111A and the second electrode plate 112A as described above, when the lock device 200 is in the locked state, as shown in FIG. The dielectric 203 exists between the first electrode plate 111A and the second electrode plate 112A. On the other hand, when the locking device 200 is in the unlocked state, as shown in FIG. 11, the dielectric 203 is not present between the first electrode plate 111A and the second electrode plate 112A.

  Therefore, the dielectric constant between the first electrode plate 111A and the second electrode plate 112A changes according to the state of entry of the lockable movable body 201 into the recess of the trowel 202, and as a result, the first electrode plate The impedance Zx between 111A and the second electrode plate 112A also changes between when the locking device 200 is in the locked state and when it is in the unlocked state. Specifically, the impedance Zx when the locking device 200 is in the unlocked state is larger than the impedance when the locking device 200 is in the locked state.

  The MPU 123 detects that the locking device 200 is in a locked state if the impedance Zx measured by the impedance measuring circuit 122 is equal to or less than the predetermined threshold Th, and if the impedance Zx is greater than the predetermined threshold Th, the MPU 123 Detects unlocked state. As the predetermined threshold Th, a value 0.95 times the impedance Zx measured when the lock device 200 is in the unlocked state is set.

  As described above, in this embodiment, the detection device includes the first electrode plate 111 </ b> A and the second electrode plate 112 </ b> A provided in the concave portion of the troyoke 202 in a direction substantially parallel to the moving direction of the lock movable body 201. And measuring the impedance between the first electrode plate 111A and the second electrode plate 112A, and detecting the unlocked state of the locking device 200 according to the measured impedance.

  The position of the dielectric 203 between the first electrode plate 111A and the second electrode plate 112A in the locked state and the unlocked state due to the movement of the lock movable body 201 according to the locking and unlocking of the locking device 200. As a result, the impedance Zx between the first electrode plate 111A and the second electrode plate 112A also changes. Therefore, by measuring the impedance Zx, the locking / unlocking state of the locking device 200 can be detected as in the first embodiment. In addition, unlike the method using the mechanical contact, the mechanical contact between the metals does not occur. Therefore, as in the first embodiment, even when the locking device 200 is locked and unlocked many times, A decrease in detection accuracy of the lock state can be suppressed.

  In the first to third embodiments, the first electrode plate and the second electrode plate may be covered with a dielectric. By doing so, it is possible to avoid the corrosion of the electrode plate by the tentacles in the installation work of the electrode plate, and to extend the life of the detection device.

  Finally, FIG. 12 shows a comparison result of the detection accuracy of the locked state and the detection state in the detection device and the detection device using the mechanical contact in the first to third embodiments of the present invention.

  FIG. 12 shows the presence or absence of erroneous detection by the detection device and the detection device using the mechanical contacts in the first to third embodiments when locking and unlocking are repeated 1000 times.

  In the detection devices in the first to third embodiments, there was no erroneous detection of the locked state and the unlocked state. On the other hand, in the detection device using a mechanical contact, the resistance value becomes infinite even though the contact is in contact with the lock, and it is detected that it is in the unlocked state, resulting in false detection. There is.

  Thus, in the detection device according to the present invention, it is possible to suppress a decrease in detection accuracy of the lock / unlock state of the lock device even if the lock device is locked and unlocked many times.

DESCRIPTION OF SYMBOLS 10 Door 11 Frame 12 Wall 100 Detection apparatus 110 Sensor part 111,111A 1st electrode plate 112,112A 2nd electrode plate 112a Hole part 113 Vibration sensor 114 Insulating tape 115 Cover member 120 Processing part 121 Vibration detection circuit 122 Impedance measurement circuit 123 MPU
DESCRIPTION OF SYMBOLS 124 Communication circuit 125 Battery 200 Locking device 201 Locking movable body 202 Troyoke 203,401 Dielectric 301 AC power supply 302 Resistance

Claims (9)

A detection device comprising a troyoke formed with a recess, and detecting a locking / unlocking state of a locking device locked by the entry of a movable body into the recess,
A first electrode plate and a second electrode plate provided facing each other so as to form a gap into which the movable body enters in the recess,
A dielectric constant variable member that changes a dielectric constant between the first electrode plate and the second electrode plate in accordance with an approach state of the movable body into the concave portion;
A measurement unit for measuring impedance between the first electrode plate and the second electrode plate;
And a control unit that detects an unlocked state of the lock device according to the impedance measured by the measurement unit. The detection device according to claim 1,
The detecting device, wherein the dielectric constant variable member is provided on the movable body. The detection device according to claim 1 or 2,
The first electrode plate and the second electrode plate are provided so as to be substantially orthogonal to the moving direction of the movable body,
The detection apparatus, wherein the second electrode plate is provided closer to the movable body than the first electrode plate, and a hole through which the movable body passes is formed. The detection device according to claim 1 or 2,
The detection device, wherein the first electrode plate and the second electrode plate are provided so that the moving direction of the movable body is substantially parallel. The detection device according to claim 1,
The first electrode plate and the second electrode plate are provided so as to be substantially orthogonal to the moving direction of the movable body,
The second electrode plate is provided closer to the movable body than the first electrode plate, and a hole through which the movable body passes is formed.
The dielectric constant changing member is provided on the first electrode plate, and pressed according to the entry of the movable body. In the detection device according to any one of claims 1 to 5,
A sensor for detecting vibration generated in accordance with the movement of the movable body;
The said control part makes the said measurement part measure the impedance between a said 1st electrode plate and a said 2nd electrode plate, if the said sensor detects the vibration more than predetermined value, The detection apparatus characterized by the above-mentioned. The detection device according to claim 6, wherein
The sensor is provided on an upper surface of an outer wall of the Troyoke. In the detection device according to any one of claims 1 to 7,
The detection device, wherein the first electrode plate and the second electrode plate are covered with a dielectric. A locking / unlocking detection method by a detecting device that includes a troyoke formed with a recess and detects a locking / unlocking state of a locking device locked by the entry of a movable body into the recess,
In the detection device,
A first electrode plate and a second electrode plate provided facing each other so as to form a gap into which the movable body enters in the recess,
A dielectric constant variable member that changes a dielectric constant between the first electrode plate and the second electrode plate in accordance with an approach state of the movable body into the concave portion;
Measuring the impedance between the first electrode plate and the second electrode plate;
A locking / unlocking detection method, wherein the locking / unlocking state of the locking device is detected according to the measured impedance.

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