JP5457050B2 - Electronic key system and suspicious person intrusion prevention method - Google Patents

Description

The present invention relates to an electronic key system and a suspicious person intrusion prevention method .

  In a building such as a house, an electronic key system that uses an electronic key having a wireless function and automatically locks and unlocks the door when a resident who has the electronic key approaches the door of the building has been put into practical use. For example, Patent Document 1 discloses a system in which doors are unlocked and unlocked based on authentication using an electronic key carried by a resident. According to this, when the resident carrying the electronic key approaches the door to enter the building and enters the communication area of the communication device provided near the door, the identification information transmitted from the electronic key is transmitted to the communication device. Received by. Then, the building side authenticates whether or not it is a resident based on the identification information. When it is determined that the resident is a resident, the door is automatically unlocked. Thereby, since the door can be locked and unlocked without being directly operated manually, the convenience can be improved.

JP 2003-74256 A

  By the way, in the said system, since the communication apparatus is provided in the door vicinity, it is assumed that the communication area has spread over indoors and outdoors centering on the communication apparatus. In this case, when the electronic key is left behind in the indoor communication area (for example, the entrance of a building), communication is performed between the electronic key and the communication device against the user's will. There is a risk that the door will be unlocked without your knowledge. Therefore, there is a possibility that a suspicious person or the like may enter, and there is a problem in terms of crime prevention.

  In addition, the communication area changes in size and position due to disturbances such as changes in temperature and door opening and closing, so even if an electronic key is placed outside the communication area, the electronic key will be replaced afterwards. It is possible to get inside. In that case, communication is performed afterwards between the electronic key and the communication device, and the door is unlocked.

  Furthermore, some electronic key systems have crime prevention when communication between the electronic key and the communication device is continued for a certain period of time, that is, when the electronic key is left in the communication area of the communication device for a predetermined time. Some doors are locked in consideration. However, even in such a system, when the electronic key is placed at the edge of the communication area, the electronic key is moved into and out of the communication area as the communication area changes. The Rukoto.

  Such a problem may occur not only in a system that locks and unlocks a door based on authentication using an electronic key, but also in a system that automatically opens and closes a door based on authentication using an electronic key. This is a problem that may occur in the entire system in a building that performs processing based on authentication using an electronic key.

  In addition, the above problem is not limited to an electronic key system installed in a building, but may also occur in an electronic key system installed in a vehicle or the like other than a building. For example, in a system that locks and unlocks a door of a vehicle, there is a possibility that the door may be unlocked against the user's intention when an electronic key is left in the vehicle, in which case the car navigation system equipped in the vehicle There is a possibility that an inconvenient situation such as theft of such devices will occur.

The present invention has been made in view of the above circumstances, and prevents a process such as unlocking a door by an electronic key left indoors or in a car from being performed against the user's will. The main object of the present invention is to provide an electronic key system and a suspicious person intrusion prevention method that can enhance crime prevention.

  In order to solve the above-described problem, an electronic key system according to a first aspect of the present invention includes an electronic key that transmits unique identification information, a communication unit that receives identification information from the electronic key by wireless communication, and the communication unit through the communication unit. A processing unit that executes a predetermined process based on the identification information received from the electronic key, a movement determination unit that determines movement of the electronic key, and the electronic key through the communication unit. The processing unit performs processing based on the identification information received from the control unit, and controls the processing unit not to perform processing when the movement determination unit determines that the electronic key has not moved. And a control unit.

  According to the present invention, when the processing unit performs a predetermined process based on the identification information received from the electronic key through the communication unit, while the movement determination unit determines that the electronic key has not moved, Processing by the processing unit is not performed. Therefore, when the electronic key is left in a communication area where communication with the communication unit can be performed, for example, when it is left indoors or in a car in the same area, predetermined processing such as unlocking the door is performed by the user. It can be prevented from being performed contrary to the intention. Therefore, crime prevention can be improved.

  According to a second aspect of the present invention, in the electronic key system according to the first aspect, the processing unit is a drive unit that locks / unlocks or opens / closes a door that opens / closes a building entrance / exit, and the control unit is configured to transmit the door through the communication unit. The drive unit is driven based on the identification information received from the electronic key, and the drive unit is controlled not to be driven when the movement determination unit determines that the electronic key is not moved. It is characterized by.

  According to the present invention, when the door is locked or unlocked or opened / closed by the drive unit based on the identification information received from the electronic key through the communication unit, while the electronic key is not moved by the movement determination unit. The door is not unlocked or opened or closed by the drive unit. Therefore, even when the electronic key is left indoors in the communication area of the communication unit, the door can be prevented from being unlocked or opened against the user's will. Thereby, since it is possible to avoid an inconvenient situation such as allowing a suspicious person to enter without the user's knowledge, crime prevention can be improved.

  In the electronic key system according to a third aspect of the present invention, in the first or second aspect, when the electronic key is determined not to move by the movement determination unit, the identification information is transmitted. And a key control unit that controls to stop the operation.

  According to the present invention, when the movement determination unit determines that the electronic key has not moved, the transmission of the identification information by the electronic key is stopped. Therefore, the electronic key is left in the communication area indoors or in a vehicle. Even in such a case, it is possible to prevent a predetermined process from being performed by the processing unit against the user's will. That is, the effect of the first invention can be specifically realized.

  According to a fourth aspect of the present invention, there is provided the electronic key system according to the third aspect, wherein the key control unit stops the transmission of the identification information when the movement determination unit determines that the electronic key is moving. It is characterized by releasing.

  According to the present invention, when the movement determination unit determines that the electronic key is moving, the transmission of the identification information is stopped. In other words, the transmission of the identification information can be automatically restarted by simply moving the electronic key that is in a state where the transmission of the identification information is stopped, for example, by leaving it indoors. Thereby, a user's convenience can be improved.

According to a fifth aspect of the present invention, there is provided an electronic key system according to the third aspect, wherein the electronic key includes an operation unit operated by a user, and the key control unit is configured to store the identification information based on an operation of the operation unit. According to the present invention, the transmission stop is released. When the movement determination unit determines that the electronic key is moving, the transmission of the identification information is stopped based on the operation of the operation unit by the user. Canceled. That is, when an electronic key that is in the transmission stop state of identification information is moved to some beat (for example, an electronic key that has been left in an unstable state on the pedestal falls). However, the transmission stop state can be continued until a manual operation by the user is performed. As a result, it can be expected that the processing contrary to the intention of the user is more reliably prevented.

  The electronic key system according to a sixth aspect of the present invention is the electronic key system according to any one of the third to fifth aspects, wherein the electronic key can be in a power saving state in which power consumption of the electronic key is suppressed from a normal state. When the movement determination unit determines that the electronic key has not moved, the key control unit stops transmitting the identification information by setting the electronic key to the power saving state. It is characterized by that.

  According to the present invention, when the movement determination unit determines that the electronic key has not moved, transmission of identification information by the electronic key is stopped by setting the electronic key to a power saving state. Here, in order to put the electronic key into the power saving state, the power of the key communication unit of the electronic key that transmits the identification information may be turned off, or the key control unit may be set in a power saving mode such as a sleep state. It is done. As a result, even when the electronic key is left in the communication area indoors, in a vehicle, or the like, it is possible to prevent a predetermined process from being performed against the user's will and to extend the battery of the electronic key. it can.

  An electronic key system according to a seventh aspect of the present invention is the electronic key system according to any one of the first to sixth aspects, wherein the electronic key includes vibration detection means for detecting that the electronic key vibrates, and the movement determination unit includes: The electronic key is determined based on the detection result of the vibration detecting means.

  When the user carrying the electronic key is moving, vibration based on the movement is transmitted to the electronic key. Based on this point of view, in the present invention, the vibration detection means is provided in the electronic key so that the vibration of the electronic key is detected by the detection means, and whether or not the electronic key is moving is determined based on the detection result. I am going to do that. Therefore, for example, when the electronic key is vibrating, it can be determined that the electronic key is moving, and when the electronic key is not vibrating, it can be determined that the electronic key is not moving. it can. Thereby, it is possible to specifically determine whether or not the electronic key is moving.

  Here, when the vibration of the electronic key is not detected for a predetermined time by the vibration detection means, the movement determination unit may determine that the electronic key has not moved. As a result, it can be avoided that it is determined that the electronic key is not moved when the vibration of the electronic key is not detected for a short period of time, such as when the user holding the electronic key temporarily stops. . Therefore, it can be determined with higher accuracy whether or not the electronic key is left unattended.

  An electronic key system according to an eighth aspect of the present invention is the electronic key system according to any one of the first to sixth aspects, wherein the electronic key includes an electric field strength detecting means for detecting an electric field strength of a signal periodically transmitted from the communication unit. The movement determination unit is configured to determine whether or not the electronic key is moving based on a fluctuation amount of the electric field intensity detected by the electric field intensity detection unit.

  According to the present invention, the electric field intensity of the signal periodically transmitted from the communication unit is detected by the electric field intensity detecting means, and whether or not the electronic key is moved based on the detected fluctuation amount of the electric field intensity. Determined. Here, the electric field strength of the signal corresponds to the strength of the radio wave of the signal, and has the property of decreasing in inverse proportion to the distance from the communication unit that is the signal transmission source. Therefore, for example, when the fluctuation amount of the electric field strength is larger than a predetermined value, it is determined that the electronic key is moved, or when the fluctuation amount of the electric field strength is smaller than the predetermined value, the electronic key is moved. It can be determined that there is no. Thereby, it is possible to specifically determine whether or not the electronic key is moving.

  An electronic key system according to a ninth aspect is the electronic key system according to the eighth aspect, wherein the electronic key includes a storage unit that stores the electric field intensity detected by the electric field intensity detecting unit, and the electric field detected this time by the electric field intensity detecting unit. The fluctuation amount of the electric field strength is calculated based on the strength and the past electric field strength stored in the storage unit, and it is determined whether or not the calculated fluctuation amount of the electric field strength is within a predetermined range. And a movement determining unit that determines whether or not the electronic key is moving based on a determination result by the variation determining unit.

  According to the present invention, the fluctuation amount of the electric field strength is calculated based on the electric field strength detected this time by the electric field strength detection means and the past electric field strength stored in the storage unit, and the fluctuation of the calculated electric field strength is calculated. Whether or not the amount is within a predetermined range is determined by the variation amount determination unit. And since it is determined whether the electronic key is moving based on the determination result, the effect of the 8th invention can be concretely realized.

The top view which shows the entrance periphery vicinity in 1st Embodiment. The whole block diagram which shows an electronic key system. The flowchart which shows the control processing by the building side. The flowchart which shows the control processing by the side of an electronic key. The whole block diagram which shows the electronic key system in 2nd Embodiment. 9 is a flowchart showing control processing on the electronic key side in the second embodiment.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the vicinity of the entrance, and FIG. 2 is an overall configuration diagram showing the electronic key system in the present embodiment.

  As shown in FIG. 1, a building 10 is provided with an entrance 11, a corridor 12, a living room 13 and the like as indoor spaces. A clog box 14 is installed at the entrance 11, and a key (for example, an electronic key) owned by a resident can be placed thereon. The building 10 is provided with a doorway 15 that allows the entrance 11 to communicate with the outside. Access to the building 10 is possible through the entrance 15. An entrance door 16 is provided at the entrance 15. The entrance door 16 is, for example, a rotary door, and the entrance door 15 is opened and closed by turning the entrance door 16.

  The building 10 is provided with an outdoor device 20 that manages the locking and unlocking of the entrance door 16. The outdoor side apparatus 20 is installed in the outer wall part around the entrance door 16, for example. As shown in FIG. 2, the outdoor side device 20 includes a locking / unlocking device 21 as a drive unit, a building side controller 22 as a control unit, and a building side communication unit 23 as a communication unit. The locking / unlocking device 21 is a device that locks and unlocks (locks and unlocks) the entrance door 16 by electrically locking and unlocking the lock.

  The building-side controller 22 performs locking / unlocking control of the entrance door 16 in this electronic key system, and includes a known microcomputer having a CPU and the like. The building-side controller 22 has an ID code storage unit 25 that stores ID code information as identification information.

  The building-side communication unit 23 performs wireless communication with the electronic key 30 possessed by the user. The communication area of the building-side communication unit 23 is set within a range of, for example, a radius of about 80 cm with the communication unit 23 as a center, and can communicate with the electronic key 30 in the area. In this embodiment, the communication area of the building-side communication unit 23 straddles indoors and outdoors as indicated by a dashed-dotted circular frame in FIG. 1, and a part thereof extends to the entrance 11. The building-side controller 22 is electrically connected to the building-side communication unit 23 and can communicate with the electronic key 30 via the building-side communication unit 23.

  The electronic key 30 is a key-type portable device that can be carried around by the user U. The electronic key 30 includes a key controller 31 as a key control unit and a key side communication unit 32. The key controller 31 includes a known microcomputer and has a storage function for storing an ID code as identification information. The key controller 31 stores an ID code unique to the electronic key 30 in advance.

  The key-side communication unit 32 performs wireless communication with the building-side communication unit 23. The key controller 31 is electrically connected to the key side communication unit 32 and can communicate with the building side controller 22 via the key side communication unit 32 and the building side communication unit 23.

  The building-side controller 22 transmits a request signal to the communication area (see FIG. 1) described above at a predetermined cycle via the building-side communication unit 23. Here, when the user having the electronic key 30 enters the area and the request signal is input to the key controller 31 via the key side communication unit 32, the key controller 31 uses the ID code signal as a response to the request signal. It transmits from the side communication part 32. When the building-side communication unit 23 receives this ID code signal, the ID code signal is input to the building-side controller 22.

  ID code information as identification information is stored in advance in the ID code storage unit 25 of the building-side controller 22. The ID code information stored in the ID code storage unit 25 corresponds to the ID code stored in the electronic key 30. The building-side controller 22 authenticates the ID code when the ID code signal is input from the key controller 31. Specifically, the building controller 22 determines whether or not the input ID code signal matches the ID code stored in the ID code storage unit 25. And the locking / unlocking device 21 is connected to the output side of the building-side controller 22, and the building-side controller 22 outputs a locking signal or unlocking signal to the locking / unlocking device 21 based on the result of the ID authentication, Locking / unlocking control of the front door 16 is performed.

  By the way, in the electronic key system described above, the communication area of the building-side communication unit 23 extends to the entrance 11 on the indoor side. For example, when the electronic key 30 is left on the shoebox 14 in the area. Contrary to the user's intention, communication is performed between the electronic key 30 and the building-side communication unit 23, and the entrance door 16 may be unlocked without the user's knowledge. Therefore, the above-mentioned system has a problem in terms of crime prevention. Therefore, in the present embodiment, a determination function for determining whether or not the electronic key 30 has moved is provided, and when it is determined that the electronic key 30 has not moved, the unlocking process by the locking and unlocking device 21 is performed. This is not performed, thereby preventing the unlocking process against the user's will by the electronic key 30 left indoors. The details will be described below.

  As shown in FIG. 2, the electronic key 30 of this embodiment includes a vibration sensor 35 as vibration detection means. The vibration sensor 35 is a sensor that detects that the electronic key 30 is vibrating. For example, the vibration sensor 35 is built in the electronic key 30. The vibration sensor 35 is connected to the input side of the key controller 31, and the detection result is sequentially input to the key controller 31.

  The key controller 31 outputs an ON signal or an OFF signal to a power supply unit (not shown) of the key side communication unit 32 based on the detection result from the vibration sensor 35. As a result, the key-side communication unit 32 can be switched between a power-on state and a power-off state. Here, the key-side communication unit 32 can communicate with the building-side communication unit 23 in the power-on state, but cannot communicate with the building-side communication unit 23 in the power-off state.

  Next, the locking / unlocking control process performed in this electronic key system will be described. Here, the control process executed by the building-side controller 22 of the outdoor device 20 and the control process executed by the key controller 31 of the electronic key 30 will be described.

  First, control processing executed by the building-side controller 22 of the outdoor device 20 will be described based on the flowchart shown in FIG. This process is repeatedly executed at a predetermined cycle.

  First, in step S11, a request signal is transmitted from the building-side communication unit 23 to the communication area (see FIG. 1) described above.

  In a succeeding step S12, it is determined whether or not the ID code signal transmitted from the electronic key 30 as a response to the request signal is received via the building-side communication unit 23. If the ID code signal has not been received, the process proceeds to step S15. If the ID code signal has been received, the process proceeds to step S13.

  In step S13, it is determined whether or not the ID code signal received from the electronic key 30 matches the ID code stored in the ID code storage unit 25 in advance. If the ID code signal from the electronic key 30 matches the ID code stored in advance, the process proceeds to step S14, and the unlock signal is output to the locking / unlocking device 21. Thereby, since the front door 16 is unlocked, the user can open the front door 16 and enter the building 10 through the front door 15. On the other hand, if the ID code signal from the electronic key 30 does not match the ID code stored in advance, the process proceeds to step S15 and the locking signal is output to the locking / unlocking device 21. Thereby, since the entrance door 16 is locked, intrusion to the building 10 by a suspicious person etc. can be prevented. At this time, if the locking / unlocking device 21 is already in the locked state, the locked state is continued as it is. This control process is complete | finished after the process of step S14 or step S15 is complete | finished.

  Next, control processing executed by the key controller 31 of the electronic key 30 will be described based on the flowchart shown in FIG. This process is repeatedly executed at a predetermined cycle.

  First, in step S21, it is determined based on the detection signal from the vibration sensor 35 whether or not the electronic key 30 is vibrating. That is, here, it is determined whether or not the electronic key 30 is possessed by the user and moved with the user. If the electronic key 30 is not vibrating, the process proceeds to step S28 described later. On the other hand, if the electronic key 30 is vibrating, the process proceeds to step S22.

  In step S <b> 22, a power ON signal is output to the power unit of the key side communication unit 32. As a result, the key communication unit 32 is turned on, and communication with the building communication unit 23 becomes possible. At this time, if the key side communication unit 32 is already in the power ON state, the ON state is continued as it is.

  In a succeeding step S23, timing by a timer is started.

  In step S24, it is determined whether a request signal transmitted from the building side communication unit 23 has been received. When the electronic key 30 enters the communication area of the building-side communication unit 23 and receives a request signal, the process proceeds to step S25, and an ID code signal is transmitted from the key-side communication unit 32 as a response. Then, the process proceeds to step S26. On the other hand, if the electronic key 30 is outside the communication area of the building-side communication unit 23 and has not received a request signal, the process proceeds to step S26.

  In step S26, it is determined based on the detection signal from the vibration sensor 35 whether or not the electronic key 30 is vibrating. If the electronic key 30 is oscillating, the process returns to step S23 to end the time count by the timer so far and newly start the time count by the timer. That is, as long as the electronic key 30 continues to vibrate, such as being held by the user, the time measurement by the timer does not proceed. On the other hand, if the electronic key 30 is not vibrating, the process proceeds to step S27.

  In step S27, it is determined whether the elapsed time by the timer has passed a predetermined time. Here, the predetermined time is set to a sufficient time that the electronic key 30 can be regarded as being left, and is set to 3 minutes, for example. If the elapsed time by the timer has passed the predetermined time, the process proceeds to step S28, and an OFF signal is output to the power supply unit of the key side communication unit 32. As a result, the key-side communication unit 32 is turned off and communication with the building-side communication unit 23 becomes impossible. For this reason, the key-side communication unit 32 cannot receive the request signal, and consequently cannot transmit the ID code signal as a response. That is, in this embodiment, it is determined that the electronic key 40 has not moved when a predetermined time has passed without vibration of the electronic key 30 being detected, and transmission of the ID code signal is stopped. Even if the door is left in the communication area of the building side communication unit 23, the entrance door 16 is not unlocked. On the other hand, if the elapsed time by the timer does not elapse in step S27, steps S24 to S27 are repeated until the predetermined time elapses.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  When the vibration of the electronic key 30 is not detected for a predetermined time by the vibration sensor 35, that is, when it is determined that the electronic key 30 has not moved, the ID code is set by turning off the power of the key side communication unit 32. The transmission of the signal was stopped. Thereby, when the electronic key 30 is left in the communication area of the building-side communication unit 23 in the building 10, it is possible to prevent the entrance door 16 from being unlocked against the user's will. It is possible to avoid an inconvenient situation such as allowing a suspicious person to enter without knowing. Therefore, crime prevention can be improved.

  In addition, since the transmission of the ID code signal is stopped by turning off the power of the key side communication unit 32, the effect of extending the battery of the electronic key 30 in addition to the above effect can be obtained. .

  When the vibration of the electronic key 30 is detected by the vibration sensor 35, that is, when it is determined that the electronic key 30 is moving, the power of the key-side communication unit 32 is turned on, so that the ID code signal The transmission stop state was canceled. Accordingly, when the electronic key 30 is left in the building 10 and the power of the key side communication unit 32 is in the OFF state, the power can be simply obtained by moving the electronic key 30 by the user's hand. Since it can be turned ON, transmission of the ID code signal can be automatically resumed. Therefore, user convenience can be improved.

  The electronic key 30 is provided with a vibration sensor 35 that detects that the electronic key 30 is vibrating, and based on the detection result of the vibration sensor 35, it is determined whether or not the electronic key 30 is moving. Thereby, it is possible to specifically determine whether or not the electronic key 30 is moving. There is also an advantage that the movement determination of the electronic key 30 can be realized with a simple configuration.

  Specifically, when the vibration of the electronic key 30 is not detected by the vibration sensor 35 for a predetermined time, it is determined that the electronic key 30 has not moved. Thereby, it is avoided that it is determined that the electronic key 30 has not moved because the vibration of the electronic key 30 has not been detected for a short period of time, such as when the user holding the electronic key 30 temporarily stops. be able to. Therefore, it can be determined with higher accuracy whether or not the electronic key 30 is left unattended.

[Second Embodiment]
In 1st Embodiment, it was set as the structure which determines the movement of the electronic key 30 based on the detection result of the vibration sensor 35 which detects the vibration of the electronic key 30, However, In this embodiment, the request signal transmitted from the building 10 side. The electric field strength of the electronic key can be detected by the electronic key, and the movement of the electronic key is determined based on the detected fluctuation amount of the electric field strength. Therefore, the configuration of the present embodiment will be described below with a focus on differences from the first embodiment based on FIG. FIG. 5 is a diagram showing an electrical configuration of the electronic key system. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The electronic key 40 of this embodiment includes an electric field strength sensor 41 in place of the vibration sensor 35 in the first embodiment. The electric field strength sensor 41 is a sensor that detects the electric field strength (corresponding to the strength of radio waves) of a signal received by the key side communication unit 32. Here, it is assumed that the electric field intensity of the request signal transmitted from the building side communication unit 23 is detected by the sensor 41. The electric field strength of a signal changes in accordance with the separation distance from the transmission source that transmits the signal, and specifically has a property of decreasing in inverse proportion to the separation distance from the transmission source. For this reason, the electric field strength detected by the electric field strength sensor 41 changes according to the separation distance of the electronic key 40 from the building-side communication unit 23.

  The electric field strength sensor 41 is connected to the input side of the key controller 43, and the detection result is sequentially input to the key controller 43. The key controller 43 has an electric field strength storage unit 44. When a detection result is input from the electric field strength sensor 41 to the controller 43, the key controller 43 converts the detection result (that is, the electric field strength) into the electric field strength each time. Store in the storage unit 44.

  Next, the locking / unlocking control process performed in the electronic key system in this embodiment will be described. Below, the control process performed by the key controller 43 of the electronic key 40 is demonstrated based on the flowchart shown in FIG. In addition, this process is repeatedly performed with a predetermined | prescribed period, and specifically, for example, it is performed with the substantially same period as the transmission period of the request signal from the building side communication part 23.

  In addition, the control process executed by the building-side controller 22 of the outdoor device 20 is the same as the process (see FIG. 3) in the first embodiment, and thus the description thereof is omitted here.

  First, in step S31, it is determined whether or not a request signal has been received from the building-side communication unit 23. When the request signal is received, the process proceeds to step S32, and the electric field strength E (i) of the request signal is read based on the detection result from the electric field strength sensor 41.

  In subsequent step S33, the electric field strength E (i) read in step S32 is stored in the electric field strength storage unit 44. The electric field intensity E (i) stored in the electric field intensity storage unit 44 is only the latest two times. When the latest electric field intensity E (i) is stored in the electric field intensity storage unit 44, the storage unit 44 The previous electric field intensity E (i−2) stored in is overwritten and erased.

  In step S34, it is determined whether or not the previous electric field intensity E (i-1) acquired in the previous process and the previous electric field intensity E (i-2) acquired in the previous process are stored in the electric field intensity storage unit 44. To do. If at least one of the previous electric field intensity E (i-1) and the previous electric field intensity E (i-2) is not stored in the electric field intensity storage unit 44, the process proceeds to step S39, and the key An ID code signal is transmitted from the side communication unit 32. Then, this process is terminated. On the other hand, when both the previous electric field strength E (i-1) and the previous electric field strength E (i-2) are stored in the electric field strength storage unit 44, the process proceeds to step S35.

  In steps S35 to S38, a determination process is performed to determine whether or not the fluctuation amount of the electric field strength is within a predetermined range. In the present embodiment, it is determined by this determination process whether or not the electronic key 40 is moving. First, in step S35, the previous electric field strength E (i-1) and the previous electric field strength E (i-2) are read from the electric field strength storage unit 44.

  In subsequent step S36, the current electric field intensity E (i) and the previous electric field intensity E (i-1) are determined based on the electric field intensity E (i-1) and E (i-2) read in step S35. And the difference between the current electric field intensity E (i) and the previous electric field intensity E (i-2). That is, here, the fluctuation amount of the electric field strength with respect to the previous electric field strength E (i-1) and the fluctuation amount of the electric field strength with respect to the previous electric field strength E (i-2) are calculated.

  In steps S37 and S38, based on the calculation result in step S36, the fluctuation amount of the electric field strength with respect to the previous electric field strength E (i-1) and the fluctuation amount of the electric field strength with respect to the previous electric field strength E (i-2) Are in a range larger than −α and smaller than + α (α is a constant). Here, α is a predetermined value set arbitrarily. In general, the electric field strength has a property of changing due to a disturbance such as a change in temperature or opening / closing of a door. Therefore, in order to avoid erroneous determination that the electronic key 40 is moving due to a change in the electric field strength based on such disturbance, α is set as an error tolerance value, and the fluctuation amount of the electric field strength is within the above range. If there is, it is determined that the electronic key 40 has not moved.

  In Steps S37 and S38, when the variation amount of each electric field intensity is both larger than −α and smaller than + α, this processing is terminated as it is. That is, in this case, it is determined that the electronic key 40 has not moved, and the ID code signal is not transmitted from the building-side communication unit 23. Therefore, even if the electronic key 40 is left in the communication area of the building side communication unit 23, the entrance door 16 is not unlocked. On the other hand, if any of the fluctuation amounts of the electric field intensity is −α or less or + α or more, it is determined that the electronic key 40 has moved, and the process proceeds to step S39.

  In step S39, an ID code signal is transmitted from the key side communication unit 32. Thereby, when an ID code signal is input to the building-side controller 22 via the building-side communication unit 23, the entrance door 16 is unlocked by the locking / unlocking device 21. Thereafter, this process is terminated.

  On the other hand, if the request signal is not received from the building-side communication unit 23 in step S31 described above, the process proceeds to step S40, and all the electric field strengths E (i) stored in the electric field strength storage unit 44 are deleted. . Therefore, for example, when the electronic key 40 goes out of the communication area of the building-side communication unit 23 in a state where the electric field strength E (i) is stored in the electric field strength storage unit 44, the electronic key 40 is stored in the storage unit 44. The existing electric field strength E (i) is erased. Thereafter, this process is terminated.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  When the electronic key 40 (key controller 43) determines that the fluctuation amount of the electric field strength of the request signal is within a predetermined range, that is, when it is determined that the electronic key 40 has not moved, the ID code signal The transmission was stopped. Thereby, even when the electronic key 40 is left in the communication area of the building-side communication unit 23 in the building 10, it is possible to prevent the entrance door 16 from being unlocked against the user's intention. It is possible to avoid an inconvenient situation such as allowing a suspicious person to enter without knowing. Therefore, crime prevention can be improved.

  When the electronic key 40 (key controller 43) determines that the fluctuation amount of the electric field strength of the request signal is not within the predetermined range, that is, when it is determined that the electronic key 40 is moving, the ID code signal The transmission stop was canceled. Accordingly, when the electronic key 40 is left in the building 10 and is in the transmission stop state of the ID code signal, the ID code signal can be transmitted simply by moving the electronic key 40 by the user. Can be resumed automatically. Therefore, user convenience can be improved.

  The electronic key 40 is provided with an electric field strength sensor 41 for detecting the electric field strength of the request signal transmitted from the building-side communication unit 23, and the electronic key 40 moves based on the fluctuation amount of the electric field strength detected by the sensor 41. Judgment whether or not. Specifically, the fluctuation amount of the electric field strength is calculated based on the electric field strength detected this time and the past electric field strength stored in the electric field strength storage unit 44, and the calculated fluctuation amount falls within a predetermined range. The movement of the electronic key 40 is determined by determining whether or not there is. Thereby, it is possible to specifically determine whether or not the electronic key 40 is moving.

[Other Embodiments]
The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  (1) In the first embodiment, when the vibration of the electronic key 30 is not detected for a predetermined time by the vibration sensor 35, the key side communication unit 32 is turned off. When the vibration of the electronic key 30 is not detected by the vibration sensor 35, the key-side communication unit 32 may be immediately turned off.

  (2) In the first embodiment, when the vibration of the electronic key 30 is detected by the vibration sensor 35, it is determined in the second embodiment that the fluctuation amount of the electric field strength is not within the predetermined range. In this case, the transmission stop state of the ID code signal is automatically canceled, but this is changed, for example, an operation unit operated by the user is provided on the electronic key, and the ID is determined based on the operation of the operation unit. The transmission stop state of the code signal may be canceled. In this case, the electronic key that is in a state where transmission of the ID code signal is stopped is left in the building 10 or the like (for example, the electronic key that has been left in an unstable state on the table is dropped). Even in such a case, the transmission stop state can be continued until a manual operation by the user is performed. Therefore, it is expected to more surely prevent the entrance door 16 from being unlocked against the user's will. it can.

  (3) In the second embodiment, the electric field strength sensor 41 is provided with the electronic key 40. However, by changing this, the electric field strength sensor may be provided with, for example, the outdoor device 20 on the building 10 side. Good. In this case, a signal is periodically transmitted from the electronic key, and the electric field strength sensor on the building 10 side detects the electric field strength of the signal. The electric field strength detected by the electric field strength sensor is input to the building-side controller 22 of the outdoor device 20, and the building-side controller 22 determines whether or not the electronic key is moving based on the fluctuation of the electric field strength. Like that. This can also determine the movement of the electronic key.

  (4) In the second embodiment, the electric field intensity E (i) of this time, the electric field intensity E (i-1) of the previous time, and the electric field intensity E (i-2) of the previous time are three consecutive electric field strengths. The variation amount of the electric field strength is calculated based on this, but this may be changed, and the variation amount of the electric field strength may be calculated based on two consecutive electric field strengths, or four or more consecutive times The fluctuation amount of the electric field strength may be calculated based on the electric field strength.

  (5) In the second embodiment, the threshold for determining whether or not the fluctuation amount of the electric field intensity calculated by the key controller 43 is within a predetermined range is set to a constant ± α. This α may be a variable. For example, the value of α may be varied based on the current electric field strength detected by the electric field strength sensor 41. Specifically, the value of α should be increased when the current electric field strength is large, and the value of α should be decreased when the current electric field strength is small. Then, since the predetermined range can be determined according to the magnitude of the electric field strength, it can be expected to improve the accuracy of the movement determination of the electronic key 40.

  (6) In the above embodiment, the electronic key system of the present invention is applied to the locking / unlocking system that locks / unlocks the door 16 based on the ID code signals from the electronic keys 30, 40. The electronic key system of the present invention may be applied to a system that performs other processing based on a code signal. For example, it is conceivable to apply the present invention to a door opening / closing system in which a drive unit for opening and closing a door is driven based on an ID code signal from an electronic key, thereby opening and closing the door.

  Moreover, although the said embodiment demonstrated the case where the electronic key system of this invention was provided in the building 10, you may provide this system in things other than buildings, such as a vehicle. For example, if the present system is applied to unlocking and unlocking a vehicle door, it is possible to prevent the vehicle door from being unlocked against the user's will even if the electronic key is left behind in the vehicle. Further, when the vehicle is parked near the building 10, the vehicle door may be unlocked by the electronic key left in the building 10, but in that case also, the unlocking of the vehicle door should be prevented. Can do. Therefore, it is possible to avoid an inconvenient situation such as a car navigation system or audio equipment installed in the vehicle being stolen by someone without the knowledge of the user.

  (7) In the above embodiment, the key for locking and unlocking the entrance door 16 is used as the electronic keys 30 and 40, but instead of this, other electronic keys such as an electronic key that can be shared between the building 10 and the vehicle are used. Also good.

  (8) In the embodiment described above, the outdoor device 20 is integrally provided with the locking / unlocking device 21, the building-side controller 22, and the building-side communication unit 23. It is good also as a structure which arrange | positions ~ 23 separately.

  DESCRIPTION OF SYMBOLS 10 ... Building, 15 ... Entrance door as an entrance, 16 ... Entrance door as a door, 20 ... Outdoor side device, 21 ... Locking / unlocking device as a processing part and a drive part, 22 ... Controller as a control part, 23 ... Communication Building side communication unit as a unit, 30... Electronic key, 31... Movement determination unit, key controller as key control unit and variation amount determination unit, 35. An electric field intensity sensor as intensity detecting means, 44... An electric field intensity storage section as a storage section.

Claims (6)

A communication unit that is provided near the entrance of the building and transmits a request signal wirelessly at a predetermined cycle;
An electronic key for transmitting unique identification information as a response to the request signal received from the communication unit;
Based on the identification information received from the electronic key through the communication unit, a drive unit that locks or unlocks or opens and closes the door that opens and closes the doorway ,
In an electronic key system having
A movement determination unit for determining movement of the electronic key;
The drive unit is driven based on the identification information received from the electronic key through the communication unit, while the drive unit is not driven when the identification information is not received from the electronic key through the communication unit. A control unit to control;
With
The transmission range of the request signal by the communication unit is set to straddle indoors and outdoors across the entrance / exit,
When the movement determination unit determines that the electronic key has not moved, the electronic key is connected to the communication unit so that the request signal is not received from the communication unit. An electronic key system comprising a key control unit for controlling communication to be disabled. The key control unit, wherein, when said electronic key by the movement determination unit is determined to be moving, according to claim 1, characterized in that to release the incommunicable state with the communication unit Electronic key system. The electronic key includes an operation unit operated by a user,
The electronic key system according to claim 1 , wherein the key control unit releases a state incapable of communicating with the communication unit based on an operation of the operation unit. The electronic key can be in a power saving state in which power consumption of the electronic key is suppressed from a normal state,
When the movement determination unit determines that the electronic key has not moved, the key control unit sets the electronic key to the power saving state to disable communication with the communication unit. electronic key system according to any one of claims 1 to 3, characterized in that. The electronic key includes vibration detection means for detecting that the electronic key is vibrating,
The said movement determination part determines whether the said electronic key is moving based on the detection result of the said vibration detection means, The Claim 1 thru | or 4 characterized by the above-mentioned. Electronic key system. A request signal transmission step of wirelessly transmitting a request signal at a predetermined cycle from a communication unit provided near the entrance of the building;
An identification signal transmission step in which the electronic key transmits unique identification information as a response to the request signal received from the communication unit;
A control unit that controls a drive unit that locks / unlocks or opens / closes the door that opens / closes the doorway drives the drive unit based on identification information received from the electronic key through the communication unit, A drive unit control step for controlling not to drive the drive when no identification information is received from the key;
An electronic key movement determination step for determining whether or not the electronic key is moved by a movement determination unit included in the electronic key;
When the electronic key movement determination step determines that the electronic key has not moved, communication with the communication unit is disabled so that the request signal is not received from the communication unit. An electronic key communication control step for controlling the key control unit to be in a state;
A suspicious person intrusion prevention method comprising:

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