JP2011208388A - Electric lock system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily lock/unlock a lock without performing a specific locking/unlocking operation while preventing illegal unlocking.SOLUTION: A reader 20 outputs a signal for locking/unlocking the lock when comparing an AGC level of a mobile device specification signal in second receiving with an AGC level in first receiving to determine a level increase within a predetermined range upon receiving, at receiving timing of a receiving gate based on receiving gate specification information, a mobile device specification signal in which equipment ID information of the mobile device specification signal including equipment ID information received from a mobile device 10 and specifying itself, transmission information added to an inquiry signal transmitted from the reader, and receiving gate specifying information indicating a receiving gate of the reader 20 selected at random, is coincident with the equipment ID information of the registered mobile device and also coincident with the transmitted information added to the inquiry signal.

Description

  The present invention includes a portable device that transmits a portable device identification signal for authentication that identifies a user, and a reader that receives the portable device identification signal transmitted from the portable device, and the portable device performs predetermined communication of the reader. The present invention relates to an electric lock system that locks and unlocks a lock by using an induced magnetic field that is activated when it comes close to an area.

  Conventionally, for the purpose of improving security and operability, a door locking / unlocking device by electronic control using an ID code for locking / unlocking has been proposed. This type of locking / unlocking device consists of a portable remote control key owned by the user and a locking / unlocking mechanism that receives the ID transmitted by the remote control key, and locks / unlocks the lock based on the result of ID verification by wireless communication. Do. In addition, about such a locking / unlocking apparatus, what was described in the following patent document 1, for example is well-known.

  FIG. 6 shows a schematic configuration of the locking / unlocking device disclosed in Patent Document 1. As shown in FIG. 6, a transmitter / receiver provided with a transmitting antenna and a receiving antenna, and a touch switch 101 provided with the transmitter / receiver and a cylinder lock and capable of being unlocked and unlocked by an operation of the person who wants to lock / unlock are provided. The outer lock 102 is disposed on the outer surface of the door 103. Further, the inner surface of the door 103 includes a transmitter / receiver provided with a transmitting antenna and a receiving antenna, and a thumb turn device provided with an electric drive part of a locking / unlocking mechanism, and an inner locking part 105 provided with a touch switch 104. Are arranged. In this locking / unlocking device, the controller 107 shifts to a locking / unlocking preparation mode in accordance with reception of a response code signal from the portable device 106, and the touch switch 101 or 104 is operated in this preparation mode. Thus, the locking or unlocking is executed.

JP 2003-343129 A

  Thus, in the conventional locking / unlocking device disclosed in Patent Document 1, when the user presses the touch key disposed on the door in the state of being close to the door at the time of locking / unlocking, the user willing to lock / unlock the device. Recognizing that there was a lock and unlocking.

  However, in the above-described conventional locking and unlocking device, it is indispensable to press the touch key in order to confirm the user's intention to lock and unlock, and it is difficult to press the touch key when both hands of the user are blocked, If you try to press the touch key forcibly, especially if you have a heavy load, there is a risk of accidents such as a fall or falling of the load. In addition, a user who cannot use his / her hand freely, such as a handicapped person whose upper limbs are inconvenient, cannot press and unlock the touch keys. In addition, because the location of the touch key is often set to the height that matches the standard height of an adult, there is also a problem that the user cannot perform the unlocking / unlocking operation smoothly when the user is a short stature or an elderly person. there were.

  Moreover, in this kind of locking / unlocking apparatus, since the touch key is arrange | positioned at the door, a touch key may be damaged by mischief or a function fall may be caused. In addition, touch keys are provided on the surface of the door so that the user can easily perform the pressing operation.

  By the way, as another form of the locking / unlocking device, there is also known a method of unlocking the lock depending on the reception level when the portable device approaches the reader. However, in this method, the reader does not have an approach detection function. When the portable device is left in the vicinity of the reader, the lock is always unlocked, which causes a security problem.

  Furthermore, in recent years, copying of spatial transmission signals has been facilitated by the advancement of noise canceller technology that invalidates noise by superimposing a signal having an opposite phase to certain noise. For this reason, there is a possibility that a signal transmitted and received between the reader and the portable device may be intercepted and illegally unlocked using the signal, and further security improvement is required.

  Therefore, the present invention has been made in view of the above problems, and can be easily locked and unlocked by a user without performing a specific locking and unlocking operation, and a signal between a reader and a portable device. An object of the present invention is to provide a secure electric lock system that can prevent unauthorized unlocking by interception.

In order to achieve the above object, an electric lock system according to claim 1 is a portable device that transmits a portable device identification signal for authentication that identifies a user;
A reference number for requesting the portable device specific signal transmitted from the portable device is periodically transmitted, and a portable device specific signal corresponding to the inquiry signal is received at an AGC level corresponding to a communication distance with the portable device. A reader having a plurality of reception gates,
In the electric lock system that performs locking and unlocking using an induced magnetic field that is activated when the portable device approaches within a predetermined communication area of the reader,
When the portable device receives the inquiry signal from the reader at a predetermined reception timing close to the reader communication area, the portable device receives the device ID information for identifying itself and the randomly selected reader. Transmitting the portable device specific signal including reception gate designation information indicating a gate;
The reader receives the portable device identification signal whose device ID information of the portable device identification signal received from the portable device matches the device ID information of the registered portable device at the reception timing of the selected reception gate. When the AGC level of the portable device specific signal at the time of the second reception is compared with the AGC level at the time of the first reception and it is determined that the level increases within a predetermined range, the lock is unlocked. A signal for locking is output.

An electric lock system according to claim 2 is a portable device that transmits a portable device identification signal for authentication that identifies a user;
A reference number for requesting the portable device specific signal transmitted from the portable device is periodically transmitted, and a portable device specific signal corresponding to the inquiry signal is received at an AGC level corresponding to a communication distance with the portable device. A reader having a plurality of reception gates,
In the electric lock system that performs locking and unlocking using an induced magnetic field that is activated when the portable device approaches within a predetermined communication area of the reader,
The portable device is close to the communication area of the reader and receives the inquiry signal to which predetermined transmission information is added from the reader at a predetermined reception timing, and device ID information for identifying itself, Transmitting the portable device specific signal including the transmission information added to the inquiry signal and the reception gate designation information indicating the reception gate of the reader selected at random;
The reader includes the portable device identification signal in which the device ID information of the portable device identification signal received from the portable device matches the device ID information of the registered portable device and matches the transmission information added to the inquiry signal. Is received at the reception timing of the selected reception gate, the AGC level of the portable device specific signal at the second reception is compared with the AGC level at the first reception and within a predetermined range When it is determined that the level has increased, a signal for locking and unlocking the lock is output.

The electric lock system according to claim 3 is the electric lock system according to claim 1 or 2, wherein the reader includes storage means for storing the portable device identification signal and the information of the AGC level.
When the portable device identification signal received from the portable device has been registered and received for the first time, the received portable device identification signal and AGC level information are stored in the storage means,
When the portable device identification signal received from the portable device has been registered and the increase in the AGC level of the portable device identification signal at the second reception is within the predetermined range, information on the portable device identification signal and the AGC level is obtained. , Deleting from the storage means after the output of the signal for locking and unlocking the lock,
When the portable device identification signal received from the portable device has been registered and the increase in the AGC level of the portable device identification signal at the second reception is not within the predetermined range, information on the portable device identification signal and the AGC level From the storage means,
When the portable device identification signal received from the portable device is not registered, the portable device identification signal and AGC level information are discarded.

  According to the electric lock system of the present invention, when the lock is unlocked, the lock can be locked / unlocked by simply carrying the portable device and approaching the lock without performing any special locking / unlocking operation. Convenience can be improved. In addition, the location is not limited as long as it can communicate with a portable device using an induction magnetic field, so it can be hidden and installed to prevent damage and functional degradation due to mischief, improving security. Can be made. Further, the reader matches the device ID information of the portable device, the transmission information transmitted from the reader, and the reception timing of the reception reader selected at random, and the second reception level is higher than the first reception level. Since the locking / unlocking operation can be performed only when the level is increased beyond the level, it is possible to improve the security by making it difficult to illegally unlock the signal by copying the spatial transmission signal.

It is a block diagram showing a schematic structure of an electric lock system concerning the present invention. It is a timing chart for demonstrating the reception timing with respect to the collation signal from a reader | lead in the electric lock system which concerns on this invention. It is explanatory drawing which shows the relationship between the reception level and communication distance between a portable machine and a reader in the electric lock system concerning the present invention. It is a flowchart figure for demonstrating the processing operation of the electric lock system which concerns on this invention. It is a timing chart figure for demonstrating the operation timing of the electric lock system which concerns on this invention. It is a fragmentary perspective view which shows schematic structure of the conventional electric lock system disclosed by patent document 1. FIG.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited by this embodiment, and all other forms, examples, operation techniques, etc. that can be implemented by those skilled in the art based on this form are included in the scope of the present invention. .

[Device configuration of electric lock system]
First, the configuration of the electric lock system of this example will be described in detail with reference to FIG. As shown in FIG. 1, the electric lock system 1 is schematically configured to include a portable device 10 and a reader 20, and uses an induced magnetic field that is activated when the portable device 10 comes close to a predetermined communication area of the reader 20. Then, various signals are transmitted / received between the portable device 10 and the reader 20 to perform lock / unlock control.

  In addition, below, although the case where the electric lock system 1 of this example is employ | adopted as the entrance door of a general house is demonstrated as an example, it is not limited to this. For example, it can be used in various places such as a nursing facility dedicated to the elderly and the disabled, an exclusive port for carrying luggage in an office building, and the like.

<Portable machine>
The portable device 10 transmits / receives various signals necessary for locking / unlocking to / from the reader 20 by using an induced magnetic field that is activated when the resident is carried within a predetermined distance within the communication area of the reader 20. Yes, as shown in FIG. 1, the mobile device side receiving unit 11, the mobile device side control unit 12, the mobile device side transmitting unit 13, and the power supply unit 14 are configured.

  The portable device side receiving unit 11 includes a receiving antenna 11a and a receiving circuit 11b. The receiving antenna 11a takes in an inquiry signal S to which transmission information to be described later is added by an induced magnetic field activated when the portable device 10 comes close to the communication area of the reader 20. When the receiving circuit 11b takes in from the receiving antenna 11a at the receiving timing of the receiving gate that is randomly selected for each inquiry signal S, the receiving circuit 11b converts the received inquiry signal S into a predetermined voltage level, and then uses the portable device as inquiry reception information. To the side control unit 12.

  Here, FIG. 2 shows the relationship between the transmission timing, the reception timing, and the reception gate in the electric lock system 1 of this example. As shown in FIG. 2, the basic timing T depends on the transmission timing of the inquiry signal S transmitted from the reader 20 and the reception timing at which the portable device 10 returns a portable device specifying signal to the reader 20 as a response to the inquiry signal S. The reception timing is the time from opening a reception gate of a reception circuit 21b (to be described later) of the reader 20 to closing the inquiry signal S (S1, S2,...) Transmitted every basic timing T, Corresponding to the reception timing of the reception circuit 21b, each basic timing T is divided into a plurality of (in the example of FIG. 2, seven receptions 1 to 7). Thereby, the transmission collision from the plurality of portable devices 10 to the reader 20 with respect to the inquiry signal S is prevented.

  The portable device side control unit 12 is constituted by a microcomputer such as a CPU, ROM, RAM, and the like, and includes a reception gate selection unit 12a. The portable device side control unit 12 determines whether or not the inquiry reception information from the portable device side reception unit 11 is the inquiry reception information output from the corresponding reader 20, and determines the validity. And the portable device side control part 12 specifies itself as a response signal with respect to this inquiry signal only when it is authenticated that it is legitimate inquiry reception information (that is, inquiry reception information transmitted from the corresponding reader 20). A signal including device ID information, transmission information included in the inquiry signal, and reception gate designation information described later in which the reception gate of the reader 20 is randomly selected is output to the portable device side transmission unit 13 as a portable device identification signal. ing.

  The reception gate designation information is information randomly selected by the reception gate selection unit 12a that selects which reception gate of the reader receives the portable device identification signal to be transmitted. As a method of specifying the reception gate by the reception gate selection means 12a, for example, numbers corresponding to the reception gates of the portable device 20 are tabulated, and reception is performed by selecting the numbers in the table based on the random numbers generated by the random number generation means. A gate is selected at random. And the portable device side control part 12 outputs to the portable device side transmission part 13 as a portable device specific signal which added the reception gate designation | designated information which shows the reception gate designated by the reception gate selection means 12a, apparatus ID information, and transmission information. is doing.

  The portable device side transmission unit 13 includes a transmission antenna 13a and a transmission circuit 13b. The transmission circuit 13b directly drives the current flowing through the transmission antenna 13a by the portable device identification signal from the portable device side control unit 12, and transmits the portable device identification signal from the transmission antenna 13a.

  The power supply unit 14 is provided with, for example, a button battery, a dry battery, and the like so as to be detachable and replaceable, and supplies necessary driving power to each unit. Moreover, the power supply unit 14 can be configured as a self-excited power generation device that performs self-excited power generation by an induction magnetic field that is activated with the reader 20 in addition to a configuration in which a battery is mounted and power is supplied.

<Reader>
The reader 20 is provided, for example, inside the door or in a wall near the door so as to be able to communicate with the portable device 10, and has a predetermined communication area for transmitting and receiving various signals related to locking and unlocking with the portable device 10. Various signals necessary for locking and unlocking are transmitted to and received from the portable device 10 using an induced magnetic field that is activated when the device 10 approaches the communication area by a predetermined distance. As shown in FIG. 1, the reader 20 includes a reader-side receiving unit 21, a reader-side control unit 22, a reader-side transmitting unit 23, a communication unit 24, and a power supply unit 25.

  The reader-side receiving unit 21 includes a receiving antenna 21a, a receiving circuit 21b, and an AGC (Automatic Gain Control) circuit 21c. The receiving antenna 21a captures a portable device specific signal transmitted from the portable device 10 using an induced magnetic field that is activated when the portable device 10 comes close to the communication area by a predetermined distance. The receiving circuit 21b receives the portable device specific signal fetched from the receiving antenna 21b at a reception timing described later from the reader-side control unit 22, converts the received portable device specific signal into a predetermined voltage level, and demodulates it. Thereafter, the information is output to the reader-side control unit 22 as portable device specific reception information (including device ID information, transmission information, and reception gate designation information). The AGC circuit 21c automatically variably controls the gain so that the gain (sensitivity) of the receiving circuit 21b becomes an appropriate value according to the intensity of the induced electromagnetic wave received by the receiving circuit 21b via the receiving antenna 21a. Yes. Then, the AGC level of the AGC circuit 21c based on the received portable device identification signal is output to the reader-side control unit 22 as AGC level information.

  Here, in the electric lock system 1 of this example, communication is performed between the portable device 10 and the reader 20 using an induced magnetic field. For example, as shown in FIG. The reception level is -41.9 dB when the communication distance is 100 cm, and the reception level is -46.7 dB when the communication distance between the portable device 10 and the reader 20 is -46.7 dB. The relationship between the communication distance and the reception level with 20 is a physical constant, and the reception level is inversely proportional to the cube of the communication distance. And according to the system of this example, the approach speed of the portable device 10 with respect to the reader 20 can be detected by looking at the reception level change for each portable device specific signal, and the distance of the portable device 10 with respect to the reader 20 can be measured from the reception level. .

  The reader-side control unit 22 is configured by a microcomputer such as a CPU, a ROM, or a RAM, for example. As shown in FIG. 1, the reader-side control unit 22 includes a storage unit 22a, an information determination unit 22b, a reception frequency determination unit 22c, and an AGC level determination unit 22d. The reader-side control unit 22 receives a portable device identification signal from the portable device 10 that accompanies the generation of a periodic inquiry signal S at each basic timing T as shown in FIGS. 2 and 5 and the transmission of the inquiry signal S. Reception timing (time from opening the reception gate to closing within the basic timing T for receiving the portable device specific signal from the portable device 10), and adding it to the reference number transmitted to the portable device 10 Processing for adding predetermined transmission information (arbitrary information that varies for each transmission) to the inquiry signal, control for enabling the output of the reception circuit 21b for each reception gate at the reception timing, and identification of the portable device from the reader-side reception unit 21 A determination process related to reception information and a determination process related to AGC level information from the reader-side receiving unit 21 are performed, and various controls related to locking and unlocking are performed according to these determination results.

  The storage means 22a is composed of, for example, a magnetic or optical storage medium or a semiconductor memory such as ROM, RAM, and the device ID information added to the portable device specific reception information based on the portable device specific signal acquired from the portable device 10 is stored. Authentication device ID information for determining whether or not the information is registered (that is, device ID information of a registered portable device), transmission information to be transmitted to the portable device 10 (for example, selected by a reader or a predetermined condition) Bit data), the number of receptions of the portable device specific reception information from the registered portable device 10, the AGC level information of the portable device specific signal received last time, the AGC level information and the previous AGC level information of the currently received portable device specific signal Various data related to drive control of each part, such as AGC level determination data for determining whether or not the level has increased within a predetermined range. Are 憶.

  The information discriminating means 22b discriminates whether or not the transmission information in the portable device specific reception information from the reader-side receiving unit 21 matches the transmission information transmitted from the reader 20, and the reception gate specified in the reception gate designation information It is determined whether or not the portable device identification signal has been received, and the device ID information in the portable device specific reception information from the reader-side receiving unit 21 and the storage means 22a are stored only when the transmission information and the reception gate match. The authentication device ID information is compared. When it is determined that the portable device specific reception information from the reader-side receiving unit 21 matches the information from the portable device 10 registered in the storage unit 22a, the normal reception information indicating that the normal portable device specific information has been input. Is output to the reception number discrimination means 22c.

  The information discriminating unit 22b determines that the transmission information in the mobile device specific reception information does not match the reception gate specified in the reception gate designation information, or the mobile device specific reception information from the reader-side receiving unit 21 stores the storage unit 22a. When it is determined that the information is not transmitted from the mobile device 10 registered in the mobile device 10, the mobile device specific reception information and the AGC level information at that time are discarded.

  When the normal reception information is input from the information determination unit 22b, the reception frequency determination unit 22c determines whether or not the portable device specific reception information is received for the first time. Then, when the reception number determination means 22c determines that the reception of the portable device specific reception information is the first time, the portable device specific reception information (portable device specification signal) and the AGC level information captured at that time are stored in the storage means 22a. I remember it. In addition, when the received mobile device specific reception information is the second time, the reception frequency determination means 22 outputs an AGC level determination signal for determining the AGC level of the mobile device specific signal to the AGC level determination means 22d. ing.

  When the AGC level determination signal is input from the reception frequency determination means 22c, the AGC level determination means 22d compares the AGC level information of the currently received portable device specific reception information with the previous AGC level information stored in the storage means 22a. It is determined whether or not the level increase is within a predetermined range of the AGC level determination data stored in the storage means 22a. When it is determined that the increase in the received AGC level information is within the predetermined range, a drive signal for driving the electric lock unit (not shown) is output to the communication unit 24. In addition, the AGC level discriminating means 22d, after the AGC level discriminating process, adds the transmission information generated by the reader side control unit 22 to the inquiry signal for requesting the portable device 10 to transmit the portable device specific signal. The data is output to the transmission unit 23.

  The AGC discriminating unit 22d does not receive the received portable device specific reception information for the first time, but compares the AGC level information at that time with the previous AGC level information stored in the storage unit 22a, thereby determining the current AGC level. When it is determined that the increase in information is not within the predetermined range, the portable device specific reception information (portable device specific signal) and AGC level information at that time are deleted from the storage means 22a.

  The reader-side transmission unit 23 includes a transmission antenna 23a and a transmission circuit 23b. The transmission circuit 23b periodically transmits an inquiry signal (added with transmission information) from the AGC level determination unit 22b from the transmission antenna 23a at each basic timing T based on the transmission timing information stored in the storage unit 22a. .

  The communication unit 24 includes, for example, a communication connector for connecting a communication cable or the like, is connected to an electric lock unit (not shown) so as to be communicable, and outputs a drive signal output from the AGC level determination unit 22d. . The electric lock unit energizes the electric lock by a drive signal from the AGC level discriminating means 22d and unlocks (or locks) the electric lock.

  The power supply unit 25 is supplied with power using a commercial power supply (AC 100 V) as an external power supply, and supplies drive power to each unit. In addition, the power supply part 25 can also be comprised with the battery unit in a door provided in the predetermined location of a door so that attachment or detachment is possible.

[Processing operation of electric lock system]
Next, the processing operation of the electric lock system 1 described above will be described with reference to FIGS. Here, when the transmission information is 8-bit data unique to the reader, the reception gate is 7 gates as shown in FIG. 2, and the electric lock system 1 of this example is arranged at the entrance door of a general house, the resident returns home. A case where the entrance door is unlocked using the portable device 10 will be described as an example.

  As shown in FIG. 5, as “reader transmission”, the reader 20 periodically transmits an inquiry signal S (S 1, S 2,...) At every basic timing T. When the resident is not close to the communication area of the reader 20, the reader 20 does not receive the portable device identification signal from the portable device 10 ("reader reception", "R1" state in FIG. 5).

  From this state, the processing procedure of FIG. 4 will be described. First, when a resident carrying the portable device 10 comes close to the communication area of the reader 20 (ST1), an induced magnetic field is generated between the portable device 10 and the reader 20. An inquiry signal S to which transmission information is added is transmitted from the reader 20 to the portable device 10 using this induced magnetic field (ST2). When the portable device 10 receives the inquiry signal S from the reader 20 at the selected reception timing, the portable device 10 determines the legitimacy of the inquiry signal S (ST3). When the portable device 10 authenticates with the inquiry signal S transmitted from the corresponding reader 20 (ST3-Yes), the reception device of the reader 20 is randomly selected (ST4), and the portable device 10 is returned as a response to the inquiry signal S. Is transmitted to the reader 20 (ST5). The portable device specifying signal includes the device ID information specifying the ID, the transmission information included in the inquiry signal, and the reception gate designation information indicating the selected reception gate.

  When the reader 20 receives the portable device identification signal transmitted from the portable device 10 at a predetermined reception timing (for example, “reader reception” and “R2” in FIG. 5) (ST6), the received portable device identification signal is received. It is determined whether or not the transmission information of the portable device specific reception information in the signal matches the transmission information transmitted from the reader 20 and whether or not it matches the reception gate specified by the reception gate designation information (ST7).

At this time, when the transmission information of the mobile device specific reception information is the transmission information transmitted from the reader 20 and the mobile device specific signal is received at the reception gate specified by the reception gate specification information (ST7-Yes), Then, it is determined whether or not the device ID information of the received portable device identification signal matches the device ID information of the portable device 10 registered in the storage means 22a (ST8).
On the other hand, when either one of the transmission information of the portable device specific reception information and the reception gate specified by the reception gate designation information does not match (ST7-No), the portable device specific reception information (portable device) received at that time Specific signal) and AGC level information are discarded (ST9).

If it is determined in ST8 that the device ID information of the received portable device specific signal does not match the device ID of the registered portable device 10 (ST8-No), then the received portable device specific reception information (mobile device specific signal). And AGC level information is discarded (ST9).
On the other hand, if the received portable device identification signal matches the device ID information of the portable device 10 registered in the storage means 22a (ST8-Yes), whether or not the received portable device identification signal is the first reception. Is determined (ST10).

If it is determined that the received portable device identification signal is the first reception (ST10-Yes), the portable device identification reception information and the AGC level information based on the received portable device identification signal are stored in the storage unit 22a (ST11). ), The process returns to ST6.
On the other hand, if it is determined that the received portable device identification signal is not the first reception (second reception) (ST10-No), the AGC level information of the portable device identification signal at that time and the portable device identification signal received last time The AGC level information is compared to determine whether the level increase (eg, ΔV in FIG. 5) is within a predetermined range (ST12).

  If it is determined that the level increase is within the predetermined range (ST12-Yes), a drive signal for unlocking the electric lock is output to the electric lock unit via the communication unit 24 (ST13). Subsequently, the mobile device specific reception information (mobile device specific signal) and the AGC level information at that time are deleted from the storage means 22a (ST14). Thereafter, the inquiry signal S to which the transmission information is added is transmitted at every basic timing T, and the process waits for reception of the portable device specifying signal from the portable device 10.

  On the other hand, when it is determined that the level increase is not within the predetermined range (ST12-No), the portable device specific reception information (portable device specific signal) and the AGC level information at that time are deleted from the storage means 22a (ST14). ). Thereafter, the inquiry signal S to which the transmission information is added is transmitted at every basic timing T, and the process waits for reception of the portable device specifying signal from the portable device 10.

  As described above, the electric lock system 1 of the present example uses the induced magnetic field that is activated when the portable device 10 owned by the user comes close to the communication area of the reader 20. When close to the communication area, the portable device 10 periodically transmits an inquiry signal S to which transmission information is added from the reader 20. The portable device 10 receives the inquiry signal S at a predetermined reception timing, and includes the device ID information that identifies itself to the reader 20 from the portable device 10 and the inquiry signal only when the received inquiry signal S is valid. Mobile device specific signal including the transmission information to be transmitted and the reception gate designation information in which the reception gate of the reader 20 is selected at random.

  The reader 20 receives the portable device specific signal transmitted from the portable device 10 at a predetermined reception timing, and the transmission information in the portable device specific reception information from the reader-side receiving unit 21 matches the transmission information transmitted from the reader 20. The reader side receiving unit 21 only when the mobile device identification signal is received at the receiving gate specified in the receiving gate specifying information and the transmission information and the receiving gate match. Is compared with the device ID information in the portable device specific reception information from the authentication device ID information stored in the storage means 22a. When it is determined that the mobile device specific reception information from the reader-side receiving unit 21 matches the information from the mobile device 10 registered in the storage unit 22a, the number of times of reception is determined, and the number of times of reception is the first time. When the determination is made, the AGC level of the portable device specific signal at that time is compared with the previous AGC level, and only when it is determined that the level increase is within a predetermined range, the drive signal for unlocking and unlocking the electric lock Output to the unit.

  Thereby, only when the portable information specifying signal added with the transmission information added to the inquiry signal and the device ID information for specifying the portable device 10 itself is received at the reception timing of the reception gate selected at random, the portable device specifying signal is received. The device ID information and the transmission information are compared, the AGC levels of the first and second portable device specific signals are compared when both are normal, and the lock is determined when the level is determined to be within the predetermined range. Therefore, it is difficult to perform unauthorized unlocking by copying a spatial transmission signal using the noise canceller technology, and security can be improved.

  Furthermore, when locking and unlocking the lock, the user can lock and unlock the lock by detecting the approach of carrying the portable device 10 and approaching the reader without performing a special locking and unlocking operation each time. As a result, for example, even a user whose hands are blocked by luggage or the like can be opened with only the elbow after unlocking. In particular, when carrying a heavy load, it is possible to prevent the user from falling over or dropping the transported item. In addition, it can be widely used by small children and elderly people who cannot reach the reader installation height, disabled people with disabilities in the upper limbs, wheelchair users, etc., and can be easily locked and unlocked without touching the reader. , The convenience can be improved.

  In addition, since the reader 20 only needs to be disposed at a position where the induction magnetic field can be activated with the portable device 10, the reader 20 is concealed by an object other than metal (for example, the same wallpaper as the surroundings). be able to. Thereby, restrictions on the arrangement position of the reader 20 are reduced, and the aesthetic appearance is not impaired. If the reader 20 is arranged so as to be hidden, the reader 20 will not be noticed, so that it is possible to prevent damage and functional deterioration due to mischief.

  In the above-described embodiment, the transmission information stored in the storage unit 22a is used as transmission information to be added to the reference number transmitted from the reader 20. However, the present invention is not limited to this. The security can be further improved by generating and adding predetermined transmission information each time a message is transmitted or by newly generating and adding transmission information at regular intervals.

DESCRIPTION OF SYMBOLS 1 ... Electric lock system 10 ... Portable machine 11 ... Portable machine side receiving part (11a ... Reception antenna, 11b ... Reception circuit)
12 ... portable device side control unit (12a ... receiving gate selection means)
13: Portable device side transmitter (13a: transmitting antenna, 13b: transmitting circuit)
DESCRIPTION OF SYMBOLS 14 ... Power supply part 20 ... Reader 21 ... Reader side receiving part (21a ... Reception antenna, 21b ... Reception circuit)
22 ... Reader side control section (22a ... storage means, 22b ... information discriminating means, 22c ... reception count discrimination means, 22d ... AGC level discrimination means)
23: Reader side transmitter (23a: transmitting antenna, 23b: transmitting circuit)
24 ... Communication unit 25 ... Power supply unit

Claims (3)

A portable device that transmits a portable device identification signal for authentication that identifies a user;
A reference number for requesting the portable device specific signal transmitted from the portable device is periodically transmitted, and a portable device specific signal corresponding to the inquiry signal is received at an AGC level corresponding to a communication distance with the portable device. A reader having a plurality of reception gates,
In the electric lock system that performs locking and unlocking using an induced magnetic field that is activated when the portable device approaches within a predetermined communication area of the reader,
When the portable device receives the inquiry signal from the reader at a predetermined reception timing close to the reader communication area, the portable device receives the device ID information for identifying itself and the randomly selected reader. Transmitting the portable device specific signal including reception gate designation information indicating a gate;
The reader receives the portable device identification signal whose device ID information of the portable device identification signal received from the portable device matches the device ID information of the registered portable device at the reception timing of the selected reception gate. When the AGC level of the portable device specific signal at the time of the second reception is compared with the AGC level at the time of the first reception and it is determined that the level increases within a predetermined range, the lock is unlocked. An electric lock system characterized by outputting a signal for locking. A portable device that transmits a portable device identification signal for authentication that identifies a user;
A reference number for requesting the portable device specific signal transmitted from the portable device is periodically transmitted, and a portable device specific signal corresponding to the inquiry signal is received at an AGC level corresponding to a communication distance with the portable device. A reader having a plurality of reception gates,
In the electric lock system that performs locking and unlocking using an induced magnetic field that is activated when the portable device approaches within a predetermined communication area of the reader,
The portable device is close to the reader communication area and receives the inquiry signal to which a predetermined transmission number is added from the reader at a predetermined reception timing. Transmitting the portable device specific signal including a transmission number added to the inquiry signal and reception gate designation information indicating a reception gate of the reader selected at random;
The reader includes the portable device identification signal in which the device ID information of the portable device identification signal received from the portable device matches the device ID information of a registered portable device and matches the transmission number added to the inquiry signal. Is received at the reception timing of the selected reception gate, the AGC level of the portable device specific signal at the second reception is compared with the AGC level at the first reception and within a predetermined range An electric lock system that outputs a signal for locking and unlocking the lock when it is determined that the level is increased. The reader comprises storage means for storing the portable device identification signal and the AGC level information,
When the portable device identification signal received from the portable device has been registered and received for the first time, the received portable device identification signal and AGC level information are stored in the storage means,
When the portable device identification signal received from the portable device has been registered and the increase in the AGC level of the portable device identification signal at the second reception is within the predetermined range, information on the portable device identification signal and the AGC level is obtained. , Deleting from the storage means after the output of the signal for locking and unlocking the lock,
When the portable device identification signal received from the portable device has been registered and the increase in the AGC level of the portable device identification signal at the second reception is not within the predetermined range, information on the portable device identification signal and the AGC level From the storage means,
The electric lock system according to claim 1 or 2, wherein when the portable device identification signal received from the portable device is not registered, the portable device identification signal and the AGC level information are discarded.

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