JP3099107B2 - Anti-theft tag, instruction signal transmission device, parent instruction signal transmission device and anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft system which detects an attached state and a detached state of an object to be stolen and outputs an alarm when the detached state is detected and when a predetermined signal is given in a non-contact manner. The present invention relates to a tag, an instruction signal transmitting device that supplies an instruction signal to the anti-theft tag, a parent instruction signal transmitting device that supplies an instruction signal to the anti-theft tag and the instruction signal transmitting device, and an improvement of an anti-theft device composed of these. .

[0002]

2. Description of the Related Art FIG. 20 is a block diagram showing an essential part of an embodiment of an anti-theft tag filed by the applicant of the present invention. This anti-theft tag is composed of an IC 1 and an external circuit externally attached to the IC 1. When attached to an anti-theft object such as a compact disk, the switch VS operates in conjunction with a pressed button. It is open. The switch VS is a manual operation automatic return b contact.

In this state, if someone tries to take out the anti-theft object, the anti-theft tag receives a predetermined signal from a transmitting device (not shown) installed at the exit of the store and outputs an alarm. . Also, if someone removes the anti-theft tag from the anti-theft object in order to avoid this, the anti-theft tag returns the button, short-circuits the switch VS, and also outputs an alarm in this case.

The IC 1 has an input section 4 for outputting a signal when a short-circuit signal is received from the switch VS, a reset input section 2 for outputting a signal when a reset signal is received from a reset switch RS, and a resonance circuit (antenna circuit). The antenna input unit 3 receives a signal from the antenna input unit 3, converts the code signal into a code signal, and outputs the code signal. The code input unit 3 identifies a code signal given from the antenna input unit 3 and outputs a signal indicating the identification result. Further, the IC 1 receives a signal and a code (an identification result signal thereof) from the input unit 4, the reset input unit 2, and the code identification unit 7, and performs a signal processing unit 5 that performs processing according to the received signal and the code; Receiving the alarm signal from the part 5, the light emitting diode LED and the buzzer B
A driving unit 8 for driving the UZ, and an oscillation circuit 6 for applying an oscillation pulse of a predetermined frequency to the antenna input unit 3, the signal processing unit 5, and the like are provided.

When the input section 4 is used for a WT type anti-theft tag, which will be described later, the input section 4 outputs a signal different from that of the VS type, but in that case, the signal processing section 5 outputs the signal to the input section 4. Is recognized as a signal from The power supply voltage of IC1 is supplied to each part in IC1 via a power supply terminal VT connected to the anode of battery BAT of the external circuit, and the ground potential is supplied via ground terminal GT connected to the cathode of battery BAT. And is given to each part in IC1.

The input terminal of the input section 4 is connected to one terminal of a switch VS of an external circuit, and the other terminal of the switch VS is grounded. One terminal of a reset switch RS of an external circuit is connected to an input terminal of the reset input unit 2, and the other terminal of the reset switch RS is grounded. A capacitor C4 is connected in parallel to the reset switch RS. The reset switch RS is
It is provided inside a keyhole provided on the surface of the anti-theft tag, and is short-circuited when a key is inserted.

In the oscillation circuit 6, a resistor R1 of an external circuit is connected between two terminals and a capacitor C1 of the external circuit is connected to one terminal thereof in order to determine an oscillation frequency. The input terminal of the antenna input unit 3 is connected to the collector of an npn transistor TR1.
Are grounded. The base of the transistor TR1 has a resistor R connected at the other end to the anode of the battery BAT.
6, a resistor R5 whose other end is grounded, and one terminal of a capacitor C5. The other terminal of the capacitor C5 is connected via a resistor R2 to a parallel circuit of the capacitor C2 and the coil L1, and the other side of this parallel circuit is grounded. The capacitor C2 and the coil L1 constitute a resonance circuit.

The output terminal of the driving section 8 is connected to the cathode of the light emitting diode LED via a resistor R4, and the anode of the light emitting diode LED is connected to the anode of the battery BAT. The other output terminal of the drive unit 8 is p
A resistor R3 connected to the base of the np transistor TR2
Is connected, and the emitter of the transistor TR2 is connected to the battery BA.
The collector is connected to the anode of T and the other terminal is connected to the battery B
It is connected to one terminal of a buzzer BUZ connected to the anode of the AT. One terminal of the buzzer BUZ is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the coil L2, the other of which is grounded. A capacitor C3 is connected in parallel to the battery BAT.

[0009] The anti-theft tag having such a configuration is provided by a remote control key (not shown), a set code,
A non-contact signal modulated into a reset code, a code indicating an operation mode change, and a code indicating a change in the type of an anti-theft tag classified according to a method of detecting the state of attachment or detachment of the anti-theft object. A radio wave, which is an example of the above, is transmitted through a capacitor C2 and a coil
Is received by the resonance circuit composed of

Here, the operation mode is as follows.
A first operation mode in which an operation state (set mode = a state in which an alarm can be output) is established when the apparatus is attached to the anti-theft object; And a second operation mode. When the anti-theft tag is given a reset code, the anti-theft tag enters a reset mode (a state in which an alarm is not output even if the tag is removed or a predetermined signal is received from the transmitting device while being attached to the anti-theft object). . However, in the first operation mode, a release time (for example, 32 seconds) for removing the anti-theft tag from the anti-theft object is measured, and if the tag is not removed when the release time elapses (the switch VS is turned off). If it has been released), return to the set mode.

The code for instructing the change of the type of the anti-theft tag is combined with the code for instructing the change of the operation mode and given as a signal for indicating the mode of the anti-theft tag. After the set code is given, the anti-theft tag does not accept the code from the remote control key for two seconds, for example.

The radio wave received by the resonance circuit is input to the antenna input unit 3 by driving the transistor TR1 and demodulated into a code signal. The demodulated code signal is identified by the code identification unit 7, and the code (identification result signal thereof) is provided to the signal processing unit 5. Signal processing unit 5
Sets the anti-theft tag in each mode according to the given code (identification result signal),
Output the setting confirmation signal to the LED.
Flashes. At this time, the driving unit 8 controls the transistor T
R2 is driven and the buzzer BUZ is sounded. Buzzer B
In the UZ, the current of the sound signal flows through the coil L1, so that an optimum voltage for the sound is applied.

[0013] The anti-theft tag is installed at the entrance when someone in the set mode tries to put out the anti-theft object to which the anti-theft tag is attached from the entrance of the area where the anti-theft tag is installed. The resonance circuit of the capacitor C2 and the coil L1 resonates by the radio wave of the predetermined signal transmitted from the transmitting device. This resonance voltage is input to the antenna input unit 3 by driving the transistor TR1, and is demodulated into a code signal of the alarm input. The demodulated code signal of the alarm input is identified by the code identification unit 7, and the identification result is given to the signal processing unit 5.

In addition, in the set mode, when someone removes the anti-theft tag from the anti-theft object in the set mode, the button returns and the switch VS is turned off. Is short-circuited, the signal processing unit 5 recognizes the signal through the input unit 4, causes the driving unit 8 to output an alarm signal, and sets the anti-theft tag to the alert mode. The alarm signal causes the light emitting diode LED to blink when the output terminal of the drive unit 8 becomes L level at 8 Hz, for example. At this time, the drive section 8 drives the transistor TR2 by the sound signal to sound the buzzer BUZ.

The signal processing unit 5 recognizes the alarm input based on the identification result of the alarm input code, causes the drive unit 8 to output an alarm signal, and sets the anti-theft tag to an alarm mode. The alarm signal causes the light emitting diode LED to blink when the output terminal of the drive unit 8 becomes L level at 8 Hz, for example. At this time, the drive section 8 drives the transistor TR2 by the sound signal to sound the buzzer BUZ.

This anti-theft tag stops the operation of the buzzer BUZ in the alert mode or the set mode when the buzzer BUZ is stopped or the anti-theft object is bought by the customer and the anti-theft tag is removed. Sometimes, switch V
When S is released and the reset switch RS is short-circuited by the key, the signal processing unit 5 recognizes the signal through the reset input unit 2, resets the anti-theft tag to the reset mode, and transmits the setting confirmation signal. Output. In addition, as described above, the reset mode is also provided by receiving the reset code, and the setting confirmation signal is output.

Since the type and operation mode of this anti-theft tag can be changed by a signal given in a non-contact manner, after attaching the anti-theft tags to a certain number of products, the tags are collectively attached. Activating, activating or deactivating all of the anti-theft tags for a certain number of products without removing the anti-theft tags. By simply attaching / removing the tag, a single type of tag can be used in various ways, such as a method of putting the tag into an active state / non-operating state.

As an example of providing a signal to an anti-theft tag in a non-contact manner in addition to a signal from a transmitting device installed at an entrance, there is an electronic monitoring system described in Japanese Patent Publication No. 3-45436. The signal provided by the electronic monitoring system in a non-contact manner is a series of operation instruction information such as set and reset and inventory management information in one kind of anti-theft tag, and an operation method (operation) after manufacturing and assembling the anti-theft tag. Mode) and the detection method (VS type, WT type) are not changed and set.

[0019]

However, among stores where anti-theft devices using these anti-theft tags are introduced, the reset code for setting the above-mentioned reset mode is common. Therefore, for example, if the same anti-theft device is installed in a store adjacent to each other, the anti-theft tag of the store B next to the store A can be set to the reset mode by the remote control key of the store A. It may not be useful. Also, once the remote control key of a store is stolen or the reset code is known, the store, as well as all stores that have installed the same anti-theft device as the store, will have the anti-theft device. However, there is a problem that the function cannot be performed.

The present invention has been made in view of the circumstances described above, and according to the first, fourth, and eighth inventions, an anti-theft tag capable of setting a different reset code for each store, It is an object to provide an instruction signal transmitting device and an anti-theft device. An object of the second, fourth, and eighth inventions is to provide an anti-theft tag, an instruction signal transmitting device, and an anti-theft device that can output a warning when a different reset code is received. It is an object of the third, sixth, seventh, and ninth inventions to provide an anti-theft tag, a parent instruction signal transmitting device, an instruction signal transmitting device, and an anti-theft device that can easily change a reset code. . A fifth invention aims to provide an instruction signal transmitting device having an anti-theft function.

[0021]

According to a first aspect of the present invention, there is provided an anti-theft tag comprising: detecting means for detecting an attached state and a detached state with respect to an anti-theft object; receiving means for receiving a signal in a non-contact manner; An alarm output unit that outputs an alarm when the detection unit detects a detached state and when the reception unit receives a predetermined signal, wherein the reception unit operates when the alarm output unit operates. Instructs the possible states and the release of the alarm output state,
An identification unit for identifying the predetermined signal and the release instruction signal received by the receiving unit while enabling to receive a release instruction signal including an encryption code; an encryption storage unit for storing an encryption code in advance; A coincidence determining means for determining whether or not the encryption code included in the release instruction signal identified by the identification means and the encryption code stored in the encryption storage means match; The alarm output means is provided with a operable state and a release means for releasing the alarm output state.

In this anti-theft tag, the receiving means receives a release instruction signal including an encryption code for instructing the alarm output means to be operable and the alarm output state to be released. On the other hand, the identification means identifies the predetermined signal and the release instruction signal received by the reception means. And the coincidence determination means
It is determined whether or not the encryption code included in the release instruction signal identified by the identification means and the encryption code stored in the encryption storage means match. When the match determination means determines that they match, the release means outputs an alarm output. The state in which the means is operable and the alarm output state are released. Thus, the anti-theft tag can set a different release instruction signal for each store, and can more reliably prevent theft.

The anti-theft tag according to the second invention is characterized in that it comprises a warning output means for outputting a warning when the coincidence judgment means judges that they do not match. In this anti-theft tag, the warning output unit outputs a warning when the coincidence determination unit determines that they do not match. For example, an instruction signal transmitting device that transmits a release instruction signal that is stolen from another store is transmitted. If you try to reset using it, it will be revealed immediately. Further, since it is difficult to know the encryption code of the release instruction signal by thinking and error, theft can be more reliably prevented.

[0024] In the anti-theft tag according to a third aspect of the present invention, the encryption storage means stores the stored contents in the new encryption code by an encryption change instruction signal received by the receiving means and instructing a change to a new encryption code. It is characterized by updating. In this anti-theft tag, the encryption storage means can update the storage content to a new encryption code by the encryption change instruction signal received by the reception means, so that the instruction signal transmitting device for transmitting the release instruction signal is stolen. Even if the encryption code of the release instruction signal is known, the encryption code can be easily changed, and theft can be more reliably prevented.

According to a fourth aspect of the present invention, there is provided an instruction signal transmitting apparatus which stores an encryption code to be included in a release instruction signal to be received by a receiving means of the anti-theft tag according to any one of claims 1 to 3. Means, and transmitting means for transmitting the release instruction signal including the encryption code stored in the encryption storage means.

In this instruction signal transmitting device, the encryption storage means stores an encryption code to be included in the release instruction signal. Then, the transmitting means transmits the release instruction signal including the encryption code stored in the encryption storage means. Thus, the instruction signal transmitting device can transmit a different release instruction signal for each store, and can more reliably prevent theft.

An instruction signal transmitting device according to a fifth aspect of the present invention includes a receiving means for receiving a signal in a non-contact manner, and an alarm output means for outputting an alarm when the receiving means receives a predetermined signal. And In this instruction signal transmitting device, when the receiving unit receives the predetermined signal, the alarm output unit outputs an alarm. Thereby, this instruction signal transmitting device is
It can be prevented from being stolen or taken out of the store without permission.

[0028] According to a sixth aspect of the present invention, there is provided a parent instruction signal transmitting apparatus, wherein: a cipher setting means for setting a new encryption code to be stored in an encryption storage means provided in the anti-theft tag; Transmitting means for transmitting an encryption change instruction signal to be received including the new encryption code set by the encryption setting means.

In this parent instruction signal transmitting device, the encryption setting means sets a new encryption code to be stored in the encryption storage means provided in the anti-theft tag. Then, the transmitting means transmits an encryption change instruction signal including the new encryption code set by the encryption setting means. Thereby, this parent instruction signal transmission device, even if the instruction signal transmission device that transmits the release instruction signal is stolen or the encryption code of the release instruction signal is known,
The encryption code can be easily changed, and theft can be more reliably prevented.

According to a seventh aspect of the present invention, there is provided an instruction signal transmitting device including receiving means for receiving an encryption change instruction signal transmitted by the parent instruction signal transmitting device according to claim 6, wherein the encryption storage means comprises:
The storage contents are updated by a new encryption code included in the encryption change instruction signal received by the receiving means.

In this instruction signal transmitting device, the receiving means comprises:
An encryption change instruction signal transmitted from the parent instruction signal transmitting device is received. Then, the encryption storage unit updates the storage content with the new encryption code included in the encryption change instruction signal received by the reception unit. Thereby, this instruction signal transmission device can easily change the encryption code even if another instruction signal transmission device that transmits the release instruction signal is stolen or the encryption code of the release instruction signal is known. Theft can be reliably prevented.

The anti-theft device according to the eighth invention is characterized in claim 1
Or a transmitting device for transmitting a predetermined signal to be received by the receiving means of the anti-theft tag, and an instruction signal transmitting device according to claim 4 or 5. In this antitheft device, the transmitting device transmits a predetermined signal to be received by the receiving means of the antitheft tag.
The instruction signal transmitting device transmits a release instruction signal to be received by the anti-theft tag receiving means. Thus, the anti-theft device can set a different anti-theft tag reset code for each store, and can more reliably prevent theft.

According to a ninth aspect of the present invention, there is provided a theft prevention device.
7. An anti-theft tag according to claim 6, wherein said transmitting means transmits a predetermined signal to be received by a receiving means of said anti-theft tag.
A parent instruction signal transmitting device described above and an instruction signal transmitting device according to claim 7 are provided.

In this antitheft device, the transmitting device transmits a predetermined signal to be received by the receiving means of the antitheft tag.
The instruction signal transmitting device transmits a release instruction signal to be received by the anti-theft tag receiving means. The parent instruction signal transmitting device sets a new encryption code to be stored in the encryption storage device of the anti-theft tag and the encryption storage device of the instruction signal transmitting device, and receives the anti-theft tag receiving device and the receiving device of the instruction signal transmitting device. Is transmitted while being included in the encryption change instruction signal to be received. Thus, the anti-theft device can easily change the encryption code even if the instruction signal transmitting device is stolen or the encryption code of the release instruction signal is known, and can more reliably prevent theft. .

[0035]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an anti-theft tag, an instruction signal transmitting device, a parent instruction signal transmitting device and an anti-theft device according to the present invention. FIG. 1 is a block diagram showing a main configuration of an example of an embodiment of an anti-theft tag according to the present invention. This anti-theft tag is composed of an IC 1 and an external circuit externally attached to the IC 1. When attached to an anti-theft object such as a compact disk, the switch VS operates in conjunction with a pressed button. It is open. Switch VS
Denotes a manual operation automatic return b contact.

In this state, if someone tries to take out the anti-theft object, the anti-theft tag receives a predetermined signal from the transmitting device (TX in FIG. 8) installed at the outlet of the store and outputs an alarm. I do. Also, if someone tries to avoid this by removing the anti-theft tag from the anti-theft object,
In the anti-theft tag, the button returns and the switch VS is short-circuited,
Also in this case, an alarm is output. As described above, the type of the anti-theft tag that detects the attachment / detachment state with respect to the anti-theft object is set by the switch VS linked to the button.
Type.

The IC 1 has an input section 4 for outputting a signal when a short-circuit signal is received from the switch VS, a reset input section 2 for outputting a signal when a reset signal is received from the reset switch RS, and a resonance circuit (antenna circuit). The antenna input unit 3 receives a signal from the antenna unit 3, converts the code signal into a code signal and outputs the code signal, and a code identification unit 7a that identifies the code signal given from the antenna input unit 3 and outputs the identification result signal.

The IC 1 receives a signal and a code (identification result signal thereof) from the input unit 4, the reset input unit 2, and the code identification unit 7a, and processes the signal and the code in accordance with the received signal and code. An encryption code storage unit 9 that stores an encryption code included in a reset code of a code accepted by the signal processing unit 5, a driving unit 8 that receives an alarm signal from the signal processing unit 5, and drives a light emitting diode LED and a buzzer BUZ. And an oscillating circuit 6 for applying an oscillating pulse of a predetermined frequency to the antenna input unit 3, the signal processing unit 5, and the like.

When the input unit 4 is used for a WT type anti-theft tag, which will be described later, the input unit 4 outputs a signal different from that of the VS type. In that case, the signal processing unit 5 outputs the signal. Is recognized as a signal from The power supply voltage of IC1 is supplied to each part in IC1 via a power supply terminal VT connected to the anode of battery BAT of the external circuit, and the ground potential is supplied via ground terminal GT connected to the cathode of battery BAT. And is given to each part in IC1.

The input terminal of the input section 4 is connected to one terminal of a switch VS of an external circuit, and the other terminal of the switch VS is grounded. One terminal of a reset switch RS of an external circuit is connected to an input terminal of the reset input unit 2, and the other terminal of the reset switch RS is grounded. A capacitor C4 is connected in parallel to the reset switch RS. The reset switch RS is
It is provided inside a keyhole provided on the surface of the anti-theft tag, and is short-circuited when a key is inserted.

In the oscillation circuit 6, a resistor R1 of an external circuit is connected between two terminals, and a capacitor C1 of the external circuit is connected to one terminal thereof in order to determine an oscillation frequency. The input terminal of the antenna input unit 3 is connected to the collector of an npn transistor TR1.
Are grounded. The base of the transistor TR1 has a resistor R connected at the other end to the anode of the battery BAT.
6, a resistor R5 whose other end is grounded, and one terminal of a capacitor C5. The other terminal of the capacitor C5 is connected via a resistor R2 to a parallel circuit of the capacitor C2 and the coil L1, and the other side of this parallel circuit is grounded. Resistor R2, capacitor C2 and coil L1
Constitutes a resonance circuit.

The output terminal of the drive section 8 is connected to the cathode of the light emitting diode LED via a resistor R4, and the anode of the light emitting diode LED is connected to the anode of the battery BAT. The other output terminal of the drive unit 8 is p
A resistor R3 connected to the base of the np transistor TR2
Is connected, and the emitter of the transistor TR2 is connected to the battery BA.
The collector is connected to the anode of T and the other terminal is connected to the battery B
It is connected to one terminal of a buzzer BUZ connected to the anode of the AT. One terminal of the buzzer BUZ is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the coil L2, the other of which is grounded. A capacitor C3 is connected in parallel to the battery BAT.

FIG. 2 is a block diagram showing a main part of another example of the embodiment of the anti-theft tag according to the present invention. This anti-theft tag is composed of an IC 1 and an external circuit externally attached thereto, and is connected by a conductive wire W which is attached while being entangled with a button hole or the like of an anti-theft object such as clothing. , A part of the circuit is short-circuited. In this state, if someone tries to take out the anti-theft object, the anti-theft tag receives a predetermined signal from the transmitting device (TX in FIG. 8) installed at the exit of the store and outputs an alarm.

Also, if someone tries to avoid this,
When the conductive wire W is detached from the anti-theft tag in order to remove the anti-theft tag from the anti-theft object, a part of the circuit is opened, and the anti-theft tag outputs an alarm also in this case. As described above, the type of the anti-theft tag that detects the attachment / detachment state of the anti-theft object by attaching / detaching the conductive wire W is the WT type.

The configuration of this WT type anti-theft tag is as follows:
What is different from the above VS type anti-theft tag is
At the position of the switch VS, instead of the switch VS, a conducting wire W is connected and locked so as not to be easily detached, and a key is inserted into a keyhole provided on the surface of the anti-theft tag, The lock of the conductive wire W is released, and the reset switch RS is short-circuited in conjunction with the release of the lock. The other configuration is the same as the configuration of the VS type anti-theft tag described above, and the description is omitted.

The VS type anti-theft tag, which outputs an alarm when the switch VS is short-circuited and when a predetermined signal is received from the transmitting device, described in FIG. Radio waves modulated into a set code, a reset code, a code for instructing a change in the operation mode, and a code for instructing a change in the VS type / WT type are transmitted to a resistor R2, a capacitor C2, and a coil L.
The signal is received by the resonance circuit composed of 1.

Here, the operation mode is as follows.
A first operation mode in which an operation state (set mode = a state in which an alarm can be output) is established when the apparatus is attached to the anti-theft object; And a second operation mode. When a reset code (release instruction signal) is given to the anti-theft tag, the tag outputs an alarm even if it is removed or receives a predetermined signal from the transmitting device in a reset mode (attached to the anti-theft object). State). However, in the first operation mode, a release time (for example, 32 seconds) for removing the anti-theft tag from the anti-theft object is measured, and if the tag is not removed when the release time elapses (the switch VS is turned off). If it has been released), return to the set mode. During the release time, the mode is a release mode in which codes other than the reset code are not accepted.

The code for instructing the change of the VS type / WT type is combined with the code for instructing the change of the operation mode, and the VSN code (VS type / second operation mode) and the VSO code (VS type / first operation), respectively. Mode), WTN code (WT type, 2nd operation mode),
It is given as a WTO code (WT type, first operation mode). This anti-theft tag uses VSN code, VSO
Given a code, a WTN code, and a WTO code, a VSN mode, a VSO mode, and a state to be detected by the type of detection method and an operation mode thereof, respectively.
It becomes WTN mode and WTO mode. After the set code is given, the anti-theft tag is, for example, 2
Do not accept codes from remote control keys for seconds.

The radio wave received by the resonance circuit is input to the antenna input unit 3 by driving the transistor TR1, and is demodulated into a code signal. The demodulated code signal is identified by the code identification unit 7, and the code (identification result signal thereof) is provided to the signal processing unit 5. Signal processing unit 5
Sets the anti-theft tag in each mode according to the given code (identification result signal),
Output the setting confirmation signal. The setting confirmation signal causes the light emitting diode LED to blink when the output terminal of the driving unit 8 becomes L level at 8 Hz, for example.

In this case, when the driving mode is set to the set mode, the driving section 8 outputs four pulses for one cycle of the L level signal of 8 Hz.
When the sounding signal of kHz is superimposed and set in the reset mode and the canceling mode (however, except when the mode transits from the canceling mode to the resetting mode), the sounding signal of 4 kHz is generated in two cycles of the L level signal of 8 Hz. The transistor TR2 is driven by the superposition, and the buzzer BUZ is sounded. The buzzer BUZ uses the coil L1
, An optimal voltage for sounding is given.

When the given code is a reset code, the signal processing unit 5 determines whether the encryption code stored in the encryption code storage unit 9 matches the encryption code included in the reset code. judge. When it is determined that they match, the anti-theft tag is set to the reset mode. When it is determined that they do not match, the anti-theft tag is set to the warning mode, and the drive unit 8 outputs a warning signal. The warning signal is output when the output terminal of the drive unit 8 is 8H, for example.
It goes to the L level with the rhythm of two cycles of z and one cycle pause, and the light emitting diode LED blinks. At this time, the driving unit 8 sets the L of the rhythm of the two-cycle continuous one-period pause of 8 Hz.
A sound signal of 4 kHz is superimposed on the level signal to drive the transistor TR2 and sound the buzzer BUZ.

When the VS type anti-theft tag is set in the set mode, if someone tries to put out the anti-theft object to which the anti-theft tag is attached from the entrance of the area where the anti-theft tag is installed, The resonance circuit of the resistor R2, the capacitor C2, and the coil L1 resonates by a radio wave of a predetermined signal transmitted from the transmitting device installed in the device. This resonance voltage is input to the antenna input unit 3 by driving the transistor TR1, and is demodulated into a code signal of the alarm input. The demodulated code signal of the alarm input is identified by the code identification unit 7, and the identification result is given to the signal processing unit 5.

Further, this VS type anti-theft tag is
In the set mode, when someone removes the anti-theft tag from the anti-theft object in order to avoid the above, the button is restored and the switch VS is short-circuited, and the signal processing unit 5 receives the input signal. The signal is recognized through the unit 4 and an alarm signal is output to the drive unit 8 to set the anti-theft tag to the alert mode. The alarm signal causes the light emitting diode LED to blink when the output terminal of the drive unit 8 becomes L level at 8 Hz, for example. At this time, the drive unit 8 superimposes a 4 kHz sound signal on the 8 Hz L level signal, drives the transistor TR2, and sounds the buzzer BUZ.

The signal processing unit 5 recognizes the alarm input based on the identification result of the alarm input code, causes the drive unit 8 to output an alarm signal, and sets the anti-theft tag to the alarm mode. The alarm signal causes the light emitting diode LED to blink when the output terminal of the drive unit 8 becomes L level at 8 Hz, for example. At this time, the drive unit 8 outputs 4 Hz to the L level signal of 8 Hz.
A sound signal of kHz is superimposed, the transistor TR2 is driven, and the buzzer BUZ sounds.

This VS type anti-theft tag operates in the alarm mode or the set mode to stop the buzzer BUZ from sounding or to remove the anti-theft tag when the anti-theft object is bought by the customer. When the switch VS is opened and the reset switch RS is short-circuited by a key, for example, when stopping the operation, the signal processing unit 5 recognizes the signal through the reset input unit 2 and changes the anti-theft tag to W.
The mode is reset to the reset mode of the TO mode, and the setting confirmation signal is output.

If a reset code is given when stopping the buzzer BUZ or stopping the operation of the anti-theft tag, the signal processing unit 5 causes the signal processing unit 5 to store the encryption code stored in the encryption code storage unit 9. It is determined whether the code matches the encryption code included in the reset code. When it is determined that they match, the anti-theft tag is set to the reset mode. When it is determined that they do not match, the anti-theft tag is set to the warning mode, and the drive unit 8 outputs a warning signal. The warning signal causes the output terminal of the drive unit 8 to go to the L level with a rhythm of, for example, two continuous periods of 8 Hz and a one-period pause, causing the light emitting diode LED to blink. At this time, the driving unit 8 superimposes a sound signal of 4 kHz on an L level signal of a rhythm of a continuous rhythm of two cycles of one cycle of 8 Hz, drives the transistor TR2, and drives the buzzer B
Ring UZ.

W for outputting an alarm when a part of the circuit short-circuited by the conductive wire W described in FIG. 2 is opened and when a predetermined signal is received from the transmitting device.
The T-type anti-theft tag transmits radio waves modulated from a remote control key, which will be described later, to a set code, a reset code, a code for instructing a change in the operation mode, and a code for instructing a change in the VS type / WT type.
2, the signal is received by a resonance circuit composed of the capacitor C2 and the coil L1.

When the anti-theft tag is given a reset code, the anti-theft tag does not output an alarm even if it is detached or receives a predetermined signal from the transmitting device while being attached to the anti-theft object. )become. However,
In the first operation mode, a release time (for example, 32 seconds) for removing the anti-theft tag from the anti-theft object is measured, and if the anti-theft tag has not been removed after the release time has elapsed (the conduction wire W is not connected). If so, return to the set mode.

When the WT type anti-theft tag is set in the set mode, when someone tries to move the anti-theft object to which the anti-theft tag is attached from the entrance of the area where the anti-theft tag is installed, the entrance / exit of the WT type anti-theft tag is performed. The resonance circuit of the resistor R2, the capacitor C2, and the coil L1 resonates by a radio wave of a predetermined signal transmitted from the transmitting device installed in the device. This resonance voltage is input to the antenna input unit 3 by driving the transistor TR1, and is demodulated into a code signal of the alarm input. The demodulated code signal of the alarm input is identified by the code identification unit 7, and the identification result is given to the signal processing unit 5.

This WT type anti-theft tag is
In the set mode, when someone cuts the conductive wire W and removes it from the anti-theft object in order to avoid the above, the signal processing unit 5 recognizes the signal through the input unit 4. Then, an alarm signal is output to the drive unit 8, and the anti-theft tag is set to the alert mode. The alarm signal is
When the output terminal of the drive unit 8 becomes L level at, for example, 8 Hz, the light emitting diode LED blinks. At this time, the drive unit 8 superimposes a 4 kHz sound signal on the 8 Hz L level signal to drive the transistor TR2,
Ring the buzzer BUZ.

The signal processing unit 5 recognizes the alarm input based on the identification result of the alarm input code, causes the drive unit 8 to output an alarm signal, and sets the anti-theft tag to the alarm mode. The alarm signal causes the light emitting diode LED to blink when the output terminal of the drive unit 8 becomes L level at 8 Hz, for example. At this time, the drive unit 8 outputs 4 Hz to the L level signal of 8 Hz.
A sound signal of kHz is superimposed, the transistor TR2 is driven, and the buzzer BUZ sounds.

The WT type anti-theft tag operates in the alert mode or the set mode to stop the buzzer BUZ from sounding or to remove the anti-theft tag when the anti-theft object is bought by the customer. When the key is stopped, the lock of the conductive wire W is released by the key, and the connection is released. In conjunction with this, the reset switch R
When S is short-circuited, the signal processing unit 5 sets the reset input unit 2
Through WTO, and recognizes the signal through WTO
The mode is reset to the reset mode, and the setting confirmation signal is output. The other operations are the same as those of the above-described VS type anti-theft tag, and thus the description thereof is omitted.

FIG. 3 shows a set code, a reset code, a code for instructing a change of the operation mode, and a code for instructing the change of the VS type / WT type to the VS type and WT type anti-theft tags. FIG. 11 is a block diagram showing a configuration of a master remote control key MRK (parent instruction signal transmission device) for transmitting, by radio waves, an encryption code change code for instructing a change of an encryption code included in a reset code. This master remote control key M
RK includes a set button SB and a reset button RSB for instructing a set mode and a reset mode, and a first operation mode button ONE for instructing setting to a first operation mode.
A second operation mode button NOR for instructing setting to the second operation mode and a VSN mode button VSN for instructing setting to the VSN mode are connected to the 4-bit microcomputer 10.

The microcomputer 10 has V
VSO mode button V for instructing setting to SO mode
SO and WTN for instructing setting to WTN mode
A mode button WTN, a WTO mode button WTO for instructing setting to the WTO mode, an oscillation circuit 12 for clock generation, a light emitting diode 11, and an LC resonance circuit 1.
3 (antenna circuit), an encryption switch CRS for changing and setting the encryption code included in the reset code, and an encryption change button CRB for instructing to change the encryption code.
A changeover switch XS for switching between a master remote control key MRK and a remote control key to be described later is connected. The master remote control key MRK and the remote control key have a common circuit configuration, and are set individually by the changeover switch XS during assembly.

The master remote control key MRK having such a configuration includes buttons SB, RSB, NOR, ONE,
When any one of VSN, VSO, WTN, and WTO is operated, the microcomputer 10 sets the set code, reset code, second operation code, first operation code, VSN setting code, VSO One of the setting code, the WTN setting code, and the WTO setting code is modulated through the LC resonance circuit 13 and transmitted. When the microcomputer 10 is transmitting the code,
The light emitting diode 11 is turned on.

When the encryption switch CRS is operated, the microcomputer 10 changes the encryption code included in the reset code to a new encryption code in accordance with the operation. When the encryption change button CRB is operated, the microcomputer 10 sets the encryption change code for instructing the change to the set encryption code to L.
The signal is modulated and transmitted through the C resonance circuit 13.

FIG. 4 shows a remote control key RK for transmitting only a set code and a reset code to the VS type and WT type anti-theft tags by radio waves.
FIG. 3 is a block diagram illustrating a configuration of an (instruction signal transmitting device).
The remote control key RK includes a set button SB and a reset button RSB for instructing a set mode and a reset mode, and an oscillation circuit 12 for generating a clock.
, A light emitting diode 11 and an LC for transmitting radio waves
An encryption change code signal for instructing an encryption code change from the resonance circuit 13 (antenna circuit) and the master remote control key MRK, and a predetermined signal from a transmitting device (TX in FIG. 8) installed at the outlet of the store. An LC resonance circuit 14 for reception and a changeover switch XS for switching between a master remote control key MRK and a remote control key RK are connected to the 4-bit microcomputer 10.

A buzzer BUZ that sounds when the LC resonance circuit 14 receives a predetermined signal is connected to the 4-bit microcomputer 10. The 4-bit microcomputer 10 stores an encryption code to be included in the reset code, and when the LC resonance circuit 14 receives the encryption change code signal, updates the code to a new encryption code. L
Only when receiving the encryption change code signal from the master remote control key MRK,
Switch RC for activating LC resonance circuit 14
S is connected. The switch RCS is a manual operation automatic return a contact. The remote control key RK is formed and used as a handy type for giving a signal to an individual anti-theft tag.

When any one of the buttons SB and RSB is operated, the microcomputer 10 causes the microcomputer 10 to change the set code or the reset code corresponding to the operated button. The signal is modulated and transmitted through the LC resonance circuit 13. The microcomputer 10 turns on the light emitting diode 11 when transmitting the code. Further, if the encryption change code signal is received through the LC resonance circuit 14 when the switch RCS is operated, the microcomputer 10
The encryption code stored to be included in the reset code,
Update with the new encryption code included in the encryption change code. When the LC resonance circuit 14 receives the predetermined signal, the buzzer BUZ sounds and the light emitting diode 11 blinks.

Master remote control key MRK
Is a handy type for giving a signal to an individual anti-theft tag and a remote control key RK, and a size of, for example, about 30 cm × 30 cm for putting a certain number of the anti-theft tags on the tag and giving a signal. It is formed into a plate-shaped tabletop type. However, the desktop type is not provided with the encryption switch CRS for setting the encryption code and the encryption change button CRB for instructing the change of the encryption code, and the LC resonance circuit 14 for receiving the encryption change code signal is not provided. And a switch RCS, so that an encryption change code signal from the handy type master remote control key MRK is received and the encryption code of the reset code can be changed.

FIG. 5 is an explanatory diagram for explaining the structure of the code signal transmitted by the master remote control key MRK and the remote control key RK. The start bit at the head of the code signal has a length of 20 msec, and is at the H level 15 msec from the rise (a). The data bit “0” has a length of 8 msec, and is at the H level for 2 msec from the rise (b). The data bit “1” has a length of 12 msec, and is at the H level for 8 msec from the rising edge (c).

This code signal is composed of a start bit S0 and subsequent data bits D0 to D11. Of the data bits D0 to D11, the data bits D0 to
D5 is a data code, which is interleaved and transmitted in the order of D2 D3 D4 D5 D0 D1 (c). The data bits D6 to D11 are, as shown in FIG. 6, inverted bits of the data codes D0 to D5, and are further inverted on the receiving side, so that D0 to D5 = D6 to D5.
If it is 11 bars, it is to confirm that it was received correctly. For example, if the data codes D0 to D5 are "01"
If the code signal is “0101”, the code signal is “S0010101”.
101010 ″ (FIG. 5D).

FIG. 7 shows the data codes D0 to D5 described above.
Set code, reset code, encryption change code, W
Examples of TN setting code, WTO setting code, VSN setting code, VSO setting code, first operation code, and second operation code “010101”, “00“ encryption ””, “11”
"Encryption", "100101", "100110",
“101001”, “101010”, “01101”
It is a chart showing “1” and “011000.” “Encryption” is a four-digit encryption code.

FIG. 8 is a conceptual diagram showing a configuration example of a main part of an embodiment of an anti-theft device according to the present invention. In this anti-theft device, an anti-theft tag T is attached to a button hole or the like of an anti-theft object (product) such as clothing at a sales floor in a store (A). A desk-top type master remote control key TRK is installed at a cash register near the exit of the store, and the anti-theft tag T is switched from the set mode to the reset mode simply by placing a product thereon. The anti-theft tag T is removed from the product after entering the reset mode. When someone tries to take out a product to which the anti-theft tag T in the set mode is attached from the exit of the store, the anti-theft tag T receives a predetermined signal from the transmitting device TX installed at the exit and issues an alarm. (B).

When changing the encryption code included in the reset code, the responsible person takes out the handy type master remote control key MRK, which is usually kept strictly in the safe, from the safe and sets a new encryption code. Then, an encryption change code signal is transmitted. The remote control key RK and the anti-theft tag T receive this encryption change code signal and update the encryption code stored in each encryption storage means (C). The operation mode of the anti-theft tag T and switching between the VS type and the WT type are performed by a handy type master remote control key MRK.
Or a desktop type master remote control key TR
Performed by K (C, B).

FIG. 9 is a flowchart showing the operation of the antenna input unit 3 and the code identification unit 7a of the anti-theft tag shown in FIGS. Hereinafter, operations of the antenna input unit 3 and the code identification unit 7a will be described based on the flowchart. The antenna input unit 3 outputs the H level LFIN signal LF only while receiving a carrier wave from a transmitter installed at an entrance or the like in an area where the anti-theft tag is installed.
Demodulation is performed by creating IN (H).

The antenna input unit 3 detects whether the length of the demodulated LFIN signal LFIN (H) is longer than 12 msec, for example, by detecting a level every 5 seconds from the rising edge (S10). If not, ignore it as a meaningless signal. If it is longer, then LF
It is determined whether or not the length of the IN signal LFIN (H) is longer than 100 msec (S12).
The signal LFIN (H) is given to the code identification unit 7a as a code of a predetermined signal (alarm input code) for issuing an alarm from the transmitter. If not long, this LFIN
The reading of data bits is started with the signal LFIN (H) as a start bit S0 (S14). The antenna input unit 3 compares the length of the demodulated LFIN signal LFIN (H) by detecting, for example, a level every 5 seconds from the rise.

The length of the read data bit LFIN signal LFIN (H) is 20 msec.
It is compared whether or not it is longer than c (S16). If it is longer, it is regarded as a meaningless signal and the following reading is stopped. Also, the L-level LFIN signal LFI of the read data bit is
The length of N (L) (time during which no carrier is received) is 20
It is determined whether the time is longer than msec (S18).
When a new start bit S0 is confirmed during reading of data bits, the antenna input unit 3 discards the already read data bits and starts reading of new data bits.

The antenna input unit 3 converts the data bits into 12 bits.
When the bits are read, the reading of the data bits is completed (S20). Next, the antenna input unit 3 checks whether or not the read data bits D0 to D5 and D6 to D11 bars match (S22). Discard.
If they match, the read data bit LFIN signal L
The sequence of FIN (H) is given as a code to the code identification unit 7a. The code identification unit 7a identifies the given code (S24), and provides the identification result to the signal processing unit 5.

FIGS. 10 and 11 are flowcharts showing the operation of the signal processing section 5 shown in FIGS. 1 and 2 when a code (identification result thereof) is given from the code identification section 7a. FIG. 12 is a flowchart illustrating the operation of the signal processing unit 5 when the encryption code included in the reset code is changed and set. FIG. 13 is a mode transition diagram of the anti-theft tag according to the present invention from the reset mode of the VSN mode, VSO mode, WTN mode or WTO mode to the reset mode of the VSN mode, VSO mode, WTN mode or WTO mode. . FIG. 14 is a mode transition diagram (a) of the anti-theft tag according to the present invention from the reset mode of the VSN mode or the VSO mode to the reset mode of the VSN mode.
It is a mode transition diagram (b) from the reset mode of TO mode to the reset mode of WTN mode.

FIG. 15 shows the anti-theft tag according to the present invention.
From the reset mode of VSN mode or VSO mode,
Mode transition diagram of VSO mode to reset mode (a)
FIG. 9B is a mode transition diagram (b) from the reset mode of the WTN mode or the WTO mode to the reset mode of the WTO mode. 16, 17, 18, and 19
Are VSN mode, VSO mode, WTN mode and W
It is each mode transition diagram from each reset mode of TO mode.

The operation of the signal processing unit 5 will be described below based on these flowcharts and mode transition diagrams. The signal processing unit 5 reads (the identification result of) the code from the code identification unit 7a (S30), and the code is the alarm input code (S32), and if the anti-theft tag is in the set mode (S52). , And accepts this alarm input code (FIG. 16S108, FIG. 17S126, FIG. 18S146,
19S164), the anti-theft tag is set to the alert mode (FIGS. 16S110, 17S128, 18S1).
48, FIG. 19S166). If the anti-theft tag is not in the set mode (S52), the signal processing unit 5 ignores the alarm input code.

The signal processing unit 5 determines that the code from the code identification unit 7a is a set code (S34) and that the anti-theft tag is in the set mode or the reset mode (S5).
4), accept this set code (S10 in FIG. 16)
0, FIG. 17S118, FIG. 18S138, FIG. 19S15
6). If the anti-theft tag is not in the set mode or the reset mode (S54), the set code is ignored.

The signal processing unit 5 determines that the code from the code identification unit 7a is a reset code (S36) and that the anti-theft tag is in the set mode or the alarm mode (S5).
6), and accept this reset code (S11 in FIG. 16).
4, FIG. 17S132, FIG. 18S152, FIG. 19S17
0). If the anti-theft tag is not in the set mode or the alarm mode (S56), the reset code is ignored. If the anti-theft tag is not in the reset mode (S38), the signal processing unit 5 outputs another encryption change code, V
The SN setting code, the VSO setting code, the WTN setting code, the WTO setting code, the second operation code, and the first operation code are ignored.

If the anti-theft tag is in the reset mode (S38) and the code from code identification unit 7a is an encryption change code (S39), signal processing unit 5 accepts this encryption change code (S41 in FIG. 12). . The signal processing unit 5 determines that the anti-theft tag is in the reset mode (S3
8) If the code from the code identification unit 7a is the VSN setting code (S40), the VSN setting code is accepted (S60 in FIG. 13). The signal processing unit 5 determines that the anti-theft tag is in the reset mode (S38) and the code from the code identification unit 7a is a VSO setting code (S4).
2), accept this VSO setting code (S6 in FIG. 13)
6).

If the anti-theft tag is in the reset mode (S38) and the code from the code identification unit 7a is a WTN setting code (S44), the signal processing unit 5 sets the W
The TN setting code is received (S72 in FIG. 13). If the anti-theft tag is in the reset mode (S38) and the code from the code identification unit 7a is a WTO setting code (S46), the signal processing unit 5 accepts the WTO setting code (S78 in FIG. 13).

If the anti-theft tag is in the reset mode (S38) and the code from the code identification section 7a is the second operation code (S48), the signal processing section 5 sets the second
The operation code is received (S84, S88 in FIG. 14). If the anti-theft tag is in the reset mode (S38) and the code from the code identification unit 7a is the first operation code (S50), the signal processing unit 5 accepts the first operation code (S92, S96 in FIG. 15). ).

The signal processing unit 5 determines that the anti-theft tag is VS
When the reset mode is any of the N mode, the VSO mode, the WTN mode, and the WTO mode (S6 in FIG. 12)
4, S70, S76, S82), when the encryption change code is received (S41 in FIG. 12), the drive unit 8 outputs an encryption code change confirmation signal (S43 in FIG. 12), and the encryption stored in the encryption code storage unit 9 is performed. The code is changed to the new encryption code included in the encryption change code (S4 in FIG. 12).
5). At this time, the mode of the anti-theft tag does not change (S64, S70, S76, S82 in FIG. 12).

The signal processing unit 5 determines that the anti-theft tag is VS
N mode, VSO mode, WTN mode, or WTO mode (S6 in FIG. 13)
4, S70, S76, S82), VSN setting code, V
When any of the SO setting code, the WTN setting code and the WTO setting code is received (S60, S66, S66 in FIG. 13).
72, S78), and a driving mode setting confirmation signal is output from the drive unit 8 (FIG. 13, S62, S68, S74, FIG. 13).
S80), the mode is set to the reset mode of the setting code having received the anti-theft tag. At this time, the encryption code stored in the encryption code storage unit 9 does not change (FIG. 13S
64, S70, S76, S82).

The signal processing unit 5 determines that the anti-theft tag is VS
When the second operation code is received (S84 in FIG. 14) in one of the reset modes of the N mode and the VSO mode (S84 in FIG. 14), the drive unit 8 outputs a reset mode setting confirmation signal (S86 in FIG. 14). ),
The anti-theft tag is set to the reset mode of the VSN mode. At this time, the encryption code stored in the encryption code storage unit 9 does not change (S64 in FIG. 14).

The signal processing unit 5 determines that the anti-theft tag is WT.
When the reset mode is either the N mode or the WTO mode (S76, S82 in FIG. 14), and the second operation code is received (S88 in FIG. 14), the drive unit 8 outputs a reset mode setting confirmation signal (S90 in FIG. 14). ),
The anti-theft tag is set to the reset mode of the WTN mode. At this time, the encryption code stored in the encryption code storage unit 9 does not change (S76 in FIG. 14).

The signal processing unit 5 determines that the anti-theft tag is VS
When the first operation mode is received (S92 in FIG. 15) when the reset mode is either the N mode or the VSO mode (S64, S70 in FIG. 15), the drive unit 8 outputs a reset mode setting confirmation signal (S94 in FIG. 15). ),
The anti-theft tag is set to the reset mode of the VSO mode. At this time, the encryption code stored in the encryption code storage unit 9 does not change (S70 in FIG. 15).

The signal processing unit 5 determines that the anti-theft tag is WT.
When the first operation code is received (S96 in FIG. 15) in any one of the reset modes of the N mode and the WTO mode (S96 in FIG. 15), the drive unit 8 outputs a reset mode setting confirmation signal (S98 in FIG. 15). ),
The anti-theft tag is set to the reset mode of the WTO mode. At this time, the encryption code stored in the encryption code storage unit 9 does not change (S82 in FIG. 15).

The signal processing unit 5 determines that the anti-theft tag is VS
In the reset mode of the N mode (S64 in FIG. 16), when the set code is received (S100 in FIG. 16), if the switch VS is open (if the anti-theft tag is attached to the anti-theft object) (FIG. 16). 16S10
2), a set mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the VSN mode set mode (S104 in FIG. 16). If the switch VS is short-circuited (S102 in FIG. 16), the set code is ignored.

The signal processing unit 5 determines that the anti-theft tag is VS
This is the set mode of the N mode (S104 in FIG. 16), when the alarm input code is received (S108 in FIG. 16) or when the switch VS is short-circuited (when the anti-theft tag is removed from the anti-theft object) (FIG. 16). 16S10
6) Then, the anti-theft tag is set to the alert mode (FIG. 1).
6S110), an alarm signal is output from the drive unit 8.

The signal processing unit 5 determines that the anti-theft tag is VS
When the set mode is the N mode (S104 in FIG. 16)
Alternatively, when the reset mode is received (S114 in FIG. 16) in the alert mode (S110 in FIG. 16), it is determined whether or not the encryption code of the reset code matches the encryption code stored in the encryption code storage unit 9. When it is determined that they match (S103 in FIG. 16), the anti-theft tag is set to the reset mode of the VSN mode (FIG. 16S).
64). If it is determined that they do not match (S10 in FIG. 16)
3), the anti-theft tag is set to the warning mode (FIG. 16)
S105), and output a warning signal from the drive unit 8.

When the anti-theft tag is in the warning mode (S105 in FIG. 16), the signal processing unit 5 receives a reset code having an encryption code that matches the encryption code stored in the encryption code storage unit 9 (FIG. 16). 16S10
7, 109), the antitheft tag is set to the reset mode of the VSN mode (S64 in FIG. 16).

When the anti-theft tag is in the VSN mode set mode (S1 in FIG. 16)
04), in the alert mode (S110 in FIG. 16) or in the warning mode (S105 in FIG. 16), the switch V
When S is released and the reset switch RS is short-circuited by the key (S112 in FIG. 16), a reset mode setting confirmation signal is output from the drive unit 8 and the anti-theft tag is set to W.
Set to the reset mode of the TO mode (S8 in FIG. 16)
2).

The signal processing unit 5 determines that the anti-theft tag is VS
In the reset mode of the O mode (S70 in FIG. 17), when the set code is received (S118 in FIG. 17), if the switch VS is open (if the anti-theft tag is attached to the anti-theft object) (FIG. 17). 17S12
0), the set mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the VSO mode set mode (S122 in FIG. 17). If the switch VS is short-circuited (S120 in FIG. 17), the set code is ignored.

Further, the signal processing unit 5 indicates that the anti-theft tag is in the reset mode of the VSO mode (S7 in FIG. 17).
0), when the switch VS is opened (when the anti-theft tag is attached to the anti-theft object) (FIG. 17S)
116), the set mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the VSO mode set mode (S122 in FIG. 17).

The signal processing unit 5 determines that the anti-theft tag is VS
This is the set mode of the O mode (S122 in FIG. 17), when the alarm input code is received (S126 in FIG. 17) or when the switch VS is short-circuited (when the anti-theft tag is removed from the anti-theft object) (FIG. 17). 17S12
4) An alarm signal is output from the drive unit 8, and the anti-theft tag is set to the alert mode (S128 in FIG. 17).

The signal processing unit 5 determines that the anti-theft tag is VS
When the set mode is the O mode (S122 in FIG. 17)
Alternatively, in the alert mode (S128 in FIG. 17), when a reset code is received (S132 in FIG. 17), it is determined whether or not the encryption code of the reset code matches the encryption code stored in the encryption code storage unit 9. When it is determined that they match (S121 in FIG. 17), the anti-theft tag is set to the release mode of the VSO mode (S13 in FIG. 17).
4) The driving unit 8 outputs a release mode setting confirmation signal. Then, after 32 seconds have passed in the release mode (FIG. 17).
S136), the antitheft tag is set to the reset mode of the VSO mode (S70 in FIG. 17).

At this time, the signal processing unit 5
Is opened (if the anti-theft tag is attached to the anti-theft object) (S116 in FIG. 17), the anti-theft tag is set to the VSO mode set mode (S122 in FIG. 17), and the set mode The setting confirmation signal is output from the driving unit 8. When it is determined that they do not match (S121 in FIG. 17), the anti-theft tag is set to the warning mode (S123 in FIG. 17), and a warning signal is output from the drive unit 8.

When the anti-theft tag is in the warning mode (S123 in FIG. 17), the signal processing unit 5 receives a reset code having an encryption code that matches the encryption code stored in the encryption code storage unit 9 (FIG. 17). 17S12
5, 127), the anti-theft tag is set to the release mode of the VSO mode (S134 in FIG. 17), and the release mode setting confirmation signal is output from the drive unit 8. The process after the setting of the release mode (S134 in FIG. 17) is the same as described above.

The signal processing unit 5 determines that the anti-theft tag is VS
When the set mode is the O mode (S12 in FIG. 17)
2) When in the alert mode (S128 in FIG. 17) or in the warning mode (S123 in FIG. 17), the switch VS
Is released and the reset switch RS is short-circuited by the key (S130 in FIG. 17), the drive unit 8 outputs a reset mode setting confirmation signal, and the anti-theft tag is set to WT.
Set to reset mode of O mode (S8 in FIG. 17)
2).

The signal processing unit 5 determines that the anti-theft tag is WT.
In the reset mode of the N mode (S76 in FIG. 18), when the set code is received (S138 in FIG. 18), if the conductive wire W is connected (if the anti-theft tag is attached to the anti-theft object) ( FIG. 18S14
0), the set mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the WTN mode set mode (S142 in FIG. 18). If the conductive wire W is not connected (S140 in FIG. 18), the set code is ignored.

The signal processing unit 5 determines that the anti-theft tag is WT.
This is the set mode of the N mode (S142 in FIG. 18), when the alarm input code is received (S146 in FIG. 18) or when the conductive wire W is cut (when the anti-theft tag is removed from the anti-theft object) ( FIG. 18S14
4) An alarm signal is output from the drive unit 8, and the anti-theft tag is set to the alert mode (S148 in FIG. 18).

The signal processing unit 5 determines that the anti-theft tag is WT.
When the set mode is the N mode (S142 in FIG. 18)
Alternatively, when the reset mode is received (S152 in FIG. 18) in the alert mode (S148 in FIG. 18), it is determined whether the encryption code of the reset code matches the encryption code stored in the encryption code storage unit 9. If it is determined that they match (S141 in FIG. 18), the anti-theft tag is set to the reset mode of the WTN mode (S141 in FIG. 18).
76). When it is determined that they do not match (S14 in FIG. 18)
1) The anti-theft tag is set in the warning mode (FIG. 18).
S143), a warning signal is output from the drive unit 8.

When the anti-theft tag is in the warning mode (S143 in FIG. 18), the signal processing unit 5 receives a reset code having an encryption code that matches the encryption code stored in the encryption code storage unit 9 (see FIG. 18). 18S14
5, 147), the anti-theft tag is set to the reset mode of the WTN mode (S76 in FIG. 18).

When the anti-theft tag is in the set mode of the WTN mode (S1 in FIG. 18).
42), in the alert mode (S148 in FIG. 18) or in the warning mode (S143 in FIG. 18), the lock of the conductive wire W is released by the key, and the connection is released;
In conjunction with this, when the reset switch RS is short-circuited (S150 in FIG. 18), the anti-theft tag is set to the reset mode of the WTO mode (S82 in FIG. 18), and the drive mode 8 outputs a reset mode setting confirmation signal. .

The signal processing unit 5 determines that the anti-theft tag is WT.
In the reset mode of the O mode (S82 in FIG. 19), when the set code is received (S156 in FIG. 19), if the conductive wire W is connected (if the anti-theft tag is attached to the anti-theft object) ( FIG. 19S15
8) The set mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the WTO mode set mode (S160 in FIG. 19). If the conductive wire W is not connected (S158 in FIG. 19), the set code is ignored.

Further, the signal processing section 5 indicates that the anti-theft tag is in the reset mode of the WTO mode (S8 in FIG. 19).
2) When the conducting wire W is connected (when the anti-theft tag is attached to the anti-theft object) (FIG. 19S)
154), a set mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the WTO mode set mode (S160 in FIG. 19).

The signal processing unit 5 determines that the anti-theft tag is WT.
This is the set mode of the O mode (S160 in FIG. 19), when the alarm input code is received (S164 in FIG. 19) or when the conductive wire W is cut (when the anti-theft tag is removed from the anti-theft object) ( FIG. 19S16
2) Set the anti-theft tag to the alert mode (Fig. 1
9S166), an alarm signal is output from the drive unit 8.

The signal processing unit 5 determines that the anti-theft tag is WT.
When the set mode is the O mode (S160 in FIG. 19)
Alternatively, when the reset mode is received (S170 in FIG. 19) in the alert mode (S166 in FIG. 19), it is determined whether or not the encryption code of the reset code matches the encryption code stored in the encryption code storage unit 9. If it is determined that they match (S161 in FIG. 19), the release mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the WTO mode release mode (S17 in FIG. 19).
2) The driving unit 8 outputs a release mode setting confirmation signal. After 32 seconds have passed in the release mode (FIG. 19)
S174), the anti-theft tag is set to the reset mode of the WTO mode (S82 in FIG. 19).

At this time, the signal processing unit 5
Is connected (if the anti-theft tag is attached to the anti-theft object) (S154 in FIG. 19), the anti-theft tag is set to the set mode of the WTO mode (S160 in FIG. 19), and the The setting confirmation signal is output from the driving unit 8. When it is determined that they do not match (S161 in FIG. 19), the anti-theft tag is set to a warning mode (S163 in FIG. 19), and a warning signal is output from the driving unit 8.

When the anti-theft tag is in the warning mode (S163 in FIG. 19), the signal processing unit 5 receives a reset code having an encryption code that matches the encryption code stored in the encryption code storage unit 9 (see FIG. 19). 19S16
5, 167), the anti-theft tag is set to the release mode of the WTO mode (S172 in FIG. 19), and the release mode setting confirmation signal is output from the drive unit 8. The setting after the release mode is set (S172 in FIG. 19) is the same as that described above.

The signal processing unit 5 determines that the anti-theft tag is WT.
When the set mode is the O mode (S16 in FIG. 19)
0), when in the alert mode (S166 in FIG. 20) or in the warning mode (S163 in FIG. 19), the lock of the conductive wire W is released by the key and the connection is released, and in conjunction with that, the reset switch RS is activated. When short-circuited,
A reset mode setting confirmation signal is output from the drive unit 8, and the anti-theft tag is set to the release mode of the WTO mode (S82 in FIG. 19). In the above-described embodiment of the present invention, a radio signal is used.
It goes without saying that signals that can be transmitted and received without contact, such as ultrasonic waves, can also be used.

[0118]

According to the anti-theft tag of the first invention of the present invention, a different reset code can be set for each store, and the theft can be more reliably prevented.

According to the anti-theft tag according to the second aspect of the present invention, even if an attempt is made to reset using, for example, an instruction signal transmitting device stolen from another store, the tag is immediately exposed. Also,
Since it is difficult to know the reset code by mistake, theft can be more reliably prevented.

According to the anti-theft tag of the third invention, the reset code can be easily changed even if the instruction signal transmitting device is stolen or the reset code is known.
Theft can be more reliably prevented.

According to the instruction signal transmitting device according to the fourth aspect of the invention, a different release instruction signal can be transmitted for each store, and theft can be more reliably prevented.

According to the instruction signal transmitting device of the fifth invention, it is possible to prevent the instruction signal transmitting device itself from being stolen or taken out of the store without permission.

According to the parent instruction signal transmitting device of the sixth invention, even if the instruction signal transmitting device for transmitting the release instruction signal is stolen or the encryption code of the release instruction signal is known,
The encryption code can be easily changed, and theft can be more reliably prevented.

According to the instruction signal transmitting device according to the seventh aspect of the present invention, even if another instruction signal transmitting device that transmits the release instruction signal is stolen or the encryption code of the release instruction signal is known, the encryption code is transmitted. It can be easily changed, and theft can be more reliably prevented.

According to the anti-theft device according to the eighth invention, a reset code of the anti-theft tag different for each store can be set, and the theft can be more reliably prevented.

According to the anti-theft device of the ninth invention, even if the instruction signal transmitting device is stolen or the encryption code of the release instruction signal is known, the encryption code can be easily changed.
Theft can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of an example of an embodiment of an anti-theft tag according to the present invention.

FIG. 2 is a block diagram showing a main part configuration of another example of the embodiment of the anti-theft tag according to the present invention.

FIG. 3 is a block diagram showing a configuration of a master remote control key.

FIG. 4 is a block diagram showing a configuration of a remote control key.

FIG. 5 is an explanatory diagram illustrating a configuration example of a master remote control key and a code signal transmitted by the remote control key.

FIG. 6 is an explanatory diagram for describing a configuration example of a master remote control key and a code signal transmitted by the remote control key.

FIG. 7 is a table showing examples of master remote control keys and data codes transmitted by the remote control keys.

FIG. 8 is a conceptual diagram showing a configuration example of a main part of an embodiment of an anti-theft device according to the present invention.

FIG. 9 is a flowchart illustrating operations of an antenna input unit and a code identification unit.

FIG. 10 is a flowchart illustrating an operation of the signal processing unit when a code is given from the code identification unit.

FIG. 11 is a flowchart illustrating an operation of the signal processing unit when a code is supplied from the code identification unit.

FIG. 12 is a flowchart illustrating an operation of the signal processing unit when the encryption code included in the reset code is changed and set.

FIG. 13 is a mode transition diagram of the anti-theft tag according to the present invention.

FIG. 14 is a mode transition diagram of the anti-theft tag according to the present invention.

FIG. 15 is a mode transition diagram of the anti-theft tag according to the present invention.

FIG. 16 is a mode transition diagram of the anti-theft tag according to the present invention.

FIG. 17 is a mode transition diagram of the anti-theft tag according to the present invention.

FIG. 18 is a mode transition diagram of the anti-theft tag according to the present invention.

FIG. 19 is a mode transition diagram of the anti-theft tag according to the present invention.

FIG. 20 is a circuit diagram showing a main configuration of the anti-theft tag.

[Description of Signs] 1 IC 2 Reset input unit 3 Antenna input unit (receiving means for anti-theft tag) 4 Input unit (detecting means) 5 Signal processing unit (matching determining means, canceling means) 7a Code identifying unit (identifying means) Reference Signs List 8 drive unit (alarm output unit) 9 encryption code storage unit (encryption storage unit of anti-theft tag) 10 (4-bit) microcomputer (encryption storage unit) 13 LC resonance circuit (transmission unit) 14 LC resonance circuit (reception unit) CRB encryption change button CRS encryption switch LED light emitting diode (alarm output means) BUZ buzzer (alarm output means) MRK master remote control key (parent instruction signal transmission device) RK remote control key (instruction signal transmission device) RS reset switch RSB reset button VS switch W Conduction wire C2, L1, R2 Resonant circuit (theft prevention Stop tag receiving means) T Anti-theft tag TX transmitter TRK Tabletop master remote control key

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Patent Publication No. 3-45436 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 13/22-13/26

Claims (9)

(57) [Claims] 1. A detecting means for detecting an attached state and a detached state with respect to an anti-theft object, a receiving means for receiving a signal in a non-contact manner, and when the detecting means detects the detached state and when the receiving means detects a predetermined signal. And an alarm output means for outputting an alarm when receiving the alarm code, wherein the receiving means includes an encryption code for instructing that the alarm output means is operable and canceling the alarm output state. While receiving the release instruction signal, the identification means for identifying the predetermined signal and the release instruction signal received by the receiving means, an encryption storage means for storing an encryption code in advance, and the identification means Coincidence determining means for determining whether or not the encryption code included in the identified release instruction signal and the encryption code stored in the encryption storage means match; When it is determined that the constant section coincide, anti-theft tags said alarm output means is characterized by comprising a releasing means for releasing the status and alarm output state is ready. 2. The anti-theft tag according to claim 1, further comprising a warning output unit that outputs a warning when the match determination unit determines that there is no match. 3. The cryptographic storage means updates its storage contents to the new cryptographic code in response to a cryptographic change instruction signal received by the receiving means and instructing a change to a new cryptographic code. Anti-theft tag. 4. An encryption storage means for storing an encryption code to be included in a release instruction signal to be received by a receiving means provided in the anti-theft tag according to claim 1; Transmitting means for transmitting including the encryption code stored in the encryption storage means. 5. The instruction signal transmitting apparatus according to claim 4, further comprising: a receiving unit that receives a signal in a non-contact manner; and an alarm output unit that outputs an alarm when the receiving unit receives a predetermined signal. 6. An encryption setting means for setting a new encryption code to be stored in the encryption storage means provided in the anti-theft tag according to claim 3, and an encryption change instruction signal to be received by the reception means provided in the anti-theft tag, Transmitting means for transmitting a new encryption code including the new encryption code set by the encryption setting means. 7. A receiving means for receiving an encryption change instruction signal transmitted by the parent instruction signal transmitting device according to claim 6, wherein the encryption storage means includes a new encryption change instruction signal included in the encryption change instruction signal received by the receiving means. The instruction signal transmitting device according to claim 4 or 5, wherein the storage content is updated by the encryption code. 8. The anti-theft tag according to claim 1 or 2,
An anti-theft device comprising: a transmitting device that transmits a predetermined signal to be received by a receiving means of the anti-theft tag; and the instruction signal transmitting device according to claim 4. 9. The anti-theft tag according to claim 3, a transmitting device for transmitting a predetermined signal to be received by a receiving means provided in the anti-theft tag, a parent instruction signal transmitting device according to claim 6,
An anti-theft device comprising the instruction signal transmitting device according to claim 7.