JPH0850687A - Burglarproof device - Google Patents

Abstract

PURPOSE:To improve the operation reliability of the burglar proof device by preventing a preparatory action of theft from being erroneously detected regardless of non-execution of the preparatory action of theft in the case that a light shock or oscillation is applied to the enclosure or a noise radio wave is put on an antenna for a short time. CONSTITUTION:An enclosure 2 attached to the object which should be prevented from being stolen is provided with a preparatory action detecting means SD which detects a preparatory action of theft, end an alarm output means AO which outputs alarm information based on detection information of the preparatory action detecting means SD is provided in the enclosure 2; and only when theft preparatory action detection information outputted by the preparatory action detecting means SD continues for a set time or longer, a check means H makes the alarm output means AO output the alarm information. The preparatory action detecting means SD consists of an attaching tool 3 with which the enclosure is attached to the object which should be prevented from being stolen, a switch SW which detects detachment of this tool 3 from the enclosure 2 as a preparatory action and an antenna 22 which receives the radio wave from a transmitter on the outside which is installed at an entrance/exit, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a preliminary action detecting means for detecting a preliminary action of theft in a casing attached to an antitheft object, and the preliminary action detecting means inside the casing. The present invention relates to an anti-theft device provided with alarm output means for outputting alarm information based on the detection information of the above.

[0002]

2. Description of the Related Art Such an anti-theft device is used by being attached to an anti-theft object such as a product displayed in a store, and the case of the anti-theft device is illegally removed from the anti-theft object, or When a preliminary act of theft such as illegally taking out the antitheft object with the case of the antitheft device attached is taken out of the store, it is detected by the preliminary action detection means, and based on it The alarm output means outputs the alarm information to warn the store employee or the like that the above-mentioned preliminary act of theft has been carried out and prevent loss due to the theft.

In order to detect the above-mentioned preparatory action, for example, an attachment made of a conductive wire or the like connected to the casing with pins at both ends is used to prevent the theft of the casing of the antitheft device. The anti-theft device was illegally removed from the anti-theft object while it was attached to the object and the circuit inside the housing detected that the wire was cut or the pins at both ends were disconnected from the connection part of the housing. To detect that
An antenna for receiving radio waves is built in the housing, and for example, by receiving radio waves from a transmitter installed at the entrance of a store and giving an alarm, the anti-theft object with the anti-theft device installed is illegal I was trying to detect that it was taken out of the store.

[0004]

However, in the above-mentioned prior art, since the disconnection of the wire and the disconnection with the housing are finally detected by the opening / closing operation of the mechanical contact (switch), for example, Even when a so-called chattering phenomenon occurs in which the above contacts are intermittently turned on and off in a short time due to a slight shock or vibration applied to the housing, it is erroneously detected that the act was performed even though no preliminary theft action has been taken.
In addition, even if noise radio waves enter the antenna for a short period of time, there is a possibility that it may be erroneously detected as a preparatory activity for theft, and improvement is desired.

The present invention has been made in view of the above circumstances, and an object thereof is erroneously when a light shock or vibration is applied to the housing, or when a noise electric wave is put on the antenna for a short time. By not detecting theft theft,
It is to improve the operational reliability of the anti-theft device.

[0006]

The anti-theft device of the present invention is provided with a preliminary act detecting means for detecting a preliminary act of theft in a case attached to an anti-theft object, and is provided inside the case. An alarm output means for outputting alarm information based on the detection information of the preliminary action detection means is provided, and the first characteristic configuration thereof is the theft preliminary action detection output by the preliminary action detection means. Only when the information continues for a set time or longer, a check means for outputting the alarm information by the alarm output means is provided.

A second characteristic configuration is the same as the first characteristic configuration, wherein the preliminary action detecting means is connected to the casing for attaching the casing to an antitheft object,
An attachment / detachment detection switch for electrically detecting attachment / detachment of the attachment to / from the housing, wherein the alarm output means is a detachment detection signal of the attachment / detachment detection switch as the theft preliminary action detection information. It is configured to output alarm information based on the above.

A third characteristic structure is the antenna according to the first or second characteristic structure, wherein the preliminary action detecting means is provided in the housing and receives an electric wave from a transmitter installed at a specific location. The alarm output means is configured to output alarm information based on a received signal of the antenna as theft preliminary action detection information.

[0009]

According to the first characteristic configuration of the present invention, when the theft preliminary action detection information output by the preliminary action detection means continues for a set time or longer, the alarm output means outputs the alarm information. When the above-mentioned theft preliminary action detection information is less than or equal to the set time, such as when the preliminary action detection means outputs due to the external disturbance, the alarm information is not output.

According to the second characteristic configuration, the attachment such as a wire connected to the casing for attaching the casing to the anti-theft object is detached or cut off from the connection portion and the casing is removed. When the attachment / detachment detection switch is detached from the housing, the attachment / detachment detection switch detects that the attachment is detached from the housing as a theft preliminary action. When the disconnection detection signal continues for a set time or longer, alarm information is output by the alarm output means. However, for example, a light shock or vibration is applied to the housing, and the contact of the attachment / detachment detection switch is interrupted in a short time. When the departure detection signal is equal to or less than the set time, as in the case of “Yes”, no alarm information is output.

Further, according to the third characteristic configuration, when the antenna provided in the housing receives a radio wave from a transmitter installed at a specific location such as an entrance / exit, the received signal is used as the theft anti-theft detection information. To be detected. Then, when the received signal continues for a set time or longer, the alarm output means outputs the alarm information. However, such as when a short time noise electric wave is put on the antenna, the received signal is below the set time. When, the alarm information is not output.

[0012]

According to the first characteristic configuration of the present invention, it is possible to prevent an erroneous alarm that a preliminary theft has been performed due to various disturbances and the like, even though the preliminary theft has not been performed. The operation reliability of the anti-theft device can be improved.

Further, according to the second characteristic configuration, the case is attached to the anti-theft object by a fitting such as a wire, and the anti-theft apparatus detects the preliminary anti-theft action by detaching the fitting from the case. In the above, it is possible to prevent an erroneous alarm that a preliminary act of theft has been caused by a disturbance, and thus it is possible to obtain a suitable means for implementing the first characteristic configuration.

According to the third characteristic configuration, the antenna built in the housing receives the radio waves from the transmitter installed at the entrance or the like, so that the antitheft device is attached to the antitheft device. In the anti-theft device that detects a preliminary theft attempt to bring out the device, it will not be erroneously alarmed that there is a preliminary theft act due to noise radio waves or the like. Therefore, when implementing the first or second characteristic configuration described above. Can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the antitheft device of the present invention will be described below with reference to the drawings. The plan view and FIG. 1 of FIG.
As shown in the side view of (b), a sensor tag 1 serving as an anti-theft device has a rectangular parallelepiped casing 2 attached to a product or the like which is an anti-theft object, and the casing 2 as the anti-theft object. The wire unit 3 functions as a fixture connected to the housing 2 for attachment. As shown in FIG. 3, the wire unit 3 includes lock pins 30 provided at both ends for inserting and removing in the housing 2, and both lock pins 3
A wire 31 for electrically connecting between 0 and a jacket 3 for covering the entire wire 31 and a part of the lock pin 30.
Consists of two.

The lock pin 30 and the wire 31 are made of metal and have conductivity, and in the vicinity of the tip of the lock pin 30,
An engagement recess 30a is formed to prevent the lock pin 30 from coming off the housing 2. When the lock pin 30 is inserted into the housing 2, the end portion of the outer cover 32 covering the lock pin 30 is retracted into the housing 2 and the lock pin 30 is exposed to the outside as shown in FIG. I try not to. As a result, it is possible to prevent the lock pin 30 from contacting another object charged with static electricity and damaging the electric circuit in the housing 2.

Inside the housing 2, as shown in FIG. 2, the following circuits are provided. That is, the LED lamp 20,
A piezoelectric buzzer 21, a resonance antenna 22 including a coil and a capacitor, an antenna input circuit 23 that outputs a reception signal when the resonance antenna 22 is in a reception state, and a wire disconnection signal when the wire unit 3 is not properly connected Wire input circuit 24, antenna input circuit 2
3, a switching circuit 25 that outputs a control signal when a reception signal from 3 or a wire cutting signal from the wire input circuit 24 is input, and an oscillation circuit 26 that starts pulse oscillation when a control signal from the switching circuit 25 is input, a switching circuit When the control signal from 25 is input, the oscillation circuit 26
When the count completion signal of the counter 27 is input, the switching circuit 25 receives the reception signal or the wire disconnection signal. Latch circuit 28 and counter 27 for maintaining
When the count completion signal is input, the LED lamp 20 is turned on and the piezoelectric buzzer 21 is operated.
The D driver 29, the battery V that supplies electric power to each circuit in the housing 2, and the negative electrode of the battery and the ground of each circuit are connected as the wire unit 3 is inserted into the housing 2 A power supply holding circuit VK or the like is provided which starts power supply to each circuit and, after power supply is once started, maintains power supply unless the reset switch R is closed.

In the circuit having the above-described structure, when the wire unit 3 is cut while the housing 2 is attached to the product or the like which is the anti-theft object by the wire unit 3, or when the sensor tag 1 is installed in, for example, a store. The piezoelectric buzzer 21 housed in the housing 2 sounds when a pair of panel-shaped transmitters O as shown in FIG. It is configured to output. As the oscillator O, one of the pair of panel-shaped ones described above may be installed on one side of the doorway, or may be installed on the floor surface of the doorway.

The process until the piezoelectric buzzer 21 starts to sound in the above case will be described below. First, when the wire unit 3 and the housing 2 are not connected in series due to disconnection of the wire unit 3 or the like, a pair of electrode parts t, t into which both lock pins 30 of the wire unit 3 are inserted.
The input-side terminal of the wire input circuit 24 connected to one of the two rises from the ground potential. The other of the pair of electrode parts t, t is connected to the ground. The wire input circuit 24 detects that the wire unit 3 has been disconnected, etc., when the input-side terminal reaches a set potential or higher. As a result, the pair of electrode parts t, t constitutes an attachment / detachment detection switch SW for detecting attachment / detachment of the wire unit 3 to / from the housing 2. And the wire input circuit 2
When detecting the disconnection of the wire unit 3, the wire 4 outputs a wire disconnection signal to the switching circuit 25.

The switching circuit 25 sends a control signal to the oscillation circuit 26 and the counter 27 while receiving the wire cutting signal from the wire input circuit 24, and the oscillation circuit 26 oscillates a pulse while receiving the control signal. The counter 27 counts the number of oscillation pulses of the oscillation circuit 26.
When the control signal stops, the oscillation circuit 26 stops pulse oscillation, the counter 27 stops counting, and resets the pulse count number. The counter 27 sends one pulse signal as a count completion signal to the latch circuit 28 and the buzzer / LED driver 29 each time the preset number of pulses is counted. Buzzer L
While receiving the count completion signal, the ED driver 29 causes the piezoelectric buzzer 21 to sound and the LED lamp 20 to emit light. That is, in synchronization with the count completion signal of the counter 27, the piezoelectric buzzer 21 is operated so as to make an intermittent sound, and the LED lamp 20 blinks.

On the other hand, when the latch circuit 28 receives the count completion signal of the counter 27, it maintains the switching circuit 25 in the state of receiving the disconnection signal, and the switching circuit 25 continues to send the control signal to the oscillation circuit 26 and the counter 27. . As a result, once the counter 27 has sent the count completion signal, the switching circuit 25 continues to send the control signal regardless of the presence or absence of the disconnection signal from the wire input circuit 24, and the reset switch R is closed. Until the piezoelectric buzzer 21 and the LED lamp 2
The operation of 0 continues.

As described above, when the LED lamp 20 and the piezoelectric buzzer 21 give an alarm, a shock is applied to the housing 2 so that the positive electrode or the negative electrode of the battery V is instantaneously discharged from the connection terminal. In order to prevent the circuit inside the housing 2 from being reset and the alarm being stopped, the power supply capacitor C1 for auxiliary supply of the current is connected to the battery V in order to prevent the alarm from being stopped. It is provided in parallel.

Further, when the sensor tag 1 passes through the place where the oscillator O is installed, the resonance antenna 22 generates an electromotive force by the radio wave from the oscillator O, and the antenna input circuit 23 detects the electromotive force, The reception signal is output to the switching circuit 25. That is, the resonance antenna 22 is provided in the housing 2 and functions as an antenna that receives the radio wave from the transmitter O. The operation of each circuit after the switching circuit 25 receives the reception signal is the same as when the wire unit 3 is disconnected, and the description thereof will be omitted.

From the above, the wire unit 3, the attachment / detachment detection switch SW, the resonance antenna 22, the antenna input circuit 2
3 and the wire input circuit 24 and the like cut the wire unit 3 to illicitly remove the sensor tag 1 from the anti-theft object, or to take the anti-theft object to which the sensor tag 1 is attached out of the store. The switching circuit 25, the oscillation circuit 26, the counter 27, and the latch circuit 2 function as preliminary action detection means SD for detecting a physical action.
8, the buzzer / LED driver 29, the LED lamp 20, the piezoelectric buzzer 21, and the like function as an alarm output unit AO that outputs alarm information by light and sound based on the detection information of the preliminary action detection unit SD. In other words, the preliminary action detection means SD is configured to include the wire unit 3 and the attachment / detachment detection switch SW, and the alarm output means A is provided.
O is configured to output alarm information based on the detachment detection signal of the attachment / detachment detection switch SW as the theft preliminary action detection information, and the preliminary action detection means SD is provided with the resonance antenna 22. At the same time, the alarm output means AO is configured to output the alarm information based on the received signal of the resonance antenna 22 as the theft preliminary action detection information.

Further, the input side terminal of the wire input circuit 24 is connected to the ground via the delay capacitor C2, whereby vibration is applied to the wire unit 3, and the electrode portion t, Even if the contact between the wire unit 3 such as t and the lock pin 30 and the circuit in the housing 2 is intermittently operated in a short time, the potential of the input side of the wire input circuit 24 is prevented from rapidly increasing, The wire input circuit 24 is prevented from malfunctioning even though the wire unit 3 is not cut. At the same time, in the operation of the oscillator circuit 26 and the counter 27, the counter 27 counts the set number of pulses from the oscillator circuit 26 and outputs the first count completion signal after the switching circuit 25 receives the disconnection signal. Otherwise, the buzzer / LED driver 29 does not start the operation of the piezoelectric buzzer 21 and the LED lamp 20, so that the detachment detection signal of the attachment / detachment detection switch SW or the antenna reception signal due to wire cutting or the like does not continue for a certain time or longer. Is the piezoelectric buzzer 21 and L
The ED lamp 20 does not operate, thereby preventing malfunction due to noise or the like.

Therefore, the alarm output means AO outputs the alarm only when the anti-theft activity detection information (the departure detection signal and the antenna reception signal) output by the auxiliary activity detection means SD continues for a set time or longer. The restraint means H for outputting information includes the delay capacitor C2 and the transmission circuit 26.
And the counter 27.

Next, the mounting structure of the wire unit 3 to the housing 2 will be described. As shown in FIGS. 3 to 7, the wire unit 3 includes the lock pin 30 of the wire unit 3.
Is a jack unit 4 provided in contact with the inner wall of the housing 2.
The two lock pin insertion holes 40a and 40b are attached to the housing 2. The jack unit 4 has a lock pin 3 inserted into the lock pin insertion hole 40a.
A hook-shaped lock spring 41 that engages with 0 to prevent it from coming off,
A hook-shaped lock spring 42 that engages with the lock pin 30 inserted into the lock pin insertion hole 40b to prevent the lock pin from coming off is provided side by side.

The lock springs 41 and 42 are provided at their bent portions 4
At 1c and 42c, the spring locking projections 49 projecting from the main body of the jack unit 4 are locked. Ends 41b, 42b of the lock springs 41, 42 farther from the bent portions 41c, 42c and the bent portions 41c, 42c.
As will be described later, convex portions 41a and 42a that engage with the engaging concave portion 30a of the lock pin 30 are provided in an intermediate portion between and in such a state that the convex portions 41a and 42a can move in and out of the lock pin insertion holes 40a and 40b.

Further, since the lock springs 41 and 42 are made of metal and are formed in a hook shape, they have elasticity in a direction in which both ends approach or separate, and in a state where no force is applied to the lock springs 41 and 42. , As shown in FIG.
42a is in a state in which the lock pin insertion holes 40a and 40b are projected almost to the center. Therefore, the lock pin 30
When the engaging concave portion 30a and the convex portions 41a and 42a are engaged with each other, the convex portions 41a and 42a are engaged with the lock pin insertion hole 40a.
The lock springs 41 and 42 are urged toward the engagement side with the lock pin 30 by being pushed in the direction of retreating from 40b.

The lock pin insertion holes 40a, 40b are closed on the inner side, and one end is fixed to the inner ends of the lock pin insertion holes 40a, 40b.
4a and 44b are provided respectively. The metal coil springs 44a, 44b are provided with lock pin insertion holes 40a,
The lock pin 30 inserted in 40b is urged toward the disengagement side, and is in contact with the metal conduction terminals 48a and 48b at the end portion on the fixed side.

As shown in FIG. 9, one end of the conduction terminal 48b projects into the end of the lock pin insertion hole 40b on the inner side and contacts the coil spring 44b, and the other end thereof is shown in FIG. It is in contact with the electrode surface 6a formed on the circuit board 6 forming the circuit. The conduction terminal 48a also has a configuration similar to that of the conduction terminal 48b, although the connection position to the circuit board 6 is different. As a result, the lock pin 30 inserted into the lock pin insertion holes 40a, 40b is electrically connected to the circuit shown in FIG. 2 via the coil springs 44a, 44b and the conduction terminals 48a, 48b.

A key insertion hole 45, which is an insertion hole for a release operation, is formed at a position of the lock pin insertion hole 40a opposite to the lock pin insertion hole 40b, from the outer surface of the housing 2 toward the inside of the housing. The rack portion 63 of the engagement releasing key K described later is inserted into the key insertion hole 45. FIG.
0, FIG. 11, which is a partial cross-sectional view taken along the line PP ′ of FIG. 10.
Further, as shown in FIG. 12 in which the key insertion hole 45 is viewed from the outside, the key insertion hole 45 is rotated in accordance with the insertion of the engagement releasing key K into the key insertion hole 45 of the rack portion 63. Pinion gear 46 and reset switch R shown in FIG.
Pair of reset terminals 47a, 47 which are a part of
b is provided, and the key insertion hole 4 is provided from the side wall of the key insertion hole 45.
5 two shielding walls 45a, 4 which are protrusions protruding inward
5b are formed at different positions in the longitudinal direction of the key insertion holes 45 on the entrance side and the back side.

The pinion gear 46 is rotatably supported on the main body of the jack unit 4 so that the extending direction of its teeth is perpendicular to the inserting direction of the rack portion 63 of the engagement releasing key K, and 3 to 7, it is supported so that it can be moved a little in the direction perpendicular to the paper surface, and the key insertion port 4
In a state in which the rack portion 63 of the disengagement key K is not inserted in the key 5, it is located on the inner side of the key insertion opening 45 as shown in FIG. 10 and does not mesh with the rack portion 5a of the slider 5 described later. , The rack portion 6 of the disengagement key K in the key insertion opening 45
In the state in which 3 is inserted, it is pushed up by the rack portion 63, and a part thereof projects to the outside of the jack unit 4 and meshes with the rack portion 5 a of the slider 5.

A pair of reset terminals 47a, 47
b is provided on both sides of the shield wall 45b on the far side of the two shield walls 45a and 45b so as to be exposed in the key insertion hole 45, and as shown in FIG. 2 are also exposed to the outside, and at their exposed portions, they are in contact with the electrode surfaces 6b formed on the circuit board 6 and are connected to the circuit shown in FIG. Two shield walls 45
The entrance-side shielding wall 45a of the a and 45b is a ridge extending from the entrance-side end of the key insertion hole 45 toward the rear side in the longitudinal direction of the key insertion hole 45, specifically, a plate in an upright posture. It is formed as a body. The shield wall 45b on the back side is formed as a substantially L-shaped plate-like body as shown in FIG. 10, and in the portion formed on the side surface of the key insertion hole 45 when viewed in the longitudinal direction, the shield wall on the inlet side is formed. Similar to 45a, it is a ridge extending in the longitudinal direction of the key insertion hole 45.

Shield wall 45a on the entrance side and shield wall 45 on the back side
As shown in FIG. 12, the b is virtually the center of the key insertion hole 45 in the longitudinal direction as the center of the circle, and the position on the inner wall portion of the key insertion hole 45 in the longitudinal direction is defined as When the phase is represented by a virtual circle, the phases are different by 180 degrees. The shield wall 45b on the back side is located between the pair of reset terminals 47a, 47b over the entire area where the pair of reset terminals 47a, 47b are exposed in the key insertion hole 45, and is shielded. The height of the wall 45b from the wall surface of the key insertion hole 45 is higher than the height of the pair of reset terminals 47a and 47b from the wall surface of the key insertion hole 45.

A pair of reset terminals 47a, 47
When b is short-circuited, the reset switch R in the circuit shown in FIG. 2 is closed and the power supply from the battery V to each circuit is stopped. Therefore, the shield wall 45b is formed as described above, and a pair of resets is performed. The terminals 47a and 47b are prevented from being easily short-circuited by the insertion of a conductive foreign substance.

A slider 5 having a rack portion 5a which meshes with the pinion gear 46 of the jack unit 4 in a state shown in FIG.
Is provided. The slider 5 is slidably engaged with a guide portion (not shown) provided on the inner wall of the housing 2, and is in the direction indicated by arrow A in FIG. 3, that is, the insertion / removal direction of the rack portion 63 of the engagement releasing key K. It is slidable and is biased to return to the inside of the case. As shown in FIGS. 3 to 7, the slider 5 has a first pressing portion 5d that abuts on an end portion 41b of the lock spring 41 and an end portion 42 of the lock spring 42 as the slider 5 slides.
The second pressing portion 5e that abuts b is formed, and the distance between the end portion 42b of the lock spring 42 and the second pressing portion 5e is larger than the distance between the end portion 41b of the lock spring 41 and the first pressing portion 5d. It's made longer.

The disengagement key K has the outer shape shown in FIG. 13 (a), and as shown in FIG. 13 (b) and FIG. 13 (c), is arranged in the longitudinal direction with respect to the outer sleeve 61. When the inner sleeve 60, which is relatively movable and is biased to return in the separating direction, is retracted into the outer sleeve 61, the rack portion 63 fixedly connected to the outer sleeve 61 appears. The tip of the rack 63 is
It slightly protrudes from the tip of the inner sleeve 60,
The insertion operation of the rack portion 63 into the key insertion hole 45 is facilitated. The retractable amount of the inner sleeve 60 into the outer sleeve 61 is the state shown in FIG. 13B when the adjustment cap 62 is tightened with respect to the outer sleeve 61.
It is possible to change the setting in two steps between the state in which the adjustment cap 62 is loosened with respect to the outer sleeve 61 and the state shown in FIG. 13C, and the state in which the adjustment cap 62 is tightened shown in FIG. The possible amount is reduced.

Since the outer diameter of the tip of the inner sleeve 60 is made larger than the diameter of the entrance of the key insertion hole 45, when the rack portion 63 is inserted into the key insertion hole 45, the tip of the inner sleeve 60 is inserted into the jack unit 4. Then, the inner sleeve 60 is immersed in the outer sleeve 61. When this amount of immersion reaches the amount of immersion that can be set as described above, the rack portion 63 cannot be inserted any further, thereby restricting the insertion amount of the rack portion 63 into the key insertion hole 45. Is there. Therefore, the rack portion 6
The insertion amount of No. 3 into the key insertion hole 45 can be adjusted in two steps by operating the adjustment cap 62 described above.

The rack portion 63 has a long groove 63a on the rack forming surface side, as shown in FIG. 14A when the rack portion 63 is viewed from the front end side and FIG. 14B which is a partial side sectional view of the rack portion 63. And a specific shape having two recessed grooves, namely, a short groove 63b on the side opposite to the rack forming surface. The cross-sectional shapes of the long groove 63a and the short groove 63b as viewed in the longitudinal direction are substantially the same as the cross-sectional shapes of the entrance-side shield wall 45a and the back-side shield wall 45b formed in the key insertion hole 45 shown in FIG. They coincide with each other, and the shielding wall 45a on the entrance side has the long groove 6
3a, the back side shielding wall 45b is engaged with the short groove 63b, so that the rack portion 63 of the engagement releasing key K is
The rack portion 63 can be inserted into the key insertion hole 45 without being blocked by the shielding walls 45a and 45b.

Therefore, the two shielding walls 45a and 45b are
It functions as an insertion preventing means IS that allows the rack portion 63 configured to have a specific shape to be inserted into the key insertion hole 45 and prevents insertion of a false operation tool having a shape other than the specific shape into the key insertion hole 45. Since the long groove 63a of the rack portion 63 corresponds to the shield wall 45a on the inlet side of the key insertion hole 45, the length of the groove corresponds to the shield wall 45b on the rear side.
It is longer than b.

Next, the engagement and disengagement of the wire unit 3 and the housing 2 will be described. First, when the wire unit 3 and the housing 2 are engaged with each other, the lock pins 30 of the wire unit 3 shown in FIG. One of them is inserted into the lock pin insertion hole 40b of the jack unit 4. When the lock pin 30 is inserted against the biasing force of the coil spring 44b provided in the lock pin insertion hole 40b, the lock spring 4 is inserted into the engaging recess 30a of the lock pin 30.
The convex portion 42a protruding into the lock pin insertion hole 40b of No. 2 is engaged, and the lock pin 30 is reliably prevented from moving in the releasing direction by the urging force of the coil spring 44b to maintain the engaged state.

After one of the lock pins 30 is inserted into the jack unit 4, the other lock pin 30 is entangled in a product or the like, and then, as shown in FIG.
Is inserted into the lock pin insertion hole 40a. Lock pin 30
Is inserted against the biasing force of the coil spring 44a provided in the lock pin insertion hole 40a, the lock pin 30
The convex portion 41a protruding into the lock pin insertion hole 40a of the lock spring 41 engages with the engaging concave portion 30a of the lock spring 41 to reliably prevent the lock pin 30 from moving in the releasing direction by the biasing force of the coil spring 44a. Maintain a good condition.
When both lock pins 30 of the wire unit 3 are inserted into the lock pin insertion holes 40a and 40b as described above, power supply from the battery V to each circuit in the housing 2 shown in FIG. Then, when the wire unit 3 is cut, the sensor tag 1 outputs an alarm as described above.

Next, when releasing the engagement between the wire unit 3 and the jack unit 4 from the state shown in FIG. 5, the engagement releasing key K shown in FIG. 13 is used. When the sensor tag 1 is normally removed from the antitheft object, the lock pin 30 is detached from only the lock pin insertion hole 40a on the side close to the key insertion hole 45 and removed from the antitheft object. When the wire unit 3 needs to be replaced, the lock pin 30 inserted in the lock pin insertion hole 40b on the side far from the key insertion hole 45 is also removed.

In order to remove the lock pin 30 only from the lock pin insertion hole 40a close to the key insertion hole 45, the adjustment cap 62 is tightened so that the insertion amount of the rack portion 63 into the key insertion hole 45 is shortened. In order to disengage the lock pin 30 from the lock pin insertion hole 40b on the side far from the key insertion hole 45, the adjustment cap 62 is loosened and the key of the rack portion 63 is used. The engagement releasing key K in a state where the insertion amount into the insertion hole 45 is lengthened is used.

When the rack portion 63 of the disengagement key K is inserted into the key insertion hole 45, the tip of the rack portion 63 lifts the pinion gear 46 and meshes with the rack portion 5a of the slider 5, as shown in FIG. When inserted further, FIG.
As shown in FIG. 7, the rack portion 63 of the engagement releasing key K meshes with the pinion gear 46, and the pinion gear 46 rotates as the rack portion 63 is inserted. This pinion gear 46
The rotation of the slider 5 moves the slider 5 having the rack portion 5a that meshes with the pinion gear 46 in the direction of arrow B in FIGS. 6 and 16. The amount of movement of the slider 5 at this time is determined by the first pressing portion 5d of the slider 5 and the lock spring 41.
The adjustment cap 62 of the engagement release key K is tightened so that the second pressing portion 5e and the end portion 42b of the lock spring 42 are not in contact with each other yet. The insertion amount of the rack portion 63 at this time is set.

Along with the sliding movement of the slider 5, the first
When the pressing portion 5d pushes the end portion 41b of the lock spring 41,
As shown in FIG. 6, the convex portion 41a of the lock spring 41 swings to a state of retracting from the lock pin insertion hole 40a. In this way, the engagement between the engaging concave portion 30a of the lock pin 30 and the convex portion 41a of the lock spring 41 is released. As a result, the lock pin 30 inserted into the lock pin insertion hole 40a is pushed out by the biasing force of the coil spring 44a, and the lock pin 30 is disengaged from the lock pin insertion hole 40a.

When the rack portion 63 of the disengagement key K is inserted into the key insertion hole 45, the rack portion 63 is paired with the reset terminals 47a, 47, as shown in FIG.
Contact b. Since the rack portion 63 is formed of a conductive material, when the rack portion 63 contacts the pair of reset terminals 47a and 47b, the reset switch R in FIG. 2 is closed, and as a result, the power supply holding circuit V
By the operation of K, the power supply from the battery V to each circuit of FIG. 2 is stopped, and the operation of the alarm output means AO is stopped.

Therefore, a pair of reset terminals 47 is provided.
a, 47b and the power supply holding circuit VK shown in FIG. 2 are alarms operated in the alarm release operation state by the rack portion 63 of the engagement release key K which is a rod-shaped release operation tool inserted in the key insertion hole 45. It functions as a release means AR. When removing the lock pin 30 from the lock pin insertion hole 40a and further removing the lock pin 30 inserted in the lock pin insertion hole 40b for replacement of the wire unit 3 or the like,
Engagement release key K with adjustment cap 62 loosened as described above
The rack portion 63 of is inserted into the key insertion hole 45.

Since the adjustment cap 62 is loosened, the insertion amount of the rack portion 63 into the key insertion hole 45 is long, and the slide movement amount of the slider 5 in the direction of arrow B in FIG.
The end of the second pressing portion 5e of the slider 5 and the lock spring 42, which is larger than that when the adjustment cap 62 is tightened, does not come into contact when the engagement release key K in which the adjustment cap 62 is tightened is inserted. The portion 42b abuts.

When the second pressing portion 5e pushes the end portion 42b of the lock spring 42, as shown in FIG. 7, the convex portion 42a of the lock spring 42 swings to a state of retracting from the lock pin insertion hole 40b. Thus, the engaging recess 3 of the lock pin 30
The engagement between 0a and the convex portion 42a of the lock spring 42 is released. As a result, the lock pin 30 inserted into the lock pin insertion hole 40b is pushed out by the biasing force of the coil spring 44b, and the lock pin 30 is disengaged from the lock pin insertion hole 40b.

[Other Embodiments] Other embodiments will be listed below.
In the above-described embodiment, the present invention is applied to the structure in which the sensor tag 1 (housing 2) is attached to the antitheft object by the wire unit 3 as an attachment.
As shown in (a) and FIG. 17 (b), it may be applied to a configuration in which the pin 103 as an attachment is attached by inserting it into the housing 2 with a cloth or the like as an anti-theft object sandwiched therebetween. Even in the case of such a configuration, the pin 103 is provided in the housing 2 as shown in FIG.
The detection switch SW is closed when the switch is closed, and the power supply to each circuit is started from the battery V by the closing operation of the detection switch SW. In this case, the detection switch SW is attached to the fixture (pin 103). Functions as a switch SW for detecting attachment / detachment to / from the housing 2.

Further, as shown in FIG. 19, the operation section 10 for the attachment / detachment detection switch (not shown) provided in the housing 2
The sensor tag 1 provided in a state in which the sensor 2 is biased to the side projecting from the surface of the casing 2 is pressed against the surface of an antitheft object such as a book while its operation portion 102 is pressed in close contact with the surface. It may be packaged integrally with the object. In this case, when the sensor tag 1 separates from the antitheft object, the operation unit 102 projects and the attachment / detachment detection switch operates to output a detachment detection signal.

In the above-described embodiment, the preliminary action detecting means SD includes the attachment (wire unit 3 etc.) and the attachment / detachment detection switch S.
W for outputting a detection signal of the detachment of the fixture from the housing 2 as the theft preliminary action detection information, and the preliminary action detection means SD having an antenna 22 and an antenna as the theft preliminary action detection information. Although the output of the reception signal is shown, the preliminary action detecting means SD is not limited to this.

In the above embodiment, the restraint means H is shown to be constituted by the delay capacitor C2, the oscillator circuit 26 and the counter 27, but the invention is not limited to this, and various hardware circuits other than this, and Alternatively, for example, a processing unit such as a microcomputer may be provided to perform processing by software.

In the above embodiment, the antenna for receiving the radio wave provided in the preliminary action detecting means SD is constituted by the resonance antenna 22, but the present invention is not limited to this, and various antennas can be used.

In the above embodiment, the alarm output means AO is L
Although the alarm information is output by turning on the ED lamp 20 and emitting the alarm sound of the piezoelectric buzzer 21, a radio wave for alarm is transmitted as the alarm information, and the receiver is installed in any place in the store. The radio wave may be received to sound an alarm.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an external view of a sensor tag according to an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram according to an embodiment of the present invention.

FIG. 3 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 4 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 5 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 6 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 7 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 8 is an external view of a transmitter according to an embodiment of the present invention.

FIG. 9 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 10 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 11 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 12 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 13 is an external view of an engagement releasing key according to an embodiment of the present invention.

FIG. 14 is an enlarged view of a main part of the engagement releasing key according to the embodiment of the present invention.

FIG. 15 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 16 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 17 is an external view of a sensor tag according to another embodiment of the present invention.

FIG. 18 is a circuit configuration diagram according to another embodiment of the present invention.

FIG. 19 is a perspective view of a sensor tag according to another embodiment of the present invention.

[Explanation of symbols]

 2 Case SD Preliminary activity detection means AO Alarm output means H Checking means 3,103 Fixture SW SW for attachment / detachment detection O Transmitter 22 Antenna

Claims (3)

[Claims] 1. A housing (2) attached to an anti-theft object is provided with a preliminary act detecting means (SD) for detecting a preliminary act of theft, and the spare is provided inside the housing (2). Action detection means (S
A theft prevention device provided with an alarm output means (AO) for outputting alarm information based on the detection information of D), wherein the theft anti-theft action detection information output by the preliminary action detection means (SD) is set. An anti-theft device provided with a restraint means (H) that causes the alarm output means (AO) to output the alarm information only when continuous for a time or more. 2. A mounting tool (3, 103) connected to the housing (2) for mounting the housing (2) on an anti-theft object by the preliminary action detection means (SD), and the mounting tool (3, 103). A detachment detection switch (SW) for electrically detecting attachment / detachment of the fixture (3, 103) to / from the housing (2) is provided, and the alarm output means (AO) detects a preliminary theft act. The antitheft device according to claim 1, wherein the antitheft device is configured to output alarm information based on a detachment detection signal of the attachment / detachment detection switch (SW) as information. 3. The preliminary action detecting means (SD) includes an antenna (22) provided in the housing (2) for receiving radio waves from a transmitter (O) installed at a specific location. The alarm output means (AO) is based on the received signal of the antenna (22) as the theft preliminary action detection information,
The antitheft device according to claim 1, wherein the antitheft device is configured to output alarm information.