JP3081458B2 - 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 a housing attached to an object to be stolen and provided with a preliminary act detecting means for detecting a preliminary act of theft. The present invention relates to an anti-theft device provided with alarm output means for outputting alarm information based on the detection information.

[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, for example, and the casing of the anti-theft device is illegally removed from the anti-theft object, or When a preliminary act of theft is performed, such as a fraudulent removal of the antitheft object with the housing of the antitheft device attached to the store, the preliminary act detection means detects it, and The alarm output means outputs the alarm information to warn the store employee or the like that the above-described preliminary action of theft has been performed, thereby preventing loss due to theft.

[0003] In order to detect the above-mentioned preparatory act, the housing of the anti-theft device is stolen by using, for example, an attachment made of a conductive wire or the like connected to the housing by pins at both ends. The anti-theft device is illegally removed from the anti-theft object by attaching it to the object and detecting by a circuit inside the housing that the wire has been cut or the pins at both ends have come off the connection part of the case. And that
A built-in antenna for radio wave reception is built in the housing, for example, by receiving a radio wave from a transmitter installed at the entrance of the store and issuing an alarm, the fraud prevention target with the anti-theft device attached is fraudulently It was intended to detect that it was taken out of the store.

[0004]

However, in the above prior art, disconnection of the wire or disconnection from the housing is ultimately detected by mechanically opening and closing a contact (switch). Even when a light shock or vibration is applied to the housing and a so-called chattering phenomenon in which the contacts are intermittently performed in a short time, even if the preliminary theft action is not performed, it is erroneously detected that the action has been performed,
Further, even when noise radio waves are on the antenna for a short period of time, there is a risk of erroneously detecting that a preparatory theft has occurred, and improvement has been desired.

The present invention has been made in view of the above circumstances, and has as its object to erroneously prevent a case where a light shock or vibration is applied to a housing or a case where a noise radio wave gets on an antenna for a short time. Avoid detecting preliminary theft,
It is to improve the operation reliability of the anti-theft device.

[0006]

According to the present invention, there is provided an anti-theft device provided with a preparatory act detecting means for detecting a preliminary act of theft in a housing attached to an anti-theft object. Alarm output means for outputting alarm information based on the detection information of the preliminary action detection means, the first characteristic configuration of which is that the preliminary action detection means output by the preliminary action detection means Checking means for outputting the alarm information by the alarm output means only when the information continues for a set time or more is provided , and
Switching that outputs a control signal when output information is input
A circuit is provided, and the check means includes a delay capacitor.
The stolen preliminary action detection information continues for a set time or more.
Only when the alarm information is output by the alarm output means
And when the control signal is inputted, pulse oscillation is started.
Start and stop pulse oscillation when the control signal stops
An oscillation circuit that performs the operation and the oscillation circuit when the control signal is input.
Starts counting the number of oscillation pulses in the
If it exceeds, a count completion signal is output and the control signal is
When stopped, counting stops and the pulse count is reset.
A counter that counts the count.
The operation of the alarm output means must be performed after the completion signal is output.
The point is that it is configured not to start the work .

[0007] A second feature configuration is the above-mentioned first feature configuration, wherein the preliminary act detection means is connected to the housing for mounting the housing on an anti-theft object;
A detachment detection switch for electrically detecting attachment / detachment of the attachment to / from the housing, wherein the alarm output unit outputs a detachment detection signal of the detachment detection switch as theft preliminary action detection information. , And is configured to output alarm information based on the

[0008] A third characteristic configuration is that, in the first or second characteristic configuration, the preliminary action detection means is provided in the housing and includes an antenna for receiving a radio wave from a transmitter installed at a specific location. The alarm output means is configured to output alarm information based on a signal received by the antenna as preliminary theft detection information.

[0009]

According to the first feature of the present invention, when the theft detection information output by the preliminary detection means continues for a set time or more, the alarm information is output by the alarm output means. When the preliminary action detection information is shorter than a set time, such as when the preliminary action detection means outputs the same due to a disturbance, no alarm information is output.

[0010] According to the second characteristic configuration, an attachment such as a wire connected to the housing for attaching the housing to the anti-theft object is detached or cut off from the connection portion. When the attachment is removed, the attachment / detachment detection switch detects the detachment of the attachment from the housing as a theft preparatory act. When the detachment detection signal continues for a set time or longer, alarm information is output by the alarm output means. For example, when the departure detection signal is shorter than the set time, no alarm information is output.

According to the third characteristic configuration, when the antenna provided in the housing receives a radio wave from a transmitter installed at a specific place such as an entrance, the received signal is used as theft preparatory act detection information. Is detected. Then, when the received signal continues for a set time or longer, alarm information is output by the alarm output means. For example, as in the case where a short-time noise radio wave rides on an antenna, the received signal is not longer than the set time. In the case of, no alarm information is output.

[0012]

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

Further, according to the second characteristic configuration, an anti-theft device in which the housing is attached to the anti-theft object by using an attachment such as a wire and the likelihood of the theft is detected by detaching the attachment from the housing. In this case, it is possible to prevent the erroneous warning that a preliminary theft has occurred due to a disturbance from occurring, and to obtain suitable means for implementing the first characteristic configuration.

According to the third characteristic configuration, the antenna built in the housing receives radio waves from a transmitter installed at an entrance or the like, and thereby the object to be stolen is combined with the anti-theft device attached thereto. In the anti-theft device that detects a preparatory theft act that is to be taken out, it is no longer erroneously warned that the preparatory theft act has been performed by noise radio waves or the like. Suitable means 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. 1 (a) and FIG.
As shown in the side view of (b), the sensor tag 1 as an anti-theft device has a rectangular parallelepiped housing 2 attached to a product or the like as an anti-theft object, and the housing 2 is attached to the anti-theft object. And a wire unit 3 functioning as a mounting tool connected to the housing 2 for mounting. As shown in FIG. 3, the wire unit 3 includes a lock pin 30 provided at both ends for insertion and removal into and from the housing 2, and both lock pins 3.
0, and a jacket 3 covering all of the 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.
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 of the jacket 32 covering the lock pin 30 is immersed in the housing 2 and the lock pin 30 is exposed to the outside as shown in FIG. I try not to. Thus, 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.

As shown in FIG. 2, the following circuits are provided inside the housing 2. 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 receiving state, and outputs a wire cutting 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 wire cut signal is input from the wire input circuit 24, an oscillation circuit 26 that starts pulse oscillation when a control signal is input from the switching circuit 25, and a switching circuit. When a control signal is input from the oscillation circuit 26,
The counter 27 starts counting the number of oscillation pulses and outputs a count completion signal when the count exceeds a set count. When the count completion signal of the counter 27 is input, the switching signal is input to the switching circuit 25 by the reception signal or the wire cutting signal. Latch circuit 28 and counter 27 for maintaining
Buzzer LE that turns on the LED lamp 20 and activates the piezoelectric buzzer 21 when the count completion signal is input.
The D driver 29, the battery V for supplying power to each circuit in the housing 2, and the battery V by connecting the negative electrode of the battery and the ground of each circuit as the wire unit 3 is inserted into the housing 2. A power supply holding circuit VK or the like is provided for starting the power supply to each circuit, and once the power supply is started, maintaining the power supply unless the reset switch R is closed.

The circuit having the above-described configuration is used when the wire unit 3 is cut off when the housing 2 is attached to a product or the like to be stolen by the wire unit 3 or when the sensor tag 1 When a pair of panel-shaped transmitters O installed at specific locations such as both sides of the entrance as shown in FIG. 8 pass, the piezoelectric buzzer 21 housed in the housing 2 sounds and an alarm is issued. It is configured to output. As the oscillator O, one of the pair of panel-shaped oscillators may be installed on one side of the doorway, or may be installed on the floor of the doorway.

Hereinafter, a process until the piezoelectric buzzer 21 starts sounding in the above case will be described. First, when the wire unit 3 is disconnected from the housing 2 due to, for example, the wire unit 3 being cut, a pair of electrode portions t, t into which both lock pins 30 of the wire unit 3 are inserted.
The terminal on the input side of the wire input circuit 24 connected to one of the terminals rises from the ground potential. The other of the pair of electrode portions t, t is connected to the ground. The wire input circuit 24 detects that the wire unit 3 has been disconnected or the like when the terminal on the input side reaches a set potential or more. Thus, the pair of electrode parts t, t constitutes a detachment detection switch SW for detecting detachment of the wire unit 3 from the housing 2. And the wire input circuit 2
4 detects a disconnection of the wire unit 3 and 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 performs pulse oscillation while receiving the control signal. , The counter 27 counts the number of oscillation pulses of the oscillation circuit 26.
Then, when the control signal stops, the oscillation circuit 26 stops the pulse oscillation, the counter 27 stops counting, and resets the pulse count. The counter 27 sends one pulse signal as a count completion signal to the latch circuit 28 and the buzzer / LED driver 29 every time the counting of the preset number of pulses is completed. 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 operates so as to emit 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 keeps the switching circuit 25 in the state of receiving the disconnection signal, and the switching circuit 25 continues to send a control signal to the oscillation circuit 26 and the counter 27. . As a result, once the counter 27 sends out 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 an alarm is issued by the LED lamp 20 and the piezoelectric buzzer 21, an impact is applied to the housing 2 so that the positive or negative electrode of the battery V is instantaneously moved from the connection terminal. In order to prevent the alarm in the case 2 from being reset by resetting the circuit in the housing 2 even in the case where the battery is separated, the power supply capacitor C1 for supplementarily supplying current is connected to the battery V. They are provided in parallel.

When the sensor tag 1 passes through the place where the transmitter O is installed, the resonance antenna 22 generates an electromotive force by a radio wave from the transmitter O, and the antenna input circuit 23 detects the electromotive force, and The received 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 a radio wave from the transmitter O. The operation of each circuit after the switching circuit 25 receives the reception signal is the same as the case where the wire unit 3 is disconnected, and the description is omitted.

As described above, the wire unit 3, the attachment / detachment detection switch SW, the resonance antenna 22, and the antenna input circuit 2
3 and the wire input circuit 24, etc., disconnect the wire unit 3 and illegally remove the sensor tag 1 from the anti-theft object, or take the anti-theft object attached with the sensor tag 1 out of the store to prevent theft. Functioning as a preliminary action detection means SD for detecting a target action, and includes a switching circuit 25, an oscillation circuit 26, a counter 27, and a latch circuit 2.
8. The buzzer / LED driver 29, the LED lamp 20, the piezoelectric buzzer 21 and the like function as alarm output means AO for outputting alarm information by light and sound based on the detection information of the preliminary action detection means 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
O is configured to output alarm information based on a detachment detection signal of the attachment / detachment detection switch SW as theft preliminary action detection information, and the preliminary action detection means SD includes a resonance antenna 22. At the same time, the alarm output means AO is configured to output the alarm information based on the reception signal of the resonance antenna 22 as the theft preliminary action detection information.

The input side terminal of the wire input circuit 24 is connected to the ground via a delay capacitor C2, whereby vibration is applied to the wire unit 3 and the like, so that the electrode portions t, Even if the contacts between the wire unit 3 and the circuit in the housing 2 such as between t and the lock pin 30 intermittently operate in a short time, the potential on the input side of the wire input circuit 24 is prevented from rising sharply, This prevents the wire input circuit 24 from malfunctioning even though the wire unit 3 is not cut. At the same time, in the operation of the transmitting circuit 26 and the counter 27, after the counter 27 outputs the first count completion signal after counting the set number of pulses from the transmitting circuit 26 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 if the detachment detection signal or the antenna reception signal of the detachment detection switch SW due to wire disconnection or the like does not continue for a certain period of time or longer. Are the piezoelectric buzzer 21 and L
The ED lamp 20 does not operate, thereby preventing malfunction due to noise or the like.

Therefore, only when the preliminary theft detection information (the departure detection signal and the antenna reception signal) outputted by the preliminary action detection means SD continues for a set time or more, the alarm output means AO outputs the alarm. The restraining means H for outputting information includes the delay capacitor C2 and the transmission circuit 26.
And the counter 27.

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

The lock springs 41 and 42 have their bent portions 4
At 1c and 42c, they are locked by spring locking projections 49 protruding from the main body of the jack unit 4. End portions 41b, 42b of lock springs 41, 42 on the side farther from bent portions 41c, 42c and bent portions 41c, 42c.
At the intermediate portion between the two, convex portions 41a and 42a which engage with the engaging concave portions 30a of the lock pin 30 are provided in such a manner as to be able to move into and out of the lock pin insertion holes 40a and 40b as described later.

Further, since the lock springs 41 and 42 are made of metal and formed in a hook shape, the lock springs 41 and 42 have elasticity in a direction in which both ends approach or separate from each other. As shown in FIG. 3, the convex portions 41a,
42a is in a state of protruding almost to the center of the lock pin insertion holes 40a and 40b. Therefore, the lock pin 30
When the engaging concave portions 30a and the convex portions 41a and 42a engage with each other, the convex portions 41a and 42a are locked by the lock pin insertion holes 40a and 40a.
The lock springs 41 and 42 are urged toward the side of engagement with the lock pin 30 by being pushed in the direction of withdrawing from the 40b.

The lock pin insertion holes 40a and 40b are closed on the back side, and a metal coil spring 4 having one end fixed to the back end of the lock pin insertion holes 40a and 40b.
4a and 44b are provided respectively. The metal coil springs 44a and 44b are provided with lock pin insertion holes 40a and
The lock pin 30 inserted into the 40b is urged toward the release side, and is in contact with metal conductive terminals 48a and 48b at the fixed end.

As shown in FIG. 9, one end of the conduction terminal 48b protrudes into the rear end of the lock pin insertion hole 40b to come into contact with the coil spring 44b, and the other end is shown in FIG. It is in contact with the electrode surface 6a formed on the circuit board 6 constituting the circuit. The conductive terminal 48a has substantially the same configuration as the conductive terminal 48b, although the connection position to the circuit board 6 is different. Thus, 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 releasing 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 disengagement key K described later is inserted into the key insertion hole 45. FIG.
FIG. 11 is a partial cross-sectional view taken along the line PP ′ in FIG.
In addition, as shown in FIG. 12 when the key insertion hole 45 is viewed from the outside, the key insertion hole 45 is rotated by the insertion of the disengaging key K into the key insertion hole 45 of the rack portion 63. 2 and a reset switch R shown in FIG.
A pair of reset terminals 47a, 47 which are part of
b from the side wall of the key insertion hole 45 to the key insertion hole 4
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 by the jack unit 4 body so that the direction in which the teeth extend is perpendicular to the direction in which the rack 63 of the disengaging key K is inserted. 3 to 7, it is supported so as to be able to move a little in a direction perpendicular to the paper surface.
In a state where the rack portion 63 of the disengaging key K is not inserted in the key 5, as shown in FIG. 10, it is located inside the key insertion opening 45 and does not mesh with a rack portion 5 a of the slider 5 described later. And the rack portion 6 of the key K for disengaging
In a state in which the rack unit 3 is inserted, the rack unit 63 is pushed up by the rack unit 63, and a part of the rack unit 63 projects to the outside of the jack unit 4 and meshes with the rack unit 5 a of the slider 5.

A pair of reset terminals 47a, 47
b is provided on both sides of the rear shielding wall 45b of the two shielding walls 45a and 45b so as to be exposed in the key insertion hole 45, and as shown in FIG. 2 are connected to the circuit shown in FIG. 2 by contacting the electrode surfaces 6b formed on the circuit board 6 at the portions exposed to the outside. Two shielding walls 45
The shielding wall 45a on the entrance side of the key insertion holes 45a and 45b is formed on a ridge extending from the entrance side end of the key insertion hole 45 toward the back side in the longitudinal direction of the key insertion hole 45, specifically, a plate in an upright position. It is formed as a shape. The rear-side shielding wall 45b is formed as a substantially L-shaped plate-like body as shown in FIG. 10, and a portion formed on the side surface of the key insertion hole 45 as viewed in the longitudinal direction includes an entrance-side shielding wall. Like the key insertion hole 45a, the key insertion hole 45 has a protrusion extending in the longitudinal direction.

The shielding wall 45a on the entrance side and the shielding wall 45 on the back side
b, as shown in FIG. 12, virtually assuming the center of the key insertion hole 45 in the longitudinal direction as the center of the circle, the position of the key insertion hole 45 in the inner wall portion in the longitudinal direction is When represented by the phase of the virtual circle, the phases are formed 180 degrees different from each other. The rear shielding wall 45b is located between the pair of reset terminals 47a, 47b over the entire area where the pair of reset terminals 47a, 47b is 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, 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 is closed in the circuit shown in FIG. 2 and the supply of power from the battery V to each circuit is stopped. Therefore, the shielding wall 45b is formed as described above, and a pair of resets is performed. This prevents the terminals 47a and 47b from being short-circuited easily by the insertion of a conductive foreign matter.

A slider 5 provided with a rack portion 5a which meshes with the pinion gear 46 of the jack unit 4 in the 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 the direction indicated by an arrow A in FIG. And is slidably movable, and is biased to return to the inside of the housing. As shown in FIGS. 3 to 7, the slider 5 has a first pressing portion 5 d that comes into contact with an end 41 b of the lock spring 41 as the slider 5 slides, and an end 42 of the lock spring 42.
b, a second pressing portion 5e is formed to be in contact with the end portion 42b of the lock spring 42 and the second pressing portion 5e is longer than the distance between the end portion 41b of the lock spring 41 and the first pressing portion 5d. It is made longer.

The disengagement key K has the outer shape shown in FIG. 13A, and extends in the longitudinal direction with respect to the outer sleeve 61 as shown in FIGS. 13B and 13C. The inner sleeve 60, which is relatively movable and is urged to return in the separation direction, is immersed in the outer sleeve 61, so that the rack portion 63 fixedly connected to the outer sleeve 61 appears. The tip of the rack 63 is
Slightly projecting from the tip of the inner sleeve 60,
The operation of inserting the rack portion 63 into the key insertion hole 45 is facilitated. The amount of immersion of the inner sleeve 60 into the outer sleeve 61 can be determined by the state shown in FIG.
The setting can be changed in two steps between the state shown in FIG. 13C in which the adjustment cap 62 is loosened with respect to the outer sleeve 61, 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 larger than the diameter of the entrance of the key insertion hole 45, when the rack 63 is inserted into the key insertion hole 45, the tip of the inner sleeve 60 becomes the jack unit 4. And the inner sleeve 60 is immersed in the outer sleeve 61. When the immersion amount reaches the immersion amount set as described above, the rack 63 cannot be inserted any more, thereby restricting the insertion amount of the rack 63 into the key insertion hole 45. It is. Therefore, the rack 6
The insertion amount of the third key insertion hole 45 can be adjusted in two steps by operating the adjustment cap 62 described above.

As shown in FIG. 14 (a) when the rack 63 is viewed from the front end and FIG. 14 (b) which is a partial side sectional view of the rack 63, the rack 63 has a long groove 63a on the rack forming surface side. And it is configured in a specific shape having two concave grooves of a short groove 63b opposite to the rack forming surface. The cross-sectional shapes of the long groove 63a and the short groove 63b in the longitudinal direction are substantially the same as the cross-sectional shapes of the entrance-side shielding wall 45a and the rear-side shielding wall 45b formed in the key insertion hole 45 shown in FIG. And the shielding wall 45a on the entrance side is
3a, the rear shielding wall 45b is engaged with the short groove 63b, respectively, so that the rack portion 63 of the disengaging 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 insertion blocking means IS that allows the rack portion 63 having a specific shape to be inserted into the key insertion hole 45 and prevents the false operation tool having a shape other than the specific shape from being inserted into the key insertion hole 45. Since the long groove 63a of the rack 63 corresponds to the shielding wall 45a on the entrance side of the key insertion hole 45, the length of the groove corresponds to the shielding wall 45b on the back side.
It is longer than b.

Next, the engagement between the wire unit 3 and the housing 2 and the release of the engagement 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. 3 are disengaged from the lock pins 30 as shown in FIG. Is inserted into the lock pin insertion hole 40b of the jack unit 4. When the lock pin 30 is inserted against the urging force of the coil spring 44b provided in the lock pin insertion hole 40b, the lock spring 4 is inserted into the engagement recess 30a of the lock pin 30.
The projection 42a protruding into the second lock pin insertion hole 40b engages, and reliably prevents the lock pin 30 from moving in the release direction by the urging force of the coil spring 44b, thereby maintaining the engagement state.

With one of the lock pins 30 inserted into the jack unit 4 and the other lock pin 30 entangled with a product or the like, as shown in FIG.
Into the lock pin insertion hole 40a. Lock pin 30
Is inserted against the urging force of the coil spring 44a provided in the lock pin insertion hole 40a.
The projection 41a protruding into the lock pin insertion hole 40a of the lock spring 41 is engaged with the engagement recess 30a, and the lock pin 30 is reliably prevented from moving in the release direction by the urging force of the coil spring 44a. Maintain a match state.
When both the 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. When the wire unit 3 is cut or the like, the sensor tag 1 outputs an alarm as described above.

Next, when the engagement between the wire unit 3 and the jack unit 4 is released from the state shown in FIG. 5, an engagement release key K shown in FIG. 13 is used. Normally, when removing the sensor tag 1 from the anti-theft object, the sensor pin 1 is used by detaching the lock pin 30 only from the lock pin insertion hole 40a near the key insertion hole 45 and removing the lock pin 30 from the anti-theft object. When the wire unit 3 needs to be replaced, the lock pin 30 inserted in the lock pin insertion hole 40b farther from the key insertion hole 45 is also detached.

In order to remove the lock pin 30 only from the lock pin insertion hole 40a on the side close to the key insertion hole 45, the adjustment cap 62 is tightened so that the insertion amount of the rack 63 into the key insertion hole 45 is shortened. To release the lock pin 30 from the lock pin insertion hole 40b far from the key insertion hole 45 using the engagement release key K in the The disengagement key K is used in a state where the amount of insertion into the insertion hole 45 is increased.

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

With the sliding movement of the slider 5, the first
When the pressing portion 5d presses the end 41b of the lock spring 41,
As shown in FIG. 6, the convex portion 41a of the lock spring 41 swings so as to retreat from the lock pin insertion hole 40a. Thus, 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 into which the lock pin insertion hole 40a is inserted is pushed out by the urging force of the coil spring 44a, and the lock pin 30 is separated 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, as shown in FIG. 16, the rack portion 63 is brought into a pair of reset terminals 47a, 47.
b. Since the rack 63 is made of a conductive material, when the rack 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 holding circuit V
By the operation of K, the power supply from the battery V to each circuit in FIG. 2 is stopped, and the operation of the alarm output means AO is stopped.

Therefore, a pair of reset terminals 47
The power holding circuit VK shown in FIGS. 2A and 2B and the power holding circuit VK shown in FIG. It functions as release means AR. When the lock pin 30 inserted in the lock pin insertion hole 40b is further removed for replacement of the wire unit 3 from the state where the lock pin 30 is removed from the lock pin insertion hole 40a,
The disengagement key K with the adjustment cap 62 loosened as described above
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 sliding movement amount of the slider 5 in the direction of arrow B in FIG.
The second pressing portion 5e of the slider 5 and the end of the lock spring 42, which are larger than when the adjustment cap 62 is tightened and do not come into contact when the disengagement key K in which the adjustment cap 62 is tightened is inserted. The portion 42b contacts.

When the second pressing portion 5e presses the end portion 42b of the lock spring 42, the convex portion 42a of the lock spring 42 swings to retreat from the lock pin insertion hole 40b as shown in FIG. Thus, the engagement recess 3 of the lock pin 30
That is, the engagement between the protruding portion 42a of the lock spring 42 and the protruding portion 42a of the lock spring 42 is released. As a result, the lock pin 30 into which the lock pin insertion hole 40b is inserted is pushed out by the urging force of the coil spring 44b, and the lock pin 30 is separated from the lock pin insertion hole 40b.

[Other Embodiments] Hereinafter, other embodiments will be listed.
In the above embodiment, the present invention is applied to a configuration in which the sensor tag 1 (housing 2) is attached to the anti-theft object by the wire unit 3 as an attachment.
As shown in (a) and FIG. 17 (b), the present invention may be applied to a configuration in which a pin 103 as an attachment is attached by inserting the pin 103 into the housing 2 with a cloth or the like to be stolen. Even in the case of such a configuration, as shown in FIG.
, The detection switch SW is closed, and the closing operation of the detection switch SW allows the battery V to start supplying power to each circuit. In this case, the detection switch SW is attached to the mounting member (pin 103). Functions as a switch SW for detecting attachment / detachment to the housing 2.

As shown in FIG. 19, an operation unit 10 for a detachment detection switch (not shown) provided in the housing 2 is provided.
The sensor tag 1 provided in a state where the sensor tag 2 is returned to the side protruding from the surface of the housing 2 is pressed in a state where the operation unit 102 is pressed against the surface of the anti-theft object such as a book. It may be one that is packaged integrally with the object. In this case, when the sensor tag 1 separates from the anti-theft object, the operation unit 102 protrudes and the detachment detection switch operates to output a detachment detection signal.

In the above embodiment, the preparatory action detecting means SD is provided with the mounting tool (such as the wire unit 3) and the detachment detecting switch S.
W, and outputs a detection signal of detachment of the fixture from the housing 2 as preliminary theft detection information, and the preliminary action detection means SD includes an antenna 22 and an antenna as preliminary theft detection information. Although the output of the reception signal is shown, the preliminary action detection means SD is not limited to this.

In the above embodiment, the restraining means H is constituted by the delay capacitor C2, the transmitting circuit 26 and the counter 27. However, the present invention is not limited to this. For example, an arithmetic unit such as a microcomputer may be provided to perform software processing.

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

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

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of the drawings]

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

FIG. 2 is a circuit 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 a disengagement key according to the embodiment of the present invention.

FIG. 14 is an enlarged view of a main part of the disengagement 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 action detection means AO Alarm output means H Checking means 3,103 Fixture SW Switch for attachment / detachment detection O Transmitter 22 Antenna

Continuation of front page (72) Inventor Yasuhiro Noma 1-7-12 Tsukishima, Chuo-ku, Tokyo (56) References JP-A-4-242892 (JP, A) JP-A-2-14398 (JP, A) (58 ) Surveyed field (Int.Cl. ⁷ , DB name) G08B 13/24 G08B 13/14

Claims (3)

(57) [Claims] 1. A housing (2) attached to an anti-theft object is provided with a preliminary action detecting means (SD) for detecting a preliminary action of theft, and the spare (2) is provided inside the housing (2). Action detection means (S
D) An anti-theft device provided with alarm output means (AO) for outputting alarm information based on the detection information, wherein the preliminary action detection information output by the preliminary action detection means (SD) is set. only when a continuous time or longer, the alarm output means (AO) said restraining means for outputting the alarm information (H) is provided at, out of the control signal the theft pRELIMINARY detection information is input
A switching circuit (25) is provided, and the check means (H) detects the preliminary theft by the delay capacitor (C2).
Only when the information continues for more than the set time, the alarm output
Means (AO) for outputting the alarm information, and when the control signal is input, starts pulse oscillation and
An oscillation circuit that stops pulse oscillation when the control signal stops
(26) the oscillation circuit, when the control signal is input,
Start counting the number of oscillation pulses in (26) and set
Output a count completion signal when the number exceeds
When the signal stops, counting stops and the pulse count
A counter (27) for resetting;
(27) is not after outputting the count completion signal
Not to start the operation of the alarm output means (AO)
Anti-theft device configured . 2. An attachment (3, 103) connected to the housing (2) for mounting the housing (2) to an anti-theft object by the preliminary action detection means (SD); An attachment / detachment detection switch (SW) for electrically detecting attachment / detachment of the attachment (3, 103) to / from the housing (2), wherein the alarm output means (AO) detects a preliminary theft action The anti-theft device according to claim 1, wherein the anti-theft 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 detection means (SD) includes an antenna (22) provided in the housing (2) for receiving a radio wave from a transmitter (O) installed at a specific location. The alarm output means (AO) is configured to perform the following based on a reception signal of the antenna (22) as theft preliminary action detection information:
3. The anti-theft device according to claim 1, wherein the anti-theft device is configured to output alarm information.