JP3032429B2 - Radio reception notification 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 a receiving antenna for receiving a radio wave provided with a coil, a buzzer which is electrically capacitive, and sounds the buzzer as the receiving antenna receives a sounding command radio wave. The present invention relates to a radio wave receiving and notifying device including a sound generation control unit to be activated, and an anti-theft device provided with the radio wave notifying device.

[0002]

2. Description of the Related Art In such a radio wave receiving / reporting device, a sounding control means activates a buzzer as a receiving antenna receives a sounding command radio wave, so that a person near the radio wave receiving / reporting device can transmit a radio wave. This is for notifying that the reception notifying device is in a state of receiving the sounding command radio wave. One example of the application of the radio wave reception notification device is an anti-theft device. As a configuration in the case where the radio wave notification device is applied to the anti-theft device, the radio wave notification device is provided in the housing of the anti-theft device, and the housing of the anti-theft device is attached to a product or the like displayed in a store. In addition, a transmitter for transmitting a sounding command radio wave is installed at, for example, an entrance of a store.

In this state, if the user tries to illegally take the antitheft object out of the store with the antitheft device housing attached, he or she receives a sounding command radio wave from the transmitter at the entrance of the store and reports the radio wave reception. Activate the buzzer of the device,
It notifies the employees of the store that they are receiving the sounding command radio wave, that is, the fact that the anti-theft object is being illegally taken out of the store, and can prevent theft from occurring. is there. By the way, conventionally, the radio wave receiving and notifying device which operates as described above and the anti-theft device to which the radio wave receiving and notifying device is applied have driven the buzzer with the output voltage of the driving power supply to generate sound.

[0004]

However, in the above conventional configuration, since the output voltage of the generally used driving power source is not so high, the volume of the buzzer cannot be made sufficiently high and the sounding command radio wave is received. In some cases, it was not possible to accurately report the status. On the other hand, in order to increase the volume of the buzzer, a circuit that raises the voltage applied to the buzzer by a resonance circuit has been considered, but if this circuit was added to the radio wave reception notification device as it was, The configuration is complicated, which leads to an increase in manufacturing cost and a disadvantage that the size of the apparatus cannot be reduced. Since the anti-theft device is used by attaching its housing to an anti-theft object, there is a strong demand for downsizing the housing, and the above-mentioned inconvenience is particularly problematic. The present invention has been made in view of the above circumstances, and has as its object to increase the volume of a buzzer while minimizing the complexity of the circuit configuration.

[0005]

According to the present invention, there is provided a radio wave receiving and notifying apparatus comprising: a receiving antenna for receiving a radio wave provided with a coil; an electrically capacitive buzzer; Accompanied by a sound control means for sounding the buzzer, the characteristic configuration of which connects the buzzer and all or a part of the coil provided in the receiving antenna to form a resonance circuit. The point is that it is formed.

A first characteristic configuration of the anti-theft device of the present invention is as follows.
A radio wave receiving / reporting device having the above-described configuration is provided in a housing attached to the anti-theft object, and a transmitter for transmitting a sounding command radio wave to the receiving antenna is provided at a specific location. The second characteristic configuration of the anti-theft device of the present invention is the same as the first characteristic configuration of the anti-theft device,
The casing is provided with preliminary act detection means for detecting a preliminary act for removing the same from the anti-theft object as a theft preliminary act, and the sound control means detects the preliminary act by the preliminary act detection means. With such a configuration, the buzzer is sounded.

A third characteristic configuration of the anti-theft device of the present invention is as follows.
In the first characteristic configuration or the second characteristic configuration of the anti-theft device, sound emission canceling means for stopping operation of the sound emission control means is provided inside the housing, and the sound emission canceling means is provided inside the housing from an outer surface portion of the housing. An insertion hole for release operation is formed toward the release operation device, and the release operation tool inserted into the insertion hole for release operation is configured to operate the sound release unit in a sound release state. .

[0008]

According to the characteristic configuration of the radio wave reception notification device of the present invention, the resonance circuit is formed by connecting the electrically capacitive buzzer and all or a part of the coil provided in the reception antenna. The voltage applied to the buzzer can be increased by the resonance between the electrically capacitive buzzer and the electrically inductive coil, and as a result, the sound volume of the buzzer increases. In addition, the circuit configuration for increasing the volume of the buzzer is combined with the coil originally provided for receiving the sounding command radio wave, so that the circuit configuration for increasing the volume of the buzzer is complicated. Can be suppressed.

According to the first characteristic configuration of the anti-theft device of the present invention, by providing the radio wave receiving and notifying device having the above characteristic configuration in the housing, the volume of the buzzer can be increased and the circuit configuration can be complicated. Can be suppressed. According to the second characteristic configuration of the anti-theft device of the present invention, the buzzer is activated even when the preliminary act detection means detects that the housing of the anti-theft device has been removed from the anti-theft object. According to the third characteristic configuration of the present invention, when the anti-theft object is sold regularly,
It is necessary to prevent the buzzer from sounding even if the housing of the anti-theft device is removed from the anti-theft object.In this case, the release operation tool is inserted into the insertion hole of the anti-theft device housing. Then, the sound control means of the radio wave reception notifying device is operated to the sound release state.

[0010]

According to the characteristic configuration of the above-described radio wave reception notification device, the volume of the buzzer can be increased while suppressing the complexity of the circuit configuration. According to the first characteristic configuration of the anti-theft device, as described above, the volume of the buzzer can be increased and the complexity of the circuit configuration can be suppressed, so that the configuration of the anti-theft device is complicated and the housing becomes large. It is possible to increase the volume of the buzzer and accurately notify the reception of the sounding command radio wave from the transmitter while suppressing the occurrence of the sound as much as possible.

According to the second characteristic configuration of the anti-theft device, in addition to the effects of the first characteristic configuration of the anti-theft device, the theft can be achieved only by receiving the sounding command radio wave from the transmitter and activating the buzzer. The theft cannot be prevented if the case of the anti-theft device is removed from the object of the anti-theft device and passes through the location where the transmitter is installed.However, the removal of the case of the anti-theft device must also be detected and reported by a buzzer. Thus, theft can be prevented accurately. Third of the anti-theft device
According to the characteristic configuration, in addition to the first or second characteristic configuration of the anti-theft device, a simple operation of simply inserting the release operation tool into the insertion hole of the housing of the anti-theft device can be performed, and the radio wave reception notification device can be operated. Since the sound control means can be operated to the sound release state, and the sound control means of the radio wave reception and notification device cannot be operated to the sound release state without the release operation tool, an unauthorized release operation can be prevented.

[0012]

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 constituting the anti-theft device has a rectangular parallelepiped casing 2 and a wire having a function as a mounting tool for attaching the casing 2 to a product or the like which is an anti-theft object. And unit 3. Wire unit 3
As shown in FIG. 3, lock pins 30 provided at both ends for insertion into and removal from the housing 2, wires 31 connecting the lock pins 30, and a part of the wires 31 and the lock pins 30. And a jacket 32 for covering the.

The lock pin 30 and the wire 31 are made of metal and have conductivity, and the lock pins 30 at both ends are electrically connected. 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. Further, when the lock pin 30 is inserted into the housing 2, the end of the jacket 32 that covers the lock pin 30 slightly sinks into the housing 2 as shown in FIG. Is not exposed to the outside. 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, L
A resonance antenna 22 comprising a ED lamp 20, a piezoelectric buzzer 21, a coil 22a and a capacitor 22b, which is a reception antenna for radio wave reception, and an antenna input circuit 23 for outputting a reception signal when the resonance antenna 22 is in a reception state.
And a wire input circuit 24 that outputs a wire cutting signal when the wire unit 3 is not properly connected.
A switching circuit 25 that outputs a control signal when a reception signal from the antenna input circuit 23 or a wire cutting signal from the wire input circuit 24 is input, and starts pulse oscillation when a control signal from the switching circuit 25 is input. An oscillation circuit 26, a counter 27 that starts counting the number of oscillation pulses of the oscillation circuit 26 when a control signal from the switching circuit 25 is input, and outputs a count completion signal when the count exceeds a set count, and a counter completion signal of the counter 27 is output. A latch circuit 28 which keeps the switching circuit 25 in a state where the reception signal or the wire cutting signal is inputted when inputted, and an LED lamp 20 which is turned on and a piezoelectric buzzer 21 The buzzer / LED driver 29 that sounds V, the power supply to each circuit from the battery V is started by connecting the negative electrode of the battery and the ground of each circuit as the wire unit 3 is inserted into the housing 1, and once the power is supplied. After the start, the power supply holding circuit VK for maintaining the power supply unless the reset switch R is closed is provided.

The piezoelectric buzzer 21 is driven by a periodic voltage pulse, and emits a tone having a tone corresponding to the frequency of the voltage pulse. Since the buzzer / LED driver 29 outputs a periodic voltage pulse signal, it is possible to directly drive the piezoelectric buzzer 21 with the output signal of the buzzer / LED driver 29. Since the sound is emitted with a higher volume as the voltage value is higher, a booster circuit is provided so that the boosted voltage pulse can be applied to the piezoelectric buzzer 21.

Hereinafter, the configuration of the booster circuit will be described. The booster circuit includes a transistor TR that performs a switching operation with an output signal of the buzzer / LED driver 29 and a resonant antenna 2
2 and a part of the coil 22a for preventing the inflow of the current from the diode D1. Resonant antenna 22
The coil 22a is formed of a center-tap type coil, and the electrode terminal 22c is pulled out from an intermediate point of the coil wound in series, and can be used as the two coils L1 and L2. This electrode terminal 22c is connected to the piezoelectric buzzer 21 via the diode D1,
The piezoelectric buzzer 21 and the coil L2 are connected in series.
The piezoelectric buzzer 21 has a configuration in which a dielectric is sandwiched between electrodes and is an electrically capacitive buzzer, so that it can be equivalently regarded as a capacitor. Therefore, a series resonance circuit is formed by the piezoelectric buzzer 21 and the coil L2.

A voltage pulse is output from the buzzer / LED driver 29, and the output voltage pulse is input to the base of a transistor TR connecting the piezoelectric buzzer 21 between the collector and the emitter. When the transistor TR that performs the switching operation by the voltage pulse from the buzzer / LED driver 29 is in the “ON” state, as shown in FIG. 17A, the supply voltage Vcc by the battery V and the ground (GND) are equivalently When the transistor TR is in the "OFF" state, only the coil L2 exists between the supply voltage Vcc and the ground between the supply voltage Vcc and the ground (GND), as shown in FIG. Buzzer 21
And the coil L2 are present in series.

The voltage at both ends of the piezoelectric buzzer 21 is represented by v _c (t),
The current flowing through the coil L2 is i (t), the capacitance of the piezoelectric buzzer 21 is C, the inductance of the coil L2 is L, and the resistance component of the coil L2 is R.
The cycle is T and the duty is 5 as shown in FIG.
When the transistor TR performs a switching operation by outputting a voltage pulse signal of 0%, the transistor TR illustrated in FIG. 17A is in an “ON” state, that is, (−) in FIG.
In the state of T / 2 <t <0),

(Equation 1) And the coil L2 at the time t = 0, that is, at the moment when the transistor TR switches from “ON” to “OFF”.
Current i ₀ flowing through

(Equation 2) Becomes

The state where the transistor TR shown in FIG. 17B is "OFF", that is, (0 <t <T
/ 2), Equation 2 is used as an initial condition,

(Equation 3) Becomes V _c (t) is maximum when sin ωt = 1 in Equation 3, and this peak voltage v _C ^P is, for example, 4 kHz, ie, T kHz, of the frequency of the sound emitted from the piezoelectric buzzer 21.
= 250 μs, R = 100Ω, L = 50 mH, C = 15
If you nF, the v _C ^P = 4.8Vcc. Therefore, the voltage pulse boosted to the power supply voltage Vcc or more is applied to the piezoelectric buzzer 21, and the volume of the sound emitted from the piezoelectric buzzer 21 is further increased.

The coil 22a of the resonance antenna 22 is
The housing 2 having a flat rectangular parallelepiped shape is wound around an axis in the thickness direction so that a change in a magnetic field in the thickness direction can be most efficiently detected.

The circuit having the above-mentioned structure 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 is connected to, for example, a store entrance. The piezoelectric buzzer 21 housed in the housing 2 sounds when a pair of panel-shaped transmitters O as shown in FIG. Have been. 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, in the case described above, the piezoelectric buzzer 21
The process up to the start of sound will be briefly described. First, when the wire unit 3 and the housing 2 are not connected in series because the wire unit 3 is cut or the like, the input side terminal of the wire input circuit 24 rises from the ground potential. When a terminal on the input side of the wire input circuit 24 reaches a set potential or higher, the wire input circuit 24
Is detected as being disconnected.

When the wire input circuit 24 detects a disconnection of the wire unit 3 or the like, it outputs a wire disconnection signal to the switching circuit 25. The input side of the wire input circuit 24 is connected to the ground via a delay capacitor C2, and the contact between the wire unit 3 and the circuit in the housing 2 is intermittent due to vibration applied to the wire unit 3. However, it is possible to prevent the potential on the input side of the wire input circuit 24 from rising rapidly, thereby preventing the wire input circuit 24 from malfunctioning even though the wire unit 3 is not disconnected. ing.

The switching circuit 25 sends a control signal to the oscillating circuit 26 and the counter 27 while receiving the wire cutting signal. While receiving the control signal, the oscillating circuit 26 performs pulse oscillation and the counter 27 oscillates. The number of oscillation pulses of the circuit 26 is counted. Then, when the control signal stops, the oscillation circuit 26 stops the pulse oscillation, the counter 27 stops counting, and resets the pulse count. Each time the counter 27 completes counting the preset number of pulses, the latch circuit 26 and the buzzer / LE
One pulse signal is sent to the D driver 29 as a count completion signal.

While receiving the count completion signal, the buzzer / LED driver 29 causes the piezoelectric buzzer 21 to sound and the LED lamp 20 to emit light. On the other hand, the latch circuit receives the count completion signal of the counter 27 and keeps the switching circuit 25 in the state of receiving the disconnection signal, whereby the switching circuit 25 continues to send control signals to the oscillation circuit 26 and the counter 27. That is, the buzzer / LED driver 29 causes the piezoelectric buzzer 21 to sound and the LED lamp 20 to emit light after the counter 27 completes counting the set number of pulses after the switching circuit 25 receives the disconnection signal. As a result, if the disconnection signal is not received continuously for a certain period of time, the piezoelectric buzzer 2
1 and the LED lamp 20 do not operate, thereby preventing a malfunction due to noise or the like.

After the counter 27 once 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. Therefore, the reset switch R is closed. Until the piezoelectric buzzer 21 emits an intermittent sound in synchronization with the count completion signal of the counter 27, the LED lamp 20 keeps blinking in synchronization with the count completion signal of the counter 27.
When an alarm is given by the LED lamp 20 and the piezoelectric buzzer 21 as described above, the impact is applied to the housing 2 so that the positive electrode or the negative electrode of the battery V is momentarily released from the connection terminal. In such a case, a power supply capacitor C1 for supplementarily supplying a current is provided in parallel with the battery V in order to prevent the circuit in the housing 2 from being reset and the alarm from being stopped. I have.

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

Therefore, the antenna input circuit 23, the switching circuit 25, the oscillating circuit 26, the counter 27, the latch circuit 28, and the buzzer / LED driver 29 receive the radio wave from the transmitter O whose resonance antenna 22 is the sounding command radio wave. Along with this, it functions as sounding control means AO for sounding the piezoelectric buzzer 21, and the piezoelectric buzzer 21 notifies the sounding control means AO, the resonance antenna 22 and the piezoelectric buzzer 21 of the reception of the sounding command radio wave by the resonance antenna 22. This constitutes a radio wave reception notification device. Further, the wire input circuit 24 detects a preparatory act for removing the housing 2 of the sensor tag 1 from the anti-theft object, such as cutting the wire unit 3 or pulling out the wire unit 3, as a preparatory act for theft. It functions as detecting means SD.

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.
It 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, 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, 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 and comes 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 main body of the jack unit 4 so that the direction in which the teeth extend is perpendicular to the direction in which the rack portion 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 rear 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 key K for disengaging has the outer shape shown in FIG. 13 (A), and as shown in FIG. 13 (B) and FIG. 13 (C), in the longitudinal direction with respect to the outer sleeve 61. 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 the inner sleeve 60 that can be immersed in the outer sleeve 61 depends on whether the adjustment cap 62 is tightened on the outer sleeve 61 shown in FIG.
The setting can be changed in two stages with the outer sleeve 61 shown in FIG. 13C being loosened and the adjustment cap 62 being loosened, and the adjustment cap 62 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. Rack section 63
As shown in FIG. 14 (a) when the rack portion 63 is viewed from the tip side and FIG. 14 (b) which is a partial side sectional view of the rack portion 63, the long groove 63a on the rack forming surface side and the opposite from the rack forming surface. It is configured in a specific shape having two concave grooves of the short groove 63b on the side.

The cross-sectional shape of the long groove 63a and the short groove 63b as viewed in the longitudinal direction is the cross-sectional shape of the entrance-side shield wall 45a and the rear-side shield wall 45b formed in the key insertion hole 45 shown in FIG. And the shielding wall 45a on the entrance side is in the long groove 63a, and the shielding wall 45b on the back side is
Are engaged with the short grooves 63b, respectively, so that the rack 63 of the disengaging key K is
And 45b can be inserted into the key insertion hole 45 without being blocked. In addition, the long groove 63a of the rack part 63
Corresponds to the shielding wall 45a on the entrance side of the key insertion hole 45, so that the length of the groove is longer than the short groove 63b corresponding to the shielding wall 45b on the back side.

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.

To release the lock pin 30 only from the lock pin insertion hole 40a near the key insertion hole 45, the adjustment cap 62 is tightened to reduce the amount of insertion of the rack 63 into the key insertion hole 45. 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 raises 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, the rack portion 63 is connected to the pair of reset terminals 47a and 47, as shown in FIG.
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. 2 is operated to release sound by the rack portion 63 of the disengaging key K which is a rod-shaped releasing operation tool inserted into the key insertion hole 45. Functions as means AR. Lock pin insertion hole 4
From the state where the lock pin 30 is pulled out from the position 0a, the lock pin insertion hole 40 is further provided for replacement of the wire unit 3 or the like.
To remove the lock pin 30 inserted in the key b, the rack 63 of 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, as shown in FIG. 7, the convex portion 42a of the lock spring 42 swings so as to retract from the lock pin insertion hole 40b. 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.

[Another embodiment] Hereinafter, another embodiment will be described. In the above embodiment, the present invention is applied to the configuration in which the sensor tag 1 is attached to the anti-theft object by the wire unit 3, but FIGS. 19 (a) and 19 (b).
As shown in (1), the present invention may be applied to a configuration in which the pin 103 is attached by inserting the pin 103 into the housing 2 with a cloth or the like to be stolen. Even in such a configuration, FIG.
2, the detection switch SW is closed as the pin 103 is inserted into the housing 2, and power is started from the battery V to each circuit by the closing operation of the detection switch SW. I can do it.

In the above embodiment, the boosting circuit for boosting the voltage pulse applied to the piezoelectric buzzer 21 is configured as shown in FIG. 2, but may be configured as shown in FIG. 21 or FIG. . In FIGS. 21 and 22, only portions related to the booster circuit are extracted and shown.

The booster circuit shown in FIG.
The coil L2, which is a part of the second coil 22a, and the piezoelectric buzzer 21 form a series resonance circuit, and the voltage pulse applied to the piezoelectric buzzer 21 is boosted. In the circuit shown in FIG. 21, since the resonance antenna 22 is connected to the Vcc side, that is, the positive electrode side of the battery V, the antenna input circuit 23 transmits when the signal from the resonance antenna 22 becomes lower than the set potential. It is configured to detect reception of a sounding command radio wave from the device O.

The booster circuit shown in FIG.
The coil L2, which is a part of the second coil 22a, and the piezoelectric buzzer 21 form a parallel resonance circuit, and the voltage pulse applied to the piezoelectric buzzer 21 is boosted.

In the above-described embodiment and the other embodiment, the boosting circuit is configured by using a part of the coil 22a of the resonance antenna 22, but the boosting circuit may be configured by using the entire coil 22a. good.

In the above embodiment, the piezoelectric buzzer 21 is exemplified as an electrically capacitive buzzer, but various electrostatic speakers may be employed as the buzzer.

In the above embodiment, the alarm release means AR
Is configured such that when the pair of reset terminals 47a and 47b are short-circuited, the alarm release operation state is established, but mechanically interlocks with the insertion of the engagement release key K into the key insertion hole 45. Alternatively, the configuration may be such that the reset switch R is turned on and off.

In the above embodiment, the coil 22 a of the resonance antenna 22 is wound around the axis in the thickness direction of the casing 2 having a flat rectangular parallelepiped shape. Resonant antennas provided with coils wound around a vertical axis may be provided side by side to efficiently detect sounding command radio waves from various directions.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structure of the attached 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 a diagram illustrating the operation of the booster circuit according to the embodiment of the present invention.

FIG. 18 is a diagram illustrating the operation of the booster circuit according to the embodiment of the present invention.

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

FIG. 20 is a circuit configuration diagram according to another embodiment of the present invention.

FIG. 21 is a configuration diagram of a booster circuit according to another embodiment of the present invention.

FIG. 22 is a configuration diagram of a booster circuit according to another embodiment of the present invention.

[Explanation of symbols]

 2 housing 21 buzzer 22 receiving antenna 22a coil 45 insertion hole 63 release operation tool AO sound control means AR sound release means O transmitter SD preliminary action detection means

Continuing from the front page (72) Inventor Masayuki Yao 2-47, Shizitsuhigashi, 1-chome, Namiwa-ku, Osaka-shi, Osaka (72) Inventor Mitsuhiko Nakajima Nakanohara 9608 (72) ) Inventor Yasuhiro Noma 1-7-12 Tsukishima, Chuo-ku, Tokyo (56) References JP-A-62-84700 (JP, A) JP-A-47-28298 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) G08B 13/22-13/26 G08B 13/14 G10K 9/12

Claims (4)

(57) [Claims] 1. A receiving antenna (22) for receiving a radio wave provided with a coil (22a), an electrically capacitive buzzer (21), and a receiving antenna (22) receiving a sounding command radio wave. A radio wave receiving and notifying device (AO) for sounding the buzzer (21), wherein the buzzer (21) and the coil (22a) provided in the receiving antenna (22) are provided. A radio wave reception and notification device which forms a resonance circuit by connecting all or a part thereof. 2. A radio wave receiving and notifying device according to claim 1, wherein said radio wave receiving and notifying device is provided in a housing (2) attached to the anti-theft object, and a transmitter (O) for transmitting a sounding command radio wave to said receiving antenna (22). ) Is an anti-theft device installed at a specific location. 3. The housing (2) is provided with a preliminary action detection means (SD) for detecting a preliminary action for removing the same from the anti-theft object as a theft preliminary action, and the sound control means (AO). 3. The anti-theft device according to claim 2, wherein the buzzer (21) is activated to sound when the preliminary action is detected by the preliminary action detection means (SD). 4. A sound release means (AR) for stopping the operation of said sound control means (AO) inside said housing (2).
A release operation insertion hole (45) is formed from an outer surface of the housing (2) toward the inside of the housing, and a release operation tool inserted into the release operation insertion hole (45). (63) In (63), the sound generation canceling means (AR) is configured to be operated in a sound cancellation state.
Anti-theft device as described.