JPH03154197A - Vibration sensor for burglar preventing machine - Google Patents

Abstract

PURPOSE:To securely detect vibration with simple structure at low cost by composing a vibration sensor of a movable body to be moved corresponding to the vibration and a detection body to detect the movability of the movable body. CONSTITUTION:A movable body 16 is attached to a shaft 20, which plants one end of a bar-shaped body 18 to a base 19, so as to be turned, and a conducting material 21 is provided at the other end of the bar-shaped body 18. Then, the bar-shaped body 18 can be returned to a fixed position by a coil spring 22. For a detection body 17, a U-shaped stopper 23 is fixed on an insulating panel 24 on the base 19 and the conducting member 21 is loosely fit into the U-shaped part of the stopper 23. When cut-risers 25 and 25 of the stopper 23 come to the turn radial position of the conducting member 21, the vibration is electrically detected since the conducting member 21 gets contact with the cut risers 25 and 25 of the stopper 23. Thus, the vibration sensor of a robbery preventing machine is obtained with simple structure at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration sensor used in an anti-theft device for preventing theft of products, and particularly to a vibration sensor that is inexpensive and has a simple structure.

[Conventional technology]

Conventional theft prevention devices generally include a tag attached to a product and an electromagnetic wave emitting device installed at a gate or the like to excite the tag. According to the anti-theft device having such a configuration, when a product with a tag attached passes through the gate, an alarm is issued, thereby preventing theft.

According to this anti-theft device, the electromagnetic wave emitter installed near the gate needs to emit strong electromagnetic waves in order to cause the tag's resonator to resonate. The drawback is that it does not meet that standard.

Further, according to the above-mentioned anti-theft device, in order to receive electromagnetic waves, the tag needs to be provided with an antenna that also serves as a resonator, but the antenna cannot be miniaturized, so the entire tag must be miniaturized. The disadvantage is that it cannot be done.

In order to eliminate the drawbacks of each of the above methods, the present inventor proposed and filed an application for a miniaturized anti-theft device that does not use electromagnetic waves.The anti-theft device proposed by the present inventor basically uses light The device detects vibrations and detects theft, and when certain conditions are met, it determines that the vehicle has been stolen and issues an alarm. Therefore, the anti-theft device proposed by the present inventor requires a light sensor and a vibration sensor.

[Problem to be solved by the invention]

However, the main problem that the inventor faced when proposing the anti-theft device was the vibration sensor. Although it is sufficient to detect vibration electrically as the vibration sensor, in reality, there are few sensors that are suitable for this purpose.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a vibration sensor for an anti-theft device that is inexpensive and has a simple structure.

[Means to solve the problem]

In order to achieve the above object, the vibration sensor of the anti-theft device according to the present invention includes a light sensor that detects the brightness of light, a vibration sensor that detects vibration, and a detection signal from the light sensor and a vibration sensor from the vibration sensor. Take in the detection signal,
An anti-theft device comprising an alarm circuit that issues an alarm when the detection signal from the optical sensor changes from bright to dark for a certain period of time and the detection signal from the vibration sensor detects vibration, It is characterized by comprising a movable body that moves in response to vibrations and a detection body that detects the movement of the movable body.

Here, in the vibration sensor, the movable body is rotatably attached to one end of a rod-shaped body, and a conductive member is provided at the other end of the rod-shaped body, and the detection body is attached to the other end of the rod-shaped body. A stopper may be provided by a conductive member at a rotation radius position of the conductive member.

Further, in the vibration sensor, the movable body is rotatably pivoted at one end of a rod-shaped body, a magnetic body is provided at the other end of the rod-shaped body, and the detection body is connected to the magnetic body at the other end of the rod-shaped body. A detection coil may be provided at the rotation radius position.

Further, in the vibration sensor, the movable body is rotatably attached to a disc, a magnetic material is provided on the outer periphery of the disc, the center of gravity of the disc is displaced, and the detection body is A detection coil may be provided on the outer peripheral surface of a magnetic body provided on the disc.

(Function) With the theft prevention device of the present invention, in the case of theft, the perpetrator must always put the product in a pocket of clothes or a bag in their possession and take it out, and when the product is stolen, vibrations are generated to move the product. Focusing on this, when the light changes from bright to dark and reaches a certain condition and vibration is detected, an alarm is issued to notify theft. A light sensor detects vibrations, a vibration sensor detects vibrations, these are taken into an alarm circuit, and the alarm circuit issues an alarm when the above conditions are detected.

The vibration sensor used in the anti-theft device is provided with a movable body that moves in response to vibrations, and the detection body detects the movement of the movable body. Therefore, the structure is simple and vibrations can be detected reliably.

〔Example] Embodiments of the present invention will be described below based on the drawings.

1st TgJ to FIG. 7 are diagrams for explaining the first embodiment of the present invention.

Here, FIG. 1 is a perspective view showing a specific usage example of an anti-theft device to which a first embodiment of the present invention is applied. FIG. 2 is a perspective view of an anti-theft device to which the same embodiment is applied. Third
The figure is a perspective view showing a specific example of the embodiment.

In FIG. 1, a clear case 2 is fixed above the anti-theft device 1, and a product 3 such as a compact disc (CD) can be stored inside the clear case 2. At the upper part of the anti-theft device 1 as shown in the figure and inside the clear case 2, the operating section of the microswitch 4 is exposed. While the operation part of this microswitch 4 is pressed down by the product 3, the anti-theft device 1 does not issue an alarm, and conversely, when the product 3 is removed from the clear case 2 while the anti-theft operation is in progress, the anti-theft device l does not issue an alarm. Aircraft 1 will issue a warning. Further, an optical sensor 5 is provided on the side surface of the anti-theft device 1. Although not shown, a battery operation hole and another optical sensor 5 are provided on the side opposite to the optical sensor 5.

FIG. 2 is a perspective view showing the arrangement of the main components constituting the anti-theft device 1, in which a light sensor 5 is provided on the short side 7 of the rectangular case 6, and the long side 8 is provided with the optical sensor 5. The operating section of the microswitch 4 is exposed to the outside. The side surface 9 opposite to the short side surface 7 is provided with an operation hole 12 for inserting the button battery 10 into the battery holder 11 as shown by the arrow a in the figure and removing it as shown by the arrow in the figure. ing. Note that when the battery 10 is inserted into the battery holder 11, the anti-theft device 1 becomes operational. In addition, operation hole 12
An optical sensor 5 is provided next to the . A vibration sensor 13 is provided adjacent to the battery holder 11. Above this vibration sensor 13, an IC 14 for processing the operation is provided, and an electronic buzzer 15 for alarm is also provided.

FIG. 3 shows a detailed configuration of the vibration sensor 13, and the vibration sensor 13 is composed of a movable body 16 that moves in response to vibration, and a detection body 17 that detects the movement of the movable body 16. The movable body 16 has one end of a rod-shaped body 18 rotatably attached to a shaft 20 implanted in a base 19, and a conductive member 21 is provided at the other end of the rod-shaped body 18. It is configured such that it is returned to a fixed position by a coil spring 22. In addition, the detection body 17 has a stopper 23 formed in a 0-shape made of a conductive member fixed onto an insulating plate 24 on the base 19, and a conductive member 21 loosely fitted into the U-shape of the stopper 23. At the same time, by positioning the upright pieces 25, 25 of the stopper 23 at the radius of rotation of the conductive member 21, the stopper functions as a detection electrode. The vibration sensor 13 can electrically detect vibrations when the conductive member 21 of the rod-shaped body 18 comes into contact with the upright pieces 25, 25 of the stopper 23.

FIG. 4 is a block diagram showing a circuit example of the theft prevention Ill, which includes the microswitch 4 and the optical sensor.
5, a vibration sensor 13, and an alarm circuit 30. The optical sensor 5 has a structure capable of detecting the brightness of light and converting it into an electrical signal, and includes, for example, a photodiode, a phototransistor, a solar cell, and the like. The vibration sensor 6 has a structure capable of detecting vibration and converting it into an electric signal, and the structure shown in FIG. 3 is used. The microswitch 4 makes it possible to electrically detect that the product 3 has been taken out from the clear case 2. The alarm circuit 7 includes a signal processing circuit 31 and an electronic buzzer 15. The signal processing circuit 31 is
For example, the sensor receives a detection signal from the optical sensor 5, a detection signal from the vibration sensor 6, and a detection signal from the microswitch 4, and drives the electronic buzzer 15 when a predetermined condition is met. The signal processing circuit 31 sounds the electronic buzzer 15 or clears the signal using the microswitch 4 when a certain period of time has elapsed since the detection signal from the optical sensor 5 changed from bright to dark and when vibration is detected by the vibration sensor 13. When a product 3 is removed from a case 2, an electronic buzzer 15 is sounded to issue an alarm.

FIG. 5 shows a specific configuration example of the signal processing circuit 31, which includes a vibration signal processing circuit 32 that processes the detection signal from the vibration sensor 13, and a vibration signal processing circuit 32 that processes the detection signal from the optical sensor 5. A timer circuit 34 outputs the noise removal circuit 33 that removes frequency components when the output signal from the noise removal circuit 33 remains for a certain period of time.
and a timer circuit 34 or microswitch 4
and a drive circuit 35 that receives the signal and drives the electronic buzzer 15.

The vibration signal processing circuit 32 includes a power switching circuit consisting of transistors T and 0, a resistor R0, and a diode D, and transistors T□ to T r @ % diode DI.
~D8, a capacitor C3, a resistor RI"' Rs, an amplifier circuit Q, and a holding circuit that keeps the power switching circuit in an on state for a certain period of time.

The noise removal circuit 33 includes optical sensors 5, 5 and an input resistor R.
an amplifier circuit Q2 that takes in the photodetection signal from the connection point of the series circuit with the amplifier circuit Q2; and a low-pass filter that cuts noise from the output signal from the amplifier circuit Q8 using the resistor R7, the capacitor C2, the diode D3, and the AND circuit Q. Consists of.

The timer circuit 34 consists of an input amplifying section composed of input resistors R1 to R, and a transistor Tr3, and a delay circuit composed of a resistor R0, a diode D4, a capacitor Cs, and an AND circuit Q4, and has a time period of, for example, 3.5 seconds. If the input is still "1" even after the elapse of the period, an output is output from the AND circuit Q4.

The drive circuit 35 includes an electronic buzzer switch circuit including an input resistor R11 and a drive transistor T'rs, and a resistor R1.
1 to R14, transistor T P4, diode D4
and a holding circuit that maintains the electronic buzzer switch circuit in the on state.

The operation of the anti-theft device configured as described above will be explained with reference to FIGS. 1 to 7.

FIG. 6 is a diagram simply showing the flow of operation of the anti-theft device 1. As shown in FIG. FIG. 7 is a time chart showing the operation of the anti-theft device 1.

First, if the anti-theft device 1 is placed in a stationary state, the vibration sensor 13 is off, so the transistor TP is off. Therefore, the vibration signal processing circuit 32, the noise removal circuit 33, and the timer circuit 3
4 is not supplied with power from the button battery IO, so the circuit does not operate.

However, when the product 3 is removed from the clear case 2 of the anti-theft device 1, the micro switch 4 is turned on, and from then on, the resistance R
A holding circuit including transistors 11 to R0, a transistor TF4, and a diode D4 keeps the transistor TFS on. Therefore, the electronic buzzer 15 continues to emit a sound even if the product 3 is returned to the clear case 2 (see Fig. 6).
9), (see 0).

Next, assume that the product 3 is stolen while it is stored in the clear case 2 of the anti-theft device 1. At this time, it is assumed that the product 3 is placed in a pocket of clothing, for example. In order to achieve such a state, when vibration is normally accompanied by vibration, and this vibration is detected by the vibration sensor 13 (see FIG. 6(a)), the transistor T2 is turned on and the vibration signal processing circuit 32 and below are turned on. Power is supplied to the circuit from the button battery IO. At the same time, the vibration signal processing circuit 32 continues to output "1" for a certain period of time (for example, 15 seconds here) from the time when the "transistor Tel is turned on and the vibration sensor 13 is turned off." In such a state, the transistor Tr2 is turned on, the transistor Trl is turned on, and power is continued to be supplied to the vibration signal processing circuit 32 to the timer circuit 34 (see FIG. 6 (b)).
When light is detected by the optical sensor 5 (Fig. 6 (
(see C)), the noise is removed from the detection signal by the noise removal circuit 33 (see FIG. 6 (b)), and the detection signal is sent to the timer circuit 34.
However, since the light is being detected, the timer circuit 34 does not operate. , this is detected by the optical sensor 5 (see FIG. 6(C)), and when the dark state is detected for a certain period of time, the timer circuit 34 operates and the drive circuit 35
As a result, in the drive circuit 35, the transistor TrS is turned on, and the transistor TP4 is turned on, so that from then on, no matter what the above state is, Regardless, the electronic buzzer 15 continues to sound (see Figure 6 (b)).

In this way, the present embodiment operates to notify theft etc. by sound.

FIGS. 8 and 9 are diagrams showing a second embodiment of the vibration sensor according to the present invention.

FIG. 8 is a perspective view showing a second embodiment of the vibration sensor.

The second embodiment shown in FIG. 8 differs from the first embodiment in the following points.

That is, in the movable body 16, one end of a rod-shaped body 38 is rotatably attached to a shaft 40 installed from a base 39, a magnetic body 41 is provided at the other end of the rod-shaped body 38, and the rod-shaped body 38 is It is configured such that it is biased by a coil spring 42 so that it always returns to a fixed position. Further, the detection body 17 is a rod-shaped body 38
A detection coil 43 is provided at the rotation radius of the magnetic body 41 at the other end.

As a result, when the magnetic body 41 crosses the detection coil 43,
Since an electromotive force is generated in the detection coil 43, this is used to detect vibrations.

FIG. 9 is a circuit diagram showing an example of the configuration of the detection circuit, in which the detection coil 42 is divided into two parts, and the midpoint Cm is located at the button battery 10.
The other ends PSM are grounded through resistors R8 and R4, respectively, and the other ends P and M are input to a differential amplifier circuit 45, and the output of the differential amplifier circuit 45 is connected to a Schmitt trigger. It is input to the circuit 46 to detect vibrations. The output of this Schmitt trigger circuit 46 may be used as an input signal to the vibration signal processing circuit 32 shown in FIG.

FIG. 1θ is a perspective view showing still another embodiment of the vibration sensor 13.

The third embodiment shown in FIG. 10 differs from the second embodiment shown in FIG. 8 in the following points. That is, the movable body 1
6, a disk 48 is rotatably attached to a shaft 50 installed at the bottom of a base 49 which also serves as a cover, and a magnetic material 51 is provided on the outer periphery of this disk 48. A weight 52 is provided to displace the center of gravity of the magnetic body 51 so that the magnetic body 51 always returns to a constant position. Also,
The detection body 17 is composed of a detection coil 52 provided on the cover of the base 49 on the outer periphery of the disc 48 .

Vibration can also be detected by the vibration sensor 13 configured in this manner. When using this embodiment, the ninth
The detection circuit shown in the figure can be used.

As mentioned above, the anti-theft device 1 has a vibration sensor 1.
When a vibration is detected by 3, the light changes from bright to dark by optical sensor 5 and a certain period of time elapses to issue an alarm as a theft, or micro switch 4 issues an alarm when product 3 is removed from clear case 2. This makes it possible to reliably detect theft, eliminates the need for equipment that emits strong electromagnetic waves, making it exempt from the Radio Law, and eliminates the need for a resonator to detect electromagnetic waves, so the external design can be reduced. Can be made smaller.

The vibration sensor 13 used in the anti-theft device 1 has a simple configuration and can reliably detect vibrations.

(Effects of the Invention) As described above, according to the vibration sensor of the present invention, the vibration sensor is composed of a movable body that moves in response to vibration and a detection body that detects the movement of the movable body. Vibration can be detected reliably with an inexpensive and simple structure.

Further, according to the vibration sensor of the present invention, one end of the rod-like body is rotatably attached to the shaft, a conductive member is provided at the other end of the rod-like body, and the conductive member is located at the rotation radius position of the conductive member at the other end of the rod-like body. Since the stopper is made of a conductive member, the mechanism is simple.

Further, according to the present invention, one end of the rod-shaped body is rotatably attached to the shaft, a magnetic body is provided at the other end of the rod-shaped body, and a detection coil is provided at the rotation radius position of the magnetic body, so that contact can be made. Vibration can be detected without any vibration.

In addition, according to the vibration sensor of the present invention, a disk is rotatably attached to a shaft, a magnetic material is provided on the outer peripheral edge of the disk, and a detection coil is provided on the outer peripheral surface of the magnetic material provided on the disk. So,
Vibration detection becomes smoother.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an anti-theft device to which a first embodiment of the present invention is applied, FIG. 2 is a block diagram showing the entire anti-theft device, and FIG. 3 is a first embodiment of the present invention. FIG. 4 is a block diagram showing an example of the circuit configuration of an anti-theft device, and FIG. 5 is a perspective view showing an example.
The figure is a circuit diagram showing a specific example of the circuit configuration, FIG. 6 is an explanatory diagram for explaining the operation of the anti-theft device, FIG. 7 is a time chart for explaining the operation of the anti-theft device, and FIG. 8 9 is a perspective view showing a second embodiment of the present invention, FIG. 9 is a circuit diagram showing a detection circuit of the second embodiment, and FIG. 10 is a perspective view showing a third embodiment of the present invention. 1... Anti-theft device, 2... Clear case, 3...
Product, 4...Micro switch, 5...Light sensor
, 18, 38... Rod-shaped body, 19.39... Base, 2
0.40.50. ...shaft, 21...11 member, 22
．． 42...Coil spring, 23...Stopper 43.
52...Detection coil, 53...Weight.

Claims (4)

[Claims] (1) A light sensor that detects the brightness of light, a vibration sensor that detects vibration, and a detection signal from the light sensor and a detection signal from the vibration sensor are captured, and the detection signal from the light sensor changes from bright to dark. An anti-theft device comprising: a movable body that moves in response to vibration; A vibration sensor comprising a detection body that detects movement of the movable body. (2) The movable body has one end of a rod-shaped body rotatably attached to the shaft, and a conductive member is provided at the other end of the rod-shaped body, and the detection body is configured to connect the conductive member at the other end of the rod-shaped body. 2. The vibration sensor according to claim 1, further comprising a stopper made of a conductive member at a rotation radius position. (3) The movable body has one end of a rod-shaped body rotatably attached to the shaft, and a magnetic body is provided at the other end of the rod-shaped body, and the detection body is configured to connect the magnetic body at the other end of the rod-shaped body. 2. The vibration sensor according to claim 1, further comprising a detection coil provided at a rotation radius position. (4) The movable body has a disk rotatably attached to the shaft, a magnetic material is provided on the outer periphery of the disk, and the center of gravity of the disk is displaced; 2. The vibration sensor according to claim 1, wherein a detection coil is provided on the outer peripheral surface of a magnetic body provided on a disk.