JPH02253395A - Burglary preventing device - Google Patents

Abstract

PURPOSE:To make the emission of an electromagnetic wave unnecessary, to miniaturize a burglary preventing device, and to surely prevent a burglary by providing an optical sensor, an oscillating sensor, and a line cut sensor which detects the cutting of a member attached to a commodity, etc. CONSTITUTION:A burglary preventing device 2 is attached through an attaching string 3 to be the line cut sensor to a commodity 1, and the burglary preventing device 2 is provided with an optical sensor 5, an oscillating sensor 6, and an alarm circuit 7 inside a main body 4 in a small pendant shape. When light changes from lightness to darkness to attain a specified condition, an oscillation is detected, and the detachment of the device from the commodity is detected by the sensor, an alarm is resin, and the burglary is announced. Thus the burglary can be surely detected, further equipment emitting intense electromagnetic wave is made unnecessary, the device is out of the application range of electric wave law, and the shape of the device can be miniaturized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an anti-theft device for preventing theft of products, etc.
In particular, the present invention relates to an anti-theft device that is small in size and can reliably prevent theft.

(Prior Art) Conventionally, this type of anti-theft device is composed of a tag that is attached to a product, and an electromagnetic or wave emitting device that is installed at a gate or the like and excites the tag. According to this anti-theft device, When a product with a tag attached passes through the gate, an alarm is sounded, thereby preventing theft.Several types of anti-theft devices are available.

The first type of anti-theft device has the following configuration. In other words, the tag attached to the product consists only of a resonator that also serves as an antenna, and the electromagnetic wave emitter installed at the gate can emit strong electromagnetic waves to excite the tag's resonator. , is configured to issue an alarm when a reflected wave from the tag is received.

According to the first type of anti-theft device, when the product passes through the gate, the tag resonates with the electromagnetic waves from the electromagnetic wave emitter and emits reflected waves. is received and an alarm is issued. This makes it possible to prevent products from being taken out without permission.

The second type of anti-theft device has the following configuration. In other words, the tag attached to a product consists of a resonator that also serves as an antenna, a receiver, and a sound generator.
And the electromagnetic wave emitter installed at the gate is simply a powerful t
The resonator of the tag can be excited by emitting magnetic waves.

According to the second anti-theft method, when a product is carried through a gate, the resonator of the tag resonates due to electromagnetic waves from the electromagnetic wave emitter, which activates the receiver and activates the acoustic generator. When activated, the tag will generate sound. This makes it possible to prevent products from being taken out without permission.

The third type of anti-theft device has the following configuration. That is, a tag attached to a product consists of a resonator that also serves as an antenna, a receiver, and a transmitter. In addition, the 1i electromagnetic wave emitter installed in the game can emit strong electromagnetic waves to excite the resonator of the tag. In addition, it is equipped with a radio wave detector.

According to the second method of theft prevention IIl, when a product is passed through the gate with the product in hand, the resonator of the tag resonates due to the electromagnetic waves from the electromagnetic wave emitter. This causes the receiver to operate and the transmitter to operate. Therefore, electromagnetic waves will be emitted from the tag. By detecting this electromagnetic wave with a radio wave detector, unauthorized removal of products can be prevented.

[Problem to be solved by the invention]

According to each of the above-mentioned 118 prevention devices, the electromagnetic wave emitter installed near the gate causes the resonator of the tag to resonate.
It is necessary to emit strong electromagnetic waves.

For this reason, it has the disadvantage that it does not comply with the standards of the revised radio laws and regulations.

Furthermore, according to each of the above-mentioned anti-theft devices, the tag needs to be equipped with an antenna that also serves as a resonator in order to receive electromagnetic waves, but the antenna cannot be miniaturized. The disadvantage is that it cannot be downsized.

The present invention has been made to solve the above-mentioned drawbacks.
To provide an anti-theft device that does not require electromagnetic wave emission, is small-sized, and can reliably prevent theft.

(Means for solving ilff) In order to achieve the above object, the anti-theft device according to the present invention has the following features:
A light sensor detects brightness and darkness of light, a vibration sensor detects vibration, 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. The present invention is characterized by comprising a constant PPrgIM and an alarm circuit that issues an alarm when the detection signal from the vibration sensor detects vibration.

Another theft prevention device according to the present invention that achieves the above object includes a light sensor that detects the brightness of light, a vibration sensor that detects vibration, a disconnection sensor that detects cutting of a member attached to a product, etc. The detection signal from the optical sensor, the detection signal from the vibration sensor, and the detection signal from the disconnection sensor are captured, and the detection signal from the vibration sensor is detected after a certain period of time has elapsed since the detection signal from the optical sensor changed from bright to dark. The present invention is characterized by comprising an alarm circuit that issues an alarm when the signal detects vibration or when the detection signal from the disconnection sensor detects disconnection.

The alarm circuit in the above-mentioned anti-theft device is preferably characterized by including an alarm sound generating circuit that emits the alarm audibly.

The alarm circuit in the anti-theft device desirably includes an alarm radio wave generation circuit that emits the alarm using radio waves.

[Effect]

The anti-theft device of the present invention focuses on the fact that in the case of theft, the product must be taken out by putting it in a pocket of clothes or a bag in your possession, and that when the product is stolen, vibrations are generated to move the product. When the light changes from bright to dark and a certain condition is reached, and vibration is detected, an alarm is issued to notify theft. Therefore, the brightness of the light is detected by a light sensor, the vibration is detected by a vibration sensor,
These are taken into an alarm circuit, and the alarm circuit issues an alarm when the above conditions are detected.

Another anti-theft device of the present invention has the following features: in case of theft, the product must be taken out by putting it in a pocket of clothes or a bag in your possession; when the product is stolen, vibrations are generated to move the product; and We focused on removing unnecessary equipment attached to the equipment and taking it out with us, and when the light changes from bright to dark and a certain condition is reached and vibration is detected,
Furthermore, when a sensor detects that the item has been removed, an alarm is issued to notify the user of theft.

Therefore, the brightness of the light is detected by a light sensor, the vibration is detected by a vibration sensor, the disconnection is detected by a disconnection sensor, and these are taken into the alarm circuit. It is designed to emit.

The alarm circuit may be able to generate an alarm acoustically or may emit an electromagnetic wave.

〔Example〕

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

1 to 4 are diagrams for explaining a first embodiment of the present invention.

Here, FIG. 1 is a perspective view showing a first embodiment of the present invention. FIG. 2 is a block diagram showing the same embodiment.

FIG. 3 is a circuit diagram showing a configuration example of the same embodiment. Fourth
The figure is a time chart for explaining the operation of the same embodiment.

In FIG. 1, an anti-theft device 112 is attached to a product 1 via a string 3, which also serves as a disconnection sensor. Anti-theft I! 2 is a small pendant-shaped main body 4
It is equipped with an optical sensor 5, a vibration sensor 6, and an alarm circuit 7 inside. To install the main body 4, on the opposite side of the paddy 3,
A large number of holes 8 are provided, and the last hole 8 is for emitting sound to the outside.

Theft prevention shown in Figure 2! J2 is composed of an optical sensor 5, a vibration sensor 6, and an alarm circuit 7. 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 that can detect vibration and convert it into an electrical signal.For example, a mercury switch, a reed switch, a magnetic switch, a magnetic flux switch, etc. may be used.A disconnection sensor (attached with string 3) The alarm circuit 7 is composed of a signal processing circuit 9 and a buzzer 10. The signal processing circuit 9 takes in the detection signal from the optical sensor 5, the detection signal from the vibration sensor 6, and the detection signal from the disconnection sensor (installed! 3), and makes sure that the detection signal from the optical sensor 5 is clear. When a certain period of time has passed since the light changes from to dark, and the detection signal from the vibration sensor 6 detects vibration, or when the detection signal from the disconnection sensor (attached to the string 3) detects a disconnection, It is configured to issue a warning by sounding a buzzer 10.

The circuit shown in FIG. 3 shows an example of the configuration of the signal processing circuit 9, and is composed of a light/vibration type signal processing circuit 11 and a disconnection type signal processing circuit 12.

The light/vibration system signal processing circuit 11 includes an optical signal circuit 13, an acoustic drive circuit 14, and a vibration signal circuit 15. The disconnection system signal processing circuit 12 has a sound of 9% movement l514
It has a similar circuit configuration.

The optical signal circuit 13 includes resistors R1 to R9 and a transistor Q.
1 to Q6, capacitors C1 and C2, and diode Di
It is composed of. Transistors Q2, QB, Q5
, the capacitor C1, and the resistor R5 operate to detect and cancel short on-pulses.

Also, transistor Q6, resistor R8, and capacitor C
2, transistor Q7, and diode D3, the time from bright to dark is measured. The long on-pulse is detected and the alarm is canceled by the action of the capacitor C1, resistor R5, diode D1, and transistors Q3 and Q4. The acoustic drive circuit 14 includes a resistor R1O,
R11, transistors Q7, QB, and diode D3
, D4 constitute a Schmitt trigger circuit, and the vibration signal circuit 15, which maintains the off state, is composed of resistors R12 and R13, a capacitor C3, and a transistor Q9.

The disconnection-related signal processing circuit 12 includes resistors R14 to R17, transistors QIO-Q14, and diodes D5 to D7. Further, a Schmitt trigger circuit is constituted by transistors Q13 and Q14 and a diode D5. A string 3 is connected to the terminal Pa5Pb, and is connected by transistors QIO and Qll. A reset switch S- is connected in series to the transistor QLO1Qll.

The operation of this embodiment configured as described above will be explained.

First, if the No. 11 difficulty prevention device 2 is placed in a stationary state, the vibration sensor 6 is off, so the transistor Q9 is turned on and cancels the signal from the optical signal circuit 3. Therefore, the transistor QLO%Qll of the acoustic drive circuit 14 is turned off and does not generate sound.

Next, suppose that product 1 is stolen. At this time, product 1
For example, suppose you put it in your clothes pocket.

Then, as shown in FIG. 4, the vibration sensor 6 is turned on, and the transistor Q9 of the vibration signal circuit 15 is turned off. As a result, the signal from the optical signal circuit 13 is supplied to the acoustic drive circuit 14. At this time, the optical sensor
5 assumes that a dark state has been detected for a certain period of time or more.

Then, transistors Ql and Q2 turn on, and transistors Q3 to Q6 turn off, so if the transistors Q7 and Q remain off for a certain period of time, due to the actions of resistor R8, capacitor C2, transistor Q7, and diode D3, transistors Q7 and Q
B is turned on and the buzzer IO sounds.

This makes it possible to detect that the product 1 has been stolen.

In addition, when the cord 3 is installed as a disconnection sensor, when it is disconnected from the product 1, it connects the resistor R14 to the transistor Q.
Current flows into the base of transistor QIO1Ql.
l is turned on. As a result, transistor Q12 is turned off, and transistors Q13 and Q14 are turned on. As a result, a current flows through the buzzer 10 via the transistor Q14 and the diode D6, and the buzzer 10 generates a sound.

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

FIG. 5 is a block diagram showing a second embodiment of the present invention.

The second embodiment shown in FIG. 5 differs from the first embodiment in that it includes an alarm radio wave generation circuit 20 that outputs electromagnetic waves instead of the buzzer 10, and an antenna 21 that outputs electromagnetic waves from the alarm radio wave generation circuit 20. are provided together with the signal processing circuit 9 to configure the alarm circuit 7A, and there are no other changes in the configuration. Therefore, the same components as in the first embodiment are given the same reference numerals. Give an explanation.

The second embodiment shown in FIG. 5 operates in the same way as the first embodiment and drives the alarm radio wave ordering circuit 20 when theft occurs. As a result, the alarm radio wave generation circuit 20 operates and emits electromagnetic waves from the antenna 21. This electromagnetic wave is detected by a radio wave detector or the like to prevent theft.

As described above, in this embodiment, when a certain period of time has elapsed since the light changed from bright to dark and the device detects vibration from stillness, an alarm is issued as a theft, or when a disconnection is detected by a disconnection sensor. Since the system is designed to issue an alarm, it is possible to reliably detect theft, and there is no need for equipment that emits strong electromagnetic waves, making it exempt from the '11 wave law, and there is no need for a resonator to detect electromagnetic waves. Therefore, the external size can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, when a certain period of time has elapsed since the light changed from bright to dark, and when the device detects vibration from stillness, an alarm is issued indicating theft. Not only can it be detected, but it also eliminates the need for equipment that emits strong electromagnetic waves, making it exempt from the Radio Law, and it also has the effect of being able to be smaller in size because it does not require a W4 device to detect electromagnetic waves. .

Further, according to the present invention, when a certain period of time has elapsed since the light changed from bright to dark, and the device detects vibration from stillness, an alarm is issued for theft, or when a disconnection sensor detects a disconnection, an alarm is issued. This makes it possible to reliably detect theft even if the device is removed from the product, and also eliminates the need for devices that emit strong electromagnetic waves, making them outside the scope of the Radio Law. Since a resonator is not required, the external size can be reduced in size.

Further, according to the present invention, since the alarm is audible, the user can immediately know that the product has been stolen.

In addition, according to the present invention, since the alarm is notified by electromagnetic waves, only the person concerned can know that the product has been stolen, and the necessary measures can be taken.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a block diagram showing the first embodiment, FIG. 3 is a circuit diagram showing the first embodiment, and FIG. 5 is a time chart shown to explain the operation of the second embodiment, and FIG. 5 is a block diagram showing the second embodiment. ! ...Product, 2...Anti-theft device, 3...Installation with string (broken wire sensor), 5...Light sensor-6...Vibration sensor 7.7A...Alarm circuit, 9...・Signal processing circuit,
DESCRIPTION OF SYMBOLS 10... Buzzer, 11... Optical/imaging system signal processing circuit, 12... Disconnection system signal processing circuit, 13... Optical signal circuit, 14... Acoustic drive circuit, 20... Alarm Radio wave generation circuit.

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: an alarm circuit that issues an alarm when a certain period of time has elapsed since the vibration has changed, and a detection signal from a vibration sensor detects vibration. (2) A light sensor that detects the brightness of light, a vibration sensor that detects vibration, a disconnection sensor that detects cutting of a member attached to a product, etc., and a detection signal from the light sensor and a detection signal from the vibration sensor. The signal and the detection signal from the disconnection sensor are captured, and when the detection signal from the optical sensor changes from bright to dark and a certain period of time has elapsed, and the detection signal from the vibration sensor detects vibration, or An anti-theft device comprising an alarm circuit that issues an alarm when a detection signal from a disconnection sensor detects disconnection. (3) The anti-theft device according to claim 1 or 2, wherein the alarm circuit includes an alarm sound generating circuit that emits the alarm audibly. (4) The anti-theft device according to claim 1 or 2, wherein the alarm circuit includes an alarm radio wave generation circuit that issues the alarm using radio waves.