JP2000113338A - Robbery preventing method/device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a robbery preventing method which can stop a criminality for unlocking the robbery prevention object of an automatic vending machine or destroying it on the way. SOLUTION: A photoelectric sensor 6 formed of a light emitting element and a light receiving element is installed by making it cross the insertion direction of the key hole of a lock before locking a robbery prevention object. When an article opening or destroying the lock is inserted into the lock of the robbery prevention object, a controller 7 selectively detects the existence of the article through the photoelectric sensor 6. An alarm sound is stepwise generated from an alarm 9 in accordance with the lapse of time when a criminality operation is continued or repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft method and apparatus for stopping a crime caused by destroying an anti-theft object such as a vending machine.

[0002]

2. Description of the Related Art Conventionally, vending machines have been designed to prevent theft.
There were methods such as a double locking method using a powerful door chain together, a method for generating an alarm using a door switch, and a method for generating an alarm using an impact sensor.

[0003]

With respect to recent vending machine theft, the cost of repairing a vending machine destroyed by a crime and the time required for repairing the vending machine have been increased, not only because the amount of money stolen has increased due to an increase in crimes. The decrease in income due to suspension of sales during this period has become a major problem in the maintenance and management of vending machines.

An object of the present invention is to provide an anti-theft method and apparatus capable of stopping a crime that unlocks or destroys an anti-theft object such as a vending machine.

Another object of the present invention is to provide an anti-theft method and apparatus capable of preventing an offense from being caused by an optically erroneous operation.

Another object of the present invention is to provide an anti-theft device capable of continuing the anti-theft operation even when commercial power to an anti-theft object such as a vending machine is cut off. It is in.

[0007]

Means of the present invention for achieving the above object are as follows.

According to a first aspect of the present invention, in order to achieve the above object, a light emitting element and a light receiving element are traversed in a direction in which a keyhole of the lock is inserted, before the lock of the object to be stolen. When an object that opens or destroys the lock is inserted into the lock of the anti-theft object, the presence of this object is selectively detected via the photoelectric sensor, and the crime operation is continued or repeated. The alarm sound is generated stepwise in response to the passage of time.

According to such an anti-theft method, an alarm is issued stepwise in response to the elapse of time during which a crime operation for opening or destroying a lock is continued or repeated. A warning sound can be heard, so that the crime can be stopped halfway, either spontaneously or by a nearby person rushing.

According to a second aspect of the present invention, in the first aspect, the detection of the object by the photoelectric sensor is performed by synchronizing the light emitting timing of the light emitting element emitting infrared light with the light receiving timing of the light receiving element receiving infrared light. When infrared light is incident on the light-receiving element during the time excluding the light-emission timing time and the light-reception timing time synchronized therewith, it is recognized as a criminal operation and an alarm sound is generated. And

In this manner, it is possible to prevent an offense from being caused by an optically erroneous operation. In addition, when detection is performed using infrared light, at the time of a normal detection operation, natural light enters the light receiving element at a time excluding the time of the light emission timing and the time of the light reception timing synchronized with the time, and the operation is determined to be a crime operation. It is possible to prevent the generation of an alarm sound.

A third aspect of the present invention is a method for preventing theft according to the first or second aspect, wherein the step-by-step generation of the alarm sound is performed by increasing at least the level of the alarm sound stepwise.

When the level of the alarm sound is increased stepwise in this manner, the perpetrator will be afraid of what the volume will be at the end, and the offense can be stopped halfway.

According to a fourth aspect of the present invention, there is provided an anti-theft device comprising: a photoelectric sensor including a light emitting element and a light receiving element which are disposed in front of a lock of an object to be stolen across a direction in which a keyhole of the lock is inserted; When an object that opens or breaks the lock is inserted into the lock of the object to be prevented, the presence of this object is selectively detected via the photoelectric sensor, and the criminal operation is continued or repeated. It is characterized by comprising a control device for generating a stepwise alarm signal programmed in advance, and an alarm device for generating a warning sound stepwise by the stepwise alarm signal from the control device.

According to such an anti-theft device, the photoelectric sensor detects that an object that opens or destroys the lock is inserted into the lock of the anti-theft object, and the control device continues or repeats the crime operation. A step-by-step alarm signal is issued in response to the passage of time, and the alarm emits a step-by-step alarm sound based on the step-by-step alarm signal. The crime can be stopped on the way, either by a person or by a nearby person rushing.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the control device is arranged such that the light receiving element for receiving the infrared light is synchronized with the light receiving element for receiving the infrared light while providing the light emitting element to the light emitting element for emitting the infrared light. It is controlled to perform light reception, and when infrared light is incident on the light receiving element during a time excluding the time of the timing of light emission and light reception, it is configured to be recognized as a criminal operation. .

According to such an anti-theft device, it is possible to prevent a crime by optically malfunctioning. In addition, when detection is performed using infrared light, at the time of a normal detection operation, natural light enters the light receiving element at a time excluding the time of the light emission timing and the time of the light reception timing synchronized with the time, and the operation is determined to be a crime operation. It is possible to prevent the generation of an alarm sound.

According to a sixth aspect of the invention, in the antitheft device according to the fourth or fifth aspect, when a commercial power supply for operating the photoelectric sensor, the control device, and the alarm is cut off, a battery for operating these devices is used. It is characterized by having.

With this configuration, each device can be operated with a battery even when the commercial power is cut off.

[0020]

1 and 2 show an example of an embodiment of the anti-theft device according to the present invention. FIG. 1 is a block diagram showing the configuration of the anti-theft device according to this embodiment. 2 is a cross-sectional view showing the configuration of a photoelectric sensor provided in front of the lock of the anti-theft object.

This anti-theft device is provided with a light emitting element 4 which emits infrared light and which is installed in front of a lock 2 of an anti-theft object 1 such as a vending machine so as to cross the insertion direction of a keyhole 3 of the lock 2.
When an object that opens or destroys the lock 2 of the anti-theft object 1 is inserted into the lock 2 of the anti-theft object 1, the presence of this object is selected via the photoelectric sensor 6. Step-by-step alarm signals, which are pre-programmed in response to the passage of time during which the offense operation is continued or repeated, are level 1 alarm signal, level 2
A control device 7 for generating any of an alarm signal and a level 3 alarm signal, and the control device 7 for generating one of a level 1 alarm signal, a level 2 alarm signal, and a level 3 alarm signal based on the determination result of the control device 7 When a boosting pulse corresponding to the level 1 alarm signal or the level 2 alarm signal is given from the device 7, the voltage is increased to a relatively low boosted voltage, and when a boosting pulse corresponding to the level 3 alarm signal is given, a relatively high boosted voltage is given. And a booster circuit 8 which performs resistance division of each boosted voltage and feeds back to the control device 7 to be controlled to a predetermined voltage level,
An alarm device 9 such as an electronic buzzer for generating an alarm sound, a first driver 10 for generating a low-level alarm sound from the alarm device 9 upon a level 1 alarm signal or a level 2 alarm signal,
A second driver 11 for generating a high-level alarm sound from the alarm device 9 at the time of the level 3 alarm signal, a stop switch 12 installed inside the anti-theft object to stop the operation of the alarm device 9, A battery 13 is provided inside the anti-theft object to operate these devices when a commercial power supply for operating these devices is cut off. The battery 13 is preferably a secondary battery that can be charged, but may be a primary battery that cannot be charged.

Next, an anti-theft method of this embodiment using such an anti-theft device will be described with reference to FIGS. 1, 3 and 4. FIG.

FIG. 3 shows a drive signal output from the control device 7 to drive the light emitting element 4 that emits infrared light. This drive signal outputs a signal of 36.3 KHz at intervals of 200 ms for 7.5 ms.

Similarly, the light receiving element 5 for receiving infrared rays is
6. Synchronize with the light emission time interval 200 mS of the light emitting element 4,
Light is received for a time width of 5 ms.

The light receiving element 5 detects that the infrared signal is interrupted while the light emitting element 4 is emitting light (7.5 mS in 200 mS), and the control device 7 determines that this state is abnormal. That is, the detection of the infrared signal is performed 256 times during the normal time during the light emission of the light emitting element 4, and out of the 256 times, 16
If no light is received more than once, it is determined to be abnormal.

FIGS. 4A to 4D are diagrams showing the generation timing of a stepwise alarm sound which is programmed in advance in response to the lapse of time during which the crime operation is continued or repeated.

Theft object 1 such as a vending machine
When an object to be opened or destroyed is inserted into the lock 2 of FIG. 1, the light-emitting element 4 and the light-receiving element 5 of the photoelectric sensor 6 detect it as described above. The detection signal of the light receiving element 5 is selectively detected by the control device 7 according to the light emission time interval of the light emitting element 4, and it is determined whether the signal is abnormal or normal.

The control device 7 generates one of a level 1 alarm signal, a level 2 alarm signal, and a level 3 alarm signal in response to the lapse of time during which the crime operation is continued or repeated.

The generation of the level 1 alarm signal, the level 2 alarm signal, and the level 3 alarm signal by such a criminal operation, and the operation of the alarm 9 by the above will be described in detail below. (1) When the power is turned on to the anti-theft device, a click sound is emitted, and then, as shown in FIG. 4A, the device enters a standby state after 15 seconds so that the photoelectric sensor 6 and the like can be operated at any time. (2) When the first abnormality is detected by the photoelectric sensor 6 and is input to the control device 7, the control device 7 determines that the level is 1 and issues a level 1 alarm signal as shown in FIG. For 10 seconds, the alarm 9 emits a low-level alarm sound for 10 seconds. (3) If the photoelectric sensor 6 detects the second abnormality within 5 minutes after the generation of the level 1 alarm signal, as shown in FIG. An alarm signal is issued for 10 seconds, whereby the alarm 9 emits a low-level alarm sound for 10 seconds. (4) If no abnormality is detected by the photoelectric sensor 6 for 5 minutes after the generation of the level 1 alarm signal, the process returns to the standby state. (5) If the photoelectric sensor 6 detects the third abnormality within 5 minutes after the generation of the level 2 alarm signal, as shown in FIG. An alarm signal is issued for 30 seconds, whereby the alarm 9 emits a high-level alarm sound for 30 seconds. (6) After the level 2 alarm signal is generated, if no abnormality is detected by the photoelectric sensor 6 for 5 minutes, the process returns to the standby state. (7) After the generation of the level 3 alarm signal, if no abnormality is detected by the photoelectric sensor 6 for 10 minutes, the process returns to the standby state.

Here, the alarm 9 based on the level 1 alarm signal
As shown in FIG. 5, for example, an alarm sound of 577 Hz is output for 443 mS, and then an alarm sound of 916 Hz is output for 28 seconds.
0 ms is output, and this operation is repeated for 10 seconds.

Next, as shown in FIG. 6, the alarm sound of the alarm 9 by the level 2 alarm signal is, for example, 577 Hz (17 Hz).
30μS cycle), shorten the cycle by 10μS every 16 cycles (increase the frequency), the maximum frequency is 13KHz
(76 μS cycle), the frequency is changed stepwise.
When the highest frequency is reached, the frequency returns to 577 Hz again, and this operation is repeated for 10 seconds.

Next, as shown in FIG. 7, the alarm sound of the alarm 9 by the level 3 alarm signal is, for example, 577 Hz (17 Hz).
30μS cycle), shorten the cycle by 10μS every 16 cycles (increase the frequency), the maximum frequency is 13KHz
(76 μS cycle), the frequency is changed stepwise.
When the maximum frequency is reached, the period is extended by 10 μS (decrease the frequency) and changed stepwise to 4.4 KHz (226 μS period). Thereafter, it reciprocates stepwise between 4.4 KHz and 13 KHz. This operation is repeated for 30 seconds.

When the administrator opens the door of the object to be stolen, a low-level alarm is sounded by the level 1 alarm signal. However, after opening the door, the stop switch 12 is turned off, and the next alarm is issued. The sound can be stopped.

When the commercial power supply for operating the anti-theft device is cut off, the battery 1 for operating the anti-theft device is turned off.
3, the antitheft device can be operated by the battery 13 even when the commercial power supply is cut off.

As described above, in the anti-theft method and apparatus according to the present embodiment, an alarm is issued stepwise in response to the elapse of time during which a crime operation for opening or destroying a lock is continued or repeated. In this case, the warning sound can be heard, so that the crime can be stopped midway, either spontaneously or by a nearby person rushing. If the alarm sound is generated stepwise by increasing the level of the alarm sound step by step other than the time for which the alarm sound is maintained, the fear of the culprit at the end of what the volume will be will be. Occurs and the crime can be stopped halfway.

The anti-theft object is not limited to the vending machine, but may be a display case or the like.

[0037]

According to the anti-theft method of the present invention, an alarm sound is output in a stepwise manner in response to the lapse of time during which a crime operation for opening or destroying a lock is continued or repeated. The warning sound can be heard, so that the crime can be stopped halfway, either spontaneously or by a nearby person rushing. For this reason, damage to the anti-theft object destroyed by the crime is reduced, and repair costs and a decrease in income due to suspension of sales during the repair period can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an embodiment of an anti-theft device according to the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a photoelectric sensor provided in front of a lock of an anti-theft object in this example.

FIG. 3 is a waveform diagram of a drive signal output by a control device to drive a light emitting element that emits infrared light in the present example.

4 (A) to 4 (D) show anti-theft devices according to the present embodiment, and show timings of generation of stepwise alarm sounds which are programmed in advance in response to the lapse of time during which a crime operation is repeated. It is.

FIG. 5 is a frequency change timing chart showing a frequency change state of an alarm sound by a level 1 alarm signal in the antitheft device of the present example.

FIG. 6 is a frequency change waveform diagram showing a frequency change state of an alarm sound by a level 2 alarm signal in the anti-theft device of the present example.

FIG. 7 is a frequency change waveform diagram showing a frequency change state of an alarm sound by a level 3 alarm signal in the anti-theft device of the present example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anti-theft object 2 Lock 3 Keyhole 4 Light emitting element 5 Light receiving element 6 Photoelectric sensor 7 Control device 8 Boost circuit 9 Alarm 10 First driver 11 Second driver 12 Stop switch 13 Battery

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[Procedure amendment]

[Submission date] October 29, 1999 (1999.10.
29)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Theft prevention method and device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft method and apparatus for stopping a crime caused by destroying an anti-theft object such as a vending machine.

[0002]

2. Description of the Related Art Conventionally, vending machines have been designed to prevent theft.
There were methods such as a double locking method using a powerful door chain together, a method for generating an alarm using a door switch, and a method for generating an alarm using an impact sensor.

[0003]

With respect to recent vending machine theft, the cost of repairing a vending machine destroyed by a crime and the time required for repairing the vending machine have been increased, not only because the amount of money stolen has increased due to an increase in crimes. The decrease in income due to suspension of sales during this period has become a major problem in the maintenance and management of vending machines.

An object of the present invention is to provide an anti-theft method and apparatus capable of stopping a crime that unlocks or destroys an anti-theft object such as a vending machine.

Another object of the present invention is to provide an anti-theft method and apparatus capable of preventing an offense from being caused by an optically erroneous operation.

Another object of the present invention, even when the commercial power source is disconnected to the theft prevention object, such as vending machines, is to provide an antitheft device which can be continued anti-theft operation .

[0007]

Means of the present invention for achieving the above object are as follows.

According to a first aspect of the present invention, in order to achieve the above object, a light emitting element and a light receiving element are traversed in a direction in which a keyhole of the lock is inserted, before the lock of the object to be stolen. When an object that opens or destroys the lock is inserted into the lock of the anti-theft object, the presence of this object is selectively detected via the photoelectric sensor, and the crime operation is continued or repeated. Warning sound is generated step by step as the time elapses, and the object is detected by the photoelectric sensor.
Is the light emission timing by the light emitting element that emits infrared light.
The light receiving timing by the light receiving element that receives infrared light
In addition to performing synchronization,
At the time excluding the light reception timing time
When infrared light enters the optical element, it is determined to be a criminal operation.
And generating an alarm sound.

According to such an anti-theft method, an alarm is issued stepwise in response to the elapse of time during which a crime operation for opening or destroying a lock is continued or repeated. A warning sound can be heard, so that the crime can be stopped halfway, either spontaneously or by a nearby person rushing. Also, optically wrong
To prevent a crime from being committed.
In addition, if detection is performed using infrared light,
In addition, the light emission timing time and the
Natural light enters the light-receiving element at a time other than the
To prevent audible alarms from being identified as criminal actions
be able to.

[0010] The anti-theft method according to claim 2 is a method for preventing theft.
1, wherein the step-by-step generation of the alarm sound is performed by increasing at least the level of the alarm sound stepwise.

When the level of the alarm sound is increased stepwise in this manner, the perpetrator will be afraid of what the volume will be at the end, and the offense can be stopped halfway.

According to a third aspect of the present invention, there is provided an anti-theft device comprising: a photoelectric sensor including a light emitting element and a light receiving element which are installed in front of a lock of an object to be stolen across a direction in which a keyhole of the lock is inserted; When an object that opens or breaks the lock is inserted into the lock of the object to be prevented, the presence of this object is selectively detected via the photoelectric sensor, and the criminal operation is continued or repeated. A control device that generates a stepwise alarm signal that is programmed in advance, and an alarm that generates an alarm sound in a stepwise manner with the stepwise alarm signal from the control device, and the control device includes: Infrared emission
While emitting a light emission signal to the light emitting element
When the light receiving elements that receive light do not receive light synchronously,
Is the time excluding these emission and reception timing times
In addition, when infrared light enters the light receiving element,
The feature is that it is certified.

According to such an anti-theft device, the photoelectric sensor detects that an object that opens or destroys the lock is inserted into the lock of the anti-theft object, and the control device continues or repeats the crime operation. A step-by-step alarm signal is issued in response to the passage of time, and the alarm emits a step-by-step alarm sound based on the step-by-step alarm signal. The crime can be stopped on the way, either by a person or by a nearby person rushing. In addition, crimes are committed by optically malfunctioning
Detection using infrared rays.
During normal detection operation,
The time excluding the time of the light reception timing synchronized with the
Natural light is incident on the light receiving element and it is recognized as a crime operation and an alarm sound
Can be prevented from occurring.

[0014] The anti-theft device according to claim 4 is the same as the claim.
3, wherein a battery for operating these devices is provided when commercial power for operating the photoelectric sensor, the control device, and the alarm is cut off.

With this configuration, each device can be operated with a battery even when the commercial power supply is cut off.

[0016]

1 and 2 show an example of an embodiment of the anti-theft device according to the present invention. FIG. 1 is a block diagram showing the configuration of the anti-theft device according to this embodiment. 2 is a cross-sectional view showing the configuration of a photoelectric sensor provided in front of the lock of the anti-theft object.

This anti-theft device is provided with a light emitting element 4 which emits infrared light and is installed in front of a lock 2 of an anti-theft object 1 such as a vending machine, which is installed in a direction in which a keyhole 3 of the lock 2 is inserted.
When an object that opens or destroys the lock 2 of the anti-theft object 1 is inserted into the lock 2 of the anti-theft object 1, the presence of this object is selected via the photoelectric sensor 6. Step-by-step alarm signals, which are pre-programmed in response to the passage of time during which the offense operation is continued or repeated, are level 1 alarm signal, level 2
A control device 7 for generating any of an alarm signal and a level 3 alarm signal, and the control device 7 for generating one of a level 1 alarm signal, a level 2 alarm signal, and a level 3 alarm signal based on the determination result of the control device 7 When a boosting pulse corresponding to the level 1 alarm signal or the level 2 alarm signal is given from the device 7, the voltage is increased to a relatively low boosted voltage, and when a boosting pulse corresponding to the level 3 alarm signal is given, a relatively high boosted voltage is given. And a booster circuit 8 which performs resistance division of each boosted voltage and feeds back to the control device 7 to be controlled to a predetermined voltage level,
An alarm device 9 such as an electronic buzzer for generating an alarm sound, a first driver 10 for generating a low-level alarm sound from the alarm device 9 upon a level 1 alarm signal or a level 2 alarm signal,
A second driver 11 for generating a high-level alarm sound from the alarm device 9 at the time of the level 3 alarm signal, a stop switch 12 installed inside the anti-theft object to stop the operation of the alarm device 9, A battery 13 is provided inside the anti-theft object to operate these devices when a commercial power supply for operating these devices is cut off. The battery 13 is preferably a secondary battery that can be charged, but may be a primary battery that cannot be charged.

Next, an anti-theft method of this embodiment using such an anti-theft device will be described with reference to FIGS. 1, 3 and 4. FIG.

FIG. 3 shows a drive signal output from the control device 7 to drive the light emitting element 4 that emits infrared light. This drive signal outputs a signal of 36.3 KHz at intervals of 200 ms for 7.5 ms.

Therefore, in a normal state, the light receiving element 5 for receiving the infrared rays has a light emitting time interval of 200 ms for the light emitting element 4.
In synchronization with, it decided to receiving only time width of 7.5mS
You .

The light receiving element 5 detects that the infrared signal has been interrupted while the light emitting element 4 is emitting light,
Determines that this state is abnormal. That is, the detection of the infrared signal is performed 256 times during the normal time while the light emitting element 4 emits light. If the light is not received 16 times or more out of the 256 times, it is determined to be abnormal.

As described above, the detection of an object by the photoelectric sensor
Is performed by measuring the number of times light is received in synchronization with light emission.

Further , the control device 7 operates at the time of light emission timing.
Time excluding the time of the light reception timing synchronized with
Also, when infrared light is incident on the light receiving element 5, it is determined that there is an abnormality.
Set.

FIGS. 4 (A) to 4 (D) are diagrams showing the generation timing of the stepwise alarm sound which is programmed in advance in response to the lapse of time during which the crime operation is continued or repeated.

The thief is the object 1 of theft prevention such as a vending machine
When an object to be opened or destroyed is inserted into the lock 2 of FIG. 1, the light-emitting element 4 and the light-receiving element 5 of the photoelectric sensor 6 detect it as described above. The detection signal of the light receiving element 5 is selectively detected by the control device 7 according to the light emission time interval of the light emitting element 4, and it is determined whether the signal is abnormal or normal.

The control device 7 generates one of a level 1 alarm signal, a level 2 alarm signal, and a level 3 alarm signal in response to the lapse of time during which the crime operation is continued or repeated.

The generation of the level 1 alarm signal, the level 2 alarm signal, and the level 3 alarm signal by such a criminal operation, and the operation of the alarm 9 by the operation will be described in detail below. (1) When the power is turned on to the anti-theft device, a click sound is emitted, and then, as shown in FIG. 4A, the device enters a standby state after 15 seconds so that the photoelectric sensor 6 and the like can be operated at any time. (2) When the first abnormality is detected by the photoelectric sensor 6 and is input to the control device 7, the control device 7 determines that the level is 1 and issues a level 1 alarm signal as shown in FIG. For 10 seconds, the alarm 9 emits a low-level alarm sound for 10 seconds. (3) If the photoelectric sensor 6 detects the second abnormality within 5 minutes after the generation of the level 1 alarm signal, as shown in FIG. An alarm signal is issued for 10 seconds, whereby the alarm 9 emits a low-level alarm sound for 10 seconds. (4) If no abnormality is detected by the photoelectric sensor 6 for 5 minutes after the generation of the level 1 alarm signal, the process returns to the standby state. (5) If the photoelectric sensor 6 detects the third abnormality within 5 minutes after the generation of the level 2 alarm signal, as shown in FIG. An alarm signal is issued for 30 seconds, whereby the alarm 9 emits a high-level alarm sound for 30 seconds. (6) After the level 2 alarm signal is generated, if the abnormality is not detected by the photoelectric sensor 6 for 5 minutes, the process returns to the standby state. (7) After the level 3 alarm signal is generated, if the abnormality is not detected by the photoelectric sensor 6 for 10 minutes, the process returns to the standby state.

Here, the alarm 9 using the level 1 alarm signal
As shown in FIG. 5, for example, an alarm sound of 577 Hz is output for 443 mS, and then an alarm sound of 916 Hz is output for 28 seconds.
0 ms is output, and this operation is repeated for 10 seconds.

Next, as shown in FIG. 6, the alarm sound of the alarm 9 by the level 2 alarm signal is, for example, 577 Hz (17 Hz).
30μS cycle), shorten the cycle by 10μS every 16 cycles (increase the frequency), the maximum frequency is 13KHz
(76 μS cycle), the frequency is changed stepwise.
When the highest frequency is reached, the frequency returns to 577 Hz again, and this operation is repeated for 10 seconds.

Next, as shown in FIG. 7, the alarm sound of the alarm 9 by the level 3 alarm signal is, for example, 577 Hz (17 Hz).
30μS cycle), shorten the cycle by 10μS every 16 cycles (increase the frequency), the maximum frequency is 13KHz
(76 μS cycle), the frequency is changed stepwise.
When the maximum frequency is reached, the period is extended by 10 μS (decrease the frequency) and changed stepwise to 4.4 KHz (226 μS period). Thereafter, it reciprocates stepwise between 4.4 KHz and 13 KHz. This operation is repeated for 30 seconds.

When the administrator opens the door of the object to be stolen, a low-level audible alarm is sounded by the level 1 alarm signal, but by opening the door and turning off the stop switch 12, the next alarm is issued. The sound can be stopped.

When the commercial power supply for operating the anti-theft device is cut off, the battery 1 for operating the anti-theft device is turned off.
3, the antitheft device can be operated by the battery 13 even when the commercial power supply is cut off.

As described above, in the anti-theft method and apparatus according to the present embodiment, the audible alarm is output stepwise in response to the elapse of time during which the crime operation for opening or destroying the lock is continued or repeated. In this case, the warning sound can be heard, so that the crime can be stopped midway, either spontaneously or by a nearby person rushing. If the alarm sound is generated stepwise by increasing the level of the alarm sound step by step other than the time for which the alarm sound is maintained, the fear of the culprit at the end of what the volume will be will be. Occurs and the crime can be stopped halfway.

The anti-theft object is not limited to a vending machine, but may be a display case or the like.

[0035]

According to the anti-theft method of the present invention, an alarm sound is output in a stepwise manner in response to the lapse of time during which a crime operation for opening or destroying a lock is continued or repeated. The warning sound can be heard, so that the crime can be stopped halfway, either spontaneously or by a nearby person rushing. For this reason, damage to the anti-theft object destroyed by the crime is reduced, and repair costs and a decrease in income due to suspension of sales during the repair period can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an embodiment of an anti-theft device according to the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a photoelectric sensor provided in front of a lock of an anti-theft object in this example.

FIG. 3 is a waveform diagram of a drive signal output by a control device to drive a light emitting element that emits infrared light in the present example.

4 (A) to 4 (D) show anti-theft devices according to the present embodiment, and show timings of generation of stepwise alarm sounds which are programmed in advance in response to the lapse of time during which a crime operation is repeated. It is.

FIG. 5 is a frequency change timing chart showing a frequency change state of an alarm sound by a level 1 alarm signal in the antitheft device of the present example.

FIG. 6 is a frequency change waveform diagram showing a frequency change state of an alarm sound by a level 2 alarm signal in the anti-theft device of the present example.

FIG. 7 is a frequency change waveform diagram showing a frequency change state of an alarm sound by a level 3 alarm signal in the antitheft device of the present example.

[Description of Signs] 1 Anti-theft object 2 Lock 3 Keyhole 4 Light emitting element 5 Light receiving element 6 Photoelectric sensor 7 Control device 8 Booster circuit 9 Alarm 10 First driver 11 Second driver 12 Stop switch 13 Battery

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G08B 23/00 520 G08B 23/00 520B F term (reference) 2G065 AB02 AB23 AB28 BA01 BC02 BC22 BD06 DA03 DA15 5C084 AA03 AA10 BB33 CC07 CC13 DD52 EE02 GG03 GG13 GG19 GG32 GG39 GG44 GG56 GG57 GG68 GG73 HH03 5C087 AA33 AA34 AA42 DD05 DD33 EE14 FF01 FF04 FF13 GG13 GG21 GG29 GG30 GG31 GG51 GG57 GG66 GG90

Claims (6)

[Claims] 1. A photoelectric sensor comprising a light-emitting element and a light-receiving element is provided in front of a lock of an object to be burglar-proofed across a direction in which a keyhole of the lock is inserted. When an object that opens or breaks is inserted, the presence of this object is selectively detected via the photoelectric sensor, and an audible alarm is given in a stepwise manner in response to the lapse of time during which the criminal operation is continued or repeated. An anti-theft method characterized by causing the theft. 2. The detection of the object by the photoelectric sensor,
Performed by synchronizing the light emission timing of the light emitting element that emits infrared light and the light reception timing of the light receiving element that receives infrared light, to a time excluding the time of the light emission timing and the time of the light reception timing synchronized with this. 2. The anti-theft method according to claim 1, wherein when an infrared ray is incident on the light receiving element, an alarm sound is generated in response to a crime operation. 3. The anti-theft method according to claim 1, wherein the step-by-step generation of the alarm sound is performed by increasing at least the level of the alarm sound stepwise. 4. A photoelectric sensor comprising a light-emitting element and a light-receiving element installed in front of the lock of the object to be stolen across the insertion direction of the keyhole of the lock, and When an object to be opened or destroyed is inserted, the presence of the object is selectively detected via the photoelectric sensor, and a pre-programmed step is performed in response to the lapse of time during which the criminal operation is continued or repeated. An anti-theft device comprising: a control device for generating a general alarm signal; and an alarm device for generating an alarm sound in a stepwise manner based on a stepwise alarm signal from the control device. 5. The control device controls so that the light-receiving elements that receive infrared light receive light in synchronization with the light-emitting elements that emit infrared light, while giving a light-emitting signal to the light-emitting elements. The anti-theft device according to claim 4, characterized in that when infrared light is incident on the light receiving element during a time excluding the time of the light receiving timing and the time of receiving light, it is determined to be a criminal operation. 6. A battery according to claim 4, further comprising a battery for operating said photoelectric sensor, said control device, and said alarm when said commercial power source is turned off. The anti-theft device according to 1.