Antitheft system and antitheft apparatus

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TECHNICAL FIELD

This invention relates to a system for preventing theft in a secure area such as a bank-vault. More particularly, the present invention relates to a system for subduing an intruder by cutting off his field of vision by utilizing smoke, and which prevents theft.

The present invention relates also to a antitheft apparatus and more particularly, to a antitheft apparatus for preventing theft by cutting off the field of vision of an intruder entering a specific area in the antitheft system described above.

BACKGROUND ART

Apparatuses which generate tear gas or a gas having an offensive odor in a monitored area have been proposed in the past as apparatuses for preventing theft. However, these apparatuses have not been able to control the generation and operation of the gas in a particular gas emission object zone.

These apparatuses have not been put into practical application due to the possibility of gas being generated by erroneous operation, and troublesome exhaust operation after the emission of the gas.

On the other hand, an alarm system for raising an alarm by detecting theft by an intruder in a building has been developed and executed. As objects to be protected have become more widespread in recent years, a more effective management of such an alarm system has become necessary. As to a warning mode, for example, the mode can be divided into a mode for when no people are in the area (MODE 1) and a mode for when people are in the area (MODE 2). It is also possible to set the system to cover only a specific zone.

Such an effective system is also required for the smoke generation alarm system.

As a counter-measure for theft or destruction of money, precious articles, etc, inside buildings, there has been proposed a method which detects an intrusion of moving objects such as people or other animals into a specific area by suitable detection means installed at predetermined positions inside the monitored area, emits a tear gas or a gas having offensive odor into the area so as to generate a situation in which the intruder cannot stay inside the area and to force him to give up his intention and action, and prevents in advance the theft or destruction by forcing the intruder to leave the area.

However, such a tear gas or a gas having offensive odor exterts adverse influences on the human body and leaves particular offensive odor inside the monitored area. Furthermore, the gas offends people entering the area later. Still another problem is that if any exhibitions such as precious articles exist inside the monitored area, the components of the tear gas or the gas having offensive odor adhere to the exhibitions and contaminate them. For these reasons, the method has not yet been put into practical application.

DISCLOSURE OF THE INVENTION

It is therefore a first object of the present invention to provide a useful antitheft system which prevents theft by an intruder only when the intruder is detected in an unattended warning mode of the alarm system.

It is a second object of the present invention to provide a antitheft apparatus capable of preventing theft and destruction of money, precious articles, etc, by solving the problems with the prior art described above, filling the monitored area with smoke or atomized smoke-like gas only when an intruder is in the area so as to cut off his vision and thus depriving him of his free action.

To accomplish the first object described above, the first embodiment of the present invention employs the following construction.

A antitheft system which is coupled with a warning system including an intruder detector for detecting intrusion or destruction by an intruder into or inside a warning alarm, and a mode setter for setting or resetting a warning state of the area, and which generates smoke or atomized smoke-like gas inside the monitored area, includes smoke generation operation means which operates the smoke generator in response to the detection of theft or destruction by the intruder detector when the mode setter sets the mode to Mode 1, and prevents the operation of the smoke generator in response to the detection of the intrusion and destruction by the intruder detector when the mode setter sets the mode to Mode 2.

Note, that the Model 1 is to set an area to be protected to an unattended warning condition, while the Mode 2 is to set an area to be protected to an attended warning condition with reset mode.

To accomplish the second object described above, the second embodiment of the present invention provides a antitheft apparatus employing the following technical construction.

A antitheft apparatus comprising moving object detection means installed inside a secure area, smoke generation means for emitting smoke or atomized smoke-like gas into the monitored area in response to the output of the moving object detection means, and control means for controlling each of the means described above, wherein the smoke generation means has a mechanism which generates smoke by vaporizing a smoke generation substance, for example. In other words, since the present invention has the technical construction described above, the smoke generation means heats and vaporizes the smoke generation substance, which consists of alcohols substantially harmless to the human body as primary components, to generate the atomized smoke, to fill the monitored area with this smoke, to cut off the field of vision of the intruder and to deprive the intruder of his free action. The apparatus of the invention may make it possible to arrest the intruder.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing a first definite example of a antitheft system according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing a second definite example of the antitheft system according to the first embodiment of the present invention;

FIG. 3 is a block diagram showing a third definite example of the antitheft system according to the first embodiment of the present invention;

FIG. 4 is a block diagram showing a fourth definite example of the antitheft system according to the first embodiment of the present invention;

FIG. 5 is a flowchart of a smoke generation system in the definite example of the present invention shown in FIG. 4;

FIG. 6 is a block diagram showing a fifth definite example of the antitheft system according to the first embodiment of the present invention;

FIG. 7 is a block diagram showing a definite example of a antitheft apparatus used in the antitheft system according to a second embodiment of the present invention;

FIG. 8 is a block diagram showing a definite example of the construction of the emission means used in the second embodiment of the present invention;

FIG. 9 is a block diagram showing a sectional view taken along a line A--A of FIG. 8;

FIG. 10 is a block diagram showing a structural example of control means used in the antitheft apparatus according to a third embodiment of the present invention;

FIG. 11 is a diagram showing the relationship between a time lapsed of a pump used in the antitheft apparatus according to the third embodiment of the present invention and its liquid feed quantity;

FIG. 12 is a block diagram showing another structural example of the control means used in the antitheft apparatus according to the third embodiment of the present invention;

FIG. 13 is a block diagram showing an example of an overall system of the antitheft apparatus used in a fourth embodiment of the present invention; and

FIG. 14 is a block diagram showing an example of principal portions of control means of a smoke generation apparatus used in the antitheft apparatus according to the fourth embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a antitheft apparatus and its definite examples according to the first to fourth embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a structural block diagram of a antitheft apparatus according to the first embodiment of the present invention.

The antitheft apparatus according to the present invention comprises a mode setter 10, an intruder detector 20, an alarm device 30, a smoke generation actuator 50, a smoke generator 60 and an activation switch 70. This embodiment will be explained about the case where the mode setter 10 is installed outside a monitored area.

The mode setter 10 is connected to the alarm device 30 and to the smoke generation actuator 50, and can set the mode to one of three modes, i.e., a mode in which no person is in the secure area and the state is a warning mode, a release mode in which an operator is in the secure area and therefore, warning is reset and a nighttime mode in which a person is in the secure area and the warning mode is set.

The intruder detector 20 is, for example, a magnet sensor for detecting opening/closing of doors, windows, etc, an infrared sensor for detecting cutoff of infrared by an intruder, and a passive infrared sensor for detecting radiation heat of a human body, etc. This detector 20 is installed on the entrance/exit of the monitored area, walls, windows, etc, and detects opening and closing of the doors and the windows, destruction of the walls, a person inside the secure area, and so forth.

The alarm device 30 includes a first AND gate 32, a first OR gate 36, a second AND gate 37, a first flip-flop 38, a third AND gate 40, a first inverter 31, a second inverter 39, a differentiation circuit 35, a buzzer circuit 33, a local display 34, and an alarm generation circuit 41.

The smoke generation actuator 50 comprises a second OR gate 52, a fourth AND gate 51, a second flip-flop 53, a third inverter 54, a fifth AND gate 55 and a smoke generation activation circuit 56.

The smoke generator 60 generates smoke inside the monitored area by an activation signal from the smoke generation activation circuit 56 or from the activation switch 70.

In case of emergency, the activation switch 70 manually actuates the smoke generation activation circuit 56, irrespective of mode setting by the mode setter 10.

Next, the operation of this embodiment will be explained.

First of all, the case where the monitored area is set to the unattended warning mode will be explained. The person who finally leaves the monitored area first confirms that the intruder detector 20 is not in an erroneous detection state or in other words, that all the doors and windows are normally closed, before he leaves the monitored area. Then, he gets out of the monitored area from a final entrance/exit, not shown in the drawings.

Next, he manipulates and sets the mode setter 10 from the reset mode to the warning mode, which mode setter is installed outside the monitored area.

Due to this manipulation and setting operation, the signal from the mode setter 10 is sent through the first OR gate 36 to the second AND gate 37 and to the differentiation circuit 35, and at the same time, the signal from the mode setter 10 is sent to the fourth AND gate 51.

If the intruder detector 20 is not in the erroneous intruder detection state or in other words, if it is in the normal state, the signal level of this intruder detector 20 is kept at a high level, and its signal is sent to the first inverter 31, the second inverter 39, the third inverter 54 and the second and fourth AND gates 37 and 51.

If the intruder detector 20 is under any erroneous intruder detection state such as the existence of any window which is accidentally left open, its signal level is low. Accordingly, a signal "1" is first sent to the first AND gate 32 through the first inverter 31, so that the two input terminals of the first AND gate 32 become "1" and a logical output appears at its output terminal, thereby actuating the buzzer circuit 33 to ring a buzzer. In other words, the existence of any intruder of the monitored area is automatically inspected at the point of time when the mode setter 10 is set to the warning mode, and setting of the warning mode while the erroneous intruder state remains is notified at once to the person finally leaving the monitored area so that he can re-set the warning mode.

If the erroneous intruder detection state does not exist, the two input terminals of the second AND gate 37 become "1" as is obvious from the explanation given above, and the logical output appears at the output terminal.

In this instance, no output is generated at the output terminal of the first AND gate 32. Accordingly, the buzzer circuit 33 and the local display 34 are not actuated.

On the other hand, if the erroneous intruder detection state does not exist when the warning mode is set by the mode setter 10, the signal is set to the set terminal S of the first flip-flop 38 and the output of its output terminal Q is kept continuously. The output of this first flip-flop 38 is continuously inputted to one of the input terminals of the third AND gate 40.

Signal application is made to the set terminal S of the second flip-flop 53, and the output of its output terminal Q is kept continuously.

The output of this second flip-flop 53 is continuously inputted to one of the input terminals of the fifth AND gate 55.

Next, the explanation will be given on the case were an intruder enters the monitored area when the mode is set to the unattended warning mode as described above.

The output of the first flip-flop 38 is continuously inputted to one of the input terminals of the third AND gate 40. Since the signal from the intruder detector 20 is inputted to the other input terminal of this third AND gate 40 through the second inverter 39, the signal applied to the third AND gate 40 through the second inverter 39 reaches the "1" level when any intruder is detected by the intruder detector 20 in this warning mode. Accordingly, when any intruder is detected during the warning mode, the third AND gate 40 produces a logical output at its output terminal and activates the alarm generation circuit 41, and this alarm generation circuit 41 sends an alarm signal to a remote monitor 80 through a

communication line such as a telephone line.

The signal from the intruder detector 20 is also applied to the other input terminal of the fifth AND gate 55 through the third inverter 54. Therefore, if any intruder is detected by the intruder detector 20 during the warning mode, the signal applied to the fifth AND gate 55 through the third inverter 54 reaches the "1" level. In consequence, when any intruder is detected during the warning mode, the fifth AND gate 55 produces a logical output terminal and activates the smoke generation activation circuit 56.

The smoke generation activation circuit 56 actuates the smoke generator 60 and sends a signal to the alarm generation circuit 41, and the alarm generation circuit 41 sends a signal representing the activation of smoke generation to the monitor device 80 in Alarm center through the communication line such as the telephone line.

The smoke generator 60 is installed inside the monitored area. Receiving the activation signal from the smoke generation actuator 50, this smoke generator 60 automatically ignites and generates smoke by the activation signal.

Smoke thus jetted immediately fills the monitored area and cuts off the field of vision of the intruder.

Since his field of vision is cut off as described above, the intruder cannot continue actions such as theft and destruction inside the monitored area.

When those who are permitted in advance to enter the area know of this intrusion, they can actuate the smoke generator 60 through the smoke generation activation circuit 56 by manually operating the actuator switch 70.

Next, the mode changing operation will be explained hereunder, in which the reset mode is changed to the nighttime mode, i.e., the warning mode with an operator.

The person who first enters the monitored area operates the mode setter 10, consisting of a ten-key pad or other switching device and sets the mode to the resetting mode.

This resetting operation applies the signal from the mode setter 10 to the reset terminal R of each of the first and second flip-flops 38 and 53, and the output of the output terminal Q of each flip-flop is stopped. The outputs of the first and second flip-flops 38 and 53 fall to the low level to one of the input terminals of the third and fifth AND gates 40 and 55. For this reason, even when the signal from the intruder detector 20 is inputted to the other input terminal of each of the second and fifth AND gates 40 and 55, no signal is outputted at this output terminal.

Accordingly, the alarm generation circuit 41 and the smoke generation activation circuit 56 are not operated.

Next, setting the mode from the resetting mode to the night mode in which warning state with operator will be explained.

In the security system, there are the case where the mode is set to the warning system in the nighttime even though some persons be present, and the case where a guard or guards are always stationed in the nighttime so as to guard the doors, windows, etc, depending on the monitored area.

Under such a manned state, the smoke generator 60 is prevented from activation even when the intruder detector 20 detects any intruder.

When the mode is set to the nighttime mode, the signal of the mode setter 10 is inputted to the second AND gate 37 through the first OR gate 36. The operations of the second AND gate 37 and of the first flip-flop 38 are the same as those in the warning mode. If any window is open, the alarm is outputted but the smoke generation activation circuit 56 is not operated.

The second definite example of the antitheft apparatus according to the first embodiment of the present invention will be explained with reference to FIG. 2.

In FIG. 2, like reference numerals are used to identify like devices or circuit elements as in FIG. 1.

By the way, in this example, a particularly important zone such as a vault is arranged to be inside the monitored area.

In this embodiment, each of the second intruder detector 21 and the smoke generation activator 50 each includes a hold circuit 57.

The second intruder detector 21 installed inside an important zone such as a vault inside the monitored area, and detects trespass or existence of an intruder into or inside the important zone.

The operations such as setting of the warning mode are the same as those shown in FIG. 1.

When any intruder intrudes into the monitored area in this warning mode, the intrusion signal from the third AND gate 40 is applied to the alarm generation circuit 41 in the same way as described already, and the alarm is sent to the monitor device 80 through the telephone line. At this point of time, however, the output of the fifth AND gate 55 is input to, and held by, the hold means 57 and the smoke generation activation circuit 56 is not operated. This hold means 57 holds the signal for a predetermined time such as five minutes.

If the intruder intrudes into the important zone within this predetermined period, the second intruder detector 21 detects this intrusion and applies the signal to the hold means 57. When the signal from the intruder detector 21 is inputted to the hold means 57 while it holds the signal from the fifth AND gate 55, it outputs the signal to the smoke generation activation circuit 56. The smoke generation activation circuit 56 lets the smoke generator 60 generate smoke and cut off the field of vision of the intruder. In other words, in this embodiment, the generation of smoke is effected only in the important zone so as to prevent the generation of smoke due to the erroneous operation of the intruder detector 20 and to provide a more effective antitheft apparatus for the important zone.

By the way, the route of the intruder can be distinguished and the reliability of the generation of smoke can be improved by using the intruder detector 20 for detecting intrusion into the monitored area, the second intruder detector 21 for detecting intrusion into the important zone, or by using the intruder detector 20 for detecting intrusion into the monitored area and the second intruder detector 21 for detecting the existence of any intruder in the monitored area.

The third definite example of the antitheft apparatus according to the first embodiment of the present invention will be explained with reference to FIG. 3.

FIG. 3 is a structural block diagram of the antitheft apparatus which confirms the activation of the smoke generator 60 and actuates once again the smoke generator in the event that the smoke generator does not operate.

In FIG. 3, like reference numerals will be used to identify like devices or circuit elements as in FIG. 1.

The antitheft apparatus of this embodiment includes a smoke sensor 90 and a smoke generation confirmation device 100.

The smoke sensor 90 is installed inside the monitored area, is of a photoelectric or ion type, and detects smoke inside the monitored area.

The smoke generation confirmation device 100 comprises a delay circuit 101, a third flip-flop 102, a sixth AND gate 103, a fourth inverter 104, a seventh AND gate 105, an eighth AND gate 106 and a second smoke generation activation circuit 107.

Next, the operation will be explained.

The setting operation to each of the warning mode, the release mode and the nighttime mode is the same as that of the first embodiment. The explanation will be hereby given on the case where the mode is set to the warning mode.

When the intruder intrudes into the monitored area while the mode is set to the warning mode, the smoke generation activation circuit 56 is operated as described above and actuates the smoke generator 60. At the same time, the smoke generation activation signal is inputted to the delay circuit 101 and the set terminal S of the third flip-flop 102 of the smoke generation activation confirmation device 100.

The output of the output terminal Q of the third flip-flop 102 is continuously inputted to one of the terminals of the sixth AND gate 103. Here, when the smoke generator 60 normally operates due to the activation signal from the smoke generation activation circuit 56, smoke is generated inside the monitored area. Sensing this smoke, the smoke sensor 90 sends a signal to the other input terminal of the sixth AND gate 103. Here, the two input terminals of the sixth AND gate 103 become "1" and its output becomes "1". This output is inputted as the smoke generation confirmation signal to the alarm generation circuit 41 and is sent to the monitor device 80.

Next, the explanation will be given in the case where the smoke generator 60 does not operate even when the smoke generation activation circuit 56 starts its operation after the intruder enters into the monitored area.

The activation signal from the smoke generation activation circuit 56 is inputted to the smoke generator 60 and to the delay circuit 101 and the set terminal S of the third flip-flop 102 of the smoke generation confirmation device 100.

Receiving the signal from the smoke generation activation circuit 56, the delay circuit 101 delays it by a predetermined time such as 60 seconds, and inputs the signal to the reset terminal R of the third flip-flop 102 and to one of the input terminals of the seventh AND gate 105. Here, if smoke is not generated by some reason or other even after 60 seconds' time passes from the activation of smoke generation, the smoke sensor 90 naturally does not sense smoke. Accordingly, the signal of the "1" level is inputted to the other input terminal of the seventh AND gate 105 through the fourth inverter 104, and the signal is outputted from the output terminal of the seventh AND gate. This signal is inputted to the second smoke generation activation circuit 107, and activates once again the smoke generator 60.

Here, the smoke generator 60 to be again activated may be installed separately.

Further, if the remote monitor 80 does not receive the smoke generation confirmation signal even though it receives the alarm signal, the smoke generator 60 may be activated directly by a reception circuit, not shown in the drawing, through the telephone line.

Next, if the smoke sensor 90 senses smoke even when the intruder does not intrude into the monitored area or in other words, when the smoke generator 60 does not operate, the output from the Q bar terminal of the third flip-flop 102 is inputted to one of the input terminals of the eighth AND gate 106, and the signal from the smoke generator 90 is inputted to the other input terminal of the eighth AND gate 106. Accordingly, the output of the eighth AND gate 106 becomes "1" and this AND gate sends the signal to the alarm generation circuit 41, so that the alarm generation circuit 41 displays fire on the local display and sends a fire signal to the remote monitor.

Though the definite example given above explains the example of the confirmation of smoke generation by the smoke sensor 90, the present invention is not limited thereto. For example, the smoke generator itself may be provided with the smoke generation confirmation means. For instance, a temperature sensor is installed inside the smoke generator so as to detect heat at the time of the generation of smoke. Alternatively, burn-out of an ignition heater for the activation of the smoke generation is detected by disconnection of the circuit.

Next, the fourth definite example of the first embodiment of the present invention, which warns the intruder before the activation of the smoke generator 60, will be explained with reference to FIGS. 4 and 5.

In FIG. 4, like reference numerals will be used to identify like devices or circuit elements as in FIG. 1.

Reference numeral 110 denotes a detector for detecting whether or not any intruder exists inside the monitored area. The resident retrieval sensor 110 is, for example, a passive infrared sensor, an ultrasonic sensor, and so forth.

Reference numeral 120 denotes a warning controller, which controls lamps, buzzers, etc, for warning the intruder inside the monitored area.

The lamp 121 is lit or turned on and off under the control of the warning controller 120, and warns the intruder.

The buzzer 122 buzzes under the control of the warning controller 120 and warns the intruder.

Next, the operation of this definite example will be explained with reference to the flowchart shown in FIG. 5. The operation before the monitored area is set to the warning mode is the same as that of the first embodiment. When the intruder detector 20 detects the intruder under this warning mode, the output of the fifth AND gate 55 is inputted to the warning controller 120 (Step 2).

The warning controller 120 turns on the lamps 121 (Step 3).

The warning controller 120 actuates a timer, not shown (Step 4), and lets the sensor 110 for detecting whether or not any person exists inside the monitored area after the passage of a predetermined time counted by this timer (Steps 5 and 6).

If the intruder leave the monitored area after the lighting of the lamps 121, the state returns to the state of Step 2.

If the intruder does not leave the monitored area after the lighting of the lamps 121, the controller 120 actuates the buzzer 122 (Step 7). The timer, not shown, counts the time and after the passage of the predetermined time, the sensor 110 for detecting the person inside the monitored area is again actuated to check any person (Steps 8, 9 and 10).

If the intruder gets out of the monitored area after the operation of the buzzer 122, the state returns to the state of Step 2, and this state is held until the mode is set to the resetting mode or to the nighttime mode. Resetting is done when the mode is set to the release mode or to the nighttime mode.

When the intruder still remains inside the monitored area, the smoke generation activation circuit 56 is actuated (Step 11). This smoke generation activation circuit activates the smoke generator 60 and at the same time, inputs the smoke generation signal to the alarm generation circuit 41.

Though the intruder sensor 20 and the resident retrieval sensor 110 have been explained as the separate sensors in this embodiment, they may be the same sensor.

Next, the fifth definite example of the first embodiment of the present invention, wherein a resetting device is installed inside the monitored area, will be explained with reference to FIG. 6.

In FIG. 6, like reference numerals will be used to identify like devices or circuit elements as in FIG. 1.

Reference numeral 130 denotes resetting device installed inside the monitored area. The release device comprises a magnetic card reader or a tenkey input device, for example, checks qualification of an operator and effects the resetting operation.

Reference numerals 131 and 132 denote resetting circuits, which hold the outputs of the third and fifth AND gates 40 and 55 for a predetermined time, and cancels the alarm generation and the smoke generation by the input of the resetting signal from the resetting device 130 within the predetermined time.

Next, the operation will be explained below.

The set operation of the warning mode of the monitored area is the same as that of the first definite example.

If a person forgets to change the warning mode to the release mode by the mode setter and enters the monitored area, the intruder detector 20 detects intruder and the outputs are produced from the third and fifth AND gates 40 and 55 in the same way as described above. The output of the third AND gate 40 is inputted to the release circuit 131 and to the buzzer circuit 33. The output of the fifth AND gate 55 is inputted to the release circuit 132.

Here, the release circuits 131 and 132 hold the inputted signals for a predetermined time such as 30 seconds.

Since the buzzer circuit 33 buzzes, the entering person realizes that he has forgotten to operate the mode setter 10, and makes the resetting

operation by the use of the resetting device 130. This resetting operation is carried out, for example, by inserting a magnetic card, registered in advance, into the magnetic card reader.

In this way, the qualification check of the person qualified to operate the release device 130 is made so that the intruder cannot reset the warning mode.

When the entering person effects the resetting operation within the predetermined time described above, the release circuits 131 and 132 cancel the signals they have held. Accordingly, the generation of the alarm and smoke can be prevented by a qualified person in the monitored area.

If an unqualified person enters the monitored area, he cannot naturally operate the resetting device 130, so that smoke is generated and the alarm is transmitted to the monitor device 80 through the communication line such as the telephone line, after the passage of the predetermined time.

The alarm generation circuit 41 may be provided with the reception means and the smoke generation activation means so that the smoke generator can be activated by remote control from the monitor device 80.

Though the smoke generator is installed inside the monitored area in the embodiment described above, it is also possible to dispose the smoke generator outside the monitored area and to introduce smoke to the floors or walls of the monitored area through pipes, or the like.

A plurality of introduction portions may be installed in accordance with the quantity of smoke generated.

In the definite example described above, smoke is automatically jetted and cuts off the field of vision of the intruder even when the intruder enters into the monitored area.

The first to fifth definite examples described above use the smoke generator which generates smoke upon combustion, but this is not limitative, in particular. For example, a smoke generation substance such as an alcohol may be heated for vaporization and be jetted in the atomized state.

The antitheft apparatus of the present invention can also be applied to an object for which the warning mode is set under the state where qualified persons are in the area, and smoke is not generated. Accordingly, the qualified persons are not prevented from free action due to the generation of smoke.

Next, the antitheft apparatus according to the second embodiment of the present invention will be explained in detail with reference to definite examples thereof shown in the drawings.

FIG. 7 is an explanatory view useful for explaining the construction of a definite example of the antitheft apparatus according to the second embodiment of the present invention. The drawing shows a antitheft apparatus 110 which is installed inside the monitored area 101 and which comprises moving object detection means 131 and 132, smoke generation means 104 for jetting atomized smoke (hereinafter called merely "smoke") into the monitored area in response to the output of the moving object detection means, and control means 105 for controlling each of these means.

A zone 102 in which a monitored object such as a safe, an automatic cash dispenser, expensive merchandise such as precious metals, arts and crafts such as paintings, etc, is installed inside the monitored area 101 of the present invention. Quite n