JP3071506B2 - Intrusion detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intrusion detection device,
The present invention relates to an intrusion detection device that can be easily used in combination with an existing theft alarm device.

[0002]

2. Description of the Related Art For example, as shown in Japanese Patent Application Laid-Open No. 3-61149, there is a known anti-theft device in which an alarm device is activated when an open / close unit in an armed state is illegally released. In this anti-theft device, a switch that detects opening and closing of a door, an alarm device, and an armed state that generates an alarm signal that activates the alarm device when an output of the switch is received or a disarmed state and an alarm device that does not generate an alarm signal are provided. It has an alarm control circuit that is switched to an alarm state to be activated, and an indicator that blinks by an output of the alarm control circuit when in an armed state.

On the other hand, for example, US Pat. No. 3,781,85
As disclosed in No. 4, automotive alarm control circuits are known. The alarm control circuit for the vehicle is switched from the disarmed state to the armed state when all doors of the automobile are closed and the door is locked by operating the cylinder lock. If the door, trunk or hood is opened illegally in the armed state, an alarm is automatically generated and the car can be prevented from being stolen.

Further, as disclosed in, for example, Japanese Patent Application Laid-Open No. 62-98280, a device for detecting a moving object using ultrasonic waves is known. A moving object detection device using ultrasonic waves includes an ultrasonic transmission circuit, a reception circuit that receives a sound wave transmitted from the ultrasonic transmission circuit and reflected on the surface of the moving object, and a detection circuit that detects a change in output of the reception circuit. Have.

[0005]

By the way, a novel anti-theft device has been proposed in which the moving object detection device is provided as one of the detection sensors of the anti-theft device. In this anti-theft device, a moving object detection device that uses ultrasonic waves is necessary to prevent unauthorized intrusion that breaks the window glass of the vehicle and enters the vehicle. However,
When a moving object detection device is connected to a commercially available anti-theft device, the alarm control circuit itself composed of a one-chip microcomputer must be replaced. For this reason, there are disadvantages that replacement parts are expensive and replacement work is complicated.

Accordingly, an object of the present invention is to provide an intrusion detection device which can easily attach a new detection sensor to an existing anti-theft device.

[0007]

SUMMARY OF THE INVENTION An intrusion detection device according to the present invention includes a switch means, an alarm device, and an armed or non-armed state for generating an alarm signal for activating the alarm device when an output of the switch means is received. It has an alarm control circuit that can be switched between an armed state and an alarm state for activating an alarm device, and an indicator that blinks by an output of the alarm control circuit when in the armed state. The intrusion detection device further includes a retrigger one-shot multivibrator that is activated by an output of an alarm control circuit that activates an indicator, a switching element that is turned on and off by an output of the retrigger one-shot multivibrator, and a switching element. And an intrusion sensor having an output terminal connected to the alarm control circuit when the power supply is turned on.

[0008]

The intermittent signal given to the indicator is converted into a stable continuous signal by the retrigger one-shot multivibrator. By turning on the switching element by the continuous signal, the intrusion sensor can be maintained in the operating state during the armed state. As long as the retrigger one-shot multivibrator does not generate a continuous signal, the intrusion sensor will not be activated, thereby saving power. When the active intrusion sensor detects an unauthorized intrusion, the intrusion sensor provides an output to the alarm control circuit, so that the alarm control circuit generates a signal to activate the alarm device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an intrusion detection device according to the present invention will be described below with reference to FIGS. The intrusion detection device 10 according to the present invention includes an alarm control circuit 11 composed of a one-chip microcomputer or a plurality of ICs. To the input terminals 11a and 11b of the alarm control circuit 11, a lock switch and an unlock switch for respectively displaying a locked state and an unlocked state of a door lock device (not shown) are connected. Various types of switches can be used for the input terminal 12 for receiving the lock signal input from the lock switch and the input terminal 13 for receiving the unlock signal input from the unlock switch. Although not shown, for example, the lock switch and the unlock switch connected to the input terminals 12 and 13 are momentarily switched at the time of switching when the door lock device is manually or electrically switched to the locked state and the unlocked state. A transient output switch that generates a pulse and a status display output switch that continuously displays the status after switching are used. The transient output switch and the status display output switch are provided in a door lock actuator, a door lock timer, or a door lock device, and which switch is used depends on the type of vehicle. The transient output switch generates a short pulse width output the moment the lock knob is moved to the locked position. For this reason, in the door lock device using the temporary output switch, the temporary output switch does not generate any of the lock signal and the unlock signal when the door is opened, and thus the locked state or the unlocked state is not generated. Can not be identified. On the other hand, when the status display output switch opens the door, the unlock signal is continuously generated,
It is easy to distinguish between the locked state and the unlocked state. When an existing vehicle is equipped with an anti-theft device, it must first be determined whether a transient output switch or a status display output switch is being used. Therefore, if an unlock signal is received when the door is opened, it can be determined that the status display output switch should be used, and if no unlock signal has been received, it can be determined that the temporary output switch should be used. When it is determined that the temporary output switch is to be used, the input terminal 23 receives the door switch input when the door switch is turned on, so that the use of the temporary output switch is stored, and then the lock signal is output. It waits for a pulse signal to represent. Regardless of whether the door is opened or closed in the standby state, it is necessary to store the locked state when a pulse signal representing the lock signal is generated, and to confirm the storage of the locked state after the door is closed.

In this embodiment, the lock signal input and the unlock signal input of the lock switch and the unlock switch for generating the transient output are input terminals 12 and 13 for the vehicle using the transient output switch. Given to. For a vehicle using the status display switch, an output signal of an unlock switch that continuously generates a low-level output when the lock device is in an unlocked state is provided to an input terminal 13 and an input terminal 12 is provided. Is not used.

The input terminals 11c and 11d of the alarm control circuit 11
Are transistors 14 and 15 constituting an amplifier, respectively.
1 that constitutes a door lock actuator via
6 is connected to one end and the other end. One end and the other end of the motor 16 are connected to relays 17 and 18, respectively.
The relays 17 and 18 are connected to a lock control circuit 20.
The lock control circuit 20 is controlled by various methods. For example, the lock control circuit 20 is connected to a receiving circuit 22 for receiving a radio signal including a predetermined code transmitted from a transmitter 21. When the relay 17 is turned on to lock the door lock device and the transistor 14 is turned on, the input terminal 11c of the alarm control circuit 11 receives the lock signal of the motor 16. In order to unlock the door lock device,
When the transistor 18 is turned on and the transistor 15 is turned on, the input terminal 11d of the alarm control circuit 11 receives the unlock signal of the motor 16.

The input terminals 11e and 11f of the alarm control circuit 11
Are connected to an input terminal 23 connected to the door switch and an input terminal 24 connected to the detection switch, respectively. The door switch is turned on when a vehicle door is opened and turns on a room lamp. Further, the detection switch includes a door switch, and is used for a vehicle hood.
Hood switch and trunk switch for detecting opening of the door and trunk, a tamper switch that is operated when a cylinder lock is operated improperly, and a vibration detection switch that detects this vibration when the automobile vibrates under an external force. And various other switches. Input terminal 11g of alarm control circuit 11
Is connected to an input terminal 26 which receives a signal when the ignition switch is turned on via a transistor 25 constituting an amplifier. The input terminal 11h of the alarm control circuit 11 is connected to the collector of a transistor 28 as a switching element via a pulse generation circuit 27.
The emitter of transistor 28 is connected to the collector of transistor 14. The emitter of the transistor 28 is connected to a DC power supply via a constant voltage circuit 30. The constant voltage circuit 30 is connected to a power input terminal 11i of the alarm control circuit 11. The base of the transistor 28 is the collector of the transistor 14 and the input terminal 11j of the alarm control circuit 11.
Connected to.

The output terminals 11k and 1 of the alarm control circuit 11
11 is connected to respective anodes of a green indicator 31 of a green diode and a red indicator 32 of a red diode via amplifier circuits 35 and 36, respectively. The cathodes of the green diode 31 and the red indicator 32 are grounded. The output terminal 11m of the alarm control circuit 11 is connected to the alarm device 34 via the amplifier circuit 33. Alarm device 3
Reference numeral 4 denotes a horn, a lamp, or another acoustic device or light-emitting device mounted on an automobile.

An alarm control circuit 11 detects whether an unlock signal is generated from the lock device when the door switch is turned on, and generates an unlock signal from the lock device when the door switch is turned on. A lock signal detecting unit that waits for a lock signal generated from the lock device when not in operation, and a lock device that detects that an unlock signal is generated from the lock device when the door switch is turned on or waits for the lock signal. A lock signal storage means for receiving and storing a lock signal from the controller, and a switching means for setting an armed state after the door is closed in a state where the lock signal is stored.

The intrusion detection device 10 is further controlled to be turned on / off by an output of a retrigger one-shot multivibrator 38 connected to an output terminal of an amplifier circuit 36 connected to the red indicator 32 and an output of the retrigger one-shot multivibrator 38. An intrusion sensor 40 such as a vibration sensor having a transistor 39 serving as a switching element and an output terminal connected to an input terminal 11f of the alarm control circuit 11 and maintained in an operating state when the transistor 39 is turned on.
And The retrigger one-shot multivibrator 38 counts an input pulse interval longer than the intermittent output of the amplifier circuit 36. Therefore, unless the alarm control circuit 11 is switched from the armed state to another state, an intermittent output is generated from the amplifier circuit 36, during which the retrigger one-shot multivibrator 38 continuously outputs the intrusion sensor 40.
And a driving signal is provided to maintain the operating state. For this reason,
The retrigger one-shot multivibrator 38 converts the intermittent signal given to the red indicator 32 into a stable continuous signal. The retrigger one-shot multivibrator 38 can maintain the intrusion sensor 40 in the operating state during the armed state by turning on the transistor 39 in response to the continuous signal.

In the above configuration, the alarm control circuit 11 is programmed to operate according to the operation sequence shown in FIGS. When the process proceeds from step 50 to step 51, the door open / close detecting means of the alarm control circuit 11
The voltage applied to 1e is detected. When the door is opened, the door switch is turned on, so that the voltage applied to the input terminal 23 and the input terminal 11e changes from high level to low level (step 52), and at the same time, the transistor 14
Turns on. When the transistor 14 is turned on, the transistor 28 is also turned on. Therefore, a reset pulse is applied to the input terminal 11h through the pulse generation circuit 27, and the alarm control circuit 11 is switched from the standby mode to the operation mode. Next, at step 54, the alarm control circuit 11
Lock detecting means determines whether or not to receive an unlock signal.

As described above, when the status display output switch is used as the unlock switch 13, the unlock switch 13 continuously generates a low-level unlock signal as long as the lock device remains unlocked. . vice versa,
A high-level lock signal is continuously generated as long as the lock device holds the locked state. Therefore, the lock switch 12 and the input terminal 11a become unnecessary in the vehicle type using the status display output switch. However, in a vehicle model using a transient output switch, when the lock device is switched between the locked state and the unlocked state, only a low-level lock signal and a unlock signal having a short pulse width are generated at the moment of the switch. . For this reason, in a vehicle type using the transient output switch, it is necessary to wait for the generation of a lock signal having a short pulse width and to store the generation of the lock signal when it occurs.
In addition, the transient output switch actually used generates a lock signal and an unlock signal having a short pulse width, respectively, only when operated in the locked state and the unlocked state, and switches from the locked state or the unlocked state to the neutral state. No output occurs when returning to the state. Thus, the transient output switch has irreversible characteristics.

When the door is opened in step 51, the door is in the unlocked state. If the status display output switch is used as the unlock switch 13 in this case, the input terminal 11b goes low. However, if the temporary output switch is used as the unlock switch 13, the lock device cannot be switched to the unlocked state at the moment when the door is opened. Therefore, when the transient output switch is used as the unlock switch 13, the input terminal 11b is at a high level when the door is opened. As described above, in step 54, by detecting whether or not the unlock signal has been received at the time when the door switch 23 is turned on, the lock detecting means can be used as the unlock switch so that the temporary output switch or the status display output switch can be used. Can be determined.

As described above, if the unlock signal has been received when the door switch 23 is turned on in step 54, the lock detecting means determines that the status display output switch is being used, and proceeds to step 55. , The green indicator 31 is blinked. Green indicator 31
Blinks for easy visual confirmation that the door is open. Therefore, the blinking of the green indicator 31 allows the driver to optically display the door open state and the half-door state to the driver. If the unlock signal has not been received when the door switch 23 is turned on in step 54, the lock detecting means determines that the temporary output switch is being used, and in step 54, the temporary output switch Wait for the lock signal,
Thereafter, in step 55, the green indicator 31 is turned on and off. Then, the process proceeds to a step 56, wherein it is determined whether or not the locked state is stored. Since the locked state is not stored at first, the process proceeds to step 57. If the transient output switch is used in step 57, the lock signal standby state is maintained in step 54.
Proceeding from step 57 to step 58, it is determined whether a lock signal with a short pulse width has been received. Step 58
When the lock signal is received, the locked state is stored in step 59, and the process proceeds to step 64. If no lock signal is received in step 58, step 64
Proceed to. In step 57, in the case of a vehicle using the status display output switch, the state is not switched to the lock signal standby state, so the process proceeds to step 63, and it is determined whether an unlock signal has been received. The state display switch applies a low-level unlock signal to the input terminal 13 when in the unlocked state, and applies a high-level lock signal to the input terminal 13 when in the locked state. Therefore, in the unlocked state, the unlock signal is continuously output.
When the state is switched to the locked state, the process proceeds from step 63 to step 59 to store the locked state, and then proceeds to step 6
Proceed to 4. In step 64, it is determined whether the door has been closed. If the door is not closed, the process returns to step 55, and it is determined whether or not the locked state is stored in step 56 while the blinking of the green indicator 31 is continued. Since the locked state has already been stored in step 59, the process proceeds from step 56 to 61 to determine whether or not an unlock signal has been received. Green indicator
When the lock knob is operated in the unlocking method and the unlock switch is operated while the data 31 is blinking, an unlock signal is generated. When an unlock signal is received, the process proceeds from step 61 to 64, and when an unlock signal is received, the locked state is deleted in step 62 and the process proceeds to step 64. If the door is not closed in step 64, the operation repeats between steps 55 and 64.

In step 64, when the door is closed, the locked state detecting means determines whether the locked state is stored. If the locked state has been erased in step 62, the flow advances from step 65 to step 93 in FIG. 4 to turn off the green indicator 31 and then to start 50.
Return to If the locked state is stored in step 65, the process proceeds to step 66, where the green indicator 31 is turned off.

The transmitter 21 transmits a radio signal including a lock signal, and the reception circuit 22 receives the radio signal. In response to this, the lock control circuit 20 turns on the relay 17 so that the motor 16 can be operated in the lock direction.
Conversely, the transmitter 21 sends out a wireless signal including an unlock signal, and the receiving circuit 22 receives this wireless signal. In response, the lock control circuit 20 turns on the relay 18 and
The motor 16 can be operated in the unlock direction.

When the door is closed in step 51, the process proceeds to step 60, where the base of the transistor 14 detects a current flowing through the motor 16 as an actuator, and the motor 16 generates a lock signal. It is determined whether or not it has been done. If the motor 16 does not generate the lock signal, the process returns from the step 60 to the start 50. When the motor 16 is operated in the locking direction in step 60, the locking device is locked and the transistor 14 is turned on at the same time. When the transistor 14 is turned on, the transistor 28 is also turned on.
A reset pulse is applied to h, and the alarm control circuit 11 is switched from the standby mode to the operation mode.

Then, the process proceeds to a step 67, wherein the input terminal 11
When e is at a high level and the lock state storage means is storing the lock state, the timer means operates a 30 second timer. In step 68, the red indicator 32 is turned on to indicate that the armed preparation state is set. At this time, the retrigger one-shot multivibrator 38 generates an output and turns on the transistor 39. Therefore, when the intrusion sensor 40 in operation detects an unauthorized intrusion, the intrusion sensor 40 gives an output to the alarm control circuit 11, so that the alarm control circuit 11 generates a signal for operating the alarm device 34. Subsequently, in step 69, it is determined whether or not the door has been opened. When the door is opened, the input terminal 23 is switched to a low level. If the door has not been opened, the routine proceeds to step 70, where it is determined whether or not an unlock signal has been generated at the input terminal 13.

When the transmitter 21 transmits a radio signal including an unlock signal, the radio signal is received by the receiving circuit 22. In response, the lock control circuit 20 turns on the relay 18, and the motor 16 is operated in the unlock direction. The base of the transistor 15 detects in step 71 whether an unlock signal has been received based on the current flowing through the actuator, that is, the motor 16. When the base of the transistor 15 receives the unlock signal, the transistor 15 is turned on, and a low-level unlock signal is applied to the input terminal 11d. However, if no unlock signal is generated, the process proceeds to step 72, where the input terminal 11
It is determined whether the ignition switch has been turned on based on the signal received by g. When the ignition switch is turned on, a high-level voltage is applied to the input terminal 26, and the transistor 25 is turned on. Therefore, a low-level signal is applied to the input terminal 11g.

When the unlock signal is received at step 70, when the unlock signal of the motor 16 is received at step 71, or when the ignition switch is turned on at step 72, start 5
Return to 0. If the ignition switch is kept off in step 72, the process proceeds to step 73, and it is determined whether or not the 30-second timer has counted a predetermined time. If the predetermined time has not elapsed, steps 73 to 69
Return to If the door is opened in step 69, the process proceeds to step 75, where the memory of the locked state is deleted, and then the process returns to step 55. As described above, when the 30-second timer does not count the predetermined time, the operations of steps 69 to 73 are repeated.

When the elapse of a predetermined time is counted in step 73, the flow advances to step 74, and the red indicator 32
Is turned off, and the process proceeds to step 76 in FIG. 4, where the red indicator 32 is flashed once every 30 seconds or every 3 to 4 minutes. The red indicator 32 is 10-50 mA, for example, 2
It is a 150 ms pulse with a magnitude of 0 mA. This is because the blinking speed of the red indicator 32 is slowed down and blinked slowly, so that it is easy to visually confirm that the alarm control circuit 11 is in the armed state. In the armed state, the engine of the vehicle is stopped and the battery is not charged. Therefore, when displaying the armed state by blinking the red indicator 32, it is necessary to reduce the current consumption as much as possible. The retrigger one-shot multivibrator 38 continuously generates an output when the input signal is received at a predetermined time interval simultaneously with the slow blinking of the red indicator 32 and keeps the transistor 39 in the on state. For this reason, in the present embodiment, the red indicator 32
By making the off time longer than the on time,
The current consumption when the red indicator 32 is energized can be greatly reduced. In addition, since the intrusion sensor 40 is kept in the non-operating state except in the armed state or the armed preparation state, power consumption can be reduced. In this case, the average current I flowing through the red indicator 32 is I = {(current consumption when red indicator 32 is on × time) + (current consumption when red indicator 32 is off × time)}. (ON time of red indicator 32 + OFF time). If the average current I is 1 to 3 mA or less, short-time discharge of the battery can be practically sufficiently prevented. With a well-maintained vehicle battery, the battery capacity will not drop below the level required to start the engine, even if it is kept in the armed condition for more than three months.

In the slow blinking state of the red indicator 32, the routine proceeds to step 77, where it is determined whether or not the motor 16 has generated an unlock signal. When the motor 16 is operated in the unlocking direction and the locking device is unlocked, the transistor 1 is turned on.
The base 5 detects the current flowing through the motor 16 and turns on the transistor 15. Therefore, the input terminal 11d
Since a low level voltage is applied to the input terminal 11d, the unlock signal of the motor 16 can be received by the input terminal 11d. When the motor 16 generates an unlock signal in step 77, the red indicator 32 is turned off in step 93 to release the armed state. After switching to the disarmed state, the process returns to the start. Step 78 if the motor 16 does not generate an unlock signal.
Then, it is determined whether or not the ignition switch is turned on by the input terminal 23. When the ignition switch is turned on, the armed state is released in step 93 in the same manner as described above. This is to release the armed state when the ignition switch is operated in the vehicle. If the ignition switch is maintained in the off state in step 78, it is determined in step 79 whether the antitheft sensor such as a door switch, a hood switch, a trunk switch, or a tamper switch applied to the input terminal 24 has been turned on. . When the antitheft sensor is in the OFF state, an operation of repeating steps 76 and 79 is performed. When any one of the antitheft sensors is turned on in step 79, the process proceeds to step 80, where the red indicator 32
Is turned off and the timer means starts counting by the 6-second timer at step 81, and then at step 82, the red indicator 32 flashes quickly every second. During the operation of the 6-second timer, the apparatus is in the alarm preparation state. The time lag of 6 seconds is set when the device is accidentally switched to the alarm ready state.
This is because the ignition switch is operated to switch to the disarmed state before switching to the alarm state. Thereafter, in step 83, it is determined whether or not the ON output of the ignition switch applied to the input terminal 26 is applied. Here, when the ignition switch is turned on, the routine proceeds to step 93, where the same operation as described above is performed, and the routine returns to the start 50. If the ignition switch is maintained in the OFF state, the routine proceeds to step 84, where it is determined whether or not the 6 second timer of the timer means has counted 6 seconds. If six seconds have not yet elapsed, the process returns to step 82, where the red indicator 32 continues to blink rapidly, and the process proceeds to step 82.
And 84 are repeated. After 6 seconds have elapsed, the state is switched to the alarm state, and the red indicator 32 is turned off (step 85). In step 86, the one-minute timer is operated, and the output terminal 11m is connected via the amplifier circuit 33.
The drive signal is provided to the alarm device 34 from the above. For this reason,
In step 87, the alarm 34 is activated, during which the green and red indicators 31 and 32 flash alternately. Thereafter, the routine proceeds to step 89, where it is determined whether or not the ignition switch has been turned on. If the ignition switch is maintained in the off state, the routine proceeds to step 90, where it is determined whether or not the one minute timer has counted one minute. . If less than one minute, return to step 88 and repeat the operation between steps 88 and 90. Step 89
When the ignition switch is turned on at, the drive signal to the alarm device 34 is stopped at step 94,
After stopping the alarm, the process proceeds to step 93, and then the above operation is repeated. When the timer counts one minute in step 90, the green indicator 31 and the red indicator 32 are turned off in step 91. Thereafter, in step 92, it is determined whether or not the antitheft sensor is turned on again. When the antitheft sensor is turned on, the flow returns to step 86, the 1-minute timer is operated again, and the operation after step 86 is repeated.

The embodiment of the present invention is not limited to the above embodiment, but can be further modified. For example, in the above-described embodiment, an example has been described in which the retrigger one-shot multivibrator 38 starts operating with a rising signal when the amplifier circuit 36 is turned on. However, the retrigger one-shot multivibrator 38 uses the amplifier circuit 3
When the falling signal is received when the switch 6 is turned off, an output is generated and the retrigger time can be counted. In this case, the retrigger one-shot multivibrator 38 does not generate an output in the armed preparation state where the amplifier circuit 36 is continuously turned on. Further, the red indicator 32 may be turned on when the output terminal 111 of the alarm control circuit 11 is switched to the low level. In this case, the operation can be started even if the retrigger one-shot multivibrator 38 receives either a rising signal or a falling signal as an input signal.

Further, besides using a radio to operate the lock control circuit 20, an infrared or key entry system having a plurality of switches can be used. In the embodiment of FIGS. 1 and 2, the mechanical key is used.
The operation may be switched between an armed state and a disarmed state by operating a cylinder lock interlocked with a lock or a lock knob. It is also apparent that the present invention can be applied to buildings other than automobiles.

[0030]

As described above, according to the present invention, it is possible to obtain an intrusion detection device which can easily attach a new detection sensor to an existing anti-theft device.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an anti-theft device according to the present invention;

FIG. 2 is a circuit diagram showing details of a detection sensor.

FIG. 3 is a flowchart showing an operation sequence of the circuit of FIG. 1;

FIG. 4 is a flowchart showing an operation sequence of the circuit of FIG. 1;

[Explanation of symbols]

10. . 10. Intrusion detection device, . Alarm control circuit, 3
2. . Indicator, 34. . Alarm device, 38. . Retrigger one-shot multivibrator, 39. . Transistor (switching element), 40. . Intrusion sensor,

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification code FI G01V 1/00 G01V 1/00 A (56) References JP-U 3-28960 (JP, U) (58) Fields surveyed ( Int.Cl. ⁷ , DB name) G08B 13/00 B60R 25/10 G01S 15/58 G01V 1/00

Claims (2)

(57) [Claims] A switch means, an alarm device, an armed state for generating an alarm signal for operating the alarm device when an output of the switch means is received, a disarmed state for not generating the alarm signal, and an alarm state for operating the alarm device. An intrusion detection device having an alarm control circuit that is switched to an alarm control circuit and an indicator that blinks when the armed state is output by the alarm control circuit. An intrusion detection device comprising: a vibrator; a switching element that is turned on / off by an output of a retrigger one-shot multivibrator; and an intrusion sensor that is kept in an operating state when the switching element is turned on. 2. The intrusion detection device according to claim 1, wherein the intrusion sensor is an ultrasonic intrusion sensor.