JP2003288651A - Theft detector and theft detecting cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure sufficient security by surely detecting a disconnection or short circuit by a schemed action. <P>SOLUTION: This theft detecting cable 2 is used to fasten an object of theft detection to a structure, and comprises a pair of flexible signal lines 24 and 25 the tip parts of which are connected by a prescribed resistor 28. The tip of the theft detecting cable 2 is engaged to a casing 14 fixed to the object of theft detection through an engaging and disengaging means 15. The base end part of the theft detecting cable 2 is connected to a theft monitoring part 12. The theft monitoring part 12 determines the presence of disconnection and short circuit of the theft detecting cable 2 based on the voltage applied to the signal lines 24 and 25, and outputs an abnormality when the presence of disconnection or short circuit is determined. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a theft detection cable for connecting a theft detection target such as a motorcycle or a bag to a structure, and when the theft detection cable is forcibly cut or dropped. The present invention relates to a theft detection device and a theft detection cable that detect an abnormality in the above and make a notification to a predetermined information center.

[0002]

2. Description of the Related Art Conventionally, as a theft detection device, a wire lock type locking device in which a lock is arranged at an end of a wire cable is known. However, such a lock device as a theft detection device may be immediately damaged when the wire is cut by using a tool such as a wire cutter, and the cutting of the wire cannot be immediately detected, which may result in theft damage. .
Also, if the wire cable is made thick so that it cannot be easily cut with a tool such as a wire cutter, the anti-theft effect can be improved, but the wire cable itself is inconvenient to handle and the portability is significantly reduced. There was a problem of doing.

Therefore, various types of theft detection devices have conventionally been applied for solving the above-mentioned problems. As one example thereof, a theft detection device disclosed in Japanese Patent Laid-Open No. 60-226979 is known. In this theft detection device, a conductor is incorporated in the wire cable to energize it, and when the wire cable is cut, a disconnection state of the conductor is detected to perform a notification operation.

As another example, JP-A-58-120
A theft detection device disclosed in Japanese Patent No. 965 is also known. This theft detection device has a wire cable that incorporates a pair of conductors that are in an energized state, and detects a short circuit of the conductor when the wire cable is cut and performs a notification operation.

[0005]

However, in the theft detection device disclosed in Japanese Patent Laid-Open No. 60-226979 mentioned above, the theft detection is performed by separately forming a bypass circuit for the current instead of the current-carrying conductor of the wire cable. There is a problem that it is possible to avoid the operation.

Further, in the theft detection device disclosed in JP-A-58-120965, when a wire cable is cut by a metal tool such as a wire cutter, the conductor inside the wire cable is cut by the metal tool. It is configured to short circuit. Therefore, there is a possibility that disconnection of the wire cable may not be detected when the wire is cut with a tool made of a non-conductive material such as a ceramic knife.

In any case, in the conventional theft detection device,
There has been a problem that it is not possible to detect both disconnection and short circuit of the wire cable, and sufficient security cannot be ensured.

Therefore, the present invention has been made in view of the above problems, and can reliably detect a disconnection or a short circuit due to an act of making a plan on a wire cable to ensure sufficient security, and have an excellent antitheft effect and a portable device. It is an object of the present invention to provide a theft detection device, a theft detection cable, and a theft detection method that are compatible with each other.

[0009]

In order to solve such a problem, the first invention is that a theft detection cable for connecting a theft detection target to a structure is connected and the theft detection cable is cut. A theft detection device for detecting theft by detecting the fact that a pair of flexible signal lines are connected at their tip ends with a predetermined resistor, and the theft detection cable. The base end of the theft detection cable is disengageably engaged with the housing in which the base end is attached, and the base end of the theft detection cable is connected to the signal line. The presence or absence of a break or short circuit in the theft detection cable is determined based on the voltage applied to the signal line or the current flowing through the signal line when an electric current is applied, and an abnormal output is made when it is determined that there is a break or short circuit. Parts and To provide a theft detection device.

Such a theft detection device uses an anti-theft cable to connect an object for theft detection such as an automobile, a motorcycle, a bicycle, a bag, valuables, and a pet to a structure such as a pillar, a fence, or a bench with a tip. Both a disconnection and a short circuit of the theft detection cable can be detected by monitoring the circuit formed by the resistor and the signal line connected to the voltage or current. As a result, the first aspect of the present invention can reliably detect the act of cutting the theft detection cable with a tool made of a non-conductive material and intentionally short-circuiting the theft detection cable.

In order to solve such a problem, a second invention is to monitor when a theft detection cable for connecting a vehicle to a structure is connected and it is detected that the theft detection cable is cut. A theft detection device for a vehicle that reports to a center, wherein a pair of flexible signal lines has a tip portion connected with a predetermined resistor, and a theft detection cable,
An engaging / disengaging means for releasably engaging a tip end portion of the theft detection cable with a housing in which a base end portion of the theft detection cable is installed and fixed to the vehicle; With the base end connected, the presence or absence of a short circuit or a short circuit is determined by determining the presence or absence of disconnection and short circuit of the theft detection cable based on the voltage applied to the signal line or the current flowing through the signal line when the signal line is energized. A theft monitoring unit that abnormally outputs when it is determined, and a reporting unit that reports an abnormal signal to the monitoring center together with the current position of the vehicle when the abnormal output is received from the theft monitoring unit A detection device is provided.

Such a theft detection device uses a cable for detecting theft to connect a theft detection target of a vehicle such as an automobile, a motorcycle or a bicycle to a structure such as a support, a fence or a bench, and a resistor connected to the tip of the resistance. By monitoring the circuit formed by the device and the signal line with voltage or current, both disconnection and short circuit of the theft detection cable can be detected, and an abnormal signal can be notified to the monitoring center together with the current position. . As a result, the second invention makes it possible to reliably detect the act of cutting the theft detection cable with a tool made of a non-conductive material and intentionally short-circuiting the theft detection cable. It is possible to know the location of the stolen vehicle.

In a preferred mode, an abnormal output is provided when the tip of the theft detection cable falls out of the engagement / disengagement means during the monitoring mode, and the tip of the theft detection cable is disengaged from the engagement / disengagement means during the non-monitoring mode. Make sure that no abnormal output occurs even if it falls out. According to this aspect, not only disconnection or short circuit of the theft detection cable but also drop-off of the tip portion can be detected, so that security is improved.

Further, in a preferred mode, when the non-monitoring mode is entered within a predetermined time after the dropout state is detected, the abnormal output is canceled. According to such an aspect, even if the user mistakenly disengages the theft detection cable before shifting from the monitoring mode to the non-monitoring mode, it is possible not to immediately make an abnormality determination.

Furthermore, in a preferred mode, the anti-theft cable is housed in a winding mechanism which can be unwound / rewound freely.

A third aspect of the present invention is a theft detection cable that has a signal line capable of conducting and that connects a theft detection target to a structure, wherein the signal line is made of a flexible conductor. Provided is a theft detection cable including a pair of signal lines, wherein one end of the pair of signal lines is connected with a resistor. By using such a theft detection cable in a theft detection device, it is possible to reliably detect the act of cutting the theft detection cable with a tool made of a non-conductive material and intentionally short-circuiting the theft detection cable.

In a preferred mode of the theft detection cable, the pair of signal lines has a coaxial structure composed of a center conductor and an outer conductor, and the outer conductor is formed by a stranded wire of nickel plated wire or stainless plated wire. This theft detection cable
It is possible to secure the anti-theft property that is not easily cut while maintaining the flexibility such that unwinding / rewinding can be performed by the winding mechanism.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a theft detection device and a theft detection cable according to the present invention will be specifically described below with reference to the drawings. In the present embodiment, a case where the theft detection device and the theft detection cable according to the present invention are adopted as a theft detection target in a motorcycle will be described as an example. Also, the theft detection target is a car,
If you don't want your users to be stolen, such as bags and valuables,
It is not limited to motorcycles.

FIG. 1 is a diagram showing an overall outline of a theft detection system including a theft detection device and a theft detection cable according to the present invention, and FIG. 2 shows an embodiment of a theft detection device and a theft detection cable according to the present invention. FIG. 3 is a schematic view showing the overall configuration of a locking unit including the theft detection cable according to the present invention, FIG. 4 is a partially enlarged sectional view showing the structure of the tip of the theft detection cable according to the present invention, and FIG. Is a diagram showing an example of the circuit configuration of the abnormality determining means of the theft detection device according to the present invention, and FIG. 6 is an operation flowchart of the theft detection device according to the present invention.

First, an outline of a theft detection system including a theft detection cable and a theft detection device according to the present invention will be described with reference to FIG.

As shown in FIG. 1, theft detection system 1
Is composed of a theft detection device 3, a GPS satellite 5, a satellite reference station 6, a base station 7, and a monitoring center 8.

The GPS satellites 5 are satellites that orbit the earth in a low orbit, and each emits a radio wave serving as an information source for calculating the position. The satellite reference station 6 is for each G
The position error information is calculated based on the radio waves transmitted from the PS satellite 5. The base station 7 relays communication by the mobile phone system between the theft detection device 3 and the communication network. A position information management server 8a and a monitoring server 8b are provided in the center device of the monitoring center 8. Location information management server 8
“A” calculates highly accurate latitude / longitude information by adding the error information of the GPS satellite 5 of the satellite reference station 6, the position information of each base station 7, etc. to the position information from the theft detection device 3. The theft detection device 3 is mounted on the motorcycle 9 that is a theft detection target, and has a GPS position measurement function of receiving a signal from the GPS satellite 5 and determining the position on the ground.

The highly accurate position information from the position information management server 8a of the monitoring center 8 is normally returned to the theft detection device 3, but this position information is also available from the monitoring server 8b. . In addition, the location information management server 8
Although a is installed in the center device of the monitoring center 8 in FIG. 1, it may be installed outside the monitoring center 8 independently and connected to the communication network.

When the theft detection device 3 detects a theft abnormality of the motorcycle 9, the theft detection system 1 obtains the current position of the motorcycle 9 from the position information management server 8a and sends it to the monitoring server 8b together with the abnormality signal. report. In the monitoring center 8, the monitoring staff constantly monitors the monitoring server 8b.
When the monitoring server 8b receives an abnormal signal or the like, the fact is displayed on the display. The observer looks at this display and takes appropriate measures such as telephone contact with the user and sending the emergency response personnel to the site.

Next, the theft detection cable 2 according to the present invention.
The configuration of the theft detection device 3 will be described. As shown in FIG. 2, the theft detection device 3 is generally configured to include a lock unit 11 including the theft detection cable 2, a theft monitoring unit 12, and a notification unit 13.

As shown in FIG. 3, the locking portion 11 has a housing 14 fixed at a predetermined position of a motorcycle as an object of theft detection, and a base end portion 2a housed in the housing 14 and the tip portion 2 thereof.
Wire cable 2 as a theft detection cable that extends out of housing 14 as a free end, engagement / disengagement means 15 for engaging and disengaging tip 2b of wire cable 2 and housing 14, and housing The wire cable 2 is arranged in the body 14.
And a winding mechanism 16 which can freely wind / unwind from the base end 2a side.

As shown in FIG. 3, the housing 14 is provided with a lock part 1.
It forms the main body 1 and is configured in a substantially rectangular shape. This housing 14
Is firmly tightened and fixed to a predetermined position of the motorcycle 9 with a bolt or the like through a mounting metal fitting (not shown). This allows
The housing 14 is designed so that it cannot be easily removed from the motorcycle 9.

Insertion holes 17 and 18 through which the wire cable 2 can be inserted are formed at two locations on one side surface of the housing 14. One of the insertion holes 17 has a diameter equal to that of the wire cable 2
The outer diameter of the wire cable 2 is larger than the outer diameter of the wire cable 2, and is smaller than the engaging portion 29 of the wire cable 2 described later. The other insertion hole 1
The diameter of 8 is the wire cable 2 and the wire cable 2
Is formed to be larger than the engaging portion 29. Then, the wire cable 2 extends to the outside of the housing 14 from one of the insertion holes 17 with the distal end portion 2b as a free end with the base end portion 2a housed in the housing 14. Note that FIG. 3 shows a state in which the wire cable 2 is fixedly connected to the housing 14 by the engaging / disengaging means 15.

A display 19 is provided on the outer surface of the housing 14. In the example of FIG. 3, the display is an LED 19 and the wiring structure thereof is illustrated. An anode terminal and a cathode terminal of the LED 19 are connected to the theft monitoring unit 12 side via an internal wiring 20 inside the housing 14. This LED 19
Lights up when the wire cable 2 is energized to notify the outside that the motorcycle 9 is being monitored for theft.

Further, on the outer surface of the casing 14, operation buttons 21 for fixing / releasing the tip portion 2b of the wire cable 2 to the casing 14 and rotating / stopping the winding portion 16a of the winding mechanism 16 are operated. Is provided. The operation button 21 is always urged in a direction to be pushed back by an urging means 22 such as a spring or a spring. That is, the operation button 21
When the pressing is released, the urging force of the urging means 22 can automatically return to the original position (the position indicated by the alternate long and short dash line in FIG. 3).

As shown in FIG. 3, at the bottom of the operation button 21, a plate-like engagement piece 23 interlocked with the depression of the operation button 21 is provided. This engagement piece 23, as shown in FIG.
The tip is bent into an L shape to form a claw 23a.
The engaging piece 23 has an engaging portion 2 of the wire cable 2 described later.
Engagement holes 23b into which 9 are engaged are formed. The engaging hole 23b forms a part of the structure of the engaging / disengaging means 15, and the operation button 2
The engaging piece 23 is formed so as to face the other insertion hole 18 of the housing 14 when 1 is pressed. Engagement piece 23
Is the claw 2 at the tip when the operation button 21 is not pressed.
3 a meshes with the gear train 16 b of the winding mechanism 16.
This prevents the winding portion 16a of the winding mechanism 16 from rotating. On the other hand, when the operation button 21 is pressed, the engagement between the claw 23b of the engagement piece 23 and the gear train 16b of the winding mechanism 16 is released. This allows
The winding portion 16a of the winding mechanism 16 is rotatable, and the wire cable 2 can be easily unwound by pulling it out by hand.

The operation button 21 is constructed so that it can be prevented from being pressed by a dial lock or the like (not shown). Thereby, it is possible to prevent the operation button 21 from being inadvertently pressed and operated.

The wire cable 2 has a pair of signal lines 24 and 25 made of a flexible conductor. The wire cable 2 in this example has a coaxial structure in which one signal line 24 forms a central conductor (core wire) and the other signal line 25 forms an outer conductor. Therefore, as shown in FIGS. 3 and 4, the periphery of one signal line 24 serving as a central conductor is covered with the insulating member 26, and the other signal line 25 serving as an outer conductor is formed around the insulating member 26. The periphery of the other signal line 25 is covered with an insulating member 27.

The wire cable 2 is formed of a thin wire having an outer diameter of about 3 mm, for example. Further, as the material of the pair of signal lines 24 and 25, a wire material having high conductivity, strength and flexibility is used. This allows
The wire cable 2 can be wound by the winding mechanism 16 from the base end 2a side. More specifically, a nickel-plated wire, a stainless-plated wire, or the like is used as the outer conductor 25, and by braiding these wires into a stranded wire, preferable strength and flexibility can be obtained.

The tip of the central conductor 24 of the wire cable 2 and the tip of the outer conductor 25 are connected via a resistor 28 having a predetermined resistance value. This resistor 28
Is a wire cable 2 having a sufficiently large value as compared with the line resistance of the wire cable 2. Specifically, the line resistance of 10
It is preferable to use the resistor 28 having a large resistance value of 0 times or more.

In the wire cable 2, the base end 2a is the casing 1
4 is attached to the winding portion 16a of the winding mechanism 16 and the tip portion 2b extends outside the housing 14 from one insertion hole 17 of the housing 14 as a free end.

An engaging portion 29, which is a part of the structure of the engaging / disengaging means 15, is fitted to the tip portion 2b of the wire cable 2. The engaging portion 29 has a tapered end portion, and is formed of a substantially cylindrical member having a diameter larger than the outer diameter of the wire cable 2. A permanent magnet 30 is embedded inside the engaging portion 29. Further, a notch 29a is formed in the outer peripheral portion of the engaging portion 29 at a midway position. The notch portion 29 a is provided in the engagement hole 2 of the engagement piece 23 when the tip portion 2 b of the wire cable 2 is fixed to the housing 14.
3b is engaged.

A reed switch 31 that opens and closes the contacts in response to a magnetic force is provided inside the housing 14. The reed switch 31 constitutes, in combination with the permanent magnet 30, an engagement / disengagement detection means 32 for detecting whether or not the wire cable 2 is in the engaged state or the detached state with respect to the housing 14. The reed switch 31 is arranged at a position facing the permanent magnet 30 in the engaging portion 29 of the wire cable 2 when the tip portion 2b of the wire cable 2 is fixed to the housing 14. The reed switch 31 has one end connected to the center conductor 24 of the wire cable 2 and the other end connected to the theft monitoring unit 12 side via the internal wiring 20 and the lead wire 52.

The winding mechanism 16 has a winding portion 16a formed in a substantially disk shape inside the housing 14. The winding portion 16a is rotatably supported by the inner surface of the housing 14 so that the central axis of the winding portion 16a can wind and unwind the wire cable 2.

The base portion 2a of the wire cable 2 is connected to the winding portion 16a. In addition, the winding portion 16a
Is always biased in the rotational direction in the winding direction of the wire cable 2 by a biasing means (not shown). Further, a gear train 16b is formed along the circumferential direction on the outer peripheral edge of the winding portion 16a. The gear train 16b meshes with the piece claw 23a formed at the tip of the engagement piece 23 in a state where the operation button 21 is not pressed.

Next, the structure of the theft monitoring unit 12 will be described. The theft monitoring unit 12 uses electric power from a vehicle-mounted battery of the motorcycle 9 as a driving power source. The theft monitoring unit 12 is separately provided separately from the housing 14 of the locking unit 11, and is provided, for example, under the seat of the motorcycle 9.

As shown in FIG. 2, the theft monitoring section 12 has a remote control transmitter 41, a remote control receiver 42, a signal discriminating means 44, a lock / disengagement discriminating means 45, and a mode which are owned by the user who owns the motorcycle 9. It comprises a switching means 46, a vibration waveform discrimination means 47, a cable monitoring means 48, a buzzer 49 as an informing means, and a notification interface (report I / F) 50.

The remote control transmitter 41 transmits a mode switching signal to the remote control receiver 42 by a radio signal such as infrared rays by an operation of the owner of the motorcycle 9, for example. As the mode switching signal, two kinds of signals, a mode switching ringing signal and a mode switching non-ringing signal, can be transmitted, and one of the signals from the remote control transmitter 41 is transmitted from the remote control receiver 42.
Sent to. In addition, the wireless signal transmitted from the remote control transmitter 41 includes an ID code unique to the remote control transmitter 41.

Here, the mode switching ringing signal means that the mode is switched between a monitoring mode in which the motorcycle 9 is monitored for theft and a non-monitoring mode in which the motorcycle 9 is not monitored for theft, and at the same time, a buzzer 49 as a notification means. Is a signal for ringing. In addition, the mode switching non-ringing signal is a signal for performing only mode switching between the monitoring mode and the non-monitoring mode and not ringing the buzzer 49 as the notification means.

The remote control receiver 42 is the remote control transmitter 4
When receiving the wireless signal from No. 1, the received signal is output to the signal discriminating means 44. The signal received at that time includes an ID code for authenticating whether or not the signal is from a predetermined remote control transmitter 41.

The signal discriminating means 44 is the remote control receiver 42.
When the mode switching signal including the ID code is input from, it is determined whether or not the ID code is the signal from the predetermined remote control transmitter 41. Then, the signal discriminating means 44 outputs the mode switching ringing signal or the mode switching non-ringing signal to the mode switching means 46 when the ID code authentication is judged to be OK.

Here, the monitoring mode means that the wire cable 2 is energized to constantly detect a voltage, a vibration pulse from a vibration sensor 51 described later is detected, and the motorcycle 9 is stolen on the basis of these detection results. Is a mode for monitoring. The non-monitoring mode is a mode in which the power supply to the wire cable 9 is stopped, the detection of the vibration pulse from the vibration sensor 51 is stopped, and the theft monitoring of the motorcycle 9 is stopped. The LED 19 is on in the monitoring mode, and the LED 19 is off in the non-monitoring mode.

The engagement / disengagement determining means 45 determines whether or not the tip portion 2b of the wire cable 2 is fixedly connected to the housing 14. This determination is made based on the energized state of the wire cable 2 due to the opening and closing of the contact of the reed switch 31. That is, the engaging portion 29 of the wire cable 2 is inserted into the engaging hole 23b of the engaging piece 23, and the wire cable 2 is locked. In this state, the contact point of the reed switch 31 is closed by the magnetic force of the permanent magnet 30 incorporated in the engaging portion 29 to energize the wire cable 2, and when a normal voltage is detected, the tip portion 2b of the wire cable 2 is casing. It is determined that the body 14 is fixedly connected.

In this embodiment, the wire cable 2 is energized to determine engagement / disengagement. However, the present invention is not limited to this. For example, the engaging portion 29 is inserted into the engaging hole 23b. It may be determined whether or not this is detected by the push button switch.

The mode switching means 46 is a signal discriminating means 45.
The current mode is controlled to switch from the monitoring mode to the non-monitoring mode or from the non-monitoring mode to the monitoring mode based on the input from the.

That is, when the mode switching ringing signal is input from the signal discriminating means 45, the wire cable 2 is energized for a moment from the energizing means 48c, and whether the wire cable 2 is engaged by the engagement / disengagement determining means 45. Determine whether or not.
Here, if it is in the engaged state, the buzzer 49 is caused to ring and the LED 19 is turned on / off when the mode is switched. The user recognizes that the mode has been changed by sounding the buzzer 49 and turning on / off the LED 19.

On the other hand, if the wire cable 2 is not in the engaged state and is in the detached state, the mode transition from the non-monitoring mode to the monitoring mode is not performed, the buzzer 49 does not ring, and the LED
19 also remains off. Thus, the user recognizes that the monitor mode cannot be entered because the wire cable 2 is not engaged. Then, the wire cable 2 is prevented from shifting to the monitoring mode when the wire cable 2 is not securely engaged. In addition, in the case of the mode transition from the monitoring mode to the non-monitoring mode, the buzzer 49 is caused to ring and the LED 19 is turned off when the mode is switched. Further, a mode transition signal is output to the time counting means 48d described later. The user sounds the buzzer 49 and L
It is recognized that the mode has been changed by turning off the ED 19.

When a mode switching non-ringing signal is input from the signal discriminating means 45, except that the buzzer 49 does not ring,
Performs the same operation as the mode switching ring signal. This mode switching non-ringing signal is intended to prevent the neighbors from being annoyed by the ringing of the buzzer 49 when the motorcycle 9 is parked in an apartment or the like at midnight.

The vibration waveform discriminating means 47 outputs the output of a vibration sensor 51 attached to a predetermined portion of the vehicle body of the motorcycle 9 and a plurality of vibration patterns registered in advance (for example, vibration due to engine sound of the motorcycle or intentional automatic vibration). The vibration pattern due to the movement of the two-wheeled vehicle and the vibration pattern for distinguishing the strong wind) are compared with each other. Then, the determination result is output to the cable monitoring means 48.

The cable monitoring means 48 is the energizing means 48.
a, voltage detection means 48b, abnormality determination means 48c, timing means 48d, and theft presence / absence determination means 48e.

The energizing means 48a is connected to the internal wiring 20 in the housing 14 of the locking section 11 via the lead wire 52, and the pair of signal lines (the central conductor 24 and the central conductor 24) of the wire cable 2 are connected via the internal wiring 20. It is connected to the base end 2a of the outer conductor 25). As a result, as shown in FIG.
From the perspective, the lead wire 52 → the internal wiring 20 → the reed switch 31 → the internal wiring 20 → the central conductor 2 of the wire cable 2
A signal path 53 of 4 → resistor 28 → outer conductor 25 of wire cable 2 → internal wiring 20 → lead wire 52 is formed.
The energizing means 48a energizes the wire cable 2 through the signal path 53 when the mode is switched to the monitoring mode by the mode switching means 46, and sends a weak current to the wire cable 2.

The voltage detecting means 48b detects the voltage output from the wire cable 2 when the wire cable 2 is energized by the energizing means 48a through the internal wiring 20, and the detection signal (voltage value) at that time is detected. ) Is the abnormality determination means 4
It is output to 8c.

The abnormality determining means 48c is the voltage detecting means 48.
The presence or absence of disconnection or short circuit of the wire cable 2 is determined based on the voltage value detected by b. The abnormality determining means 48c is
For example, as shown in FIG. 5, two comparators 54, 5
5 and an AND circuit 56. The wire cable 2 is connected to the non-inverting terminal (+) of one comparator 54.
The reference voltage of the threshold value A for detecting the short circuit is input. Further, the inverting terminal (-) of the other comparator 55
A reference voltage of a threshold value B for detecting disconnection of the wire cable 2 is input to. Then, the detection voltage from the voltage detecting means 48b is input to the inverting terminal (−) of the one comparator 54 and the non-inverting terminal (+) of the other comparator 55. In the abnormality determining means 48c, the detection voltage detected by the voltage detecting means 48b is divided into cases using the two comparators 54 and 55, and the outputs of the two comparators 54 and 55 are ANDed to disconnect the wire cable 2. And whether or not there is a short circuit.

That is, in the abnormality determining means 48c having the configuration shown in FIG. 5, when the condition of threshold value B <detection voltage <threshold value A is satisfied, it is determined that there is no disconnection or short circuit of the wire cable 2, and it is normal. The signal is output to the clock means 48d.
On the other hand, when the detected voltage is higher than the threshold value A or lower than the threshold value B, it is determined that the wire cable 2 is broken or short-circuited, and an abnormal signal is output to the clock means 48d.

The time measuring means (timer) 48d starts the time measurement when the abnormality judging means 48c judges that the wire cable 2 is broken or short-circuited and an abnormal signal is inputted. Further, the time counting means 48d ends the time counting when a transition signal to the non-monitoring mode is input from the mode switching means 46 during the time counting.

The theft presence / absence determining means 48e is a time counting means 48.
Whether or not the motorcycle 9 has been stolen is determined based on the count time t measured by d. This theft presence / absence determining means 48
At e, it is determined that the motorcycle 9 has been stolen when a predetermined time (set time T) has elapsed since the time counting by the time measuring means 48d was started. When it is determined that the motorcycle 9 has been stolen, the buzzer 49 is sounded and an abnormal signal indicating that is output to the notification unit 13 via the notification I / F 50.

The reporting I / F 50 is the theft presence / absence determining means 4
When an abnormal signal indicating that the motorcycle 9 has been stolen is received from 8e, the abnormal signal is output to the notification unit 13.

Next, the structure of the notification unit 13 will be described. As shown in FIG. 2, the notification unit 13 is composed of a small wireless communication terminal, and includes an antenna 61, a communication unit 62, and a control unit 6.
3, storage unit 64, connection interface (connection I /
F) 65 is generally configured. This reporting unit 13
I / F65 for connection to I / F50 for reporting of theft monitoring unit 12
Is connected via wiring. The reporting unit 13 is configured separately from the housing 14 of the locking unit 11 and the main body of the theft monitoring unit 12, and is provided, for example, under the seat of the motorcycle 9 together with the main body of the theft monitoring unit 12. Has been done. The notification unit 13 receives the signal from the GPS satellite 5 shown in FIG. 1, calculates the approximate current position, and communicates with the monitoring center 8 and the like using the radio waves of the mobile phone. In addition, the notification unit 13 includes a rechargeable battery 6 built in the main body.
The power from 6 is used as a driving power source. The rechargeable battery 66 is configured to be rechargeable from the vehicle-mounted battery via the theft monitoring unit 12.

The antenna 61 receives radio waves from the GPS satellites 5 in FIG. 1 and radio waves from mobile phones. The communication unit 62 performs reception processing of the radio waves of the GPS satellite 5 from the antenna 61 and transmission / reception processing of the radio waves of the mobile phone. In addition, the communication unit 62 detects the reception state of the radio wave of the mobile phone at all times or at predetermined intervals.

The control unit 63 is composed of, for example, a microprocessor, and has the theft monitoring unit 12 via the connection I / F 65.
An abnormal signal from the monitoring center 8 or a communication command from the monitoring center 8 is received, and the measured current position information is reported to the monitoring center 8 together with the abnormal signal or alone. The processing of the control unit 63 is also executed based on the processing program stored in the storage unit 64 in advance. In addition, the storage unit 6
4 stores data calculated based on radio waves from GPS satellites 5.

Next, an operation procedure for theft monitoring by the theft monitoring system 1 configured as described above will be described step by step.

First, when the motorcycle 9 is connected to the structure 67, the wire cable 2 having the above-described structure is wound around the structure 67 such as a utility pole as shown in FIG. After that, the distal end portion 2b of the wire cable 2 is connected and fixed to the housing 14 by the engaging / disengaging means 15. As a result, the vehicle body of the motorcycle 9 is fixed to the structure 67.

The operation of connecting and fixing the tip portion 2b of the wire cable 2 to the housing 14 by the engaging / disengaging means 15 will be described. With the operation button 21 pressed down, the engaging portion 29 of the wire cable 2 is inserted through the other insertion hole 18, and the engagement hole 23 of the engagement piece 23 facing the insertion hole 18 is inserted.
The engaging portion 29 of the wire cable 2 is inserted into b. The engagement portion 29 of the wire cable 2 is inserted into the engagement hole 23b, and the depression of the operation button 21 is released with the notch portion 29a of the engagement portion 29 positioned in the engagement hole 23b. As a result, the engaging hole 23b presses the outer peripheral surface of the notch 29a of the engaging portion 29 of the wire cable 2 in conjunction with the return of the operation button 21 to the original position, and the tip portion 2b of the wire cable 2 is in contact. Is the housing 14
It is fixed against (locked state).

When the operation button 21 is pressed in the locked state, the pressing contact of the engaging hole 23b with the notch 29a of the engaging portion 29 of the wire cable 2 is released, and the wire cable 2 with respect to the housing 14 is released. The fixation of the tip portion 2b is released. At this time, the claw 23a of the engaging piece 23
The engagement between the gear train 16b and the gear train 16b of the winding mechanism 16 is also released. As a result, the winding portion 16a of the winding mechanism 16 starts to rotate in the winding direction due to the urging force, so that the engaging portion 29 of the wire cable 2 engages with the engaging hole 23b of the engaging piece 23.
The wire cable 2 is further dropped, and the wire cable 2 is wound into the housing 14 by the winding mechanism 16 from the base end portion 2a side (unlocked state).

When the wire cable 2 is wound up, the diameter of the one insertion hole 17 is smaller than that of the engaging portion 29. Therefore, the engaging portion 29 of the wire cable 2 is wound inside the housing 14. Without being taken, the engaging portion 29 is in a state of protruding from the one insertion hole 17 to the outer surface of the housing 14.

Next, the processing procedure executed by the theft monitoring unit 12 will be described with reference to the operation flowchart of FIG.

In the initial state, the mode is set to the non-monitoring mode, and is in a standby state for a mode switching signal from the remote control transmitter 41 owned by the owner of the motorcycle 9, for example. In this state, when the remote control receiver 42 receives the mode switching signal from the remote control transmitter 41 (ST1),
The signal discriminating means 44 discriminates whether or not the ID code included in the mode switching signal is a signal from the predetermined remote control transmitter 41 (ST2). When the authentication of this ID code is determined to be NG (ST2-No), the operation ends. On the other hand, if the authentication of the ID code is determined to be OK (ST2-Yes), it is determined whether or not the current mode is the non-monitoring mode (ST3).

When it is determined that the current mode is not the non-monitoring mode, that is, the monitoring mode (ST3-No), the mode switching means 46 switches from the monitoring mode to the non-monitoring mode (ST4), and the operation ends. At this time, the LED 19
Turns off and the buzzer 49 beeps briefly to notify that the mode has switched from the monitoring mode to the non-monitoring mode. When the signal from the remote control transmitter 41 is the mode switching non-ringing signal, only the LED 19 is turned off and the buzzer 49 does not ring. On the other hand, when it is determined that the current mode is the non-monitoring mode (ST3-Yes), it is determined whether the wire cable 2 is in the locked state (ST5).

Whether or not the wire cable 2 is in the locked state is determined by energizing the signal path 53 including the wire cable 2 from the energizing means 48a. It depends on whether or not a normal voltage is detected. At this time, the wire cable 2 is not in the locked state (ST5-N
o), the contact of the reed switch 31 remains open, no current flows through the signal path 53, and a normal voltage is not detected. In this case, the energization of the wire cable 2 by the energizing means 48a is stopped, and the operation ends. On the other hand, if the wire cable 2 is in the locked state (ST5-Ye
s), the contact of the reed switch 31 is closed by the permanent magnet 30 embedded in the engaging portion 29 of the wire cable 2, and a current flows through the signal path 53 to detect a normal voltage. In this case, the mode switching means 46 switches from the non-monitoring mode to the monitoring mode (ST6). At this time, the LED 19
Lights up and the buzzer 49 briefly beeps to notify that the mode has switched from the non-monitoring mode to the monitoring mode. When the signal from the remote control transmitter 41 is the mode switching non-ringing signal, only the LED 19 lights up,
The buzzer 49 does not ring.

When the mode is switched to the monitoring mode (ST
6) Then, it is determined again whether the mode switching signal is received from the remote control transmitter 41 (ST7). If a mode switching signal is received from the remote control transmitter 41 (ST7-
Yes), the mode switching means 46 switches from the monitoring mode to the non-monitoring mode (ST4), and the operation ends. At this time, the LED 19 is turned off, and the buzzer 49 briefly beeps to notify that the mode has been switched from the monitoring mode to the non-monitoring mode. The remote control transmitter 41
If the signal from is a mode switching non-ringing signal, LED
Only 19 turns off and the buzzer 49 does not ring. On the other hand, if the mode switching signal is not received from the remote control transmitter 41 (ST7-No), the output of the vibration sensor 51 is compared with the registered vibration pattern to determine whether the output is due to an abnormality (ST8).

When it is determined that the output of the vibration sensor 51 is abnormal (ST8-Yes), it means that the motorcycle 9 is vibrating due to some external factor, and the clocking means 48d starts timing. Done (ST1
0). On the other hand, when it is determined that the output of the vibration sensor 51 is not due to an abnormality (ST8-No), the detected voltage from the voltage detection means 48b is a condition of threshold B <detection voltage <threshold A. It is determined whether or not (ST
9). When the condition of threshold B <detection voltage <threshold A is satisfied (ST9-Yes), the operation returns to ST7. On the other hand, if the condition of threshold value B <detection voltage <threshold value A is not satisfied (ST9-No), the time counting means 48d starts time counting for a predetermined time (set time T) (ST1).
0).

Here, the state where the condition of threshold value B <detection voltage <threshold value A is not satisfied is first the voltage detecting means 4
This is a state in which the detected voltage of 8b shows a maximum value compared with the threshold value A of the comparator 54. In this case, the detected voltage is not consumed by the resistor 28 of the wire cable 2. That is, a short circuit occurs at any part of the signal path 53 including the wire cable 2.

Further, the state where the detection voltage of the voltage detecting means 48b shows a minimum value compared with the threshold B of the comparator 55 is also a state where the condition of threshold B <detection voltage <threshold A is not satisfied. . In this case, a disconnection state occurs at any part of the signal path 53 including the wire cable 2.

Next, it is judged whether or not the count time t by the time measuring means 48d exceeds a predetermined time T (ST1.
1). If the count time t by the clock means 48d does not exceed the predetermined time T (ST11-No), it is determined whether or not a mode switching signal is received from the remote control transmitter 41 (ST12). If the mode switching signal is not received from the remote control transmitter 41 (ST12-No), ST1
Returning to 1, the timekeeping by the timekeeping means 48d is continued. On the other hand, when the mode switching signal is received from the remote control transmitter 41 (ST12-Yes), the mode switching means 46 switches from the monitoring mode to the non-monitoring mode (ST4), and the operation ends. At this time, the LED 19 is turned off, and the buzzer 49 briefly beeps to notify that the mode has been switched from the monitoring mode to the non-monitoring mode. When the signal from the remote control transmitter 41 is the mode switching non-ringing signal, only the LED 19 is turned off and the buzzer 49 is turned off.
Does not ring.

When the counting time t by the time counting means 48d exceeds the predetermined time T (ST11-Yes), it is determined that the wire cable 2 is broken or short-circuited, an abnormal signal is output, and as an alarm ringing and reporting process, The buzzer 49 is sounded and an abnormal signal is output to the reporting unit 13 via the reporting I / F 50 (ST13).

In the above-described operation, when the wire cable 2 is in the unlocked state during the monitoring mode, that is, when the wire cable 2 falls off from the engaging hole 23b of the engaging piece 23 and comes off, the reed switch 31 is operated. The contact opens, and the signal line 53 including the wire cable 2 is disconnected. Therefore, in this case, since the detected voltage of the voltage detection means 48b does not satisfy the condition of threshold value B <detection voltage <threshold value A, the counting means 48d starts counting the predetermined time T. Then, when the count time by the time measuring means 48d exceeds a predetermined time T, it is determined that the wire cable 2 has been intentionally dropped, the buzzer 49 is sounded, and an abnormal signal is issued via the reporting I / F 50. It outputs to 13. Further, if a mode switching signal is received from the remote control transmitter 41 before the count time has passed the predetermined time T, it is determined that the wire cable 2 has dropped due to an erroneous operation,
The abnormal output is canceled and the mode switching means 46 switches from the monitoring mode to the non-monitoring mode.

Next, the operation of the notification unit 13 when the wire monitoring unit 12 detects a disconnection or short circuit of the wire cable 2 and outputs an abnormality signal from the theft monitoring unit 12 will be described.

When the reporting unit 13 receives an abnormal signal from the theft monitoring unit 12 via the connection I / F 50, it activates the GPS position measuring function, and the antenna 61 and the communication unit 62 use the G signal.
Receive a PS signal. Next, using the mobile phone function, the mobile phone is connected to the position information management server 8a via the communication network to correct the position and have the accurate current position calculated. After that, the notification unit 13 receives the accurate calculation result of the current position from the position information management server 8a, and outputs the position information and an abnormal signal from the theft monitoring unit 12 (an abnormal signal indicating that the motorcycle has been stolen). It is transmitted to the monitoring server 8b of the monitoring center 8 via the network.

In the monitoring center 8, when the monitoring server 8b receives the theft information from the reporting unit 13 or the user, the location information management server 8a confirms the current position of the reporting unit 13 and informs the user of the situation. To do. In some cases, an emergency response staff member having a response terminal is rushed to the site at the request of the user to search for the motorcycle 9 that is transmitting the abnormal signal.

As described above, according to the theft detection device 3 having the above-described structure, the signal path including the wire cable 2 as the current-carrying line having the pair of signal lines 24 and 25 whose tip portions are connected via the resistor 28. 53 is energized, and whether or not the detection voltage at that time satisfies the condition of threshold value B <detection voltage <threshold value A, the disconnection and the short circuit of the wire cable 2 are surely detected to prevent the motorcycle from being stolen. Can be detected.

For example, when a third person cuts the wire cable 2 using a wire cutter having conductivity, the pair of signal lines 24 and 25 forming the wire cable 2 are short-circuited by the wire cutter during the cutting of the wire cable 2. Since the detected voltage shows a maximum value than the threshold value A and is determined to be abnormal, the short circuit of the wire cable 2 can be instantly detected. Further, even if the wire cable 2 is cut using a tool made of a non-conductive material, if one of the pair of signal lines 24 and 25 forming the wire cable 2 is cut, the detection voltage is detected at that time. Indicates a value smaller than the threshold value B and is determined to be abnormal, so that the disconnection can be instantly detected. This makes it possible to effectively prevent theft.

Since the resistor 28 is provided at the tip of the pair of signal lines 24, 25 on the side of the engaging portion 29 of the wire cable 2 which is fixedly connected to the housing 14, the wire cable is provided as in the conventional case. Even if a detour for the current is separately formed in the middle of the path, it can be detected as a change in the detection voltage when the wire cable 2 is energized. Therefore, it is possible to reliably prevent the act of avoiding the detection of theft. You can

Further, a reed switch 31 whose contacts are opened and closed by the magnetic force of the permanent magnet 30 embedded in the engaging portion 29 of the wire cable 2 is used, and whether the voltage value of the signal path 53 including this reed switch 31 is normal or not. Since the locked state and the unlocked state of the wire cable 2 are detected by the above, the mode can be surely switched to the monitoring mode, and the theft can be prevented very effectively in the monitoring mode.

Further, since the wire cable 2 is formed of a thin wire having high strength, it is easy to handle and it is difficult to bend or cut it. Moreover, since the wire cable 2 is wound into the housing 14 by the winding mechanism 16 when not in use, the appearance can be improved and the device can be downsized.

Further, when the notification unit 13 receives a vehicle abnormality signal from the theft monitoring unit 12, it sends the current position information of the theft detection device 3 and the like to the monitoring center 8 together with the abnormality signal, so that it is stolen. The vehicle can be searched immediately.

By the way, in the present embodiment, whether or not the wire cable 2 is abnormal (disconnection or short circuit) is determined based on the voltage value when the signal path 53 including the pair of signal lines 24 and 25 of the wire cable 2 is energized. Although the configuration has been described as the determination, the configuration may be such that it is detected as a change in the current value flowing in the signal path 53.

Further, in the present embodiment, the pair of signal lines 24 and 25 of the wire cable 2 are connected to each other at their tips through the resistor 28, but a capacitor is connected in series to this resistor 28. May be. In this case, a constant pulse is constantly generated from the energizing means 48a of the theft monitoring unit 12,
A transistor that operates only when this pulse is present is converted into an intermittent current, and a change in current (change in voltage) is detected when an abnormality occurs.

Furthermore, the theft monitoring section 12 and the reporting section 13
In the above description, the driving power source is described as being supplied by the power supply from the vehicle-mounted battery, but a rechargeable battery, a dry battery or the like may be separately used as the power source.

Further, in the present embodiment, the theft detection device 3 is used.
Although the lock box 11, the theft monitoring unit 12, and the notification unit 13 are included in the three housings, the theft monitoring unit 12 may have the function of the notification unit 13.

Further, in the present embodiment, as the engaging / disengaging means 15 for fixing the wire cable 2 to the housing 14, the engaging piece 2 interlocking with the operation button 21 which is always biased in the pushing back direction.
Although the notch 29a of the engaging portion 29 of the wire cable 2 is engaged with the engaging hole 23b of No. 3, the configuration is not limited to this.

For example, a solenoid that operates based on a mode switching signal from the remote control transmitter 41 can be used. In this case, the solenoid is energized only while the monitoring mode is selected by the mode switching signal from the remote control transmitter 41, and the tip of the solenoid engages with the cutout portion 29a of the engagement portion 29 of the wire cable 2. This allows
It is possible to prevent the wire cable 2 from being accidentally dropped during the monitoring mode.

In the present embodiment, the object of theft detection is described as a motorcycle as an example. However, the object is not limited to this, and the object is not limited to a motorcycle such as a bicycle, but also a travel trunk or a bag. The same effect can be obtained when used. In this case, a rechargeable battery or a dry battery is used as the power source.

[0098]

As is apparent from the above description, according to the present invention, when the pair of signal lines of the theft detection cable are connected to the ends of the pair of signal lines through the resistors and the pair of signal lines are energized, Since the existence or non-existence of disconnection or short circuit is determined based on the detection voltage or detection current of, not only the disconnection of the theft detection cable but also the short circuit of the signal line during the disconnection is detected, and the theft detection target including the vehicle is stolen. Can be reliably detected. Moreover, even when a signal detour is separately formed in the middle of the signal line as in the conventional case and an attempt is made to carry out an act of planning, since the disconnection or the short circuit of the signal path is detected, theft detection cannot be avoided, It has the effect of preventing theft extremely effectively.

Further, when the reporting unit receives the abnormal output from the theft monitoring unit, it is configured to notify the monitoring center of the abnormal output together with the current position information of positioning, so that the stolen vehicle can be immediately searched. it can.

Further, since the engagement state or the detached state of the theft detection cable with respect to the main body is detected and an abnormal output is made when the detached state is detected during the monitoring mode, the intentional detachment of the theft detection cable is surely detected. be able to.

Further, if the detection state of the theft detection cable with respect to the main body is detected and the non-monitoring mode is entered within a predetermined time, the abnormal output is canceled, so the theft detection cable is accidentally dropped. It is possible to prevent abnormal output due to erroneous operation.

Furthermore, since the theft detection cable has a coaxial structure and the outer conductor is made of a thin wire having high strength made of a twisted wire of nickel-plated wire or stainless-plated wire, it is easy to handle and is easy to bend and cut. Can be difficult. Moreover, since the theft detection cable is wound up and stored in the housing when not in use, the appearance can be improved and the device can be downsized, which enables excellent antitheft effect and portability. Has the effect of doing.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall outline of a theft detection system including a theft detection device and a theft detection cable according to the present invention.

FIG. 2 is a diagram showing an embodiment of a theft detection device and a theft detection cable according to the present invention.

FIG. 3 is a schematic diagram showing an overall configuration of a locking unit including a theft detection cable according to the present invention.

FIG. 4 is a partially enlarged sectional view showing the structure of the tip of the theft detection cable according to the present invention.

FIG. 5 is a diagram showing an example of a circuit configuration of abnormality determining means of the theft detection device according to the present invention.

FIG. 6 is an operation flowchart of the theft detection device according to the present invention.

[Explanation of symbols]

2 ... Theft detection cable (wire cable), 3 ... Theft detection device, 9 ... Theft detection target (motorcycle), 11 ...
Locking part, 12 ... Theft monitoring part, 13 ... Notification part, 14 ... Housing, 15 ... Engaging means, 16 ... Winding mechanism, 24 ... Signal line (center conductor), 25 ... Signal line (outer conductor), 28 ... resistor, 32 ... engagement / disengagement detection means, 67 ... structure.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 1, 2002 (2002.4.1)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

Conventionally, a wire lock type locking device in which a lock is arranged at the end of a wire cable is known. However, such a locking device cannot detect the cutting of the wire when the wire is cut by using a tool such as a wire cutter.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction content]

Next, the structure of the theft monitoring unit 12 will be described. The theft monitoring unit 12 uses electric power from a vehicle-mounted battery of the motorcycle 9 as a driving power source. The theft monitoring unit 12 is separately provided separately from the housing 14 of the locking unit 11, and is disposed under the seat of the motorcycle 9, for example, except for the remote control transmitter 41.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryutoku Morimoto             6-11, Shimorenjaku, Mitaka-shi, Tokyo Seco             Mu Co., Ltd. F term (reference) 5C084 AA04 AA09 CC06 DD75 EE06                       HH03

Claims (7)

[Claims] 1. A theft detection device for detecting theft by connecting a theft detection cable for connecting a theft detection target to a structure, and detecting the disconnection of the theft detection cable. A theft detection cable in which the tip ends of a pair of flexible signal lines are connected by a predetermined resistor, and the theft detection cable with respect to a housing in which the proximal end of the theft detection cable is installed. The engaging / disengaging means for releasably engaging the tip end of the cable and the base end of the theft detection cable are connected, and the voltage applied to the signal line when the signal line is energized or the current flowing through the signal line A theft detection device, comprising: a theft monitoring unit that determines whether there is a disconnection or a short circuit in the theft detection cable based on the above, and outputs an abnormality when it is determined that there is a disconnection or a short circuit. 2. A theft detection device for a vehicle, which is connected to a theft detection cable for connecting the vehicle to a structure, and which notifies a monitoring center when detecting that the theft detection cable is cut. For a theft detection cable in which the tip ends of a pair of flexible signal lines are connected by a predetermined resistor, and a housing in which the base end of the theft detection cable is internally mounted and fixed to the vehicle And a means for engaging and disengaging the tip portion of the theft detection cable in a detachable manner, and a base end portion of the theft detection cable are connected, and a voltage applied to the signal line when the signal line is energized. Alternatively, the presence or absence of disconnection and short circuit of the theft detection cable is determined based on the current flowing through the signal line, and a theft monitoring unit that outputs an abnormal output when it is determined that there is a disconnection or a short circuit, and receives an abnormal output from the theft monitoring unit. When Theft detection apparatus according to claim abnormal signal along with the current position of the position with said vehicle that includes a reporting unit to report to the monitoring center. 3. An engagement / disengagement detection means for detecting whether the tip portion of the theft detection cable is engaged or disengaged by the engagement / disengagement means, and a mode switching means for switching to a monitoring mode or a non-monitoring mode. The theft monitoring unit outputs an abnormality when the engagement / disengagement detection unit detects a detached state during the monitoring mode, and does not output an abnormality even if the engagement / disengagement detection unit detects the detached state during the non-monitoring mode. The theft detection device according to claim 1 or 2, characterized in that: 4. The theft detection device according to claim 3, wherein the theft monitoring unit cancels the abnormal output when the device shifts to the non-monitoring mode within a predetermined time after detecting the dropped state. 5. The theft detection device according to claim 1, further comprising a winding mechanism capable of unwinding / rewinding the theft detection cable. 6. A theft detection cable for connecting a theft detection target to a structure having a signal line capable of conducting, wherein the signal line is composed of a pair of signal lines made of flexible conductors. A theft detection cable, wherein one end of the pair of signal lines is connected by a resistor. 7. The pair of signal lines has a coaxial structure composed of a center conductor and an outer conductor, and the outer conductor is formed of a stranded wire of a nickel-plated wire or a stainless-plated wire. The theft detection cable described.