JP2011141647A - Antitheft device for metal object - Google Patents

Abstract

[PROBLEMS] To install a device capable of detecting a change in vehicle height in each parking space of a parking lot, detect an illegal entry into a vehicle, issue an alarm, and prevent a tampering or theft of the vehicle in advance. An anti-theft device is provided.
A metal detection circuit comprising a sensor comprising a loop coil, a storage circuit for storing a signal value of the metal detection circuit in a state in which a metal object approaches and closes the loop coil, and a metal detection circuit. 2 is provided in conjunction with the boarding / alighting determination circuit 7 for comparing the signal value stored in the storage circuit 6 with the signal value stored in the storage circuit 6 to determine whether the comparison value is within a specified range, Alarm means 10 is provided that operates when the difference between the signal value of the metal detection circuit 2 and the signal value of the storage circuit 6 exceeds a specified range.
[Selection] Figure 1

Description

  The present invention relates to an antitheft device for metal objects, and in particular, installs a device capable of detecting a change in vehicle height in each parking space of a parking lot, detects an illegal entry into a vehicle, and issues an alarm to the vehicle The present invention relates to an antitheft device for a metal object that prevents the mischief or theft of the object.

  Conventionally, as a device for preventing theft of a car, an alarm device that gives an alarm when a door is opened or a vibration is applied, or a device that has a special processing, digital type authentication device, etc. attached to a key cylinder is known. It has been. (See Patent Documents 1 and 2)

JP 2003-174463 A JP 2003-157383 A

However, a device with special processing or a digital type authentication device attached to the key cylinder can prevent theft, but there is a problem that it cannot effectively deal with mischief or puncture on the vehicle.
In addition, since the alarm device is attached to the vehicle, the vehicle cannot be stolen unless the vehicle includes the alarm device. That is, there are many vehicles in a general parking lot, and not all vehicles are equipped with alarm devices, and it is impossible to manage the entire parking place.
The present invention has been made to solve the conventional problems, and the object of the present invention is to install a device capable of detecting a change in vehicle height in each parking space of a parking lot, An object of the present invention is to provide a metal object antitheft device that detects illegal boarding and issues an alarm to prevent tampering or theft of the vehicle.

  As a means for achieving the above object, in the antitheft device for a metal object according to claim 1, a metal detection circuit including a sensor comprising a loop coil, and a metal in a state where the metal object is stationary when approaching the loop coil A storage circuit that stores the signal value of the detection circuit, a determination circuit that compares the signal value of the metal detection circuit and the signal value stored in the storage circuit, and determines whether the comparison value is within a specified range; An alarm means is provided in conjunction with the discrimination circuit and is activated when the difference between the signal value of the metal detection circuit and the signal value of the storage circuit exceeds a specified range.

  The metal object antitheft device according to claim 2, wherein the loop coil is disposed in a parking space of a vehicle, and the storage circuit is parked and boarded in the parking space. The signal value in the positional relationship between the loop coil and the vehicle when the person gets off is stored, and the determination circuit compares the reference signal value stored in the storage circuit with the signal value during parking, and the comparison is performed in the determination circuit. The alarm means is activated when the signal value to be exceeded exceeds the specified range.

  The metal object antitheft device according to claim 3 is the metal object antitheft device according to claim 2, wherein loop coils are respectively installed in a plurality of parking spaces of a parking lot, and the channels of the respective loop coils are unified. It is characterized in that a controller to be managed is arranged.

  The metal object antitheft device according to claim 4 is the metal object antitheft device according to claim 2 or 3, further comprising a warehousing detection device for detecting the entry of the vehicle into the parking space. It is characterized by having a function of activating a warning state of the anti-theft device for a metal object after a predetermined time after detecting entry into the space.

In this invention, the following effects are acquired by employ | adopting the said structure.
The metal object antitheft device according to claim 1, wherein a resonance circuit including a sensor comprising a loop coil as one element of a resonance system, a transmission circuit configured in combination with the resonance circuit, and the metal object approaching the loop coil The memory circuit that stores the signal value of the transmitter circuit in a stationary state and the signal value of the transmitter circuit and the signal value stored in the memory circuit are compared to determine whether the comparison value is within a specified range. And a warning circuit that operates when the difference between the signal value of the transmission circuit and the signal value of the storage circuit exceeds the specified range. The movement of the metal object can be detected by installing the loop coil. Therefore, the theft of the metal object can be prevented.

  The metal object antitheft device according to claim 2, wherein the signal value of the unmanned loop coil is compared with the signal value of the oscillating circuit during parking, and the difference between the signal values exceeds a specified range. Since the alarm means is activated, it is possible to detect a decrease in the vehicle height due to illegal boarding of the vehicle. Therefore, when the vehicle is illegally boarded, the alarm means is activated to prevent the vehicle from being stolen.

  In the antitheft device for metal objects according to claim 3, since the loop coil is installed in each of a plurality of parking spaces in the parking lot and the controller for centrally managing each parking space is disposed, Even without an alarm device, all vehicles in the parking lot can be vigilance-managed.

  The metal object theft prevention device according to claim 4, further comprising a warehousing detection device for detecting the entry of the vehicle into the parking space. Since it has a function to activate the warning state of the prevention device, the warning state is reliably set after entering the parking space.

  The anti-theft device for metal objects according to the present invention is a device that activates an alarm means by detecting a vehicle height that decreases when the vehicle is illegally boarded in a parking lot. The best mode for carrying out the present invention will be described below.

FIG. 1 is a block diagram showing the configuration of the present invention.
As shown in FIG. 1, the metal object antitheft device A of the present invention detects n loop coils 1 arranged on the road surface of a parking space and a signal value based on the presence or absence of a metal object using the loop coils as sensors. n number of metal detection circuits 2, n number of determination devices 5 that measure signal values from the metal detection circuits 2 and detect whether they are within a specified range as a standard, and parking provided in the determination device 5 A storage circuit 6 for storing the signal value of the metal detection circuit 2 at the time of entering the space and the passenger getting off, and a reference signal value of the storage circuit 6 and a signal value of the metal detection circuit 2 provided in the discrimination device 5 A boarding / alighting discrimination circuit 7 to be compared, a warehousing detection circuit 8 provided in the discrimination device 5 for detecting a vehicle entering the parking space, a controller 9 for controlling the operation of the entire device, and an alarm means that operates according to a command from the controller 10 It is provided.

The metal detection circuit 2 in the present embodiment includes n resonance circuits 2a including the inductance of the loop coil as a part of the circuit, and n amplification circuits 2c that are combined with the resonance circuit 2 to form an oscillation circuit. The metal detection circuit 2 is connected to n switching circuits 3 which receive a signal from the sequencer 11 and control on / off of the operation of the resonance circuit 2. The discriminating device 5 is configured to measure the frequency of the oscillation output from the amplifier circuit 2c and detect whether or not it is within a standard frequency range as a standard.
As the metal detection circuit 2, other known circuits can be adopted as long as the circuit has a loop coil terminal and detects the presence or absence of a metal object as an electronic signal value. For example, a detection method using a PLL phase difference, a detection method using a pulse width detection method, or the like can be employed.

Each of the one loop coil 1, the metal detection circuit 2, the switching circuit 3, and the discriminating device 5 constitutes one channel. In the embodiment of FIG. 1, the channels # 1 to # 1 correspond to n loop coils. Channel #n exists.
The sequencer 11 is controlled by the controller 9 and has a function of sending signals to the n switching circuits 3 at a predetermined cycle and sequentially operating channels.

  The loop coil 1 is embedded in a loop shape on the road surface of the parking space or fixed on the road surface and functions as a sensor that reacts to the height of the vehicle parked in the parking space and the entry.

The resonance circuit 2a includes a transformer whose primary side is connected to the loop coil, and a capacitor connected to the secondary side of the transformer. An LC resonance circuit is constituted by the inductance of the loop coil and the capacitance of the capacitor viewed through the transformer. That is, the loop coil resonance circuit includes the loop coil as one element of the resonance system.
The amplifier circuit 2c is combined with the resonance circuit 2a to form a transmission circuit, and the resonance frequency by the inductance of the loop coil 1 and the capacitor of the resonance circuit 2 is supplied to the subsequent circuit as an oscillation signal.

  The switching circuit 3 is a bidirectional switching element whose ON / OFF state is controlled in accordance with a control signal from the sequencer 11. For example, a bidirectional optical MOS-FET (Moss Photo Relay) is used. As the switching circuit, a switching circuit that is turned off in a steady state and is turned on only when a control signal from the sequencer 11 is applied to operate the resonance circuit is used. It is also possible to use a type that is on in a steady state and is off only when a control signal from the sequencer 11 is applied to operate the resonance circuit 2.

The warehousing detection circuit 8 is an oscillation circuit, that is, a circuit for determining whether or not the output signal from the metal detection circuit 2 is within a preset specified range. For example, when the signal value exceeds a preset range due to the approach of the vehicle, or when the signal value suddenly increases due to the approach of the vehicle, entry is detected.
When the warehousing detection circuit 8 detects warehousing, the timer 8a activates the boarding / alighting determination circuit 7 after a predetermined time (5 to 10 minutes) after warehousing, and starts a warning state.

  The memory circuit 6 stores the signal value of the oscillation output in the empty state where the vehicle is parked in the parking space. A vehicle without an occupant is separated from the loop coil 1 because the vehicle height rises, and the signal value detected by the loop coil 1 becomes low. On the other hand, since the vehicle height of the vehicle with the occupant decreases, the distance from the loop coil 1 becomes close, and the signal value detected by the loop coil 1 increases. Therefore, by comparing the signal value of the oscillation signal by the loop coil sensor, it is possible to detect the presence or absence of a passenger and thus illegal boarding.

The boarding / alighting determination circuit 7 compares the reference signal value when the vehicle is empty stored in the storage circuit 6 with the signal value from the oscillation circuit to determine whether or not it is within the specified range. If the specified range is exceeded, it is confirmed that the vehicle height has changed, and it is determined that illegal boarding has occurred.
The signal determined by the boarding / alighting determination circuit 7 is sent to the controller 9 to activate the alarm means 10.
The controller 9 centrally manages each channel such as control of the sequencer 11, processing of an abnormal signal of the boarding / alighting determination circuit 7, and operation of the alarm means 10.

  From the sequencer 11 shown in FIG. 1, control signals S1 to Sn are sequentially generated and supplied to each switching circuit 3 respectively. For example, when the control signal S1 is supplied to the switching circuit 3 of the channel # 1, the photo switch of the switching circuit 3 is turned on. Therefore, the resonance circuit 2a is connected between the output side and the input side of the amplifier circuit 2c to form an oscillation circuit. This oscillation circuit has a resonance frequency determined by the capacitance of the resonance circuit and the inductance unique to the loop coil 1, for example, The oscillation operation is started at about 100 kHz and with a predetermined peak voltage. When there is no metal object in the vicinity of the loop coil 1, the resonance frequency is mainly determined by the inductance inherent to the loop coil and the capacitance of the capacitor of the resonance circuit. The oscillation output from the amplifying circuit 2c is supplied to the discriminating device 5, and it is detected whether or not the oscillation frequency is within a predetermined specified frequency range or whether the crest voltage is within a specified range. The For example, when a metal object is present in the vicinity of the loop coil 1, the effective inductance and Q of the loop coil change, the oscillation frequency becomes a frequency deviated from the specified frequency, and the peak voltage deviates from the specified range. Therefore, the presence or the distance of the metal object can be determined by detecting the frequency shift or the peak voltage shift.

  At this time, since the control signals S2 to Sn are not supplied to the switching circuits 3 of the other channels # 2 to #n, the photoswitches of the switching circuits 3 of the other channels # 2 to #n are turned off. . Therefore, with respect to the other channels # 2 to #n, the amplifier circuit 4 and the resonance circuit 2 are separated from each other, and the oscillation operation is not performed. In other words, since a plurality of oscillation circuits do not oscillate simultaneously, unnecessary signals such as beat signals are not generated.

Next, the operation of the metal object antitheft device will be described with reference to FIG.
As shown in FIG. 2 (a), the loop coil 1 is installed on the road surface of the parking space 12, and there is no metal object in the vicinity of the loop coil in the empty state. The transmission signal value determined by the capacitance of the capacitor indicates [00].

FIG. 2B shows a state in which the vehicle has entered the parking space 12, the inductance of the loop coil 1 changes due to the approach of the metal object, and the signal value of the oscillation circuit increases rapidly to indicate [60].
Here, when the signal value suddenly increases from [00] to [60], the warehousing detection circuit 8 detects the warehousing of the vehicle.

In FIG. 2 (c), when the passenger gets off, the vehicle height rises and the vehicle body moves away from the loop coil 1, so that the signal value of the oscillation circuit decreases and shows [50].
A few minutes after entering, the passenger leaves the vehicle and becomes empty. At this time, the warehousing detection circuit 8 sends a signal value storage command to the storage circuit 6 after 5 to 10 minutes (after a predetermined time has elapsed) by the timer setting.
The operation for sending the storage command can be performed manually by a switch operation or a remote control operation by a portable terminal.
The storage circuit 6 detects a signal value [50] of the current empty state according to a command from the warehousing detection circuit 8, and stores and sets this signal value as a reference signal value [00].
The reference signal value of the storage circuit 6 is used as a reference value to be compared thereafter in the getting-on / off discrimination circuit 7.

At the same time as the reference signal value is stored in the storage circuit 6, the boarding / alighting determination circuit 7 starts comparing the difference between the signal value of the oscillation circuit and the signal value of the storage circuit 6 (d) and (e).
As described above, since the storage circuit 6 and the boarding / alighting determination circuit 7 are operated according to the timer setting after the entry is detected, the entry detection device 8 is used for the antitheft device of the metal object after a predetermined time after detecting entry into the parking space. It has a function to activate the alert state.

If the signal value of the storage circuit 6 matches the signal value of the oscillation circuit in the boarding / alighting determination circuit 7, it is confirmed that there is no change in the vehicle height. However, if the reference signal value at the time of empty vehicle does not match the signal value from the oscillation circuit, or if the difference exceeds the specified range, it is confirmed that the vehicle height has changed, and it is determined that illegal boarding has occurred. (F).
In this case, the boarding / alighting discriminating circuit 7 sends an abnormality signal to the controller 9, and the controller 9 activates the alarm means 10 that identifies the channel and identifies the channel. The alarm means 10 is based on a method of transmitting a signal to a terminal such as a mobile phone in addition to light and voice.
In addition, while the boarding / alighting determination circuit 7 is operating, the alarm means 10 is operated even when the oscillation signal is lowered due to the disconnection of the loop coil 1.

When a regular driver gets on, in the warning state shown in FIG. 2 (e), the warning release switch of the individual boarding / alighting discrimination circuit 7 is turned on to stop the operation, and the reference signal value of the storage circuit 6 is set. Reset. As a result, a release state is entered in which no abnormal signal is transmitted from the boarding / alighting determination circuit 7 to the controller 9.
After delivery, the metal object antitheft device automatically returns to the same standby state as in FIG. 2A, for example, after 5 to 10 minutes (after a predetermined time has elapsed).
The release at the time of delivery is performed by operating a device provided in the parking lot or by a driver operating the remote control through the portable terminal from inside the vehicle.

Although the embodiments have been described above, the specific configuration of the present invention is not limited to the above-described embodiments, and design changes and the like within a scope not departing from the gist of the invention are included in the present invention.
For example, the vehicle theft has been described in the above embodiment, but the present invention is not limited to theft prevention, and can cope with a puncture accompanying a decrease in the vehicle height, a mischief on the vehicle body, and the like.
Further, as shown in FIG. 3, the loop coil 1 is installed on the bottom surface 14 or the side surface 15 of the metal safe 13 or below the passing position of the opening / closing portion of the door 16 so that the metal object is the same as in the above embodiment. It is also possible to detect the movement of. In this case, the reference signal value of the safe installation position is stored in the storage circuit in advance, and when there is a discrepancy between the reference signal value and the signal value of the transmission circuit, door opening / closing, safe movement, or theft occurred To activate the alarm means.
Furthermore, although the said Example is provided with the warehousing detection apparatus, even if it is the structure which sets a warning state manually irrespective of the warehousing detection apparatus, it is contained in this invention.

It is a block diagram which shows the structure of the antitheft device of a metal object. It is explanatory drawing which shows the effect | action of the antitheft device of a metal object. It is explanatory drawing which shows the other Example of the antitheft device of a metal object.

DESCRIPTION OF SYMBOLS 1 Loop coil 2 Metal detection circuit 2a Resonance circuit 2c Amplification circuit 3 Switching circuit 5 Discriminating device 6 Memory circuit 7 Boarding / alighting discrimination circuit 8 Storage detection circuit 8a Timer 9 Controller 10 Alarm means 11 Sequencer 12 Parking space 13 Safe 14 Bottom 15 Side 16 Door 17 Below the passing position

Claims (4)

A metal detection circuit with a sensor comprising a loop coil;
A storage circuit for storing a signal value of the metal detection circuit in a state where the metal object is stationary by approaching the loop coil;
A determination circuit that compares the signal value of the metal detection circuit and the signal value stored in the storage circuit to determine whether the comparison value is within a specified range; and
An anti-theft device for metal objects provided with an alarm means provided in conjunction with a discrimination circuit and operating when the difference between the signal value of the metal detection circuit and the signal value of the storage circuit exceeds a specified range . The loop coil is disposed in a parking space of a vehicle,
The storage circuit stores a signal value in a positional relationship between the loop coil and the vehicle in a state where the passenger gets out of the vehicle after parking in the parking space,
The discrimination circuit compares the reference signal value stored in the storage circuit with the signal value during parking,
2. The antitheft device for metal objects according to claim 1, wherein an alarm means is activated when a signal value to be compared in the discrimination circuit exceeds a prescribed range.   3. The antitheft device for metal objects according to claim 2, wherein a loop coil is installed in each of a plurality of parking spaces in a parking lot, and a controller for centrally managing the channels of each loop coil is arranged. Equipped with a warehousing detection device that detects the warehousing of vehicles into the parking space
The anti-theft of metal objects according to claim 2 or 3, wherein the warehousing detection device has a function of activating a warning state of the anti-theft device for metal objects after a predetermined time after detecting the entry into the parking space. apparatus.

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