JP2002002410A - Number plate recognition system for vehicle and electronic number plate thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a number plate recognition system for vehicle for surely specifying a wanted vehicle by utilizing not a pickup image but radio communication and electronic number plate thereof. SOLUTION: The number plate P is provided with a number plate main body 10 and an electronic unit 20 fixed within a recessed portion 11 of the number plate main body 10. The electronic unit 20 performs an abnormal display since abnormal data of the wanted vehicle is transmitted by wireless from a communication equipment of a patrol car.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle license plate recognition system and an electronic license plate thereof.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. H11-29678
No. 5 discloses a vehicle number recognition system. This vehicle number recognition system is mounted on a patrol car (a so-called police car), and includes a video camera, a character recognition device, a database device, and a display device. Here, the video camera is mounted on the front of the police car.

In the vehicle number recognition system configured as described above, while a police car is running, a license plate of a vehicle running ahead is imaged by a video camera, and image processing and character recognition are performed by a character recognition device based on the image data. The vehicle number on the license plate is read, the read data is collated with the registered data of the arranged vehicle by the database device, and based on the collation result, whether or not the vehicle is a arranged vehicle such as a stolen vehicle is recognized, and The vehicle data is displayed.

[0004]

In the above-described vehicle number recognition system, as described above, the database device provided in the police car is used to check the registered data of the arranged vehicle. After transmitting the data wirelessly and comparing it with the registered data on the vehicles arranged at the center, the inconvenience of having this collation result transmitted wirelessly, or the terminal device when transmitting the vehicle number data to the center wirelessly It may be possible to eliminate the troublesome input operation and the occurrence of an operation error during the input operation.

However, in the vehicle number recognition system, as described above, the license plate of the vehicle traveling ahead is imaged by the video camera. For this reason, if the license plate is dirty, the image data captured by the video camera is data with the license plate being dirty, and the character recognition device cannot correctly read the vehicle number with such data. As a result, there is a problem that the collation by the database device cannot be performed correctly.

[0006] Even if it is determined that the traveling vehicle in front is a stolen vehicle or the like, even if it is determined that the traveling vehicle escapes simply by taking an image with a video camera, the vehicle is required to be arranged at an angle. There is also a problem that it is wasted to find that there is.

[0007] In order to cope with the above problems, the present invention utilizes wireless communication instead of imaging.
It is an object of the present invention to provide a vehicle license plate recognition system for reliably specifying a vehicle to be arranged and an electronic license plate thereof.

[0008]

In order to solve the above-mentioned problems, an electronic license plate for a vehicle according to the first aspect of the present invention comprises a license plate body (10) and a surface of a part of the license plate body. An electronic unit (20) provided from the side is provided outside the vehicle. Then, the electronic unit is connected to external communication means (30,
Receiving processing means (21, 22, 1) for receiving the abnormal information wirelessly transmitted from the receiving apparatus (40, 50) and displaying the abnormal information;
30, 132, 140) and display means (25) for displaying an error based on the display processing of the reception processing means.

As described above, since the abnormality information of the vehicle is displayed on the electronic license plate itself, it is possible to reliably specify that the vehicle is a arranged vehicle regardless of whether the vehicle moves.

A vehicle license plate recognition system according to a second aspect of the present invention includes an electronic license plate (P) provided outside the first vehicle (A) and a second license plate.
A communication device (30) mounted on the vehicle (B). And the license plate is the license plate body (1
0), and an electronic unit (20) provided on a part of the license plate main body from the front side.

The electronic unit receives an instruction from the communication device by wireless transmission and wirelessly transmits the unique data of the first vehicle to the communication device (21, 22, 11).
1) and receiving processing means (21, 22, 13) for wirelessly transmitting and receiving the abnormal data and displaying the abnormal data.
0, 132) and display means (25) for displaying an abnormality of the first vehicle based on the display processing of the reception processing means.

The communication device includes a recording means (35) for recording search data of the arranged vehicle, and a reception matching means (31, 32, 32) for wirelessly receiving the transmission unique data from the electronic unit side transmission means and matching the search data with the search data. 221 and 222), and communication device-side transmitting means (31, 32, 231) for wirelessly transmitting the command and for wirelessly transmitting abnormal data when the unique data matches the search data by collation by the reception collating means.

[0013] By using the electronic license plate having the above structure, when the vehicle is determined to be the arranged vehicle as a result of the collation, the result is notified to the license plate by wireless communication, and the arranged vehicle is partially disposed on the license plate. Is displayed abnormally by the display means. Therefore, it is possible to provide a vehicle license plate recognition system that can achieve the functions and effects of the first aspect of the present invention. In addition, since the electronic license plate is transmitted by wireless communication, recognition by collation with the license plate is reliably performed without being affected by dirt on the license plate as in the case of a camera.

A vehicle license plate recognition system according to a third aspect of the present invention provides an electronic license plate (P) mounted outside the vehicle (A) and a communication device (50) mounted on the road. ). The license plate includes a license plate body (10) and an electronic unit (20) provided on a part of the license plate body from the front side.

The electronic unit receives an instruction by wireless transmission from a communication device and wirelessly transmits vehicle-specific data to the communication device (21, 22, 111).
Receiving processing means (21, 22, 132, 1) for wirelessly transmitting and receiving abnormal data and displaying the abnormal data.
30) and display means (25) for displaying an abnormality of the vehicle based on the display processing of the reception processing means.

The communication device includes recording means (35) for recording search data of the arranged vehicle, and reception collation means (31, 32, 32) for wirelessly receiving transmission specific data from the transmission means on the electronic unit side and collating the data with the search data. 221 and 222), and communication device-side transmitting means (31, 32, 231) for wirelessly transmitting the command and for wirelessly transmitting abnormal data when the unique data matches the search data by collation by the reception collating means.

Thus, the same function and effect as the second aspect of the invention can be achieved between the electronic license plate and the roadside communication device.

A vehicle license plate recognition system according to a fourth aspect of the present invention includes an electronic license plate (P) mounted outside the vehicle (A) and a license plate installed at the home of the owner of the vehicle. Communication device (40). The license plate includes a license plate body (10) and an electronic unit (20) provided on a part of the license plate body from the front side.

The electronic unit receives a command from a communication device by wireless transmission and receives the command, and determines whether or not there is communication with the vehicle within a predetermined time based on time lapse data indicating time lapse after the reception. 21, 22, 132, 140)
And display means (25) for displaying an abnormality of the vehicle based on the determination by the reception determination means that there is no communication. Also,
The communication device is a communication device-side transmitting means (4) for wirelessly transmitting the command.
1, 42, 311).

[0020] Thus, when there is no wireless communication with the electronic license plate, it is possible to receive a report from the general public by displaying an abnormality using the display means, and early detection of a crime. Leads to.

Note that the reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiments described later.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show schematic aspects of a passenger car A, a police car B, and a garage C at the home of the owner of the passenger car A (hereinafter referred to as a home garage C) to which an embodiment according to the present invention is applied. ing. The passenger car A is provided with an electronic license plate P as shown in FIG. 1, and the license plate P is mounted on the center of the rear bumper (not shown) of the passenger car A in the left-right direction.

As shown in FIG. 3, the license plate P includes a license plate main body 10 and an electronic unit 2.
0. License plate body 10
Has a rectangular recess 11, which is formed in a U-shaped cross section from the front side to the back side of the license plate main body at the upper left corner of the license plate main body 10 shown in FIG. It is formed so as to be depressed. The land support code 12, the vehicle type code 13, the application code 14, the vehicle number 15, and the like are displayed on the surface of the license plate body 10 by applying a paint.

The electronic unit 20 has a rectangular thin shape that fits in the recess 11.
It is fixed in the recess 11 of the license plate body 10. The electronic unit 20 includes a small antenna 21 such as a loop antenna or a microstrip antenna, a communication circuit 22, and a microcomputer 2 as shown in FIG.
3, a drive circuit 24 and a display 25.

The antenna 21 is for performing wireless communication with a communication device 30 of the police car B (see FIG. 5) and a communication device 40 of the home garage C (see FIG. 2) which will be described later.

The communication circuit 22 processes the signal received by the antenna 21 and outputs the processed signal to the microcomputer 23. The communication circuit 22 processes the data transmitted from the microcomputer 23 and transmits the processed signal via the antenna 21 as a transmission signal.

The microcomputer 23 executes the license plate program in accordance with the flow chart shown in FIG. 7, and during this execution, the display of the display 25 via the drive circuit 24 and the communication between the communication devices 30 and 40 are performed. Processing for wireless communication is performed. The license plate program is stored in the ROM of the microcomputer 23 in advance.

The display 25 is formed of a liquid crystal panel. The display 25 is located in the recess 11 so that the display surface faces outward from the opening of the recess 11 of the license plate body 10. Is housed. The display 25 is driven by the drive circuit 24 under the control of the microcomputer 23, and displays a display color similar to the background color of the surface of the license plate main body 10 as a background color when the passenger car A is normal. When A is abnormal, a black circle is displayed on the display surface of the background color (see reference numeral 25a in FIG. 3).

As shown in FIG. 5, the police car B includes the communication device 30. The communication device 30 includes an antenna 31, a communication circuit 32, a keyboard 33, a microcomputer 34, and a data recording device. 35, a drive circuit 36, and a display 37.

As shown in FIG. 1, the antenna 31 is provided in a recess formed in the front left and right center of the police car B. The antenna 31 is provided in the electronic unit 20 of the passenger car A.
And wireless communication with an antenna 50 of a communication device (not shown) provided at the police station D (see FIG. 1) in charge of the government. Note that the antenna 31 can also perform wireless communication with electronic units (having the same configuration and function as the electronic unit 20) of various vehicles other than the passenger car A.

The communication circuit 32 processes the signal received by the antenna 31 and outputs the signal to the microcomputer 34, processes the transmission data from the microcomputer 34, and transmits it as a transmission signal via the antenna 31.

The microcomputer 34 executes the police car program according to the flowchart shown in FIG. 8, and during this execution, the communication circuit 32 and the keyboard 3
3. Perform processing between the data recording device 35 and the drive circuit 36. The police car program is stored in the ROM of the microcomputer 34 in advance.

In the data recording device 35, a large number of arranged vehicle data recorded in the communication device of the police station D are recorded. The communication circuit 32, the keyboard 33, the microcomputer 34, the data recording device 35, the drive circuit 36, and the display 37 are provided in the cabin of the police car B.

As shown in FIG. 2, the communication device 40 is provided in the upper part of the rear wall in the home garage C. As shown in FIG. 6, the communication device 40 includes an antenna 41 and a communication circuit 42. , And a microcomputer 43. The antenna 41 is connected to the electronic unit 20 of the passenger car A.
This is for performing wireless communication with the device.

The communication circuit 42 processes the signal received by the antenna 41 and outputs the signal to the microcomputer 43, processes the data from the microcomputer 43, and transmits it as a transmission signal via the antenna 41.

The microcomputer 43 executes the home garage program in accordance with the flowchart shown in FIG. 9, and performs processing with the communication circuit 42 during the execution. The home garage program is stored in the ROM of the microcomputer 43 in advance.

In this embodiment configured as described above, the respective processing modes in the police car B, the passenger car A and the home garage C will be described separately. (1). Processing Mode in Police Car B In the police car B in the traveling state, the microcomputer 34 of the communication device 30 starts executing the police car program according to the flowchart of FIG. Then, in step 200, the wake-up data is output to the communication circuit 32. Along with this, the antenna 31
Microcomputer 34 that has processed signals in communication circuit 32
Wake-up data is input and transmitted as a transmission signal.

Next, at step 210, it is determined whether or not a predetermined time T has elapsed. The lapse of the predetermined time T means the lapse of a predetermined waiting time (a waiting time for determining whether or not there is a response (described later) from the license plate P of the passenger car A) after the processing of the immediately preceding step 200. Elapse of the predetermined time T indicates that the passenger car A has some abnormality. Thus, step 22
If the predetermined time T elapses before the determination of YES at 0, the determination at step 210 becomes YES. The output of the wake-up data may be performed by operating the keyboard 33 by the crew of the police car B.

If the determination of YES is made in step 210 as described above before the determination of YES is made in step 220, then in step 232, the vehicle A or other vehicle equipped with an electronic license plate is Thus, display processing is performed to the effect that a vehicle located within the communicable area of the police car B has an abnormality. Based on this, the display 37 displays the above abnormality under the drive of the drive circuit 36.

On the other hand, while the wake-up data in step 200 is being output each time a determination of NO is made in step 220, that is, in each of steps 200, 210, 22
While the process of circulating 0 is repeated, police car B
However, as shown in FIG. 1, it is assumed that the vehicle follows the preceding car A. If there is a response from the electronic license plate P of the passenger car A as described later, the determination in step 220 is YES. Note that the response includes a vehicle code unique to the passenger car A stored in advance in the ROM of the microcomputer 23 of the license plate P.

In step 221, the vehicle code is read from the response of the license plate P. In step 222, a search for the arranged vehicle is performed based on the vehicle code in accordance with the data recorded in the data recording device 35. .

At this stage, if the passenger car A is not one of the arranged vehicles, the determination in step 230 is NO.
On the other hand, if passenger car A is one of the arranged vehicles, step 2
The determination at 30 is YES, and at step 231, data indicating the abnormality of the passenger car A (data representing the black circle 25 a shown in FIG. 3) for displaying an abnormality on the license plate P of the passenger car A is output to the communication circuit 32. .

Therefore, the antenna 31 is connected to the communication circuit 32
Transmits wirelessly the data indicating the abnormality from the microcomputer 34 to the traveling passenger car A as a transmission signal. Thus, the license plate P of the passenger car A is abnormally displayed with the black circle 25a as described later.

In step 232, the data indicating the abnormality is output to the drive circuit 36 as display data. For this reason, the display 37 is driven by the drive circuit 36 to display that the passenger car A is the arranged vehicle with an abnormal display. (2). Processing Mode in Home Garage C In the communication device 40 of the home garage C, when the microcomputer 43 starts executing the home garage program according to the flowchart in FIG. 9, a timer built in the microcomputer 43 is reset and started in step 300. To start timing. Thereafter, when the time counted by the timer exceeds a predetermined set time, step 31 is executed.
The determination at 0 is YES, and in step 311, wake-up data is output.

Then, the antenna 41 receives the wake-up data from the microcomputer 43 via the communication circuit 42 and transmits it as a transmission signal. If there is no response (described later) from the electronic unit 20 of the passenger car A to this transmission, the determination in step 320 is NO, and in step 332, the timer starts counting by resetting the timer.

Thereafter, steps 310 to 320
And the process of step 332 is repeated. This means that the communication device 40 periodically transmits the wake-up data to the license plate P (every time the set time in step 310 elapses) and waits for a response from the license plate P.

In such a state, the electronic unit 2
If there is a response from 0, the determination in step 320 is YES. Then, in step 321, the contents of the response are collated with a self-code (a code for uniquely associating the home garage C with the license plate P of the passenger car A) stored in advance in the ROM of the microcomputer 43, and mutual authentication is performed. Is done. This means confirming that the communication partner is a predetermined partner, that is, the license plate P of the passenger car A.

If there is an abnormality in the result of the mutual authentication, that is, if it is not the passenger car A but another vehicle, step 33
The determination at 0 is YES, and the processing after step 332 is repeated. On the other hand, if there is no abnormality, since the communication partner is the predetermined partner, step 33
If the determination at 0 is NO, data indicating that the elapsed time for communication between the license plate P and the electronic unit 20 has been cleared (hereinafter referred to as elapsed time clear data) is output to the communication circuit 42 at step 331. Is done. Accordingly, the antenna 41 is connected to the communication circuit 42
The electronic unit 2 uses the elapsed time clear data from the microcomputer 43 that has been signal-processed by the
Send to 0. (3). Processing Mode in License Plate P In license plate P, microcomputer 23 is normally in a sleep state in order to suppress power consumption. In such a state, as described above, when the communicator 30 of the police car B transmits the wake-up data as a transmission signal from the antenna 31 based on the output of the wake-up data in step 200 (see FIG. 8), the police car B When the vehicle is in a state following the preceding vehicle A as shown in the above, the electronic unit 20 of the vehicle A receives the transmission signal representing the wake-up data from the antenna 31 through the antenna 21.

Accordingly, in the electronic unit 20, the communication circuit 22 performs signal processing on the transmission signal by the reception of the antenna 21 and outputs the signal to the microcomputer 23. Then
The microcomputer 23 wakes up and starts executing the license plate program according to the flowchart of FIG. For this reason, in step 100, the timer built in the microcomputer 23 is reset and started to start measuring a predetermined interruption time.

At this stage, since the time counted by the timer of the microcomputer 23 has not reached the predetermined interruption time, a NO determination is made in step 110. Next, communication processing is performed in step 111. Specifically, the passenger car A for responding to the communicator 30 of the police car B, which is a criterion in step 220 (see FIG. 8).
The response data including the vehicle code unique to is output to the communication circuit 22.

Accordingly, the antenna 21 is connected to the communication circuit 2
The response data from the microcomputer 23 that has been subjected to the signal processing by the input unit 2 is input and transmitted to the communication device 30 of the police car B as a transmission signal. Thereby, step 220
The determination process of YES in (see FIG. 8) is performed as described above.

Thereafter, in step 120, if there is no transmission signal indicating the elapsed time clear data from the communication device 40 of the home garage C, the determination is NO. Accordingly, if a transmission signal representing abnormal data (see step 231) from the communication device 30 of the police car B has been input to the microcomputer 23 as abnormal data through the antenna 21 and the communication circuit 22, at step 130, Y
A determination of ES is made.

Next, at step 131, the abnormality flag F is set, and at step 132, the abnormality data representing the black circle 25a is output to the drive circuit 24 based on the abnormality data representing the arranged vehicle. Therefore, the display 2
5 is driven by the drive circuit 24, and displays an abnormal display with a black circle 25a as illustrated in FIG.

In step 120, YE
If the determination is S, in step 121, the timer of the microcomputer 23 is reset based on the elapsed time clear data. Accordingly, the microcomputer 23 returns to the sleep state.

When the timer period of the microcomputer 23 reaches the predetermined interruption time and the timer interruption processing is performed, the determination in step 110 becomes YES. Here, when a transmission signal from the communication device 40 in the home garage C is input to the microcomputer 23 through the antenna 21 and the communication circuit 22 as the elapsed time, the elapsed time is read in step 112. This elapsed time corresponds to the elapsed time since the electronic unit 20 last communicated with the communication device 40 of the home garage C.

Here, if the elapsed time has passed the set time Ts (corresponding to a time indicating that the passenger car A has been away from the home garage C for a long time), the passenger car A will remain in the home garage for a long time. Step C 140
Is YES. And step 131
Then, the abnormality flag F is set, and the abnormality processing in step 132 is performed in the same manner as described above. Thereby, the abnormal display of the black circle 25a is made on the license plate P in the same manner as described above. If the elapsed time is equal to or shorter than the set time Ts, the determination in step 140 is NO, and the microcomputer 23 returns to the sleep state.

As described above in each processing mode,
An electronic license plate P is fixed to a rear bumper of the passenger car A, and an antenna 31 of a communication device 30 is provided at a front portion of the police car B. The communication device 30 allows the license plate of the passenger car A to precede the vicinity of the police car B. Communicates with the electronic unit 20 of P, reads the vehicle code of the passenger car A,
Based on this vehicle code, the recorded data of the data recording device 35 is searched, and it is checked whether or not the passenger car A is a arranged vehicle.

As described above, whether or not the passenger car A is the arranged vehicle is checked based on the record data of the data recording device 35 mounted on the police car B itself, so that it can be quickly determined on the spot whether or not the passenger car A is the arranged vehicle. In addition, since it is checked whether or not the passenger car A is a arranged vehicle by using wireless communication between the license plate P and the communication device 30 without using an imaging unit such as a camera, the surface of the license plate P is dirty. Also,
Passenger car A can be reliably specified. Therefore, the arrest rate of the arranged vehicles can be increased. This can be similarly achieved even when the police car B approaches the stopped passenger car A.

As described above, after the passenger car A is determined to be the arranged vehicle, the communication device 30 of the police car B
From the electronic unit 20 of the license plate P of the passenger car A
In addition, a notification that the passenger car A is the arranged vehicle is given by wireless communication, and an abnormal display indicating that the passenger car A is the arranged vehicle is displayed on the display 2.
Perform 5 on the license plate P. Therefore, it can be seen that the passenger car A is the arranged vehicle at a glance. Therefore, even if the passenger car A once escapes from the place, it is easily understood that the passenger car A is the arranged vehicle, and as a result, a report from a general citizen and a police officer on patrol are found. Therefore, it helps to improve the arrest rate of the arranged vehicles.

Here, even if the electronic unit 20 is intentionally removed from the license plate P,
Since the recess remains as described above, it can be seen at a glance that it is abnormal, and it is easy to find it as an arranged vehicle. In addition, the surface of the above-mentioned recess is
If an abnormality is colored so as to specify the abnormality, the abnormality can be found more easily.

Further, as described above, the communication device 40 for wirelessly communicating with the license plate P of the passenger car A is installed in the home garage C, and the wireless communication is performed by the self-association that uniquely associates the passenger car A with the home garage C. I did it with code. This means that the wireless communication is performed on a one-to-one basis between the license plate P and the communication device 40, and is not performed with a communication device of another vehicle. .

Therefore, as described above, the determination of YES in step 140, in other words, the wireless communication between the license plate P and the communication device 40 is performed for the set time T.
If it is not during s, that is, from one day to several days, an abnormality is displayed on the license plate P as described above (see step 132). That is, when the car A is stolen, the car A cannot communicate with the communication device 40 in the home garage C. Therefore, the abnormal display on the license plate P as described above indicates the lapse of the set time Ts. Sometimes, it is easy to see that passenger car A was stolen.

When the communication device 40 is stolen from the home garage C together with the passenger car A, the abnormality display on the license plate P cannot be performed when the set time Ts has elapsed as described above. When moving from a predetermined place in the home garage C, the self-code required for the above-described communication is erased to disable normal communication, or the wireless communication is performed by the operation of the authorized owner of the passenger car A, At this time, wireless communication between the communication device 40 and the license plate P by another person can be disabled by a method such as inputting a password.

Further, as means for detecting the movement of the communication device 40, a detector such as a microswitch is provided at the bottom of the communication device 40, and this detector operates when the communication device 40 is lifted to activate the communication device 40. May be deleted, and a switch that operates when the communication device 40 vibrates due to the movement of the communication device 40 may be provided.
The internal data of 0 may be deleted. In any case, a circuit driven by a battery is provided in the communication device 40 so that the external power supply may be cut off.

In the method using the above-mentioned password, the communication device 4
The communication device 40 is operated only when the owner inputs a password set in advance by using a numeric keypad or the like incorporated in the “0”. The personal identification code may be a vehicle code used for mutual authentication with the license plate P. In the communication device 40, the inputted security code may be stored in the RAM, and when not used, the power may be turned off to automatically erase the inputted security code. As a result, the communication device 40 cannot communicate with the license plate P unless a new security code is input.

FIG. 10 shows a modification of the above embodiment. In this modification, the electronic unit 20 of the passenger car A described in the above embodiment is replaced by the communication device 30 of the police car B.
In addition to or in place of the communication device 30, a roadside communication device 50 (communication device 30) installed at a predetermined height by a column on the road
The communication device 30 has the same configuration and function as
The same processing as the processing between the steps is performed. As a result, the patrol car B can also be operated by the communication processing between the license plate P of the traveling car A and the roadside communication device 50.
Can be achieved substantially the same effect as the communication effect between the communication device of the police car B and the license plate P when the vehicle is stopped.

In the above-described embodiment, an example has been described in which the communication device 40 of the home garage C periodically transmits wake-up data as a transmission signal (see steps 300 to 320 and step 332). By providing the vehicle detection means in the communication device 40, the wake-up data may be transmitted as a transmission signal when the vehicle is detected.

Further, in the above embodiment, the example in which the license plate P is provided on the rear bumper of the passenger car A has been described. License plates P on both rear bumpers
May be provided. Further, the license plate P is not limited to the front bumper and the rear bumper, and may be provided at an appropriate place outside the passenger car.

In the above-described modified example, the example in which the present invention is applied between the license plate P of the passenger car A and the roadside communication device 50 has been described. However, instead of this, an intersection, a tollgate on a toll road, A communication device similar to the roadside communication device 50 is installed at various places such as a parking lot entrance and the like, and the same operation and effect as in the above-described modified example are achieved by communication between the communication device and the license plate P. Is also good.

In implementing the present invention, the display 25
May be various light sources such as a light emitting diode.

In practicing the present invention, the license plate P may be provided outside various vehicles such as buses and trucks, not limited to the passenger car A.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a side view of the home garage in the embodiment.

FIG. 3 is an enlarged front view of an electronic license plate of the passenger car of FIG. 1;

FIG. 4 is a block diagram of an electronic unit provided on the license plate of FIG. 3;

FIG. 5 is a block diagram of a communication device mounted on the police car of FIG. 1;

FIG. 6 is a block diagram of a communication device in the home garage of FIG. 2;

FIG. 7 is a flowchart showing the operation of the microcomputer of FIG.

8 is a flowchart showing the operation of the microcomputer shown in FIG.

FIG. 9 is a flowchart showing the operation of the microcomputer of FIG.

FIG. 10 is a schematic side view showing a modification of the embodiment.

[Explanation of symbols]

10: License plate body, 20: Electronic unit, 3
0, 40, 50: communication device, 21, 31, 41 ... antenna, 22, 32, 42 ... communication circuit, 23, 34, 43 ...
Microcomputer, 25 display, 35 data recording device, P license plate.

Claims (4)

[Claims] An electronic license plate provided outside a vehicle, comprising a license plate main body (10) and an electronic unit (20) provided on a part of the license plate main body from the front side thereof. The electronic unit is provided with external communication means (30, 40, 5).
0) wirelessly transmits and receives the abnormal information from the receiving processing unit (21, 22, 130, 1).
32, 140) and display means (25) for displaying an abnormality based on the display processing of the reception processing means. 2. An electronic license plate (P) provided outside a first vehicle (A), and a communication device (30) provided on a second vehicle (B), wherein the license plate comprises: License plate body (1
0), and an electronic unit (20) provided on a part of the license plate main body from the front side thereof. The electronic unit receives a command by wireless transmission from the communication device, and transmits the unique data of the first vehicle. Transmission unit (21, 22, 111) for wirelessly transmitting to the communication device
Receiving processing means (21, 22, 130, 1) for receiving abnormal data by wireless transmission and displaying the abnormal data.
32), and display means (25) for displaying an abnormality of the first vehicle based on the display processing of the reception processing means, wherein the communication device includes a recording means (35) for recording search data of the arranged vehicle; A receiving matching unit (31, 32, 221, 222) for wirelessly receiving the transmission specific data from the electronic unit-side transmitting unit and matching it with the search data; wirelessly transmitting the command; When the unique data matches the search data, the communication device-side transmission means (31, 32,
231). 3. An electronic license plate (P) mounted outside the vehicle (A) and a communication device (5) mounted on the road.
0), and the license plate is a license plate body (1).
0), and an electronic unit (20) provided on a part of the license plate main body from the front side thereof. Electronic unit-side transmission means (21, 22, 111) for wirelessly transmitting to the communication device;
Receiving processing means (21, 22, 130, 13) for receiving abnormal data by wireless transmission and displaying the abnormal data
2) and display means (25) for displaying an abnormality of the vehicle based on the display processing of the reception processing means. The communication device includes: a recording means (35) for recording search data of the arranged vehicle; A receiving matching unit (31, 32, 221, 222) for wirelessly receiving the transmission specific data from the unit-side transmitting unit and matching the search data; and wirelessly transmitting the command. When the unique data matches the search data, the communication device-side transmitting means (31, 32,
231). 4. An electronic license plate (P) installed outside the vehicle (A), and a communication device (40) installed at home of the owner of the vehicle, wherein the license plate has a number. Plate body (1
0), and an electronic unit (20) provided on a part of the license plate body from the front side thereof. The electronic unit receives a command from the communication device by wireless transmission and receives the command. Reception determining means (21, 22, 132, 140) for determining the presence or absence of communication with the vehicle within a predetermined time based on the time lapse data representing the time lapse. A vehicle license plate recognition system comprising: display means (25) for displaying an abnormality; and the communication device includes communication device-side transmission means (41, 42, 311) for wirelessly transmitting the command.