JPS5840800B2 - Speed violation enforcement system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed enforcement system comprising, for example, a speed measuring device that utilizes the Doppler effect of radio waves, and a camera that takes pictures of the data measured by the speed measuring device and of vehicles driving in violation. It is.

First, a conventional system of this type will be briefly explained.

In FIG. 1, 1 is a vehicle to be measured, 2 is an antenna for emitting a radiation beam 3 to the vehicle and receiving reflected waves from the vehicle 1, and 4 is a gun oscillator, etc., for example. To feed the antenna 2 with a radio wave from a radio wave source as a transmission wave, and to obtain a difference frequency component between the transmission wave and the reception wave, that is, a Doppler signal 5, by frequency mixing the reception wave and the transmission wave received by the antenna 2. 6 is a counting circuit that measures the traveling speed of the vehicle 1 from the frequency of the Doppler signal 5; 7 is the output of the counting circuit 6 and is a speed signal indicating the traveling speed of the vehicle 1; 8 is a speed limit setting A comparison circuit 10 compares the speed signal 7 with the speed limit 9 and outputs an alarm signal 11 when the speed signal 7 exceeds the speed limit 9. , 12 is a data display for numerically displaying the speed signal 7; 13 is a shutter that opens and closes in response to the alarm signal 11;
This is a camera for photographing a traveling vehicle 1 and a data display 12 that displays the actually measured speed on the same film.

In addition to the speed signal 7, the data display 12 can also display, for example, time, speed limit 9, etc., but here, for convenience, only the speed signal 7 will be displayed.

Further, the spread of the radiation beam 3 from the antenna 2, that is, the radar beam, is shown by the hatched area in the figure.

In such a configuration, the counting circuit 6 is first reset by a reset signal (not shown).

In this state, when the vehicle 1 arrives within the transmitted wave beam from the antenna 2, the reflected wave is received by the antenna 2, and the transmitting/receiving circuit 4 outputs the difference frequency component between the transmitted wave and the received wave, that is, the Doppler signal 5. Ru.

The counting circuit 6 counts this Doppler signal 5 at a constant sampling rate, and treats the maximum value as the traveling speed of the vehicle.

The reason why the maximum value is treated as the traveling speed of the traveling vehicle is that the power of the reflected wave varies greatly depending on the shape of the traveling vehicle 1, the position of the traveling vehicle within the radiation beam 3 emitted from the antenna 2, etc.
The gutter signal 5 is distorted.

It's for a reason. The speed signal 7 obtained in this way is given to the data display 12 for digital display, and is also given to the comparison circuit 10 and compared with the speed limit 9 set by the switch 8, so that the speed signal 7 is If the speed limit 9 is exceeded, a warning signal 11 is output and given to the camera 13.

In the camera 13 that receives this alarm signal 11, a shutter drive mechanism such as a solenoid is activated to open and close the shutter.

As described above, this camera is designed to take a photograph of the vehicle that violates the data display 12, and the vehicle and its related traveling speed are printed on each photograph.

Photographs taken in this manner are often used as evidence in speeding enforcement enforcement.

By the way, the beam radiated from the antenna 2 has a certain spread and there may be multiple vehicles within the beam. In this case, the antenna 2 contains reflected waves from each vehicle, and the speed signal 7 is that of the vehicle with the highest speed among the multiple vehicles, but the vehicle to be photographed is within the field of view of the camera 13, and it is difficult to match the speed signal 7 with the vehicle to be photographed. The photographic evidence becomes insufficient.

This invention was made to improve these problems, and its feature is that the camera 13 is equipped with a reticle, which is marked with a thin line to indicate the photographing area of the violating vehicle in a normal photograph. If a vehicle is photographed only within a designated area, this vehicle is determined to be a speeding vehicle, and if other vehicles are photographed in other areas, it is determined that the vehicle is within the beam. This increases the evidence by allowing multiple vehicles to be judged as non-violating vehicles.

FIG. 2 shows the radiation area E of the radiation beam 3 on the road surface 14.
1 and normal photographic vehicle photographing area E taken by camera 13.
2 is a schematic diagram for explaining.

Note that the photographing area E2 of a normal vehicle taken by the camera 13 is the area where speed measurement is started by the counting circuit 6 after the traveling vehicle 1 enters the radiation beam 3, and the speed measurement is completed after a predetermined measurement time. If the vehicle is in violation, the camera 13 is operated and a photograph is taken, and the area where the vehicle 1 exists at this time is determined by the above-mentioned measurement time.

The camera 13 is installed so as to cover the radiation area E1 of the radiation beam 3 and the above-described photographing area of the violating vehicle.

The present invention resides in that the camera 13 is also provided with a freticle in an area divided by thin lines corresponding to the above-mentioned violating vehicle photographing area E2.

The camera will be explained below.

FIG. 3 is a schematic diagram of a conventional camera, 15a.

15b is a spool, 16 is a film, and 17 is a lens.

. FIG. 4 shows a camera 13, which is a feature of the present invention, and a reticle 18 is placed on the focal point.

The reticle 18 has a thin line carved into the surface of the glass plate, for example, a shape such as a hole or a mold, and the film 1
Photographed on 6.

5 and 6 show an example of a photograph 19 taken using the camera 13', and in FIG. 5, the traveling vehicle 1 is photographed only within a frame 24 surrounded by thin lines 20 to 23. Indicates that the vehicle is in violation.

That is, the area 24 within the frame corresponds to the above-mentioned violation vehicle photographing area E2.

FIG. 6 shows a case where two vehicles 1a and 1b are photographed in one photograph. Vehicle 1a is located in the violation vehicle photographing area E2, but the other vehicle 1b is roughly in the radiation beam 3. This is a case where the vehicle 1b is located in the radiation region E, and it is difficult to accurately measure the speed due to the traveling vehicle 1b, so it is not used as evidence for speeding enforcement.

Since this invention is configured as described above, it is possible to easily determine which vehicles are violating the law, and the probability of detection of the violation can be increased.

In addition to the shapes shown in FIGS. 5 and 6, there are various shapes engraved on the reticle depending on the camera used, road conditions, etc.

[Brief Description of the Drawings] Figures 1 and 2 are diagrams showing the configuration of a speed violation enforcement system that combines a speed measurement device using the Doppler effect and a camera, and Figure 3 is a schematic diagram showing a conventional camera. , FIG. 4 is a schematic diagram showing the features of the present invention, and FIGS. 5 and 6 are diagrams showing examples of photographs taken by the camera shown in FIG. 4, where 1 is a running vehicle, 2 is an antenna, 3 is a radiation beam, 4 is a transmitting/receiving circuit, 6 is a counting circuit, 7 is a speed signal, 8 is a speed limit setting switch, 9 is a speed limit signal, 10 is a comparison circuit, 1
2 is a data display, 13 is a camera, 16 is a film, 1
8 is a reticle, and 19 is a photograph. Note that the same or equivalent parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1 A camera that takes pictures with a data display that displays data on speeding vehicles and speeding violations, and a camera that measures the traveling speed of the traveling vehicle, and if the traveling speed exceeds a preset speed, a speeding violation is detected. The measuring device measures the speed of the traveling vehicle and displays the actual measured value on the data display, and also displays the actual measured value in advance. In a speed enforcement system, the camera outputs a warning signal when the speed exceeds a set speed, and the speeding vehicle and the data display are photographed on the same film. A reticle is provided with a thin line engraved to form a frame indicating an area on the film corresponding to an area where the speeding vehicle exists when the camera operates to take a picture in response to the alarm signal output from the device. speed violation enforcement system.