JPS5831640B2 - 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 traveling 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 is shown by the shaded 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,
The transmitting/receiving circuit 4 outputs a difference frequency component between the transmitted wave and the received wave, that is, a Doppler signal 5.

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 due to the shape of the traveling vehicle 1, the position of the traveling vehicle within the transmission beam 3 emitted from the antenna 2, etc. This is because it is subject to distortion.

The speed signal 7 obtained in this way is displayed on the data display 12.
is input to the comparator 1 and digitally displayed.
When the speed signal 7 exceeds the speed limit signal 9, an alarm signal 11 is output and the camera 13
be given this.

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.

Note that 14 is a strobe that flashes in response to a synchronization signal 15 output from the camera 13.

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 photographs taken in this manner must be clear because they will be treated as evidence of speeding violations.

However, since this type of system is installed outdoors, images may be blurred due to halation or backlighting.

That is, depending on the geometric positional relationship between the sun, the vehicle 1, and the camera 13, sunlight is reflected from the windshield of the vehicle 1, and the specularly reflected light enters the camera 13.
Halation occurs in front of the windshield of the vehicle 1, making it difficult to clearly see the driver's face.

Similarly, when the camera is backlit, sunlight directly enters the lens of the camera 13, resulting in an unclear photograph.

Therefore, if a photograph is taken when halation has stopped or when there is backlight, a clear photograph cannot be obtained, leading to waste of film.

This invention aims to improve these problems, and its features include a means for detecting halation or backlight, and when halation occurs or backlight occurs, only the strobe is activated by an alarm signal, and the camera is activated. The reason is that it is not activated.

Although flashing only the strobe is not actually taking a photo, it is a measure taken to draw the driver's attention, and from the driver's perspective, there is no difference from a situation where a photo is being taken. do not have.

FIG. 2 is a system configuration diagram of an embodiment of the present invention, in which 16 is a clock, 17 is a photodetector, 18 is an arithmetic unit, 19 is a switching signal which is the output of the arithmetic unit 18, and 20.21 is a switching signal. The switches 20 and 21 are in the state shown by the dotted lines in the figure when they are switched.

The above-mentioned clock 16 outputs the month, date, hour and minute, and the calculator 18 determines the position of the sun from the output of the clock 16, and detects halation or backlighting from the geometrical arrangement of the camera 13 and the vehicle 1. , a switching signal 19 is output during halation or backlighting.

The photodetector 17 is provided to detect the weather at the location where the system is installed, that is, the intensity of sunlight, and to prevent the switching signal 19 from being output when halation or backlight does not occur, such as on cloudy, rainy days, or at night.

In other words, the photodetector 17 detects weather conditions that cause halation or backlighting, and when halation or backlighting is likely to occur, the calculator 18 uses the month, day, hour and minute data output from the clock 16 to detect the camera. 13,
The geometrical arrangement of the vehicle 1 and the sun is calculated, and when halation or backlight occurs, a switching signal 19 is output and the switch 20 is operated.

This disconnects the camera 13 and the comparison circuit 10, while the switch 21 (thus disconnects the strobe 14 and the camera 13, and connects the strobe 14 to the comparison circuit 10f via the switch 20.21.

With this invention as described above, no photograph is taken during halation or backlighting, and only the strobe flashes.

Therefore, there will be no blurry pictures and no wasted film.

In the embodiment, a clock 16, a photodetector 17, and an arithmetic unit 18 are used as means for detecting backlight or halation, but there are various other means having similar functions such as optical means.

Further, although the switches 20 and 21 are shown as contact type in the embodiment, it goes without saying that they can be made contactless.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional speed violation enforcement system, and FIG. 2 is a block diagram of the speed violation enforcement system according to the present invention, in which 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, 10 is a comparison circuit, 11 is an alarm signal, 12 is a data display, 13 is a camera, 14 is a strobe, 15 is a synchronization signal, 16 is a clock, 17 is a photodetector, 18 is a calculator,
20.21 is a switch. Note that the same or corresponding parts in the figures are designated by the same reference numerals.

Claims (1)

[Claims] 1 A camera that photographs a speeding vehicle together with a data display that displays data related to exceeding the speed limit; A speed measuring device is configured to generate a warning signal when the speed exceeds a preset speed by treating the vehicle as a speeding vehicle.Actually, the speed of the vehicle is measured by the measuring device. In addition to displaying the value on the data display above, if the actual value exceeds the preset speed (in this case, an alarm signal is output and the camera above displays the speeding vehicle and the data display on the same film). (In this speed violation enforcement system, a means is provided to detect halation or backlighting at the location where the system is installed, and when halation or backlighting is detected, the camera does not take a photo, and only the strobe light flashes. A speed violation enforcement system that is characterized by: