JPH0587565A - Distance detector - Google Patents

Abstract

PURPOSE:To perform safe operation by calculating the distance up to an objective moving body from the angles of emitted light and reflected light and emitting an alarm when the distance is a predetermined value or less. CONSTITUTION:The laser beam 6 emitted from a laser beam emitter 3 impinges against a reflecting plate 5 to be diffused and reflected. A part of reflected beam 7 passes through the receiving lens in a laser beam receiver 4 to impinge against a photodetector. The photodetector converts the moving quantity of the beam spot of the laser beam moving on the photodetector due to the movement of the distance between cars to an electric signal. A distance calculator 8 fitted with an alarm inputs said signal to operate the moving quantity of the beam spot as an angle to calculate the distance between cars and the output thereof is sent to a distance-between-cars display meter 9 to be displayed thereon. When the distance between cars becomes a preset predetermined value or less, an alarm is emitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance detecting device for automatically measuring the distance between running vehicles (automobiles, locomotives, trains, linears) or the distance between aircraft in flight and issuing an alarm.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a vehicle-to-vehicle distance L ₁ between a forward vehicle 2 and an own vehicle 1 is a vehicle-to-vehicle distance marker provided on a highway or the like. Most of the roads except the section are judged by the driver's visual inspection, and in the case of a vehicle traveling on a guideway, in the case of a signal failure, a method of knowing the accurate inter-vehicle distance between the own vehicle and the preceding vehicle There was no In addition, the aircraft is equipped with a device that recognizes other aircraft and obstacles in front of it with a radar device, but it accurately grasps the distance between it and itself,
There was no device or method to issue an alarm.

[0003]

As described above, as described above,
Since there is no way to know the accurate inter-vehicle distance between the host vehicle and the preceding vehicle, it was the driver's intuition to maintain the safe inter-vehicle distance that changes depending on the traveling speed of the host vehicle. For this reason, an insufficient inter-vehicle distance with respect to the traveling speed occurs due to the driver's familiarity and mental condition, which causes a rear-end collision accident or the like.

[0004]

The present invention takes the following means in order to solve the above problems.

That is, as a distance detecting device, a reflecting plate provided on the moving body of the object, a laser beam emitting means provided on the moving body for emitting a laser beam toward the reflecting plate ahead, and the above-mentioned moving body. The light receiving means is provided at a position distant from the position of the laser light emitting means and receives a part of the diffusely reflected laser light from the reflecting plate; An arithmetic unit that calculates the distance to the target moving body and an alarm device that receives the output of the arithmetic unit and issues an alarm when the distance is equal to or less than a predetermined value are provided.

[0006]

By the above means, the laser light is emitted from the laser light emitting means toward the reflecting plate of the target vehicle or flying object ahead. Part of the diffusely reflected light is received by the light receiving means, and its output is sent to the computing means. The calculation means obtains the angle between the emitted light and a part of the diffusely reflected light from the output of the light receiving means, and calculates and outputs the distance from the vehicle to the target vehicle or flying object ahead. The alarm receives the output of the computing means,
When the distance becomes less than a predetermined value, an alarm is issued.

In this way, the distance to the target vehicle or flying object can be easily measured, and when the distance becomes a predetermined value or less, it can be known by an alarm.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3.

In FIG. 1, a reflector 5 for a laser beam is attached to the rear part of the target vehicle 2. As shown in FIG. 2, the reflecting plate 5 has a reflecting surface having irregular irregularities for facilitating the diffuse reflection of the laser beam. Further, a laser light emitting device 3 of a laser light emitting means having an optical axis directed forward is provided on the left side of the front part of the vehicle 1. A laser light receiving device 4 of a laser light receiving means is further provided on the right side. The output of the laser light receiving device 4 is passed through a distance calculating device 8 with an alarm device of a calculating means,
It is sent to the inter-vehicle distance indicator 9 on the consol board 15.
In the figure, 16 is a speedometer.

In the above, the principle of calculating the inter-vehicle distance is shown in FIG.
Will be described with reference to. The emitted light 6 of the laser emitted from the laser beam emitting device 3 hits the reflection plate 5 of the laser beam and is diffusely reflected. A part of the reflected light 7 of the reflected laser diffused and reflected passes through the light receiving lens 10 in the laser light receiving device 4 and strikes the photodetector 11. If the light receiving angle at this time is α, this is the angle between the emitted light 6 and the reflected light 7. Therefore, the inter-vehicle distance L ₁ is given by the equation (1). L ₁ = L ₂ / tan α ... (1) where L ₂ is laser light emitting device 3 and laser light receiving device 4
It is the installation interval with.

The photodetector 11 has a function of converting the amount of movement of the light spot of the laser beam on the photodetector 11 into an electric signal as the vehicle-to-vehicle distance moves. This signal is input to the distance calculating device 8 with an alarm device, the moving amount of the light spot is angle-calculated, and the inter-vehicle distance is obtained from the equation (1). The output of the distance calculating device with alarm device 8 is sent to and displayed on the inter-vehicle distance indicator 9. Further, when the inter-vehicle distance L ₁ becomes equal to or less than a predetermined value set in advance, an alarm is issued by the alarm device. In addition, this function will automatically stop when the vehicle is running slowly (about 20 km / h) or less.

As described above, the inter-vehicle distance can be easily measured, and the alarm can be issued when the distance is less than the predetermined value.

Therefore, the safe inter-vehicle distance with respect to the traveling speed can be secured quantitatively by anyone from beginner to expert. This will prevent rear-end collisions due to insufficient vehicle-to-vehicle distance, etc., and ensure thorough driving knowledge to maintain a safe vehicle-to-vehicle distance.In automobiles, prevention of excessive speed and unsafe driving, such as forcible interruptions, etc. It is also effective in prevention.

By attaching a reflector plate to a dangerous place such as a steeply curved guardrail or a cliff, it is possible to prevent collision with these.

Further, in a railway vehicle or the like, it is possible to prevent the occurrence of a serious disaster such as a rear-end collision accident with a forward-stopped vehicle due to a failure or the like, and it is also effective in preventing an accident due to a failure of a signal or an automatic train stop device. There is.

The reflector 5a is provided on the fuselage of the target aircraft 22, which will be described with reference to FIG. Further, a laser light emitting device 3 having a laser light scanning device 12a is provided as a laser light emitting means at the front end of the right end of the main wing of the own aircraft 21. Further, a laser beam receiving device having a laser beam scanning device 12b is provided as a laser beam receiving means at the front left end. In the figure, 8 is a distance calculation device with an alarm device, and 9 is an inter-aircraft distance indicator.

As described above, when the target aircraft 22 does not fly in the same direction with respect to the own aircraft 21 as shown in the figure, the laser light emitting device 3 scans the target device 22 with the scanning device 12a. The emitted light 6 of the laser emitted toward the reflector 5a of the body hits the reflector 5a of the laser beam and is diffused and reflected. A part of the reflected light 7 of the laser diffused and reflected is scanned by the scanning device 12b and the laser light receiving device 4 is scanned.
Is received by.

The distance calculating device 8 with an alarm is a scanning device 12.
a, 12b, the laser light emitting device 3, and the laser light receiving device 4 are received, the angle α ₁ between the emitted light 6 and the reflected light 7 is obtained, and the distance L ₂ between the light emitting device 3 and the light receiving device 4 is obtained. To calculate and output the distance L _1a to the target aircraft 22. This output is sent to and displayed on the inter-aircraft distance indicator 9. Further, when the distance to the target aircraft 22 becomes less than or equal to a predetermined value, an alarm is issued by the alarm device.

In this way, the distance between the target aircraft 22 and the own aircraft 21 can be easily measured even when the aircraft are not flying in the same direction.

[0020]

As described above, according to the present invention, the distance to the target vehicle or flying object can be easily measured, and an alarm can be issued when the distance is below a predetermined value. Therefore, safe operation becomes possible.

[Brief description of drawings]

FIG. 1 is a configuration system diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a reflector of the present invention.

FIG. 3 is an explanatory view of the operation of the embodiment.

FIG. 4 is a structural system diagram of a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Own vehicle 2 Target vehicle ahead 3 Laser light emitting device 4 Laser light receiving device 5 Laser beam reflecting plate 6 Laser beam radiating light 7 Laser beam reflecting light 8 Distance calculating device 9 Distance measuring instrument 10 Light receiving lens 11 Light detection 12a, 12b Laser beam scanning device

Claims (1)

[Claims] 1. A reflector provided on a target moving body, a laser light emitting means provided on the moving body for emitting a laser beam toward the front reflector, and a laser light emitting means on the moving body. A light receiving means that is provided at a position apart from the position and receives a part of the diffusely reflected laser light from the reflecting plate,
An arithmetic means for receiving the output of the light receiving means and calculating the distance to the moving body of the object from the angles of the emitted light and the reflected light,
A distance detection device comprising an alarm device which receives an output of the calculation means and issues an alarm when the distance is equal to or less than a predetermined value.