JPH0515176Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a distance measuring system for displaying to the driver the distance between the rear end of the vehicle body and an obstacle behind the vehicle body, especially at night. This relates to a measuring device.

[Conventional technology]

When backing up a car, the visibility is narrow and the driving position when operating the steering wheel is difficult, and the visibility of the rear view is very different from the front view, so the rear end of the car body and obstacles at the rear of the car body are difficult to see. Reversing the car while visually measuring the distance to the other vehicle requires more skill than moving forward. In particular, it was extremely difficult to know the existence of obstacles, and it was also extremely dangerous.

For this reason, in recent years, ultrasonic detectors have been incorporated into the rear end of the car body, and this ultrasonic detector measures the distance from the rear end of the car to an obstacle located behind the car. Some devices display this to inform the driver of the distance from the rear end of the vehicle to the obstacle when the vehicle is reversing, thereby preventing the vehicle from coming into contact with obstacles located behind the vehicle.

Another method for measuring and displaying the distance from the rear end of a vehicle to an obstacle located behind the vehicle is to use a method installed at the rear end B of the vehicle A, as shown in Figure 5. A light beam is emitted from one light source 1 toward the rear of the vehicle body. When an obstacle C located behind the car A is irradiated with this light beam, the light area 2 reflected on the obstacle C is compared with the indicator 4 provided on the rear window 3 to determine whether the car A is Some devices display the distance from the rear end B of the vehicle body to the obstacle C to the driver. That is, when there is a sufficient distance from the rear end B of the vehicle A to the obstacle C, the light area 2 expands outward from the indicator 4, and the rear end of the vehicle A When the vehicle A approaches the obstacle C, the light area 2 overlaps the indicator 4, as shown in FIG. 5, to indicate that the rear end B of the vehicle A has approached the obstacle C.
Furthermore, by comparing the light area 2 and the index 4, it can be seen that the vehicle A
An example of a device that displays the distance from the rear end B to the obstacle C is a rear clearance notification device disclosed in Japanese Utility Model Application Publication No. 163147/1983.

[The problem that the idea attempts to solve]

As mentioned above, if you use an ultrasonic detector to measure the distance from the rear end of the car body to an obstacle located behind the car, you can measure the distance relatively accurately, but the cost of the entire device is high. I had a problem.

Furthermore, if the distance from the rear end B of the vehicle A to the obstacle C located behind the vehicle A is measured and displayed using the light region 2, the cost of the entire device can be kept low. However, there is no problem if the obstacle C located behind the car A is a planar object with a certain area or more, such as a wall surface, but if the obstacle C is a bar-shaped object or an object of low height. However, there was a problem in that the light area could not be accurately irradiated onto the obstacle C, and the distance could not be measured and displayed.

[Means to solve the problem]

The part of the lens of the cross clamp that is grounded at the rear end of the vehicle, which is installed in the center of the vehicle body, splits the light rays from the lamp built into the cross clamp into multiple light rays with different wavelength ranges, and then splits the light rays into multiple light rays with different wavelength ranges. A distance measuring lens section is provided to direct the light toward the ground diagonally behind the vehicle body.

[Effect]

As mentioned above, the light beam from the lamp inside the back clamp is split into multiple light beams with different wavelength ranges,
The separated light beams are irradiated toward the ground diagonally behind the vehicle body, and when the vehicle is backing up, each of the above-mentioned light beams is sequentially blocked by an obstacle, and visually confirms that the ground is no longer irradiated. This detects the distance from the rear end to an obstacle.

〔Example〕

Figures 1 to 3 show the rear end B of the vehicle A.
1 shows an automobile distance measuring device 11 according to the present invention, which is integrated into a pair of cross clamps 10 installed in a vehicle. In the figure, 12 is the housing of the cross clamp 10;
3 is a lamp serving as a light source, and 14 is a lens. 1
Reference numeral 5 denotes a distance measuring lens portion for configuring the automobile distance measuring device 11, which is integrally formed with a portion of the lens 14 located toward the center of the vehicle body. The distance measuring lens section 15 is formed into a prism shape, and the light rays irradiated from the lamp 13 are caused by the action of the distance measuring lens section 15, such as blue light 16a,
The yellow light beam 16b and the red light beam 16c are separated and irradiated toward the ground D located diagonally behind the vehicle body. Incidentally, the light beam irradiated from the automobile distance measuring device 11 of each cross clamp 10 is as follows:
As shown in Fig. 1, after crossing at the rear of the vehicle body, the ground D is irradiated, and the irradiation position of the rays on the ground D can be easily confirmed by the driver seated in the driver's seat. It is located in a position where it is possible.

In the above configuration, when the car A equipped with the automotive distance measuring device 11 according to the present invention is backing up, when the cross-clamp 10 lights up in conjunction with this backward movement, the distance-measuring lens provided on the lens 14 of the cross-clamp 10 lights up. Due to the action of the section 15, the ground D located diagonally behind the automobile A is illuminated by the blue light 16a, the yellow light ray 16b, and the red light ray 16c. When car A continues to move backwards in this state,
Behind the car A, for example, as shown in Figure 4,
When a bar-shaped obstacle C is located, as the rear end B of the vehicle A approaches the obstacle C, light beams 16a, 16b, 16c are emitted from the cross clamp 10.
are successively blocked by obstacles C. Then, three colored light rays 16a, 16 are irradiated onto the ground.
b, 16c, first the blue light ray 16a is blocked, then the yellow light ray 16b is blocked, and finally the red light ray 16c is blocked. Therefore, if the driver confirms that the three colored light beams 16a, 16b, and 16c irradiated to the ground disappear one after another, it is possible to confirm that there is an obstacle C behind the vehicle A and that there is a distance between the vehicle A and the obstacle. It can be easily confirmed that the distance to object C is gradually approaching.

In the above embodiment, the distance measuring lens section 15 is configured in a prism shape to separate the light beam from the lamp 13 into three colored light beams 16a, 16b, and 16c. By incorporating a color filter in the section 15, three colored light beams 16a, 16b,
16c may be irradiated. Moreover, it goes without saying that the colors of the light rays may be other than the three colors.

[Effect of idea]

As mentioned above, the present invention splits the light beam from the lamp inside the back clamp into multiple light beams with different wavelength ranges, and irradiates the divided light beams toward the ground diagonally behind the vehicle body, so that when the vehicle is backing up, obstacles can be detected. The distance from the rear end of the vehicle to the obstacle is detected by visually confirming that each of the above-mentioned light rays is gradually blocked by the rays and stops irradiating the ground. Therefore, if the vehicle distance measuring device according to the present invention is used, even if the obstacle located behind the vehicle is rod-shaped or low in height, it will be large enough to block the light beam from the back clamp. If there is, the position of the object can be detected, and the obstacle detection ability of an automobile distance measuring device of the type that emits a beam of light toward the rear of the automobile can be greatly improved. In addition, the present invention has a very simple structure in which the distance measuring lens part is integrated into the back clamp lens, so it is possible to install an automotive distance measuring device in a car without increasing the cost. It is possible to equip it.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a state in which a car is equipped with an automobile distance measuring device according to the present invention, Fig. 2 is a side view, and Fig. 3 is a plan cross-sectional view showing the main parts of the automobile distance measuring device. FIG. 4 is a plan view showing how the automotive distance measuring device is used, and FIG. 5 is a side view showing a conventional example of the automotive distance measuring device. 10...X clamp, 11...Automotive distance measuring device, 13...Lamp, 14...Lens, 1
5... Distance measurement lens part, B... Rear end of vehicle body,
16a...Blue ray, 16b...Yellow ray, 16
c... Red ray.

Claims (1)

[Scope of utility model registration request] The light beam from the lamp built into the cross clamp is split into multiple light beams with different wavelength ranges by the part of the lens of the cross clamp installed at the rear end of the car body, which is located toward the center of the car body. A distance measuring device for an automobile, characterized in that a distance measuring lens section is provided for emitting light toward the ground diagonally rearward of the vehicle body.