JPS5939194A - Ultrasonic wave transceiver - Google Patents

Abstract

PURPOSE:To attain ease of a car washing, by holding fixedly an ultrasonic wave oscillator to the prescribed position of a reflecting plate for ultrasonic wave transmission/receiving for a car and providing an arm having a cross section of an inverse triangle shape at the upper part of the reflecting plate so as to flow distributively water going upward along the reflecting plate. CONSTITUTION:The ultrasonic wave oscillator 2 is fixed to the rubber-made arm 3 of an inverse triangle shape and mounted in the bumper of a car, and the arm 3 is fitted with a parabola reflecting mirror 1 giving the directivity to the ultrasonic wave transmission and receiving. The cross section of the arm 3 fitted to the upper surface of the reflecting mirror 1 is taken as the inverse triangle shape, and the water invaded from the opening of the bumper via an ultrasonic guide is elevated in the direction A along the parabola plane of the reflecting mirror 1 and distributed into directions B, C with the arm 3 of the inverse triangle shape. Then, the water washing the car with a hose is flowed out so as to prevent the water from flowing into the inside of the oscillator 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic transducer that is mounted on a vehicle and transmits and receives ultrasonic waves to detect nearby obstacles or communicate between vehicles. It is.

Conventionally, this type of device was installed inside the bumper at the rear of the vehicle.
Some devices are equipped with an ultrasonic transducer and a horn to send and receive ultrasonic waves to the rear of the vehicle. This device requires a horn to obtain directivity in a predetermined direction.
For this purpose, a certain amount of depth is required.

In contrast, a reflection-type ultrasonic transducer with a smaller depth can be considered. This reflection type ultrasonic transducer includes an ultrasonic transducer that transmits and receives ultrasonic waves, and a reflector that gives directivity to the transmitted ultrasonic waves and collects the ultrasonic waves for reception.

This device has advantages over the conventional ultrasonic transducer described above in that it has fewer side lobes and can have a larger aperture area for transmitting and receiving ultrasonic waves.

However, when such an ultrasonic transducer is washed using a wash machine, water rises upward along the reflector, and a large amount of water falls onto the ultrasonic transducer. This causes a problem in that the ultrasonic transducer's function deteriorates.

The present invention fixes and holds an ultrasonic transducer at a predetermined position with respect to a reflection plate for the above-mentioned reflection type ultrasonic transducer, and also directs water in two directions along the reflection plate. The above-mentioned problem is solved by providing an arm having an inverted triangular cross-sectional shape that divides the flow into the reflector on the side of the reflector.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a sectional view showing a first embodiment of the present invention, and FIG. 2 is a sectional view of a main part taken along the line II-I+ in FIG. This figure 1,
In Fig. 2, 1 is a parabolic reflector that serves as a reflection to give specific directivity to the transmission and reception of ultrasonic waves, 2 is a parabolic reflector that emits ultrasonic waves to a parabolic reflection IN l, and an ultrasonic transducer that receives the ultrasonic waves reflected by the parabolic reflector l (indicated by a solid arrow 1); 2a is a net provided in front of the transducer; 3;
is a rubber armoire with an inverted triangular cross section that holds the ultrasonic transducer 2 at a predetermined focal length. Although the Lie IJ line of the ultrasonic transducer 2 is not shown in the diagram, the arm 3
It penetrates through the inside of 'C' and is connected to an external device.

In addition, the ultrasonic transducer with the above structure is installed inside the bumper at the rear of the vehicle, and is transmitted through an ultrasonic kite (shown in the figure) connected to the open 1-1 surface of the parabolic reflector. It is open to the outside of the vehicle through an opening in the bumper.

In the above configuration, when an electric signal is applied to the ultrasonic transducer 2, an ultrasonic wave is emitted by the ultrasonic transducer 2, and this ultrasonic wave is reflected by the parabolic reflection tJ11, and the ultrasonic wave is It is sent to the rear of the vehicle via the kite. Also,
Ultrasonic waves reflected from obstacles behind the vehicle are collected by parabolic reflection IQ I-C from the ultrasonic wave guide, reach the ultrasonic transducer 2, are converted into electrical signals, and are transmitted to an external device.

In this embodiment, when washing the vehicle by spraying water on the vehicle using a water sprayer or the like, water flows into the opening 2 of the bumper through the ultrasonic guide (a in Fig. 1). along the paraboloid of the parabolic reflector l, -(, l17Y, (m2 Figure A
) L, inverted triangular shape, 34. More B
, is shunted in the C direction and flows into the bumper: j+tlcC to the outside. With this structure, it is possible to prevent water from flowing into the ultrasonic transducer 2.

Next, a second embodiment of the present invention will be explained.

FIG. 3 is a sectional view thereof, and FIG. 4 is a sectional view of a main part taken along the line IV-IV in FIG. 3. In FIGS. 3 and 4, the arm 3' is composed of a zelkova that holds the ultrasonic transducer 2 at a predetermined focal distance with respect to the parabolic reflector 1, and a base having an inverted triangular cross-section. be done. With this structure, the earthy water flowing along the parabolic reflector l is divided into two directions at the inverted triangular part of the arm 3', which is different from the above-mentioned embodiment 1. It is possible to obtain the same waterproof effect.

As described above, in the present invention, in a reflection-type ultrasonic transducer, the ultrasonic transducer is fixedly held at a predetermined position with respect to the reflection plate, and the ultrasonic transducer is raised along the reflection plate. An arm having an inverted triangular cross-sectional shape that divides the water into two directions is provided in the F direction of the reflector, so that the water rises along the reflector and hits the ultrasonic transducer. This has the excellent effect of preventing deterioration of the function of the ultrasonic transducer.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Fig. 2 is a sectional view of the main part taken along arrows - - in Fig. 1, and Fig. 3 is a sectional view showing the second embodiment of the present invention. FIG. 4 is a cross-sectional view of a main part taken along the line rV-IV in FIG. 3. ■... Parabolic reflector, 2... Ultrasonic transducer, 3...
·arm. Representative Patent Attorney Takashi Okabe 1 Figure 3 Figure 4

Claims (1)

[Claims] An ultrasonic transducer comprising an ultrasonic transducer and a reflecting plate disposed behind the ultrasonic transducer to reflect ultrasonic waves, the ultrasonic transducer being fixedly held at a predetermined position with respect to the reflecting plate. Also, an ultrasonic transducer characterized in that an arc having an inverted triangular cross-sectional shape that divides water rising along the reflecting plate into two directions is provided above the reflecting plate.