JPS5939193A - Ultrasonic wave transceiver - Google Patents

Abstract

PURPOSE:To exclude effectively water at car washing, by mounting an ultrasonic wave oscillator and a reflecting plate at the inside of a bumper for car, and providing an ultrasonic wave guide between a transmission/receiving opening of a prescribed part of the bumper and the reflecting plate so as to provide drain holes having a prescribed interval between the guide and the relfecting plate. CONSTITUTION:The ultrasconic wave oscillator 3 is mounted in a bumper 6 at the back of a car with a rubber-made arm 4, and a parabola reflecting mirror giving a specific directivity to an ultrasonic wave is mounted at the rear part. Further, the ultrasonic wave guide 2 is provided between the openings of the bumper 6 and the reflecting mirror 1. Then, parabola air gaps 7a, 7b with a prescribed interval are provided among both left/right ends, the downward part of the reflecting mirror 1 and the guide 2. The air gaps 7a, 7b are used as drain holes, and it is prevented that much water is jetted to the oscillator 3 with car washing using a hose or the like and the degradation of the function of the oscillator 3 is avoided.

Description

[Detailed Description of the Invention] The present invention can be mounted on the front or rear bumper of a vehicle.
The present invention relates to an ultrasonic transducer that detects nearby obstacles by transmitting and receiving ζ ultrasonic waves, or performs 3i11 communication between vehicles.

Conventionally, there is a device of this type in which an ultrasonic transducer and a horn are installed in the bumper at the rear of the C1 vehicle to send and receive ultrasonic waves to both rear sides of the vehicle. This device requires a horn to obtain directivity in a predetermined direction, and for this purpose Ai! +f't! The depth of the degree is the evening and the key point.

On the other hand, a reflection-type ultrasonic transducer with a smaller depth (5-shi) can be considered. It consists of an ultrasonic transducer and a reflector that gives directivity to the transmitted ultrasonic waves and collects the received ultrasonic waves.

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 with a hose or the like, water rises upward or to the left and right along the reflector, causing a large amount of water to reach the ultrasonic transducer. The problem arises that the function of the ultrasonic transducer deteriorates.

The present invention is applied to the above-mentioned reflection-type ultrasonic transducer, and an ultrasonic guide is provided between the bumper opening and the reflecting plate, and water is provided at a predetermined interval between the ultrasonic guide and the reflecting plate. This is intended to solve the second problem by providing a void for extraction.

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

Figure 1 is a cross-sectional view of the ultrasonic transducer according to the present invention installed in the bumper at the rear of the vehicle (=J). 2 is an ultrasonic guide that connects the opening of the bumper 6 at the rear of the vehicle and the end of the opening of the parabolic reflector 1 with a tapered tube; 3 is an ultrasonic transducer that emits ultrasonic waves to the parabolic reflector 1 and receives the ultrasonic waves reflected by the parabolic reflector 11 (indicated by a solid arrow 1); 3a is provided in front of the ultrasonic transducer; The mesh 4 is a rubber armature that holds the #5 sound wave oscillator 3 at a focal position with respect to the paraboloid of the parabolic reflector 1, and has a collar-like protrusion 4a facing the parabolic reflector 1.・, 5 is a bracket for fixing the parabolic reflection 11■ and the arm 3 and mounting them inside the bumper 6, 6 is a bumper made of urethane or metal, 7 a, 7 bl; J parabolic reflection &-Q This is a parabolic gap provided between both ends and the lower part of the I in the left and right direction and the ultrasound guide 2 with a constant interval.

FIG. 2 is a view taken in the direction of the arrow ■ in FIG. A curved cavity 8 is formed. Although not shown, the lead wire of the ultrasonic transducer 3 passes through one of the two arms of the arm 3 and is connected to an external device.

FIG. 3 is a sectional view taken along the line ■-■ in FIG. 1.

When an electric signal is applied to the ultrasonic transducer 3 of the ultrasonic transducer with the above structure, an ultrasonic wave is emitted by the ultrasonic vibration r3, and this ultrasonic wave is reflected by the parabolic reflector ■. It is sent to the rear of the vehicle as shown by the arrow in FIG. In addition, ultrasonic waves that are deflected by obstacles behind the vehicle are reflected and collected from the ultrasonic kite 2 by the parabolic reflector 1, reach the ultrasonic transducer 3, are converted into electrical signals, and are transmitted to an external device. be done.

In this embodiment, when the vehicle is washed by spraying water with a hose or the like, the water flowing from the bumper opening Li of the ultrasonic wave 1'2 in FIG. 1 flows into the dotted line shown in FIG. The parabolic reflection s)i is transmitted from the direction of the surface of i, and is emitted in the direction of dotted line B through the void formed above it. The water wraps around in the direction of , and falls onto the flange-shaped projection 4a provided at the tip of the 'y-mu 4.Also, in the above-mentioned B and C
Glue other than direction, E.

Water in the F direction, that is, the left and right direction of the parabolic reflection iQ l,
The water in the downward direction is discharged to the outside through parabolic cotton-like voids 7a and 7b provided at both ends and below the parabolic reflecting mirror l. Therefore, the water that has flowed into the opening of the ultrasonic gad 2 from the first part is discharged to the outside from each gap, so that the ultrasonic vibrator 3
can prevent water from entering.

Next, second and third embodiments of the present invention shown in FIGS. 4 and 5 (sectional views in the same direction as FIG. 3) will be described. In FIG. 4, the ultrasonic guide 2' provided between the parabolic reflector 1 and the bumper opening has a structure in which the three sides forming the gaps 7a, 7b are bent outward. ing. In FIG. 5, the C1 parabolic reflector 1' has a shape in which the portions forming gaps 7a and 7b are rounded to an extent that does not impair the directivity for transmission and reception of ultrasonic waves. This figure 4,
By creating a structure as shown in FIG.
In addition to obtaining the same waterproof effect as in the l embodiment, −j t
tl lJj water direction can be set.

As described above, in the present invention, an ultrasonic guide is provided between the bumper opening and the reflection plate for a reflection type +114 sound wave transducer, and an ultrasonic guide is provided between the ultrasonic guide and the front station reflection plate. Since water drainage gaps are provided at predetermined intervals, water that has flowed in through the reflector is discharged to the outside, preventing water from hitting the ultrasonic transducer, thereby reducing the functionality of the ultrasonic transducer. It has the excellent effect of preventing

[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 taken along the I+ arrow in FIG. FIG. 5 is a sectional view showing the second and third embodiments of the present invention. ■... Parabolic reflector, 2... Ultrasonic guide, 3...
・Ultrasonic transducer, 6...bumper. Representative Patent Attorney Takashi Okabe 1 Meat Figure 2 Figure 3 Figure 4 Figure 2'

Claims (1)

[Claims] An ultrasonic transducer and a reflector disposed on one side of the transducer to reflect ultrasonic waves are installed inside a vehicle bumper, and an opening for transmitting and receiving ultrasonic waves provided in a predetermined part of the bumper and the reflecting plate are arranged on one side of the ultrasonic transducer to reflect ultrasonic waves. An ultrasonic transducer characterized in that an ultrasonic guide is provided between the ultrasonic guide and the reflecting plate, and a water drainage gap is provided at a predetermined interval between the ultrasonic guide and the reflecting plate.