JPS5939196A - Ultrasonic wave transceiver - Google Patents

Abstract

PURPOSE:To make a car washing by a hose easy, by providing a projection with guard at the upper end of a reflecting plate in a sound wave irradiating outlet of an ultrasonic wave oscillator of an ultrasonic wave transceiver for a car so as water risen along the reflecting plate descends with the projection. CONSTITUTION:A bracket 5 is fitted to the inside of a bumper 6 of a car and a parabola reflecting mirror 1 giving a prescribed directivity to an ultrasonic wave and a rubber-made arm 4 fitted with an ultrasonic wave oscillator 3 are fixed to the bracket 5. Further, an ultrasonic wave guide 2 is provided between the opening of the bumper 6 and that of the reflecting mirror 1, and parabola air gaps 7a, 7b are provided between the reflecting mirror 1 and the guide 2 with a prescribed interval. A projection 4a with a guard is provided at the upper end of the reflecting mirror 1 in the ultrasonic wave irradiating outlet of the oscillator 3 is provided. In washing the car with the hose or the like, the water risen along the reflecting mirror 1 is fallen down at the brimmed projection 4a so as to prevent detouring water from striking the oscillator 3.

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.

Conventionally, as a device of this kind, there is a device in which an ultrasonic transducer and a horn are attached to the bumper at the rear of the vehicle to send and receive C ultrasonic waves to the rear of the vehicle. This device requires bones in order to obtain directivity in a predetermined direction, and for this purpose a certain degree of size and depth are required.

In contrast, a reflection type ultrasonic transducer with a reduced 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 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 wider aperture area for transmitting and receiving ultrasonic waves.

However, when washing a car with such an ultrasonic transducer using a Bose etc., water rises upward along the reflection plate, and the water wraps around from above and hits the ultrasonic vibrator. , a problem arises in that the function of the ultrasonic transducer deteriorates.

The present invention provides the above-mentioned reflection type ultrasonic transducer with an ultrasonic radiation opening of an ultrasonic transducer that is located above the reflection plate.
, -m The above-mentioned problem is solved by providing a flange-like protrusion on the portion.

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

FIG. 1 is a cross-sectional view of the ultrasonic transducer according to the present invention installed in the rear bumper of a vehicle. In FIG. 1, l is a parabolic reflector serving as a reflector for giving specific directivity to the transmission and reception of ultrasonic waves, and 2 is a parabolic reflector that is connected to the opening L1 of the bumper 6 at the rear of the vehicle. The ultrasonic guide 3 connects the open end of the reflector 1 with a tapered tube, and the ultrasonic guide 3 emits ultrasonic waves to the parabolic reflector 1 and receives the ultrasonic waves reflected at the parabolic reflector 111 ( 3a is a net provided on the front surface of the ultrasonic transducer (indicated by a solid arrow), 4 is an ultrasonic transducer 3
5 is a rubber arm that holds the parabolic reflector 1 at a focal point relative to the paraboloid of the parabolic reflector 1 and has a collar-like protrusion 4a facing the parabolic reflector 1; 5 indicates the parabolic reflector 1 and the arm; 6 is a bumper made of urethane or metal; 7a is a bumper made of urethane or metal;
, 7j+ is a parabolic reflection I! ■ Maintain a constant distance between the left and right ends and the lower part of the ultrasonic guide 2 -C
This is a parabolic cavity provided.

FIG. 2 is a view taken from arrow 11 in FIG. 1, and is a portion surrounded by the upper curved surface portion 1a of the parabolic reflector 411, the central curved surface portion 4b of the arm 4, and the arm portion of the arm 3 divided into two. A curved cavity 8 is formed in the. Although not shown, the lead wire of the ultrasonic transducer 3 passes through one of the two arm portions of the arm 3 and is connected to the ζ-shaped portion VCW'4.

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

When an electric signal is applied to the ultrasonic n'/IJL transducer 3 of the ultrasonic transducer with the above structure, the ultrasonic transducer 3
ζ Ultrasonic waves are emitted, which are reflected by the parabolic reflector 1 and sent to the rear of the vehicle as indicated by the arrow in FIG. In addition, the ultrasonic wave that is reflected by an obstacle behind the vehicle is reflected by the parabolic reflector l from the ultrasonic guide 2 and is collected by the parabolic reflector l, and reaches the ultrasonic transducer 3'ζ. 'l and transmitted to the external device.

Therefore, in this embodiment, when washing a vehicle by spraying water on it using a hose or the like, the water flowing in from the bumper opening of the ultrasonic guide 2 shown in FIG. 1 flows in a direction toward the dotted line (not shown in FIG. The light is transmitted through the surface of the parabolic reflecting mirror 1, and is discharged in the direction of the dotted line 'ζ' through the gap 8 formed above. Also,
The water that is not discharged in the direction of dotted line B but goes around in the direction of dotted line C goes around onto the collar-shaped projection 4a provided at the tip of the Arno-4 and falls. In addition, for directions other than the above B and C directions, E
.

Water in the F direction, that is, water in the horizontal and downward directions of the parabolic reflector L, is a parabolic reflection! It is discharged to the outside through parabolic voids 7a and 7b provided at both ends and below of Jl. Therefore, the water that has flowed in through the opening of the ultrasonic guide 2 is discharged to the outside from each gap, so that water can be prevented from flowing into the ultrasonic transducer 3.

Note that the same effect can be obtained by mounting the ultrasonic transducer described in the above embodiment on the exterior of the vehicle, such as the upper part of the bumper or the F section, without using an ultrasonic guide.

As described above, in the present invention, for a reflection-type ultrasonic transducer, the flange-like protrusion is provided at the end of the ultrasonic wave emitting port of the ultrasonic transducer facing the reflection plate. Water from above that rises along the plate falls along the brim-like protrusion, which prevents the water from coming in from above and hitting the ultrasonic transducer5, thereby preventing functional deterioration of the ultrasonic transducer. It has the excellent effect of being able to

[Brief explanation of the drawing]

1 is a cross-sectional view showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line 1 in FIG. 1, and FIG. 3 is a sectional view taken along the line 111--2 in FIG. 1... Parabolic reflector, 3... Ultrasonic transducer, 4...
- Arm, 4a... collar-shaped projection, 6... bumper. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] An ultrasonic transducer comprising an ultrasonic transducer and a reflector disposed behind the ultrasonic transducer to reflect ultrasonic waves, the ultrasonic transducer including an ultrasonic wave emitting port of the ultrasonic vibrator a7- above the reflector. An ultrasonic transducer characterized by having a flange-like projection on the facing end.