JPH0321494Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an ultrasonic sensor that is incorporated into an automobile bumper or the like.

Conventional technology In recent years, ultrasonic detectors have been incorporated into the rear of automobiles.
This ultrasonic detector measures the distance from the rear end of the car to an obstacle located behind the car.
By displaying this measurement result inside the vehicle, the driver is informed of the distance from the rear end of the vehicle to the obstacle when the vehicle is backing up, thereby preventing the vehicle from coming into contact with obstacles located behind the vehicle. There is something.

The ultrasonic detector used for the above purpose, as shown in FIG. A control unit D measures the distance to an obstacle by measuring the time it takes for the ultrasonic waves emitted from B to reflect off an obstacle located at the rear of the vehicle and return to the ultrasonic receiver C. and a display E for displaying the measurement results to the driver inside the vehicle. The ultrasonic sensor used as the ultrasonic transmitter B and the ultrasonic receiver C includes a sensor body consisting of an ultrasonic microphone, a casing that houses the sensor body, and a sensor body that is supported by the casing. It is configured with an acoustic horn placed in front of the sensor body to provide directivity to the sensor body. The ultrasonic sensor is used as an ultrasonic transmitter or an ultrasonic receiver by using an ultrasonic microphone constituting the sensor body as an ultrasonic transmitter or receiver. In addition, as the above-mentioned ultrasonic sensor, for example,
There is an ultrasonic transducer and the like disclosed in Publication No. 39196.

Problems to be Solved by the Invention Conventionally, an ultrasonic sensor used as an ultrasonic transmitter or receiver of an ultrasonic detector is installed in the rear side of an automobile, such as a rear bumper, as follows. There is. That is, a hole with approximately the same diameter as the opening of the acoustic horn of the ultrasonic sensor is made in the bumper, and the ultrasonic sensor is positioned within the bumper so that this hole and the opening of the acoustic horn match. The ultrasonic sensor is fixed to the bumper using a bracket or the like. Also, on the outer periphery of the hole made in the bumper,
A decorative gap is attached to improve the appearance. However, when the ultrasonic sensor is assembled into the bumper using a bracket and the cap is attached to the outer periphery of the hole provided in the bumper, there is a problem that the work of assembling the ultrasonic sensor into the bumper becomes complicated. .

Means for Solving the Problems: A sensor body serving as an ultrasonic transmitter or an ultrasonic receiver, a bottomed cylindrical casing with an open end that houses the sensor body, and a casing in front of the sensor body. In an ultrasonic sensor comprising an acoustic horn whose rear end fits into the opening of the casing, a flange is formed on the outer periphery of the opening of the casing, and on the outer periphery of the tip of the acoustic horn, The ultrasonic sensor is mounted on a bumper or the like that serves as a support member for the ultrasonic sensor by forming a flange portion that faces the flange portion provided on the casing and using the flange portion of the casing and the flange portion of the ultrasonic sensor. It is designed to hold the outer periphery of the hole for use.

Function: The flange part provided on the casing of the ultrasonic fracture sensor and the flange part provided on the acoustic horn position the ultrasonic sensor sensor by pinching the outer periphery of the hole for installing the ultrasonic sensor provided on the bumper, etc. It is used for fixing.

Embodiment FIGS. 1 and 2 show a first embodiment of an ultrasonic sensor according to the present invention. A casing 2 having an open and bottomed cylindrical shape for housing the sensor body 1.
and an acoustic horn 3 placed in front of the casing 2.
It is structured according to the following. As shown, a flange portion 2a is provided on the outer periphery of the opening of the casing 2, and a threaded portion 2b is provided on the inner periphery of the opening. Further, the rear outer peripheral surface of the acoustic horn 3 is provided with a threaded portion 3b that is screwed into the threaded portion 2b, and the outer periphery of the tip portion is provided with a flange portion 3a that faces the flange portion 2a of the casing 2. Also, 4 in the diagram
is a spacer for positioning and fixing the sensor main body 1 within the casing 2.

In order to attach the ultrasonic sensor having the above configuration to, for example, a bumper A on the rear side of an automobile, a hole A' having a diameter slightly larger than the outer diameter of the acoustic horn 3 is provided in the bumper A, as shown in FIG. Next, the casing 2 containing the sensor body 1 is placed inside the bumper A,
After aligning the opening of casing 2 with hole A',
Insert into the rear part of the acoustic horn 3 into the hole A' from the surface side of the bumper A. Then, the threaded portion 3b provided at the rear of the acoustic horn 3 is screwed into the threaded portion 2b provided on the inner peripheral surface of the opening of the casing 2, and at the same time, the flange portions 3a, 2b provided on both are screwed together.
The ultrasonic sensor is fixed to the bumper by clamping the outer periphery of the hole A with the screws.

FIG. 3 shows a second embodiment of the ultrasonic sensor according to the present invention. As shown in FIG.
The first and second spacers 4a and 4b are made of an elastic body such as rubber, and the other parts are the same as the first embodiment. The sensor body 1 is connected to the casing 2 by the first and second spacers 4a and 4b.
By elastically supporting the ultrasonic sensor in the sensor body 1, the resonant frequency components generated by vibrations of the automobile are prevented from being directly transmitted to the sensor body 1, thereby preventing malfunction of the ultrasonic sensor.

4 and 5 show a third embodiment of the ultrasonic sensor according to the present invention, and the ultrasonic sensor shown in this figure has a casing 2 and an acoustic horn 3 not screwed together but screwed 5 and are integrally connected. That is, the flange portion 3a of the acoustic horn 3
A convex portion 3d having a screw hole 3c is provided, and
The screw hole 3c is provided in the flange portion 2a of the casing 2.
A hole 2c is provided that coincides with the hole 2c. Then, the protrusion 3d is inserted into the small hole A'' provided around the hole A' of the bumper A, and the screw hole 3c provided in the protrusion 3d and the hole 2c provided in the flange portion 2a of the casing 2 are inserted. By screwing the screw 5 into the screw hole 3c from the hole 2c, the casing 2 and the acoustic horn 3 are integrated, and at the same time, the flange parts 2a and 3a are connected to the hole A'. Hold the outer periphery of the
The ultrasonic sensor is fixed to the bumper A.
This embodiment is also the same as the first embodiment except for the parts mentioned above.

Effects of the Invention As described above, in the ultrasonic sensor according to the present invention, the outer periphery of the ultrasonic sensor mounting hole provided in a bumper etc. is held between the flange portion provided on the casing and the flange portion provided on the acoustic horn. By this,
Since the ultrasonic sensor is positioned and fixed, it becomes very easy to attach the ultrasonic sensor to a bumper or the like. Furthermore, since the flange portion of the acoustic horn is exposed on the surface of the bumper, etc., if the shape of the flange portion is taken into account, there is no need to attach a decorative cap to the outer periphery of the ultrasonic sensor mounting hole provided in the bumper, etc. Furthermore, when installing an ultrasonic sensor on a car, the present invention allows you to change the directivity of the sensor to suit each car type by changing only the acoustic horn for each car type. Since the sensor body and casing can be shared, costs can be reduced when installing the ultrasonic sensor in multiple car models.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a first embodiment of the ultrasonic sensor according to the present invention, FIG. 2 is a front view, FIG. 3 is a side sectional view showing the second embodiment, and FIG. 3
FIG. 5 is a side sectional view showing the embodiment, and FIG. 5 is a front view. FIG. 6 is a perspective view showing how the ultrasonic sensor is attached to an automobile. 1...Sensor body, 2...Casing, 2a...
...Flange part, 3...Acoustic horn, 3a...Flange part.

Claims (1)

[Scope of utility model registration request] A sensor body serving as an ultrasonic transmitter or an ultrasonic receiver; a bottomed cylindrical casing with an open end that houses the sensor body; In an ultrasonic sensor consisting of an acoustic horn that fits into an opening of a casing, a flange is formed on the outer periphery of the opening of the casing, and a flange is formed on the outer periphery of the tip of the acoustic horn.
The ultrasonic sensor is mounted on a bumper or the like that serves as a support member for the ultrasonic sensor by forming a flange portion facing the flange portion provided on the casing and using the flange portion of the casing and the flange portion of the ultrasonic sensor. An ultrasonic sensor characterized in that the outer periphery of a hole is clamped.