JPH0575690U - Ultrasonic distance sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] To be mounted horizontally on a vertical surface and to be miniaturized. [Structure] Transducer 10 for transmitting and receiving ultrasonic waves
And a rubber holder 11 for supporting the transducer 10.
The support plate 1 includes a sensor holder 12 that supports the rubber holder 11, a support plate 13 that supports the sensor holder, and a rubber cover 14 that is attached to the support plate 13 and the surroundings.
An adhesive member 27 is fixed to the surface of No. 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ultrasonic distance sensor, and particularly to an ultrasonic distance sensor effectively used for detecting a distance to an object to be measured using ultrasonic waves.

[0002]

[Prior Art]

 As an ultrasonic distance sensor, for example, it is attached to the bumper of a car to measure the distance between the car and an obstacle, and to issue an alarm when the distance between the car and the obstacle falls within the set range. Some are configured.

[0003]

[Problems to be solved by the device]

 However, the conventional ultrasonic distance sensor that is attached to the bumper of an automobile is configured so that it is attached to the horizontal surface of the bumper of an automobile, so that the sensor body is integrally formed on the upper side of the fixed part. The shape becomes large.

Moreover, since it can be mounted only on a horizontal surface, the mounting place is limited.

Further, since the sensor holder for supporting the transducer in the conventional ultrasonic distance sensor is provided with the annular projecting portion for giving directivity around the transducer, a space between the projecting portion and the transducer is provided. Rainwater may collect in the space. If water accumulates around the transducer in this way, the ultrasonic distance sensor may malfunction.

An object of the present invention is to provide an ultrasonic distance sensor which can be mounted on a vertical surface and can be miniaturized.

Another object of the present invention is to provide an ultrasonic distance sensor capable of preventing rainwater and the like from accumulating around the transducer.

[0008]

[Means for Solving the Problems]

 The ultrasonic distance sensor according to the present invention is an ultrasonic distance sensor that detects the distance to an object to be measured by transmitting and receiving ultrasonic waves, and includes a transducer that is formed in a substantially cylindrical shape and that transmits and receives ultrasonic waves. A substantially cylindrical elastic holder that supports the transducer while avoiding the ultrasonic transmission path, a sensor holder that is formed in a substantially annular shape and has an elastic holder housed in a recess formed in the center, and a substantially flat plate shape. A support plate for supporting the sensor holder and an annular elastic cover arranged around the support plate, and an adhesive member is fixed to the surface of the support plate opposite to the sensor holder support surface. It is characterized by

[0009]

[Action]

 According to the above-mentioned means, the sensor holder is fixed to the flat support plate, and the transducer is fixed to the sensor holder via the elastic holder. That is, the mounting portion and the sensor body are integrated, and by attaching an adhesive member to the support plate, the mounting portion can be mounted on a vertical surface in the rear trunk of an automobile. Moreover, since the mounting portion and the sensor body are integrated, the size can be reduced.

[0010]

【Example】

 1 (a) and 1 (b) are side sectional views and plan sectional views showing an ultrasonic distance sensor according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are front views showing the ultrasonic distance sensor. 1 and 2 are cross-sectional views taken along the line II-II of FIG. 1, and FIGS. 3A, 3B, 3C, and 3D are front views, side sectional views, rear views, and plan sectional views showing the sensor holder. FIGS. 4 (a), 4 (b), 4 (c) and 4 (d) are a front view showing a rubber holder, a partially cut side view, a rear view and a plan sectional view, FIGS. 5 (a), 5 (b) and 5 (). 6C and 6D are a front view showing a support plate, a side sectional view, a rear view and a plan sectional view, and FIGS. 6A and 6B are a front view and a partially cut plan view showing a rubber cover. ..

In the present embodiment, the ultrasonic distance sensor according to the present invention is attached to a vertical surface of a rear trunk of an automobile, and is configured to detect a distance to an object to be measured using ultrasonic waves.

That is, this ultrasonic distance sensor is provided with a transducer 10 which is formed in a substantially cylindrical shape and transmits and receives ultrasonic waves, and the transducer 10 is fixedly supported by a sensor holder 12 via a rubber holder 11. ing. The sensor holder 12 is fixed to a support plate 13, and a rubber cover 14 is attached around the support plate 13.

The transducer 10 is provided with a columnar main body 16 having a truncated cone shape at the front end, and a transmitter / receiver 15 is integrally formed on the front end of the transducer 10 to transmit ultrasonic waves from the transmitter / receiver 15. The ultrasonic wave reflected from the object to be measured is received by the transmitting / receiving unit 15 while being transmitted.

The body 10 of the transducer 10 is fitted in a rubber holder (elastic holder) 11 formed in a substantially tubular shape. A pair of terminals 17 and 18 are projected on the bottom surface of the main body portion 16, and terminals of a cable 19 are connected to the terminals 17 and 18, respectively. This cable 19 is connected to a preamplifier of a controller (not shown) installed in the trunk of the automobile or in the passenger compartment.

The sensor holder 12 is formed into a three-dimensional shape having a substantially elliptical shape in a front view and a substantially trapezoidal shape in a plan view, and a rubber holder fixing concave portion 20 is formed in a central portion thereof. The rubber holder 11 is housed in the recess 20. A pair of fixing holes 21, 21 are formed in the vicinity of the recess 20 in the sensor holder 12, and a cable insertion hole 22 is formed in the side wall of the sensor holder 20.

On the front surface of the sensor holder 12, a projecting portion 23 for giving directivity to ultrasonic waves is integrally formed so as to be arranged around the transducer 10 supported in the fixing recess 20 and project forward. Has been done. In this embodiment, the projecting portion 23 is provided so as to cover only the upper portion and the lower portion of the transducer 10, and the left and right sides thereof are open.

The support plate 13 is formed in a substantially elliptical flat plate shape, and a pair of insertion holes 24, 24 are opened on the major axis. A plurality of protrusions 25 are provided on the main surface on the front side of the support plate 13.

The support plate 13 is mounted on the back surface side of the sensor holder 12, supports the bottom surface side of the gum holder 11 by the protrusion 25, and is fixed to the sensor holder 12 by the screw 26 inserted into the insertion hole 24. Is configured.

On the outer peripheral side of the support plate 13, a rubber cover 14 integrally formed in an elliptical ring shape is mounted. The rubber cover 14 is configured to create a sense of unity when the ultrasonic distance sensor is attached to a vehicle.

Next, the work of attaching the ultrasonic distance sensor to the automobile will be described.

An adhesive member 27 such as a double-sided tape is previously attached to the back surface of the support plate 13 in the ultrasonic distance sensor. The ultrasonic distance sensor to which the adhesive material 27 is adhered is arranged rearward at an appropriate position on the rear surface of the rear trunk of the automobile, and the support plate 13 is brought into contact with the rear surface wall and adhered by the adhesive member 27.

On the other hand, as described above, the controller to which the transducer 10 is connected is installed inside the rear trunk or inside the vehicle compartment.

Then, while the vehicle is moving backward, ultrasonic waves are transmitted from the transducer 10 in response to a command from the controller. When this ultrasonic wave is reflected by the object to be measured such as the wall surface of the garage, the ultrasonic wave reflected is received by the transducer 10, and the received signal is input to the controller via the cable 19.

At this time, since the ultrasonic waves are given directivity by the projecting portion 23 projectingly provided on the front surface of the sensor holder 12, the ultrasonic waves reach relatively far and are received without spreading noise.

The controller calculates the distance between the automobile and the object to be measured, and when the calculated value reaches the set value, an alarm is issued.

According to the present embodiment, since the transducer 10 is configured to be attached to the support plate 13 via the rubber holder 11 and the sensor holder 12, the sensor main body portion and the attachment portion are integrated and miniaturized. Can be planned.

By mounting the adhesive member 27 on the support plate 13, the sensor can be mounted horizontally on a vertical surface, so that the mounting location is restricted more than the conventional ultrasonic distance sensor. You can

Further, since the protrusion 23 is formed on the sensor holder 12 so as to cover only the upper portion and the lower portion of the transducer 10, rainwater and the like are prevented from collecting around the transducer 10. Therefore, the transducer 10 is prevented from malfunctioning due to the accumulation of water.

[0029]

[Effect of the device]

 As described above, according to the present invention, since the back surface of the sensor is configured to be adhered to the vertical surface of the vehicle, the ultrasonic distance sensor can be miniaturized and the horizontal direction can be applied to the vertical surface. Can be attached to.

[Brief description of drawings]

FIG. 1 is a side sectional view and a plan sectional view showing an ultrasonic distance sensor according to an embodiment of the present invention.

FIG. 2 is a front view showing an ultrasonic distance sensor and II in FIG.
FIG. 6 is a rear cross-sectional view taken along the line II.

FIG. 3 is a front view, a side sectional view, a rear view and a plan sectional view showing a sensor holder.

FIG. 4 is a front view, a partially cut side view, a rear view and a plan sectional view showing a rubber holder.

FIG. 5 is a front view, a side sectional view, a rear view and a plan sectional view showing a support plate.

6A and 6B are a front view and a partially cutaway plan view showing a rubber cover.

[Explanation of symbols]

10 ... Transducer, 11 ... Rubber holder, 12 ... Sensor holder, 13 ... Support plate, 14 ... Rubber cover, 15 ...
Transmitter, 16 ... Main body, 17, 18 ... Terminal, 19 ... Cable, 20 ... Recess, 21 ... Fixing hole, 22 ... Cable insertion hole, 23 ... Projection part, 24 ... Mounting hole, 25 ... Projection, 26 ...
Screw, 27 ... Adhesive member.

Claims (1)

[Scope of utility model registration request] 1. An ultrasonic distance sensor for detecting a distance to an object to be measured by transmitting and receiving ultrasonic waves, wherein a transducer is formed in a substantially cylindrical shape and transmits and receives ultrasonic waves, and a transducer is provided avoiding an ultrasonic transmission path of the transducer. A substantially cylindrical elastic holder that supports the sensor holder, a sensor holder that has a substantially annular shape and the elastic holder is housed in a recess formed in the center, and a support plate that is substantially flat and supports the sensor holder. And an annular elastic cover arranged around the support plate, wherein an adhesive member is fixed to the surface of the support plate opposite to the sensor holder support surface. Distance sensor.