CN218675294U - Ultrasonic sensor shell that shakes - Google Patents

Abstract

The utility model discloses an ultrasonic sensor vibration shell which is fixedly arranged on a shell through a front cover, the bottom surface of a cavity of the vibration shell is a vibration membrane, the surface of the vibration membrane positioned at the inner side of the cavity is provided with a bulge, and the thickness value of the bulge accounts for 1/5-1/3 of the total thickness value of the vibration membrane; the area of the bulge accounts for 2/5-4/5 of the total area of the diaphragm; the number of the protrusions is one. The utility model discloses a surface at the vibrating diaphragm sets up the arch to rationally set up bellied thickness and area, make ultrasonic sensor's detection range, sound pressure level and acceptance sensitivity obtain fine improvement.

Description

Ultrasonic sensor shell that shakes

Technical Field

The utility model relates to the field of automobiles, in particular to ultrasonic sensor shell that shakes.

Background

In the automotive field, ultrasonic sensors are often used with driver assistance systems. The working principle of the ultrasonic sensor is that P32 inputs 40 KHz-60 KHz alternating current to a piezoelectric sheet (also called Piezo), and the piezoelectric sheet is excited by the current and coupled with a vibrating diaphragm on a vibrating shell of the sensor to generate resonance, so as to send out an ultrasonic signal; because the ultrasonic wave belongs to mechanical wave, the ultrasonic detection scope (FOV) is decided by vibrating diaphragm and piezoelectric patch, and wherein, the vibrating diaphragm is especially crucial, and the design of vibrating diaphragm can play decisive effect to the detection scope. Influenced by the design of the vibrating diaphragm, the detection range of the ultrasonic sensor on the market is large overall, so that the capability aggregation is poor, and the problem of misinformation is easy to occur in an automatic parking scene. In addition, many ultrasonic sensors have a technical problem that the Sound Pressure Level (SPL) of the transmitted sound pressure is sufficient, but the reception sensitivity is low, or the reception sensitivity is sufficient, but the Sound Pressure Level (SPL) of the transmitted sound pressure is insufficient. These technical problems limit the application of ultrasonic sensors in automatic parking scenarios.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an ultrasonic sensor shell that shakes can realize the transmitting power gathering to make the sound pressure level and the receive sensitivity of sending the acoustic pressure reach better balance, reach the purpose that detection range reduces simultaneously.

In order to solve the technical problem, the ultrasonic sensor vibrating shell provided by the utility model is fixedly arranged on the shell through the front cover, the bottom surface of the cavity of the vibrating shell is a vibrating diaphragm, the surface of the vibrating diaphragm, which is positioned at the inner side of the cavity, is provided with a bulge, and the thickness value of the bulge accounts for 1/5-1/3 of the total thickness value of the vibrating diaphragm;

the area of the bulge accounts for 2/5-4/5 of the total area of the diaphragm;

the number of the protrusions is one.

Optionally, the cavity is formed into a kidney-shaped cylindrical cavity, and the top of the cavity is subjected to spherical material digging treatment with the diameter of D.

Optionally, the value D of the diameter is greater than the width value of the cavity and less than the outer diameter value of the vibrating shell.

Optionally, the vibrating shell is made of a metal material.

Optionally, the vibrating shell is made of metal aluminum.

Optionally, a decoupling element is further disposed between the housing, the front cover and the vibration shell, the decoupling element is annular, and the decoupling element is circumferentially sleeved on an outer edge of the opening end of the vibration shell.

Optionally, the decoupling element forms an interference fit with the horn.

Optionally, a piezoelectric sheet is attached to the top surface of the protrusion.

Optionally, the front cover and the housing are secured by a snap fit.

The utility model discloses a surface at the vibrating diaphragm sets up the arch to rationally set up bellied thickness and area, make ultrasonic sensor's detection range, sound pressure level and acceptance sensitivity obtain fine improvement.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings required for the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an embodiment of an ultrasonic sensor housing according to the present invention;

fig. 2 is a top view of an embodiment of the ultrasonic sensor housing of the present invention;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken in the direction B-B of FIG. 2;

fig. 5 is an exploded view of an ultrasonic sensor in an embodiment of the ultrasonic sensor housing of the present invention;

fig. 6 is a partial sectional view of an ultrasonic sensor in an embodiment of an ultrasonic sensor housing of the present invention.

In the figure, 1-vibrating shell; 11-a cavity; 12-a diaphragm; 13-a bump; 14-sphere; 2-front cover; 3-a housing; 4-a decoupling element; 5-piezoelectric sheet.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, a vibrating shell 1 of an ultrasonic sensor according to the present invention is shown, and is fixedly mounted on a housing 3 through a front cover 2, a vibrating diaphragm 12 is disposed on a bottom surface of a cavity 11 of the vibrating shell 1, a protrusion 13 is formed on a surface of the vibrating diaphragm 12 located inside the cavity 11, and a thickness value of the protrusion 13 accounts for 1/5-1/3 of a total thickness value of the vibrating diaphragm 12;

the area of the bulge 13 accounts for 2/5-4/5 of the total area of the diaphragm 12;

the number of the projections 13 is one.

In the embodiment of the present invention, the whole structure of the ultrasonic sensor is the same as that of the conventional ultrasonic sensor, that is, the vibration shell 1 is fixed to the housing 3 through the cooperation between the front cover 2 and the housing 3; the surface of the vibrating diaphragm 12 of the vibrating shell 1 is provided with the bulge 13, and a height difference (namely the thickness of the bulge 13) is formed between the part of the bulge 13 and the part of the vibrating diaphragm 12, which is not provided with the bulge 13, so that the vibrating diaphragm 12 can generate stronger vibration when being driven by the piezoelectric sheet 5, and the vibration part is mainly positioned at the part of the bulge 13, so that compared with the vibrating diaphragm 12 without the bulge 13, the generated sound pressure intensity is more concentrated, the detection range is smaller, and the application of automatic parking is more facilitated; meanwhile, when the ultrasonic sensor is switched to a receiving end, the thickness of the vibrating diaphragm 12 on the periphery of the bulge 13 is small based on the design mode of the bulge 13, so that the vibration is easy to start, and the receiving sensitivity is effectively improved. Through multiple verification, when the thickness value of the bulge 13 accounts for 1/5-1/3 of the total thickness value of the diaphragm 12, and the area of the bulge 13 accounts for 2/5-4/5 of the total area of the diaphragm 12, the improvement effects of the detection range, the sound pressure level and the receiving sensitivity are better, and preferably, the area of the bulge 13 accounts for 3/5 of the total area of the diaphragm 12. It should be noted that the shape of the protrusion 13 is not limited, and may be circular, oval, triangular, square, or the like. The position of the protrusion 13 is preferably located at the middle position of the diaphragm 12, but may not be located at the middle position, and a gap may exist between the protrusion 13 and the sidewall of the cavity 11.

In a specific embodiment, referring to fig. 2, 3 and 4, the cavity 11 is formed as a kidney-shaped cylindrical cavity, and the top of the cavity 11 is processed by spherical material drawing with a diameter D; preferably, the value D of the diameter is greater than the width value of the cavity 11 and less than the outer diameter value of the vibration shell 1. It should be noted that, the width of the cavity 11 refers to the width of the narrowest part of the waist-shaped cross section of the cavity 11, so that, understandably, when the cylindrical cavity with the waist-shaped cross section is subjected to the spherical material taking treatment, the spherical diameter D is at least larger than the width of the waist-shaped cross section (cavity width), otherwise, the material taking treatment cannot be performed, but the maximum value of the diameter D cannot be larger than the outer diameter of the vibrating shell 1; the shape of the final cavity 11 is a combination of a kidney-shaped cylindrical cavity and a spherical cavity, as shown in fig. 2, 3 and 4, and there is an intersection line between the spherical surface 14 formed after the material drawing treatment and the side wall of the kidney-shaped cylindrical cavity. The cavity 11 is designed in such a shape, so that the inner wall of the cavity is excessively smooth, and finally, the envelope diagram of the detection range of the ultrasonic sensor is smooth without abrupt corners, thereby being more beneficial to obtaining accurate ultrasonic detection precision.

In a specific embodiment, the vibrating shell 1 is made of a metal material, preferably metal aluminum, and more preferably, the hardness of the metal aluminum is HB90-95.

In a specific embodiment, a decoupling element 4 is further arranged between the outer shell 3, the front cover 2 and the vibration shell 1, the decoupling element 4 is arranged in an annular shape, and the decoupling element 4 is circumferentially sleeved on the outer edge of the opening end of the vibration shell 1; preferably, the decoupling element 4 is arranged in a ring shape with central axial symmetry of 360 °. Understandably, the decoupling element 4 mainly serves to absorb the vibration of the diaphragm 12, and is typically made of rubber. In this concrete trial, referring to fig. 5 and 6, the mounting method of the ultrasonic sensor is generally as follows: first, the piezoelectric sheet 5 is adhered to the surface of the protrusion 13 (usually by UV glue); then, sleeving the decoupling element 4 on the periphery of the opening of the vibration shell 1 (in interference fit between the decoupling element and the vibration shell), so as to form a semi-finished product; then, assembling the semi-finished product into the shell 3; finally, the front cover 2 is attached to the housing 3, forming an ultrasonic sensor. Usually, the front cover 2 and the housing 3 can be fixedly connected by means of fasteners, and the fasteners are preferably uniformly distributed on the front cover 2 and the housing 3, and the number of the fasteners can be 2, 3 or 4, or more; however, it is understood that the snap connection is not the only connection between the front cover 2 and the housing 3, and the two can be connected by gluing or the like.

To sum up, the utility model discloses a surface at the vibrating diaphragm sets up arch 13 to rationally set up protruding 13 thickness and area, make ultrasonic sensor's detection range, sound pressure level and acceptance sensitivity obtain fine improvement.

The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements and the like made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A vibration shell of an ultrasonic sensor is fixedly arranged on a shell through a front cover, and a vibration membrane is arranged on the bottom surface of a cavity of the vibration shell, and is characterized in that a bulge is formed on the surface of the vibration membrane positioned on the inner side of the cavity, and the thickness value of the bulge accounts for 1/5-1/3 of the total thickness value of the vibration membrane;

the area of the bulge accounts for 2/5-4/5 of the total area of the diaphragm;

the number of the protrusions is one.

2. The ultrasonic sensor vibration shell according to claim 1, wherein the cavity is formed as a kidney-shaped cylindrical cavity, and the top of the cavity is processed by a spherical material with a diameter D.

3. The ultrasonic sensor horn of claim 2 wherein the diameter has a value D greater than the width of the cavity and less than the outer diameter of the horn.

4. The ultrasonic transducer housing of claim 2, wherein the housing is made of metal.

5. The ultrasonic transducer housing of claim 4, wherein the housing is aluminum metal.

6. The ultrasonic transducer oscillator housing of claim 1, wherein a decoupling element is disposed between the housing, the front cover and the oscillator housing, the decoupling element is configured in a ring shape, and the decoupling element is circumferentially sleeved on an outer edge of the open end of the oscillator housing.

7. The ultrasonic sensor horn of claim 6 wherein the decoupling element forms an interference fit with the horn.

8. The ultrasonic sensor horn of claim 1 wherein a piezoelectric patch is attached to the top surface of the boss.

9. The ultrasonic sensor horn of any one of claims 1-8, wherein the front cover and the housing are secured by a snap fit.

Images