CN112705449B

CN112705449B - Ultrasonic transducer

Info

Publication number: CN112705449B
Application number: CN202110052211.XA
Authority: CN
Inventors: 张丹阳; 俞胜平
Original assignee: Goertek Microelectronics Inc
Current assignee: Goertek Microelectronics Inc
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2022-05-13
Anticipated expiration: 2041-01-14
Also published as: CN112705449A

Abstract

The invention discloses an ultrasonic transducer which is characterized by comprising a shell and an ultrasonic component; the shell is provided with a first side part, a through hole area is arranged on the first side part, and the through hole area extends along the length direction of the first side part; the ultrasonic assembly is installed to the holding intracavity, and correspond the setting of via hole district to make certainly the sound wave that the ultrasonic assembly produced is along the via hole district transmits out. The ultrasonic wave subassembly install to in the holding chamber, the sound wave that the ultrasonic wave subassembly produced certainly the via hole district transmits out, the via hole district follows the length direction extension of first lateral part sets up for the sound wave that transmits out is in the length direction of first lateral part is the highest, and the position outside the via hole district, sound wave intensity produces obvious change, is convenient for ultrasonic transducer's directive property demand.

Description

Ultrasonic transducer

Technical Field

The invention relates to the field of acoustic-electric converters, in particular to an ultrasonic transducer.

Background

An ultrasonic transducer is a device that converts electrical power into mechanical power (i.e., ultrasonic waves) using the inverse piezoelectric effect. Meanwhile, the ultrasonic transducer can also convert the received ultrasonic signals into electric signals by utilizing the piezoelectric effect and can be used as a sensor.

At present, an ultrasonic transducer is mainly wide-angle type, and in a sound pressure directivity test, the sound pressure level can be kept stable (attenuation is less than 6dB) within 120 degrees (single side 60 degrees) or even wider angles, so that the directivity requirement of an ultrasonic wave beam cannot be met.

Disclosure of Invention

The invention mainly aims to provide an ultrasonic transducer, and aims to solve the problems of the ultrasonic transducer.

In order to achieve the above object, the present invention provides an ultrasonic transducer comprising:

the shell is internally provided with an accommodating cavity and is provided with a first side part, a via hole area is arranged on the first side part, and the via hole area extends along the length direction of the first side part; and the number of the first and second groups,

the ultrasonic assembly is installed in the accommodating cavity and corresponds to the via hole area, so that the sound waves generated by the ultrasonic assembly are transmitted out along the via hole area.

Optionally, the housing includes:

a base; and the number of the first and second groups,

the cover plate is arranged on the base to form the accommodating cavity together with the base in an enclosing manner;

the via hole area is arranged on the cover plate.

Optionally, a through hole is arranged on the first side portion in a penetrating manner, the through hole extends along the length direction of the first side portion, and the extending area of the through hole forms the through hole area.

Optionally, a plurality of via holes are arranged through the first side portion, the via holes are arranged at intervals along the length direction of the first side portion, and the through hole region is formed by the arrangement region of the via holes.

Optionally, the ultrasound assembly includes:

the mounting bracket is mounted in the accommodating cavity and is provided with a mounting part corresponding to the via hole area; and (c) a second step of,

and the piezoelectric energy conversion piece is mounted on the mounting part and used for converting electric energy and vibration mechanical energy.

Optionally, a mounting groove is formed in the mounting bracket corresponding to the through hole region, and the mounting groove forms the mounting portion;

the piezoelectric energy conversion piece is arranged at the opening of the mounting groove.

Optionally, the number of the mounting portions is multiple, and the mounting portions are arranged on the mounting bracket at intervals along the length direction of the first side portion;

the piezoelectric transduction piece corresponds the installation department is provided with a plurality ofly.

Optionally, the number of the mounting brackets is multiple, the mounting brackets are arranged at intervals along the length direction of the first side portion, and each mounting bracket is provided with the mounting portion;

Optionally, the piezoelectric transducer plate is made of electrostrictive material.

Optionally, the piezoelectric transducer is a piezoelectric ceramic sheet.

In the technical scheme of the invention, the ultrasonic assembly is installed in the accommodating cavity, the sound wave generated by the ultrasonic assembly is transmitted out of the via hole area, and the via hole area is arranged in an extending manner along the length direction of the first side part, so that the transmitted sound wave has the highest intensity in the length direction of the first side part, and the intensity of the sound wave is obviously changed at positions outside the via hole area, thereby facilitating the directional requirement of the ultrasonic transducer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to the structures shown in the drawings without creative efforts.

FIG. 1 is a diagram illustrating a test of a directional relationship between a deflection angle and sound pressure of an ultrasonic transducer in the prior art;

fig. 2 is a schematic perspective view of an ultrasonic transducer according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along A-A in FIG. 2;

FIG. 4 is a schematic perspective view of another embodiment of an ultrasonic transducer according to the present invention

FIG. 5 is a diagram illustrating a directional relationship between deflection angle and sound pressure of an ultrasonic transducer according to the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Ultrasonic transducer	1b	Cover plate
1	Shell body	2	Ultrasonic assembly
				11	Via region	21	Mounting bracket
1a	Base seat	22	Piezoelectric transduction piece

The implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.

It should be noted that, if the present embodiment relates to a directional indication, the directional indication is only used to explain a relative positional relationship, a motion situation, and the like between components in a specific posture, and if the specific posture is changed, the directional indication is changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, a relationship between a deflection angle and a sound pressure of an ultrasonic transducer is shown in a directivity test experiment of the conventional ultrasonic transducer.

The invention provides an ultrasonic transducer, wherein fig. 1 to 5 are embodiments provided by the invention.

Referring to fig. 2 to 3, the present invention provides an ultrasonic transducer 100, which includes a housing 1 and an ultrasonic component 2; an accommodating cavity is formed in the shell 1, the shell 1 is provided with a first side part, a through hole area 11 is arranged on the first side part, and the through hole area 11 extends along the length direction of the first side part; the ultrasonic assembly 2 is installed in the accommodating cavity and is arranged corresponding to the through hole area 11, so that the sound waves generated by the ultrasonic assembly 2 are transmitted out along the through hole area.

In the technical scheme of the present invention, the ultrasonic assembly 2 is installed in the accommodating cavity, the sound wave generated by the ultrasonic assembly 2 is transmitted out from the through hole region 11, and the through hole region 11 is extended along the length direction of the first side portion, so that the transmitted sound wave has the highest intensity in the length direction of the first side portion, and the intensity of the sound wave is obviously changed at a position outside the through hole region, thereby facilitating the directivity requirement of the ultrasonic transducer 100.

Specifically, the housing 1 includes a base 1a and a cover plate 1 b; the cover plate 1b is arranged on the base 1a to form the accommodating cavity together with the base 1a in an enclosing manner; the through hole region 11 is arranged on the cover plate 1 b. The base 1a and the cover plate 1b are matched with each other to form the shell 1, so that the ultrasonic assembly 2 is installed in the accommodating cavity.

It should be noted that, there are various matching manners between the base 1a and the cover plate 1b, for example, the base and the cover plate are mutually connected by a snap fit through a mutually matching snap fit groove and a snap fit, or are directly connected together by a fixing glue, so long as it is ensured that the cover plate 1b is mounted on the base 1 a.

Referring to fig. 4, in an embodiment of the present invention, a via hole is disposed through the first side portion, the via hole extends along a length direction of the first side portion, and an extending region of the via hole forms the via hole region 11. In this embodiment, the through hole extends along the length direction of the first side portion, the sound wave emitted by the ultrasonic component 2 passes through the through hole to form a directional sound wave band with the highest sound wave intensity extending along the length direction, and the sound wave intensity gradually decreases along the width direction of the first side portion, so that the directional direction of the ultrasonic transducer 100 is conveniently distinguished, and when the deflection occurs, the intensity change of the sound wave is obvious.

In another embodiment provided by the present invention, a plurality of via holes are formed through the first side portion, the plurality of via holes are arranged at intervals along the length direction of the first side portion, and the region where the plurality of via holes are arranged constitutes the via hole region 11. The sound waves penetrate through the through holes, and due to mutual overlapping and diffraction of the sound waves, a pointing sound wave band with the highest sound wave intensity is formed along the length direction, so that the pointing in the length direction is facilitated.

On the other hand, the ultrasonic assembly 2 includes a mounting bracket 21 and a piezoelectric transducer 22; the mounting bracket 21 is mounted in the accommodating cavity, and a mounting part is arranged on the mounting bracket 21 corresponding to the through hole area; the piezoelectric transducer piece 22 is mounted to the mounting portion to convert electrical energy and vibrational mechanical energy. The mounting bracket 21 provides edge fixing and supporting for the piezoelectric transducer 22, so that the piezoelectric transducer 22 can be conveniently mounted and vibrated.

Specifically, the mounting bracket 21 is provided with a mounting groove corresponding to the through hole region, and the mounting groove forms the mounting portion; the piezoelectric transducer piece 22 is arranged at the opening of the mounting groove. A vibration space is reserved for the vibration of the piezoelectric transducer piece 22.

It should be noted that the opening shape of the mounting groove may be formed in various manners, such as circular, oval, racetrack, polygonal, etc., and different opening shapes may be selected according to different vibration requirements.

In addition, the material of the mounting bracket 21 may be selected from materials with high strength, such as ceramic, glass, epoxy plate, etc., and is not limited herein.

In an embodiment of the present invention, the mounting portions are provided in plurality, and the mounting portions are arranged on the mounting bracket 21 at intervals along the length direction of the first side portion; the piezoelectric transducer pieces 22 are provided in plural corresponding to the mounting portions. So that produce stronger sound wave for application range is farther better with the effect, installing support 21 is provided with one, and is direct be in set up a plurality of installation departments on installing support 2, it is a plurality of to be convenient for make and fixed, guarantee the relative position of installation department.

In another embodiment of the present invention, a plurality of mounting brackets 21 are provided, the plurality of mounting brackets 21 are arranged at intervals along the length direction of the first side portion, and each mounting bracket 21 is provided with the mounting portion; the piezoelectric transducer pieces 22 are provided in plural corresponding to the mounting portions. So that a different number of mounting brackets 21 can be added or reduced for different situations.

Further, the piezoelectric transducer 22 is made of electrostrictive material. So as to convert the electrical energy into the vibrating mechanical energy.

The piezoelectric transducer 22 may be made of a piezoelectric material such as lead zirconate titanate PZT, barium titanate BT, or potassium sodium niobate KNN.

Specifically, in this embodiment, the piezoelectric transducer is a piezoelectric ceramic plate. So as to perform bending vibration under the driving of an electric signal and emit ultrasonic waves outwards.

It should be noted that, for different vibration requirements, the shape of the piezoelectric transducer may be one of a square, a rectangle, a circle, and a polygon.

Referring to fig. 5, in an embodiment of the present invention, the thickness of the first side of the housing 1 is set to be 0.1mm, so that the weight of the ultrasonic transducer 100 can be reduced while the propagation of the sound wave can be blocked; in addition, a plurality of through holes are arranged on the first side portion in a penetrating mode, the diameter of each through hole is 0.5mm, the distance between every two adjacent beard holes is 1mm, the length of a through hole area formed by the arrangement of the through holes is 12mm, the directivity effect brought by the cooperation is the best, and the sound pressure of 30-degree deflection is reduced by more than 6dB and the sound pressure of 40-degree deflection is reduced by more than 10dB along the width direction of the ultrasonic transducer 100. So that the directivity and practicality of the ultrasonic transducer 100 are optimized.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the present specification and drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An ultrasonic transducer, comprising:

the shell is internally provided with an accommodating cavity and is provided with a first side part, the first side part is provided with a through hole area, and the through hole area extends along the length direction of the first side part; and the number of the first and second groups,

ultrasonic component, install extremely the holding intracavity, and correspond via hole district sets up, so that certainly the sound wave that ultrasonic component produced is along via hole district transmits out, ultrasonic component follows the length direction of first lateral part is equipped with a plurality ofly, and is a plurality of the sound wave that ultrasonic component produced can be in each other the holding intracavity can be strayed and/or diffract, forms a directional acoustic wave zone that extends along length direction, follows the width direction of first lateral part, sound intensity reduces gradually, wherein, the intensity of directional acoustic wave zone is greater than the sound wave intensity of the width direction of first lateral part.

2. The ultrasonic transducer of claim 1, wherein the housing comprises:

a base; and the number of the first and second groups,

the via hole area is arranged on the cover plate.

3. The ultrasonic transducer according to claim 1, wherein a via hole is formed through the first side portion, the via hole extends along a length direction of the first side portion, and an area where the via hole extends constitutes the via hole area.

4. The ultrasonic transducer according to claim 1, wherein a plurality of vias are formed through the first side portion, the plurality of vias are spaced apart along a length direction of the first side portion, and a region in which the plurality of vias are formed constitutes the via region.

5. The ultrasonic transducer of claim 1, wherein the ultrasonic assembly comprises:

the mounting bracket is mounted in the accommodating cavity and is provided with a mounting part corresponding to the through hole area; and the number of the first and second groups,

and the piezoelectric energy conversion piece is arranged on the installation part and used for converting the electric energy and the vibration mechanical energy.

6. The ultrasonic transducer according to claim 5, wherein a mounting groove is formed on the mounting bracket corresponding to the via hole region, and the mounting groove forms the mounting portion;

7. The ultrasonic transducer according to claim 5, wherein the mounting portion is provided in plurality, and the mounting portions are provided on the mounting bracket at intervals along a length direction of the first side portion;

8. The ultrasonic transducer according to claim 5, wherein a plurality of the mounting brackets are provided, the plurality of the mounting brackets are arranged at intervals along the length direction of the first side portion, and each of the mounting brackets is provided with the mounting portion;

9. The ultrasonic transducer of claim 5, wherein the piezoelectric transducer plate is an electrostrictive material.

10. The ultrasonic transducer of claim 9, wherein the piezoelectric transducer plate is a piezoceramic plate.