CN215773744U

CN215773744U - Ultrasonic sensor with flexible circuit board

Info

Publication number: CN215773744U
Application number: CN202121352302.7U
Authority: CN
Inventors: 欧阳发; 陈富; 朱兆焱
Original assignee: Audiowell Electronics Guangdong Co ltd
Current assignee: Audiowell Electronics Guangdong Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-02-08
Anticipated expiration: 2031-06-17

Abstract

The utility model discloses an ultrasonic sensor with a flexible circuit board, which comprises: the shell is provided with an inner cavity, and a first opening communicated with the inner cavity is further formed in the lower end of the shell; the base assembly comprises a base body and a contact pin, the base body covers the first opening, a clamping position for communicating the inner cavity with the outside is formed in the base body, and the contact pin is connected to the lower end of the base body and extends downwards; a vibrating assembly mounted in the internal cavity; one end of the flexible circuit board is electrically connected with the contact pin, the other end of the flexible circuit board penetrates through the clamping position to enter the inner cavity and is electrically connected with the vibration assembly, and the flexible circuit board is clamped in the clamping position. The flexible circuit in the ultrasonic sensor with the flexible circuit board is stable in connection and not easy to shift, and the condition of connection failure can be effectively avoided.

Description

Ultrasonic sensor with flexible circuit board

Technical Field

The utility model relates to the technical field of ultrasonic sensors, in particular to an ultrasonic sensor with a flexible circuit board.

Background

The open type ultrasonic sensor is realized by the vibration of a vibration component, wherein, the vibrator starts to vibrate, and then transmits the vibration to a resonator of the sensor to cause the resonator to resonate, thereby completing the function of transmitting or receiving ultrasonic waves. The open type ultrasonic sensor has wide application in daily life and work.

In the prior art, the inside of one type of open ultrasonic sensor is connected with an internal circuit by adopting a lead, but because the space inside the sensor is narrow and small, the lead is connected with each part by adopting a welding mode, the lead is difficult to reach the welding standard during welding operation, and the phenomenon that the welding position is loosened and falls off easily occurs in the use process.

In addition, there is an open type ultrasonic sensor using an FPC flexible circuit, which can reduce the number of welding positions and obtain a better connection effect than the above structure. However, as compared with the conductive wires, the FPC flexible circuit has a larger width and a reduced deformability, and if the FPC flexible circuit is not fixed or limited well, the FPC flexible circuit is easily loosened and connection failure is caused, so that the cost is increased but the structural stability is not improved by the same amount.

SUMMERY OF THE UTILITY MODEL

In order to overcome some defects in the prior art, the utility model aims to provide the ultrasonic sensor with the flexible circuit board, wherein the flexible circuit is stable in connection and not easy to shift, and the connection failure can be effectively avoided.

The purpose of the utility model is realized by adopting the following technical scheme:

an ultrasonic sensor with a flexible circuit board, comprising:

the shell is provided with an inner cavity, and a first opening communicated with the inner cavity is further formed in the lower end of the shell;

the base assembly comprises a base body and a contact pin, the base body covers the first opening, a clamping position for communicating the inner cavity with the outside is formed in the base body, and the contact pin is connected to the lower end of the base body and extends downwards;

a vibrating assembly mounted in the internal cavity;

one end of the flexible circuit board is electrically connected with the contact pin, the other end of the flexible circuit board penetrates through the clamping position to enter the inner cavity and is electrically connected with the vibration assembly, and the flexible circuit board is clamped in the clamping position.

Furthermore, the clamping position is arranged on the periphery of the base body and is in a first open groove shape; when the base body covers the first opening, the cross-sectional area of the clamping position is in a strip shape matched with the flexible circuit board.

Furthermore, the clamping position avoids the arrangement of the contact pin and is in a through hole shape which is through from top to bottom, and the cross section of the clamping position is in a strip shape matched with the flexible circuit board.

Furthermore, the shell is connected with the first opening in a detachable clamping mode.

Furthermore, a second opening communicated with the inner cavity is formed in the upper end of the shell.

Furthermore, a grid is arranged on the second opening.

Further, the flexible circuit board comprises a vertical part and a transverse part, wherein the vertical part is connected to the center of the transverse part and is in an inverted T shape in an unfolded state; the vertical portion penetrates through the clamping position to be electrically connected with the vibration assembly, and the transverse portion is electrically connected with the contact pin.

Further, the vertical portion has a constant width in the longitudinal direction.

Furthermore, the upper end of the vertical part is provided with a positive electrode welding spot and a negative electrode welding spot, the transverse part is provided with a welding through hole, and the welding spots are electrically connected with the welding through hole; the vibration assembly is connected with the positive welding spot and the negative welding spot in a welding mode, and the contact pins are inserted into the welding through holes and connected in a welding mode.

Further, the vibration component comprises a silver sheet, a metal vibrating sheet and a resonator which are sequentially connected from bottom to top, the positive electrode of the silver sheet is connected with the positive electrode welding spot in a welded mode, and the negative electrode of the silver sheet is connected with the negative electrode welding spot in a welded mode.

The ultrasonic sensor with the flexible circuit board is connected with the base component in a covering mode through the shell, a relatively closed inner cavity environment is formed in the shell, and a foundation is provided for installation and protection of other components; wherein, the base subassembly has the effect of lid and base, and the structure is high-efficient succinct.

More importantly, still be equipped with the block position on the base body, after being located the contact pin and the vibration subassembly inside and outside the inner chamber respectively when the flexible circuit board connection, because it passes and the block is in the block position, can prevent that ultrasonic sensor from causing the flexible circuit board to shift because external force when using or transporting. Particularly, for the vibration component, the flexible circuit board is positioned at a position which is difficult to observe and overhaul in the inner cavity, and the flexible circuit board is easy to displace under the action of long-time repeated high-frequency vibration of the vibration component; the structure ensures the position of the flexible circuit board, ensures the connection reliability between the flexible circuit and the vibration assembly, reduces the maintenance difficulty and prolongs the service life of the ultrasonic sensor.

Drawings

FIG. 1 is an exploded view of an ultrasonic sensor with a flexible circuit board according to the present invention;

FIG. 2 is a perspective view of a first base assembly according to the present embodiment;

FIG. 3 is a perspective view of the first base assembly in an installed condition;

FIG. 4 is a perspective view of a first base assembly according to the present embodiment;

FIG. 5 is a schematic diagram of the unfolded state of the flexible circuit board in the present invention;

FIG. 6 is a schematic bottom view of the flexible printed circuit board of the present invention mounted with silver plate and metal vibrating plate;

FIG. 7 is a perspective view of a first angle of the flexible circuit board, silver plate, metal vibrating plate and base assembly of the present invention;

FIG. 8 is a perspective view of a second angle of the flexible circuit board with the silver plate, the metal vibrating plate and the base assembly of the present invention;

FIG. 9 is a first perspective view of an ultrasonic sensor with a flexible circuit board according to the present invention;

FIG. 10 is a second perspective view of an ultrasonic sensor with a flexible circuit board according to the present invention;

in the figure, 1-shell, 11-first opening, 12-second opening, 13-grid, 2-base component, 21-base body, 211-clamping position, 22-pin, 3-vibration component, 31-silver sheet, 311-positive electrode, 312-negative electrode, 32-metal vibration sheet, 33-resonator, 4-flexible circuit board, 41-vertical part, 411-positive electrode welding point, 412-negative electrode welding point, 42-horizontal part, 421-welding through hole and 5-adhesive.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are 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 one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Fig. 1 to 10 show an ultrasonic sensor with a flexible circuit board according to the present invention, which includes a housing 1, a base member 2, a vibration member 3, and a flexible circuit board 4:

the shell 1 is provided with an inner cavity, the lower end of the shell 1 is also provided with a first opening 11 communicated with the inner cavity, the shell 1 can protect components needing to be installed in the shell, and when the shell is installed, the components are installed in the inner cavity from the first opening 11;

the base component 2 comprises a base body 21 and a pin 22, the base body 21 is covered in the first opening 11, a clamping position 211 for communicating the inner cavity with the outside is formed on the base body 21, and the pin 22 is connected to the lower end of the base body 21 and extends downwards; the base component 2 has the functions of a cover body and a base, the structure is efficient and simple, and the clamping position 211 is matched with the shape and the size of the flexible circuit board 4.

The vibration component 3 is arranged in the inner cavity, and the vibration component 3 is used for generating vibration to generate ultrasonic waves, receiving the ultrasonic waves and the like;

one end of the flexible circuit board 4 is electrically connected to the contact pin 22, the other end of the flexible circuit board passes through the clamping position 211 to enter the inner cavity and is electrically connected to the vibration component 3, and the flexible circuit board 4 is clamped in the clamping position 211. After the flexible circuit board 4 is connected to the contact pin 22 and the vibration component 3 respectively located inside and outside the inner cavity, the flexible circuit board 4 can be prevented from being displaced due to an external force when the ultrasonic sensor is used or transported because the flexible circuit board passes through and is clamped in the clamping position 211. Especially for the vibration component 3, the flexible circuit board 4 is positioned at a position which is difficult to observe and overhaul in the inner cavity, and the flexible circuit board 4 is easy to displace under the action of long-time repeated high-frequency vibration of the vibration component 3; the structure ensures the position of the flexible circuit board 4, ensures the connection reliability between the flexible circuit and the vibration component 3, reduces the maintenance difficulty and prolongs the service life of the ultrasonic sensor.

In terms of the specific location and structure of the snap-fit location 211, the present embodiment provides two preferred solutions as follows:

the first method comprises the following steps: as shown in fig. 2 and 3, the engaging position 211 is opened on the periphery of the base body 21 and has a groove shape of the first opening 11; when the base body 21 is covered in the first opening 11, the cross-sectional area of the engaging portion 211 is a strip shape matching with the flexible circuit board 4, so as to perform positioning from various angular directions. This configuration has advantages in manufacturing and assembly. During manufacturing, the outer side of the base body 21 is directly provided with the groove; during assembly, the lower end of the flexible circuit board 4 is connected with the contact pin 22, and then is connected with the vibration component 3 by turning up the outer side of the upper end base body 21, and the side surface can be naturally clamped into the clamping position 211 without additional operation; in the aspect of fixing effect, after the base body 21 is covered in the first opening 11, the clamping position and the inner side of the shell 1 can also form an approximately closed strip shape, so that the positioning and clamping effects can be better realized.

And the second method comprises the following steps: as shown in fig. 4, the engaging position 211 is arranged to be free from the contact pin 22 and is in a through hole shape penetrating up and down, and a cross section of the engaging position 211 is in a strip shape matching with the flexible circuit board 4. This configuration has further advantages in terms of positioning effect. Because block position 211 itself is the through-hole form of enclosing all around, so before installation shell 1, flexible circuit board 4 just can fix a position in block position 211 completely, reaches fine location effect, need not to rely on the assembly precision between shell 1 and the base body 21, even there is the gap between shell 1 and the base body 21, also can not make flexible circuit board 4 shift out from the gap easily consequently, the effect of preventing to connect inefficacy and anti-drop is better.

In terms of the connection structure between the housing 1 and the base assembly 2, the present embodiment preferably has a detachable snap connection between the housing 1 and the first opening 11. The existing open type ultrasonic sensor generally adopts a mode of no cover, and glue is filled between a base and a shell 1 for connecting and fixing, but the glue filling connection mode has the defects of unrepairable and disposable use. In the embodiment, the shell 1 and the first opening 11 are detachably connected in a clamping manner, so that the maintenance of the ultrasonic sensor becomes possible, and the cost can be further saved; in addition, during manufacturing, the base body 21 is clamped into the first opening 11, glue injection is not needed, the process of waiting for glue drying is omitted, time is short, the number of processes is less, production efficiency can be improved, and harm of gas emitted by glue to bodies of manufacturing personnel can be reduced.

In order to better transmit sound waves between the inner cavity and the outside, in this embodiment, a second opening 12 communicating with the inner cavity is further formed at the upper end of the housing 1, and the ultrasonic waves can be transmitted without hindrance through the second opening 12. More preferably, the second opening 12 is further provided with a grid 13, and the grid 13 can prevent external impurities from entering the inner cavity and protect components in the inner cavity from being damaged by the outside on the premise of ensuring most openings and not hindering sound wave propagation.

The flexible circuit in the prior art generally adopts a cross-shaped structure, and the positive and negative welding points are arranged at the two transverse ends of the longitudinal substrate, so that the flexible circuit board 4 has more materials, high material cost, two times of welding and high labor cost. The flexible circuit board 4 in this embodiment includes a vertical portion 41 and a horizontal portion 42, the vertical portion 41 is connected to the center of the horizontal portion 42, and is in an inverted t shape in an unfolded state; the vertical portion 41 passes through the engaging position 211 to be electrically connected to the vibration component 3, and the horizontal portion 42 is electrically connected to the pin 22. The flexible circuit board 4 with the structure uses less materials, and in the welding process, because the parts connected with the vibration component 3 are concentrated on the vertical parts 41, when the only vertical part 41 is connected, the welding process can be carried out by turning over once, the welding action can be automatically completed by equipment, and the efficiency is higher. In addition, the structure is more suitable for being matched with the clamping position 211, only one clamping position 211 needs to be arranged on the base, and the requirement on manufacturing precision is lowered. Furthermore, it is preferable that the width of the vertical portion 41 is constant in the longitudinal direction, and thus, when the connector is mounted, the vertical portion 41 can be well fitted to the engaging portion 211 regardless of the engagement of the vertical portion 41, thereby achieving a good positioning effect.

Specifically, the upper end of the vertical portion 41 is provided with a positive electrode welding point 411 and a negative electrode welding point 412, and the positive electrode welding point 411 and the negative electrode welding point 412 are arranged at intervals up and down along the length direction of the vertical portion 41 so as to match with the positive electrode and the negative electrode which are distributed along the radial direction on the general silver sheet 31; the transverse part 42 is provided with a welding through hole 421, and the welding point is electrically connected with the welding through hole 421; the vibration assembly 3 is connected with the positive electrode welding point 411 and the negative electrode welding point 412 in a welding mode, and the contact pin 22 is inserted into the welding through hole 421 and connected in a welding mode.

As a preferable scheme of the vibration component 3, the vibration component 3 includes a silver sheet 31, a metal vibrating sheet 32 and a resonator 33 which are sequentially connected from bottom to top, an anode 311 of the silver sheet 31 is connected with the anode welding point 411 in a welded manner, and a cathode 312 of the silver sheet 31 is connected with the cathode welding point 412 in a welded manner. The silver plate 31 and the base body 21 and the resonator 33 and the metal vibrating plate 32 are preferably connected together by an adhesive 5 to further improve the stability of the connection.

In order to obtain a larger inner cavity space under the premise of a certain material consumption, in this embodiment, it is preferable that the housing 1 is cylindrical, the inner cavity is cylindrical, and the first opening 11 is circular; the base body 21 is in the shape of a dome matching the first opening 11. The predominantly cylindrical shape allows for a larger interior space than other shapes such as square, and is simpler than spherical fabrication and is compatible with typical installation situations.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. An ultrasonic sensor with a flexible circuit board, comprising:

a vibrating assembly mounted in the internal cavity;

2. The ultrasonic sensor with a flexible circuit board according to claim 1, wherein the engaging portion is provided on a peripheral side of the base body and has a first slit shape; when the base body covers the first opening, the cross-sectional area of the clamping position is in a strip shape matched with the flexible circuit board.

3. The ultrasonic sensor with the flexible circuit board according to claim 1, wherein the engaging portion is disposed to avoid the contact pin and has a through hole shape penetrating from top to bottom, and a cross section of the engaging portion has a strip shape matching with the flexible circuit board.

4. The ultrasonic sensor with the flexible circuit board according to claim 2 or 3, wherein the housing is detachably connected with the first opening in a clamping manner.

5. The ultrasonic sensor with the flexible circuit board as claimed in claim 4, wherein the upper end of the housing further defines a second opening communicating with the inner cavity.

6. The ultrasonic sensor with a flexible circuit board according to claim 5, wherein a grid is further provided on the second opening.

7. The ultrasonic sensor with the flexible circuit board according to claim 4, wherein the flexible circuit board includes a vertical portion and a horizontal portion, the vertical portion is connected to a center of the horizontal portion, and is in a "t" shape in a deployed state; the vertical portion penetrates through the clamping position to be electrically connected with the vibration assembly, and the transverse portion is electrically connected with the contact pin.

8. The ultrasonic sensor with a flexible circuit board according to claim 7, wherein the vertical portion has a constant width in a length direction.

9. The ultrasonic sensor with the flexible circuit board according to claim 7, wherein the vertical portion has a positive electrode pad and a negative electrode pad at an upper end thereof, the horizontal portion has a welding through hole, and the pads are electrically connected to the welding through hole; the vibration assembly is connected with the positive welding spot and the negative welding spot in a welding mode, and the contact pins are inserted into the welding through holes and connected in a welding mode.

10. The ultrasonic sensor with the flexible circuit board according to claim 9, wherein the vibrating member comprises a silver plate, a metal resonator plate and a resonator, which are connected in sequence from bottom to top, wherein a positive electrode of the silver plate is connected to the positive electrode solder joint in a welding manner, and a negative electrode of the silver plate is connected to the negative electrode solder joint in a welding manner.