CN218099014U

CN218099014U - Ultrasonic detection device

Info

Publication number: CN218099014U
Application number: CN202222419013.5U
Authority: CN
Inventors: 李哲; 曹雪; 段平华
Original assignee: Telefonaktiebolaget LM Ericsson AB
Current assignee: Telefonaktiebolaget LM Ericsson AB
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2022-12-20
Anticipated expiration: 2032-09-13

Abstract

The utility model relates to an ultrasonic testing device, ultrasonic testing device is suitable for and carries out nondestructive test to printed circuit board (7) or part (8) of setting on printed circuit board (7). The ultrasonic testing device comprises an ultrasonic transducer (1) and a container (2) for containing an ultrasonic couplant (6), wherein the container (2) comprises a rigid side wall and a bottom formed by a flexible film (3). According to the utility model discloses an ultrasonic testing device can carry out nondestructive test under the condition that need not to make printed circuit board or the part of locating on it submerge.

Description

Ultrasonic detection device

Technical Field

The utility model relates to a nondestructive test technical field especially relates to a be suitable for and carry out nondestructive test's ultrasonic testing device to printed circuit board or the part of setting on printed circuit board.

Background

Non-Destructive Testing (NDT), also called nondestructive Testing, is a Testing means for Testing the surface and internal quality of a component, and it uses principle technologies such as ray, ultrasound, infrared, and electromagnetic, and combines with an instrument, and on the premise of not damaging or affecting the use performance of the object to be tested, it detects whether there is a defect or Non-uniformity in the object to be tested, and gives information such as the size, position, property, and quantity of the defect, and then determines the technical status (such as whether it is qualified, remaining life, etc.) of the object to be tested.

A Scanning Acoustic Microscope SAM (Scanning Acoustic Microscope) based on ultrasonic waves is an important nondestructive testing method, and is widely used for detecting defects such as cracks and faults inside electronic components and Printed Circuit boards PCB (Printed Circuit Board). Ultrasound can better locate voids and debonds between material layers than other non-destructive methods because ultrasound can view the interior of material layers and detect extremely thin air gaps and faults down to one hundredth of a micron.

SUMMERY OF THE UTILITY MODEL

Since ultrasonic waves can only propagate in liquids and solids, the inspected components need to be immersed in a liquid (usually water) to achieve effective coupling of the inspection probe to the inspected components. Therefore, the existing SAM is not suitable for water-sensitive electronic components. In addition, the existing SAM needs to dry the detected part after the detection is finished, so that the time of the whole detection process is prolonged.

In view of the above technical problem, the present invention is directed to provide an ultrasonic testing apparatus for nondestructive testing without immersing a printed circuit board or a component provided thereon in water.

Particularly, the utility model provides a be suitable for to printed circuit board or set up the ultrasonic testing device who carries out nondestructive test to the part on printed circuit board, ultrasonic testing device includes ultrasonic transducer and the container that is used for holding the ultrasonic couplant, the container includes rigid lateral wall and the bottom that comprises the flexible membrane.

In one embodiment of the present invention, the flexible membrane is made of an organic polymer material.

In one embodiment of the invention, the organic polymeric material is plastic or rubber.

In one embodiment of the present invention, the thickness of the flexible membrane is set according to an operating frequency of the ultrasonic transducer.

In one embodiment of the present invention, the thickness of the flexible film is 0.01mm to 0.1mm.

In one embodiment of the invention, the side wall of the container is made of a transparent glass or resin material.

In one embodiment of the present invention, the ultrasonic transducer is a piezoelectric, capacitive, electromagnetic, magnetostrictive, or electrostrictive ultrasonic transducer.

In one embodiment of the present invention, the lower end of the ultrasonic transducer is provided with an acoustic focusing lens.

In one embodiment of the present invention, the ultrasonic transducer is connected to an ultrasonic analyzer by a wire.

In one embodiment of the present invention, the ultrasound coupling agent is water or ethanol.

According to the utility model discloses an ultrasonic testing device is when using, puts into ultrasonic transducer and holds ultrasonic couplant, for example aquatic in the container, and the flexible membrane that constitutes the container bottom can closely laminate on being detected the part on the surface under the action of gravity of ultrasonic couplant. Because need not be put into the aquatic by the detection part, according to the utility model discloses an ultrasonic testing device is applicable to the circuit components and parts sensitive to water. And in addition, drying operation is not needed after the detection work is finished, so that the time of the detection process is shortened, and the detection efficiency is improved. In addition, online detection of device underfill (underfil) is possible.

Drawings

The above and other aspects, features and benefits of various embodiments of the present invention will become more apparent from the following detailed description, which proceeds with reference to the accompanying figures. In the drawings, like reference numbers or designations refer to like or equivalent elements. The drawings are not necessarily to scale, wherein:

fig. 1 is a schematic view of an ultrasonic testing apparatus according to an embodiment of the present invention;

fig. 2 is a schematic view of the ultrasonic testing apparatus shown in fig. 1 for testing a Printed Circuit Board Assembly PCBA (Printed Circuit Board Assembly).

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without inventive labour, based on the described embodiments of the invention also belong to the scope of protection of the invention.

Fig. 1 is a schematic view of an ultrasonic testing apparatus according to an embodiment of the present invention. As shown in fig. 1, the ultrasonic detection apparatus in the present embodiment includes an ultrasonic transducer 1 and a container 2. The container 2 is for containing an ultrasound couplant and comprises a rigid side wall and a bottom constituted by a flexible membrane 3.

The ultrasonic transducer 1 may be any one of piezoelectric, capacitive, electromagnetic, magnetostrictive, and electrostrictive ultrasonic transducers, and the like. Preferably, a piezoelectric ultrasonic transducer is used, which uses the piezoelectric effect of the material to realize the mutual conversion between the electric energy and the sound energy, i.e. converting the electric signal into the ultrasonic signal or converting the ultrasonic signal into the electric signal. The operating frequency of the ultrasonic transducer 1 is preferably in the range of 1MHz to 500MHz. The lower end of the ultrasonic transducer 1 is preferably provided with an acoustic focusing lens to focus the generated ultrasonic waves on the part to be inspected.

The flexible membrane 3 is preferably made of a known organic polymer material. The organic polymeric material may be a plastic or a rubber. It will be appreciated by those skilled in the art that the material of the flexible membrane 3 is capable of allowing the passage of ultrasound waves generated by the ultrasound transducer 1 and is strong enough to ensure that the flexible membrane 3 does not break when loaded with an ultrasound couplant.

The thickness of the flexible membrane 3 may be set according to the operating frequency of the ultrasound transducer 1. Preferably, the thickness of the flexible film 3 may be set to 1/4 wavelength of the ultrasonic waves generated by the ultrasonic transducer 1. As an example, the thickness of the flexible film 3 may be 0.01mm to 0.1mm. The thinner the thickness of the flexible film 3 is, the higher the degree of adhesion thereof to the surface of the detection target member.

The rigid side walls of the container 2 may be made of any known material. Preferably, the sidewall may be made of a transparent glass or resin material to facilitate observation of the inner state of the container. The side wall may also be made of stainless steel or the like. The shape of the side wall is not particularly limited, and may be generally cylindrical or square, and may have a certain inclination as shown in the drawings.

FIG. 2 is a schematic view of the ultrasonic testing apparatus shown in FIG. 1 being used to test a printed circuit board assembly PCBA.

As shown in fig. 2, in the application of the ultrasonic testing apparatus in this embodiment, an ultrasonic transducer 1 is connected to an ultrasonic analyzer 5 through a lead 4, and a certain amount of ultrasonic couplant 6 is injected into a container 2. The ultrasonic analyzer 5 may be a machine integrating control, analysis, display functions. The ultrasonic coupling agent 6 is preferably water, and other liquids such as ethanol can be used.

The printed circuit board assembly PCBA comprises a PCB7 and components 8 arranged on the PCB. The component 8 may be soldered to the PCB7 by a Surface Mount Technology (SMT) process or the like. In fig. 2, the component 8 and its connection (weld seam) to the PCB7 are shown on an enlarged scale.

In a preparation stage before the start of the inspection work, the container 2 into which the ultrasonic couplant 6 is injected is moved above the inspected member 8 on the PCB7, and the flexible film 3 of the container 2 is made to cover the upper surface of the member 8. Although not shown in the figures, it will be understood by those skilled in the art that the side walls of the container 2 are supported by suitable support structures. Under the action of the gravity of the ultrasonic couplant 6, the flexible film 3 is tightly attached to the upper surface of the component 8. Even if the upper surface of the member 8 is irregular in shape, it is ensured that there is no air gap between the flexible membrane 3 and the upper surface of the member 8.

The ultrasonic analyzer 5 may control the movement of the ultrasonic transducer 1 based on the signal detected by the sensor and start the operation of the ultrasonic transducer 1 after detecting that the ultrasonic transducer 1 is moved in place. The ultrasonic transducer 1 converts the electrical signal into an ultrasonic signal, and the generated ultrasonic wave passes through the ultrasonic couplant 6 and the flexible film 3 and is transmitted to the component 8 and further to the PCB7 if passing through the component 8. If there is a defect such as a crack or a fracture in the PCB7 or if there is a poor bonding (cold or false bonding) between the component 8 and the PCB7, the reflected ultrasonic waveform changes. The ultrasonic transducer 1 receives the reflected ultrasonic waves and converts them into electrical signals, which are transmitted via a lead 4 to an ultrasonic analyzer 5 for analysis. The analysis result can be displayed by the display device of the ultrasonic analyzer 5, whereby information on the size, position, nature, and number of defects can be known.

According to the utility model discloses an ultrasonic testing device need not put into the aquatic by the detection part when using, therefore applicable to the circuit components and parts sensitive to water. And in addition, drying operation is not needed after the detection work is finished, so that the time of the detection process is shortened, and the detection efficiency is improved. In addition, online detection of device underfill is made possible.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements also fall within the scope of the invention.

Claims

1. An ultrasonic testing device adapted for non-destructive testing of a printed circuit board (7) or a component (8) arranged on a printed circuit board (7), characterized in that the ultrasonic testing device comprises an ultrasonic transducer (1) and a container (2) for containing an ultrasonic couplant (6), the container (2) comprising rigid side walls and a bottom constituted by a flexible membrane (3).

2. The ultrasonic testing device according to claim 1, characterized in that said flexible membrane (3) is made of an organic polymer material.

3. The ultrasonic testing device of claim 2, wherein the organic polymeric material is plastic or rubber.

4. The ultrasonic detection device according to any one of claims 1 to 3, characterized in that the thickness of the flexible membrane (3) is set in accordance with the operating frequency of the ultrasonic transducer (1).

5. The ultrasonic testing device according to claim 4, wherein the thickness of the flexible membrane (3) is 0.01mm to 0.1mm.

6. The ultrasonic testing device according to any one of claims 1 to 3, characterized in that the side wall of the container (2) is made of a transparent glass or resin material.

7. The ultrasonic detection device according to any one of claims 1 to 3, characterized in that the ultrasonic transducer (1) is a piezoelectric, capacitive, electromagnetic, magnetostrictive or electrostrictive ultrasonic transducer.

8. The ultrasonic detection device according to any one of claims 1 to 3, characterized in that the lower end of the ultrasonic transducer (1) is provided with an acoustic focusing lens.

9. The ultrasonic detection device according to any one of claims 1 to 3, characterized in that the ultrasonic transducer (1) is connected to an ultrasonic analyzer (5) by a lead wire (4).

10. The ultrasonic testing device according to any one of claims 1 to 3, wherein the ultrasonic couplant (6) is water or ethanol.