CN209882096U

CN209882096U - Testing device

Info

Publication number: CN209882096U
Application number: CN201920836898.4U
Authority: CN
Inventors: 张绍年; 罗小虎
Original assignee: Dongguan Rui Qin Electronics Co Ltd
Current assignee: Dongguan Rui Qin Electronics Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2019-12-31
Anticipated expiration: 2029-06-03

Abstract

The utility model discloses a testing arrangement for whether test silicon microphone leaks gas with screening silicon microphone, include: the silicon microphone sealing device comprises a sealing device provided with an opening, a sound source loudspeaker arranged in the sealing device, an electric connection port arranged at the opening of the sealing device and used for being connected with a silicon microphone, a closed cavity arranged at the opening of the sealing device and used for containing and closing the silicon microphone, an air blowing pipe communicated with the closed cavity, and an external loudspeaker communicated with the closed cavity. The utility model discloses, through setting up the external loudspeaker with the closed chamber intercommunication, can improve the precision of gas leakage test, even if the gap of the gas leakage of silicon microphone is very small, also can be after having increased a reverse sound signal through external loudspeaker, the test is judged.

Description

Testing device

Technical Field

The utility model relates to a silicon microphone technical field, concretely relates to testing arrangement.

Background

A silicon microphone, i.e., an MEMS (micro electro mechanical systems) microphone, is an electric transducer manufactured by a micromachining technology, and has the characteristics of small volume, good frequency response, low noise, and the like. With the development of miniaturization and thinning of electronic devices, MEMS microphones are increasingly widely used for these devices.

The silicon microphone generally includes a PCB (printed circuit board), a case, a MEMS chip, an ASIC (application specific integrated circuit) chip, and other components, wherein the PCB and the case enclose a housing space, and the MEMS chip and the ASIC chip are housed in the housing space.

Referring to fig. 1, a conventional testing apparatus for a silicon microphone generally includes a sound source 11 (a horn), a sealing device 12 (a sealing fixture for isolating the horn from the silicon microphone to be tested), a test electrical connection port 13, a pressing block 14 for pressing the silicon microphone and the electrical connection port together, and a jig 10 for fixing the horn 11, the sealing device 12, the electrical connection port 13, the pressing block 14, and the silicon microphone 40 to be tested together. The test device can test most of the performance of the silicon microphone.

However, the silicon microphone may have a gap between the housing and the PCB due to a package defect, and the existence of the gap may cause external sound and air flow to enter the silicon microphone, thereby degrading the performance of the silicon microphone. Therefore, it is necessary to test whether the silicon microphone is air-leaking.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a testing arrangement for whether test silicon microphone leaks gas with screening silicon microphone.

In order to solve the technical problems, the technical scheme is as follows:

a test apparatus for testing a silicon microphone and screening the silicon microphone for air leakage, comprising: the silicon microphone sealing device comprises a sealing device provided with an opening, a sound source loudspeaker arranged in the sealing device, an electric connection port arranged at the opening of the sealing device and used for being connected with a silicon microphone, a closed cavity arranged at the opening of the sealing device and used for containing and closing the silicon microphone, an air blowing pipe communicated with the closed cavity, and an external loudspeaker communicated with the closed cavity.

Optionally, the external horn is disposed in an accommodating chamber, and the accommodating chamber is communicated with the closed chamber through a pipeline.

Optionally, the accommodating cavity is communicated with the closed cavity through the air blowing pipe.

Optionally, a press block for pressing the silicon microphone against the electrical connection port is further included.

Optionally, a clamp is included that secures the sealing device, the electrical connection port, the silicon microphone to be tested, and the closed chamber together.

Optionally, the closed cavity is formed on the clamp and is of an integral structure with the clamp.

According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:

the utility model can blow air into the sealed cavity in the testing process by arranging the sealed cavity of the sealed silicon microphone and the air blowing pipe, thereby realizing the testing of whether the silicon microphone leaks air or not; and furthermore, the external loudspeaker communicated with the closed cavity is arranged, so that the air leakage test precision can be improved, and even if the air leakage gap of the silicon microphone is very small, the test judgment can be carried out after a reverse sound signal is added through the external loudspeaker.

Drawings

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

FIG. 1 is a block diagram of a conventional test apparatus;

fig. 2 is a structural diagram of a testing apparatus for increasing a leakage testing function according to an embodiment of the present invention;

fig. 3 is a structural diagram of a further improved testing device according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

The terms "first," "second," "third," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The following are detailed descriptions of the respective embodiments.

Referring to fig. 2, an embodiment of the present invention provides a testing apparatus for testing a silicon microphone and screening the silicon microphone for air leakage.

The test device includes: the testing device comprises a sound source loudspeaker 21, a sealing device 22 (sealing tooling for isolating the sound source loudspeaker from a microphone to be tested), a testing electric connection port 23, a pressing block 24 for pressing the silicon microphone to be tested and the electric connection port 23 together, and a clamp 20 for fixing the sound source loudspeaker 21, the sealing device 22, the electric connection port 23, the pressing block 24 and the microphone to be tested together. In order to increase functions and realize the test of air leakage of the silicon microphone, a sealing cavity 25 for sealing the silicon microphone and an air blowing pipe 26 communicated with the sealing cavity 25 are additionally arranged.

Alternatively, the fixture 20 for fixing may be upgraded on the basis of a conventional testing device to a fixture 20 with a closed cavity 25, i.e. the closed cavity 25 is formed on the fixture 20 and is integrated with the fixture 20.

Wherein, the upper end of the sealing device 22 is provided with an opening, the electric connection port 23 is arranged at the opening, the silicon microphone is placed above the opening and is electrically connected with the electric connection port 23, the pressing block 24 is pressed above the silicon microphone to tightly press the silicon microphone at the opening, so that the opening is sealed as far as possible without air leakage, and the silicon microphone 40 is positioned in the sealed cavity 25.

When the test is carried out, the sound source loudspeaker 21 emits a sound signal, the silicon microphone receives the sound signal and converts the sound signal into a corresponding electric signal, the corresponding electric signal is transmitted out through the electric connection port 23, the electric signal is finally transmitted to the analysis processing device at the rear end to be used for generating a sensitivity, a frequency response curve or other test results, and the test results reflect the performance of the silicon microphone.

When air leakage needs to be tested, air flow is blown into the closed cavity 25 through the air blowing pipe 26, the blown air flow acts on the silicon microphone to be tested, and if a gap exists between the PCB and the shell of the silicon microphone, the air flow enters the silicon microphone, so that the performance of the silicon microphone, such as the sensitivity and the frequency response curve, is influenced. Thus, through sensitivity, frequency response curve or other test results, whether the silicon microphone leaks air or not can be judged.

However, it has been found that the accuracy of testing for air leakage is not high enough in the testing device provided in the embodiment of fig. 2.

The reason for the analysis is that: if only a very small gap exists between the shell of the silicon microphone and the PCB, the pressure block can apply about 2N force to the shell of the silicon microphone during testing, so that the PCB is slightly deformed, and finally the gap is reduced.

In order to solve the above problems, the present invention also provides an improved embodiment.

Referring to fig. 3, an embodiment of the present invention provides a testing apparatus for testing a silicon microphone and screening the silicon microphone for air leakage, the testing apparatus comprising:

the silicon microphone comprises a sealing device 31 provided with an opening, a sound source loudspeaker 32 arranged in the sealing device, an electric connection port 33 arranged at the opening of the sealing device and used for being connected with a silicon microphone 40, a closed cavity 34 arranged at the opening of the sealing device and used for containing and closing the silicon microphone, an air blowing pipe 35 communicated with the closed cavity, and an external loudspeaker 36 communicated with the closed cavity 34.

Optionally, the external speaker 36 is disposed in a receiving cavity 37, and the receiving cavity 37 is communicated with the closed cavity 34 through a pipeline.

Optionally, the accommodating cavity 37 and the closed cavity 34 are communicated through the blowing pipe 35, that is, a common pipe is used for transmitting sound signals and blowing airflow. In other embodiments, the receiving chamber 37 communicates with the closed chamber 34 via another conduit, such as a hose, and the sound signal and the insufflation gas flow are respectively transmitted via different conduits.

Optionally, the test apparatus further comprises a press block 38 for pressing the silicon microphone against the electrical connection port 33.

Optionally, the test apparatus further comprises a clamp 30, the clamp 30 securing together the sealing means, the electrical connection port, the silicon microphone to be tested and the closed chamber.

Optionally, the closed cavity 34 is formed on the clamp 30 and is of an integral structure with the clamp 30.

As described above, the test apparatus may include: the silicon microphone testing device comprises a sound source loudspeaker, a sealing device (sealing tool for isolating the sound source loudspeaker from a silicon microphone to be tested), a testing electric connection port, a pressing block for pressing the silicon microphone and the electric connection port together, an external loudspeaker, a hose (air blowing pipe) capable of conducting a sound signal (1KHz pure sound) sent by the external loudspeaker to the upper part of the silicon microphone, and a clamp for fixing the sound source loudspeaker, the sealing device, the electric connection port, the pressing block, the sound guiding hose and the microphone to be tested together.

The use mode can be as follows: firstly, opening a sound source loudspeaker, and normally testing the electroacoustic performance of a product; after the test is finished, the second external loudspeaker with the air pipe is opened, the first sound source loudspeaker is closed, if the microphone detects that 1KHz sound signals are obtained, the silicon microphone is air-leakage, and otherwise, the silicon microphone is air-leakage.

The advantages are that: even a slight gap can be determined after adding an inverted 1KHz tone signal through the external horn.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A test apparatus for testing a silicon microphone and screening the silicon microphone for air leakage, comprising:

the silicon microphone sealing device comprises a sealing device provided with an opening, a sound source loudspeaker arranged in the sealing device, an electric connection port arranged at the opening of the sealing device and used for being connected with a silicon microphone, a closed cavity arranged at the opening of the sealing device and used for containing and closing the silicon microphone, an air blowing pipe communicated with the closed cavity, and an external loudspeaker communicated with the closed cavity.

2. The test device of claim 1,

the external loudspeaker sets up in an accommodation intracavity, the accommodation chamber with the closed chamber passes through the pipeline intercommunication.

3. The test device of claim 2,

the accommodating cavity is communicated with the closed cavity through the air blowing pipe.

4. The test device of claim 1,

a press block for pressing the silicon microphone against the electrical connection port is also included.

5. The test device according to any one of claims 1 to 4,

the test fixture further comprises a clamp which fixes the sealing device, the electric connection port, the silicon microphone to be tested and the closed cavity together.

6. The test device of claim 5,

the closed cavity is formed on the clamp and is of an integral structure with the clamp.