CN201774675U - Mini microphone testing device - Google Patents
Mini microphone testing device Download PDFInfo
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- CN201774675U CN201774675U CN2010202548592U CN201020254859U CN201774675U CN 201774675 U CN201774675 U CN 201774675U CN 2010202548592 U CN2010202548592 U CN 2010202548592U CN 201020254859 U CN201020254859 U CN 201020254859U CN 201774675 U CN201774675 U CN 201774675U
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Abstract
The utility model provides a mini microphone testing device, which comprises a testing probe group, a power source, a channel selector switch, a current detecting device and an embedded control unit. The testing probe group includes at least one peripheral probe for being connected with an outer casing of a mini microphone, and a plurality of internal circular probes for being connected with a circuit board of the mini microphone, the channel selector switch is connected with the internal circular probes and used to communicate one of the plurality of the internal circular probes to form a testing loop according to control commands of the embedded control unit, the current detecting device is used for detecting current of the testing loop, and the embedded control unit is used for setting bias voltage, controlling the channel selector switch to communicate the testing loop and analyzing the current of the testing loop. The mini microphone testing device can effectively realize test automation of the mini microphone, and can increase testing efficiency and accuracy.
Description
Technical field
The utility model relates to the microelectronic component technical field of measurement and test, specifically, relates to a kind of mini microphone testing apparatus.
Background technology
In recent years, the mini microphone product progressively is used widely in electronic product, and generally speaking, the mini microphone product can be assembled by automated production, and efficient is than higher.As application number is that 200920027762.5 Chinese patent has just disclosed a kind of mini microphone of being convenient to automated production, but because the product size of mini microphone is less, general all at tens even tens cubic millimeters volume, and the test of traditional mini microphone generally all is a manual test, and therefore this volume has just caused very difficulty of product test.
Fig. 1 is the schematic diagram of the equipment of existing a kind of manual test simulation microphone, as shown in Figure 1, before this equipment of use is simulated the test of microphone, need manually two probes of testing equipment correctly to be communicated to the pad (being used to connect external circuit) of target mini microphone 1, just can test then.But it is well-known, the less size of mini microphone product has determined that manual operation is difficult to test probe is electrically connected on the pad of test microphone well, in this case, very big, the inefficiency of the performance parameter test difficulty of mini microphone product, and be very easy to occur mistake, can't carry out the test of performance parameter exactly to microphone products.
And, mini microphone product comparatively commonly used at present is generally the cylindrical miniature microphone products, mini microphone is used to connect that operated by rotary motion has positive terminal and two pads of negative terminal on the pad of external circuit, the mini microphone product is very easy to slide, thereby has caused the angle of positive terminal and two pads of negative terminal to change easily.Carry out the test of mini microphone if adopt the automatic test means, because the pad locations of mini microphone product is uncertain, just cause the pad that the test probe of testing equipment can not accurate corresponding mini microphone correct polarity easily, be difficult for realizing the automation of test.
Therefore, in order to overcome the mini microphone that exists in the above-mentioned prior art in the problem that exists aspect the test, improving the test feasibility and the accuracy of mini microphone product, is to be badly in need of the major issue that solves in the present mini microphone product industrialization production process.
The utility model content
Based on above problem, the utility model provides a kind of and can be easily the mini microphone product is carried out automatic test, and can improve the mini microphone testing apparatus and the method for testing of testing efficiency and accuracy.
The mini microphone testing apparatus that the utility model provides can carry out polarity identification to a plurality of pads on the mini microphone product, bag test probe group and power supply, wherein,
This testing apparatus also comprises channel selector switch, current sensing means and embedded control unit;
Described test probe group comprises at least one peripheral probe and a plurality of interior ring probe, and described peripheral probe is used for linking to each other with the shell of described mini microphone, and described interior ring probe is used for linking to each other with the wiring board of described mini microphone;
Described channel selector switch with described in the ring probe link to each other, be used for according to the control command of described embedded control unit be communicated with a plurality of in of ring probes with the formation test loop;
Described current sensing means is used to detect the electric current of described test loop;
Described embedded control unit is used to set bias voltage, the described channel selector switch of control and is communicated with test loop and the electric current of described test loop is carried out analyzing and processing.
In addition, preferred construction is that the mini microphone testing apparatus also comprises:
Communication interface is used for the analysis processing result of described embedded control unit is transferred to ancillary equipment.
Moreover preferred construction is that the mini microphone testing apparatus also comprises:
Biasing resistor is connected between described current sensing means and the power supply, is used to mini microphone to be tested that dc point and externally output impedance are provided.
The utility model has overcome is just needing manual searching mini microphone in the existing testing apparatus, the problem that negative terminal is tested, adopt the test probe group, the technology that path selector switch and embedded control unit combine, improve the contact probability of test probe and mini microphone with the test probe group that comprises at least one peripheral probe and a plurality of interior ring probes, realize the automatic switching in loop and the automatic test and the control of contact with path selector switch and embedded control unit, the automation of mini microphone test can be effectively realized, and the efficient and the accuracy of test can be improved.
Description of drawings
By below in conjunction with accompanying drawing embodiment being described, above-mentioned feature of the present utility model and technological merit will become apparent and understand easily.
Fig. 1 is the schematic diagram of the equipment of the existing manual test simulation of expression microphone;
Fig. 2 is the structural representation of expression the utility model microphone testing apparatus embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done further detailed description.
Fig. 2 is the structural representation of expression the utility model microphone testing apparatus embodiment.As shown in Figure 2, the mini microphone testing apparatus that the utility model provides comprises test probe group 201, channel selector switch 202, current sensing means 203, controllable electric power 204, embedded control unit 205 and communication interface 206, and test probe group wherein comprises at least one peripheral probe and a plurality of interior ring probe.
In the utility model, embedded control unit 205 is control cores of whole mini microphone testing apparatus.Before test, the peripheral probe of test probe group 201 contacts with shell, the wiring board of mini microphone 1 respectively with interior ring probe and is connected, embedded control unit 205 sets the bias voltage of controllable electric power 204 earlier, and respectively interior ring probe to be communicated with current sensing means 203 and controllable electric power 204 one by one be a test loop to control channel selector switch 202 then.After test loop is communicated with, be arranged on the current sensing means 203 test loop electric currents in the test loop, and the current value that records fed back to embedded control unit 205, because the loop current difference when bias supply is connected to the diverse location of microphone, therefore, what embedded control unit 205 can judge that this path is whether qualified and this internal terminal connects according to the current in loop characteristic is positive terminal, negative terminal or PCB solder mask layer, and with this judged result via communication interface 206 notice ancillary equipment.
With a kind of testing equipment of testing at the cylindrical simulation microphone of two pads shown in Figure 2 is example, because the testing equipment that the utility model provides adopts the pin scheme of seeking automatically, seek the pin probe groups so the test probe group can be called as again, peripheral probe and interior ring probe are hereinafter referred to as again that the pin probe is sought in the periphery and interior ring is sought the pin probe.In the mini microphone testing apparatus shown in Figure 2, test probe group 201 comprises in two peripheral probes and four encircles probe, in the product test process, earlier configure bias voltage by embedded control unit 205, afterwards the shell of peripheral probe with mini microphone 1 contacted, the shell of mini microphone is that current potential is zero external conductive casing, and a plurality of in addition interior ring probes are electrically connected with the wiring board of mini microphone 1.
If ring probe in each of test probe group 201 is numbered respectively from 1 to n, be electrically connected with the shell of mini microphone to be tested at the peripheral probe of test probe group, interior ring probe is with after the wiring board of mini microphone to be tested is electrically connected, at first embedded control unit 205 is encircled the connection of probe passage in No. 1, the loop current of connecting by No. 1 probe passage of ammeter test then, embedded control unit 205 judges that according to loop current whether qualified this path and by communication interface 206 notice ancillary equipment; Disconnect then and encircle probe in No. 1, connect in No. 2 and encircle probe, repeat above-mentioned testing process, until having detected the loop that all interior ring probes are connected.
In an embodiment of the utility model mini microphone testing apparatus, also comprise the biasing resistor 207 that is connected between current sensing means 203 and the controllable electric power 204, its effect is to provide dc point and externally output impedance for mini microphone, the resistance of biasing resistor 207 is selected and can be determined according to the actual needs of different product, is typically chosen in 2.2K Ω or 680 Ω.For the mini microphone that adopts J-FET, biasing resistor is necessary; And for the mini microphone that adopts discharge circuit, some are arranged is not need biasing resistor.
The utility model is by above-mentioned test mode, can search out the positive pole of mini microphone by ring probe in a plurality of automatically, detect the static working current that obtains mini microphone, and keep the connection pattern, after waiting for that other audio-frequency test projects finish, disconnect the connection of mini microphone again.
Applied principle is as follows in the utility model:
When the bias supply that is provided by controllable electric power is connected to the diverse location (positive terminal, negative terminal, PCB solder mask layer, shell) of mini microphone, the current in loop difference, utilize this characteristic, the probe that is electrically connected on the mini microphone positive terminal can be identified.For example: be electrically connected to the probe path of positive terminal, electric current is
Receive the probe path of negative terminal, electric current is
Receive the probe path on the PCB solder mask layer, electric current is 0.According to these contact conditions, current value than big-difference, the contact condition of probe can be identified, thus selected correct probe path.
In a preferred implementation of the present utility model, peripheral probe in order to ensure contact mini microphone shell can be realized good being electrically connected with the shell of mini microphone, four on ring is sought and is had a positive terminal that can touch microphone in the pin probe at least in guaranteeing, the setting of interior ring probe is many more, intensive more, the contact back realizes that the reliability that is electrically connected is high more, and the effect of detection is good more.But can improve the difficulty and the cost of manufacture of mini microphone testing apparatus design thus, therefore, mini microphone testing apparatus middle probe arrange and number needs will be set flexibly according to the overall dimension of actual test products.Such as, suppose the mini microphone wiring board for circular, the positive terminal on the PCB surface is shaped as the fan-shaped of 1/4th circles, and fan-shaped positive electrode and circular wiring board are concentric, so the quantity of probe can for four, be square profile; If the mini microphone wiring board is circular again, the positive terminal on the PCB surface is shaped as the fan-shaped of 1/8th circles, and fan-shaped positive electrode and circular wiring board are concentric, so the quantity of probe can for eight, be octagon and distribute.In a word, need guarantee in ring seek and have a positive terminal that can touch mini microphone in the pin probe at least.
In addition, good at the contact under the opening state in order to ensure channel selector switch, the internal resistance of mini microphone testing apparatus is the smaller the better.If the internal resistance of mini microphone testing apparatus is bigger, then this internal resistance meeting equivalence in the loop is the part of biasing resistor, thereby has influence on the accuracy of test data.
Channel selector switch can adopt relay switch or analogue relay chip to constitute.
The test specification of ammeter and measuring accuracy need be decided according to the characteristic of actual mini microphone product to be tested, and the stability boundary of ammeter is set in 2 μ A between the 500mA, and precision is 2 μ A.
The voltage regulation accuracy of controllable electric power also will be according to the requirement design of mini microphone product to be tested.For example, if the operating voltage range of product requirement is 2V ± 0.1V, the supply voltage degree of regulation just need satisfy at 0.05V so.
In the utility model, the bus interface modes that the communication interface dependability is high, be preferably Industry Control commonly used as buses such as RS-232, RS-485, GPIB, CAN.
Under above-mentioned instruction of the present utility model; those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description; and these improvement and distortion; all drop in the protection range of the present utility model; those skilled in the art should be understood that; above-mentioned specific descriptions are just better explained the purpose of this utility model, and protection range of the present utility model is limited by claim and equivalent thereof.
Claims (10)
1. a mini microphone testing apparatus comprises test probe group and power supply, it is characterized in that,
This testing apparatus also comprises channel selector switch, current sensing means and embedded control unit;
Described test probe group comprises at least one peripheral probe and a plurality of interior ring probe, and described peripheral probe is used for linking to each other with the shell of described mini microphone, and described interior ring probe is used for linking to each other with the wiring board of described mini microphone;
Described channel selector switch with described in the ring probe link to each other, be used for according to the control command of described embedded control unit be communicated with a plurality of in of ring probes with the formation test loop;
Described current sensing means is used to detect the electric current of described test loop;
Described embedded control unit is used to set bias voltage, the described channel selector switch of control and is communicated with test loop and the electric current of described test loop is carried out analyzing and processing.
2. according to the described mini microphone testing apparatus of claim 1, it is characterized in that, also comprise:
Communication interface is used for the analysis processing result of described embedded control unit is transferred to ancillary equipment.
3. according to the described mini microphone testing apparatus of claim 2, it is characterized in that, also comprise:
Biasing resistor is connected between described current sensing means and the power supply, is used to mini microphone to be tested that dc point and externally output impedance are provided.
4. according to claim 2 or 3 described mini microphone testing apparatuss, it is characterized in that,
Positive terminal, negative terminal and PCB solder mask layer in described on the wiring board of ring probe and described mini microphone respectively link to each other.
5. according to the described mini microphone testing apparatus of claim 4, it is characterized in that,
Described test probe group comprises in two peripheral probes and four encircles probe.
6. according to the described mini microphone testing apparatus of claim 5, it is characterized in that,
Described power supply is a controllable electric power, and being used for provides bias voltage according to the described test loop of being controlled to be of described embedded control unit.
7. according to the described mini microphone testing apparatus of claim 6, it is characterized in that, when loop current is
The time, described in positive terminal on the wiring board of ring probe and described mini microphone be electrically connected;
When loop current is
The time, described in negative terminal on the wiring board of ring probe and described mini microphone be electrically connected;
When loop current is 0, described in PCB solder mask layer on the wiring board of ring probe and described mini microphone be electrically connected.
8. according to the described mini microphone testing apparatus of claim 7, it is characterized in that,
Described channel selector switch adopts relay switch or analogue relay chip.
9. according to the described mini microphone testing apparatus of claim 8, it is characterized in that,
The stability boundary of described current sensing means be 2 μ A to 500mA, precision is 2 μ A.
10. according to the described mini microphone testing apparatus of claim 9, it is characterized in that,
Described communication interface adopts RS-232, RS-485, GPIB or CAN bus interface modes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202548592U CN201774675U (en) | 2010-07-12 | 2010-07-12 | Mini microphone testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202548592U CN201774675U (en) | 2010-07-12 | 2010-07-12 | Mini microphone testing device |
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| CN201774675U true CN201774675U (en) | 2011-03-23 |
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| CN2010202548592U Expired - Lifetime CN201774675U (en) | 2010-07-12 | 2010-07-12 | Mini microphone testing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333273A (en) * | 2010-07-12 | 2012-01-25 | 歌尔声学股份有限公司 | Miniature microphone testing device |
| CN102395095A (en) * | 2011-12-06 | 2012-03-28 | 歌尔声学股份有限公司 | Test method of omnidirectional microphone and test equipment thereof |
| CN103888885A (en) * | 2014-04-09 | 2014-06-25 | 歌尔声学股份有限公司 | Miniature microphone capacitance test method |
| CN104717596A (en) * | 2015-03-23 | 2015-06-17 | 惠州Tcl移动通信有限公司 | Microphone audio testing system and method |
| CN110602623A (en) * | 2019-08-28 | 2019-12-20 | 歌尔股份有限公司 | Device and method for testing acoustic performance based on multi-channel microphone |
-
2010
- 2010-07-12 CN CN2010202548592U patent/CN201774675U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333273A (en) * | 2010-07-12 | 2012-01-25 | 歌尔声学股份有限公司 | Miniature microphone testing device |
| CN102395095A (en) * | 2011-12-06 | 2012-03-28 | 歌尔声学股份有限公司 | Test method of omnidirectional microphone and test equipment thereof |
| CN103888885A (en) * | 2014-04-09 | 2014-06-25 | 歌尔声学股份有限公司 | Miniature microphone capacitance test method |
| CN103888885B (en) * | 2014-04-09 | 2017-01-25 | 歌尔股份有限公司 | Miniature microphone capacitance test method |
| CN104717596A (en) * | 2015-03-23 | 2015-06-17 | 惠州Tcl移动通信有限公司 | Microphone audio testing system and method |
| CN110602623A (en) * | 2019-08-28 | 2019-12-20 | 歌尔股份有限公司 | Device and method for testing acoustic performance based on multi-channel microphone |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee after: Goertek Inc. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: Goertek Inc. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110323 |