CN202135323U

CN202135323U - Diaphragm test device

Info

Publication number: CN202135323U
Application number: CN201020642886U
Authority: CN
Inventors: 贺志坚; 郑虎鸣; 温增丰
Original assignee: Transound Electronics Co Ltd
Current assignee: Transound Electronics Co Ltd
Priority date: 2010-12-06
Filing date: 2010-12-06
Publication date: 2012-02-01
Anticipated expiration: 2020-12-06

Abstract

The utility model provides a diaphragm test device, used for testing resonant frequency of a vibrating diaphragm of a sound and electricity energy transducer member. The diaphragm test device mainly comprises a general PC apparatus, an input and output interface plate apparatus, an acoustics excitation generator and a standard microphone. Because the test device uses the general PC apparatus and the input and output interface plate apparatus, and compiles a professional test program software to form a special-purpose PC virtual test apparatus, a resonant frequency test on a miniature diaphragm is realized. The PC virtual test apparatus, compared with the special-purpose test apparatus of the conventional sound and electricity energy transducer diaphragm, has the excellent performances of simple and agile combination, low cost, strong versatility, and visual and accurate test result.

Description

The Membrane probing device

Technical field

The utility model relates to a kind of testing apparatus, especially relates to a kind of special-purpose Membrane probing device that is used for testing acoustics research and development, production field about acoustics diaphragm resonance frequency.

Background technology

Since at current ECM (electret capacitor microphone) research and development, production field for ECM important composition element--the test data of this important parameters,acoustic of resonance frequency of vibrating diaphragm finished product; Can directly influence the frequency response curve and the sensitivity index of ECM product, have direct impact effect for the research and development performance and the production yields of ECM product.

Present stage, industry was for the resonance frequency method of testing of ECM diaphragm; Mainly take in the plated film stage; The macromolecule membrane of desired thickness is clamped on the bigger zona tool that stretches tight, the mode through high temperature evaporation in vacuum coating equipment, with the evaporation of metal materials such as nickel, gold attached to forming on the macromolecule diaphragm after the required coat of metal; Adopt a simple acoustic resonance device (like Fig. 1) through regulating the frequency adjustment knob of audio signal generator 12 manually; Export one group of continuous audio signal, drive a heavy caliber woofer 15, above loud speaker, place the zona 14 that stretches tight that has plated diaphragm; ECM microphone 13 that sensitivity is higher, frequency response is more straight of zona 14 tops placement stretches tight; Under the excitation of woofer 15 acoustic signals, the diaphragm on the zona 14 that stretches tight can be maximum at its natural resonance frequency point Oscillation Amplitude, and the ECM microphone 13 of diaphragm top can be exported the peak value of an alternating voltage at this moment; Through the corresponding Frequency point in peak value place of monitoring ac millivoltmeter 11 pointers indication, can test out the resonant frequency point of zona 14 upper diaphragms that stretch tight.Obtain the big diaphragm that required resonance frequency requires according to aforesaid way, and then on big diaphragm the bonding needed Small diaphragm-piece zona that stretches tight, obtain the needed vibrating diaphragm of ECM product through the technology of drawing film.

The present used manual Membrane probing device as shown in Figure 1 of industry; For commonly using the Membrane probing device; Because this apparatus structure is simple, sensitivity is low, poor accuracy; Can only test the resonance frequency of big diaphragm on the zona tool that stretches tight in plated film stage, be accurately to test commonly using on the device at this through the resonance frequency of the Small diaphragm-piece after drawing membrane process, so can only estimate the high low range of Small diaphragm-piece through the resonance frequency of the big diaphragm of adjustment at present; The accurate resonant frequency point that tests out Small diaphragm-piece that can't be accurately quantitative improves and improves thereby influence the ECM performance of products.

Therefore; How to be directed against the above-mentioned weak point of commonly using diaphragm resonance frequency testing apparatus; And can satisfy ECM research and development, produce neededly, the demand of product Small diaphragm-piece resonance frequency test is proposed a kind of novel solution, become a problem that needs to be resolved hurrily.

The utility model content

The utility model is to the defective that the above-mentioned background technology exists a kind of Membrane probing device to be provided, the combination simple and flexible, and cost is low, highly versatile, test result is intuitively accurate.

For realizing above-mentioned purpose, the utility model discloses a kind of Membrane probing device, it comprises a universal PC device; One input/output interface hardware unit links to each other with said universal PC device; One acoustic excitation device links to each other with said input/output interface hardware unit and as the excitation sound source of vibrating diaphragm; One receiving system links to each other with said input/output interface hardware unit, and is used to detect output signal and the amplitude wave-shape that diaphragm produces resonant frequency point.

Further, said receiving system is a standard microphone.

Further, said acoustic excitation device is the acoustic excitation generator.

Further, said input/output interface hardware unit is input, output interface panel assembly.

In sum, the utility model Membrane probing device is through utilizing universal PC and input/output interface board, and consists of special-purpose PC virtual test instrument through the professional test program software of establishment; Realization is tested small-sized diaphragm resonance frequency; This PC virtual test instrument is compared with traditional acoustic-electrical transducer diaphragm special test equipment, has the combination simple and flexible, and cost is low; Highly versatile, test result visual and accurate excellent in performance.

Description of drawings

Fig. 1 is the existing zona diaphragm resonance frequency testing apparatus theory diagram that stretches tight.

Fig. 2 is the theory diagram of the utility model Membrane probing device one preferred embodiment.

Fig. 3 is the test flow chart of the utility model Membrane probing device shown in Figure 2.

Fig. 4 is the test output frequency response curve figure of the utility model Membrane probing device shown in Figure 2.

Embodiment

For letting purpose, characteristic and the advantage of the utility model can be more obviously understandable, hereinafter is special lifts a preferred embodiment, and conjunction with figs., elaborates as follows:

See also Fig. 2 and Fig. 3, it is the theory diagram and the test flow chart thereof of 20 1 preferred embodiments of the utility model Membrane probing device; As shown in the figure, said Membrane probing device 20 includes a universal PC device 21, and this universal PC device 21 is connected with the input/output interface device, and in the present embodiment, said input/output interface device is special test input, output interface panel assembly 23.Test dedicated program software 22 is housed in the said universal PC device 21, and this dedicated program software 22 outputs test result in order to unified management, the whole test processs of control and processing.

Said special test input, output interface panel assembly 23 are connected with acoustic excitation generator 26 and standard microphone 24; When the vibrating diaphragm that will test 25 places between acoustic excitation generator 26 and the standard microphone 24, start the test program in the PC device 21, can carry out the test of natural resonance frequency to the vibrating diaphragm 25 of required test.

The method of testing of said Membrane probing device 20 comprises the steps:

At first; Step 1 S310, send white noise signal: promptly according to the flow process of test to encouraging sound source generator 26; Start the test program of dedicated program software 22; Test program can synthesize to produce tests required white noise signal, drives acoustic excitation generators 26 through input, output test interface panel assembly 23.

Step 2 S320, testing standard microphone 24 receive the acoustic pressure change information of tested diaphragm 25; And be converted into the noise electronic signal and be sent to the universal PC device: promptly under the excitation of white noise signal drives; Tested diaphragm 25 can produce bigger Oscillation Amplitude at natural resonance frequency point; Thereby output is acoustic pressure significantly; Testing standard microphone 24 receptions that the acoustic pressure variation meeting quilt that tested diaphragm 25 produces at natural resonance frequency point is connected with input, output test interface panel assembly 23 also convert the noise electronic signal into, said noise electronic signal through said special test import, output interface panel assembly 23 is sent to universal PC device 21.

Step 3 S330, CPU carry out the computing of FFT conversion process to said noise electronic signal; Thereby obtain the frequency response curve data of tested diaphragm: i.e. processing in dedicated program software 22 test programs receives the subprogram of signal can carry out FFT conversion (Fourier changes fast) to the noisy test signal of receiving, thereby obtains the frequency response curve data of tested diaphragm.

Step 4 S340, said frequency response curve data are turned to test parameter and graphical display interface: i.e. the frequency response curve shape (as shown in Figure 4) that can the frequency response curve data conversion that the FFT calculation process obtains can intuitively be read for the PC display of test subroutine, so that operating personnel read.Step 5 S350, judge through software program whether qualified: promptly according to the frequency response curve data of tested diaphragm 25; The test subroutine of dedicated program software 22 can whether qualified with being stored in qualified data in the test program in advance if comparing judgement with these data, the qualified S361 of result of determination or defective S362 shown with the PC screen simultaneously supply operating personnel to judge " YES ", " NG " fast.

So, utilize this uniqueness of the utility model, accurate test macro framework, get final product the resonant frequency point of required product vibrating diaphragm in Validity Test ECM research and development, the production, and reach the purpose of effective raising research and development progress and control of product quality.

In sum, the utility model relates to a kind of testing apparatus that is implemented on test by the microphone vibrating diaphragm resonance frequency of macromolecule membrane making, can only utilize a universal PC to be equipped with the test plan software of specialty establishment; And be equipped with a small amount of supporting testing apparatus; Can accurately test the resonant frequency point of the vibrating diaphragm of various sizes, reach the test effect of expection, compare with traditional acoustic-electrical transducer diaphragm special test equipment; Has the combination simple and flexible; Cost is low, highly versatile, test result visual and accurate excellent in performance.

The above embodiment has only expressed a kind of execution mode of the utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model scope.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to the protection range of the utility model.Therefore, the protection range of the utility model should be as the criterion with accompanying claims.

Claims

1. Membrane probing device, the resonant frequency response point in order to test acoustics diaphragm is characterized in that including:

One universal PC device;

One input/output interface hardware unit links to each other with said universal PC device;

One acoustic excitation device links to each other with said input/output interface hardware unit and as the excitation sound source of vibrating diaphragm;

One receiving system links to each other with said input/output interface hardware unit, and is used to detect output signal and the amplitude wave-shape that diaphragm produces resonant frequency point.

2. testing apparatus according to claim 1 is characterized in that: said receiving system is a standard microphone.

3 .Testing apparatus according to claim 1 and 2 is characterized in that: said acoustic excitation device is the acoustic excitation generator.

4 .Testing apparatus according to claim 1 and 2 is characterized in that: said input/output interface hardware unit is input, output interface panel assembly.