CN202255770U - Testing tooling and testing system for air tightness of loudspeaker module - Google Patents
Testing tooling and testing system for air tightness of loudspeaker module Download PDFInfo
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- CN202255770U CN202255770U CN2011202895215U CN201120289521U CN202255770U CN 202255770 U CN202255770 U CN 202255770U CN 2011202895215 U CN2011202895215 U CN 2011202895215U CN 201120289521 U CN201120289521 U CN 201120289521U CN 202255770 U CN202255770 U CN 202255770U
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Abstract
The utility model provides a testing tooling and a testing system for air tightness of a loudspeaker module, wherein the testing tooling comprises a closed sound box system used for providing a closed sound field for the to-be-tested loudspeaker module, and a box body seal tooling used for sealing the to-be-tested loudspeaker module in the closed sound box system, wherein the closed sound box system includes a loudspeaker unit used for providing a testing sound source, and further includes a front cavity and a rear cavity that are working in cooperation with the loudspeaker unit; The testing tooling and the testing system have simple structures, and are convenient to operate; when the standard criterion is confirmed, and as long as the to-be-tested loudspeaker module is arranged in the sound field of the closed sound box system, the air tightness of the loudspeaker module can be determined quickly objectively, and the testing result is more accurate and quantitative.
Description
Technical field
The utility model relates to the loudspeaker technical field of measurement and test, more particularly, relates to a kind of loudspeaker module air tightness test frock and test macro.
Background technology
Along with the continuous increase in electronic product market and improving constantly of product integrated level such as mobile phone, notebook, ultra-thin televisions, when the demand to the loudspeaker module constantly increases, the performance of loudspeaker module is also had higher requirement.
Known, the casing of the loudspeaker module of conventional structure is generally surrounded through combinations such as gluing or ultra-sonic welded by a upper casing and a lower casing jointly, and upper casing is fixedly connected one or several loudspeaker monomers through mode such as gluing.The transducing type of the loudspeaker monomer that uses is generally moving-coil type, also can adopt the loudspeaker monomer of piezoelectric type, electrostatic or other known transducing modes as required; Module casing type is generally closed, also can be designed to inverted phase type, 4 rank band general formulas, 6 rank band general formulas or other known casing types as required.In addition, also may additional antenna on the loudspeaker module etc. other assemblies to realize its desired other performances.
The loudspeaker module of this conventional structure; In actual production process, generally all can there be sealing problem; The reason of promptly bad because of combination technologies such as gluing or ultra-sonic welded or misoperation makes on module casing, to form slit or other forms of poorly sealed zone.
The poorly sealed acoustics harm that causes mainly contains two aspects on the loudspeaker module casing: on the one hand; The acoustic energy of radiation is outside to casing through the poorly sealed area radiation on the module casing in the module casing; Cause sound leakage; The low-frequency sensitive degree of module is reduced, particularly form resonance structure, can cause bigger infringement the performances such as frequency response of product when the module casing is communicated with through interior other structures of poorly sealed zone and complete machine; On the other hand, under the driving of loudspeaker acting force, the last lower casing around the slit can vibrate aggravation and collision and produce noise each other, and air-flow noise such as generation airflow noise through the slit time, thereby influences the audition of module.Especially usually detection mode be difficult for realizing than small gaps, after the module installation, the acting force that during through speaker operation housing is produced continues to drive down, the originally poorly sealed slit that causes can constantly become greatly, thereby the acoustical behavior that makes complete machine variation gradually.Sell long after and just slowly display because the bad symptom of this performance is a product, so just bring very big puzzlement, also influenced the reputation of manufacturer to the consumer.
Aspect the air tightness test of loudspeaker; Current common way is through wet lip test; Make loudspeaker (be generally near the frequency the resonance frequency at (like 0.5W) radiation frequency sweep sound or single-frequency sound under certain power; Like 600Hz), whether the tester comes the inductive module surface with skin of lip to the more sensitive characteristic of air-flow, survey sound leakage and exist.This mode can more effectively be surveyed the sound leakage of loudspeaker module.But this method need be carried out the training of long period to lip survey personnel usually, and is difficult to avoid erroneous judgement, particularly when lip is surveyed personnel's fatigue.The method is a subjective testing, mainly relies on tester's experience, is difficult to be applied among the large-scale production.
The utility model content
In view of the above problems, the purpose of the utility model provides a kind of bubble-tight test fixture, test macro of objective and accurate loudspeaker module.
According to an aspect of the utility model, a kind of loudspeaker module air tightness test frock is provided, comprising:
The closed sound box system, comprise loudspeaker unit that measuring sound source is provided and with the ante-chamber and the back cavity of said loudspeaker unit cooperating, be used to loudspeaker module to be tested airtight sound field be provided;
The box sealing frock is used for said loudspeaker module to be tested is sealed in said closed sound box system.
In addition, preferred scheme is in the ante-chamber of said audio amplifier closed sound box system, to be provided with the network that is used to support said sound source to be tested.
In addition, preferred scheme is that said network is fixed on the preceding cavity wall of said closed sound box system through buffer rubber gasket.
Moreover preferably scheme is, said box sealing frock comprises support, jacking gear, stationary installation and gland bonnet, wherein,
Said jacking gear is arranged on the said support, moves in vertical direction along guide rail;
Stationary installation is arranged on the said jacking gear, and is fixedly connected with said gland bonnet, is used for when said jacking gear moves up and down, driving said gland bonnet closure or openness;
Said gland bonnet seals the ante-chamber of said closed sound box system through said stationary installation.
In addition, preferred scheme is to be provided with the sealing strip that rubber ring or compressible material constitute in the ante-chamber sealing contact position of said gland bonnet and said closed sound box system.
In addition, preferred scheme is, the span of the frequency of said airtight sound field is 10Hz～100Hz, and the span of sound pressure level is 100dBSPL～140dBSPL.
According to the utility model on the other hand, a kind of loudspeaker module tightness test system is provided, has comprised audio analyzer, power amplifier, measuring amplifier and above-mentioned loudspeaker module air tightness test frock, wherein,
Said power amplifier is arranged between the input end of output terminal and said closed sound box system of said audio analyzer, is used for the loudspeaker unit that frequency signal to said audio analyzer output carries out flowing to after the power amplification said closed sound box system;
Said measuring amplifier is arranged between the input end of output terminal and said audio analyzer of said closed sound box system, is used for the amplification that gains of Sensitirity va1ue to the loudspeaker module output to be tested that is sealed in said closed sound box system;
Said audio analyzer is used to the frequency signal that preset frequency point is provided of said closed sound box system or the swept-frequency signal of scheduled frequency range; And obtain the Sensitirity va1ue that said measuring amplifier is exported, and confirm according to said Sensitirity va1ue whether the impermeability of said loudspeaker module to be tested is qualified.
In addition; Preferred scheme is; Said audio analyzer comprises data processing unit; Said data processing unit according to said loudspeaker module to be tested at the Sensitirity va1ue of preset frequency point or in the sensitivity difference of different preset frequency points, through with normal sensibility the criterion of said preset frequency point or compare in the difference criterion of said different preset frequency points whether qualified with the impermeability of judging said loudspeaker module to be tested.
In addition; Preferred scheme is; Said measuring amplifier is a plurality of; Be separately positioned between the input end of output terminal and said audio analyzer of said closed sound box system, be used for the amplification that gains of Sensitirity va1ue to the loudspeaker module output a plurality of to be tested that is sealed in said closed sound box system.
In addition, preferably scheme is, the span of the frequency of the sound field in the said closed sound box system is 10Hz～100Hz, and the value of sound pressure level is 100dBSPL～140dBSPL.
Be compared to prior art, utilize the loudspeaker module air tightness test device of the utility model, can carry out objective fast judgement to the impermeability of loudspeaker module is whether qualified, test result is more accurate and quantize.
In order to realize above-mentioned and relevant purpose, one or more aspects of the utility model comprise the characteristic that the back will specify and in claim, particularly point out.Some illustrative aspects that following explanation and accompanying drawing have specified the utility model.Yet, the indication of these aspects only be some modes that can use in the variety of way of principle of the utility model.In addition, the utility model is intended to comprise all these aspects and their equivalent.
Description of drawings
Through with reference to below in conjunction with the explanation of accompanying drawing and the content of claims, and along with the more complete understanding to the utility model, other purpose of the utility model and result will understand more and reach easy to understand.In the accompanying drawings:
Fig. 1 is the external view of the loudspeaker module air tightness test device that relates to of the utility model embodiment;
Fig. 2 is the sectional view of the loudspeaker module air tightness test device that relates to of the utility model embodiment;
Fig. 3 is according to the loudspeaker module air tightness test schematic flow sheet of the utility model;
Fig. 4 is the loudspeaker module impermeability sampling schematic flow sheet according to the utility model embodiment;
Fig. 5 is the instrument and equipment block diagram according to the loudspeaker module tightness test system of the utility model embodiment;
Fig. 6 is the instrument and equipment block diagram according to the loudspeaker module tightness test system of another embodiment of the utility model.
Among the figure:
100 loudspeaker module air tightness test frocks, 500 loudspeaker module tightness test systems
10 closed sound box systems; 11 loudspeaker units;
The back cavity of 12 closed sound box systems 10; The ante-chamber of 13 closed sound box systems 10;
20 box sealing frocks; 21 supports;
22 jacking gears; 23 stationary installations;
24 gland bonnets; 25 sealing strips;
31 loudspeaker modules to be tested; 32 networks;
33 rubber blankets; 51 audio-frequency test appearance;
52 power amplifiers; 53 measuring amplifiers;
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further detailed description.
In the following description; Only some example embodiment of the utility model is described through the mode of explanation; Undoubtedly; Those of ordinary skill in the art can recognize, under the situation of spirit that does not depart from the utility model and scope, can revise described embodiment with various different modes.Therefore, accompanying drawing be described in just illustratively in essence, rather than be used to limit the protection domain of claim.In addition, in this manual, identical Reference numeral indicates identical part.
The utility model provides a kind of air tightness test frock and test macro of loudspeaker module; Below in the statement to the utility model embodiment; The closed that the loudspeaker module casing type of being tested adopts usually, the coil-moving speaker that the loudspeaker monomer type adopts usually.Undoubtedly, other casing types (like inverted phase type, band general formula) and also can carry out air tightness test according to the principle that following embodiment was set forth with the loudspeaker module of the monomer type that carries out work such as other principles such as piezoelectric types.
Fig. 1 and Fig. 2 are respectively the outward appearance and the schematic cross-sections of the loudspeaker module air tightness test frock that relates to of the utility model.
As depicted in figs. 1 and 2, the loudspeaker module air tightness test frock 100 that the utility model provides comprises closed sound box system 10 and box sealing frock 20.Wherein, closed sound box system 10 is that loudspeaker module and sampling loudspeaker module to be tested provides the test environment of predetermined frequencies with the sound pressure level of being scheduled to through its airtight sound field, and for the convenience of testing, this sound field is the high sound pressure low frequency sound field; And in test process, closed sound box system 10 is a closed structure.Box sealing frock 20 is used for loudspeaker module to be tested and sampling loudspeaker module are sealed in the sound field of closed sound box system 10; So that loudspeaker module to be tested or need the loudspeaker module of sampling in the good environment of sealing, to accept test and not receive other Effects of Noise in the environment is guaranteed the accuracy of testing.Be used to equally the to sample collection of normal sensibility criterion of loudspeaker module of this test fixture.
In embodiment illustrated in figures 1 and 2; The structure of closed sound box system 10 comprises ante-chamber 13, back cavity 12; Wherein, In back cavity 12, be provided with the loudspeaker unit 11 that is used to provide measuring sound source, the phonate hole of loudspeaker unit 11 is provided with the network 32 that is used for supporting loudspeaker module to be tested and sampling loudspeaker module towards ante-chamber 13 in ante-chamber 13.
In test process; Loudspeaker module to be tested is placed on the network 32 of ante-chamber 13; Acting force by box sealing frock 20 utilizes gland bonnet 24 with ante-chamber 13 sealings then, in closed sound box system 10, has just formed a confined space that is used to test this moment.Loudspeaker unit 11 is according to the resonance frequency sounding of input to be scheduled to of external control signal; In ante-chamber 13, become the high sound pressure low frequency sound field of preset frequency and predetermined sound pressure level, loudspeaker module to be tested produces the sensitivity signal of test usefulness under the effect of this sound field.
Loudspeaker module for closed; Generally in order to make average pressure and around atmospheric pressure maintenance balance in the chamber; Casing inside and outside differential pressure to avoid temperature or other factors to cause causes damage to loudspeaker, on housing, can offer balancing orifice usually, and the size of balancing orifice needs very little; Like the 0.3mm aperture, and on balancing orifice, also need cover sound-resistance material to avoid balancing orifice to module acoustical behavior generation harmful effect.Therefore, generally, the effect of balancing orifice only limits to the inside and outside atmospheric pressure of balanced module casing, and is small-sized, and has sound-resistance material to cover, and the sound leakage of its generation can be ignored.
In normal test process,, then carry out work (not considering the sound leakage that balancing orifice produces) as the pressure type microphone if the impermeability of loudspeaker module 31 to be tested is good.When there is sound leakage in the loudspeaker module; Sound wave can act on the back side of the vibrating diaphragm of loudspeaker module to be tested through sound leakage; Loudspeaker module to be tested in this case is as differential (perhaps pressure pressure reduction is hybrid) microphone work; This moment, the low-frequency sensitive degree of loudspeaker module to be tested can reduce, and can judge the impermeability of loudspeaker module through this variation.
Because loudspeaker module 31 to be tested is placed on network 32 and accepts test; Grid on the network 32 can reduce the influence of this support to test environment as far as possible, so that measuring sound source can remain unchanged in the process that arrives loudspeaker module 31 to be tested through network 32.In addition, the casing vibration can be fixedly connected the inwall of network 32 with ante-chamber 13 through the rubber blanket 33 (as shown in Figure 2) with pooling feature the influence that network 32 causes when testing in order to reduce as far as possible.Certainly, also can adopt fixedly network of other feasible buffering methods.
In addition; Because to be this closed sound box systems 10 unique need come taking and putting measured examination loudspeaker module and seal the assembly of closed sound box system through open and close for gland bonnet 24; Therefore; In order to make ante-chamber 13 have good air-tightness, gland bonnet 24 and ante-chamber 13 seal between the outer wall that contacts with gland bonnet and add the sealing strip 25 that is made up of rubber blanket or other compressible materials, to increase the airtight effect of 24 pairs of ante-chambers 13 of gland bonnet.
In the Test Application process; Jacking gear 22 cooperates installation with stationary installation 23, gives gland bonnet 24 suitable pressure, makes between gland bonnet 24 and ante-chamber 13 outer walls more closely to be connected; Because if the impermeability of gland bonnet 24 and ante-chamber 13 is bad; Can influence the impermeability of closed sound box system 10, and then influence test result, make test become unstable.If repeatedly test, the difference that requires test result within the scope of measuring error, in an embodiment of the utility model, meet the demands with ante-chamber 13 outer wall impermeability if error within ± 0.03dB, just is regarded as gland bonnet 24.Certainly, the sound leakage degree also can influence the air tightness test result, when sound leakage greatly to a certain degree the time, it is unstable that test might become, the difference of twice test result may exceed the scope of measuring error, should be noted that during the actual debugging of this point.
Fig. 3 is the schematic flow sheet that the test fixture that utilizes above-mentioned the utility model to provide carries out loudspeaker module air tightness test.
As shown in Figure 3, the flow process of utilizing loudspeaker module air tightness test frock illustrated in figures 1 and 2 to carry out loudspeaker module air tightness test comprises:
S310: the airtight sound field that loudspeaker module to be tested is placed the closed sound box system;
S320: form sound field through the sound source in the closed sound box system with predetermined frequencies and the sound pressure level of being scheduled to;
S330: obtain the Sensitirity va1ue of loudspeaker module to be tested at preset frequency point;
S340: judge at the Sensitirity va1ue of above-mentioned preset frequency point whether the impermeability of this loudspeaker module to be tested is qualified in the criterion of above-mentioned preset frequency point and loudspeaker module to be tested according to normal sensibility.
Through this test mode, in normal test process,, then carry out work as the pressure type microphone if the impermeability of loudspeaker module to be tested is good.When there is sound leakage in the loudspeaker module; Sound wave can act on the back side of the vibrating diaphragm of loudspeaker module to be tested through sound leakage; Loudspeaker module to be tested in this case is as differential (perhaps pressure pressure reduction is hybrid) microphone work, and this moment, the low-frequency sensitive degree of loudspeaker module to be tested can reduce.Sensitivity and normal sensibility criterion through obtaining compare, and can judge whether the impermeability of loudspeaker module to be tested is qualified.This mode can be applied to large batch of loudspeaker module air tightness test accurately, fast.
Wherein, the normal sensibility criterion is obtained through the mode of the good loudspeaker module of the impermeability of regulation number of samples being carried out air tightness test, and is similar with flow process shown in Figure 3, specifically as shown in Figure 4 to the process that the sampling of each sampling loudspeaker module is tested:
S410: the loudspeaker module of will sampling places the airtight sound field of closed sound box system;
S420: form sound field through the sound source in the closed sound box system with predetermined frequencies and the sound pressure level of being scheduled to;
S430: obtain the Sensitirity va1ue of sampling loudspeaker module at preset frequency point;
S440: judge whether all sampling loudspeaker module samplings are finished, if do not have, the then sampling of repeating step S410～S430; If sampling finishes, then go to step S450;
S450: the normal sensibility criterion of confirming this preset frequency point according to all sampling loudspeaker modules at the Sensitirity va1ue of identical preset frequency point.
In addition; Too weak and final loudspeaker module air tightness test result is produced harmful effect for fear of the test signal of reality or sampled signal; After obtaining each sampling loudspeaker module and the frequency response signal of loudspeaker module to be tested between preset frequency point, also need utilize amplifier that the frequency response signal that is obtained is carried out processing and amplifying; Calculate the sensitivity difference of loudspeaker module between different preset frequency points according to the frequency response signal after the processing and amplifying then.
In Fig. 3 and air tightness test flow process shown in Figure 4, the Sensitirity va1ue that utilizes a certain preset frequency point as judge the whether qualified foundation of loudspeaker module to be tested (with the normal sensibility criterion relatively).Because under the prerequisite that sound field remains unchanged, the degree harmony leakiness that the low-frequency sensitive degree reduces is directly proportional, promptly the sound leakage degree is big more, and it is many more that the low-frequency sensitive degree reduces.Therefore also can be through the degree of test low-frequency sensitive degree reduction; Whether the impermeability of judging loudspeaker module to be tested is qualified, promptly through calculating the sensitivity difference of different frequency point, treats the impermeability degree of test loudspeaker module and judges; Calculate the sensitivity difference of different frequency point; Difference is big more, explains that the sound leakage degree of loudspeaker module to be tested is big more, with this as the foundation of judging that loudspeaker module impermeability to be tested is whether qualified.
The sensitivity difference of utilizing different preset frequency points is following as the air tightness test process of judging the foundation that loudspeaker module to be tested is whether qualified:
Loudspeaker module to be tested is placed the sound field of airtight predetermined frequencies and the sound pressure level of being scheduled to;
Obtain the Sensitirity va1ue of said loudspeaker module to be tested at different preset frequency points;
Calculate the sensitivity difference of said loudspeaker module to be tested at said different preset frequency points;
Whether the impermeability of judging loudspeaker module to be tested in the difference criterion and the above-mentioned sensitivity difference of different preset frequency points according to normal sensibility is qualified.
Similarly, normal sensibility is obtained through the mode of the good loudspeaker module of the impermeability of regulation number of samples being carried out air tightness test in the difference criterion of different preset frequency points, and detailed process comprises:
The sampling loudspeaker module that impermeability is good places airtight sound field;
Obtain the Sensitirity va1ue of each sampling loudspeaker module respectively at above-mentioned different preset frequency points;
Calculate the sensitivity difference of each sampling loudspeaker module at above-mentioned different preset frequency points;
According to the sensitivity difference of all the sampling loudspeaker modules difference criterion of sensitivity that settle the standard at different preset frequency points.
Can find out according to the foregoing description; The performing leak test frock of the loudspeaker module that application the utility model provides; On the basis of having confirmed the standard criterion, only need loudspeaker module to be tested be placed the closed sound box system of test fixture, just can be easily carry out objective fast judgement to the impermeability of loudspeaker module is whether qualified; Test technology is simple, test result is more accurate and quantification, helps improving testing efficiency.
In the above-described embodiments, the Frequency point of preset frequency can be chosen in 10Hz～100Hz scope, and sound pressure level can be chosen in 100dBSPL～140dBSPL scope.In above-mentioned case study on implementation, the closed sound box system 10 preferred subwoofer sound box systems that adopt resonance frequency low-down (like 10Hz or 20Hz), resonance frequency is low more, and air tightness test sensitivity is high more, and the leak that therefore can detect is more little.
Fig. 5 is the instrument and equipment block diagram according to the loudspeaker module tightness test system of the utility model embodiment.
As shown in Figure 5, the loudspeaker module tightness test system 500 that the utility model provides comprises audio analyzer 51, power amplifier 52, measuring amplifier 53 and aforementioned loudspeaker module air tightness test frock 100.
Wherein, Power amplifier 52 is arranged between the input end of closed sound box system of output terminal and loudspeaker module air tightness test frock 100 of audio analyzer 51, and measuring amplifier 53 is arranged between the input end of output terminal and audio analyzer 51 of closed sound box system of loudspeaker module air tightness test frock 100.
Audio analyzer 51 is used to the swept-frequency signal that closed sound box system 10 provides the frequency signal or the scheduled frequency range of preset frequency point, so that in the closed sound box system, form the sound field of arbitrarily downgrading of predetermined frequencies and predetermined sound; And the loudspeaker module to be tested that is sealed in the closed sound box system that obtains measuring amplifier 53 outputs forms the Sensitirity va1ue that is produced under the sound field of arbitrarily downgrading of predetermined frequencies and predetermined sound in this system; And then confirm according to this Sensitirity va1ue whether the impermeability of loudspeaker module to be tested is qualified; Can select for use known in the industry like Soundcheck, Audio Precision or other system.Power amplifier 52 is used for the frequency signal of audio analyzer 51 outputs is carried out power amplification; Frequency signal after will amplifying then flows to the loudspeaker unit in the closed sound box system, in the closed sound box system, to form the sound field of preset frequency and predetermined sound pressure level; Measuring amplifier 53 is used for the amplification that gains of Sensitirity va1ue to the loudspeaker unit to be tested output that is sealed in the closed sound box system.
Wherein, Audio analyzer comprises the data processing unit (not shown); This data processing unit according to loudspeaker module 31 to be tested at the Sensitirity va1ue of preset frequency point or in the sensitivity difference of different preset frequency points, through with normal sensibility the criterion of above-mentioned preset frequency point or compare in the difference criterion of above-mentioned different preset frequency points whether qualified with the impermeability of judging the loudspeaker module that this is to be tested.
Particularly; As an example; After the sound field of ante-chamber 13 is carried out known calibration; Swept-frequency signal is exported to closed sound box system 10 by audio analyzer 51 via the power amplifier 52 of specifying gain amplifier, and ante-chamber 13 forms the sound field of specifying the sound pressure level assigned frequency, and sampling or loudspeaker module 31 to be tested are positioned in the ante-chamber 13 and receive sound field and produce corresponding signal as microphone; The output signal that sampling or loudspeaker module to be tested 31 produce passes to audio analyzer 51 through the measuring amplifier 53 of specifying gain, and audio analyzer 51 provides test result through specify arithmetic.
In the test process of reality, according to connected mode assembling test system shown in Figure 5, and loudspeaker module 31 to be tested is placed on the network 32, thus the high sound pressure low frequency sound field environment that places closed sound box system 10 in ante-chamber 13, to produce.The sound field with preset frequency and predetermined sound pressure level that closed sound box system 10 produces is the key of the utility model; It has determined the bubble-tight measurement sensitivity of loudspeaker module, and under the prerequisite that system satisfies condition, the sound pressure level of sound field is high more; Low-limit frequency is low more; Measurement sensitivity is high more, therefore, and the sound field of preferred high sound pressure, low frequency.
Predetermined frequencies can be selected in 10Hz～100Hz scope, and predetermined sound pressure level can be in 100dBSPL～140dBSPL scope.In a specific embodiment of the utility model, adopt the swept-frequency signal of forming by 10Hz and two frequencies of 20Hz, export to closed sound box system 10, sound box system 10 produces frequency in ante-chamber 13 be that 10Hz and 20Hz, sound pressure level are the 130dBSPL sound field.In this case, loudspeaker module to be tested receives the sound field of enclosure-type sound box system 10 generations and the sensitivity that produces corresponding frequencies as the moving-coil microphone on the ordinary meaning.Because when loudspeaker module to be tested was worked as the moving-coil microphone, sensitivity usually can be lower, when especially the sound leakage degree was big, in order to satisfy the requirement of signal to noise ratio (S/N ratio), the gain of measuring amplifier was bigger usually, like 40dB.
Treat the implementation procedure that test loudspeaker carries out air tightness test with the loudspeaker module tightness test system using the utility model and provide below the utility model is carried out more deep explanation.
A. will be positioned in the ante-chamber 13 as the good loudspeaker module of impermeability of sampling loudspeaker module;
B. utilize box sealing frock 20 with 10 sealings of closed sound box system, wherein audio analyzer 41 sends the test signal of preset frequency, and test signal is 10 work of input closed sound box system after power amplifier amplifies; Sound source loudspeaker unit 11 in the closed sound box system 10 forms assigned frequency according to the test signal of amplifying and specifies the sound field of sound pressure level in ante-chamber 13; Test out the frequency response curve of sampling sound device module, and calculate the sensitivity difference between the assigned frequency point as microphone work;
C. repeat a, the b step, whether qualified the sampling loudspeaker module of test sufficient amount make the normal sensibility difference criterion of judging between impermeability the assigned frequency point;
In this implementation process; Preferred examples, the resonance frequency of closed sound box system 10 are 10Hz, and it is that 10Hz and 20Hz, sound pressure level are the sound field of 130dBSPL that the closed sound box system produces frequency; In order to improve the output signal-to-noise ratio of loudspeaker module, the gain of measuring amplifier is 40dB.Through implementing the technical scheme in the present embodiment, can be according to the impermeability difference of the different loudspeaker modules that calculate efficiently, technology is more easy, and it is more accurate to judge.
In the above-described embodiments, as long as loudspeaker module to be tested is placed in the sound field, just can test the impermeability of loudspeaker module according to the test technology that the utility model provided; Low-frequency sound source is merely embodiment preferred; The interlock mode of proving installation and sound box system 10 composition modes etc. also can be improved, and the neither enforcement that influences the utility model creation all can realize above-mentioned technique effect.
Can also improve to this case study on implementation; Measuring amplifier is set to a plurality of; Be separately positioned between the input end of output terminal and audio analyzer of closed sound box system, be used for the Sensitirity va1ue of the loudspeaker module output a plurality of to be tested of stop-leak compound closed sound box system is amplified.
Fig. 6 is the instrument and equipment block diagram according to the loudspeaker module tightness test system of another embodiment of the utility model.As shown in Figure 6, through a plurality of measuring amplifiers 53 are set, can measure the impermeability of a plurality of loudspeaker modules 31 simultaneously, certainly, also can measure sampling loudspeaker module simultaneously, can improve testing efficiency in this way.
As above, with the mode of example loudspeaker module air tightness test frock and test macro according to the utility model have been described with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that the test fixture and the test macro that propose for above-mentioned the utility model; Can also on the basis that does not break away from the utility model content, make various improvement and distortion; And these improvement and distortion all drop in the protection domain of the utility model, and those skilled in the art should be understood that; Above-mentioned specific descriptions are just better explained the purpose of the utility model, and the protection domain of the utility model is limited claim and equivalent thereof.
Claims (10)
1. loudspeaker module air tightness test frock comprises:
The closed sound box system, comprise loudspeaker unit that measuring sound source is provided and with the ante-chamber and the back cavity of said loudspeaker unit cooperating, be used to loudspeaker module to be tested airtight sound field be provided;
The box sealing frock is used for said loudspeaker module to be tested is sealed in said closed sound box system.
2. loudspeaker module air tightness test frock as claimed in claim 1 wherein, is provided with the network that is used to support said loudspeaker module to be tested in the ante-chamber of said closed sound box system.
3. loudspeaker module air tightness test frock as claimed in claim 2, wherein,
Said network is fixed on through buffer rubber gasket on the inwall of ante-chamber of said closed sound box system.
4. loudspeaker module air tightness test frock as claimed in claim 1, wherein, said box sealing frock comprises support, jacking gear, stationary installation and gland bonnet, wherein,
Said jacking gear is arranged on the said support, moves in vertical direction along guide rail;
Stationary installation is arranged on the said jacking gear, and is fixedly connected with said gland bonnet, is used for when said jacking gear moves up and down, driving said gland bonnet closure or openness;
Said gland bonnet seals the ante-chamber of said closed sound box system through said stationary installation.
5. loudspeaker module air tightness test frock as claimed in claim 4, wherein,
Ante-chamber sealing contact position at said gland bonnet and said closed sound box system is provided with rubber blanket or sealing strip.
6. like each described loudspeaker module air tightness test frock in the claim 1～5, wherein,
The span of the frequency of said airtight sound field is 10Hz～100Hz, and the span of sound pressure level is 100dBSPL～140dBSPL.
7. a loudspeaker module tightness test system comprises audio analyzer, power amplifier, measuring amplifier and loudspeaker module air tightness test frock, wherein,
Said loudspeaker module air tightness test frock is each described loudspeaker module air tightness test frock in the claim 1～6, comprises closed sound box system and box sealing frock;
Said power amplifier is arranged between the input end of output terminal and said closed sound box system of said audio analyzer, is used for the loudspeaker unit that frequency signal to said audio analyzer output carries out flowing to after the power amplification said closed sound box system;
Said measuring amplifier is arranged between the input end of output terminal and said audio analyzer of said closed sound box system, is used for the amplification that gains of Sensitirity va1ue to the loudspeaker module output to be tested that is sealed in said closed sound box system;
Said audio analyzer is used to the swept-frequency signal that said closed sound box system provides the frequency signal or the scheduled frequency range of preset frequency point; And obtain the Sensitirity va1ue that said measuring amplifier is exported, and confirm according to said Sensitirity va1ue whether the impermeability of said loudspeaker module to be tested is qualified.
8. loudspeaker module tightness test system as claimed in claim 7; Said audio analyzer comprises data processing unit; Said data processing unit according to said loudspeaker module to be tested at the Sensitirity va1ue of preset frequency point or in the sensitivity difference of different preset frequency points, through with normal sensibility the criterion of said preset frequency point or compare in the difference criterion of said different preset frequency points whether qualified with the impermeability of judging said loudspeaker module to be tested.
9. loudspeaker module tightness test system as claimed in claim 7, wherein:
Said measuring amplifier is a plurality of; Be separately positioned between the input end of output terminal and said audio analyzer of said closed sound box system, be used for the amplification that gains of Sensitirity va1ue to the loudspeaker module output a plurality of to be tested that is sealed in said closed sound box system.
10. like each described loudspeaker module tightness test system in the claim 7～9, wherein,
The span of the frequency of the sound field in the said closed sound box system is 10Hz～100Hz, and the span of sound pressure level is 100dBSPL～140dBSPL.
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| CN102384821A (en) * | 2011-08-10 | 2012-03-21 | 歌尔声学股份有限公司 | Test method, test tooling and test system for testing air tightness of loudspeaker module |
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| CN102384821A (en) * | 2011-08-10 | 2012-03-21 | 歌尔声学股份有限公司 | Test method, test tooling and test system for testing air tightness of loudspeaker module |
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| CN110839194A (en) * | 2019-11-09 | 2020-02-25 | 歌尔股份有限公司 | Acoustic device and electronic apparatus |
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| CN113923579A (en) * | 2021-11-17 | 2022-01-11 | 美特科技(苏州)有限公司 | Loudspeaker detection method and system |
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