CN201788018U - Miniature diaphragm resonance-frequency detector for microphone - Google Patents
Miniature diaphragm resonance-frequency detector for microphone Download PDFInfo
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- CN201788018U CN201788018U CN2010202353698U CN201020235369U CN201788018U CN 201788018 U CN201788018 U CN 201788018U CN 2010202353698 U CN2010202353698 U CN 2010202353698U CN 201020235369 U CN201020235369 U CN 201020235369U CN 201788018 U CN201788018 U CN 201788018U
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- dock leveler
- vibrating diaphragm
- frequency detector
- turning axle
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Abstract
The utility model discloses a miniature diaphragm resonance-frequency detector for a microphone, comprising a base, wherein the base is provided with a sound source, an upright post and a rotating shaft; the sound source is connected with a signal generator; the rotating shaft is rotatably connected with the base; a test object bearing table is sheathe on the rotating shaft; the test object bearing table is connected with the rotating shaft in a sliding manner in the axial direction and is fastened by a fastening mechanism; testing platforms are arranged on the upright post and the rotating shaft; the testing platforms are in rotating connection with the rotating shaft; sound sensors are arranged on the testing platform; the sound sensors are connected with an electroacoustic tester; and when the test object bearing table is positioned at a testing position, a tested object and the sound sensors are positioned in the coaxial direction of acoustic propagation of a sound source. The miniature diaphragm resonance-frequency detector for the microphone can be used for on-line detection in production field, and is a simple-type miniature microphone diaphragm resonance-frequency detector.
Description
Technical field
The utility model relates to a kind of vibrating diaphragm resonant frequency detector, relates in particular to a kind of midget microphone vibrating diaphragm resonant frequency detector.
Background technology
Usually we are in producing minisize electret microphone, for quality and the consistance that guarantees product often needs the important step in the process of producing product is carried out online detection or finished product detection, in the making of electret microphone, vibrating diaphragm is one of vital part, under the constant situation of other parts and manufacture craft, its resonance frequency directly has influence on the important indicator frequency response curve and the sensitivity of product, especially when requiring consistance higher to frequency response curve, if the situation that can't control can appear in the vibrating diaphragm resonance frequency difference that adopts, the product percent of pass of making.So, can measure the resonance frequency of vibrating diaphragm part, and then provide other controls during vibrating diaphragm made and require or carry out the sorting of vibrating diaphragm frequency, be that one of key of product frequency response curve can be freely controlled in basic realization.Its importance is well-known.For this reason, must have and a kind ofly can satisfy the production scene demand, the instrument that carries out fast detecting, certainly, the midget microphone vibrating diaphragm resonant frequency detector that the survey of specialty is used is in demand.To the general measuring method of using of the measurement of diaphragm resonance frequency: the system that is made up of signal generator, audio amplifier (loudspeaker sound source) and electroacoustical measurement instrument carries out frequency sweep and reads its resonant frequency f0, but this often is used for larger-size diaphragm.Then be difficult to realize for midget microphone owing to its size is little.
The utility model content
The utility model provides a kind of simple type midget microphone vibrating diaphragm resonant frequency detector that the production scene is detected that can be used in.
The utility model adopts following technical scheme:
A kind of midget microphone vibrating diaphragm resonant frequency detector, comprise: base, on base, be provided with sound source, column and turning axle, described sound source is connected in signal generator, described turning axle and base are rotationally connected, on turning axle, be arranged with the measured object objective table, described measured object objective table and turning axle is in axial sliding connection and the measured object objective table tightens up by tightening up mechanism, on column and turning axle, be provided with test platform, be the relation of being rotationally connected between described test platform and the turning axle, on test platform, be provided with sonic transducer, described sonic transducer is connected in the electroacoustical measurement instrument, when the measured object objective table was in test position, measured object and sonic transducer were positioned on the acoustic propagation coaxial direction of sound source.
Compared with prior art, the utlity model has following advantage:
(1) utilizes hummer to make sound source, make midget microphone vibrating diaphragm resonant frequency instrument.Hummer is used the electromagnetic type hummer always, and the electromagnetic type hummer just can send the sound pressure level more than the 85dB with 1.5V, the ratio broad that the hummer of electromagnetic type, response frequency can be done can meet test specification of the present utility model, and the sound level maximum of electromagnetic type hummer can also reach 90dB.Electromagnetic type hummer volume is little, and is in light weight, and security is good, and the reliability height is suitable, makes midget microphone vibrating diaphragm resonant frequency instrument.
(2) utilize no vibrating diaphragm, back-polar type electret dedicated test head to detect.Condenser microphone is by sticking the polymer film (perhaps directly using ultrathin metallic film) that the has been metallized thin packing ring by an insulation and a sheet metal (being called backplane) on the becket relative thirty years of age, form one " electric capacity ", on the upper and lower pole plate of this " electric capacity ", impose certain DC voltage (bias voltage), if the electric capacity of this electric capacity is C ', the voltage that applies is V, the electric weight Q=CV on " electric capacity " pole plate then, and the electric capacity of " electric capacity " is to meet
Rule, S is " electric capacity " two-plate relative area, ε is the specific inductive capacity of air gap, d is the distance between the electric capacity two-plate.When external acoustic vibration made the vibrating diaphragm vibration, then corresponding d will vibrate by external acoustical signal thereupon, and d is clocklike changed, thereby C clocklike changes too.When not excessive d became big, C then diminished.Vice versa, changes because the variation of C then can produce a correspondent voltage.(because external bias voltage inconvenience, Q is constant) this voltage is exactly the electromotive force that induces that is caused by external acoustical signal vibration.Pick up this and induce electromotive force, just can finish the acoustic-electric transfer process.The utility model is to have utilized this principle, and the vibrating diaphragm part with in the condenser microphone is set at vibrating diaphragm to be measured, and has removed the condenser microphone (comprising the power supply that bias voltage is provided) of vibrating diaphragm part, then is no vibrating diaphragm, back-polar type dedicated test head.The sixties in last century, after GSessler professor and professor JWest have made in the world first electret capacitor microphone (ECM) with polymer film, the electric field that provides with foil electret has replaced dc bias power, this just makes condenser microphone lose the big burden that must need grid bias power supply, makes that electret capacitor microphone has obtained using very widely.Therefore, the vibrating diaphragm part with in the electret capacitor microphone is set at vibrating diaphragm to be measured, and has removed the electret capacitor microphone of vibrating diaphragm part, then is no vibrating diaphragm, electret back formula dedicated test head.，
(3) be used for the simple type that the production scene is detected.For the detection of production scene, must simple and feasible, accurately convenient, special environment, conditional request need be provided, and it also can carry out the work of the detection diaphragm phase place of production scene, and this microphone production that microphone array of selecting pairing, compatibility to use is used is more effective.
Description of drawings
Fig. 1 is a structure cut-open view of the present utility model.
Fig. 2 is an A-A cut-open view of the present utility model.
Fig. 3 is a B-B cut-open view of the present utility model.
Fig. 4 is a C-C cut-open view of the present utility model.
Fig. 5 is a structural perspective of the present utility model.
Embodiment
A kind of midget microphone vibrating diaphragm resonant frequency detector, comprise: base 9, on base 9, be provided with sound source 12, column 16 and turning axle 10, described sound source 12 is connected in signal generator, described turning axle 10 is rotationally connected with base 9, turning axle 10 is realized by bearing 8 with being rotationally connected of base 9, on turning axle 10, be arranged with measured object objective table 18, described measured object objective table 18 is in axial sliding connection with turning axle 10 and the measured object objective table tightens up by tightening up mechanism, on column 16 and turning axle 10, be provided with test platform 19, be the relation of being rotationally connected between described test platform 19 and the turning axle 10, on test platform 19, be provided with sonic transducer 4, described sonic transducer 4 is connected in the electroacoustical measurement instrument, and when measured object objective table 18 was in test position, measured object and sonic transducer 4 were positioned on the acoustic propagation coaxial direction of sound source 12.
In the present embodiment:
Described sound source 12 is a hummer, and described sonic transducer 4 is no vibrating diaphragm, back-polar type electret microphone; Measured object objective table 18 comprises measured object DOCK LEVELER 13, and is overlapping in the measured object riding position that is provided with on the measured object DOCK LEVELER 13 on first sound transmission aperture and measured object placing plate 14, the first sound transmission aperture and the measured object placing plate 14.Be provided with detent 20 on measured object DOCK LEVELER 13, when measured object objective table 18 was in test position, described detent 20 embedded column 16, and detent 20 contacts with column 16; Tighten up mechanism and adopt screw 7, described screw 7 is threaded with measured object DOCK LEVELER 13, and when measured object DOCK LEVELER 13 was in locking state, screw 7 pushed against turning axle 10; Test platform 19 comprises DOCK LEVELER 6, described DOCK LEVELER 6 is located on column 16 and the turning axle 10, and, DOCK LEVELER 6 is fixedlyed connected with column 16, DOCK LEVELER 6 is realized by screw 11 with fixedlying connected of column 16, DOCK LEVELER 6 is rotationally connected with turning axle 10, is provided with the sonic transducer placing plate 5 and second sound transmission aperture on DOCK LEVELER 6, and described sonic transducer 4 is located on the sonic transducer placing plate 5 and the top of sonic transducer 4 second sound transmission aperture; On DOCK LEVELER 6, be provided with the fixed support 3 that is used for fixing sonic transducer, guarantee that thus the probe 1 on the electroacoustical measurement instrument can form stable contacting with sonic transducer 4.
When the utility model is measured midget microphone vibrating diaphragm resonant frequency, earlier tested diaphragm is installed, and detector installed, then just signal generator is opened, make hummer send acoustical signal, be subjected to the excitation of this acoustical signal, make to be placed on and measure with the vibration of the microphone film on the microphone membrane bar, when reaching resonance frequency f
0The time, by by the signal maximum that sonic transducer picked up, so just on the electroacoustical measurement instrument, shown.Can try to achieve f thus
0
If for diaphragm, then also can just can try to achieve tension force T from following formula.
f
0Resonance frequency, a diaphragm radius, ρ diaphragm density, T tension force.
Then can try to achieve tension force T for non-diaphragm by its corresponding theory formula.
Claims (7)
1. midget microphone vibrating diaphragm resonant frequency detector, it is characterized in that, comprise: base (9), on base (9), be provided with sound source (12), column (16) and turning axle (10), described sound source (12) is connected in signal generator, described turning axle (10) is rotationally connected with base (9), on turning axle (10), be arranged with measured object objective table (18), described measured object objective table (18) is in axial sliding connection with turning axle (10) and the measured object objective table tightens up by tightening up mechanism, on column (16) and turning axle (10), be provided with test platform (19), be the relation of being rotationally connected between described test platform (19) and the turning axle (10), on test platform (19), be provided with sonic transducer (4), described sonic transducer (4) is connected in the electroacoustical measurement instrument, when measured object objective table (18) when being in test position, measured object and sonic transducer (4) are positioned on the acoustic propagation coaxial direction of sound source (12).
2. midget microphone vibrating diaphragm resonant frequency detector according to claim 1 is characterized in that described sound source (12) is a hummer, and described sonic transducer (4) is no vibrating diaphragm, back-polar type electret microphone.
3. midget microphone vibrating diaphragm resonant frequency detector according to claim 1, it is characterized in that, measured object objective table (18) comprises measured object DOCK LEVELER (13), be provided with first sound transmission aperture and measured object placing plate (14) on measured object DOCK LEVELER (13), the measured object riding position on first sound transmission aperture and the measured object placing plate (14) is overlapping.
4. midget microphone vibrating diaphragm resonant frequency detector according to claim 3, it is characterized in that, on measured object DOCK LEVELER (13), be provided with detent (20), when measured object objective table (18) when being in test position, described detent (20) embeds column (16), and detent (20) contacts with column (16).
5. midget microphone vibrating diaphragm resonant frequency detector according to claim 3, it is characterized in that, tighten up mechanism and adopt screw (7), described screw (7) is threaded with measured object DOCK LEVELER (13), when measured object DOCK LEVELER (13) when being in locking state, screw (7) pushes against turning axle (10).
6. midget microphone vibrating diaphragm resonant frequency detector according to claim 1, it is characterized in that, test platform (19) comprises DOCK LEVELER (6), described DOCK LEVELER 6 is located on column (16) and the turning axle (10), and, DOCK LEVELER (6) is fixedlyed connected with column (16), DOCK LEVELER (6) is rotationally connected with turning axle (10), be provided with the sonic transducer placing plate (5) and second sound transmission aperture on DOCK LEVELER (6), described sonic transducer (4) is located on the sonic transducer placing plate (5) and the top of sonic transducer (4) second sound transmission aperture.
7. midget microphone vibrating diaphragm resonant frequency detector according to claim 6 is characterized in that, is provided with the fixed support (3) that is used for fixing sonic transducer on DOCK LEVELER (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202353698U CN201788018U (en) | 2010-06-23 | 2010-06-23 | Miniature diaphragm resonance-frequency detector for microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202353698U CN201788018U (en) | 2010-06-23 | 2010-06-23 | Miniature diaphragm resonance-frequency detector for microphone |
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| Publication Number | Publication Date |
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| CN201788018U true CN201788018U (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202353698U Expired - Fee Related CN201788018U (en) | 2010-06-23 | 2010-06-23 | Miniature diaphragm resonance-frequency detector for microphone |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589675A (en) * | 2012-03-14 | 2012-07-18 | 南京埃斯顿自动控制技术有限公司 | Method for measuring mechanical resonance frequency by using servo driver |
| CN102914358A (en) * | 2012-09-29 | 2013-02-06 | 宁波中策科银电子有限公司 | Test device used for buzzer |
| CN108132095A (en) * | 2017-12-21 | 2018-06-08 | 苏州斯威高科信息技术有限公司 | A kind of measuring method and device of structural member self-resonant frequency |
| CN108156571A (en) * | 2016-12-02 | 2018-06-12 | 西格玛艾尔科技股份有限公司 | Light and small shape loud speaker cone paper resonant frequency check device |
| CN108156570A (en) * | 2016-12-02 | 2018-06-12 | 西格玛艾尔科技股份有限公司 | The loud speaker cone paper resonant frequency check device that practicability makes moderate progress |
| CN112637736A (en) * | 2018-04-26 | 2021-04-09 | 深圳市韶音科技有限公司 | Earphone system and microphone device thereof |
-
2010
- 2010-06-23 CN CN2010202353698U patent/CN201788018U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589675A (en) * | 2012-03-14 | 2012-07-18 | 南京埃斯顿自动控制技术有限公司 | Method for measuring mechanical resonance frequency by using servo driver |
| WO2013135138A1 (en) * | 2012-03-14 | 2013-09-19 | 南京埃斯顿自动控制技术有限公司 | Method for measuring mechanical resonance frequency by using servo driver |
| US9194739B2 (en) | 2012-03-14 | 2015-11-24 | Nanjing Estun Automation, Co. LTD | Method for measuring mechanical resonance frequency using servo driver |
| CN102914358A (en) * | 2012-09-29 | 2013-02-06 | 宁波中策科银电子有限公司 | Test device used for buzzer |
| CN108156571A (en) * | 2016-12-02 | 2018-06-12 | 西格玛艾尔科技股份有限公司 | Light and small shape loud speaker cone paper resonant frequency check device |
| CN108156570A (en) * | 2016-12-02 | 2018-06-12 | 西格玛艾尔科技股份有限公司 | The loud speaker cone paper resonant frequency check device that practicability makes moderate progress |
| CN108132095A (en) * | 2017-12-21 | 2018-06-08 | 苏州斯威高科信息技术有限公司 | A kind of measuring method and device of structural member self-resonant frequency |
| CN112637736A (en) * | 2018-04-26 | 2021-04-09 | 深圳市韶音科技有限公司 | Earphone system and microphone device thereof |
| CN112637736B (en) * | 2018-04-26 | 2022-05-03 | 深圳市韶音科技有限公司 | Earphone system and microphone device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110406 Termination date: 20130623 |