CN105228073B - Open air speakers gas leakage test macro and method - Google Patents
Open air speakers gas leakage test macro and method Download PDFInfo
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- CN105228073B CN105228073B CN201410298091.1A CN201410298091A CN105228073B CN 105228073 B CN105228073 B CN 105228073B CN 201410298091 A CN201410298091 A CN 201410298091A CN 105228073 B CN105228073 B CN 105228073B
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Abstract
The present invention relates to a kind of open air speakers gas leakage test macro and method, to test an open air speakers whether gas leakage, wherein open air speakers include having an opening on a speaker and speaker.Open air speakers gas leakage test macro includes a sealing element, a vacuum generator, one first communicating pipe and a device for pressure measurement.Sealing element is sticked in the opening of open air speakers, and vacuum generator makes to generate a negative pressure value in the speaker, the first communicating pipe then passed through sealing element and be connected to the open air speakers and vacuum generator.Device for pressure measurement measures the equilibrium air pressure value in the speaker of open air speakers, when equilibrium air pressure value is less than default negative pressure value, judges that open air speakers have gas leak phenomenon.The present invention provides a kind of low fault rate and efficient open air speakers gas leakage test macro and method.
Description
Technical field
The present invention refers in particular to a kind of open air speakers gas leakage survey about a kind of loudspeaker gas leakage test macro and method
Test system and method.
Background technique
It is prevailing with various audio-visual amusement, play the message archives in the electronic devices such as sound equipment, computer, TV or mobile phone
As current important user's demand, therefore also to become modern important for the loudspeaker that electric signal can be converted to sound wave
Periphery electronic device.Loudspeaker can be divided into closed loudspeaker and open air speakers according to the design of its loudspeaker box structure, wherein
Open air speakers refer to the loudspeaker being placed in a loudspeaker monomer in one speaker, and speaker is equipped with an opening.When raising
The sound wave that sound device monomer rearward radiates is reflected by the backboard of speaker, then reaches the opening on speaker through a calculated path
When, the phase of the sound wave rearward radiated is identical by the phase for being adjusted to the sound wave radiated forwards with loudspeaker monomer.By
In the above-mentioned sound wave rearward radiated sound consistent with the acoustic phase that loudspeaker monomer radiates forwards, therefore rearward radiating
Wave and the sound wave radiated forwards generate constructive interference after being mutually superimposed, and increase the intensity of low frequency radiation, and then promote loudspeaker
Efficiency.
However, if air-leak section will lead to unconventional sound leakage and shape when the speaker of open air speakers has air-leak section
At noise, cause the sound quality of open air speakers bad.Therefore, before open air speakers factory, it is necessary to test whether leakage
Gas phenomenon is to ensure its quality.
Existing test open air speakers whether the method for gas leakage.For example, it is played using open air speakers low
Sound listens to the surface of open air speakers, then the air-flow by there is No leakage via inspector to generate air pressure by stethoscope
Sound with determine open air speakers whether gas leakage.However, judging whether gas leakage not only needs to consume open air speakers by airflow noise
Take a large amount of detection times, and the judgement of airflow noise is easy to be influenced and judge by accident by human factor.
Therefore, it in order to increase the testing efficiency and accuracy of open air speakers, needs a kind of to improve the prior art
The open air speakers gas leakage test macro and method of missing.
Summary of the invention
Main object of the present invention system provides the open air speakers gas leakage test macro of a kind of high efficiency and high accuracy
And method.
In a preferred embodiment, the present invention provides a kind of open air speakers gas leakage test macro, opens to test one
Whether the formula loudspeaker of putting has gas leak phenomenon, and wherein open air speakers include having an opening, system packet on a speaker and speaker
It includes:
One sealing element, to be sticked in opening, with sealed opening；
One vacuum generator generates a negative pressure value to make in the speaker；
One first communicating pipe, to be connected to open air speakers and vacuum generator, wherein one end of the first communicating pipe
It is protruded into the speaker of open air speakers across sealing element, the other end of the first communicating pipe is connected to vacuum generator；With
And
One device for pressure measurement, the equilibrium air pressure value in the speaker to measure open air speakers；Wherein, pass through ratio
Equilibrium air pressure value and vacuum generator compared with open air speakers sentence the default negative pressure value that a non-defective unit speaker can be generated
Whether disconnected open air speakers have gas leak phenomenon.
Preferably, which includes one second communicating pipe and a pressure gauge, wherein second communicating pipe
One end passes through the sealing element and protrudes into inside the speaker, and the other end of second communicating pipe connects the pressure gauge and is located at and is somebody's turn to do
Outside speaker.
Preferably, a controller is further included, which is electrically connected at the pressure gauge, is surveyed to receive the pressure gauge
The equilibrium air pressure value, when the equilibrium air pressure value is equal to the default negative pressure value, judge the open air speakers without gas leak phenomenon,
When the equilibrium air pressure value is less than the default negative pressure value, judge that the open air speakers have gas leak phenomenon.
Preferably, the sealing element which is made of by one elastic material.
Preferably, a solenoid valve is further included, which was set on the communicating pipe, to control a gas in the communicating pipe
Whether the circulation of stream.
Preferably, a voltage-stablizer is further included, which was set on the communicating pipe, to stablize one in the communicating pipe
Air pressure.
Preferably, the vacuum generator include a pressure stabilizing mould group and one switch, the pressure stabilizing mould group to stablize this first
An air pressure in communicating pipe, whether the switch is to control the circulation of the air-flow in first communicating pipe.
Preferably, which further includes a sound guide tube and a loudspeaker monomer, loudspeaker monomer insertion
In the speaker, which is set to inside this, and one end of the sound guide tube is connected to the opening.
In another preferred embodiment, the present invention provides a kind of open air speakers gas leakage test method, to test one
Whether open air speakers have gas leak phenomenon, and wherein open air speakers include having an opening, method on a speaker and speaker
Include:
Seal the opening of open air speakers；
It is respectively communicated with inside a vacuum generator and a device for pressure measurement to the speaker of open air speakers；
Start vacuum generator, generates a negative pressure value in the speaker to make；
Wait the air pressure balance between in vacuum generator and the speaker of open air speakers；
Measure the equilibrium air pressure value in the speaker of open air speakers；And
The equilibrium air pressure value and vacuum generator for comparing open air speakers can be generated a non-defective unit speaker one default
Negative pressure value is used and judges whether open air speakers have gas leak phenomenon.
Preferably, the opening for sealing the open air speakers includes placing a sealing element to be sticked in the opening.
Preferably, it is connected to inside the vacuum generator to the speaker of the open air speakers including the use of one first connection
Pipe, wherein one end of first communicating pipe passes through the opening and protrudes into the speaker of the open air speakers, first connection
The other end of pipe is connected to the vacuum generator.
Preferably, the device for pressure measurement being connected to inside the device for pressure measurement to the speaker of the open air speakers
Including one second communicating pipe and a pressure gauge, wherein one end of second communicating pipe passes through the opening and protrudes into the speaker
Portion, and the other end of second communicating pipe connects the pressure gauge and is located at outside the speaker.
Detailed description of the invention
Fig. 1 is the schematic diagram of open air speakers of the invention.
Fig. 2 is the sectional view of open air speakers of the invention.
Fig. 3 is the schematic diagram of open air speakers gas leakage test macro of the invention.
Fig. 4 is the flow chart of open air speakers gas leakage test method of the invention.
Fig. 5 is the schematic diagram of another embodiment of open air speakers gas leakage test macro of the invention.
Symbol description
Open air speakers 10
Loudspeaker monomer 11
Speaker 12
Opening 13
Sound guide tube 14
Loudspeaker gas leakage test macro 20,30
Sealing element, cork 21,31
Vacuum generator 22,32
Pressure stabilizing mould group 321
Switch 322
First communicating pipe 23,33
One end 231 of first communicating pipe
The other end 232 of first communicating pipe
Device for pressure measurement 24,34
Second communicating pipe 241,341
Pressure gauge 242,342
One end 243 of second communicating pipe
The other end 244 of second communicating pipe
Solenoid valve 25
Voltage-stablizer 26
Controller 27,35
Step S11~S16
One end A of cork
The other end B of cork
Specific embodiment
Open air speakers of the invention mean that speaker is equipped with the loudspeaker of opening, such as using phase inverted cabinet
The loudspeakers such as (Bass Reflex Enclosure), labyrinth type speaker or horn-type speaker.In this preferred embodiment, open
Formula loudspeaker is put by taking the loudspeaker of application phase inverted cabinet as an example, but is not limited thereto.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram of open air speakers of the invention, and Fig. 2 is of the invention open
The sectional view of loudspeaker.As shown in Figures 1 and 2, open air speakers 10 are opened including a loudspeaker monomer 11, a speaker 12, one
Mouth 13 and a sound guide tube 14.Wherein, loudspeaker monomer 11 is embedded in speaker 12, and opening 13 is set to the surface of speaker 12, leads
Sound tube 14 is set in speaker 12, and one end of sound guide tube 14 is connected to opening 12.Function about opening 13 and sound guide tube 14
It will be in being illustrated below.
When loudspeaker monomer 11 shakes and generates sound wave, sound wave can be divided into the sound wave radiated in front of loudspeaker monomer 11
With the sound wave to 11 Backside radiation of loudspeaker monomer.Since human ear is less sensitive for low-frequency sound wave, if can will be to loudspeaker
Outside the sound wave export speaker 12 of 11 Backside radiation of monomer, then low frequency radiation can be further increased.However, the sound wave radiated forwards
With the opposite in phase of the sound wave rearward radiated, if the rearward radiative acoustic wave without any processing is directly spread out of speaker 12,
Then two kinds of sound waves will interfere with each other because of phase difference and cause the efficiency of loudspeaker 10 bad.Therefore, when rearward radiation sound
Wave is reflected by the backboard of speaker 12, and when arriving at the opening 13 on speaker 12 via sound guide tube 14, rearward radiative acoustic wave
Phase be inverted and become reverse phase sound wave, and it is consistent with the phase of radiative acoustic wave forwards.In this way, above-mentioned reverse phase
Sound wave can mutually be superimposed with the sound wave radiated forwards, and then increase the low frequency radiation of open air speakers 10.Due to opening
The structure and principle of formula loudspeaker 10 are identical as the loudspeaker for being normally applied phase inverted cabinet, will not be described in great detail in this.
Referring to Fig. 3, Fig. 3 is the schematic diagram of open air speakers gas leakage test macro of the invention.As shown in figure 3, opening
Putting formula loudspeaker gas leakage test macro 20 includes a sealing element 21, a vacuum generator 22, one first communicating pipe 23, pressure survey
Measure device 24, a solenoid valve 25, a voltage-stablizer 26 and a controller 27.
Sealing element 21 is sticked in the opening 13 of open air speakers 10, to sealed opening 13 so as to be formed inside speaker 12
Enclosure space.Sealing element 21 is chosen as a sealing element as made by elastic material, wherein elastic material be rubber, cork or
Plastic cement, but be not limited thereto.In this preferred embodiment, sealing element 21 is not limited thereto by taking cork as an example.This
Outside, a first end A and a second end B that cork 21 includes, wherein the first end A of cork 21 passes through opening 13 and is located at
Among open air speakers 10, the second end B of cork 21 is then located at except open air speakers 10.
It can not be successfully sealed opening 13 in order to avoid generating gap between cork 21 and opening 13, thus cause to open
Enclosure space can not be formed inside formula loudspeaker 10, in this preferred embodiment, the opening 13 of open air speakers 10 is a circle
Shape opening, and structure and 13 corresponding cones of opening can be used in cork 21.Furthermore the diameter of the first end A of cork 21
Less than the diameter of opening 13, and the diameter of the second end B of cork 21 is greater than the diameter of opening 13, uses and increases the card of cork 21
Adaptation when together in opening 13.
Vacuum generator 22 forms vacuum pneumatic by the flowing of compressed air, and then extracts the air inside speaker 12,
Make to generate a negative pressure value inside speaker 12.In addition, after vacuum generator 22 is evacuated a preset time to a non-defective unit speaker, such as
5 seconds, the negative pressure value that non-defective unit speaker inside generates will be defined as a default negative pressure value.However, open loudspeaking of the invention
Device gas leakage test macro is not limited with negative pressure, in other embodiments, also using the device for generating positive pressure, is made inside speaker
A positive pressure value is generated to be tested.
First communicating pipe 23 to be connected to open air speakers 10 and vacuum generator 22, wherein the one of the first communicating pipe 23
End 231 passes through sealing element 21 and protrudes into the speaker 12 of open air speakers 10, and the other end 232 of the first communicating pipe 23 connects
It is connected to vacuum generator 22.
Illustrate the element and set-up mode of device for pressure measurement 24 below.Device for pressure measurement 24 included one second communicating pipe
241 and a pressure gauge 242, wherein the second communicating pipe 241 is to be connected to open air speakers 10 and pressure gauge 242.Second connects
One end 243 of siphunculus 241 protrudes into the inside of speaker 12 across sealing element 21, and the other end 244 of the second communicating pipe 241 then connects
It connects pressure gauge 242 and is located at the outside of speaker 12.Pressure gauge 242 is known barometer, to measure one inside speaker 12
Equilibrium air pressure value.After vacuum generator 22 extracts the air in speaker 12, the air pressure inside speaker 12 will gradually connect with first
Air pressure in siphunculus 23 generates balance, and equilibrium air pressure value is formed inside speaker 12.In this way, which pressure gauge 242 is through the
Two communicating pipes 241 can directly measure the equilibrium air pressure value inside speaker 12, be not easily susceptible to vacuum generator 22 and extract air when institute
The airflow influence of generation, thus it is able to measure more accurately atmospheric pressure value.
Controller 27 is electrically connected at pressure gauge 242, to receive equilibrium air pressure value measured by pressure gauge 242.When flat
When weighing apparatus atmospheric pressure value is equal to the default negative pressure value that vacuum generator 22 can be generated non-defective unit speaker, controller 27 judges open raise
Sound device 10 is without gas leak phenomenon, when equilibrium air pressure value is less than the default negative pressure value that vacuum generator 22 can be generated non-defective unit speaker
When, indicate speaker 12 outside air enter inside speaker 12 via the air-leak section of speaker 12, therefore controller 27 judge it is open
Loudspeaker 10 has gas leak phenomenon.
Whether controlling the circulation of air-flow in the first communicating pipe 23 when in addition, detecting for convenience, and control the first connection
For air-flow in pipe 23 to stablize the air pressure in the first communicating pipe 23, open air speakers gas leakage test macro 20 is equipped with solenoid valve 25
And voltage-stablizer 26.Wherein, solenoid valve 25 and voltage-stablizer 26 be respectively arranged at vacuum generator 22 one end but not as
Limit.Whether solenoid valve 25 is to control the circulation of air-flow in the first communicating pipe 23, passed through when vacuum generator 22 is evacuated speaker 12
After crossing preset time, solenoid valve 25 will be closed, so that vacuum generator 22 is no longer evacuated speaker 12.Voltage-stablizer 26 is used
It is excessive to avoid the air pressure change in the first communicating pipe 23 to stablize the air pressure of air-flow in the first communicating pipe 23, lead to pressure gauge
242 reading is not easy interpretation.In addition, in order to make loudspeaker gas leakage test automation and test jobs of being more convenient for, solenoid valve 25 with
Voltage-stablizer 26 can be respectively and electrically connected to controller 27, and can be controlled via controller 27, but be not limited thereto.
Illustrate the test method about open air speakers gas leakage test macro of the invention below.Referring to Fig. 4, Fig. 4
For the flow chart of open air speakers gas leakage test method of the invention.As shown in figure 4, open air speakers gas leakage test method
Including step S11~S16.Step S11 first is closed the opening 13 of open air speakers 10 using sealing element 21, makes speaker 12
Inside forms enclosure space.Step S12 is respectively communicated with vacuum generator 22 and device for pressure measurement 24 to open air speakers 10
Speaker 12 inside.From the above, the first communicating pipe 23 can be used to be connected to vacuum generator 22 and speaker 12, the second communicating pipe
241 can be used to be connected to the pressure gauge 242 and speaker 12 of device for pressure measurement 24.
Then step S13, starting vacuum generator 22 start to extract air, to make the inside of speaker 12 generate negative pressure
Value.Step S14 waits the air pressure balance between in vacuum generator 22 and the speaker 12 of open air speakers 10.Step S15,
Equilibrium air pressure value after measuring the balance in the speaker 12 of open air speakers 10.Step S16 compares open air speakers 10
The default negative pressure value that equilibrium air pressure value and vacuum generator 22 can be generated non-defective unit speaker, uses judgement open air speakers
Whether 10 have gas leak phenomenon.When equilibrium air pressure value is equal to the default negative pressure value of vacuum generator 22, open air speakers are judged
10 judge that open air speakers 10 have when the equilibrium air pressure value is less than the default negative pressure value of vacuum generator without gas leak phenomenon
Gas leak phenomenon.In this preferred embodiment, the default negative pressure value for comparing equilibrium air pressure value and vacuum generator is connected through electrical
The controller 27 for being connected to pressure gauge 242 is completed, but is not limited thereto.In other preferred embodiments of the invention, it can pass through
Reviewer compares the default negative pressure value of equilibrium air pressure value and vacuum generator.
Then illustrate the another preferred embodiment of loudspeaker gas leakage test macro of the invention.Referring to Fig. 5, Fig. 5 is this
The schematic diagram of another embodiment of the open air speakers gas leakage test macro of invention.As shown in figure 5, open air speakers gas leakage
Test macro 30 is to test open air speakers 10.Open air speakers gas leakage test macro 30 includes a sealing element 31, one
Vacuum generator 32, one first communicating pipe 33, a device for pressure measurement 34 and a controller 35, wherein device for pressure measurement 34
Including one second communicating pipe 341 and a pressure gauge 342.
Open air speakers gas leakage test macro 30 is roughly the same with the open air speakers gas leakage test macro 20 of Fig. 3,
Different is in vacuum generator 32 including a pressure stabilizing mould group 321 and a switch 322, and pressure stabilizing mould group 321 and switch
Voltage-stablizer 26 and solenoid valve 25 in the 322 open air speakers gas leakage test macro 20 to replace Fig. 3.Wherein, pressure stabilizing mould
Group 321 to stablize the air pressure in the first communicating pipe 33, and switch 322 to control in the first communicating pipe 33 circulation of air-flow and
It is no.In this way, which open air speakers gas leakage test macro 30 additionally setting voltage-stablizer 26 can need not also be stablized with solenoid valve 25
With air-flow in the first communicating pipe 33 of control.Since open air speakers gas leakage test macro 30 and the open air speakers of Fig. 3 are leaked
The device of gas test macro 20 is identical as mode of operation, will not be described in great detail in this.
According to the explanation of the above preferred embodiment it is found that open air speakers gas leakage test macro and method of the invention is first
Negative pressure value is generated using speaker of the vacuum generator to open air speakers, through the balance in device for pressure measurement measurement speaker
Atmospheric pressure value, then preset by comparing the equilibrium air pressure value and vacuum generator of open air speakers to what non-defective unit speaker can be generated
Negative pressure value, and then judge whether open air speakers have gas leak phenomenon.In this way, replace known listen using device for pressure measurement
The gas leakage method of testing for examining device not only reduces the probability artificially judged by accident, increases the efficiency of open air speakers gas leakage test, more because of pressure
Force measuring device directly measures the equilibrium air pressure value inside speaker, avoids the interference in air flow pressure measurement of the generation of vacuum generator
Device, and then promote the precision of the equilibrium air pressure value inside measurement speaker.
The foregoing is merely presently preferred embodiments of the present invention, the claim being not intended to limit the invention, therefore
It is all other without departing from the equivalent change or modification completed under disclosed spirit, the application for being intended to be limited solely by this case is special
In sharp range.
Claims (6)
1. a kind of open air speakers gas leakage test macro, special to test whether an open air speakers have gas leak phenomenon
Sign is that the open air speakers include having an opening on a speaker and the speaker, which includes:
One sealing element, to be sticked in the opening, to seal the opening；
One vacuum generator generates a negative pressure value to make in the speaker；
One first communicating pipe, to be connected to the open air speakers and the vacuum generator, wherein the one of first communicating pipe
End is protruded into the speaker of the open air speakers across the sealing element, and it is true that the other end of first communicating pipe is connected to this
Empty generator；And
One device for pressure measurement, the equilibrium air pressure value in the speaker to measure the open air speakers；Wherein, pass through ratio
The default negative pressure that one non-defective unit speaker can be generated compared with the equilibrium air pressure value of the open air speakers and the vacuum generator
It is worth and judges whether the open air speakers have gas leak phenomenon；
The open air speakers further include a sound guide tube and a loudspeaker monomer, which is embedded in the speaker, should
Sound guide tube is set to inside the speaker, and one end of the sound guide tube is connected to the opening；
The device for pressure measurement includes one second communicating pipe and a pressure gauge, and wherein it is close to pass through this for one end of second communicating pipe
Sealing and protrude into inside the speaker, and the other end of second communicating pipe connect the pressure gauge and be located at the speaker outside；
The sealing element that the sealing element is made of by one elastic material；
The open air speakers are the loudspeaker using phase inverted cabinet.
2. open air speakers gas leakage test macro as described in claim 1, which is characterized in that a controller is further included, it should
Controller is electrically connected at the pressure gauge, equilibrium air pressure value surveyed to receive the pressure gauge, when the equilibrium air pressure value etc.
When this presets negative pressure value, the open air speakers are judged without gas leak phenomenon, when the equilibrium air pressure value is less than the default negative pressure value
When, judge that the open air speakers have gas leak phenomenon.
3. open air speakers gas leakage test macro as described in claim 1, which is characterized in that a solenoid valve is further included, it should
Solenoid valve was set on first communicating pipe, whether to control the circulation of an air-flow in first communicating pipe.
4. open air speakers gas leakage test macro as described in claim 1, which is characterized in that a voltage-stablizer is further included, it should
Voltage-stablizer was set on first communicating pipe, to stablize the air pressure in first communicating pipe.
5. open air speakers gas leakage test macro as described in claim 1, which is characterized in that the vacuum generator includes one
Pressure stabilizing mould group and a switch, the pressure stabilizing mould group is to stablize the air pressure in first communicating pipe, and the switch is to control this
In first communicating pipe whether the circulation of air-flow.
6. a kind of open air speakers gas leakage test method, special to test whether an open air speakers have gas leak phenomenon
Sign is, the open air speakers include there is an opening on a speaker and the speaker, this method comprises:
Close the opening of the open air speakers；
It is respectively communicated with inside a vacuum generator and a device for pressure measurement to the speaker of the open air speakers；
Start the vacuum generator, generates a negative pressure value in the speaker to make；
Wait the air pressure balance between in the vacuum generator and the speaker of the open air speakers；
Measure the equilibrium air pressure value in the speaker of the open air speakers；And
The equilibrium air pressure value and the vacuum generator for comparing the open air speakers can be generated a non-defective unit speaker one pre-
If negative pressure value, uses and judge whether the open air speakers have gas leak phenomenon；
The opening for sealing the open air speakers includes placing a sealing element to be sticked in the opening；
Be connected to including the use of one first communicating pipe inside the vacuum generator to the speaker of the open air speakers, wherein this
One end of a connecting pipe passes through the opening and protrudes into the speaker of the open air speakers, and the other end of first communicating pipe connects
It is connected to the vacuum generator；
Being connected to the device for pressure measurement inside the device for pressure measurement to the speaker of the open air speakers includes one second
Communicating pipe and a pressure gauge, wherein one end of second communicating pipe pass through the opening and protrude into inside the speaker, and this second
The other end of communicating pipe connects the pressure gauge and is located at outside the speaker.
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| CN201410298091.1A CN105228073B (en) | 2014-06-26 | 2014-06-26 | Open air speakers gas leakage test macro and method |
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| CN105228073B true CN105228073B (en) | 2019-06-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106052963A (en) * | 2016-05-20 | 2016-10-26 | 黄泽浩 | Device used for clinical test of VSD air leakage |
| CN207744106U (en) * | 2017-02-10 | 2018-08-17 | 深圳市启元数码科技有限公司 | A kind of new waterproof bone conduction earphone |
| CN107135456B (en) * | 2017-04-27 | 2020-12-08 | 歌尔智能科技有限公司 | Sound box air leakage detection device and method and computer readable storage medium |
| CN110933539A (en) * | 2019-11-27 | 2020-03-27 | 上海易和声学科技有限公司 | Method for assembling loudspeaker assembly with waterproof cavity |
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| CN2888506Y (en) * | 2006-02-15 | 2007-04-11 | 广州市花都科达电器有限公司 | Gas leakage detector |
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| US7513141B2 (en) * | 2003-09-09 | 2009-04-07 | Applied Films Corporation | Method for differentially pumping endblock seal cavity |
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| US3369392A (en) * | 1965-03-08 | 1968-02-20 | Christensson Od Wikar | Method and apparatus for vacuum testing plastic lined card-board cartons |
| CN2888506Y (en) * | 2006-02-15 | 2007-04-11 | 广州市花都科达电器有限公司 | Gas leakage detector |
| CN102065346A (en) * | 2009-11-11 | 2011-05-18 | 鸿富锦精密工业（深圳）有限公司 | Sound box |
| CN201716165U (en) * | 2010-07-14 | 2011-01-19 | 北京物资学院 | Gas tightness detecting device |
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