CN209072742U - A kind of vibrating diaphragm tester - Google Patents
A kind of vibrating diaphragm tester Download PDFInfo
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- CN209072742U CN209072742U CN201821928416.XU CN201821928416U CN209072742U CN 209072742 U CN209072742 U CN 209072742U CN 201821928416 U CN201821928416 U CN 201821928416U CN 209072742 U CN209072742 U CN 209072742U
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- vibrating diaphragm
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- piezoelectric transducer
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Abstract
Disclose a kind of vibrating diaphragm tester, including platform to be measured, PZT (piezoelectric transducer), laser sensor and control device, PZT (piezoelectric transducer) and laser sensor are set on platform to be measured, laser sensor is oppositely arranged with vibrating diaphragm, control device is connect with PZT (piezoelectric transducer), the flexible drive diaphragm oscillations of PZT (piezoelectric transducer) are controlled by control device, laser sensor detection obtains the vibration information of vibrating diaphragm.The utility model can preferably excite diaphragm oscillations, measuring accuracy with higher and preferable stability using PZT (piezoelectric transducer) as controlled excitation source.
Description
Technical field
The utility model relates to loudspeaker testing fields, and in particular to a kind of vibrating diaphragm tester.
Background technique
Loudspeaker is a kind of electricity, power, sonic transducer, is the critical elements in stereo set.Vibrating diaphragm is as inside loudspeakers
Important component, directly affect the performance parameter of loudspeaker, therefore a kind of reliable and stable test method and the survey constructed according to this
It is vital that examination equipment, which carries out test to the diaphragm of loudspeaker,.
Traditional test method is further to push vibrating diaphragm by speaker drive air, then pass through pressure sensor
Or laser sensor captures the amplitude curve of vibrating diaphragm to be measured, to obtain the resonance frequency of vibrating diaphragm.For example, in authorization publication number
, by using sonic transducer, to pick up the pressure change of cavity in the patent of CN201788018U, obtaining the resonance of vibrating diaphragm to be measured
Frequency Fo.Needed in actual test chamber pressure variation have apparent formant, if the Q value of vibrating diaphragm to be measured compared with
Low, the error of resonance frequency Fo test result can be larger, loses the meaning of test.In the patent of Publication No. CN104125532A
In by using driving loudspeaker drive diaphragm oscillations to be measured, the amplitude of laser pickup vibrating diaphragm to be measured obtains the resonance of diaphragm to be measured
Frequency Fo.The above method cannot preferably excite diaphragm oscillations, and measuring accuracy and stability are poor.
Utility model content
In view of this, the present invention provides a kind of vibrating diaphragm testers, drive vibrating diaphragm by the way that control PZT (piezoelectric transducer) is flexible
Vibration, can preferably excite diaphragm oscillations, measuring accuracy with higher and preferable stability.
The utility model embodiment provides a kind of vibrating diaphragm tester, and for detecting the vibration information of vibrating diaphragm, the vibrating diaphragm is surveyed
Trying instrument includes:
Platform to be measured；
At least one PZT (piezoelectric transducer) is set on the platform to be measured, is configured as the controlled flexible drive vibrating diaphragm
Vibration；
Laser sensor is relatively arranged on the platform to be measured with the vibrating diaphragm, obtains the vibrating diaphragm for detecting
Vibration information；
Control device is connect with the PZT (piezoelectric transducer), flexible for controlling the PZT (piezoelectric transducer).
Preferably, the platform to be measured includes:
Pedestal；
Vibrating diaphragm fixing device is set on the pedestal, for fixing the vibrating diaphragm；
Bracket is connect with the pedestal, for fixing the laser sensor.
Preferably, the vibrating diaphragm fixing device includes:
Upper pressing part；
Lower pressing part, is set on the pedestal；
Oscillating plate is set between the upper pressing part and lower pressing part, is formed and is accommodated with the lower pressing part
Cavity；
Fixation member is connect with the oscillating plate, for fixing the vibrating diaphragm；
Wherein, the PZT (piezoelectric transducer) is set in the accommodating cavity body, both ends respectively with the oscillating plate and lower pressing
Component is fixedly connected, the controlled flexible drive oscillating plate and fixation member vibration.
Preferably, the oscillating plate includes the edge part being connected as one, central part and at least one connection edge part
With the rib of central part, the fixation member is connect with the central part of the oscillating plate.
Preferably, the fixation member is provided with the hole with step, and the vibrating diaphragm is fixed on the step.
Preferably, the rib is arcuate structure.
Preferably, the PZT (piezoelectric transducer) for piezoelectric ceramic piece or stacks type piezoelectric ceramics.
Preferably, the PZT (piezoelectric transducer) is cylindrical body or cuboid.
Preferably, the vibrating diaphragm tester further include:
Data processor is connect with the laser sensor, for obtaining vibration parameters according to the vibration information.
Preferably, the vibration parameters include resonance frequency, quality factor, pliable, oscillating mass and displacement curve.
The utility model embodiment discloses a kind of vibrating diaphragm tester, including platform to be measured, PZT (piezoelectric transducer), laser sensing
Device and control device, PZT (piezoelectric transducer) and laser sensor are set on platform to be measured, and laser sensor is oppositely arranged with vibrating diaphragm,
Control device is connect with PZT (piezoelectric transducer), controls the flexible drive diaphragm oscillations of PZT (piezoelectric transducer), laser sensing by control device
Device detection obtains the vibration information of vibrating diaphragm.The utility model embodiment, can be preferable using PZT (piezoelectric transducer) as controlled excitation source
Excitation diaphragm oscillations, measuring accuracy with higher and preferable stability.
Detailed description of the invention
By referring to the drawings to the description of the utility model embodiment, the above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the stereoscopic schematic diagram of the vibrating diaphragm tester of the utility model first embodiment；
Fig. 2 is the cross-sectional view of the vibrating diaphragm fixing device of the utility model first embodiment；
Fig. 3 is the structural schematic diagram of the oscillating plate of the utility model first embodiment；
Fig. 4 is the test curve schematic diagram of the vibrating diaphragm amplitude of the utility model first embodiment；
Fig. 5 is the cross-sectional view of the vibrating diaphragm fixing device of the utility model second embodiment.
Specific embodiment
The utility model is described below based on embodiment, but the utility model is not restricted to these implementations
Example.It is detailed to describe some specific detail sections below in the datail description of the utility model.To those skilled in the art
The utility model can also be understood completely in the description of part without these details for member.In order to avoid obscuring the utility model
Essence, there is no narrations in detail for well known method, process, process, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it should be understood that term " first ", " second " etc. are used for description purposes only,
It is not understood to indicate or imply relative importance.In addition, in the description of the present invention, unless otherwise indicated, it is " more
It is a " it is meant that two or more.
Unless otherwise clearly defined and limited, the terms such as term " installation ", " connected ", " connection ", " fixation " should be done extensively
Reason and good sense solution may be a detachable connection for example, it may be being fixedly connected, or integral；It can be mechanical connection, it can also be with
It is connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
Embodiment one:
Fig. 1-Fig. 2 is the structural schematic diagram of the vibrating diaphragm tester of the present embodiment.As Figure 1-Figure 2, vibrating diaphragm tester packet
Include platform 1, PZT (piezoelectric transducer) 2, laser sensor 3,4 (not shown) of control device and data processor 5 to be measured (in figure not
It shows).Wherein, vibrating diaphragm 6 is connect with PZT (piezoelectric transducer) 2, is set on platform 1 to be measured.The controlled generation of PZT (piezoelectric transducer) 2 is retractable
When change, vibrating diaphragm 6 is driven to vibrate.Laser sensor 3 and the vibrating diaphragm 6 are relatively arranged on platform 1 to be measured, obtain vibration for detecting
The vibration information of film 6.Control device 4 is connect with PZT (piezoelectric transducer) 2, and for controlling, PZT (piezoelectric transducer) 2 is flexible to drive vibrating diaphragm 6 to shake
It is dynamic.
Platform 1 to be measured includes pedestal 11, vibrating diaphragm fixing device 12 and bracket 13.Wherein, vibrating diaphragm fixing device 12 is set to
On the pedestal 11, for fixing vibrating diaphragm 6.Bracket 13 is connect with pedestal 11, for being connected and fixed the laser sensor 3.Institute
It states vibrating diaphragm tester and is additionally provided with height adjustment knob 7, pass through the adjustable laser sensor 3 of height adjustment knob 7 and vibrating diaphragm 6
The distance between, it is focused with realizing.
Vibrating diaphragm fixing device 12 includes upper pressing part 121, lower pressing part 122, oscillating plate 123 and fixation member 124.
Lower pressing part 122 is set on the pedestal 11, is fixedly connected with pedestal 11.The lower pressing part 122 is provided with upwards
The slot of opening, upper pressing part 121 are set as the ring structure matched with lower 122 upper end of pressing part.The oscillating plate 123
It is fixed between the upper pressing part 121 and lower pressing part 122, forms accommodating cavity with the lower pressing part 122.It is excellent
Selection of land, the upper pressing part 121, lower pressing part 122 and oscillating plate 123 pass through screw locking.
PZT (piezoelectric transducer) 2 is set in the accommodating cavity body, and the top of the PZT (piezoelectric transducer) 2 and oscillating plate 123 are fixed
Connection, bottom is fixedly connected with lower pressing part 122.Its fixed form can be connected or be welded etc. to paste.Work as piezoelectric energy-conversion
When 2 controlled generation telescopic deformation of device, oscillating plate 123 is driven to vibrate.In an optional implementation, PZT (piezoelectric transducer) 2 can be with
For piezoelectric ceramic piece or type piezoelectric ceramics is stacked, the number of plies for stacking type piezoelectric ceramics is more than or equal to 10.According to piezoelectric ceramics
Piezoelectric effect, when applying electric signal to PZT (piezoelectric transducer) 2, the dielectric in PZT (piezoelectric transducer) 2 is just in short transverse (electric field
Direction) on generate mechanically deform, change the size of PZT (piezoelectric transducer) 2 in the height direction, and then change and be firmly connected with it
Spacing between oscillating plate 123 and lower pressing part 122.When electric signal disappears, PZT (piezoelectric transducer) 2 restores full size, in turn
Restore the spacing between oscillating plate 123 and lower pressing part 122.It is driven from there through the piezoelectric effect of above-mentioned PZT (piezoelectric transducer) 2
Vibrating diaphragm 6 realizes vibration.In the present embodiment, the PZT (piezoelectric transducer) 2 is cylindrical body or cuboid.The PZT (piezoelectric transducer) 2 is
When cylindrical body, it is highly 1mm-10mm that the cross-sectional diameter of cylindrical body, which is 0.5mm-3mm,.The PZT (piezoelectric transducer) 2 is cuboid
When, the cross section of cuboid is square or rectangle, side length 0.5mm-3mm, is highly 1mm-10mm.
In another optional implementation, the vibrating diaphragm tester may include multiple PZT (piezoelectric transducer)s 2, and multiple piezoelectricity change
It can the generation vibration of 2 common activation vibrating diaphragm 6 of device.Preferably, the vibrating diaphragm tester is provided with 4 PZT (piezoelectric transducer)s 2, is uniformly distributed
Between oscillating plate 123 and lower pressing part 122, vibration can be equably generated with each section of common activation vibrating diaphragm 6, to improve
Detection accuracy.The lower surface of the PZT (piezoelectric transducer) 2 is fixedly connected with lower pressing part 122, in upper surface and oscillating plate 123
Center portion 123c is fixedly connected.
Fixation member 124 is set on oscillating plate 123, is fixedly connected with oscillating plate 123, for fixing vibrating diaphragm 6.The vibration
Movable plate 123, fixation member 124 and vibrating diaphragm 6 form a vibration unit, when oscillating plate 123 follows PZT (piezoelectric transducer) 2 to vibrate,
Fixation member 124 and vibrating diaphragm 6 is driven to vibrate together.Preferably, the edge part that 123 ecto-entad of oscillating plate is connected as one
123a, rib 123c and central part 123b, as shown in Figure 3.Rib 123c connection the edge part 123a and central part 123b.Its
In, the fixation member 124 is connect with the central part 123b of the oscillating plate 123, adjusts vibrating diaphragm fixing device with fast and easy
12 position allows the vibrating diaphragm 6 being fixed in the fixation member 124 and the Laser emission direction of laser sensor 3 same
Axis.In the present embodiment, the plate structure that the rib 123c can have any shape.Preferably, the rib 123c is arc
Shape structure.In the present embodiment, the oscillating plate 123 may include multiple rib 123c.The multiple rib 123c is with identical
Be evenly spaced distributed between edge part 123a and central part 123b.In the present embodiment, oscillating plate 123 includes 20 S
The rib 123c of shape structure.The oscillating plate 123 can be chosen with a thickness of 0.2mm, and material is made of SUS301 stainless steel.
In the present embodiment, the fixation member 124 is connect by screw with the central part 123b of the oscillating plate 123.
The fixation member 124 is provided with the hole with step, and the vibrating diaphragm 6 is fixed on the step.In the present embodiment, described
The material of fixation member 124 can be SUS301 stainless steel.It in the present embodiment, can be by replacing different fixation members
124 realizations are switched fast test to various sizes of vibrating diaphragm 6.
In the present embodiment, the resonance frequency of the vibration unit collectively constituted by oscillating plate 123, fixation member 124 and vibrating diaphragm 6
Rate is far below the resonance frequency of vibrating diaphragm 6, it may thereby be ensured that the precision of the vibration information for the vibrating diaphragm 6 that test obtains.General Oscillation
The resonance frequency F1 of unit are as follows: 100-200Hz, and the resonance frequency F2 of vibrating diaphragm 6 is about are as follows: 1500Hz.Pass through laser testing vibrating diaphragm
Displacement can near the 100Hz with see two peak values near 1500Hz, as shown in Figure 4.If resonance frequency F1 and resonance
Relatively, then two great peak values of amplitude can be unfavorable for mentioning for resonance frequency F2 close to even coinciding together to frequency F2
It takes.Due to the relationship between quality of resonance frequency and vibration unit itself are as follows:
Wherein, f is resonance frequency, and k is the stiffness coefficient of vibration unit, and m is the quality of vibration unit.
According to above-mentioned formula analysis it is found that the humorous of vibration unit can be changed by changing the size of the quality of vibration unit
Vibration frequency.In the present embodiment, the quality of vibration unit can pass through shape, quantity and the oscillating plate of change rib 123c
123 material and thickness etc. change the total quality and elasticity of vibration unit, and then change the resonance frequency of vibration unit.Together
When, it can also be by the resonance frequency F1 of the Mass adjust- ment vibration unit of change fixation member 124, so that the resonance of vibration unit
Frequency F1 is far below the resonance frequency F2 of vibrating diaphragm 6.
Laser sensor 3 and vibrating diaphragm 6 are relatively arranged on platform 1 to be measured.When vibrating diaphragm 6 vibrates, laser sensor 3 is detected
Obtain the vibration information of vibrating diaphragm 6.Height distance between laser sensor 3 and vibrating diaphragm 6 can be adjusted by height adjustment knob 7
Section.Vibrating diaphragm 6 can also be by adjusting vibrating diaphragm fixing device 12 in the horizontal position of pedestal 11, so that laser sensor 3 simultaneously
The central coaxial in Laser emission direction and the vibrating diaphragm 6, raising laser sensor 3 detect the accurate of the vibrating diaphragm information of vibrating diaphragm 6
Degree.The vibrating diaphragm information includes the vibration displacement of vibrating diaphragm, velocity and acceleration etc..In the present embodiment, the laser sensor 3
It can be the laser displacement sensor based on trigonometry principle, be also possible to the laser vibrometer sensing based on laser doppler
Device.
Control device 4 is connect with PZT (piezoelectric transducer) 2 and data processing equipment 5 respectively, and laser sensor 3 and data processing fill
Set 5 connections.Control device 4 is used for 2 output drive signal of PZT (piezoelectric transducer), PZT (piezoelectric transducer) 2 according to the pumping signal into
Row is flexible to drive vibrating diaphragm 6 to vibrate, and then the detection of laser sensor 3 obtains the vibration information of vibrating diaphragm 6 and sends data processing dress to
Set 5.Data processing equipment 5 carries out processing to the vibration information received and obtains vibration parameters, while can also be joined according to vibration
The pumping signal that number adjustment control device 4 is exported to PZT (piezoelectric transducer) 2.The vibration parameters may include Fo value, quality factor q
Mechanics and the parameters,acoustic such as value, pliable Cms, oscillating mass Mms, displacement curve.Laser sensor 3 can detecte out vibrating diaphragm 6 and exist
The information such as the amplitude under different frequency, when the driving frequency of PZT (piezoelectric transducer) 2 is identical as the resonance frequency of vibrating diaphragm 6, vibrating diaphragm is total
Vibration, amplitude reach maximum.
In the present embodiment, when testing, if vibrating diaphragm 6 is not in place, the result that laser sensor 3 detects occurs different
Often, abnormal signal is fed back to data processor 5 by laser sensor 3, and user is prompted to reappose vibrating diaphragm 6, confirms vibrating diaphragm 6
It can continue to test after placement status is good.
In the present embodiment, PZT (piezoelectric transducer) 2 pushes directly on oscillating plate 123 and fixation member 124 is vibrated, and does not need air work
For medium, directly excitation vibrating diaphragm 6 vibrates, and measuring stability is preferable.
Embodiment two:
The present embodiment the difference is that only that the central part 123c of the oscillating plate 123 is annular, institute with embodiment one
It states fixation member 124 and is set as the ring structure to match with the central part 123c.The vibrating diaphragm 6 is set to the central part
Between 123c and the fixation member 124.The central part 123c of the oscillating plate 123 is annular for being that vibrating diaphragm 6 provides vibration
Space.The central part 123c and fixation member 124 are locked by screw to be connected, as shown in Figure 5.In the present embodiment, described
Resonance frequency of the resonance frequency F1 for the vibration unit that oscillating plate 123, fixation member 124 and vibrating diaphragm 6 collectively constitute far below vibrating diaphragm 6
Rate F2, it may thereby be ensured that the precision of the vibration information for the vibrating diaphragm 6 that test obtains.Preferably, the material of the fixation member 124
It can be SUS301 stainless steel.
The utility model embodiment discloses a kind of vibrating diaphragm tester, including platform to be measured, PZT (piezoelectric transducer), laser sensing
Device and control device, PZT (piezoelectric transducer) and laser sensor are set on platform to be measured, and laser sensor is oppositely arranged with vibrating diaphragm,
Control device is connect with PZT (piezoelectric transducer), controls the flexible drive diaphragm oscillations of PZT (piezoelectric transducer), laser sensing by control device
Device detection obtains the vibration information of vibrating diaphragm.The utility model embodiment, can be preferable using PZT (piezoelectric transducer) as controlled excitation source
Excitation diaphragm oscillations, measuring accuracy with higher and preferable stability.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field
For technical staff, the utility model can have various modifications and changes.All institutes within the spirit and principle of the utility model
Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of vibrating diaphragm tester, for detecting the vibration information of vibrating diaphragm, which is characterized in that the vibrating diaphragm tester includes:
Platform to be measured；
At least one PZT (piezoelectric transducer) is set on the platform to be measured, is configured as the controlled flexible drive diaphragm oscillations；
Laser sensor is relatively arranged on the platform to be measured with the vibrating diaphragm, obtains the vibration vibration of membrane for detecting
Information；
Control device is connect with the PZT (piezoelectric transducer), flexible for controlling the PZT (piezoelectric transducer).
2. vibrating diaphragm tester according to claim 1, which is characterized in that the platform to be measured includes:
Pedestal；
Vibrating diaphragm fixing device is set on the pedestal, for fixing the vibrating diaphragm；
Bracket is connect with the pedestal, for fixing the laser sensor.
3. vibrating diaphragm tester according to claim 2, which is characterized in that the vibrating diaphragm fixing device includes:
Upper pressing part；
Lower pressing part, is set on the pedestal；
Oscillating plate is set between the upper pressing part and lower pressing part, forms accommodating cavity with the lower pressing part；
Fixation member is connect with the oscillating plate, for fixing the vibrating diaphragm；
Wherein, the PZT (piezoelectric transducer) is set in the accommodating cavity body, both ends respectively with the oscillating plate and lower pressing part
It is fixedly connected, the controlled flexible drive oscillating plate and fixation member vibration.
4. vibrating diaphragm tester according to claim 3, which is characterized in that the oscillating plate includes the edge being connected as one
The rib in portion, central part and at least one connection edge part and central part, the center of the fixation member and the oscillating plate
Portion's connection.
5. vibrating diaphragm tester according to claim 4, which is characterized in that the fixation member is provided with step
Hole, the vibrating diaphragm are fixed on the step.
6. vibrating diaphragm tester according to claim 4, which is characterized in that the rib is arcuate structure.
7. vibrating diaphragm tester according to claim 1, which is characterized in that the PZT (piezoelectric transducer) is piezoelectric ceramic piece or folds
Heap-type piezoelectric ceramics.
8. vibrating diaphragm tester according to claim 1, which is characterized in that the PZT (piezoelectric transducer) is cylindrical body or rectangular
Body.
9. vibrating diaphragm tester according to claim 1, which is characterized in that the vibrating diaphragm tester further include:
Data processor is connect with the laser sensor, for obtaining vibration parameters according to the vibration information.
10. vibrating diaphragm tester according to claim 9, which is characterized in that the vibration parameters include resonance frequency, quality
The factor, pliable, oscillating mass and displacement curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821928416.XU CN209072742U (en) | 2018-11-21 | 2018-11-21 | A kind of vibrating diaphragm tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821928416.XU CN209072742U (en) | 2018-11-21 | 2018-11-21 | A kind of vibrating diaphragm tester |
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| Publication Number | Publication Date |
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| CN209072742U true CN209072742U (en) | 2019-07-05 |
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| CN201821928416.XU Active CN209072742U (en) | 2018-11-21 | 2018-11-21 | A kind of vibrating diaphragm tester |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940353A (en) * | 2019-11-13 | 2020-03-31 | 中国船舶重工集团公司第七一七研究所 | Piezoelectric excitation device of bare quartz vibrator and quality factor testing device and method |
| CN111698633A (en) * | 2020-06-29 | 2020-09-22 | 时东阳 | Method for measuring TS parameters of loudspeaker |
| CN112188377A (en) * | 2020-09-27 | 2021-01-05 | 广州沈思贸易有限公司 | Sound detection machine utilizing vibration to generate heat to induce vibration diaphragm |
-
2018
- 2018-11-21 CN CN201821928416.XU patent/CN209072742U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940353A (en) * | 2019-11-13 | 2020-03-31 | 中国船舶重工集团公司第七一七研究所 | Piezoelectric excitation device of bare quartz vibrator and quality factor testing device and method |
| CN111698633A (en) * | 2020-06-29 | 2020-09-22 | 时东阳 | Method for measuring TS parameters of loudspeaker |
| CN112188377A (en) * | 2020-09-27 | 2021-01-05 | 广州沈思贸易有限公司 | Sound detection machine utilizing vibration to generate heat to induce vibration diaphragm |
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