CN204933924U - A kind of inertial exciter based on integrated two coil configuration - Google Patents
A kind of inertial exciter based on integrated two coil configuration Download PDFInfo
- Publication number
- CN204933924U CN204933924U CN201520643577.4U CN201520643577U CN204933924U CN 204933924 U CN204933924 U CN 204933924U CN 201520643577 U CN201520643577 U CN 201520643577U CN 204933924 U CN204933924 U CN 204933924U
- Authority
- CN
- China
- Prior art keywords
- coil
- magnet
- yoke
- shell
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
The utility model provides a kind of inertial exciter based on integrated two coil configuration, comprising: dynamic magnet (1), upper coil (13), lower coil (14), leaf spring and shell (2), the circular tube structure that the two ends of described dynamic magnet (1) are symmetrical set, the magnetic field that dynamic magnet (1) is produced annularly tubular structure tube wall form loop, described upper coil (13), lower coil (14) and shell (2) are in integral structure, on this coil (13) and lower coil (14) one end symmetry be positioned at two looping pits (17), after passing into reverse alternating current, coil (13) on this, electromagnetic excitation power in the same way will be produced between lower coil (14) and dynamic magnet (1), make between magnet (1) and shell (2), to produce the excitation that relative motion forms vibration.This inertial exciter utilizes the structure of shell and coil integration to improve the heat-sinking capability of vibrator, improves that it is long-time, the reliability of high power work.
Description
Technical field
The utility model relates to mechanical vibration technology field, particularly a kind of inertial exciter based on integrated two coil configuration.
Background technology
Vibration exciter (being called for short vibrator, also known as actuator) is a kind of is the vibration excitation device of mechanical energy by electric energy conversion, under the driving of input signal, produces the vibration of expection with the mode incentives target of power output.Along with technological progress, in every field such as scientific research, military affairs, automobile, amusements, along with the demand of people to vibration generation or control is day by day strong, the application of vibrator is also more and more extensive.
According to the difference of energy transducer, vibrator can be divided into the kinds such as electromagnetic type, piezoelectric type, magnetostriction type, fluid pressure type.Wherein piezoelectric type, self mechanical impedance of magnetostriction type vibrator are comparatively large, Admissible displacement is lower, is generally suitable for the exciting of high frequency; Fluid pressure type vibrator needs additional external hydraulic system, complex structure and Admissible displacement is lower, but force value is larger; And electromagnetic actuator additional impedance is little, Admissible displacement large, it is the general selection of demand low frequency exciting occasion.
According to the difference of structure and mounting means, vibrator can be divided into common vibrator and inertial exciter again.Common vibrator is generally made up of base and power output, respectively base and power output to be fixed during installation, its mounting structure is complicated and higher to installation accuracy requirement, but power output additional impedance is very little, and vibrator lower limit operating frequency is lower, is generally applied to the occasion of the demand precision measurements such as scientific research.Different from common vibrator, there is not power output in inertial exciter, only needs can normally work fixing for base, thus install simple and easy, application is more extensive, but its lower limit operating frequency is generally higher than common vibrator.
Along with the growth of vibrator application demand, people have higher requirement to its performance indications.The power fan-out capability how improving vibrator under the condition not increasing volume, weight is the main purpose of current vibrator design.Increasing coil current is the most direct method, but now coil thermal power increases equally, and this has higher requirement to the heat dispersion of vibrator.At present, in most vibrator, be connected by the material that the heat conductivilitys such as glue, bakelite shell fragment are not good between coil with shell, and contact area is little, the heat that coil produces is difficult to effectively conduct on shell, thus makes coil easy heat accumulation amount under big current produce high temperature.Also have some vibrators to reduce coil temperature by internally injecting cold air, but the method need complicated auxiliary equipment, and impracticable.Therefore, the major issue how improving the heat dispersion of effective vibrator, suppress the temperature of coil to be vibrator design, can directly promote its fan-out capability.
Utility model content
The purpose of this utility model is, for solving the shortcoming that existing vibrator heat dispersion is poor, energy density is low, mounting structure is complicated, a kind of inertial exciter of novel integrated two coil configuration is provided, utilize this inertial exciter can promote the heat-sinking capability of vibrator, improve that it is long-time, the reliability of high power work.
For achieving the above object, a kind of inertial exciter based on integrated two coil configuration that the utility model provides, has twin coil and single action magnet structure, is a kind of moving-iron type vibrator, comprises: dynamic magnet, shell, leaf spring, upper coil and lower coil.Described leaf spring is annulus tabular elastic construction, for magnet support will be moved in shell, and limit the non axial displacement of braking magnet, the circular tube structure that the two ends of described dynamic magnet are symmetrical set, the magnetic field that dynamic magnet is produced annularly tubular structure tube wall form loop, the end face outside of each circular tube structure is equipped with a looping pit, for placing coil, described looping pit by the inner chamber of circular tube structure and the external world through, described upper coil, lower coil and shell are integral structure, on this, one end of coil and lower coil is symmetricly set in the two ends in shell, its other end symmetry be positioned at two looping pits, after two coils pass into reverse alternating current, coil on this, electromagnetic excitation power in the same way will be produced between lower coil and dynamic magnet, make between magnet and shell, to produce the excitation that relative motion forms vibration.
As the further improvement of technique scheme, described dynamic magnet comprises: iron core, upper permanent magnet, lower permanent magnet, upper yoke, lower yoke; Described iron core is the tubular structure of hollow, the outer wall of its upper/lower terminal is equipped with a ring support, circumferentially offers annular groove between two ring supports; Described upper permanent magnet is installed between a ring support and upper yoke, forms a circular tube structure after making iron core upper end, upper permanent magnet and the combination of upper yoke; Described lower permanent magnet is fixed between another ring support and lower yoke, forms another circular tube structure after making iron core lower end, lower permanent magnet and lower yoke combination.
As the further improvement of technique scheme, described shell comprises: upper cover plate, lower cover and housing, and described upper cover plate and lower cover are covered in upper port and the lower port of housing respectively; The central authorities of this upper cover plate and lower cover are equipped with an annular canister, and respectively as the coil rack twining coil rack and the lower coil coiled, described upper coil and lower coil are wound in the end of annular canister respectively.
As the further improvement of technique scheme, there is arc angling described annular canister and the junction of shell, to increase structural strength and the heat sinking function of annular canister.
As the further improvement of technique scheme, the gap be provided with between the outer wall of described iron core upper end and upper yoke forms a looping pit, and the gap be provided with between the outer wall of this iron core lower end and lower yoke forms another looping pit.Now go up coil, the main body of lower coil lays respectively in the magnetic gap formed by upper yoke and iron core, lower yoke and iron core.
As the further improvement of technique scheme, the quantity of described leaf spring is two; Two described leaf springs are annulus tabular elastic construction, for the weight of a racking magnet, the outer rim of one of them leaf spring is fixed between upper cover plate and housing, its inner rim is then fixed on the outer wall of yoke, the outer rim of another leaf spring is fixed between lower cover and housing, and its inner rim is fixed on the outer wall of lower yoke.Two leaf springs are fixed on housing by the flange that described upper cover plate and lower cover are all arranged by its edge.
As the further improvement of technique scheme, described upper permanent magnet, lower permanent magnet polarize vertically, and utilize glue and iron core and upper yoke, lower yoke fixes, and be installed on its relative one side after on iron core there is identical polarity.
As the further improvement of technique scheme, described iron core, upper yoke, lower yoke all utilize soft magnetic materials overall processing shaping.
As the further improvement of technique scheme, described upper permanent magnet, lower permanent magnet all utilize permanent-magnet material overall processing to circularize structure, or adopt permanent-magnet material to be processed into some sector structures, and are spliced into annulus.
A kind of inertial exciter advantage based on integrated two coil configuration of the present utility model is:
Coil in the utility model inertial exciter and shell carry out integrated design, the heat that coil is produced can effectively conduct on shell, the heating of coil directly can be passed to the external world through shell, the heat dispersion of vibrator is strengthened greatly, improves that it is high-power, the reliability of long-term work; The two ends of dynamic magnet are arranged tubular structure ringwise, the magnetic field that dynamic magnet is produced annularly tubular structure tube wall form loop, the magnetic field overwhelming majority is made to be constrained in this loop inner, thus the magnetic field greatly strengthened in looping pit, hot-wire coil is made to produce stronger power, the two coil configuration be equipped with, makes vibrator under same volume, weight, have higher power fan-out capability, can encourage stronger vibration; This inertial exciter can work under any setting angle simultaneously, improves the scope of application.
Accompanying drawing explanation
Fig. 1 is the cross section view of a kind of inertial exciter based on integrated two coil configuration in the utility model embodiment.
Accompanying drawing identifies:
1, dynamic magnet 2, shell 3, iron core
4, upper permanent magnet 5, lower permanent magnet 6, upper yoke
7, lower yoke 8, upper leaf spring 9, lower leaf spring
10, upper cover plate 11, lower cover 12, housing
13, upper coil 14, lower coil 15, ring support
16, annular canister 17, looping pit 18, annular groove
Detailed description of the invention
Below in conjunction with drawings and Examples, a kind of inertial exciter based on integrated two coil configuration described in the utility model is described in detail.
As shown in Figure 1, a kind of inertial exciter based on integrated two coil configuration that the utility model provides comprises: dynamic magnet 1, shell 2, upper leaf spring 8, lower leaf spring 9, upper coil 13, lower coil 14.Described upper leaf spring and lower leaf spring 9 are all in annulus tabular elastic construction, for dynamic magnet 1 is supported in shell 2, and limit the non axial displacement of braking magnet 1, the circular tube structure that the two ends of described dynamic magnet 1 are symmetrical set, the magnetic field that dynamic magnet 1 is produced annularly tubular structure tube wall form loop, the end face outside of each circular tube structure is equipped with a looping pit 17, for placing coil, described looping pit 17 by the inner chamber of circular tube structure and the external world through, described upper coil 13, lower coil 14 and shell 2 are in integral structure, on this, one end of coil 13 and lower coil 14 is symmetricly set in the two ends in shell 2, its other end symmetry be positioned at two looping pits 17, after passing into reverse alternating current, coil 13 on this, electromagnetic excitation power in the same way will be produced between lower coil 14 and dynamic magnet 1, make between magnet 1 and shell 2, to produce the excitation that relative motion forms vibration.Described upper coil 13, lower coil 14 pass to reversing the current, and cascade or parallel way can be adopted to utilize circumferential work to put row cutting into.
Based on the inertial exciter of said structure, as shown in Figure 1, in the present embodiment, described dynamic magnet 1 comprises: iron core 3, upper permanent magnet 4, lower permanent magnet 5, upper yoke 6, lower yoke 7; Described iron core 3 is the shaping special rotation body structures of time processing, it tubular structure comprising central authorities and two ring supports 15 arranged on the outer wall of this iron core upper/lower terminal; Described upper permanent magnet 4, lower permanent magnet 5 body all can be designed to circular ring structure, are installed on above-mentioned two ring supports 15 respectively; Described upper yoke 6 and lower yoke 7 are special circulus, are installed on respectively on permanent magnet 4 and lower permanent magnet 5.In the present embodiment, described dynamic magnet 1 can combine bonding forming by iron core 3, upper permanent magnet 4, lower permanent magnet 5, upper yoke 6, lower yoke 7, iron core 3 upper end, upper permanent magnet 4 and upper yoke 6 is made to combine rear formation circular tube structure, iron core 3 lower end, lower permanent magnet 5 and lower yoke 7 combine another circular tube structure of rear formation, and the magnetic field produced for dynamic magnet 1 provides magnetic circuit transmission medium.The one side that described upper permanent magnet 4, lower permanent magnet 5 are relative should have identical polarity, if opposite polarity, then originally two independently closed magnetic circuit can produce coupling, affect the magnetic induction intensity at coil place.In addition, between two ring supports 15, circumferentially can offer annular groove 18, two annulus lines are separated, mutually disturb to avoid the magnetic field in two circular tube structure.The gap be provided with between the outer wall of described iron core 3 upper end and upper yoke 6 forms a looping pit 17, the gap be provided with between the outer wall of this iron core 3 lower end and lower yoke 7 forms another looping pit 17, now goes up coil 13, the main body of lower coil 14 lays respectively in the magnetic gap formed by upper yoke 6 and iron core 3 upper end, lower yoke 7 and iron core lower end.In the present embodiment, described upper permanent magnet 4, lower permanent magnet 5 can utilize permanent-magnet material overall processing structure circlewise, in other embodiments, also may be partitioned into some scallop and divide and carry out processing and fabricating, and be spliced into overall annulus when mounted.Described iron core, upper yoke, lower yoke all utilize soft magnetic materials overall processing shaping.Because the two poles of the earth of permanent magnet all contact with soft magnetic materials, the magnetic field overwhelming majority that it is produced is constrained in the loop inner be made up of soft magnetic materials, thus greatly strengthens the magnetic field in looping pit, makes hot-wire coil produce stronger power.
Described shell 2 can comprise: upper cover plate 10, lower cover 11 and housing 12; Described upper cover plate 10, lower cover 11 all can be designed to circular plate-like shape structure, and this upper cover plate 10 and lower cover 11 are covered in upper port and the lower port of housing 12 respectively, are equipped with annular canister 16 in the middle part of it; Respectively as the coil rack twining coil rack and the lower coil coiled, the two ends be arranged in upper cover plate 10 and lower cover 11 of this annular canister 16 symmetry, and with upper cover plate 10, lower cover 11 in integrative-structure, described upper coil 13 and lower coil 14 are wound in the end of above-mentioned annular canister 16 respectively.Each parts of shell 2 can be processed by lightweight metal material, to alleviate the overall weight of vibrator further.
In the present embodiment, described upper cover plate 10, lower cover 11 all use the machine-shaping of magnesium-aluminium alloy material one, and it is lightweight, heat conductivility is better.In other embodiments, described upper cover plate 10, lower cover 11 also can use other materials one machine-shaping or welding fabrication, and concrete material and processing mode needs are determined according to the weight of reality and radiating requirements.Described annular canister 16 can be designed to arc angling structure, to increase structural strength and the heat sinking function of annular canister 16 with the junction of shell 2.
Described upper leaf spring 8, lower leaf spring 9 are annulus tabular elastic construction, the outer rim of upper leaf spring 8 is fixed between upper cover plate 10 and housing 12, its inner rim is then fixed on the outer wall of yoke 6, the outer rim of lower leaf spring 9 is fixed between lower cover 11 and housing 12, its inner rim is fixed on the outer wall of lower yoke 7, for the weight of a racking magnet 1, simultaneously because upper leaf spring 8, lower leaf spring 9 have the advantages that axial rigidity is low, radial rigidity is high, greatly can retrain the non axial displacement of dynamic magnet 1, ensure that vibrator can along arbitrarily angled work.
In addition, there is resonant frequency in the vibrational system be made up of leaf spring and dynamic magnet in inertial exciter, and in the frequency band only more than this frequency, inertial exciter can effective power output excited vibration.Therefore, in order to expand the working band of vibrator, above-mentioned resonant frequency should be more low better.But this frequency is lower, and spring is softer, under the Action of Gravity Field of quality, static displacement is also larger.After static displacement exceedes certain limit, not only coil can jump out the sphere of action of high-intensity magnetic field, and leaf spring is also easy to be damaged due to excessive displacement.Therefore, intrinsic frequency can not infinitely reduce, and its minimum is relevant to the maximum static displacement that can tolerate.In general, the size of vibrator entirety is larger, and the dynamic amplitude peak vibrated between magnet and shell is larger, and the patient maximum static displacement of institute is also larger, and intrinsic frequency is corresponding lower.In the present embodiment, inertial exciter overall height is designed to 100mm, dynamic magnet 1 is 5mm relative to the amplitude peak that shell 2 vibrates, the simple harmonic oscillator intrinsic frequency be made up of dynamic magnet 1 and upper leaf spring 8, lower leaf spring 9 is 20Hz, now the static displacement of dynamic magnet 1 is about 0.6mm, and the inertial exciter with above-mentioned parameter can meet the application demand of most audio frequency.In other embodiments, the size of inertial exciter can expand or reduce, and maximum vibration amplitude and intrinsic frequency also can carry out expanding or reducing according to the actual requirements.
In other embodiments, described dynamic magnet 1 and each part thereof also can be column structures that are square or other shapes, now go up coil 13, lower coil 14 and upper leaf spring 8, lower leaf spring 9 also can have corresponding shape.Described shell 2 and each part thereof also can be column structures that are square or other shapes, and the heat dispersion of vibrator is also improved on its surface by modes such as perforation, cutting, stickup radiators.
It should be noted last that, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted.Although be described in detail the utility model with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is modified or equivalent replacement, do not depart from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (8)
1. based on an inertial exciter for integrated two coil configuration, it is characterized in that, comprising: dynamic magnet (1), upper coil (13), lower coil (14), leaf spring and shell (2), described leaf spring is annulus tabular elastic construction, be supported in shell (2) for magnet (1) will be moved, and limit the non axial displacement of braking magnet (1), the circular tube structure that the two ends of described dynamic magnet (1) are symmetrical set, the magnetic field that dynamic magnet (1) is produced annularly tubular structure tube wall form loop, the end face outside of each circular tube structure is equipped with a looping pit (17), for placing coil, described looping pit (17) by the inner chamber of circular tube structure and the external world through, described upper coil (13), lower coil (14) and shell (2) are in integral structure, on this, one end of coil (13) and lower coil (14) is symmetricly set in the two ends in shell (2), its other end symmetry be positioned at two looping pits (17), after two coils pass into reverse alternating current, coil (13) on this, electromagnetic excitation power in the same way will be produced between lower coil (14) and dynamic magnet (1), make between magnet (1) and shell (2), to produce the excitation that relative motion forms vibration.
2. the inertial exciter based on integrated two coil configuration according to claim 1, it is characterized in that, described dynamic magnet (1) comprising: iron core (3), upper permanent magnet (4), lower permanent magnet (5), upper yoke (6) and lower yoke (7); Described iron core (3) tubular structure in hollow, the outer wall of its top and bottom is equipped with a ring support (15), circumferentially offers annular groove (18) between two ring supports (15); Described upper permanent magnet (4) is fixed between a ring support (15) and upper yoke (6), forms a circular tube structure after making iron core (3) upper end, upper permanent magnet (4) and upper yoke (6) combination; Described lower permanent magnet (5) is fixed between another ring support (15) and lower yoke (7), forms another circular tube structure after making iron core (3) lower end, lower permanent magnet (5) and lower yoke (7) combination; Upper permanent magnet (4), the one side that lower permanent magnet (5) is relative should have identical polarity.
3. the inertial exciter based on integrated two coil configuration according to claim 2, it is characterized in that, the gap be provided with between the outer wall of described iron core (3) upper end and upper yoke (6) forms a looping pit (17), and the gap be provided with between the outer wall of this iron core (3) lower end and lower yoke (7) forms another looping pit (17).
4. the inertial exciter based on integrated two coil configuration according to claim 2, it is characterized in that, described upper permanent magnet (4) and lower permanent magnet (5) adopt permanent-magnet material to be processed into circulus, or adopt permanent-magnet material to be processed into some sector structures, and be spliced into ring-type.
5. the inertial exciter based on integrated two coil configuration according to claim 2, is characterized in that, described iron core (3), upper yoke (6) and lower yoke (7) all adopt soft magnetic materials to make.
6. the inertial exciter based on integrated two coil configuration according to claim 2, is characterized in that, described shell (2) comprising: upper cover plate (10), lower cover (11) and housing (12); Described upper cover plate (10) and lower cover (11) are covered in upper port and the lower port of housing (12) respectively, the center of this upper cover plate (10) and the center of lower cover (11) are equipped with an annular canister (16), coil the coil rack of (13) and the coil rack of lower coil (14) respectively as twining, described upper coil (13) and lower coil (14) are wound in the end of annular canister (16) respectively.
7. the inertial exciter based on integrated two coil configuration according to claim 6, is characterized in that, the curved chamfering structure in junction of described annular canister (16) and shell (2).
8. the inertial exciter based on integrated two coil configuration according to claim 6, is characterized in that, the quantity of described leaf spring is two; The outer rim of one of them leaf spring is fixed between upper cover plate (10) and housing (12), and its inner rim is fixed on the outer wall of yoke (6); The outer rim of another leaf spring is fixed between lower cover (11) and housing (12), and its inner rim is fixed on the outer wall of lower yoke (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520643577.4U CN204933924U (en) | 2015-08-24 | 2015-08-24 | A kind of inertial exciter based on integrated two coil configuration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520643577.4U CN204933924U (en) | 2015-08-24 | 2015-08-24 | A kind of inertial exciter based on integrated two coil configuration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204933924U true CN204933924U (en) | 2016-01-06 |
Family
ID=55001380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520643577.4U Withdrawn - After Issue CN204933924U (en) | 2015-08-24 | 2015-08-24 | A kind of inertial exciter based on integrated two coil configuration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204933924U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106475294A (en) * | 2015-08-24 | 2017-03-08 | 中国科学院声学研究所 | A kind of inertial exciter based on integrated two coil configuration |
-
2015
- 2015-08-24 CN CN201520643577.4U patent/CN204933924U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106475294A (en) * | 2015-08-24 | 2017-03-08 | 中国科学院声学研究所 | A kind of inertial exciter based on integrated two coil configuration |
| CN106475294B (en) * | 2015-08-24 | 2019-06-18 | 中国科学院声学研究所 | A kind of inertial exciter based on integrated two coil configuration |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103731003B (en) | Trt | |
| CN107409257B (en) | Audio transducer stabilization system and method | |
| TWI599242B (en) | Multi-drive transducer with symmetrical magnetic circuit and symmetrical coil circuit | |
| JP2021532706A (en) | Speaker unit and speaker device | |
| CA2838456C (en) | An electromechanical-electroacoustic transducer with low thickness and high travel range and relevant manufacturing method | |
| CN101044787A (en) | Magnetic circuit having dual magnets, speaker and vibration generating apparatus using the same | |
| CN1270488A (en) | Loudspeaker | |
| CN208489985U (en) | Loudspeaker unit and speaker unit | |
| US20070297639A1 (en) | Multiple magnet loudspeaker | |
| TW201309049A (en) | Driver for transducer with two magnets, two magnetic gaps and two coils | |
| KR20220035270A (en) | Loudspeaker unit with multiple drive units | |
| CN103050216A (en) | Electromagnetic actuator for active noise control for amorphous alloy transformers | |
| CN204933923U (en) | A kind of inertial exciter based on twin coil single action magnet structure | |
| CN204933924U (en) | A kind of inertial exciter based on integrated two coil configuration | |
| CN205008213U (en) | Inertial -type vibration exciter of twin coil single action magnet structure based on forced -air cooling heat dissipation | |
| CN205008212U (en) | Inertial -type vibration exciter of twin coil single action magnet structure based on heat dissipation of magnetic current body | |
| CN106475295B (en) | A kind of inertial exciter based on twin coil single action magnet structure | |
| CN107424598A (en) | A kind of electromagnetic induction film resonance sound-absorbing structure and method | |
| CN204046804U (en) | A kind of Novel movable coil loundspeaker | |
| CN106475294A (en) | A kind of inertial exciter based on integrated two coil configuration | |
| CN207321078U (en) | Mobile phone linear oscillator generating means | |
| US20230117602A1 (en) | Improvements in and relating to loudspeaker magnet assemblies | |
| CN107029975A (en) | A kind of inertial exciter of the twin coil single action magnet structure based on wind-cooling heat dissipating | |
| JP4963106B2 (en) | Circular flat speaker | |
| CN110430512A (en) | A kind of loudspeaker reducing distortion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160106 Effective date of abandoning: 20190618 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20160106 Effective date of abandoning: 20190618 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |