CN204518013U - The anti-type earphone of high radiation - Google Patents
The anti-type earphone of high radiation Download PDFInfo
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- CN204518013U CN204518013U CN201520046969.2U CN201520046969U CN204518013U CN 204518013 U CN204518013 U CN 204518013U CN 201520046969 U CN201520046969 U CN 201520046969U CN 204518013 U CN204518013 U CN 204518013U
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Abstract
The anti-type earphone (LXEp) of high radiation, loud speaker front loads one " sound binding energy tube ", and the loud speaker back side is coupled with an acoustic compliance cavity; " sound binding energy tube " volume is greater than acoustic compliance cavity volume; " sound binding energy tube " is rigid material structure, comprises any one type in opposite sign cylinder and multiple bushing type, scroll casing type and spiral of Archimedes formula foldable structure.LXEp both can obtain high efficiency, low distortion and good LF-response, the auditory fatigue that traditional closed earphone " stethoscope effect " can be avoided again to cause and hearing impairment." green health earphone " effectively can solve conventional earphone tonequality, contradiction between efficiency and health." enable voice is more interesting to listen to " sound field degree of depth, level and the power of parsing, knot image force, telepresenc promote (horn type earphone)." sound binding energy tube " can improve the tone color of dynamic iron earphone, breaches the restriction that dynamic iron earphone cannot adopt semi open model structure.
Description
Technical field
The utility model relates to a kind of earphone---and be the semi open model earphone that a kind of ante-chamber opens specifically.
Background technology
Along with " new media " (smart mobile phone/panel computer etc.) mobile terminal develop rapidly---earphone is as " mobile personal sound system ", with advantages such as its hands-free property/lightweight/portability, be more suitable for coordinating with " new media " mobile terminal.Relative to Miniature acoustics---earphone has " individual specificity ", and power/volume is little, and portability is better.
Earphone is listened to and is belonged to " super near sound field "---as main flow " new media sound equipment ", more should health be focused on.General earphone often only focuses on Hi-Fi (acoustics)/stability (mechanics)/wholesomeness (ear type)/fail safe, some earphones meet " ergonomics " principle, but just focus on comfortableness---and health is not put in the first place.
" stethoscope effect " (the Stethophone Effect)---closed earphone external auditory meatus is airtight, " air spring " stiffness Sa ↑ → acoustic pressure Pa ↑ → acoustic impedance Za ↑ → acoustic admittance Ya ↑ (more mating with the acoustic impedance of eardrum), thus its efficiency high/distortion is little---earphone diaphragm forms " coupled vibrations " (being similar to stethoscope) by external auditory meatus air column and eardrum.
" fish and bear's paw can not get both "---general earphone, in order to obtain high efficiency/low distortion and good LF-response, all adopts enclosed construction---but large for the stimulation of eardrum, easily cause auditory fatigue/hearing impairment.
Relative to audio amplifier, earphone dimension is little, and the front/rear chamber of full open model earphone all can entrant sound, and medium and low frequency sound wave more easily occurs " acoustic short circuit "---therefore general earphone does not adopt full open model, but adopt semi open model.Semi open model earphone is " ante-chamber closes/back cavity opening " mostly, mainly in order to improve LF-response---ante-chamber (on front side of loud speaker the operatic tunes) is closed, then efficiency increase/distortion reduces (stethoscope effect); Back cavity (on rear side of loud speaker the operatic tunes) is open, and acoustic compliance Ca increases, then loud speaker fo declines.Although " Hi-Fi " of earphone is better, its " health " is poor---but the same with closed earphone, easily cause auditory fatigue/hearing impairment.
Earphone ante-chamber volume is general all much smaller than back cavity volume, even if add phonocatheter (In-Ear), ante-chamber volume is also smaller---and ante-chamber volume reduces, and is conducive to promoting high frequency response; Back cavity volume increases, and is conducive to improving LF-response.
AKG semi open model earphone adopts " ante-chamber is open ", and structure---disclosed by US4158753 " Headphone of circumaural design "---can strengthen " Auricle effect ", weaken " in head effect ".Earphone ante-chamber arranges that " acoustic friction damper " and passive radiator---" acoustic friction damper " offers through hole, and inner side has damping material, can reflection attenuation ripple make its time delay, simulating nature sound field.Passive radiator can improve LF-response---but acoustic compliance Ca may be made to trend towards ∞ (open circuit) due to " acoustic friction damper " through hole, and weaken " Hai Muhuoci acoustic resonator effect ", in fact effect is unsatisfactory.
Deep low-frequency effect is built in AIWA earphone classics " flute pipe " design---and a lot of people thinks that " flute pipe " uses " Helmholtz resonator " principle, but in fact really not so.Sound pipe volume is much smaller than operatic tunes volume, could form " Helmholtz resonator ", and adopt the earphone that " flute pipe " designs, and sound pipe (flute pipe) volume is close to being even greater than the operatic tunes (earphone back cavity) volume---thus can not form " Helmholtz resonator ".
Dynamic iron earphone (Banlanced Armature) is generally closed earplug (In-Ear), and do not adopt semi open model/open to design with ear-shield type---mainly due to its structural limitations, and increase sealing can be raised the efficiency and LF-response, but due to " stethoscope effect ", health is poor.
Summary of the invention
The utility model object is that providing a kind of not easily causes the healthy earphone of auditory fatigue and hearing impairment---avoids " the stethoscope effect " of conventional earphone, lifting radiation efficiency/improve tone color.
The technical solution of the utility model---adopt the anti-type earphone of high radiation that ante-chamber is open, loud speaker front loads one " sound binding energy tube ", and the loud speaker back side is coupled with an acoustic compliance cavity; " sound binding energy tube " volume is greater than acoustic compliance cavity volume; " sound binding energy tube " is rigid material structure, comprises any one type in opposite sign cylinder and multiple bushing type, scroll casing type and spiral of Archimedes formula foldable structure.
Acoustic compliance cavity can adopt enclosed construction---and can also passive radiator be set, improves LF-response.
Radiation impedance Zr comprises radiation resistance Rr and the anti-Xr of radiation (Zr=Rr+jXr)---and radiation resistance (Rr) represents the ability of sound source to working medium radiation acoustic energy; Radiation anti-(Xr) representative " idle acoustic energy ", be stored near field, and non-radiating is gone out.It is generally acknowledged, radiation anti-(Xr) is " mass reactance " (Xm), i.e. " spurious radiation quality " (Mr)---and in fact, radiation is anti-also comprises " elastic reactance " (Xe)." mass reactance " is equivalent to induction reactance (X
l), " elastic reactance " is equivalent to capacitive reactance (X
c).
" air displacement " (V) that " mass reactance " (Xm) and speaker system are vibrated is directly proportional---" air displacement " (V) is relevant with body speed (u)---V ↑ → u ↑ → Wr ↑ (Wr=u
2za).
" air spring "---sound wave is compressional wave, air is Elastic medium, when propagating in atmosphere, (compression/expansion)---" air spring " coefficient of elasticity Km ↑ → radiation resistance Rr ↑ (potential energy → kinetic energy) " is held and becomes " in air vibration generation, compact part (Km ↑)-part of rarefaction (Rr ↑).Km ↑ → elastic reactance Xe (capacitive reactance X
c) ↑ → radiation resistance Rr ↑, then acoustic pressure Pa ↑ (Pa=uRr)/radiated Wr ↑ (Wr=u
2rr/2), acoustic radiation efficiency σ r increases---and Xr (Xe/Xm) represents potential energy, and Rr represents kinetic energy, and potential energy can be converted into kinetic energy.
Frequency f ↓ → wave number K ↓ → " air spring " coefficient of elasticity Km ↓ → radiation resistance Rr ↓ → Wr ↓---therefore " low frequency is more difficult than high frequency radiation ".
Horn loudspeaker (Horn loudspeakers) belongs to indirec radiation formula loud speaker---and the sound pipe that " horn " i.e. sectional area gradually changes is exactly in fact promote acoustic pressure Pa/ radiated Wr by increasing the anti-Xr of radiation (Xm/Xe)---therefore its efficiency is high.
Positive horn (Horn)---acoustic irradiation direction is from osculum end (throat) to big opening end (oral area);
Opposite sign cylinder (Inverse-horn)---acoustic irradiation direction is from big opening end to osculum end.
Although closed earphone---external auditory meatus sectional area S ↓ (radiation resistance Rr ↓), the anti-Xr of radiation (Xm/Xe) ↑ → acoustic pressure Pa ↑, therefore its Wr/ σ r ↑.
AIWA " flute pipe " designs low-frequency effect mainly because flute pipe adds the volume (continuity) of earphone back cavity---the anti-Xr of radiation ↑ → Pa/Wr ↑, low frequency radiation-efficiency improves, amount sense increases---and Mr (spurious radiation quality) increases, loud speaker fo reduces, and LF-response is improved.
" the anti-type earphone of high radiation " (the Large Xr mode Earphone)---hereinafter referred to as " LXEp ", " semi open model " can be adopted to design, be more suitable for " super near sound field " and listen to.With reference to Fig. 1.
LXEp adopts " sound binding energy tube " to increase the anti-Xr of radiation (Xm/Xe)---and " sound binding energy tube " (Acoustic Energy Gathered Pipe) is a kind of sound pipe with acoustic energy aggtegation, can increase acoustic pressure Pa, be kinetic energy by potential energy; Also can be potential energy storage by kinetic transformation.Preferably, " sound binding energy tube " adopts horn structure." sound binding energy tube " can also improve LF-response---mass reactance Xm ↑ → spurious radiation mass M r ↑ → harmonic frequency of loudspeakers fo ↓; Low-frequency sound wave elastic reactance Xe ↑ → " air spring " coefficient of elasticity Km ↑ → radiation resistance Rr ↑, make " low frequency radiation is easier ".
" sound binding energy tube " is actually one " sound pressure gain/compressor "---and can compensate acoustic pressure during small-signal, promote radiated (energy-conservation); When signal level improves, then can limit acoustic pressure, can bidirectional modulation acoustic pressure (Reservoir Effect)." sound binding energy tube " belongs to " distributed parameter system ", and radiation resistance Rr can produce " sympathetic response in parallel " with spurious radiation mass M r (Xm=ω Mr)/acoustic compliance Ce (Xe=1/ ω Ce)---be similar to λ/4 or λ/2 air column " standing wave " sympathetic response of wind instrument.
" substituting one thing for another "---LXEp replaces external auditory meatus with " sound binding energy tube ", play the same tune on different musical instruments with closed earphone (stethoscope effect), same efficiency is high/and distortion is little, and LF-response is good---but has more health, effectively can solve the contradiction of tonequality/between efficiency and health.
LXEp " semi open model " acoustic construction design (ante-chamber is open)---namely no matter adopt which kind of mechanical structure (as ear type/ear-shield type), earphone ante-chamber all keeps connected state with outside air, to avoid " stethoscope effect ".
---the vibrational system mass M m/ support system Cm of loud speaker is formed " series resonance " with back cavity acoustic compliance Ca/ acoustic resistance Ra (Rm/Rr)---the radiation resistance Rr of " sound binding energy tube " is formed " sympathetic response in parallel " with spurious radiation mass M r/ acoustic compliance Ce LXEp acousto-electro-mechanical analogue figure (with reference to Fig. 2), and semi open model structure and external auditory meatus acoustic compliance Ca ' are formed " open circuit ".
" in ear open sound field " (the Open mode Sound field inside ear)---LXEp " semi open model " designs sound field and mainly concentrates on auricle/external auditory meatus, and can expand to ear space outerpace; " binaural effect "/" Auricle effect " is remarkable, and " in head effect " is little, the broad nature of sound field.
" ear inside enclosed sound field " (the Closed mode Sound field inside ear)---traditional closed earphone sound field is then confined to ear inside (external auditory meatus), without " binaural effect "/" Auricle effect ", " in head effect " is obvious, and sound field is narrow/unnatural.
Different from general semi open model earphone (ante-chamber closes/back cavity opening)---LXEp " semi open model " designs and then adopts " ante-chamber is open " structure, can avoid " stethoscope effect ", therefore it has " green " (health).Can suitably increase back cavity volume, or offer gas port, increase acoustic compliance Ca, reduce acoustic impedance Za, reduce loud speaker fo, improve LF-response---and obtain a kind of dynamic " air pressure balance " (vibrating diaphragm), reduce distortion.
Further, as preferably---LXEp " sound binding energy tube " adopts opposite sign cylinder (Inverse-horn).Generally speaking, earphone ante-chamber volume V increases, and acoustic impedance Za/ acoustic stiffness Sa reduces, then loudspeaker high frequency upper limit fmax declines, and high frequency response is poor---and relative to positive horn, opposite sign cylinder Za/Sa is larger, and fmax improves, and high frequency response is good.
The design of general horn loudspeaker all adopts positive horn---and in fact, " the acoustic pressure controlling " of opposite sign cylinder is better than positive horn, when loudspeaker radiates acoustic pressure increases, can stabilize acoustic pressure, reduce energy-flux density (sound intensity I), have health.The relative confined space of opposite sign cylinder/tube wall reflection, can increase elastic reactance Xe; Acoustic impedance Za reduces gradually with sectional area S and increases, Xe ↑ → radiation resistance Rr ↑---then acoustic pressure Pa/ acoustic radiation efficiency σ r increases, its " supercharging " better effects if.
No matter positive horn or opposite sign cylinder, all inevitably generation " standing wave resonance "---can cause " sound coloration ", sound " sends out urn ", and the sound pressure level SPL of some frequency is improved, and frequency response curve is uneven.Relative to audio amplifier, earphone " horn " yardstick is little, and the tonequality deterioration that " standing wave resonance " sound coloration causes alleviates---and from this meaning, earphone is more suitable for adopting " sound binding energy tube " (maximizing favourable factors and minimizing unfavourable ones).In fact, although sound coloration does not meet tradition " Hi-Fi standard ", but process proper, just can " turn the foul and rotten into the rare and ethereal ", making sound more interesting to listen to---the harmonic energy of " sound binding energy tube " increases with harmonic number and weakens (being similar to courage machine) gradually, can obtain mellow/soft/pure and fresh tone color.
Designing different from the general earphone operatic tunes---LXEp " sound binding energy tube " (ante-chamber) volume is greater than acoustic compliance cavity (back cavity) volume, increases the anti-Xr of radiation, promotes radiation efficiency.Relative to general earphone ante-chamber---LXEp " sound binding energy tube " volume is larger, and Xr modal density increases, and shows " horn " loud speaker tone color glamour.LXEp " sound binding energy tube " and AIWA " flute pipe " play the same tune on different musical instruments---but " sound binding energy tube " loads on loud speaker front, except promoting low frequency, can also optimize tone color, promotes parsing power/knot image force; And the latter loads on the loud speaker back side, LF-response can only be improved.
Some " guided wave formula earphones " adopt flexible plastic pipe or rubber tube as phonocatheter, although also having increases radiation and resists/the effect of radiated, but its main purpose is to prevent electromagnetic radiation of mobile telephone---for improving acoustic propagation efficiency, generally all adopt seal phonocatheter/closed Headphone structure (being similar to stethoscope).LXEp " sound binding energy tube " then adopts the rigid material structures such as plastics/wooden/metal---" semi open model " acoustic construction design (ante-chamber is open), can avoid " stethoscope effect ".
LXEp " sound binding energy tube " can also adopt foldable structure---and similar to opposite sign cylinder effect, elastic reactance Xe can be increased by " elastic reactance supercharging " effect, improve radiation efficiency.Visual length reduction/physical length increases, and " formative nature " improves, and comprises ear type/ear-shield type.Same volume (mass reactance Xm is identical)---adopt foldable structure, because elastic reactance Xe increases, anti-Xr is larger in total radiation; And " λ/4 " resonance frequency fop also different (sound pipe length is different).Foldable structure can adopt wide structure (as spiral of Archimedes formula) or opposite sign barrel structure (as scroll casing type).
Multiple bushing type foldable structure (with reference to Fig. 3)---be similar to traditional collapsible horn speaker, multiple coaxial sound pipe (getting odd number) layer overlaps, and keep a determining deviation, adjacent two layers supports fixing by joint pin---and/other end opening is closed in sound pipe one end, and sectional area is identical or regularly change.
Scroll casing type (three-dimensional log spiral) foldable structure " sound binding energy tube "---big opening end is extended to circular loading loud speaker, and osculum end is outlet sound mouth, with reference to Fig. 4.Spiral of Archimedes (plane constant velocity spiral) formula foldable structure " sound binding energy tube "---big opening end is extended to circular loading loud speaker, and osculum end is outlet sound mouth (same to scroll casing type), and loud speaker is placed in the back side.The loud speaker of ear type also can be placed in side, with reference to Fig. 5.
LXEp foldable structure " sound binding energy tube " can adopt 3D printer (3D Printers) technology---and 3D prints and brings subversive manufacturing industry revolution, and without the need to machining or mould, its cost/accuracy and runtime is better than traditional manufacture.
The utility model has following beneficial effect
" fish and bear's paw can get both "---" high radiation anti-type earphone " LXEp both can obtain high efficiency/low distortion and good LF-response, can avoid again auditory fatigue/hearing impairment that closed earphone " stethoscope effect " causes.
LXEp has " green health "---effectively can solve the contradiction of conventional earphone tonequality/between efficiency and health.
" acoustic power amplifier " (Acoustical Power Amplifier)---LXEp can promote radiated Wr and acoustic radiation efficiency σ r, make full use of loud speaker just/the radiation acoustic energy at the back side---relative to electronic system power amplifier, more " green low-carbon ".
The sound field degree of depth/level increases " enable voice is more interesting to listen to " (horn type earphone)---design of LXEp ante-chamber adopts horn structure " sound binding energy tube ", has the sound advantage of traditional horn loudspeaker---, and parsing power/knot image force/telepresenc is good.
Outstanding selling point (moulding)---LXEp " sound binding energy tube " volume increases, and make earphone profile differ from routine, but this also can be space for industrial design provides---and health is more important after all, consumer should be understood that and acceptance.
Temper toughness with gentleness---LXEp " sound binding energy tube " can improve the tone color of dynamic iron earphone, make the sound of its " dry and astringent " become plump/alcohol and---breach the restriction that dynamic iron earphone cannot adopt " semi open model " structure.
Accompanying drawing explanation
Fig. 1 is LXEp structural representation
Fig. 2 is LXEp acousto-electro-mechanical analogue figure
Fig. 3 is multiple bushing type " sound binding energy tube " LXEp (ear-shield type)
Fig. 4 is scroll casing type " sound binding energy tube " structural representation (Fig. 4 A/ Fig. 4 B profile)
Fig. 5 is spiral of Archimedes formula " sound binding energy tube " ear type LXEp (Fig. 5 A/ Fig. 5 B)
Fig. 6 is LXEp semi open model ear phone structure schematic diagram (BA)
Fig. 7 is that LXEp shoulder holds formula support/location structure schematic diagram (Fig. 7 A/ Fig. 7 B)
Wherein---
1-loud speaker, 2-low frequency cell (BA), 3-medium-high frequency unit (BA), 4-entrant sound ear pad
5-acoustic compliance cavity (back cavity), 6-" sound binding energy tube ", 7-joint pin, 8-takes on frame, 9-backstay
Embodiment
" sound binding energy tube " can adopt index linear/hyperbola equal sign barrel structure---relative to positive horn, opposite sign barrel shape there is no strict restriction, tolerance is large, key to increase Xr (Xm/Xe)---/hyperbola linear relative to index, " tulip " shape opposite sign cylinder Xr ↑ (Xm ↑), better effects if.
Ear type LXEp " sound binding energy tube " can adopt opposite sign barrel structure---structure that ear-shield type LXEp " sound binding energy tube " can adopt " opposite sign cylinder+positive horn ".
LXEp semi open model earplug---be " non-In-Ear " design (auricle formula), to be stuck in auricle/but not fill in external auditory meatus, be different from " In-Ear " (duct-type), adopt rigid plastics/but not silica gel sheath---then can avoid " stethoscope effect ", improve health.Also can adopt " air guide type silica gel sheath "---silica gel sheath is concavo-convex alternate, and reduce sealing, external auditory meatus air pressure is declined, and its comfortableness/stability is better than the former.
LXEp semi open model earmuff---ear pad is " entrant sound " design, as adopted sponge material/offer gas port, to avoid " stethoscope effect "---while guarantee wearing comfort, improve health.
LXEp adopts full range speaker or multiple unit sub-frequency loudspeaker system---loud speaker can adopt coil-moving speaker, bending wave mode loudspeakers, electrostatic loudspeaker, piezo-electric loudspeaker or balanced armature type loudspeaker etc.
LXEp can adopt " bending wave mode loudspeakers " (BML)---and directive property is good, not easily causes auditory fatigue, is therefore suitable for earphone; " radiation of randomness vibration/dispersivity ", is suitable near sound field and listens to." sound binding energy tube " can improve its LF-response.
LXEp by " sound binding energy tube " design ap-plication in dynamic iron earphone, Pa/Wr/ σ r is promoted by increasing Xr, improve LF-response, then can adopt semi open model and ear-shield type structure (non-In-Ear)---thus avoid " stethoscope effect ", improve health.LXEp can make iron earphone (BA) when sealing reduces, and still keeps the advantage of high efficiency/high sensitivity/high parsing power---and " sound binding energy tube " can improve its LF-response, improves radiation efficiency σ r, recruitment sense.
Because dynamic iron unit volume is little, LXEp semi open model earplug/earmuff (BA) can adopt multiple unit frequency division to design---and with reference to Fig. 6, medium-high frequency unit (BA)/low frequency cell (BA) loads " sound binding energy tube ".The design that dynamic iron unit (BA) and moving-coil type unit (MC) combine can also be adopted, dynamic iron unit (BA) is medium-high frequency unit, and moving-coil type unit (MC) is low frequency cell---then can have complementary advantages (tone color/frequency response).Ear-shield type adopts entrant sound ear pad.
LXEp supports and should meet " ergonomics " requirement with locate mode, has health---and can adopt wear-type (ear-shield type), auricle brace type (ear type), rear mounted, neck hanging type or take on hanging etc.Wear-type and to be rear mountedly actually " clipping ", elastic force can produce constriction; Neck hanging type (rigid support type) is unfavorable for that cervical vertebra is healthy; Auricle brace type is only suitable for small dimension earphone (weight/volume is little).
" shoulder holds formula " supports and location structure---because " sound binding energy tube " makes weight/volume increase, being necessary that the new supporting and location system of exploitation adapts with it---backstay can adopt metal gooseneck, there is sufficient intensity and support earphone, and can random adjusting angle (plasticity), freedom and flexibility---relative to clamp structures such as wear-types, not easily cause " inhibition effect " (head/ear's meridian qi and blood is inaccessible).With reference to Fig. 7---shoulder frame (8) load-bearing, and keep certain distance with cervical vertebra, backstay (9) makes LXEp be positioned auricle.
Claims (3)
1. the anti-type earphone of high radiation, ante-chamber is open, it is characterized in that
Loud speaker front loads one " sound binding energy tube ", and the loud speaker back side is coupled with an acoustic compliance cavity;
Described " sound binding energy tube " volume is greater than acoustic compliance cavity volume;
Described " sound binding energy tube " is rigid material structure, comprises opposite sign cylinder, and
Any one type in multiple bushing type, scroll casing type and spiral of Archimedes formula foldable structure.
2. the anti-type earphone of high radiation according to claim 1, is characterized in that
Described loud speaker comprises
Any one type in coil-moving speaker, bending wave mode loudspeakers, electrostatic loudspeaker, piezo-electric loudspeaker and balanced armature type loudspeaker.
3. the anti-type earphone of high radiation according to claim 1 and 2, is characterized in that
Adopt shoulder formula of holding to support and location structure, backstay adopts metal gooseneck.
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| CN201520046969.2U CN204518013U (en) | 2015-01-22 | 2015-01-22 | The anti-type earphone of high radiation |
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| CN201520046969.2U CN204518013U (en) | 2015-01-22 | 2015-01-22 | The anti-type earphone of high radiation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107547992A (en) * | 2016-06-29 | 2018-01-05 | 宏碁股份有限公司 | Low-frequency extended loudspeaker and electronic device using same |
| CN110191386A (en) * | 2019-05-31 | 2019-08-30 | 歌尔科技有限公司 | A kind of external earphone |
| WO2024016401A1 (en) * | 2022-07-19 | 2024-01-25 | 瑞声科技(新加坡)有限公司 | Loudspeaker module |
-
2015
- 2015-01-22 CN CN201520046969.2U patent/CN204518013U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107547992A (en) * | 2016-06-29 | 2018-01-05 | 宏碁股份有限公司 | Low-frequency extended loudspeaker and electronic device using same |
| CN110191386A (en) * | 2019-05-31 | 2019-08-30 | 歌尔科技有限公司 | A kind of external earphone |
| CN110191386B (en) * | 2019-05-31 | 2021-03-19 | 歌尔科技有限公司 | External earphone |
| WO2024016401A1 (en) * | 2022-07-19 | 2024-01-25 | 瑞声科技(新加坡)有限公司 | Loudspeaker module |
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