CN101595738A - Acoustic attenuation earmuff with isolated duplex shell structure - Google Patents
Acoustic attenuation earmuff with isolated duplex shell structure Download PDFInfo
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- CN101595738A CN101595738A CNA2007800505396A CN200780050539A CN101595738A CN 101595738 A CN101595738 A CN 101595738A CN A2007800505396 A CNA2007800505396 A CN A2007800505396A CN 200780050539 A CN200780050539 A CN 200780050539A CN 101595738 A CN101595738 A CN 101595738A
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Abstract
A kind of earmuff assemblies with duplex shell structure of using with the acoustic attenuation headphone of being used for is disclosed.This earmuff assemblies comprises and is installed in the cup-shaped shell on the elasticity outer seal ring and is installed in cup-shaped inner casing on the elasticity inner seal ring.Shell and inner casing form adjacency by the head surface around two sealing rings and wearer's the ear.Two shells structurally are rigidity.By inner casing and shell isolation are made the sound attenuation performance maximization.Two sealing rings pass through the thin list layer interconnection of soft compliant material, and this thin list layer is as the vibration isolation/decoupling zero device between shell and the inner casing.
Description
The cross reference of related application
[1] the application requires the priority of the provisional application 60/872,669 of submission on December 4th, 2006.For all purposes, this 60/872,669 application all is combined in this, as a reference.
Technical field
[2] disclosure relates in general to the earmuff with the ear cup that is suitable for use as the wear-type hearing protectors.More specifically, this openly relates to the earmuff that comprises the ears cup, one of them cup be positioned at fully in another ear cup and with this another ear cup mechanical isolation, and relate to and be used for the ear sealing that earmuff therewith uses together.
Background technology
[3] the wear-type ear shield device is often used in undesirable sound level and is higher than the protection of avoiding hearing impairment or hearing loss in the noisy environment of safety margin.Compare with hearing protectors such as other type of earplug; earmuff (promptly; the wear-type earmuff) in using, is preferred usually as single hearing protection of main hearing protection because that they are easy to wear off, decay is reliable, the training to the user, technical ability and motivation have less dependence, to the less sensitivity of assembling and the fexible unit that can wear as single-size.Ear shield device well known in the prior art generally comprises a pair of ear cup of being made by firm plastic material.Each ear cup normally single wall and be lined with acoustical material in inside to help to weaken and absorb acoustic energy.Two ear cups are installed on the end of spring-like headband, and this headband provides clamping force to contact with wearer's head to keep ear cup.To have annular concentric and have certain thickness soft ear pad (that is, ear sealing) and insert between ear cup and wearer's the head, be used for comfortable purpose and ideally, form gas-tight seal on every side at ear.The developer constantly pursues maximum acoustic attenuation ability so that the best protection to Noise Exposure to be provided.
[4] such as the sound wave below the 1000Hz kept burning day and night show than the big lower frequency of the size of earmuff under, as by the rigid mass of cushion against wearer's head vibration, the ear cup in the earmuff assemblies is by the acoustic energy displacement.That is to say, under the low frequency that is in proportion of acoustic pressure under ear cup and ear cup displacement, this ear cup can be used as single-degree-of-freedom (SDOF) vibrational system.Therefore, under low-frequency range, the sound attenuation performance of earmuff assemblies depends on ear cup volume, quality, headband clamping force and cushion stiffness substantially.In the mass/volume by increasing cup with increase the headband clamping force and improve the ear shield device of the above-mentioned type with the assembling of fastening ear pad and the rigidity that improves pad, the acoustic attenuation aspect that promptly has the earmuff of single-walled cup has been made a lot of trials.
[5] such as 1000Hz under above upper frequency, sound wave length become with the earmuff size quite or even less than the earmuff size, the beam mode of ear cup is subjected to the excitation of acoustic energy.The sound attenuation performance of earmuff is mainly determined by the rigidity of structure and by the acoustic resonance in ear cup and wearer's the chamber that surrounds then.Therefore, made much the trial that the acoustic damping of the rigidity of structure by increasing cup and/or cup inboard, chamber improves the high frequency sound attenuation performance of ear shield device.In addition, a lot of other trials have also been made aspect earmuff comfortableness and the minimum air leakage increasing by the various ear Seal Design that are used for using with the earmuff that particularly has single-walled cup.
[6] although these trials may cause certain raising of decaying, but owing to increase quality, volume and the headband clamping force of cup, raising liner rigidity is also carried out structure to cup and is strengthened having reduced comfortable grade usually, so the raising of the decay that causes thus is subjected to the actual consideration restriction of comfortableness aspect.The raising of the decay that causes thus in addition, also is subjected to the physics law relevant with the ear cover structure with single-walled cup and limits.The acoustic attenuation that is provided by earmuff is for being generally 10-30dB such as the lower frequency below the 1000Hz, and for being 25-40dB such as the upper frequency more than the 1000Hz.For some environment, near the jet engine of the military affairs of the very high acoustic attenuation of ear shield device and commercial aircraft and the very industry or the manufactory of confused noise, these classes of attenuation may be not enough such as expectation.
Summary of the invention
[7] therefore, a kind of new earmuff design is useful, compares with other wear-type earmuff of similar type well known in the prior art, and this earmuff design can not only provide obvious improved sound attenuation performance, can also use for reality enough comfortablenesses are provided.
[8] according to an embodiment, a kind of acoustic attenuation earmuff assemblies is provided, this acoustic attenuation earmuff assemblies comprises and is installed in the cup-shaped shell on the elasticity outer seal ring and is installed in cup-shaped inner casing on the elasticity inner seal ring.Two shells are by the engineering material of structural rigidity, and for example plastics are made.Two sealing rings pass through the thin list layer interconnection of soft compliant material.Shell is provided with the device that is used for earmuff assemblies is installed to headband.Air gap is limited between the outer surface of the inner surface of shell and inner casing.In one embodiment, inner casing is hanging to shell by the elastic insert that is arranged in air gap.In another embodiment, this elastic insert is removed so that the mechanical connection path between inner casing and the shell minimizes, and stays two flexible thin between the sealing ring and be the unique mechanical connection between inner casing and the shell.
[9], directly cause the external noise of the vibration in the shell to be weakened significantly and more effective than the situation of single-walled earmuff because the isolated duplex shell structure of earmuff.Its reason has two aspects.The first, isolated duplex shell structure is as two degrees of freedom (DOF) vibrational system.Under the frequency more than the system resonance, the vibration attenuation rate that is provided by the single-walled earmuff structure is provided coupled system, and this single-walled earmuff structure can be considered to the single-degree of freedom vibration system.Based on the actual parameter of traditional earmuff, the system resonance frequency of single-walled earmuff well known in the prior art or bivalve earmuff disclosed herein is usually less than 400Hz.This means, compare with traditional single-walled earmuff, more than the 400Hz under the frequency of about 1000Hz the bivalve earmuff can improve sound attenuation performance significantly because the sound attenuation performance of ear shield device is directly proportional with vibration level corresponding to the rigid motion of earmuff in this frequency range.The second, existing in of the air gap between shell and the inner casing provides the acoustic impedance mismatch in the mobile route, and this provides the reinforcement sound insulation to the external noise infiltration.This effect for example＞the most effective under the high frequency of 1000Hz.
[10], provide a kind of resilient ear seal that is particularly suitable for comprising the earmuff of two cup-shaped shell, the inner seal ring that this resilient ear seal comprises the outer seal ring of the shell that is suitable for supporting earmuff and is suitable for supporting the inner casing of earmuff according to another embodiment.Each sealing ring comprises circumferential lateral surface, interior all sides of opening are provided around wearer's ear, be used for sealing ring is fixed to the annular exposure of the annular fixed head and the head that be suitable for relative with this fixed head contacts the wearer of respective shell.On the one hand, two sealing rings link to each other by flexible thin, and this flexible thin has the hole to allow air-flow; On the other hand, because by shell and the vibration that provides of attached outer seal ring since the negligible shear stiffness of flexible thin and can not by this flexible thin be delivered to inner seal ring and attached inner casing, so two sealing rings are also by the flexible thin mechanical isolation.In one embodiment, in earmuff assemblies, this flexible thin prevents that inner casing from coming off from shell.In another embodiment, when the user put on earmuff, the flexible thin that stretches in the service position provided clamping force to contact with wearer's head to keep inner casing to inner casing.
Description of drawings
[11] Fig. 1 shows the acoustic attenuation earmuff assemblies of prior art, this acoustic attenuation earmuff assemblies comprise be installed on the headband, the sound foam insert of liner and be located in cup-shaped rigid crust in the monocycle ear sealing.
[12] Fig. 2 shows the acoustic attenuation earmuff assemblies according to an embodiment, and this acoustic attenuation earmuff assemblies comprises two rigid crusts, wherein inner casing by the sealing of foam spacer and ear fully the location in the enclosure and with the shell mechanical isolation.
[13] Fig. 3 shows the simplification model of vibration according to an embodiment, and this model of vibration is equivalent to the acoustic attenuation earmuff assemblies shown in Fig. 2 and is suitable under the about frequency below the 1000Hz theoretical fade performance is compared with the fade performance of known single-walled earmuff.
[14] Fig. 4 is the diagram of comparing with the fade performance of the earmuff with single wall shell structure according to the theoretical fade performance of the earmuff assemblies of the isolated duplex shell structure of an embodiment having.
[15] Fig. 5 A and Fig. 5 B show cutaway view and the vertical view according to the detailed structure of the ear of embodiment shown in Fig. 2 sealing.
[16] Fig. 5 C shows the amplification view according to the outer seal ring that comprises flexible shroud and " L " shape rigid fixation plate of an embodiment.
[17] Fig. 5 D shows the ear sealing according to embodiment shown in Fig. 5 A, and flexible thin is attached to two sealing rings in the position of the opening surface of close sealing ring here.
[18] Fig. 6 A and Fig. 6 B show the embodiment that is used for the ear sealing is attached to two rigid crusts.
[19] Fig. 7 is and the diagram according to test Real-EAR-At-Attenuation (REAT) (the true hearing under the decay) data of the earmuff of embodiment shown in Fig. 2 structure of comparing by the known large volume earmuff with single-wall structure of prior art.
[20] Fig. 8 shows the acoustic attenuation earmuff assemblies according to an embodiment, and this acoustic attenuation earmuff assemblies comprises two rigid crusts, wherein inner casing by ear sealing fully the location in the enclosure and with the shell mechanical isolation.
[21] Fig. 9 shows the cutaway view of detailed structure of the ear sealing of embodiment shown in Fig. 8.
[22] Figure 10 A and Figure 10 B show the free body diagram of the body seal minor structure located equilbrium position (that is the load situation on wearer's head) according to being in of embodiment and inner casing sealing minor structure.
Embodiment
[23] Fig. 1 has shown the disclosed in the prior art cutaway view that comprises the earmuff assemblies 000 of the single-walled cup that is used for block sound usually.Single-walled cup 004 be rigidity and be installed to headband 005 by installing mechanism such as pivotal pin 006.Single-walled cup 004 is lined with one deck sound foam insert 007 in going back.Comprise that the annular ear sealing 001 of flexible shroud 002 is fixed to the outer peripheral edges of single-walled cup 004 by the fastener such as fixed head 003.Annular flexible sheath 002 encapsulation padded coaming, for example soft foam, silica gel or both combinations and be in described material is communicated with.When being put on, ear sealing 001 is compressed under the static clamping force that is provided by headband 005, is in wearer's ear head surface on every side with maintenance to contact.Therefore, between ear and external noise source, form barrier.For the purpose of clear, the earmuff that will have the single wall ear cup herein is called " traditional earmuff ".Similarly, will mainly be designed for traditional earmuff herein and use and comprise that the ear sealing of single sealing ring is called " traditional ear sealing ".
[24] use the method for subjective testing of describing by ansi standard S3.19-1974 to come the sound attenuation performance of earmuff is assessed usually.Those of skill in the art will understand, according to ANSIS3.19-1974, the average attenuation scope that is provided by traditional earmuff is generally 10-30dB under such as the lower frequency below the 1000Hz, and is generally 25-40dB under such as the upper frequency more than the 1000Hz.
[25] acoustic attenuation earmuff assemblies 100 illustrates with an exemplary embodiment in Fig. 2.This earmuff assemblies 100 comprises cup-shaped rigid shells 104, rigid inner shell 107 and resilient ear seal 101.Each cup-shaped shell comprises three surfaces: when earmuff assemblies is put on towards the inner surface of wearer's head, and this inner surface opposed outer surface and the side face that between the periphery of outer surface and inner surface, extends.Shell and inner casing all can be made by plastic material, however this and do not mean that a kind of restriction.Resilient ear seal 101 comprises outer seal ring 103 and the inner seal ring 102 by flexible thin 110 interconnection.Outer seal ring 103 is respectively fixed to the side face of shell 104 and inner casing 107 with inner seal ring 102 and extends to contact with wearer's head from described rigid crust.In earmuff assemblies 100, flexible thin 110 is as vibration isolation/decoupling zero (decoupling) device, in order to the vibration between isolation/decoupling zero inner casing 107 and the shell 104.Earmuff assemblies 100 can any desired mode, for example be installed to headband 105 by the pivotal pin on the lateral surface that is attached to outer rigid housing 104 108.In one embodiment, the erecting device between earmuff assemblies 100 and the headband 105 allows earmuff assemblies 100 to pivot or rotation with respect to headband 105, is used for as best located and maximum comfortableness by wearer's adjusting and perception.When being in load condition, when promptly the head that is worn on the wearer when earmuff assemblies 100 was gone up, the headband 105 that is worn over around the head provided static clamping force to be in suitable position to keep earmuff assemblies 100.
[26] in the embodiment shown in Fig. 2, rigid inner shell 107 fully is positioned in the outer rigid housing 104.Between the outer surface of the inner surface of outer rigid housing 104 and rigid inner shell 107, form intermediate air gap 112 then.In addition, rigid inner shell 107 is by foam locating ring (spacer ring) 109 and placed in the middle in outer rigid housing 104, and the tapered profiles that passes through rigid inner shell 107 limits, and making progress slides and seal 101 by ear limits to lower slider, this foam locating ring 109 comprises foamed material, but this and do not mean that qualification.Want the vibration between two rigid crusts of decoupling zero, inner casing 107 and shell 104 are configured to foam locating ring 109 is not compressed to load condition.Adopt continuous foam locating ring that rigid inner shell 107 is positioned in the outer rigid housing 104 although will be appreciated that these specific embodiments, this does not also mean that qualification.For example, can use with separation pitch and replace foam locating ring 109 along a plurality of cushions of the analog material of rigid inner shell 107 circumferential arrangement.Alternately, the available one deck foamed material that is arranged in the air gap 112 replaces foam locating ring 109.Because between locating ring 109 side direction insertion outer rigid housing 104 and the rigid inner shell 107 and not by outer rigid housing 104 and rigid inner shell 107 compressions, so it can be with the headband clamping force or (vertically, as shown in Figure 2) vibration of the rigid body of the Noise Excitation of direction is passed to rigid inner shell 107 from outer rigid housing 104 vertically.On the other hand, provide maximum acoustic attenuation, outer rigid housing 104 all is configured to keep closely contacting with wearer's the circumferential of head by the clamping force that is provided by headband 105 with rigid inner shell 107.
[27], in order on rigid inner shell 107, to apply static clamping force, be arranged in elastomeric connector 106 in the intermediate air gap 112 between outer rigid housing 104 and the rigid inner shell 107 and be arranged on the vertical axis of two rigid crusts according to an embodiment.Elastomeric connector 106 comprises two ends, and wherein first end (i.e. top as shown in Figure 2) is suitable for contacting the inner surface of shell 104, and second end (i.e. bottom as shown in Figure 2) is suitable for contacting the outer surface of inner casing 107.In load condition, the clamping force that is provided by headband 105 promotes shell 104 and outer seal ring 103 towards wearer's head.Shell 104 promotes first end of elastomeric connectors 106 and towards its second end elasticity of compression connector 106 that links to each other with inner casing 107 then.In load condition, when the headband power that is provided by headband 105 offseted by the reaction force that acts on the reaction force on the outer seal ring 103 and produced by it when elastomeric connector 106 is compressed, this condensing routine finished.Then, the described reaction force that is produced by elastomeric connector 106 promotes inner casing 107 and inner seal ring 102 as static clamping force in order to the head towards the wearer.In another embodiment, elastomeric connector 106 is made by elastomeric material, depends on load condition, i.e. compression ratio, and described elastomeric material has the rigidity of two-stage at least.For example, in the starting stage, when elastomeric connector 106 when compressing within a certain percentage from its first end to its measured original length of its second end, elastomeric connector 106 presents higher rigidity value.After this starting stage, when elastomeric connector 106 is further compressed to the second level, elastomeric connector 106 present less than with the rigidity value that is lower than at least in the starting stage.High rigidity in starting stage guarantees in load condition, and when elastomeric connector 106 was preferably compressed to the second level, elastomeric connector 106 can provide the tight static clamping force that contacts between the head that is enough to keep inner seal ring 102 and wearer.Yet, when being exposed to external noise, except since the dead load of clamping force, the interconnection liner 106 also encouraged by dynamic loading.In this case, need in vibration isolation system, use usually and hang down rigid spring, so the low rigidity value of elastomeric connector 106 helps to isolate/vibration between decoupling zero shell 104 and the inner casing 107 because validity is isolated in high vibration.
[28] elastomeric connector 106 is used so that inner casing 107 is isolated with shell 104 as the vibration isolation/decoupling zero device in the earmuff assemblies 100.In one embodiment, elastomeric connector 106 is the interconnection liners that are made of the polyurethane-base flexible foam, the strain-stress relation of this foamed material, and promptly rigidity is non-linear and depends on load condition.Under various compression ratios, this foamed material has three grades of rigidity values.When being compressed less than 10-15%, it presents high rigidity usually.In this compression percentage range, foamed material has the good dead load of bearing, the i.e. ability of headband clamping force.When compression ratio was between 10% and 40%, foamed material presented low rigidity, and this isolates for vibration is desirable.When foam be compressed above its original thickness 40% the time, its rigidity uprises again.The characteristic of preceding two-stage has material impact in the elastomeric connector 106 that comprises the aforesaid interconnection liner of being made by the polyurethane-base flexible foam with non-linear rigidity characteristic, thereby in load condition, this interconnection liner is compressed at least 10% by inner casing 107 and shell 104, but is no more than 40%.Yet, surpasses 40% compression and will give some decay, thereby this scope is not to limit, and only be an exemplary embodiment.In addition, other material also can be used for the liner that interconnects, and these materials can have different compression properties, thereby may have the compression zone different with polyurethane foam.In other embodiments, elastomeric connector 106 can be spring or elastomer connector.
[29] put on when earmuff assemblies 100, when promptly being in the load condition, wearer's ear is enclosed in the chamber 113 that the rigid inner shell 107 by the sound foam insert 111 of liner limits.Foam insert 111 with suitable thickness harmony absorbability will help to weaken the acoustic energy of the operatic tunes 113 inboards, particularly under higher frequency, as disclosed in the prior art.Outer seal ring 103 with attached outer rigid housing 104 contact by the headband force compresses and with wearer's head surface to form the ground floor sealing around the ear.The part that acts on the headband power on the outer rigid housing 104 then is delivered to rigid inner shell 107 by elastomeric connector 106, and thereby is delivered to inner seal ring 102 to form second layer sealing around ear.Therefore, between ear and external noise source, formed baffle.To understand as those of skill in the art, and can use in theory to be suitable for calculating ear shield device and to come being defined as the acoustic pressure p of 113 inboards, chamber at model of vibration such as the acoustic attenuation under the low frequency below the 1000Hz
iExternal sound pressure p with earmuff assemblies 100
oThe pressure transmissibility (that is the reverse side of common employed term-sound attenuation performance) of ratio predict.
[30] Fig. 3 shows the simplification model of vibration with the acoustic attenuation earmuff assemblies equivalence shown in Fig. 2.The gross mass quality m of outer rigid crust 104 and outer seal ring 103
1Expression, and the gross mass quality m of interior rigid crust 107 and inner seal ring 102
2Expression.Quality m
1By having the constant k that is associated with outer seal ring 103 and corresponding air spring
1With damping coefficient c
1Spring be installed to the expression wearer the head rigid foundation.Similarly, quality m
2By having the constant k that is associated with inner seal ring 102 and corresponding air spring
2With damping coefficient c
2Spring be installed to rigid foundation.Because so elastomeric connector 106 is quality m
2Also by having rigidity k
iWith damping coefficient c
iMiddle springs be elastically connected to quality m
1k
iAnd c
iActual value mainly determine by the character of elastomeric connector 106.Yet the spring rate of air gap 112 and damping are also to k
iAnd c
iWork.The regional s of the cross section by acting on outer rigid housing 104
oOn external sound pressure p
oThe exciting force f that produces
oMake quality m
1Vibration.Quality m
1Vibration again by by k
iAnd c
iThe mechanical impedance of expression is delivered to quality m
2Quality m
1With quality m
2Displacement in Fig. 3, be expressed as x respectively
1And x
2According to this model, in the chamber 113 and thereby by the acoustic pressure p of wearer's ear perception
iWith displacement x
2Size be directly proportional.
[31] Fig. 4 compares the pressure transmissibility of the various situations of the model of vibration shown in use Fig. 3.Because the limitation of model, these more only are to make under the frequency below the 1000Hz.Solid line by the indication of the L1 among Fig. 4 is the theoretical pressure transmissibility with the earmuff of isolating duplex shell structure that has as shown in Figure 2.With employed parameter in this curve of prediction be chosen as practical and to some prior art used similar.Pressure transmissibility curve L1 can be compared with the pressure transmissibility curve of traditional earmuff, this tradition earmuff has identical quality, volume and buffering character with the earmuff of being represented by L1.This traditional earmuff is called " reference " earmuff herein, it is realized as follows: (a) remove inner casing 107 and elastomeric connector 106 from the earmuff assemblies shown in Fig. 2 100, (b) add the quality of former inner casing 107 to shell 104, make the quality of single-walled cup of reference earmuff equal the gross mass of inner casing 107 and shell 104, and (c) inner seal ring 102 and outer seal ring 103 are merged into the single sealing ring that is fixed to shell 104, make the rigidity of sealing ring of reference earmuff be inner seal ring 102 of the present invention and outer seal ring 103 rigidity and, and the damping coefficient of the sealing ring of reference earmuff is identical with outer seal ring 103.
[32] the theoretical pressure transmissibility of reference earmuff is predicted as the dotted line by the L2 indication in Fig. 4.According to model of vibration, with the corresponding transmissibility curve of the pattern of oscillating mass on have resonance peak.For curve L1, owing to have two oscillating mass, i.e. quality m
1With quality m
2So, observe two resonance peaks (about 110 and the 250Hz place).For curve L2, owing to only have an oscillating mass, its weight equals m
1And m
2Total weight, so observe a resonance peak (at about 120Hz place).100 and 250Hz between resonance range below, the transmission rate variance between curve L1 and the curve L2 is almost constant, wherein, L1 is lower than L2 slightly.In resonance range, the L1 of place is lower than L2 in most of frequency, and just near the L1 of frequency place the highest resonance peak at about 250Hz place is higher than L2.Surpass resonance range, the acoustic attenuation rate of being represented by curve L1 is far above the acoustic attenuation rate of the reference earmuff of being represented by curve L2.
[33] in addition, at the frequency place that is higher than 1000Hz that the sound attenuation performance of wear-type earmuff is mainly determined by the flexural vibrations of cup-shaped shell, the earmuff assemblies shown in Fig. 2 also provides improved decay.This be because the flexural vibrations of the shell 104 by the external noise field excitation because the impedance mismatching between intermediate air gap 112 and shell 104 and the inner casing 107 and can not be delivered to inner casing 107 by intermediate air gap 112 effectively.Thereby by the amplitude of vibration of the rigid body of inner casing 107 and flexural vibrations is reduced to minimum and make the sound attenuation performance maximization in wide frequency ranges, thereby the sound level of 113 inboards, chamber that will surround wearer's ear is reduced to minimum.
[34] except middle springs rigidity used in calculated curve L3 is half of value used among the calculated curve L1, be the pressure transmissibility of the situation identical with L1 by the dash line shown in the L3 among Fig. 3.Curve L3 is compared with curve L1, can see that sound attenuation performance is further improved when middle spring rate reduces.In one embodiment, the volume that surrounds by inner casing 107 the volume that surrounds by shell 104 60% to 85% between.
[35] Fig. 5 A and Fig. 5 B show the cutaway view and the vertical view of the detailed structure of the ear sealing in the earmuff assemblies 100 that is combined in as shown in Figure 2 respectively.With reference to accompanying drawing and as example and non-limiting, this ear sealing comprises concentric locating and the elasticity outer seal ring 103 and the elasticity inner seal ring 102 that interconnect by annular flexible thin 110, in earmuff assemblies 100, this top layer 110 is also as the vibration isolation/decoupling zero device between inner casing and the shell.Because outer seal ring 103 is identical with the structure of inner seal ring 102, so for the purpose of example, Fig. 5 C only shows the amplification view of outer seal ring.Annular outer seal ring 103 comprises first flexible shroud 002 and first rigid fixation plate 207.This first flexible shroud is made and is filled with padded coaming 211 usually and contacts with this padded coaming 211 by soft compliant material.This padded coaming can be foam or silicon compound or both combinations.Those of skill in the art will understand, and other padded coaming also can be suitable for this purposes.First flexible shroud has the cross section of basic rectangle and has four surfaces: be suitable for contacting the annular exposure 204 of wearer's head, relative with this annular exposure annular base, lateral surface 205 and the medial surface 206 that engage with first rigid fixation plate 207 (Fig. 5 A) of being suitable for.The cross section that " L " shape was made and had to first rigid fixation plate 207 (Fig. 5 A) by firm plastic material usually.First fixed head 207 (Fig. 5 A) is provided with basal plane, and this basal plane is suitable for cooperating and being attached to by the means such as adhesive, high-frequency welding or thermoforming with the basal plane of first flexible shroud basal plane of first flexible shroud.First rigid fixation plate 207 (Fig. 5 A) also is provided with adjacent with its basal plane and the vertical scope of freedom 403 that extend between upper peripheral edge 402 and lower periphery 401.
[36] referring again to Fig. 5 A, circumferential recess 209 with the vertical scope of freedom facing surfaces of first rigid fixation plate 207 on, the protuberance on the outer peripheral edges of this circumferential recess 209 and shell 104 cooperates and is used for outer seal ring 103 is fixed to shell 104.Ring-type inner seal ring 102 comprises the second flexible shroud (not shown) and second rigid fixation plate 208 that is equivalent to first flexible shroud 002 (Fig. 5 C).Second flexible shroud is made and is filled with padded coaming 212 usually and contacts with this padded coaming 212 by soft compliant material.This padded coaming 212 can be foam or silicon compound or both combinations and not necessarily identical with padded coaming 211.Second flexible shroud has the cross section of basic rectangle and has four surfaces: be suitable for contacting the annular exposure 202 of wearer's head, relative with this annular exposure annular base, lateral surface 203 and the medial surface 201 that engage with second rigid fixation plate 208 of being suitable for.The cross section that " L " shape was made and had to second rigid fixation plate 208 by firm plastic material usually.Second fixed head 208 is provided with basal plane, and this basal plane is suitable for cooperating and being attached to by the means such as adhesive, high-frequency welding or thermoforming with the basal plane of second flexible shroud basal plane of second flexible shroud.The corresponding vertical scope of freedom (not shown in Fig. 5 C) that second rigid fixation plate 208 is directly arranged in the face of the vertical scope of freedom 403 of first rigid fixation plate 207, the adjacent and extension between upper peripheral edge and lower periphery (two edges are not all shown in Fig. 5 C) of the basal plane of this vertical scope of freedom and second rigid fixation plate 208.With the vertical scope of freedom facing surfaces of second rigid fixation plate 208 on circumferential recess 210 is arranged, the protuberance on the outer peripheral edges of this circumferential recess 210 and inner casing 107 cooperates and is used for inner seal ring 102 is fixed to inner casing 107.
[37] with reference to Fig. 5 A, the vertical scope of freedom of the medial surface 206 of first flexible shroud and first fixed head 207 forms the inner peripheral surface of outer seal ring 103.Similarly, the vertical scope of freedom of the lateral surface 203 of second flexible shroud and second fixed head 208 forms the outer peripheral face of inner seal ring 102.At last, inner seal ring 102 and outer seal ring 103 are by flexible thin 110 interconnection, and this top layer 110 comprises the outer peripheral edges at the inner peripheral surface place that ends at outer seal ring 103 and the inner peripheral that ends at the outer peripheral face place of inner seal ring 102.Here flexible thin 110 is set to (a) inner casing 107 is remained in the shell 104 forming whole earmuff assemblies, and (b) provide flexibly connect with between isolation/decoupling zero shell 104 and the inner casing 107 along the vibration force of vertical axis direction or move.
[38] in the assembling position as shown in Fig. 5 A, inner seal ring 102 and outer seal ring 103 circumferentially spaceds are apart from d.In one embodiment, the scope of d is from 2mm to 5mm.If d is too little, then may not have enough gaps to guarantee: during the oscillating movement that is caused by external noise, inner seal ring-inner casing minor structure does not contact outer seal ring-shell minor structure.On the other hand, cause the large-size of outer seal ring 103 greater than the d of described scope, and this makes it be difficult to realize good sealing, because more away from the central authorities of duct, it is irregular more that the profile of head surface becomes.In another embodiment, the amount of the big h of height of the aspect ratio inner seal ring 102 of outer seal ring 103.Thereby h represents the exposure of first or second flexible shroud and the distance between the corresponding basal plane.In another embodiment, the profile of the head surface around the ear, h 0 and 10mm between circumferentially change.For example, be positioned at before the ear towards the part of the head surface of wearer's face for contact, h can be 0, and is positioned at after the ear towards the part of the head surface of wearer's nape for contact, and h can have higher value.
[39] in another embodiment shown in Fig. 5 A, flexible thin 110 is attached in order at the inner peripheral of the basal plane of first flexible shroud (promptly, the edge that has between basal plane and the medial surface) and between the outer peripheral edges of the basal plane of second flexible shroud (that is the edge that has between basal plane and the lateral surface) extend.This attached means realization of passing through such as any desired of adhesive or thermoforming.In one embodiment, the width of flexible thin 110 equals 1.5 times of tension force to prevent to produce in flexible thin 110 owing to the relative vibration of shell 104 and inner casing 107 apart from d at least.In another embodiment, flexible thin 110 has the hole 213 of circumferential distribution, be pressed towards when earmuff assemblies 100 wearer the time, the air that allow to be collected in the air gap 112 are overflowed.For similar reason, inner seal ring 102 and outer seal ring 103 are equipped with at least one and are used for the air vent hole that pressure discharges.
[40] Fig. 5 D shows another embodiment of the ear sealing of using in earmuff assemblies 100 as shown in fig. 1, wherein, the inner peripheral of flexible thin 110 is alternately to be attached to the lateral surface 203 of second flexible shroud with interior distance away from the exposure 2023mm of second flexible shroud.Then the outer peripheral edges of flexible thin 110 are attached to the medial surface 206 of first flexible shroud, make flexible thin 110 parallel with the exposure 202 of second flexible shroud.As shown in Figure 3 model of vibration adopted, in fact wearer's head surface can be similar to the rigid foundation of not bearing vibration.Therefore, in load condition, keep also not vibrating with wearer's a inner seal ring 102 that contacts and the exposure (202 and 204) of outer seal ring 103.This means on the exposure of inner seal ring 102 and outer seal ring 103 the position or near the position of described exposure, between inner seal ring 102 and outer seal ring 103, there is not or almost do not have relative motion, if therefore flexible thin 110 is attached at the position near the exposure (202 and 204) of sealing ring, then in this flexible thin 110, can not produce tension force.This means again can use such flexible thin, and promptly this flexible thin has with identical by the width of d indication or less than the width of this width.The less width of flexible thin 110 will help to reduce the size of outer seal ring, thereby can realize the better seal quality.As previously described, this is because near the ear place, and the surface of head is near the plane and be sealed to the plane ratio to be sealed to irregular surface easier.
[41] carry out necessary replacement for sealing ear during use, two sealing rings of ear sealing should not be permanently affixed to corresponding rigid crust.Fig. 6 A and 6B show two kinds of feasible embodiment that are used for the ear sealing is attached to two rigid crusts.In Fig. 6 A, the vertical portion that will be cut into internal fixation plate 208 and external fixation plate 207 respectively by the circumferential recess of 209 and 210 indications.The matched edges of inner casing 107 and shell 104 are provided with the protuberance that conforms to the profile of groove on the respective fixation plate.In the time of in the protuberance on inner casing and the shell is forced to push and in the groove on the fixed head of outer seal ring, they are sandwiched in the groove.
[42] Fig. 6 B shows another embodiment that is used for outer seal ring 103 is attached to shell 104.Keep baffle plate 301 to be configured such that the lip ring 302 that is provided by shell 104 is provided to outer seal ring 103.In this case, the rigid fixation plate 207 of outer seal ring no longer needs but 301 replacements of available flexible baffle.Attention uses the groove-protuberance as shown in Fig. 6 A right in Fig. 6 B, and the form that promptly is press-fitted is attached to inner casing 107 with inner seal ring 102.Those of skill in the art will understand, although this specific embodiment adopts form and the baffle ledge form of being press-fitted, also can use other attached or engagement means between ear sealing and two rigid crusts.
[43] sound attenuation performance of hearing protectors is used as is carried out objective measurement by the described Real-Ear-At-Threshold of ansi standard S3.19-1974 (REAT) (the true hearing under the limit) method.Although not fully according to standard-required (for example, use 9 objects, rather than as in the standard specified 10), carry out the REAT test and compare with fade performance to the present invention and traditional single-walled earmuff.Curve L4 among Fig. 7 is the test REAT attenuation data of the isolated bivalve earmuff of basis embodiment structure as shown in Figure 2.The test REAT attenuation data of the conventional single-walled earmuff that prior art is known is plotted as the curve L5 among Fig. 7.Article two, curve is the average and average attenuation that records from 125Hz to 8000Hz on 9 objects.But guarantee result's comparison and illustrative, the encirclement volume and weight of the selected traditional earmuff that is used to test is similar to the bivalve earmuff of constructing according to embodiment described herein.In addition, two total in test identical headbands of earmuff, thus when putting on, two earmuffs are realized identical static clamping force by subjects.
[44] curve L4 is compared with curve L5, can see, at the about frequency place more than the 300-400Hz, by being installed in the cup-shaped shell on the elasticity outer seal ring and being installed in average acoustic attenuation that the cup-shaped inner casing on the elasticity inner seal ring realizes apparently higher than acoustic attenuation by traditional earmuff realization.Locate in low-frequency band (that is, 125Hz and 250Hz), the present invention carries out well slightly than traditional earmuff.The analyses and prediction that provide among result of the test and Fig. 4 are consistent.
[45] as shown in Figure 4, when the middle springs rigidity between two rigid crusts reduced, sound attenuation performance was further improved.Reduce middle springs rigidity, ideal case is not have mechanical connection between shell and inner casing.Fig. 8 shows the cutaway view of acoustic attenuation earmuff assemblies 200, and this earmuff assemblies 200 comprises rigid inner shell 107 and outer rigid housing 104, and wherein this inner casing is located in the enclosure fully by resilient ear seal 101.Earmuff assemblies shown in Fig. 2 100 and the earmuff assemblies 200 shown in Fig. 8 are compared, can see that two earmuff assemblies have most of parts, but can distinguish with two features.At first, earmuff assemblies 200 does not comprise as employed elastomeric connector 106 in earmuff assemblies 100.This is used to be reduced in synergistic mechanical stiffness between inner casing 107 and the shell 104.The second, in earmuff assemblies 100 and earmuff assemblies 200, the differently directed and termination of the flexible thin 110 between inner seal ring 102 and the outer seal ring 103.The flexible thin 110 in the earmuff assemblies 200 because earmuff assemblies 200 does not comprise quiet headband clamping force is not delivered to the elastomeric connector 106 of inner casing 107 from shell 104, so will apply the headband clamping force to keep inner casing and wearer's a device that contacts to inner casing as being used for.
[46] Fig. 9 shows the cutaway view according to the detailed structure of the ear of Fig. 8 sealing.Identical with the ear sealing shown in Fig. 5 A, the ear sealing among Fig. 9 comprises concentric locating and the outer seal ring 103 and the inner seal ring 102 that interconnect by annular flexible thin 110.The outer and inner sealing ring of this annular comprises first flexible shroud and second flexible shroud respectively.Two flexible shrouds are filled with padded coaming (211 and 212), such as foam or silicon compound or both combinations.First flexible shroud is attached to first rigid fixation plate 207, and second flexible shroud is attached to second rigid fixation plate 208.First and second rigid fixation plate all are provided with and are used to make engages to arrive the device of corresponding rigid crust.In assembling position as shown in Figure 9, inner seal ring 102 and outer seal ring 103 circumferentially spaceds are apart from d.In one embodiment, the scope of d is from 2mm to 5mm.In another embodiment, the outer peripheral edges of flexible thin 110 terminate in lower periphery 401 places on the vertical scope of freedom of first fixed head 207, and the inner peripheral of flexible thin 110 terminates in upper peripheral edge 402 places on the vertical scope of freedom of second fixed head 208.Then, limit sharp angle by 110 vertical scope of freedoms of flexible thin along the plane of stretching and external fixation plate 207 or internal fixation plate 208.
[47] in one embodiment, the amount of the big h of height of the aspect ratio inner seal ring 102 of outer seal ring 103.In another embodiment, h according to the profile of the head surface around the ear 0 and 10mm between at random circumferentially change.For example, be positioned at before the ear part of the head surface of face before the wearer for contact, h can be 0, and is positioned at after the ear towards the part of the head surface of wearer's nape for contact, and h can have higher value.When earmuff assemblies 200 was in the load condition, outer seal ring 103 and inner seal ring 102 will be compressed to wearer's head and because the mode of flexible thin 110 orientations will produce tension force in flexible thin 110.This tension force to inner casing 107 provide static clamping force with keep inner casing 107 and contact and keep with wearer's head inner casing 107 and wearer between excellent sealing.
[48] Figure 10 A and Figure 10 B show free body diagram (FBD), show the quiet headband clamping force in the flexible thin 110 and the relation between the quiet tension force in by the embodiment of Fig. 9 example.Figure 10 A has shown the FBD of outer seal ring 103, wherein f
hBe the clamping force that provides by headband 105, f
1Be 103 reaction force from the head surface to the outer seal ring, and f
2Be the quiet tension force that is created in the flexible thin 110.Then, for outer seal ring 103, dynamic balance relation vertically can be written as:
f
h＝f
1+f
2cosα (1)
[49] similarly, Figure 10 B has shown the FBD of inner seal ring 102, wherein f '
2Be size and f
2The reaction tension force that equates, and f
3It is 102 reaction force from the head surface to the inner seal ring.Then, for inner seal ring 102, dynamic balance relation vertically can be written as:
f
3＝f′
2cosα (2)
[50], can find that little angle [alpha] causes higher reaction force, can be applied to the clamping force of inner casing 107 from formula (2).This cause again inner casing 107 and wearer the head between better airtight quality.In one embodiment, α is less than 30 °.Be understood that easily, in order between user's head and inner seal ring 102 and outer seal ring 103, to form good sealing, f at the interface
1Or f
3All can not be zero.Another the analysis showed that f
1And f
3Size determine by the compression ratio of outer seal ring 103 and inner seal ring 102.In another embodiment, the ear sealing that operation parameter has structure shown in Fig. 9 with formation, thus in load condition, consequent clamping force on shell 104 and inner casing 107 has following relation:
[51] those of skill in the art will understand, and under the situation that does not depart from this scope of disclosure, structure described herein and method can embody with other concrete form, and embodiment described herein is exemplary but not determinate in every respect.Those of skill in the art will be familiar with, and can use other embodiment of notion described herein.In addition, the reference of the claim element of the singulative that for example uses article " ", " one " or " this " is not thought this element is defined in singulative.And, all be exemplary but not determinate in every respect to the illustrative reference of special time, the time interval and script or code segment.
Claims (25)
1. acoustic attenuation earmuff assemblies that is used for wear-type hearing protection earphone comprises:
Cup-shaped rigid shells:
Headband, described headband is attached to described cup-shaped rigid shells, and wherein when being put on by the user, described headband provides the static clamping force of the head that points to described user to described acoustic attenuation earmuff;
Cup-shaped rigid inner shell, wherein said inner casing is less than described shell and be positioned at described shell fully, and the outer surface of the inner surface of described shell and described inner casing limits intermediate air gap;
Elastomeric connector is used for described inner casing is elastically connected to described shell, and wherein said static clamping force is delivered to described inner casing by described elastomeric connector;
Ear sealing, described ear sealing has outer seal ring and inner seal ring, and wherein said outer seal ring is attached to described shell, and described inner seal ring is attached to described inner casing, and described outer seal ring and described inner seal ring are via annular thin list layer flexible interconnect.
2. acoustic attenuation earmuff assemblies according to claim 1, wherein said elastomeric connector is selected from the group of being made up of foam spacer, spring and elastomer connector.
3. acoustic attenuation earmuff assemblies according to claim 1 further comprises the foam keeper, and described foam keeper and makes described inner casing be positioned at the centre of described shell in described intermediate air gap.
4. acoustic attenuation earmuff assemblies according to claim 3, wherein said foam keeper is selected from the group of forming by froth bed, foam ring or with a plurality of foam spacers of separation pitch circumferential arrangement described intermediate air gap.
5. acoustic attenuation earmuff assemblies according to claim 1, wherein the volume that is surrounded by described inner casing is 60% to 85% of the volume that surrounded by described shell.
6. acoustic attenuation earmuff assemblies according to claim 1, wherein said elastomeric connector comprises the elastic interconnection liner of being made by the elastomeric material with first rigidity value and second rigidity value, wherein said first rigidity value is greater than described second rigidity value, and when being compressed in the certain percentage of described elastomeric connector at its original length, present first rigidity value, and when described elastic interconnection liner is further compressed, present described second rigidity value.
7. acoustic attenuation earmuff assemblies according to claim 6, wherein said elastic interconnection liner is made by the polyurethane-base flexible foam, and when the user put on described acoustic attenuation earmuff assemblies, described elastic interconnection liner was by the described static force compresses 10%-40% that clamps.
8. acoustic attenuation earmuff assemblies according to claim 1, wherein said annular flexible thin comprises:
Outer peripheral edges, described outer peripheral edges are attached to the inner peripheral surface of described outer seal ring;
Inner peripheral, described inner peripheral is attached to the outer peripheral face of described inner seal ring; And
Acute angle, described acute angle stretches the plane at place by described annular flexible thin and the described outer peripheral face of described inner seal ring limits, wherein when the user puts on described acoustic attenuation earmuff assemblies, described annular flexible thin in response to described inner seal ring and attached inner casing produce tensioning towards the described static clamping force of user's head pulling.
9. acoustic attenuation earmuff assemblies according to claim 8 wherein stretches described acute angle that the described outer peripheral face of the plane at place and described inner seal ring limits less than 30 ° by described annular flexible thin.
10. an ear that is particularly suitable for using with earmuff assemblies seals, and described earmuff assemblies comprises the inner casing that is positioned at shell, and described ear sealing comprises:
The annular outer seal ring comprises:
First flexible shroud, described first flexible shroud contacts and surrounds described ear padded coaming with the ear padded coaming, and described first flexible shroud provides annular exposure, the annular base that is positioned at described annular exposure opposite side and the medial surface and the lateral surface of the head that is suitable for contacting the user; And
First rigid fixation plate, be used for described annular outer seal ring is fixed to the described shell of described earmuff assemblies, wherein said first rigid fixation plate comprises the vertical scope of freedom and horizontal basal plane, and described horizontal basal plane conforms to the shape of the described annular base of described first flexible shroud and is attached to the described annular base of described first flexible shroud;
It is interior and concentric with described annular outer seal ring that annular inner seal ring, wherein said annular inner seal ring are positioned at described annular outer seal ring, and described annular inner seal ring comprises:
Second flexible shroud, described second flexible shroud contacts and surrounds described ear padded coaming with described ear padded coaming, and described second flexible shroud provides annular exposure, the annular base that is positioned at described annular exposure opposite side and the medial surface and the lateral surface of the head that is suitable for contacting the user; And
Second rigid fixation plate, be used for described annular inner seal ring is fixed to the described inner casing of described earmuff assemblies, wherein said second rigid fixation plate is provided with the vertical scope of freedom and horizontal basal plane, and described horizontal basal plane conforms to the shape of the described annular base of described second flexible shroud and is attached to the described annular base of described second flexible shroud; The described lateral surface of described thus second flexible shroud and the described vertical scope of freedom of described second rigid fixation plate form the outer peripheral face of described annular inner seal ring;
Width is the air gap of d, and described air gap separates described annular inner seal ring and described annular outer seal ring; And
Annular thin list layer, wherein said annular thin list layer makes described annular outer seal ring and described annular inner seal ring flexible interconnect.
11. ear sealing according to claim 10, wherein said annular flexible thin comprises:
Outer peripheral edges, described outer peripheral edges are connected to the inner peripheral surface of described annular outer seal ring, and the inner peripheral surface of described annular outer seal ring comprises the described medial surface of described first flexible shroud and the described vertical scope of freedom of described first rigid fixation plate; And
Inner peripheral, described inner peripheral is connected to the outer peripheral face of described annular inner seal ring, and the outer peripheral face of described annular inner seal ring comprises the described lateral surface of described second flexible shroud and the described vertical scope of freedom of described second rigid fixation plate.
12. ear according to claim 10 sealing, wherein the scope of the width d of the described air gap that described annular inner seal ring and outer seal ring are separated is that 2mm is to 5mm.
13. ear sealing according to claim 10, the height of wherein said annular outer seal ring is more than or equal to the height of described annular inner seal ring.
14. ear sealing according to claim 13, the scope of the difference between the height of wherein said annular outer seal ring and the height of described annular inner seal ring is that 0mm is to 10mm.
15. ear sealing according to claim 11, the described outer peripheral edges of wherein said annular flexible thin are connected to the inner peripheral of the described basal plane of described first flexible shroud by attachment means, and described attachment means is selected from the group of being made up of adhesive and heat treatment.
16. ear sealing according to claim 11, the described inner peripheral of wherein said annular flexible thin is connected to the outer peripheral edges of the described basal plane of described second flexible shroud by attachment means, and described attachment means is selected from the group of being made up of adhesive and heat treatment.
17. ear according to claim 11 sealing, the width of wherein said annular flexible thin are 1.5 times of width d of described air gap that described inner seal ring and described outer seal ring are separated at least.
18. ear sealing according to claim 11, wherein said annular flexible thin comprises a plurality of blow vents of circumferential distribution.
19. ear sealing according to claim 11, wherein said annular flexible thin is parallel to the described exposure orientation of described second flexible shroud, the described outer peripheral edges of described annular flexible thin are connected to the described medial surface of described first flexible shroud, the described inner peripheral of described annular thin list layer is connected to the described lateral surface of described second flexible shroud, thereby the distance of the described exposure of described second flexible shroud of distance is less than 3mm.
20. ear according to claim 19 sealing, the width of wherein said annular flexible thin are equal to or less than the width d of the described air gap that described inner seal ring and described outer seal ring are separated.
21. ear sealing according to claim 19, wherein said annular flexible thin comprises a plurality of blow vents of circumferential distribution.
22. ear sealing according to claim 11, the described outer peripheral edges of wherein said annular flexible thin are connected to the lower periphery on the described vertical scope of freedom of described first rigid fixation plate, and the described inner peripheral of described annular flexible thin is connected to the upper peripheral edge on the described vertical scope of freedom of described second rigid fixation plate, stretches the plane at place and the described vertical scope of freedom qualification acute angle of described first rigid fixation plate or described second rigid fixation plate by described annular flexible thin thus.
23. ear sealing according to claim 22, wherein said acute angle is less than 30 °.
24. ear sealing according to claim 22, wherein said annular flexible thin is provided with a plurality of blow vents of circumferential distribution.
25. ear sealing according to claim 11, wherein said outer seal ring and described inner seal ring are equipped with the blow vent that at least one is used for isostasy.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US87266906P | 2006-12-04 | 2006-12-04 | |
| US60/872,669 | 2006-12-04 | ||
| US11/949,850 | 2007-12-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101595738A true CN101595738A (en) | 2009-12-02 |
Family
ID=41409215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800505396A Pending CN101595738A (en) | 2006-12-04 | 2007-12-04 | Acoustic attenuation earmuff with isolated duplex shell structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101595738A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079137A (en) * | 2013-01-16 | 2013-05-01 | 青岛歌尔声学科技有限公司 | Headset with pressure equalizer |
| CN106412738A (en) * | 2015-05-29 | 2017-02-15 | 铁三角有限公司 | Ear pad and headphone |
| CN106895131A (en) * | 2015-12-21 | 2017-06-27 | 博世电动工具（中国）有限公司 | Sealing ventilation device and the equipment including it |
| CN106982401A (en) * | 2017-04-10 | 2017-07-25 | 东莞市穗崴皮具有限公司 | Improve the earphone pad foam and its earphone pad of closing property of sealing |
| US9807493B1 (en) | 2016-04-21 | 2017-10-31 | Human, Incorporated | Attachment apparatus |
| CN111819864A (en) * | 2018-03-13 | 2020-10-23 | 宗德工业国际有限公司 | Headband cover for removable attachment to headband of headset |
| CN114466273A (en) * | 2021-12-02 | 2022-05-10 | 美律电子(深圳)有限公司 | Earphone device |
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2007
- 2007-12-04 CN CNA2007800505396A patent/CN101595738A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079137A (en) * | 2013-01-16 | 2013-05-01 | 青岛歌尔声学科技有限公司 | Headset with pressure equalizer |
| CN106412738A (en) * | 2015-05-29 | 2017-02-15 | 铁三角有限公司 | Ear pad and headphone |
| CN106895131A (en) * | 2015-12-21 | 2017-06-27 | 博世电动工具（中国）有限公司 | Sealing ventilation device and the equipment including it |
| CN106895131B (en) * | 2015-12-21 | 2024-01-23 | 博世电动工具（中国）有限公司 | Sealing ventilation device and equipment comprising same |
| US9807493B1 (en) | 2016-04-21 | 2017-10-31 | Human, Incorporated | Attachment apparatus |
| US10382855B2 (en) | 2016-04-21 | 2019-08-13 | Human, Incorporated | Attachment apparatus |
| CN106982401A (en) * | 2017-04-10 | 2017-07-25 | 东莞市穗崴皮具有限公司 | Improve the earphone pad foam and its earphone pad of closing property of sealing |
| CN111819864A (en) * | 2018-03-13 | 2020-10-23 | 宗德工业国际有限公司 | Headband cover for removable attachment to headband of headset |
| US11184710B2 (en) | 2018-03-13 | 2021-11-23 | Zound Industries International Ab | Headband cover for detachable attachment to a headband of a headphone |
| CN111819864B (en) * | 2018-03-13 | 2022-02-18 | 宗德工业国际有限公司 | Headband cover for removable attachment to headband of headset |
| CN114466273A (en) * | 2021-12-02 | 2022-05-10 | 美律电子(深圳)有限公司 | Earphone device |
| TWI811874B (en) * | 2021-12-02 | 2023-08-11 | 大陸商美律電子(深圳)有限公司 | Earphone device |
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