CN103096233B - Precise ring-shaped tube composite channel speaker system - Google Patents
Precise ring-shaped tube composite channel speaker system Download PDFInfo
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- CN103096233B CN103096233B CN201210577138.9A CN201210577138A CN103096233B CN 103096233 B CN103096233 B CN 103096233B CN 201210577138 A CN201210577138 A CN 201210577138A CN 103096233 B CN103096233 B CN 103096233B
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Abstract
The invention discloses a high-property mid-bass speaker system and particularly relates to a precise ring-shaped tube composite channel speaker system. A ring-shaped short tube used for radiating sound of a speaker is arranged on the back of a mid-bass cone speaker to form a composite channel, a sound radiation environment of a vibration body is limited, and vibration radiation is influenced. When the speaker works in low frequency, the precise ring-shaped composite channel is formed by a ring-shaped tube acoustic transformator which is provided with an even section and formed by a ring-shaped area, and a ring-shaped tube acoustic quality component which is provided with an even section, is constant and is formed by a ring-shaped channel. Total equivalent vibration quality of the speaker is added due to the combined action of the acoustic transformator and the acoustic quality component, low-frequency resonant frequency of the speaker can be reduced, and low-frequency radiation efficiency of the speaker can be improved. The inner portion of the precise ring-shaped tube composite channel is smooth and clean, the speaker is surrounded in a large range, direct interference, caused by vibration of air inside a box body, of the surface of a vibration body is reduced, load of the surface of the vibration body is even, dynamic response speed is beneficially improved, and distortion is reduced.
Description
technical field:
Speaker system with precision circular-tube compound channel of the present invention, belongs to electroacoustic techniques field.
background technology:
In daily life, people often use loud speaker to sound of resetting.In conventional electrodynamic type, bass cone loudspeaker (comprises bass, middle bass, Squawker and full range speaker, hereinafter also referred to as loud speaker) complete after, the resonance frequency omega 0 of the resonator system of its low frequency power just determines, ω 0 determines the lower limit of this speaker playback sound frequency, and usually to be arranged on loud speaker that infinitely great baffle works for reference, loudspeaker frequency ω is described
0etc. index.In this case, be placed in the loud speaker on infinitely great baffle, directly free radiation carried out to the air in former and later two directions and transmit sound.
Usually can only not utilize baffle to reset sound with such loud speaker, at that rate, the sound wave that the phase place that former and later two directions of loudspeaker vibrating body give off is contrary, can aloft mix mutually and offset, loss loud speaker acoustic capabilities.During use, loud speaker can not be arranged on infinitely great baffle and use, and it is always together with audio amplifier, utilizes that the baffle of sound box is split, the sagittal acoustic irradiation of limiting loudspeaker vibrating body.These are just different from the reference environment for use of loud speaker, will affect the performance of loud speaker.
But when loud speaker be contained in audio amplifier forms sound box system use time, the loud speaker acoustic energy entrained by radiated wave is behind subject to the encirclement of casing, could not exhale in casing, can not be used directly, and these sound waves also can affect by loudspeaker box internal environment and are applied on the vibrating body of loud speaker by roundtrip, and the acoustic pressure of reflected wave, the vibration of loudspeaker vibrating body can be disturbed, further ability and the effect affecting loudspeaker radiates sound, and, it is nearer for these object distance of loud speaker surrounding environment, affects also larger.This surrounding enviroment are on the impact of loudspeaker radiates, be embodied in the numerical value changing loud speaker total equivalent MM, CM, also have impact on the low-frequency resonant frequency of loud speaker, therefore, the low-frequency range of speaker playback sound in sound box system is determined by loud speaker and sound box two aspect factor.For above formula, if the impact of sound box can make the total equivalent force CM of loud speaker now or total equivalent mass MM strengthen, ω 0 can be made to decline, loud speaker can be reset out more bass.
But actual conditions are contrary.Usually when loud speaker is external according to forward, the audio amplifier dorsad traditional approach of radiation sound in casing being arranged on to common structure uses, effectively can not increase its total equivalent mass MM, on the contrary, but always make its vibrating body back side reduce with shake quality and total equivalent force CM.As shown from the above formula, this, by the low-limit frequency of the sound that makes sound box system reset out, improves than the resonance frequency omega 0 of single loud speaker, causes loud speaker to lose the ability of some playback low-frequency sounds.
The reason that in above-mentioned situation, the total equivalent force CM of loud speaker reduces, because the air in audio amplifier forms an acoustic compliance element, when loudspeaker vibrating body works in low frequency, it is just as a resilient spring, give loudspeaker vibrating body resiliency supported from behind, limit the resonance of its vibrating body from loud speaker outside, make speakers low frequencies harmonic motion become difficulty, can not promote the original sound many like that of air radiation, therefore its low-frequency resonant frequency raises.Usually, sound box volume is less, and the elasticity that casing air produces is larger, and compliance less (its coefficient of elasticity equals the inverse of compliance coefficient), vice versa.The elastic reaction of this acoustic compliance element of casing air, show in superincumbent calculating formula, this acoustic compliance element when being exactly low frequency, equivalent parallel is on the existing mechanical compliance element of loud speaker itself, loudspeaker vibrating body is made to add " bullet " property, decrease " suitable " property of the total equivalent force CM of vibrating body, cause its ω 0 to raise.This situation in common sound box system, as in the audio amplifiers such as airtight audio amplifier, reflex cabinet, all so.That is, loud speaker traditionally and occupation mode thereof are combined formed sound box system with traditional loudspeaker box structure, in use cannot reduce the low-frequency resonant frequency of finished speaker.
Therefore, allowing the most popular method of sound box system playback high-fidelity, more lower frequency sounds traditionally, is adopt bigbore woofer.Heavy caliber woofer cones area is larger, and can promote more air vibration radiation, its vibrating body is also heavier, and this allows the total equivalent mass MM of loud speaker therefore strengthen, and ω 0 is declined.This dependence increases the way that loudspeaker vibration weight reduces loudspeaker frequency, mean and promote this loud speaker with more how valuable cones material and larger power amplifier, loud speaker also must have more big and heavy voice coil loudspeaker voice coil to bear the power of amplifier, loud speaker also needs larger magnet to make it vibrate to produce larger motive force, therefore the production of this method and use cost very high, and produce, debug also more complicated.During with heavy caliber woofer playback middle pitch, also dynamic response can be made slow because its vibrating body is heavier, affect middle pitch hi-fi reproduction, now, for taking into account the playback of bass and middle pitch, often use a heavy caliber woofer and a Squawker, respectively playback bass and middle pitch, but this causes higher cost and workload simultaneously.
And, usually when common medium and low spectrum loudspeaker be arranged on sound box uses time, in order to avoid casing standing internal wave is on the impact of loud speaker, loud speaker is not arranged on the middle of casing baffle usually, and in this kind of situation lower box, the reflected wave of various frequency is applied to the interference that vibrating body goes up dorsad is unbalanced, and this also have impact on the load balancing of vibrating body, its flexible vibratory can be affected, reduce reaction speed, reflected wave, to the interference of vibrating body, also causes vibration distortion.
Patent of invention " a kind of New-type loudspeaker system " (patent No.: ZL02 2 12903.0) provides the acoustic mass in the transaudient sleeve pipe of special radiation utilizing speaker operation loud speaker when low frequency, increase the total equivalent mass MM of loud speaker, effectively reduce the technology of the low frequency power resonance frequency of medium and low frequency loud speaker.
" a kind of New-type loudspeaker system " is the speaker system that the passage be made up of a medium and low spectrum loudspeaker and transaudient sleeve pipe is combined together to form, the core work of " a kind of New-type loudspeaker system " has installed a transaudient sleeve channel dorsad at loudspeaker vibrating body, for radiation, transmits loud speaker sound dorsad.Because this passage is the unique passage being connected on loud speaker outside radiation sound dorsad, therefore, the vibration radiation energy of loud speaker, by the air load that is applied between sleeve pipe.
In " a kind of New-type loudspeaker system " when speaker operation is in low frequency, loud speaker is to the narrow space of a section before transaudient sleeve pipe, form an acoustic compliance element CA, and be socketed the air part of the annular space that sectional area is identical between inside and outside two pipes on a speaker, form acoustic mass element.Now, from structure, " a kind of New-type loudspeaker system ", mainly loud speaker and an acoustic compliance element of a low frequency operation and acoustic mass element are connected a complex sound structure of formation mutually, when speaker operation is in low frequency, this is connected on the acoustic mass of the acoustic mass element in the passage of loud speaker behind, will become a part for speaker system oscillating mass, equivalence increases this acoustic mass item, and the total equivalent oscillating mass MM of speaker system increases.According to above-mentioned speakers low frequencies resonant frequency equation, this can reduce speakers low frequencies power resonance frequency, causes loudspeaker radiates to go out than original lower low-frequency sound.
When " a kind of New-type loudspeaker system " is installed to loudspeaker box uses time, surround on a large scale because loudspeaker vibrating body is subject to transaudient sleeve pipe dorsad, this reflective sound wave avoiding various frequency in casing largely comprises standing wave and directly acts on vibrating body, this can improve the antijamming capability of loud speaker, and keep the uniform balance of loud speaker acoustic load dorsad, be conducive to the reaction speed improving vibrating body.Significantly, this acoustic mass only speaker operation in low frequency time just exist, once loud speaker departs from low frequency enter intermediate frequency operation interval, this heavier load of the acoustic mass in transaudient sleeve pipe also just disappears, and loudspeaker vibrating body still can normally work like a cork.Visible, this structure also solves well and improves the ability of playback bass and the speed issue of playback middle pitch.
Usually, due to speaker system in most cases reset in bass music, song, little long time continuous working is in bass regime, therefore " a kind of New-type loudspeaker system " improves the total equivalent oscillating mass MM of loud speaker by the acoustic mass existed in sleeve channel transaudient during low frequency operation, reduce the method for common finished product medium and low spectrum loudspeaker low-frequency resonant frequency, there is essential meaning pole, compared to common woofer, this way had both saved a large amount of precious materials, affected again the operating rate that loud speaker intermediate frequency one is with hardly.Therefore, no matter " a kind of New-type loudspeaker system " is realizing on bass technical method, or in the structure of speaker system, all not identical with common medium and low spectrum loudspeaker, it has developed medium and low spectrum loudspeaker technology.
But by studying discovery further, " a kind of New-type loudspeaker system " structurally also also exists some problems, and this have impact on the performance of this systematic function and ability, is necessary its Improvement and perfection, so that the performance of further raising system and function.
" a kind of New-type loudspeaker system " structure, principle and performance mainly deposits following Railway Project:
One, the channel space before loudspeaker vibrating body to transaudient cannula inlet port, forms an acoustic compliance element CA, there is uneven path in this section of space before CA contains speaker frame root junction to magnet thereafter.This section of exposed loud speaker uneven surface, stop can be produced to the sound wave of vibration radiation and cause reflection, cause the distortion in sound wave transmittance process and acoustical energy losses, simultaneously, due to transaudient sleeve structure restriction, the radiant transfer path constraining loud speaker behind sound wave, the acoustic pressure of cone vibrating body institute radiative acoustic wave is less along channel attenuation, higher acoustic pressure is had in transaudient sleeve channel, in this case reflect and also can cause the interference stronger to vibrating body, make vibration distortion, and make the sound wave distortion of its radiation.That is, the various reflections that in passage, sound wave produces, can cause distortion totally three kinds of distortions of transmitting sound wave in the vibration distortion of vibrating body, radiative acoustic wave distortion and passage.And acoustic compliance element CA, does not help the resonance frequency reducing loud speaker, also make equivalent electric circuit complicated, be unfavorable for simplification and the intuitive analysis of problem.
Two, the porch of CA element additional space, the path area that air flows through there occurs change, that is, in this speaker system, before loud speaker to space, acoustic mass element place in transaudient sleeve pipe in end spaces, imply an acoustic transformer.But owing to there is the connection gap between speaker frame and upper conduction magnetic board and magnet in passage, and upper conduction magnetic board and magnet upper end surface are with the reflecting surface towards vibrating body, unsmooth in the passage that this these exposed part by means of loud speaker is formed, sound wave is in reflect and to cause distortion and acoustical energy losses herein, due to the uncertainty of these distortions and acoustical energy losses, have impact on the accuracy of the due transform effect of acoustic transformer that CA implies.
Three, the inner surface of the frame supporting surface of loud speaker dorsad around acoustic irradiation mouth, the path of the sound wave blocking vibrating body radiation homogeneous radiation backward, make the sound wave distortion of radiation, affect radiation efficiency, and due to whole transaudient sleeve channel narrow, have higher acoustic pressure in transaudient sleeve channel, the acoustic pressure of cone vibrating body institute radiative acoustic wave is little along channel attenuation, closely at once can produce the reflection of higher-strength, the vibration of interference vibrating body, causes vibration and the radiation distortion of vibrating body.
Four, the mode of the equal acoustic mass element of a kind of sectional area be made up of two straight pipes is simply given in " a kind of New-type loudspeaker system ", and transaudient passage in fact between two round types connected together and the transaudient passage that forms between two plectanes are unequal along the sectional area of channel direction, in order to the requirement making it meet transaudient sleeve pipe acoustic mass, need to re-construct acoustic mass element between them.Therefore, the construction method of the acoustic mass element in the transaudient passage formed between round type and between two plectanes will be improved comprehensively.
The problems referred to above one, two are relevant with the acoustic compliance element CA in transaudient sleeve pipe, and, acoustic compliance element CA is relevant with the transaudient channel design of acoustic transformer element and radiation, therefore, this acoustic compliance element CA in transaudient sleeve channel must be redesigned, and rigorous structure acoustic transformer element, also to improve loud speaker shelf structure in addition, improve the construction method of acoustic mass element.Visible, in order to performance and the function of General Promotion " a kind of New-type loudspeaker system ", the transaudient sleeve channel in " a kind of New-type loudspeaker system " must be rebuild comprehensively.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of speaker system with precision circular-tube compound channel, solve the inner surface because of the frame supporting surface around loud speaker dorsad acoustic irradiation mouth, the path of the sound wave stopping the radiation of vibrating body cone homogeneous radiation backward, cause radiative acoustic wave distortion, affect the problem of radiation efficiency; Also solve distortion and acoustical energy losses that the reflecting surface in passage in sound wave transmittance process in the space at CA place causes, and by solving distortion and acoustical energy losses and uncertainty thereof in CA; Also improve the accuracy of the transform effect of acoustic transformer implicit in CA; Also solve the formation problem of the acoustic mass element in the circular passage formed between internal and external casing when internal and external casing is not straight tube; By increasing damping material in ring pipe passage, the damping of speaker system can also be regulated.To overcome the defect of existing speaker system.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Speaker system with precision circular-tube compound channel, comprise cone loudspeaker, described cone loudspeaker involving vibrations body cone and the frame with radiation port, described frame is made up of frame chassis, frame sidewall, frame sidewall front end is with flanging, and the rear end of described frame is provided with circular magnet; Also comprise the second inner sleeve on excircle that front end is arranged on circular magnet and coaxial with circular magnet; Also comprise the outer tube coaxial with the second inner sleeve, the radiation port of frame is positioned at the inside of outer tube; Form ring pipe passage between the outer wall of the second inner sleeve and the inwall of outer tube, it is characterized in that:
Also comprise the first inner sleeve of one section of axle centered by vibrating body cone axes O, between the rear end root that the front end of the first inner sleeve is airtight is connected to frame to radiation port back edge, first inner sleeve rear end aligns with the second inner sleeve front end and is connected, between the rear end root and the second inner sleeve of frame, form level and smooth transition face
The intersecting lens crossing the section of circular magnet axes O and the outer wall of the second inner sleeve side is L1, and the intersecting lens of the outer sleeve inner wall of described section and L1 the same side is L2; L1 and L2 is parallel to each other.
In ring pipe passage, be provided with trend move towards some groups of consistent block pieces with ring pipe passage, block piece is solid or is obturator, and be transaudient passage between adjacent block piece, each transaudient passage has consistent cross-sectional area along its transaudient trend.
Described frame sidewall laminating is arranged on the inwall of outer tube, and being connected with some brace rods between described frame chassis and sidewall, is radiation port between adjacent supports muscle.
It is annular space between outer tube and the first inner sleeve; The length of the first inner sleeve and the length of described annular space are all less than or equal to 1/10 of the low-frequency resonant wave length of sound of speaker system.
In ring pipe passage, damping material is installed.
Angle α=90 ° between L1, L2 and axes O, the first inner sleeve, outer tube and the second inner sleeve are annular flat tabular or outer tube and the second inner sleeve and are annular flat tabular.
good effect of the present invention is:
In the present invention is main at four, carried out important improvement, raising and perfect to " a kind of New-type loudspeaker system ", speaker system with precision circular-tube compound channel performance boost after improving, usage is flexible and changeable.
1, a precise annular tube acoustic transformer element is constructed, improve passage environment, considerably reduce this section of passage to stop sound wave, reflect and the distortion that causes and acoustical energy losses, also system class is made to be simplified than circuit thus, farthest can improve acoustic mass element equivalent and act on same quality of shaking on loudspeaker vibrating body, reduce the low-frequency resonant frequency of loud speaker, reduce the direct interference of vibrating body surface by air vibration in casing, vibrating body surface loading is even, improve dynamic response speed, reduce distortion.
Have two place's acoustical energy losses in " a kind of New-type loudspeaker system " passage, one in channel space, is hindered acoustic reflection is produced by object; One on the tube wall of passage, is produced by the pipe friction of air and passage.The acoustic compliance element CA that the space limited by outer tube in passage after speaker frame to speaker magnet is formed, it is the element of a two-port, usually the area of its input port, delivery outlet is different, and from this meaning, CA space is identical with an acoustic transformer component space.But in the space at CA place, exposed magnet and speaker frame root junction some uneven surfaces like this, when sound wave is by this region, can reflect these local generations, sound energy consumption, and due to CA narrow space, reflection can form comparatively strong jamming to vibrating body, affect loudspeaker vibration, cause distortion and the acoustical energy losses of the vibration of vibrating body cone and radiant transfer process, and this point, CA is different from acoustic transformer, just in spatial relationship, in CA, imply an acoustic transformer.Because CA reduces frequency without any positive effect to " a kind of New-type loudspeaker system ", in equivalent electric circuit, it also makes complex circuit, is not easy to analyze.In transaudient sleeve channel acoustic compliance element CA uneven surface in space to the blocking reflected transmitting sound wave, have impact on the efficiency of medium and low frequency radiation and the fidelity of sound, the amplitude-frequency characteristic of intermediate frequency becomes uneven.Therefore, in speaker system with precision circular-tube compound channel, by increasing by the first inner sleeve, between the first inner sleeve and outer tube, construct a smooth annular space, instead of the uneven space at " a kind of New-type loudspeaker system " acoustic compliance element CA place, improve passage environment, considerably reduce this section of passage to stop sound wave, the distortion of reflecting and cause and acoustical energy losses, also system class is made to be simplified than circuit thus, farthest can improve acoustic mass element equivalent and act on same quality of shaking on loudspeaker vibrating body, reduce the low-frequency resonant frequency of loud speaker.
Precise annular tube composite channel is combined with loud speaker, be arranged on the forward of loud speaker, just construct speaker system with precision circular-tube compound channel, when ring pipe passage is an acoustic mass element, the equivalent sound quality of the ring pipe acoustic mass element in system, total equivalent mass of loud speaker can be increased, this can reduce the low-frequency resonant frequency of loud speaker, compared to the transaudient sleeve channel in " a kind of New-type loudspeaker system ", the distortion not having reflecting surface to cause due to the inner brilliance of precise annular tube composite channel group and energy loss, significantly improve the amplitude-frequency characteristic of the medium and low frequency that speaker system exports, make amplitude-frequency characteristic more level and smooth, sound is fidelity more.Precise annular tube composite channel group internal structure is regular, and major parameter is wherein programmable very accurate, is conducive to industrial standardization and produces.Be combined the speaker system with precision circular-tube compound channel formed by precise annular tube composite channel with loud speaker, the low-frequency resonant frequency of loud speaker can be reduced further principle.
Precise annular tube composite channel inside is bright and clean, is surrounded on a large scale by loud speaker, and decrease the direct interference of vibrating body surface by air vibration in casing, vibrating body surface loading is even, is beneficial to and improves dynamic response speed, reduces distortion.Common acoustic transformer imports and exports in the different hollow container of area at one to be formed, the acoustic transformer in speaker system with precision circular-tube compound channel of the present invention be by two by all means between annular space form, be different from general constructive method.
2, a kind of formation method of the acoustic mass element of other several primary structures in transaudient sleeve channel in perfect " New-type loudspeaker system ", speaker system with precision circular-tube compound channel structural change is many, and usage is more flexible.
In " a kind of New-type loudspeaker system ", when form the sound pipe shape of transaudient passage be expand outwardly round table-like time, the annulus area along channel direction will change, and the acoustic mass element now between internal and external casing will not exist.In order to make now still there is acoustic mass element in circular passage, must channel interior along channel direction re-construct out sectional area just as space, as acoustic mass element.
The basic comprising mode of the ring pipe acoustic mass element in speaker system with precision circular-tube compound channel is by even, the identical straight circular air duct of the one section of sectional area formed between the second inner sleeve and outer tube.In order to other needs, may also be the ring pipe passage of truncated conical shape, but directly can not form an acoustic mass element in this structure space, the acoustic mass element in this passage need be re-constructed.For this reason, in speaker system with precision circular-tube compound channel, also expand further, perfect when passage be a round table-like circular passage, and even the table top of this round table-like circular passage is expanded further and is made the inside and outside tube wall of passage be expanded to plan position approach, become inside and outside two plane plectanes, namely when round table-like circular passage becomes the passage between two plane plectanes, the generation type of interchannel acoustic mass element.These above-mentioned changes ensure that precise annular tube composite channel shape and apply more versatile and flexible.
For this reason, speaker system with precision circular-tube compound channel of the present invention, by increasing the trend some group block pieces consistent with ring pipe passage in sound passage, make often to organize between block piece is enclosure space, new transaudient passage is formed between two adjacent groups block piece, and make each transaudient passage have consistent cross-sectional area along its trend, even if round table-like sound pipe has and different expands outwardly angle, in the annular space formed between two pipes, acoustic mass element can be constructed simply, neatly, fall low-frequency requirement to meet.Equally, when round table-like circular passage becomes the passage between two plane plectanes, between two plectanes, also can re-construct acoustic mass element in this way.
Visible take these measures after, expand, other several main composition modes of acoustic mass element in perfect passage, fundamentally ensure that in passage, sound mass elements exists all the time, this guarantees the effect of the reduction power resonance frequency of precise annular tube composite channel structure of loudspeaker system, and make channel shape select more flexibly, freely, make its structure have adaptability widely.
3, transform the frame structure that loud speaker affects acoustic radiation, reduce frame internal surface area to the reflection of frame vibration radiation, reduce the distortion of radiation sound, improve fidelity and the radiation efficiency of sound.
Loud speaker in speaker system with precision circular-tube compound channel can be a common medium and low spectrum loudspeaker, also can be a medium and low spectrum loudspeaker improving loud speaker shelf structure.Its accurate transmission sound passage, critically can transmit sound wave, but when common medium and low spectrum loudspeaker forms speaker system with precision circular-tube compound channel, the sound wave of loudspeaker vibrating body radiation will enter transaudient passage by the radiation port on speaker frame lateral support face, and the remainder outside acoustic irradiation mouth on frame supporting surface, also blocking reflected effect can be produced to radiated wave, and because its position is very near apart from vibrating body, reflected wave can disturb vibrating body normal vibration immediately, and causes vibration distortion etc.Therefore, when the performance of radiant transfer sound of this system further need be improved, also necessary improvement to be done to speaker frame.In order to improve the sound radiation efficiency of speaker operation when the intermediate frequency, also need to reduce speaker frame to the stop of vibrating body radiative acoustic wave.
As claimed in claim 4, the speaker frame of improvement, the sidewall laminating of described frame is arranged on the inwall of outer tube, and being connected with some brace rods between the chassis of described frame and sidewall, is radiation port between every two brace rods.Use cylindricality muscle structure, can on the support strength basis ensureing speaker frame, reduce the Area of bearing of plate shaped frame, this reduces the area of frame towards the one side of loudspeaker vibrating body, also just reduce by the acoustic reflection of the sound wave effect of the direct radiation of vibrating body cone on it.
The area of the acoustic radiating stomatodeum in frame can also be strengthened simply, reduce frame support section area, and radiation perforate is evenly distributed.Like this, both reduced the stop to passed through radiative acoustic wave, made again the basic uniformity of radiated wave form before and after frame radiation port.
With improve loud speaker and frame Structure composing precise annular tube composite channel from more this ensure that in precise annular tube passage, air is incompressible, volume velocity does not change, and therefore, can ignore the acoustic compliance value of first passage.In analogy line map, completely eliminate the impact of acoustic compliance element CA in " a kind of New-type loudspeaker system " like this, analogy circuit becomes more succinct, clear and definite.
Channel interior further reduces stop to radiative acoustic wave and reflection, reduces the distortion and acoustical energy losses that produce in passage, is also conducive to that speaker system produces more greatly, the medium and low frequency sound of more fidelity.The loud speaker of the discharge area of radiation channel is expanded after improvement, a more accurate stiff piston is resembled during low frequency, the face if the ripple that the sound wave importing precise annular tube composite channel into by radiation port is consistent shakes, then can also improve the radiation efficiency of speaker system intermediate frequency.Usually, rib supporting surface area minimizing under the prerequisite ensureing structural strength of frame is not less than 50%, and this has increased substantially radiating aperture gross area accounting.
4, in circular passage, damping material is added in order to the damping situation in the damping " a kind of New-type loudspeaker system " of flexible speaker system with precision circular-tube compound channel, depend on air three the main aspects in the damping of loud speaker, the impact of sound passage and casing, it is very not convenient to regulate, and which has limited the Application Range of loud speaker.In order to utilize existing height damping value loud speaker more neatly, the present invention can in circular passage or the port of export add damping material, in order to the damping of adjustment precision ring pipe composite channel speaker system if desired.
From analyzing above, precise annular tube composite channel can with, potent influence more useful than transaudient sleeve channel, improve loudspeaker vibration quality, reduce the low-frequency resonant frequency of loud speaker, greatly improve low frequency radiation ability and the efficiency of loud speaker, and make the amplitude-frequency characteristic of system flatten and reduce distortion.Because of precise annular tube composite channel reasonable in internal structure, major parameter is wherein programmable more accurate, is conducive to industrial standardization and produces.Therefore speaker system with precision circular-tube compound channel, can the performance of overall effect loud speaker, it be a kind of than " a kind of New-type loudspeaker system " more accurately, speaker system efficiently.
5, by such speaker system with precision circular-tube compound channel, directly can use without the audio amplifier of sound box easily as one.
accompanying drawing illustrates:
Fig. 1 is structural representation of the present invention.
Embodiment
The present invention is further described below in conjunction with accompanying drawing and instantiation.
As shown in Figure 1, the present invention includes cone loudspeaker 1, described cone loudspeaker 1 comprise with radiation port frame 1-1 and be arranged on vibration cone 1-2 on frame 1-1 chassis.The rear end of described frame 1-1 is provided with the circular magnet 1-3 connecting upper and lower magnetic conductive board.
The present invention also comprises the second inner sleeve 2 on excircle that front end is arranged on circular magnet 1-3 and coaxial with circular magnet 1-3, and the present invention also comprises the outer tube 3 coaxial with the second inner sleeve 2, and frame radiation port is positioned at the inside of outer tube 3.Ring pipe passage 4 is formed between the outer wall of the second inner sleeve 2 and the inwall of outer tube 3.Described circular magnet 1-3 is coaxial with vibration cone 1-2.
The intersecting lens crossed between the vertical flat cutting face of the axes O of vibrating body cone 1-2 and the second inner sleeve 2 side outer wall is L1, and the intersecting lens of outer tube 3 inwall of described section and L1 the same side is L2.L1 and L2 is parallel to each other.
Also comprise the first round table-like inner sleeve 5 of one section of axle centered by vibrating body cone 1-2 axes O, between the rear end root that the front end of the first inner sleeve 5 is airtight is connected to frame 1-1 to radiation port back edge, first inner sleeve 5 rear end aligns with the second inner sleeve 2 front end and is connected, between the first installation place, inner sleeve 5 front end and the second inner sleeve 2, form level and smooth round table-like transition face.For smoothly transitting between first inner sleeve 5 and the second inner sleeve 2.First inner sleeve 5 can also be smeared with cream pledge and smooth to corresponding position, solidifies rear formation.
Be annular space 10 between outer tube 3 and the first inner sleeve 5, annular space 10 and described ring pipe passage 4 are configured for the precise annular tube composite channel of radiant transfer loud speaker sound wave dorsad jointly.
Angle between L1, L2 and axes O is the angular range of α, α is 0 °≤α≤90 °, when α 1 < α≤90 °, is provided with the some groups of block pieces that trend is consistent with ring pipe passage 4 in ring pipe passage 4.Be enclosure space in block piece, be transaudient passage between adjacent block piece, each transaudient passage has consistent cross-sectional area along its trend.Block piece can be clapboard.
The determination mode of α 1 is as follows: as α < α 1, and ring pipe passage 4 moves towards cross section and amasss basically identical in front and back, and ring pipe passage 4 substantially can as acoustic mass element.
During α=90 °, the first inner sleeve 5, outer tube 3 and the second inner sleeve 2 are annular flat tabular or outer tube 3 and the second inner sleeve 2 and are annular flat tabular.
The ratio that the gross area of described radiation port accounts for the frame 1-1 sidewall gross area is as far as possible large under the prerequisite ensureing structural strength, is such as not less than 80%.
The form of frame 1-1 can also be: its sidewall laminating is arranged on the inwall of outer tube 3, and being connected with some brace rods between the chassis of described frame 1-1 and sidewall, is radiation port between adjacent supports muscle.
Ring pipe passage 4 exit can be provided with damping layer.
The operation principle of speaker system with precision circular-tube compound channel:
In speaker system with precision circular-tube compound channel, the sound wave that loudspeaker vibrating body backward radiation goes out is exported by the radiation port on speaker frame, enter annular space and the port of export through ring pipe passage outputs to outside passage, therefore the air in passage becomes a part for loud speaker, any instant, the air in passage becomes the most direct load of vibrating body.Because precise annular tube composite channel is narrow short, when speaker operation is in low frequency, the acoustic pressure that vibrating body produces is maintained a period of time in the passage of acoustic mass element place, therefore in sound pipe, acoustic pressure raises, air load now in pipe is strengthened the reaction of loudspeaker vibrating body, and speaker system with precision circular-tube compound channel creates stronger acoustic radiation.
Because the internal and external casing forming first and second ring pipe passage is all short tube, therefore first passage is all jitty.I.e. precise annular tube composite channel, be by some for bass wavelength length of will resetting short tube form.According to definition, when the diameter of section size of ring pipe passage and the size of length are less than 1/10 of the low frequency sonic wavelength passed through in this tube passage, this passage is jitty.During design; the cross-sectional area of the mouth of entering of usual annular space passage is different; the cross-sectional area that ring pipe passage passage is imported and exported is identical; speaker system with precision circular-tube compound channel now; when speaker operation is in low frequency; annular space passage looping pipe acoustic transformer element, ring pipe passage looping pipe acoustic mass element.
Ring pipe acoustic transformer herein has two effects, one, acoustic transformer can by the mechanical impedance at its its two ends of no-load voltage ratio change sound, namely conversion acoustic mass element acts on the mechanical impedance on loud speaker, two, by the no-load voltage ratio amplification of acoustic transformer, the acoustic mass equivalence of acoustic mass element is increased to loud speaker one end, increase the equivalent mass that loud speaker is total, this can reduce the low frequency power resonance frequency of loud speaker, improves speakers low frequencies radiation efficiency.For " a kind of New-type loudspeaker system ", owing to making acoustic transformer with this smooth ring pipe passage, greatly reduce the energy loss of sound wave by its inside, the acoustic transformer of this structure can be done very accurate, this is also the implication of accurate two words in speaker system with precision circular-tube compound channel title of the present invention.
In speaker system with precision circular-tube compound channel, when speaker operation is in low frequency, because passage is acoustic mass element, air in its passage is not compressed, therefore ring pipe acoustic transformer element and ring pipe acoustic mass element have identical volume velocity, loudspeaker radiates sound wave can be without hindrance, lossless by after first passage, and be delivered in the air outside passage through passage, but this acoustic mass only speaker operation in low frequency time just exist, once loud speaker departs from low frequency enter mid-frequency region work, this acoustic mass also just disappears, visible loudspeaker vibration physical efficiency normally has bass area to turn to treble to work like a cork.
In speaker system with precision circular-tube compound channel, because first passage and passage have identical coefficient of friction, the acoustical energy losses in precise annular tube composite channel is become a common acoustic loss element R by equivalence
a2(inner air tube motion is formed with the viscous friction of tube wall).Visible speaker system with precision circular-tube compound channel, the transaudient passage of its radiation is a complex sound structure comprising acoustic transformer, acoustic mass element MA2, acoustic loss element RA2.
In admittance-type analogy substitutional connection, ring pipe acoustic transformer element and ring pipe acoustic mass element have the mechanical impedance change action at identical volume velocity and acoustic transformer two ends, be presented as the parallel relationship of two elements and the no-load voltage ratio of acoustic transformer, the no-load voltage ratio S of acoustic transformer
2/ S
1, reflect the mechanical impedance change action that this is connected on the acoustic transformer between loud speaker harmony mass elements, same the shake quality of acoustic mass equivalent action on loudspeaker vibrating body also will increased further in passage.
Be calculated as follows:
If outer tube is area is S
1round straight tube, simultaneously S
1effective vibrating body area when being also speakers low frequencies.Passage is circular straight channel, and area is S
2, length is in order to L
2.Then area is the quality .M of air in the passage of S2
mA0=S
2* L
2* ρ
0, acoustic mass M
a0=M
mA0/ S
2 2=ρ
0l
2/ S
2, namely air quality, the acoustic mass of viewability channel are all directly proportional to the length of this passage, and acoustic mass in it and S
2area is inversely proportional to, its air quality and S
2area is directly proportional, and the feature of Here it is ring pipe acoustic mass element, this means that the acoustic mass in the ring pipe passage that a small cross sections is amassed is larger.
M
a0normalize to the S of loud speaker
1the equivalent mass in face is (S
1/ S
2)
2m
a0, wherein S1/S2 is the no-load voltage ratio of ring pipe acoustic transformer.Usual S
1be greater than S
2there is acoustic mass element when time more easily ensures passage medium and low frequency, therefore make S in application
1be greater than S
2, now (S
1/ S
2)
2m
a0be greater than M
a0.That is, the equivalent sound quality of the passage transformed on loudspeaker vibrating body through first passage acoustic transformer substantially increases.
From speaker system low-frequency resonant formula ω 0=, now the total equivalent mass MM of electrodynamic loudspeaker system comprises cone basin equivalent mass, voice coil loudspeaker voice coil equivalent mass, vibrating body front with quality of shaking, the back side with the equivalence value (S of the acoustic mass of shake quality and ring pipe acoustic mass element
1/ S
2)
2m
a0, according to the feature of vibrating body radiation in sound pipe, comprise the loud speaker same mass M MR2 that shakes dorsad in whole sound pipe, in practical application, precise annular tube composite channel is a jitty, as long as the M of the therefore acoustic mass of ring pipe acoustic mass passage
a2equivalent mass (S
1/ S
2)
2m
a0be greater than loudspeaker vibrating body same mass M of shaking dorsad
mR2, total equivalent MM of speaker system with precision circular-tube compound channel increases, and now the former loud speaker same mass M MR2 that shakes dorsad is included in (S
1/ S
2)
2m
a0in, namely now, the total equivalent oscillating mass MM=M1+M2+MMR1+(S of speaker system with precision circular-tube compound channel
1/ S
2)
2m
a0, be greater than the total equivalent oscillating mass MM=M1+M2+MMR1+MMR2 of loud speaker when not having accurate ring sleeve, visible, because adding (a S in speaker system with precision circular-tube compound channel
1/ S
2)
2m
a0value, makes the low-frequency resonant frequencies omega of loud speaker
0diminish, system creates the resonance frequency of lower power, can give off the sound of more low frequency.
Claims (10)
1. speaker system with precision circular-tube compound channel, comprise cone loudspeaker (1), described cone loudspeaker (1) involving vibrations body cone (1-2) and the frame (1-1) with radiation port, described frame (1-1) is made up of frame chassis, frame sidewall, frame sidewall front end is with flanging, and the rear end of described frame (1-1) is provided with circular magnet (1-3); Also comprise the second inner sleeve (2) on excircle that front end is arranged on circular magnet (1-3) and coaxial with circular magnet (1-3); Also comprise the outer tube (3) coaxial with the second inner sleeve (2), the radiation port of frame (1-1) is positioned at the inside of outer tube (3); Form ring pipe passage (4) between the outer wall of the second inner sleeve (2) and the inwall of outer tube (3), it is characterized in that:
Also comprise first inner sleeve (5) of one section of axle centered by vibrating body cone (1-2) axis (O), between the rear end root that the front end of the first inner sleeve (5) is airtight is connected to frame (1-1) to radiation port back edge, first inner sleeve (5) rear end aligns with the second inner sleeve (2) front end and is connected, between the rear end root and the second inner sleeve (2) of frame (1-1), form level and smooth transition face.
2. speaker system with precision circular-tube compound channel according to claim 1, it is characterized in that: the intersecting lens crossing the section of circular magnet (1-3) axis (O) and the outer wall of the second inner sleeve (2) side is L1, and the intersecting lens of outer tube (3) inwall of described section and L1 the same side is L2; L1 and L2 is parallel to each other.
3. speaker system with precision circular-tube compound channel according to claim 1 and 2, it is characterized in that: trend is installed in ring pipe passage (4) and moves towards some groups of consistent block pieces with ring pipe passage (4), block piece is solid or is obturator, be transaudient passage between adjacent block piece, each transaudient passage has consistent cross-sectional area along its transaudient trend.
4. speaker system with precision circular-tube compound channel according to claim 1 and 2, it is characterized in that: described frame sidewall laminating is arranged on the inwall of outer tube (3), being connected with some brace rods between described frame chassis and sidewall, is radiation port between adjacent supports muscle.
5. speaker system with precision circular-tube compound channel according to claim 3, it is characterized in that: described frame sidewall laminating is arranged on the inwall of outer tube (3), being connected with some brace rods between described frame chassis and sidewall, is radiation port between adjacent supports muscle.
6. speaker system with precision circular-tube compound channel according to claim 1 and 2, is characterized in that: be annular space (10) between outer tube (3) and the first inner sleeve (5); The length of the first inner sleeve (5) and the length of described annular space (10) are all less than or equal to 1/10 of the low-frequency resonant wave length of sound of speaker system.
7. speaker system with precision circular-tube compound channel according to claim 3, is characterized in that: be annular space (10) between outer tube (3) and the first inner sleeve (5); The length of the first inner sleeve (5) and the length of described annular space (10) are all less than or equal to 1/10 of the low-frequency resonant wave length of sound of speaker system.
8. speaker system with precision circular-tube compound channel according to claim 1 and 2, is characterized in that: ring pipe passage is provided with damping material in (4).
9. speaker system with precision circular-tube compound channel according to claim 3, is characterized in that: ring pipe passage is provided with damping material in (4).
10. speaker system with precision circular-tube compound channel according to claim 2, it is characterized in that: angle α=90 ° between L1, L2 and axis (O), the first inner sleeve (5), outer tube (3) and the second inner sleeve (2) are annular flat tabular or outer tube (3) and the second inner sleeve (2) and are annular flat tabular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577138.9A CN103096233B (en) | 2012-12-27 | 2012-12-27 | Precise ring-shaped tube composite channel speaker system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577138.9A CN103096233B (en) | 2012-12-27 | 2012-12-27 | Precise ring-shaped tube composite channel speaker system |
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| CN103096233A CN103096233A (en) | 2013-05-08 |
| CN103096233B true CN103096233B (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210577138.9A Active CN103096233B (en) | 2012-12-27 | 2012-12-27 | Precise ring-shaped tube composite channel speaker system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000125387A (en) * | 1998-10-14 | 2000-04-28 | Pioneer Electronic Corp | Speaker device |
| CN1437427A (en) * | 2002-02-08 | 2003-08-20 | 石丰山 | New-type loudspeaker system |
-
2012
- 2012-12-27 CN CN201210577138.9A patent/CN103096233B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000125387A (en) * | 1998-10-14 | 2000-04-28 | Pioneer Electronic Corp | Speaker device |
| CN1437427A (en) * | 2002-02-08 | 2003-08-20 | 石丰山 | New-type loudspeaker system |
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| Publication number | Publication date |
|---|---|
| CN103096233A (en) | 2013-05-08 |
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