CN103024641B - Loudspeaker system with backward precision annular-tube combined channel set - Google Patents
Loudspeaker system with backward precision annular-tube combined channel set Download PDFInfo
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- CN103024641B CN103024641B CN201210577113.9A CN201210577113A CN103024641B CN 103024641 B CN103024641 B CN 103024641B CN 201210577113 A CN201210577113 A CN 201210577113A CN 103024641 B CN103024641 B CN 103024641B
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Abstract
The invention discloses a high-performance mid-bass loudspeaker system, namely a loudspeaker system with a backward precision annular-tube combined channel set. A set of annular short tubes for radiating sound of a mid-bass cone loudspeaker is mounted upwards behind the loudspeaker to form a combined channel, a sound radiation environment of a vibrator is limited, vibration radiation is influenced, when the loudspeaker operates at low frequency, a precision annular-tube combined channel is composed of an annular-tube acoustic transformer composed of an annular interval even in cross section and an annular-tube acoustic quality element composed of an annular channel even and constant in cross section, total equivalent vibration quality of the loudspeaker is increased by interaction of the acoustic transformer with the acoustic quality element, and low-frequency resonance frequency of the loudspeaker can be lowered. The inside of the channel set is smooth and clean, the loudspeaker is surrounded in a large range, interference of the surface of the vibrator by vibration of air in a box is reduced, surface load of the vibrator is even, dynamic response speed is convenient to increase, distortion is reduced, and medium- and low-frequency radiation efficiency is improved.
Description
technical field:
The backward accurate ring pipe composite channel group speaker system of the present invention, belongs to electroacoustic techniques field.
background technology:
In daily life, people are often with the loud speaker sound of resetting.Bass cone loudspeaker in conventional electrodynamic type (comprises bass, middle bass, Squawker and full range speaker, below also referred to as loud speaker) complete after, the resonance frequency omega 0 of the resonator system of its low frequency power has just been determined, ω 0 has determined the lower limit of this speaker playback sound frequency, and conventionally to be arranged on the loud speaker of working on infinitely great baffle as reference, loud speaker frequencies omega is described
0etc. index.In this case, be placed in the loud speaker on infinitely great baffle, directly the air of former and later two directions carried out to free radiation and transmit sound.
Conventionally can only not utilize the baffle sound of resetting with such loud speaker, at that rate, the sound wave of the single spin-echo that former and later two directions of loudspeaker vibrating body give off, can aloft mix mutually and offset loss loud speaker sound reproduction ability.When use, loud speaker can not be arranged on infinitely great baffle and use, and it always, together with audio amplifier, utilizes the baffle of sound box to cut apart, 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 is contained in when forming sound box system on audio amplifier and using, the loud speaker entrained acoustic energy of radiated wave is behind subject to the encirclement of casing, could not in casing, exhale, can not directly be utilized, and these sound waves are affected by reflex back and forth to the vibrating body of loud speaker by loudspeaker box internal environment also can, and the acoustic pressure of reflected wave, can disturb the vibration of loudspeaker vibrating body, further affect ability and the effect of loud speaker radiation sound, and, it is nearer for these object distance of loud speaker surrounding environment, affects also larger.The impact of this surrounding enviroment on loud speaker radiation, be embodied in and changed the total equivalent MM of loud speaker, the numerical value of CM, also affected the low-frequency resonant frequency of loud speaker, therefore, the low-frequency range of speaker playback sound in sound box system is to be determined by loud speaker and sound box two aspect factors.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, can make ω 0 decline, the loud speaker more bass of can resetting out.
But actual conditions are contrary.Conventionally when loud speaker is external according to forward, dorsad the traditional approach of radiation sound in casing is arranged on the audio amplifier of common structure and is used, can not effectively 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 improves the low-limit frequency of the sound that sound box system is reset out than the resonance frequency omega of single loud speaker 0, 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, in the time that loudspeaker vibrating body works in low frequency, it is just as a resilient spring, give from behind resiliency supported of loudspeaker vibrating body, from loud speaker outside limits the resonance of its vibrating body, make the moving difficulty that becomes of loud speaker low-frequency resonant, can not promote the original many like that sound of air radiation, therefore its low-frequency resonant frequency raises.Conventionally, sound box volume is less, and the elasticity that casing air produces is larger, compliance less (its coefficient of elasticity equals the inverse of compliance coefficient), and vice versa.The elastic reaction of this acoustic compliance element of casing air, show in superincumbent calculating formula, this acoustic compliance element while being exactly low frequency, equivalent parallel is to the existing mechanical compliance element of loud speaker itself, make loudspeaker vibrating body increase " bullet " property, " suitable " property that has reduced the total equivalent force CM of vibrating body, causes its ω 0 to raise.This situation is in common sound box system, in the audio amplifiers such as airtight audio amplifier, reflex cabinet, all like this.That is, be combined formed sound box system with traditional loudspeaker box structure according to traditional loud speaker and occupation mode thereof, cannot in use reduce the low-frequency resonant frequency of finished product loud speaker.
Therefore, allowing traditionally sound box system playback high-fidelity, the most popular method of lower frequency sounds more, is to adopt bigbore woofer.Heavy caliber woofer cone area is larger, can promote more air vibration radiation, and 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 increase loudspeaker vibration weight reduces the way of loud speaker frequency, mean and promote this loud speaker with 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 its vibration to produce larger motive force, therefore the production of this method and use cost are very high, and produce, debug also more complicated.During with heavy caliber woofer playback middle pitch, also can make dynamic response 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 simultaneously, reset respectively bass and middle pitch, but this causes higher cost and workload.
And, conventionally when common medium and low spectrum loudspeaker is arranged on while using on sound box, impact for fear of casing standing internal wave on loud speaker, loud speaker is not arranged on the middle of casing baffle conventionally, and in this kind of situation lower box, to impose on the interference that vibrating body goes up be dorsad unbalanced to the reflected wave of various frequencies, and this has also affected the load balancing of vibrating body, can affect its flexible vibratory, reduce reaction speed, the interference of reflected wave to 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 that utilizes speaker operation loud speaker in the time of 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 that is 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 " be loudspeaker vibrating body a transaudient sleeve channel has been installed dorsad, for radiation, transmit loud speaker sound dorsad.Because this passage is to be connected on loud speaker unique passage of outside radiation sound dorsad, therefore, the vibration radiation energy of loud speaker, by the air load being applied between sleeve pipe.
In " a kind of New-type loudspeaker system " when speaker operation is during in low frequency, loud speaker is to one section of narrow space before transaudient sleeve pipe, form an acoustic compliance element CA, and be socketed in the air part of the annular space that between inside and outside two pipes on loud speaker, sectional area is identical, form acoustic mass element.Now, from structure, " a kind of New-type loudspeaker system ", it is mainly the complex sound structure that loud speaker and an acoustic compliance element of a low frequency operation and acoustic mass element are connected formation mutually, when speaker operation is during in low frequency, this is connected on the loud speaker acoustic mass of the acoustic mass element in passage 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.Known according to above-mentioned loud speaker low-frequency resonant frequency formula, this can reduce loud speaker low frequency power resonance frequency, causes loud speaker to give off than original lower low-frequency sound.
When " a kind of New-type loudspeaker system " being installed to while using in loudspeaker box, because being subject to transaudient sleeve pipe dorsad, surrounds on a large scale loudspeaker vibrating body, this has been avoided the reflective sound wave of various frequencies in casing to comprise that standing wave directly acts on vibrating body largely, this can improve the antijamming capability of loud speaker, and keep the loud speaker uniform balance of acoustic load dorsad, be conducive to improve the reaction speed of vibrating body.Particularly importantly, this acoustic mass only just exists during in low frequency in speaker operation, enter intermediate frequency operation interval once loud speaker departs from low frequency, this heavier load of the acoustic mass in transaudient sleeve pipe also just disappears, and loudspeaker vibrating body still can normally be worked like a cork.Visible, this structure has also solved well and has improved the ability of playback bass and the speed issue of playback middle pitch.
Conventionally, due to speaker system is reset in most cases middle bass music, song, seldom long time continuous working is in bass state, therefore the acoustic mass existing in transaudient sleeve channel when " a kind of New-type loudspeaker system " is by low frequency operation improves the total equivalent oscillating mass MM of loud speaker, reduce the method for common finished product medium and low spectrum loudspeaker low-frequency resonant frequency, the utmost point has essential meaning, than common woofer, this way had both been saved a large amount of precious materials, affect hardly again loud speaker intermediate frequency one with operating rate.Therefore, no matter " a kind of New-type loudspeaker system " is being realized on bass technical method, or aspect the structure of speaker system, all not identical with common medium and low spectrum loudspeaker, it has developed medium and low spectrum loudspeaker technology.
By " a kind of New-type loudspeaker system " further studied and found, the transaudient passage of this speaker system structurally also exists some problems, the performance that this has affected this systematic function and ability, is necessary its Improvement and perfection, to further improve performance and the function of system.
Because with performance and the function of " a kind of New-type loudspeaker system " of radiant transfer passage, relevant with structure and the internal environment of its acoustic radiating transmission channels, according to this principle, we in the front of loud speaker to loudspeaker design one group for transmitting the passage of radiative acoustic wave of speaker cones forward direction, form a kind of new speaker system, for reducing the low-frequency resonant frequency of loud speaker, and promote loud speaker in, the radianting capacity of low frequency, the performance that promotes loud speaker, Here it is
backward accurate ring pipe composite channel group speaker system.But, due to the sagittal environment difference of loud speaker, therefore this group radiation channel that is based upon loud speaker front, loud speaker transaudient sleeve channel structure is dorsad also different from being based upon in " a kind of New-type loudspeaker system ", and its using method and function are also variant.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of and be built into together with a loud speaker by accurate ring pipe passage group
backward accurate ring pipe composite channel group speaker system, in order to reduce the low-frequency resonant frequency of loud speaker,
bass tonequality in improvement,make this system have fidelity more in, low-frequency sound, improve loud speaker in, low frequency radiation-efficiency.Existing to overcome
speaker systemdefect.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Backward accurate ring pipe composite channel group speaker system, comprises cone loudspeaker, described cone loudspeaker involving vibrations cone and the basin frame with radiation port, and the basin frame sidewall front end of described basin frame is with flanging; The rear end of described basin frame is provided with circular magnet; Also comprise that front end is arranged on the excircle of circular magnet and second inner sleeve coaxial with circular magnet; Also comprise the outer tube coaxial with the second inner sleeve, the radiation port of basin frame is positioned at the inside of outer tube; It is characterized in that: also comprise at least one intermediate casing between outer tube and the second inner sleeve, intermediate casing is coaxial with circular magnet; The front end of intermediate casing is positioned at front and close this peak swing place at vibration cone peak swing place; Between intermediate casing, outer tube and the second inner sleeve, be connected to each other; Between intermediate casing, outer tube and the second inner sleeve, form at least bipassage ring shape passage.
Also comprise the first inner sleeve of one section of axle centered by the axes O of vibrating body cone, the airtight rear end root that is connected to basin frame of front end of the first inner sleeve is between radiation port back edge, the first inner sleeve rear end aligns and is connected with the second inner sleeve front end, between the rear end of basin frame root and the second inner sleeve, forms level and smooth transition face.
The intersecting lens of crossing between section and the second inner sleeve one side outer wall of described axes O is L1, and between described section and outer sleeve inner wall and intersecting lens L1 the same side are L2; The intersecting lens with L1 the same side between the inwall of described section and intermediate casing 12 and outer wall is respectively L3, L4; L1, L2, L3, L4 are parallel to each other.
In the circular passage between the outer wall of the second inner sleeve and the intermediate casing adjacent with the second inner sleeve, be provided with circular passage and move towards consistent several block pieces, or in each circular passage, be all provided with circular passage and move towards consistent several block pieces; Block piece is solid or is obturator, between adjacent two block pieces, is transaudient passage, and each transaudient passage has consistent cross-sectional area along its transaudient direction.
Between intermediate casing, the second inner sleeve and the outer tube of the first inner sleeve periphery, it is annular space; The length of annular space and described circular passage be all less than or equal to speaker system low-frequency resonant wave length of sound 1/10.
Angle α=90 ° between L1, L2, L3, L4 and axes O, it is tabular that the first inner sleeve, the second inner sleeve and outer tube are annular flat.
Damping material is installed in circular passage.
Good effect of the present invention is: the backward accurate ring pipe composite channel group speaker system of the present invention, combine with one group of backward accurate ring pipe composite channel group by loud speaker, construct a kind of new speaker system, make this loud speaker, performance boost, function increases, and usage is flexible and changeable.
1, the ring pipe acoustic transformer element of one group of precision of structure, and create one group of accurate ring pipe composite channel.
Common acoustic transformer is one and imports and exports the different hollow container of area, ring pipe acoustic transformer in the backward accurate ring pipe composite channel group speaker system of the present invention is one group of acoustic transformer, it is to be made up of the annular space between one group of adjacent internal and external casing, it is different from general acoustic transformer structure, wherein each annular space and be attached thereto logical circular passage, form accurate ring pipe composite channel, these accurate ring pipe composite channels form accurate ring pipe composite channel group together.
2, accurate ring pipe composite channel group is combined with loud speaker, be arranged on loud speaker dorsad, just construct accurate ring pipe composite channel group speaker system dorsad, in the time that ring pipe passage is an acoustic mass element, the equivalent sound quality of the ring pipe acoustic mass element group in system, can increase total equivalent mass of loud speaker, this can reduce the low-frequency resonant frequency of loud speaker, than the transaudient sleeve channel in " a kind of New-type loudspeaker system ", the distortion and the energy loss that do not have reflecting surface to cause due to the inner brilliance of accurate ring pipe composite channel group, greatly improve the amplitude-frequency characteristic of the medium and low frequency of speaker system output, make amplitude-frequency characteristic more level and smooth, sound is fidelity more.Accurate ring pipe composite channel group internal structure is regular, and major parameter is wherein programmable very accurate, is conducive to industrial standardization and produces.Be combined by accurate ring pipe composite channel group the accurate ring pipe composite channel group speaker system dorsad forming with loud speaker, can further reduce the low-frequency resonant frequency of loud speaker.
Conventionally the ring pipe acoustic transformer in one group of ring pipe composite channel of inner side can easily be obtained larger no-load voltage ratio, now utilize the acoustic mass in this passage, can make speaker system increase a larger equivalent sound quality, reduce the low-frequency resonant frequency of loud speaker.
Accurate ring pipe composite channel inside is bright and clean, and loud speaker is surrounded on a large scale, has reduced vibrating body surface and be subject to the direct interference of air vibration in casing, and vibrating body surface loading is even, is beneficial to and improves dynamic response speed, reduce distortion.
The particularly important is, now when all other internal and external casing passages are one group of parallel passages, and when the sectional area of each circular passage itself is identical, the sound wave of each circular passage internal delivery, it is mainly the sound wave that the positive front end in feeder connection place gives off corresponding to the annular vibration plane on cone basin, when the radiation direction of annular vibration plane on cone basin is basic while moving towards to be close with these respective annular passages, what can think each circular passage internal delivery is the plane wave being given off by annular vibration plane, and therefore and also speaker system has further improved the efficiency of radiation intermediate frequency.
3, improve the formation method of the acoustic mass element of other several primary structures of acoustic radiating passage, make the structural change of backward accurate ring pipe composite channel group speaker system many, usage is more flexible.
In " a kind of New-type loudspeaker system ", in the time that the sound pipe of the transaudient passage of formation is shaped as expand outwardly round table-like, will change along the annulus area of channel direction, now the acoustic mass element between internal and external casing will not exist.In order to make now still to have acoustic mass element in ring pipe 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 backward accurate ring pipe composite channel group speaker system is by even, the identical straight circular air duct of one section of sectional area forming between adjacent internal and external casing.For other needs, the also ring pipe passage of truncated conical shape, but can not directly form an acoustic mass element in this structure space, need re-construct the acoustic mass element in this passage.For this reason, rear in accurate ring pipe composite channel group speaker system, also further expand, perfect when passage be a round table-like ring pipe passage, and even the table top of this round table-like ring pipe passage further expansion makes the inside and outside tube wall of passage be expanded to plan position approach, become inside and outside parallel plane plectane, be round table-like ring pipe passage while becoming two passages between plane plectane, the generation type of interchannel acoustic mass element.These above-mentioned variations have ensured accurate ring pipe composite channel shape and have applied more versatile and flexible.
For this reason, the backward accurate ring pipe composite channel group speaker system of the present invention, by increase the some groups of block pieces that trend is consistent with ring pipe passage in every group of sound passage, make between every group of block piece is enclosure space, between two adjacent groups block piece, form new transaudient passage, and make each transaudient passage there is consistent cross-sectional area along its trend, even if round table-like sound pipe has the different angles that expands outwardly, in the annular space forming between two pipes, can construct simply, neatly acoustic mass element, fall low-frequency requirement to meet.Equally, in the time that round table-like ring pipe passage becomes two passages between plane plectane because of the increase of the large table top of passage, between two plectanes, also can re-construct in this way acoustic mass element.
Visible taking after these measures, expand, the constituted mode of acoustic mass element in perfect passage, fundamentally ensure sound mass elements existence all the time in passage, the effect that this has just ensured the reduction power resonance frequency of accurate ring pipe composite channel structure of loudspeaker system, has improved in loud speaker radiation, ability and the efficiency of low-frequency sound.And it is more flexible, free that channel shape is selected, and makes its structure have adaptability widely.
4, in ring pipe passage, increased damping material, the damping of the backward accurate ring pipe composite channel group speaker system of flexible
Damping situation in " a kind of New-type loudspeaker system ", depends on three the main aspects of air in impact and the casing of damping, sound passage of loud speaker, and it is very not convenient to regulate, and this has limited the Application Range of loud speaker.In order to utilize more neatly existing height damping value loud speaker, the present invention can be in ring pipe passage or the port of export increased damping material, in order to regulate if desired the damping of backward accurate ring pipe composite channel group speaker system.
5, the present invention directly can be used without the audio amplifier of sound box easily as one.
brief description of the drawings:
Fig. 1 structural representation of the present invention.
Embodiment
Further describe the present invention below in conjunction with accompanying drawing and instantiation.
As shown in Figure 1, the present invention includes cone loudspeaker 1, described cone loudspeaker 1 involving vibrations cone 1-2 and the basin frame 1-1 with radiation port, the basin frame sidewall front end of described basin frame 1-1 is with flanging; The rear end of basin frame 1-1 is connected with circular magnet 1-3.1-2 is coaxial with circular magnet 1-3 for vibration cone.
Also comprise that front end is arranged on the excircle of circular magnet 1-3 and second inner sleeve 2 coaxial with circular magnet 1-3; Also comprise the outer tube 3 coaxial with the second inner sleeve 2, the radiation port of basin frame 1-1 is positioned at the inside of outer tube 3; Also comprise at least one intermediate casing 12 between outer tube 3 and the second inner sleeve 2, intermediate casing 12 is coaxial with circular magnet 1-3; The front end of intermediate casing 12 is positioned at front and close this peak swing place at vibration cone 1-2 peak swing place; Between intermediate casing 12, outer tube 3 and the second inner sleeve 2, be connected to each other; Between intermediate casing 12, outer tube 3 and the second inner sleeve 2, form at least bipassage ring shape passage 4.
Also comprise the first inner sleeve 5 of one section of axle centered by the axes O of vibrating body cone 1-2, the airtight rear end root that is connected to basin frame 1-1 of front end of the first inner sleeve 5 is between radiation port back edge, the first inner sleeve 5 rear ends align and are connected with the second inner sleeve 2 front ends, between the rear end root of basin frame 1-1 and the second inner sleeve 2, form level and smooth transition face.
The intersecting lens of crossing between section and the second inner sleeve 2 one side outer walls of described axes O is L1, and the intersecting lens with L1 the same side between described section and outer tube 3 inwalls is L2; The intersecting lens with L1 the same side between the inwall of described section and intermediate casing 12 and outer wall is respectively L3, L4; L1, L2, L3, L4 are parallel to each other.
In the circular passage 4 between the outer wall of the second inner sleeve 2 and the intermediate casing 12 adjacent with the second inner sleeve 2, be provided with circular passage 4 and move towards consistent several block pieces, or interior being all provided with circular passage 4 in each circular passage 4 moved towards consistent several block pieces; Block piece is solid or is obturator, between adjacent two block pieces, is transaudient passage, and each transaudient passage has consistent cross-sectional area along its transaudient direction.
Between intermediate casing 12, the second inner sleeve 2 and the outer tube 3 of the first inner sleeve 5 peripheries, it is annular space 10; The length of annular space 10 and described circular passage 4 be all less than or equal to speaker system low-frequency resonant wave length of sound 1/10.
Angle α=90 ° between L1, L2, L3, L4 and axes O, it is tabular that the first inner sleeve 5, the second inner sleeve 2 and outer tube 3 are annular flat.
In circular passage 4, damping material is installed.
The operation principle of backward accurate ring pipe composite channel group speaker system:
In backward accurate ring pipe composite channel group speaker system, the sound wave that the backward radiation of loudspeaker vibrating body cone goes out enters annular space and outputs to outside passage through the port of export of ring pipe passage, therefore the air in passage becomes a part for this speaker system, in arbitrary moment, the air in passage becomes the most direct load of vibrating body.Because accurate ring pipe composite channel is narrow short, when speaker operation is during 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, the now air load in pipe is strengthened the reaction of loudspeaker vibrating body, and backward accurate ring pipe composite channel group speaker system has produced stronger acoustic radiation.
Because the internal and external casing of looping space and ring pipe passage is all short tube, therefore annular space is all jitty.Be accurate ring pipe composite channel, be by some for the 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 be less than the low-frequency sound wave wavelength that passes through in this tube passage 1/10 time, this passage is jitty.When design; conventionally the cross-sectional area difference of the import and export of annular space passage; the cross-sectional area that ring pipe passage is imported and exported is identical; backward accurate ring pipe composite channel group speaker system now; when speaker operation is during 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 pass through the mechanical impedance at its its two ends of no-load voltage ratio change sound, convert acoustic mass element and act 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 total equivalent mass of loud speaker, this can reduce the low frequency power resonance frequency of loud speaker, improves loud speaker low frequency radiation-efficiency.For " a kind of New-type loudspeaker system ", owing to making acoustic transformer with this smooth ring pipe passage, greatly reduce sound wave by its inner energy loss, make the acoustic transformer of this structure can do very accurately.
In backward accurate ring pipe composite channel group speaker system, acoustic mass only just exists during in low frequency in speaker operation, once loud speaker departs from low frequency operation interval, this acoustic mass also just disappears, and loudspeaker vibrating body still can normally be worked like a cork.
Only to have the accurate ring pipe composite channel group speaker system of inside and outside two sleeve pipes formation as example, rear in accurate ring pipe composite channel group speaker system, only has the friction loss between the interior air of passage and whole accurate ring pipe composite channel tube wall, and because annular space and passage have identical coefficient of friction, and become a common acoustic loss element R by equivalence
a2(inner air tube motion forms with the viscous friction of tube wall).That is, improve this backward accurate ring pipe composite channel group speaker system forming through above several respects, the transaudient passage of its radiation is a complex sound structure that comprises 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 relation in parallel 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 that this is connected on the mechanical impedance change action of the acoustic transformer between loud speaker harmony mass elements, also will further increase acoustic mass equivalent action in the passage same quality of shaking on loudspeaker vibrating body.
Be calculated as follows:
If outer tube is area is S
1round straight tube, simultaneously S
1also the effective vibrating body area while being loud speaker low frequency, ring pipe passage is straight channel, area is S
2, length is for L
2.The quality .M of air in the passage that area is S2
mA0=S
2* L
2* ρ
0, acoustic mass M
a0=M
mA0/ S
2 2=ρ
0l
2/ S
2, air quality, the acoustic mass of viewability channel are all directly proportional to the length of this passage, and its interior acoustic mass 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 long-pending ring pipe passage of small cross sections is larger.
M
a0normalize to the S of loud speaker
1the equivalent mass of face is (S
1/ S
2)
2m
a0, wherein S1/S2 is the no-load voltage ratio of ring pipe acoustic transformer.Conventionally S
1be greater than S
2when time more easily ensures passage medium and low frequency, there is acoustic mass element, therefore in application, make S
1be greater than S
2, now (S
1/ S
2)
2m
a0be greater than M
a0.The equivalent sound quality that, transforms to the passage on loudspeaker vibrating body through annular space acoustic transformer has improved greatly.
From speaker system low-frequency resonant formula ω 0=, now the total equivalent mass MM of electrodynamic loudspeaker system comprises the equivalence value (S of cone basin equivalent mass, voice coil loudspeaker voice coil equivalent mass, the positive acoustic mass with the quality of shaking, the back side same shake quality and ring pipe acoustic mass element of vibrating body
1/ S
2)
2m
a0, according to the feature of vibrating body radiation in sound pipe, in whole sound pipe, comprising the loud speaker same mass M MR2 that shakes dorsad, as long as in practical application, accurate ring pipe composite channel is a jitty, therefore the M of the acoustic mass of ring pipe acoustic mass passage
a2equivalent mass (S
1/ S
2)
2m
a0be greater than the loudspeaker vibrating body same mass M of shaking dorsad
mR2, total equivalent MM of accurate ring pipe composite channel speaker system increases, and now the former loud speaker same mass M MR2 that shakes is dorsad included in (S
1/ S
2)
2m
a0in, now, the total equivalent oscillating mass MM=M1+M2+MMR1+(S of accurate ring pipe composite channel speaker system
1/ S
2)
2m
a0, be greater than the total equivalent oscillating mass MM=M1+M2+MMR1+MMR2 of loud speaker while thering is no accurate ring sleeve, visible, in accurate ring pipe composite channel speaker system because having increased (a S
1/ S
2)
2m
a0be worth, make the low-frequency resonant frequencies omega of loud speaker
0diminish, system has produced the resonance frequency of lower power, can give off the more sound of low frequency.
Claims (10)
1. backward accurate ring pipe composite channel group speaker system, comprise cone loudspeaker (1), described cone loudspeaker (1) involving vibrations cone (1-2) and with the basin frame (1-1) of radiation port, the basin frame sidewall front end of described basin frame (1-1) is with flanging; The rear end of described basin frame (1-1) is provided with circular magnet (1-3); Also comprise that front end is arranged on the excircle of circular magnet (1-3) and second inner sleeve (2) coaxial with circular magnet (1-3); Also comprise the outer tube (3) coaxial with the second inner sleeve (2), the radiation port of basin frame (1-1) is positioned at the inside of outer tube (3); It is characterized in that: also comprise at least one intermediate casing (12) being positioned between outer tube (3) and the second inner sleeve (2), intermediate casing (12) is coaxial with circular magnet (1-3); The front end of intermediate casing (12) is positioned at front and close this peak swing place at vibration cone (1-2) peak swing place; Between intermediate casing (12), outer tube (3) and the second inner sleeve (2), be connected to each other; Between intermediate casing (12), outer tube (3) and the second inner sleeve (2), form at least bipassage ring shape passage (4).
2. backward accurate ring pipe composite channel group speaker system according to claim 1, is characterized in that: also comprise one section with
vibration cone(1-2)
axis (O)centered by first inner sleeve (5) of axle, the airtight rear end root that is connected to basin frame (1-1) of front end of the first inner sleeve (5) is between radiation port back edge, the first inner sleeve (5) rear end aligns and is connected with the second inner sleeve (2) front end, between the rear end root of basin frame (1-1) and the second inner sleeve (2), forms level and smooth transition face.
3. backward accurate ring pipe composite channel group speaker system according to claim 2, is characterized in that: excessively
axis (O)section and the second inner sleeve (2) one side outer walls between intersecting lens be L1, the intersecting lens with L1 the same side between described section and outer tube (3) inwall is L2; The intersecting lens with L1 the same side between the inwall of described section and intermediate casing 12 and outer wall is respectively L3, L4; L1, L2, L3, L4 are parallel to each other.
4. backward accurate ring pipe composite channel group speaker system according to claim 1 and 2, it is characterized in that: in the circular passage (4) between the outer wall of the second inner sleeve (2) and the intermediate casing (12) adjacent with the second inner sleeve (2), be provided with circular passage (4) and move towards consistent several block pieces, or in each circular passage (4), be all provided with circular passage (4) and move towards consistent several block pieces; Block piece is solid or is obturator, between adjacent two block pieces, is transaudient passage, and each transaudient passage has consistent cross-sectional area along its transaudient direction.
5. backward accurate ring pipe composite channel group speaker system according to claim 3, it is characterized in that: in the circular passage (4) between the outer wall of the second inner sleeve (2) and the intermediate casing (12) adjacent with the second inner sleeve (2), be provided with circular passage (4) and move towards consistent several block pieces, or in each circular passage (4), be all provided with circular passage (4) and move towards consistent several block pieces; Block piece is solid or is obturator, between adjacent two block pieces, is transaudient passage, and each transaudient passage has consistent cross-sectional area along its transaudient direction.
6. backward accurate ring pipe composite channel group speaker system according to claim 2, is characterized in that: between intermediate casing (12), the second inner sleeve (2) and the outer tube (3) of the first inner sleeve (5) periphery, be annular space (10); The length of annular space (10) and described circular passage (4) be all less than or equal to speaker system low-frequency resonant wave length of sound 1/10.
7. backward accurate ring pipe composite channel group speaker system according to claim 3, is characterized in that: between intermediate casing (12), the second inner sleeve (2) and the outer tube (3) of the first inner sleeve (5) periphery, be annular space (10); The length of annular space (10) and described circular passage (4) be all less than or equal to speaker system low-frequency resonant wave length of sound 1/10.
8. backward accurate ring pipe composite channel group speaker system according to claim 4, is characterized in that: between intermediate casing (12), the second inner sleeve (2) and the outer tube (3) of the first inner sleeve (5) periphery, be annular space (10); The length of annular space (10) and described circular passage (4) be all less than or equal to speaker system low-frequency resonant wave length of sound 1/10.
9. backward accurate ring pipe composite channel group speaker system according to claim 3, is characterized in that: L1, L2, L3, L4 and
axis (O)between angle α=90 °, it is tabular that the first inner sleeve (5), the second inner sleeve (2) and outer tube (3) are annular flat.
10. backward accurate ring pipe composite channel group speaker system according to claim 1 and 2, is characterized in that: circular passage is provided with damping material in (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577113.9A CN103024641B (en) | 2012-12-27 | 2012-12-27 | Loudspeaker system with backward precision annular-tube combined channel set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577113.9A CN103024641B (en) | 2012-12-27 | 2012-12-27 | Loudspeaker system with backward precision annular-tube combined channel set |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103024641A CN103024641A (en) | 2013-04-03 |
| CN103024641B true CN103024641B (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210577113.9A Active CN103024641B (en) | 2012-12-27 | 2012-12-27 | Loudspeaker system with backward precision annular-tube combined channel set |
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| Country | Link |
|---|---|
| CN (1) | CN103024641B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19620010A1 (en) * | 1995-05-18 | 1996-11-21 | Bose Corp | Loudspeaker system with satellite housing |
| CN2532651Y (en) * | 2002-02-08 | 2003-01-22 | 石丰山 | Loudspeaker |
| CN1437427A (en) * | 2002-02-08 | 2003-08-20 | 石丰山 | New-type loudspeaker system |
-
2012
- 2012-12-27 CN CN201210577113.9A patent/CN103024641B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19620010A1 (en) * | 1995-05-18 | 1996-11-21 | Bose Corp | Loudspeaker system with satellite housing |
| CN2532651Y (en) * | 2002-02-08 | 2003-01-22 | 石丰山 | Loudspeaker |
| CN1437427A (en) * | 2002-02-08 | 2003-08-20 | 石丰山 | New-type loudspeaker system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103024641A (en) | 2013-04-03 |
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