CN102036150A - Combined type coaxial loudspeaker - Google Patents
Combined type coaxial loudspeaker Download PDFInfo
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- CN102036150A CN102036150A CN2009101771532A CN200910177153A CN102036150A CN 102036150 A CN102036150 A CN 102036150A CN 2009101771532 A CN2009101771532 A CN 2009101771532A CN 200910177153 A CN200910177153 A CN 200910177153A CN 102036150 A CN102036150 A CN 102036150A
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Abstract
The invention provides a combined type coaxial loudspeaker which comprises a main permanent magnet, an annular outer polar plate, an annular middle polar plate, an annular small permanent magnet, an annular inner polar plate and a hole, wherein the main permanent magnet is coaxially arranged on the bottom plate of T-shaped iron; the outer polar plate is coaxially arranged at the top of the annular main permanent magnet; the middle polar plate is coaxially arranged at the top of the mandrel column of the T-shaped iron; the small permanent magnet is coaxially arranged in the inner cavity of the annular middle polar plate; the inner polar plate is coaxially arranged at the top of the annular small permanent magnet; and the hole is coaxially arranged along the axial direction in the center of the mandrel column of the T-shaped iron, passes through the bottom plate of the T-shaped iron, is communicated with the inner cavity of the annular small permanent magnet and the inner cavity of the annular inner polar plate and has the effects of radiating head and facilitating to leading a voice coil. The invention has the advantages of high air gap magnetic field, low manufacturing cost, simple structure, convenience for large-scale operation like an automatic production line of ordinary loudspeakers, and the like.
Description
Technical field
The present invention relates to a kind of combined type coaxial loudspeaker, more particularly, relate to a kind of beyond the bass of magnetic structure and inner magnetic structure in/high pitch is compound in one and disposes the coaxial loudspeaker of formation.
Background technology
Loud speaker is commonly called as loudspeaker, is widely used in all kinds of electroacoustic equipments, comprises the fields such as sounding parts of various multimedia audio systems, computer, DVD, TV, phone, mobile phone, automobile and various industry and civilian instrument, equipment.
In order more clearly to set forth the present invention, below the general operation principle of loud speaker is described by accompanying drawing 1 earlier.Fig. 1 is the loud speaker schematic diagram of common external magnetic type structure.In Fig. 1,, represent the magnetic line of force path and the direction in magnetostatic loop of any one side-looking section of loud speaker with the dotted line of the closure of the arrow that superposeed by the method for expressing of this specialty routine.The permanent magnet 2 of annular, constitute magnetostatic loop with the external polar plate (being called outer washer again) 3 of T iron of making by soft magnetic material 1 and annular, form the air-gap field 4 of annular, when the voice coil 24 that places this air-gap field passes through tone currents, by Faraday's electromagnetic induction law and Ampere's law, air-gap field 4 will interact with the tone currents in the voice coil 24, thereby drives and 25 vibrations of voice coil 24 joining vibrating diaphragms (being commonly called as cone), externally sounds.This back wash effect is also multiple effectively to be that is to say, when vibrating diaphragm 25 receives sound wave and when vibrating, directly driving the voice coil 24 that is connected vibrates, and will produce the frequency induction electric current in the voice coil 24 in air-gap field 4.This back wash effect is exactly in the equipment such as microphone, mobile phone, phone, converts tones into the operation principle of current signal by loud speaker.So the loud speaker that is used in these equipment is called receiver again.So in the elaboration below the present invention, all relate to explanation when in the voice coil when the tone currents, be subjected to the effect of air-gap field and drive voice coil and vibrating diaphragm vibrates, and then during the operation principle of sounding, just mean the operation principle that its back wash effect receiver has been described simultaneously.
This shows that according to Faraday's electromagnetic induction law and Ampere's law, when other structure of loud speaker was constant, air-gap field was strong more, then the suffered actuating force of voice coil is just big more, and the sounding effect of loud speaker is just good more.The sounding effect of loud speaker is weighed with the noise sensitivity index usually, so the air-gap field of loud speaker is strong more, then sensitivity is high more.Therefore, the core texture of loud speaker is its air-gap field.
The loud speaker of another conventional structure as shown in Figure 2.Because each parts of common loud speaker such as permanent magnet, T iron, pole plate, air gap etc. all have simple circular projection profile, and the vibrational system that comprises voice coil, vibrating diaphragm, support (as 22 in the accompanying drawing 1), geometrical clamp (as 23 among Fig. 1) etc. all is the conventional structure of knowing altogether in this professional domain, so in Fig. 2, only need provide the end view of loadspeaker structure, and omitted the vertical view of loadspeaker structure, and the description of described vibrational system parts.The inventor thinks that this will help setting forth the present invention succinctly, legibly more, and can not produce any influence to the explanation of any essentiality content of the present invention.In Fig. 2, columniform permanent magnet 8 and columniform parallels 9, and the external polar plate 3 and the columniform internal polar plate 7 of cup-shaped outer yoke 10, annular constitute magnetostatic loop, forms the air-gap field 6 of annular.Because permanent magnet 8 is completely restricted in cup-shaped outer yoke 10, so structure as shown in Figure 2 is commonly referred to internal magnetic loudspeaker; And in the structure as shown in Figure 1, annular permanent magnet 2 does not have to be surrounded by the yoke of soft magnetism fully, and externally there is the part leakage flux in permanent magnet 2, usually it is referred to as outer-magnet speaker.
For application scenarios such as television set, automobile, instrument and meters, often need the leakage flux of outer-magnet speaker is done comparatively strict shielding processing, in order to avoid leakage field magnetic field produces harmful effect to other components and parts and surrounding environment.The usual method of the leakage flux of shielding outer-magnet speaker is that a cup-shaped yoke of making of soft magnetic material is set around T iron and annular permanent magnet; In addition, an auxiliary permanent magnet of annular that magnetic moment direction is opposite with main permanent magnet is installed in the bottom of T iron, being surrounded together with main permanent magnet of annular and the auxilliary permanent magnet of annular with cup-shaped yoke handle, also is the usual method of the leakage flux of the present shielding outer-magnet speaker that usually uses again.
We know that sound is to propagate with the form of medium ripple.Usually the range that people's ear can be differentiated is divided into three sections of high pitch, middle pitch and basses by the frequency of sound wave, and mid can be understood as the last extension of bass and the lower extension branch of high frequency audio: the frequency of sound wave is high more, and then wavelength is short more.This shows as in loud speaker: the frequency of sound wave is low more, and then the amplitude of voice coil loudspeaker voice coil is big more, and the size of vibrating diaphragm is also big more.Therefore, because the vibrating diaphragm size and the amplitude of the loud speaker (hereinafter to be referred as woofer) of generation low frequency sound wave are bigger, need bigger actuating force and vibrate size, vibrating diaphragm that quality is bigger, so the size of its voice coil loudspeaker voice coil is also thicker, bigger, this just requires the air gap size of woofer and magnetic field intensity all bigger; On the contrary, the vibrating diaphragm size and the amplitude of the loud speaker (hereinafter to be referred as high pitch loudspeaker) of generation high-frequency sound wave are less, the size of its vibrating diaphragm, voice coil loudspeaker voice coil, quality are all less, needed vibratory drive power is also less, like this, the air gap size of high pitch loudspeaker can be less, but in order to guarantee high noise sensitivity, require air-gap field intensity bigger equally; The feature that produces the loud speaker (hereinafter to be referred as Squawker) of intermediate frequency sound wave then is between high pitch and the woofer.
As seen from Figure 2, the upper limit of the outside dimension of cylindrical permanent magnet 8 is subjected to various restrictions: at first, the external diameter of permanent magnet 8 must be less than the internal diameter of cup-shaped outer yoke 10; Secondly, the external diameter of permanent magnet 8 generally also need be less than the internal diameter of annulus gap 6 so that be in voice coil loudspeaker voice coil up-down vibration freely in the air gap, and be unlikely to touch permanent magnet and produce causes of sound distortion.Therefore, because magnet size is little, the total magnetic flux that permanent magnet produced is little, and the loud speaker of internal magnetization structure as shown in Figure 2 only is suitable for making the less middle and high sound microphone device of air gap size usually.
Because the outside dimension of the annular permanent magnet 2 in the loud speaker of external magnetic type structure shown in Figure 1 is unrestricted, magnet size can be done greatlyyer, the total magnetic flux that permanent magnet produced is big, thus the loud speaker of external magnetic type structure as shown in Figure 1 be suitable for making require that the air gap size is big, air-gap field intensity is higher in, the bass microphone device.Certainly, higher because the cost of permanent magnet generally all compares, and annular permanent magnet 2 externally has the leakage flux loss in the loud speaker of external magnetic type structure as shown in Figure 1, taking cost into account, the loud speaker of external magnetic type structure is unwell to makes the high pitch microphone device.
Yet the sound that people's ear can be differentiated always has the full range band sound wave of high pitch, middle pitch and bass frequencies, if single woofer with an external magnetic type structure as microphone device, the high-frequency range section of sound will show deficiency; In like manner, if only with the high pitch loudspeaker of an internal magnetization structure as microphone device, then the low frequency range section of sound will show distortion.
The usual method that addresses this problem is that high pitch loudspeaker and woofer are installed in the audible device (as audio amplifier) simultaneously, by frequency divider tone currents is separated, high-frequency current is inserted the high pitch loudspeaker voice coil loudspeaker voice coil, low-frequency current is inserted the woofer voice coil loudspeaker voice coil.Like this, though the tonequality of sound has obtained improving significantly, but because high pitch loudspeaker and woofer are in the different geometric position of audible device respectively, still there are distortion to a certain degree in sound that audible device restored and practical natural sound.For example, whole sound sources of a singer's sound are all from a mouth---promptly a geometric point sends, and in the existing audio amplifier equipment, high pitch loudspeaker is in different geometric position sounding with woofer, this imitates the primary sound that a mouth sends with regard to being equal to the morbid sound of opening one's mouth to send more, and obviously can there be distortion to a certain degree in this.
In order to reduce primary sound to greatest extent, people have proposed the notion of coaxial loudspeaker: the high pitch loudspeaker that size is less is stacked in larger-size woofer center, and the rotation axes of symmetry of the two overlaps.Existing United States Patent (USP) U.S.Patent 3,665,124 adopt the internal magnetization structure, form outside and inside two magnetostatic loops in parallel with outer yoke, annular middle plate and internal polar plate respectively with an annular permanent magnet, outside magnetic flux partly forms the bass air-gap field, and inside magnetic flux part then forms the high pitch air-gap field.So just, can realize high pitch and bass air gap, just the high pitch voice coil loudspeaker voice coil is coaxial with the strictness of bass voice coil loudspeaker voice coil.But as mentioned before, the size of permanent magnet is restricted in the loud speaker of internal magnetization structure, can't realize existing higher high pitch air-gap field simultaneously, and higher bass air-gap field is arranged again.Particularly, the internal diameter of the annular permanent magnet of this patented technology can not be less than the external diameter of high pitch air gap, and the external diameter of annular permanent magnet can not be greater than the internal diameter of bass air gap, and this just makes the dimensional structure of this patented technology be very limited, and application surface seldom.If adopt the sintered Nd-Fe-B magnet of high magnetic characteristics, though can reach high pitch and the bass air-gap field that certain practical value is arranged reluctantly, cost is higher than two split type loud speakers with same high pitch and bass air-gap field far away.So this patent has never had practicability since 1972 disclose.United States Patent (USP) U.S.Patent 6,639,995 B2 and Chinese patent ZL01229591.4 also adopt the internal magnetization structure, form a magnetostatic loop of connecting with the annular middle plate and the internal polar plate of outer yoke and a plurality of arranged coaxial respectively with a cylindrical permanent magnet, except forming a normal bass air-gap field, also utilize the leakage flux of internal polar plate partly to form a plurality of air-gap fields that can be used for middle pitch and high pitch.There are two weakness in this technology: the one, and as mentioned before, the size of permanent magnet is restricted in the loud speaker of internal magnetization structure, can't realize existing higher high pitch air-gap field simultaneously, and higher bass air-gap field is arranged again; The 2nd, it utilizes the leakage flux part of internal polar plate to form a plurality of axial depth that can be used for the air-gap field of middle pitch and high pitch (but is voice coil loudspeaker voice coil vertically degree of depth of free vibration in air-gap field, be also referred to as stroke) too shallow, cause middle and high sound voice coil loudspeaker voice coil in vibration processes, to touch to be in the permanent magnet of air-gap field bottom easily, cause the serious distortion of sound.In addition, European patent EP 0 341 926 A1, United States Patent (USP) U.S.Patent 4,164,631, and Chinese patent ZL 01125945.0, ZL 97121874.9, ZL 92232080.2 is with a undersized middle pitch or high pitch loudspeaker, directly is stacked in the top or the bottom of another large-sized woofer coaxially, and middle pitch or high pitch loudspeaker and woofer have independently yoke separately.Though such technology has realized the practicality of small lot in recent years, its manufacturing cost all is higher than two split type loud speakers with same high pitch and bass air-gap field far away, and its application only limits to professional sound system special, small lot.Especially, this technology difficulty of directly coaxial closed assembly is carried out in two magnetostatic loops that have an independent yoke is big, and be difficult to two permanent magnets that have independent yoke are implemented to magnetize simultaneously, need many manual operationss, be not suitable for the operation in enormous quantities of the such automatic assembly line of similar ventional loudspeakers.
The Chinese patent 200910157932.6 that the inventor proposes provides a kind of simple in structure, manufacturing cost to be lower than two split type loud speakers with same high pitch and bass air-gap field, the combined type coaxial loudspeaker of being convenient to the advantages such as operation in enormous quantities of the such automatic assembly line of similar ventional loudspeakers.But there is the shortcoming of radiating effect deficiency in this combined type coaxial loudspeaker.This be because loud speaker in use the audio-frequency electric in the voice coil loudspeaker voice coil fail to be convened for lack of a quorum and produce a large amount of Joule heats, as if untimely heat is distributed, the temperature of each parts that comprises the loud speaker of permanent magnet can very fast rising, causes the sounding effect of loud speaker to descend, tonequality becomes bad.
Summary of the invention
The present invention proposes at the deficiencies in the prior art.Main purpose of the present invention provides a kind of simple in structure, manufacturing cost and is lower than two split type loud speakers with same high pitch and bass air-gap field, the combined type coaxial loudspeaker of being convenient to the advantages such as operation in enormous quantities of the such automatic assembly line of similar ventional loudspeakers, simultaneously, guaranteed loud speaker in use the joule heat energy in the voice coil loudspeaker voice coil in time distribute.
Above-mentioned purpose of the present invention is by the combined type coaxial loudspeaker is provided, and described combined type coaxial loudspeaker is included on the base plate of a T iron, and the main permanent magnet of an annular is set coaxially; At the top of the main permanent magnet of described annular, the external polar plate of an annular is set coaxially; In the axle column top of described T iron, the middle plate of an annular is set coaxially; At the inner chamber of the middle plate of described annular, the little permanent magnet of an annular is set coaxially; At the top of the little permanent magnet of described annular, the internal polar plate of an annular is set coaxially; Center at the axle post of described T iron is provided with a hole coaxially along axis direction, and this hole runs through the base plate of described T iron, and with the intracavity inter-connection of the internal polar plate of the inner chamber of the little permanent magnet of described annular, annular; Wherein, the external diameter of the axle post of described T iron less than/equal the external diameter of the middle plate of described annular, the height of the axle post of described T iron is less than the height sum of the two of the external polar plate of the height of the main permanent magnet of described annular and described annular, make simultaneously the height of the axle post of described T iron, described annular little permanent magnet height and the internal polar plate of annular height three sum greater than/equal the height sum of the two of the external polar plate of the height of main permanent magnet of described annular and described annular.
According to a preferred aspect of the present invention, the magnetic moment direction of the main permanent magnet of described annular is identical with the magnetic moment direction of the little permanent magnet of described annular.
According to another preferred aspect of the present invention, the height of the middle plate of described annular less than/equal the height sum of the two of the internal polar plate of the height of little permanent magnet of described annular and described annular; And, the external diameter of the little permanent magnet of described annular less than/equal the external diameter of the internal polar plate of described annular.
According to another preferred aspect of the present invention, on the base plate of described T iron, one or more holes that run through the base plate of described T iron are set, and make the position of these holes be between the internal diameter of main permanent magnet of the external diameter of axle post of described T iron and described annular, work to improve the heat radiation of bass voice coil loudspeaker voice coil.
Preferably, the side at the axle post of described T iron is provided with one or more holes, makes that the hole that is provided with coaxially along axis direction on the axle post of these holes and described T iron is connected, and works to improve the heat radiation of bass voice coil loudspeaker voice coil.
Preferably, the axle post of described T iron and the base plate of described T iron are two parts of split, connect by gluing or mechanical fixation method.
Preferably,, the cup-shaped shell of being made by soft magnetic material is installed, plays the effect of the external leakage field of main permanent magnet of the described annular of shielding at the plate outer side of described T iron; Perhaps, plate outer side at described T iron, the auxiliary permanent magnet of an annular opposite with the magnetic moment direction of the main permanent magnet of described annular is set coaxially, in the periphery of described T iron with the auxiliary permanent magnet of annular, the cup-shaped shell of being made by soft magnetic material is installed, plays external leakage field of main permanent magnet that shields described annular and the effect that increases the bass air-gap field.
According to another preferred aspect of the present invention, connect by gluing or mechanical fixation method between the cup-shaped shell of the internal polar plate of the base plate of the little permanent magnet of the main permanent magnet of described annular, the auxiliary permanent magnet of annular, annular, the axle post of T iron, T iron, the middle plate of annular, annular, the external polar plate of annular and described shielding action.
According to another preferred aspect of the present invention, making the main permanent magnet of described annular, the little permanent magnet of annular and the material of the auxiliary permanent magnet of annular is the sintered body or the cohesive body of neodymium-iron-boron, samarium-cobalt, ferrite, alnico alloy; Described T iron, comprising the shell of inside and outside and the middle plate and described the shielding action of annular, all is to be made with soft magnetic material, and described soft magnetic material comprises mild steel, pure iron, silicon steel, permalloy, non-crystaline amorphous metal.
The present invention also provides a kind of aforesaid additional product that can form the combined type coaxial loudspeaker that voice coil loudspeaker voice coil, vibrating diaphragm, support, flexible link and securing member are arranged that comprises.
The present invention has air-gap field height, simple in structure, low cost of manufacture, easily two permanent magnets is implemented to magnetize simultaneously, is convenient to the advantages such as operation in enormous quantities of automatic assembly line.
Description of drawings
Illustrate that below in conjunction with accompanying drawing the specific embodiment of the present invention is with further elaboration principle of the present invention.
Fig. 1 represent common external magnetic type structure loud speaker side cutaway view and overlook profile diagram;
Fig. 2 represents the side cutaway view of the loud speaker of common internal magnetization structure;
Fig. 3 represents side cutaway view that can form the combined type coaxial loudspeaker and the top plan view according to first embodiment of the invention;
Fig. 4 represents side cutaway view that can form the combined type coaxial loudspeaker and the top plan view according to second embodiment of the invention;
Fig. 5 represents side cutaway view that can form the combined type coaxial loudspeaker and the top plan view according to third embodiment of the invention;
Fig. 6 represents side cutaway view that can form the combined type coaxial loudspeaker and the top plan view according to fourth embodiment of the invention;
Fig. 7 represents side cutaway view that can form the combined type coaxial loudspeaker and the top plan view according to fifth embodiment of the invention;
Fig. 8 represents side cutaway view that can form the combined type coaxial loudspeaker and the top plan view according to sixth embodiment of the invention;
Fig. 9 represents side cutaway view that can form the combined type coaxial loudspeaker and the top plan view according to seventh embodiment of the invention;
Embodiment
Specify preferred embodiment below with reference to accompanying drawings according to combined type coaxial loudspeaker of the present invention.In the accompanying drawings, 1 expression T iron, the permanent magnet of 2 expression annulars, the external polar plate of 3 expression annulars, 4 expression bass magnetic field air gaps, the middle plate of 5 expression annulars, 6 expression height/middle pitch magnetic field air gaps, the cylindrical internal polar plate of 7 expressions, the columniform permanent magnet of 8 expressions, the columniform parallels of 9 expressions, the cup-shaped outer yoke of 10 expressions, the internal polar plate of 11 expression annulars, the hole that is provided with coaxially along axis direction on the axle post of 13 expression T iron, the little permanent magnet of 14 expression annulars, hole on the 15 expression T iron bottom plates, the hole of the axle post sidewall of 16 expression T iron, 17 expressions are made into split type T jack-post unshakable in one's determination with base plate, 18 expressions become split type T iron bottom plate with the axle column production, the cup-shaped shell that plays the effect of shielding stray field of 19 expression band ventilation holes, 20 expression securing members, 21 expression magnetic moment direction and the main permanent magnet of annular and the opposite annular auxiliary magnet of little permanent magnet of annular, 22 expressions are the support of vibrating diaphragm fixedly, the anchor clamps of 23 expression fixed supports and flexible link, 24 expression voice coil loudspeaker voice coils, 25 expression vibrating diaphragms, the main permanent magnet of 26 expression annulars, the T iron of 27 expression band ventilation holes.
Embodiment one
Fig. 3 represents according to the side cutaway view that can form the combined type coaxial loudspeaker of first embodiment of the invention and overlooks profile diagram.For convenience of explanation, in all embodiment of the present invention, represent the magnetic line of force path and the direction in magnetostatic loop of any one section of loud speaker with the dotted line of the closure of the arrow that superposeed.In addition, because comprise that the vibrational system of voice coil, vibrating diaphragm, support (as 22 in the accompanying drawing 1), geometrical clamp (as 23 among Fig. 1) etc. all is the conventional structure of knowing altogether in this professional domain, so in Fig. 3 and later embodiment, omitted the diagram and the specification specified of vibrational system.The worker of this area should be understood that this will help setting forth the present invention succinctly, legibly more, and can not produce any influence to the explanation of any essentiality content of the present invention.
Combined type coaxial loudspeaker according to present embodiment, be included on the base plate of T iron 27, the main permanent magnet 26 of the annular of She Zhiing coaxially, simultaneously, top at the main permanent magnet 26 of annular, the external polar plate 3 of an annular is set coaxially,, the middle plate 5 of an annular is set coaxially in the axle column top of T iron 27, inner chamber in the middle plate 5 of annular, the little permanent magnet 14 of an annular is set coaxially,, the internal polar plate 11 of an annular is set coaxially at the top of the little permanent magnet 14 of annular; Preferably: the magnetic moment direction of the main permanent magnet 26 of annular is identical with the magnetic moment direction of the little permanent magnet 14 of annular.Like this, the main permanent magnet 26 of annular forms a magnetostatic loop with the middle plate 5 of T iron 27, annular and the external polar plate 3 of annular, and constitutes air-gap field 4; Simultaneously, the little permanent magnet 14 of annular forms another magnetostatic loop with the middle plate 5 of T iron 27, annular and the internal polar plate 11 of annular, and constitutes air-gap field 6.Here, the width of the formed air-gap field 4 of difference of the internal diameter of the external polar plate 3 of annular and the external diameter of the middle plate 5 of annular is greater than the internal diameter of the middle plate 5 of annular and the width of the formed air-gap field 6 of difference of the external diameter of the internal polar plate 11 of annular.
Here point out emphatically, the worker of this area should be understood that, the width of described air-gap field 4 of using principle made of the present invention is bigger than the width of air-gap field 6, mean: look the actual demand of different application scenarios, when air-gap field 4 is used as bass, air-gap field 6 both can be used as middle pitch and had used, and can be used as high pitch again and used; When air-gap field 4 was used as middle pitch, 6 of air-gap fields were used as high pitch.Usually, just as mentioned before, the feature of Squawker then is between high pitch and the woofer, middle pitch sound wave section can be understood as the last extension of bass and the lower extension branch of high frequency audio, so, only need combination, can send the all-channel sound that can satisfy most of high-quality multimedia audio system demands with a woofer and a high pitch loudspeaker.Therefore, hereinafter reach in the later embodiment explanation, only mention bass air-gap field and high pitch air-gap field, this does not also mean that the combined type coaxial loudspeaker according to principle made of the present invention only is the combination of bass and high pitch.As mentioned above, according to the combined type coaxial loudspeaker of principle made of the present invention, and each embodiment that is set forth, both can be used as the combination of bass and high pitch, also can be used as the combination of bass and middle pitch, the perhaps combination of middle pitch and high pitch.
Can be clear that, when the magnetic moment direction of the magnetic moment direction of the main permanent magnet 26 of annular and the little permanent magnet 14 of annular is identical, if the magnetostatic loop that is produced by the main permanent magnet 26 of annular in the counterclockwise direction, then the magnetostatic loop that is produced by the little permanent magnet 14 of annular will be along clockwise direction; Otherwise if the magnetostatic loop that is produced by the main permanent magnet 26 of annular along clockwise direction, then the magnetostatic loop that is produced by the little permanent magnet 14 of annular will be in the counterclockwise direction.Like this, by the magnetostatic magnetic line of force that the main permanent magnet 26 of annular is produced, the magnetostatic magnetic line of force that will be produced with the little permanent magnet 14 by annular is assembled in the middle plate 5 of annular in the same way.Can produce mutual repulsive force between the two bundle magnetic lines of force of assembling in the same way, according to Maxwell equation, the magnetic line of force must be closed and walks shortest path, therefore, the mutual repulsive force that is produced between the two bundle magnetic lines of force of assembling in the same way, help to shorten simultaneously two bundle magnetic lines of force loop path separately, reduce magnetic resistance, thereby increase the magnetic field intensity in bass air gap 4 and the high pitch air gap 6 synergistically.So, under the measure-alike situation of magnet size and bass, high pitch air gap, the bass air-gap field intensity of combined type coaxial loudspeaker of the present invention and high pitch air-gap field intensity all are higher than the air-gap field intensity of split type woofer and high pitch loudspeaker respectively.Table 1 has been listed and has been used external diameter to be 89.0mm, internal diameter is 40.0mm, it highly is the ring-shaped sintered ferrite of Y30 for the trade mark of 15.0mm, with external diameter be 13.0mm, internal diameter is 3.0mm, it highly is the sintering neodymium-iron-boron permanent magnet of the annular of N35 for the trade mark of 2.0mm, the formation width is 1.675mm, it highly is the bass air-gap field of 4.0mm, with width be 0.625mm, when highly being the high pitch air-gap field of 2.0mm, traditional split type woofer of pressing Fig. 1 structure fabrication and the high pitch loudspeaker of press Fig. 2 structure fabrication and with the actual measurement correction data of the air-gap field intensity of the combined type coaxial loudspeaker of the structure as shown in Figure 3 of the present invention making.
Table 1
We can also see simultaneously, compare with the high pitch loudspeaker of Fig. 2 structure fabrication, and the magnetostatic loop feature of high pitch of the combined type coaxial loudspeaker of making of the present invention has been saved columniform parallels 9, and 10 two parts of cup-shaped outer yoke (seeing accompanying drawing 2).Therefore, combined type coaxial loudspeaker with the present invention's making, under the measure-alike situation of magnet size and bass, high pitch air gap, not only bass air-gap field intensity and high pitch air-gap field intensity, the air-gap field intensity that all is higher than split type woofer and high pitch loudspeaker respectively, and manufacturing cost also is lower than the two cost sum of split type woofer and high pitch loudspeaker.And, compare with two split type loud speakers, because the minimizing of total number of spare parts, assembly cost and production management cost have all reduced.
In addition, the magnetic moment direction of the main permanent magnet 26 of the annular of the combined type coaxial loudspeaker of making of the present invention is identical with the magnetic moment direction of annular little permanent magnet 14, just made things convenient for each part with this combined type coaxial loudspeaker after aggregate erection is finished, implement whole simple process operation of magnetizing so again, be convenient to the in enormous quantities operation of implementation of class like the such automatic assembly line of common split type loud speaker.If the magnetic moment direction of the main permanent magnet 26 of annular is identical anti-with the magnetic moment direction of the little permanent magnet 14 of annular, then not only can cause the magnetic field intensity in the high pitch air gap 6 to descend, and can't implement with each part after aggregate erection is finished whole again simple process operation of magnetizing such.
In the present embodiment,, run through the base plate of T iron 1 along the hole 13 that the central axial direction of the axle post of T iron 27 is provided with coaxially, and with the intracavity inter-connection of the internal polar plate 11 of the inner chamber of the little permanent magnet 14 of described annular and annular.Like this, the heat that voice coil loudspeaker voice coil produced that places high pitch air gap 6 to work just can be by hole 13 rows to the external world.Simultaneously, hole 13 can also play the effect that the voice coil loudspeaker voice coil that conveniently places high pitch air gap 6 is drawn lead.
In the present embodiment, the external diameter of the axle post of preferred T iron 27 is equal to or less than the external diameter of the middle plate 5 of annular.Fundamental characteristics according to the magnetic line of force, if the external diameter of the axle post of T iron 27 is greater than the external diameter of the middle plate 5 of annular, then not only can reduce the magnetic field intensity in the bass air gap 4, also can make the magnetic line of force distribution in the bass air gap 4 become inhomogeneous simultaneously, thereby cause the sounding quality of bass to reduce.Therefore, be provided with T iron 27 the axle post external diameter less than/equal the external diameter of middle plate 5 of annular, be of the present invention preferred.In addition, the height of the axle post of T iron 27 is less than the height sum of the two of height with the external polar plate 3 of annular of the main permanent magnet 26 of annular, make the height of the axle post of T iron 27, the height of little permanent magnet 14 of annular simultaneously, be greater than or equal to the height sum of the two of height and the external polar plate 3 of annular of the main permanent magnet 26 of annular with the height three sum of the internal polar plate 11 of annular, help improving the uniformity that the magnetic line of force in the bass air gap 4 distributes, thereby guarantee that combined type coaxial loudspeaker of the present invention has good bass quality.Similarly, the external diameter of the little permanent magnet 14 of preferred annular is equal to or less than the external diameter of the internal polar plate 11 of annular, can avoid magnetic field intensity and uniformity deterioration thereof in the high pitch air gap 6; And the height of the middle plate 5 of annular is equal to or less than the height sum of the two of height with the internal polar plate 11 of annular of annular little permanent magnet 14, help improving the uniformity that the magnetic line of force in the high pitch air gap 6 distributes, thereby guarantee that combined type coaxial loudspeaker of the present invention has good high pitch quality.
Embodiment two
Fig. 4 represents side cutaway view and the top plan view according to the formation combined type coaxial loudspeaker of second embodiment of the invention.Compare with first embodiment, be provided with a plurality of holes 15 that run through base plate on the base plate of the T iron 27 of the combined type coaxial loudspeaker of present embodiment, the position of these holes is between the internal diameter of main permanent magnet 26 of the external diameter of axle post of described T iron 27 and annular.Like this, just, the heat that voice coil loudspeaker voice coil produced that places bass air gap 4 to work can be arranged to the external world by hole 15.Other structure is identical with first embodiment.So, bass voice coil loudspeaker voice coil and the high pitch voice coil loudspeaker voice coil in this combined type coaxial loudspeaker all had good radiating condition.Identical with the principle of first embodiment, this combined type coaxial loudspeaker is under the measure-alike situation of magnet size and bass, high pitch air gap, not only bass air-gap field intensity and high pitch air-gap field intensity, the air-gap field intensity that all is higher than split type woofer and high pitch loudspeaker respectively, and manufacturing cost also is lower than the two cost sum of split type woofer and high pitch loudspeaker.Compare with two split type loud speakers, because the minimizing of number of spare parts, assembly cost and production management cost have all reduced.And this combined type coaxial loudspeaker can be implemented whole such simple process that magnetizes again after its each part aggregate erection is finished, be convenient to the in enormous quantities operation of implementation of class like the such automatic assembly line of common split type loud speaker.
Because the principle of present embodiment and embodiment one is identical, constitute also similar substantially, so omitted detailed description thereof.
Embodiment three
Fig. 5 represents side cutaway view and the top plan view according to the formation combined type coaxial loudspeaker of third embodiment of the invention.Compare with first embodiment, be provided with the hole 16 that the hole 13 that is provided with coaxially along axis direction on the axle post of a plurality of and T iron is connected on the sidewall of the axle post of the T iron 27 of the combined type coaxial loudspeaker of present embodiment, like this, just, can will arrange to the external world by the hole 13 that is communicated with it by the heat that voice coil loudspeaker voice coil produced that places bass air gap 4 to work.Other structure is identical with first embodiment.Like this, bass voice coil loudspeaker voice coil and the high pitch voice coil loudspeaker voice coil in this combined type coaxial loudspeaker all had good radiating condition.Identical with the principle of first embodiment, this combined type coaxial loudspeaker is under the measure-alike situation of magnet size and bass, high pitch air gap, not only bass air-gap field intensity and high pitch air-gap field intensity, the air-gap field intensity that all is higher than split type woofer and high pitch loudspeaker respectively, and manufacturing cost also is lower than the two cost sum of split type woofer and high pitch loudspeaker.Compare with two split type loud speakers, because the minimizing of number of spare parts, assembly cost and production management cost have all reduced.And this combined type coaxial loudspeaker can be implemented whole such simple process that magnetizes again after its each part aggregate erection is finished, be convenient to the in enormous quantities operation of implementation of class like the such automatic assembly line of common split type loud speaker.
The worker of this area should be understood that, the hole 16 that the hole 13 that is provided with coaxially along axis direction on the axle post of a plurality of and T iron that is provided with on the sidewall of the axle post of the T iron 27 described in the embodiment of the application principle of the invention is connected, both can be perpendicular to the hole of the axle mast axis direction of T iron 27, also can be the inclination hole angled with the axle mast axis direction of T iron 27.
Because the principle of present embodiment and embodiment one is identical, constitute also similar substantially, so omitted detailed description thereof.
Embodiment four
Fig. 6 represents side cutaway view and the top plan view according to the formation combined type coaxial loudspeaker of fourth embodiment of the invention.Can be clear that the combined type coaxial loudspeaker of present embodiment is actually the combination of the first embodiment of the present invention, second embodiment and the 3rd embodiment technology.Specifically, the existing a plurality of holes 15 that on the base plate of T iron 27, are provided with of present embodiment, the hole 16 that has the hole 13 that is provided with coaxially along axis direction on the axle post of a plurality of and T iron that is provided with on the sidewall of the axle post of T iron 27 to be connected again.Therefore, the bass voice coil loudspeaker voice coil of the combined type coaxial loudspeaker of present embodiment and high pitch voice coil loudspeaker voice coil all have good radiating condition.
Because the principle of present embodiment and embodiment one is identical, constitute also similar substantially, so omitted detailed description thereof.
Embodiment five
Fig. 7 represents side cutaway view and the top plan view according to the formation combined type coaxial loudspeaker of fifth embodiment of the invention.Compare with the second embodiment of the present invention, the axle post 17 of the T iron of the combined type coaxial loudspeaker of present embodiment is two parts of split with the base plate 18 of T iron, connects by gluing or mechanical fixation method, and other structure is identical with second embodiment.
Because the principle of present embodiment and embodiment one is identical, constitute also similar substantially, so omitted detailed description thereof.
Embodiment six
Fig. 8 represents side cutaway view and the top plan view according to the formation combined type coaxial loudspeaker of sixth embodiment of the invention.Can see, the combined type coaxial loudspeaker of present embodiment, be actually and on the basis of embodiments of the invention two, increased the cup-shaped shell of making of soft magnetic material 19 that plays the effect of shielding stray field, and, cup-shaped shell 19 is provided with the hole 15 on the base plate with T iron 27, and the corresponding perforations that is connected of the hole 13 of the axle post of T iron 27.Be connected by fastener 20 between the external polar plate 3 of the main magnet 26 of cup-shaped shell 19 and T iron 27, annular and annular, perhaps pass through known in the industry gluingly be connected with other mechanical fixation methods, other structure is identical with first embodiment.
Because the principle of present embodiment and embodiment one is identical, constitute also similar substantially, so omitted detailed description thereof.
Embodiment seven
Fig. 9 represents side cutaway view and the top plan view according to the formation combined type coaxial loudspeaker of seventh embodiment of the invention.The combined type coaxial loudspeaker of present embodiment is actually combining of the sixth embodiment of the present invention and routine techniques, more particularly, be between the base plate and cup-shaped shell 19 of the T of sixth embodiment of the present invention iron 27, increased the auxiliary magnet 21 of the opposite annular of the main magnet 26 of a magnetic moment direction and annular.Its effect is the leakage field that further reduces the main magnet 26 of annular, and increases the magnetic field intensity in the bass air gap 4.But press the combined type coaxial loudspeaker that present embodiment is made, cost is than the height of the 6th embodiment, and after can't being implemented in each part aggregate erection and finishing, and implements integral body such simple process that magnetizes again.The structure of the combined type coaxial loudspeaker of present embodiment is mainly used in the particular application that the leakage field index of loud speaker is had strict demand.
Because the principle and the first embodiment of the present invention of present embodiment are identical, constitute also similar substantially, so omitted detailed description thereof.
The worker of this area should be understood that, in each embodiment explained above, for different loudspeaker applications occasions, between each part of combined type coaxial loudspeaker, and between combined type coaxial loudspeaker and its vibrational system that is complementary, be to connect by the gluing of various routines or mechanical fixation method.In addition, in each embodiment explained above, making the main permanent magnet of described annular, the little permanent magnet of annular and the auxiliary magnet material of annular is the sintered body or the cohesive body of neodymium-iron-boron, samarium-cobalt, ferrite, alnico alloy; And described T iron, comprise the shell of inside and outside and the middle plate and described the shielding action of annular, and all be to be made with soft magnetic material, described soft magnetic material comprises mild steel, pure iron, silicon steel, permalloy, non-crystaline amorphous metal.
Describe various concrete structures in detail above according to formation combined type coaxial loudspeaker of the present invention with reference to accompanying drawing, those skilled in the art can be widely used in various fields with combined type coaxial loudspeaker according to the present invention thus, for example be applied in the various electroacoustic equipments, comprise the sounding parts of various multimedia audio systems, computer, DVD, TV, phone, mobile phone, automobile and various industry and civilian instrument, equipment etc.
Describe a plurality of embodiment of the present invention in detail above, but top embodiment only is to of the present invention schematically illustrating and unrestricted the present invention with reference to accompanying drawing.In addition, though above be with separately, the form of separating describes each embodiment, those skilled in the art are to be appreciated that above-mentioned a plurality of embodiment also can use in combination.And those skilled in the art can make various modifications and variations to the present invention in conjunction with the technology of existing conventional loud speaker after having read above-mentioned explanation, this modifications and variations also drop within protection scope of the present invention.
Claims (10)
1. a combined type coaxial loudspeaker comprises: on the base plate of a T iron, the main permanent magnet of an annular is set coaxially; At the top of the main permanent magnet of described annular, the external polar plate of an annular is set coaxially; In the axle column top of described T iron, the middle plate of an annular is set coaxially; At the inner chamber of the middle plate of described annular, the little permanent magnet of an annular is set coaxially; At the top of the little permanent magnet of described annular, the internal polar plate of an annular is set coaxially; Center at the axle post of described T iron is provided with a hole coaxially along axis direction, and this hole runs through the base plate of described T iron, and with the intracavity inter-connection of the internal polar plate of the inner chamber of the little permanent magnet of described annular, annular; Wherein, the external diameter of the axle post of described T iron less than/equal the external diameter of the middle plate of described annular, the height of the axle post of described T iron is less than the height sum of the two of the external polar plate of the height of the main permanent magnet of described annular and described annular, make simultaneously the height of the axle post of described T iron, described annular little permanent magnet height and the internal polar plate of annular height three sum greater than/equal the height sum of the two of the external polar plate of the height of main permanent magnet of described annular and described annular.
2. combined type coaxial loudspeaker according to claim 1, wherein: the magnetic moment direction of the main permanent magnet of described annular is identical with the magnetic moment direction of the little permanent magnet of described annular.
3. combined type coaxial loudspeaker according to claim 1 and 2, wherein: the height of the middle plate of described annular less than/equal the height sum of the two of the internal polar plate of the height of little permanent magnet of described annular and described annular; And, the external diameter of the little permanent magnet of described annular less than/equal the external diameter of the internal polar plate of described annular.
4. combined type coaxial loudspeaker according to claim 1 and 2, wherein: on the base plate of described T iron, one or more holes that run through the base plate of described T iron are set, and make the position of these holes be between the internal diameter of main permanent magnet of the external diameter of axle post of described T iron and described annular.
5. combined type coaxial loudspeaker according to claim 1 and 2, wherein: the side at the axle post of described T iron, one or more holes are set, make that the hole that is provided with coaxially along axis direction on the axle post of these holes and described T iron is connected.
6. combined type coaxial loudspeaker according to claim 1 and 2, wherein: the axle post of described T iron and the base plate of described T iron are two parts of split, connect by gluing or mechanical fixation method.
7. combined type coaxial loudspeaker according to claim 1 and 2, wherein:, the cup-shaped shell of being made by soft magnetic material is installed at the plate outer side of described T iron; Perhaps, plate outer side at described T iron, the auxiliary permanent magnet of an annular opposite with the magnetic moment direction of the main permanent magnet of described annular is set coaxially, in the periphery of described T iron with the auxiliary permanent magnet of annular, the cup-shaped shell of being made by soft magnetic material is installed, plays the shielding external leakage field of permanent magnet and increase the bass air-gap field.
8. combined type coaxial loudspeaker according to claim 1 and 2, wherein: the main permanent magnet of described annular, annular assist the little permanent magnet of permanent magnetism, annular, the axle post of T iron, the base plate of T iron, the middle plate of annular, the internal polar plate of annular, the external polar plate and described the plaing between the cup-shaped shell that shields the leakage field effect of annular to connect by gluing or mechanical fixation method.
9. combined type coaxial loudspeaker according to claim 1 and 2, wherein: making the main permanent magnet of described annular, the little permanent magnet of annular and the material of the auxiliary permanent magnet of annular is the sintered body or the cohesive body of neodymium-iron-boron, samarium-cobalt, ferrite, alnico alloy; Described T iron, the inside and outside and middle plate that comprises annular and the described shell that plays the effect of shielding leakage field all are to be made with soft magnetic material, and described soft magnetic material comprises mild steel, pure iron, silicon steel, permalloy, non-crystaline amorphous metal.
10. device that comprises the described combined type coaxial loudspeaker of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101771532A CN102036150A (en) | 2009-09-28 | 2009-09-28 | Combined type coaxial loudspeaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101771532A CN102036150A (en) | 2009-09-28 | 2009-09-28 | Combined type coaxial loudspeaker |
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| CN102036150A true CN102036150A (en) | 2011-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101771532A Pending CN102036150A (en) | 2009-09-28 | 2009-09-28 | Combined type coaxial loudspeaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281655A (en) * | 2013-04-16 | 2013-09-04 | 沙文金 | Double-voice coil moving-coil loudspeaker |
| CN105592386A (en) * | 2016-03-11 | 2016-05-18 | 嘉兴万声电子科技有限公司 | Ultrahigh-power loudspeaker |
| CN105848064A (en) * | 2016-05-10 | 2016-08-10 | 青岛歌尔声学科技有限公司 | Dual-magnetic-gap magnetic path system and loudspeaker with same |
| US20220345824A1 (en) * | 2019-09-30 | 2022-10-27 | Goertek Inc. | Sound-producing apparatus, acoustic module provided with sound-producing apparatus, and electronic device |
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| CN2448042Y (en) * | 2000-10-11 | 2001-09-12 | 李阿玉 | Mid-high voice frequency coaxial loudspeaker |
| US6639995B2 (en) * | 2002-01-23 | 2003-10-28 | Advanced Magnetic Technologies, Inc. | Concentric magnetic configuration for loudspeakers |
| CN101521842A (en) * | 2008-02-29 | 2009-09-02 | 唐华西 | Speaker magnetic loop structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2448042Y (en) * | 2000-10-11 | 2001-09-12 | 李阿玉 | Mid-high voice frequency coaxial loudspeaker |
| US6639995B2 (en) * | 2002-01-23 | 2003-10-28 | Advanced Magnetic Technologies, Inc. | Concentric magnetic configuration for loudspeakers |
| CN101521842A (en) * | 2008-02-29 | 2009-09-02 | 唐华西 | Speaker magnetic loop structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281655A (en) * | 2013-04-16 | 2013-09-04 | 沙文金 | Double-voice coil moving-coil loudspeaker |
| CN105592386A (en) * | 2016-03-11 | 2016-05-18 | 嘉兴万声电子科技有限公司 | Ultrahigh-power loudspeaker |
| CN105848064A (en) * | 2016-05-10 | 2016-08-10 | 青岛歌尔声学科技有限公司 | Dual-magnetic-gap magnetic path system and loudspeaker with same |
| CN105848064B (en) * | 2016-05-10 | 2019-06-04 | 青岛歌尔声学科技有限公司 | Double magnetic gap magnetic circuit systems and loudspeaker with double magnetic gap magnetic circuit systems |
| US20220345824A1 (en) * | 2019-09-30 | 2022-10-27 | Goertek Inc. | Sound-producing apparatus, acoustic module provided with sound-producing apparatus, and electronic device |
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Application publication date: 20110427 |