CN201897961U - Reflecting paraboloid sound guiding device - Google Patents
Reflecting paraboloid sound guiding device Download PDFInfo
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- CN201897961U CN201897961U CN2010206421247U CN201020642124U CN201897961U CN 201897961 U CN201897961 U CN 201897961U CN 2010206421247 U CN2010206421247 U CN 2010206421247U CN 201020642124 U CN201020642124 U CN 201020642124U CN 201897961 U CN201897961 U CN 201897961U
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- paraboloid
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Abstract
The utility model relates to a reflecting paraboloid sound guiding device. The sound guiding device comprises an inner tube, a reflecting tube and a paraboloid sound guiding tube, wherein the paraboloid sound guiding tube integrally adopting a basin-shaped structure has an annular planar top and a paraboloid wall; the inner tube and the reflecting tube are mutually connected in a folding manner to form a horn component, and the downward orifice at the thin end of the inner tube is connected with a sound head; the orifice of the paraboloid sound guiding tube takes the shape that four straight lines and four sections of arcs are connected at intervals; and the wall of the paraboloid sound guiding tube locally takes the shape of a lateral tangent plane. The reflecting paraboloid sound guiding device has the advantages of strong directivity, small size, light weight and convenience in carrying, transportation and installation, is more suitable for being manufactured into a combined-type loudspeaker once designed into a square, and can be combined into various linear sound sources or planar sound sources with different sizes. The linear sound sources or planar sound sources combined by the loudspeaker endow the sound guiding device with more poignant guiding characteristic, higher output acoustical power and longer broadcast transmission.
Description
Technical field
The utility model relates to the electroacoustic techniques field, particularly a kind of highly directive reflection-type paraboloid sound guiding device that can improve horn loudspeaker sound (0 °) direction sound radiation pressure level.
Background technology
At present, at home and abroad in the horn loudspeaker of production and selling, or at home and abroad in the teaching material or the publications on science and technology that can see of some institutions of higher education, the professional has designed various difform horns for the horn speaker of different purposes, and the length of its horn also has nothing in common with each other.But these difform horns, a common ground is arranged: the aditus laryngis that all is horn is little, and opening is big.All be to begin to calculate according to the sectional area from aditus laryngis, along with the increase of leaving the aditus laryngis distance, the cross-sectional area of horn constantly increases, when calculating the horn mouth, and the cross-sectional area maximum.Why different the shape of these horns is, all are because various horns are when the distance of leaving aditus laryngis constantly increases, the speed difference that the cross-sectional area of horn increases.
According to the different classification of the curve of horn: taper, index are linear, hyperbola and parabola shaped horn; The different classification of length according to horn: also can be divided into collapsible and direct-injection type.
In the arenas or the hall, sometimes in order to widen the directive property of loudspeaker, also make the multi-format horn or some fence are installed in the horn mouth, pointing capability is broadened.The purpose of doing these work all is in order to widen the directive property of loudspeaker.Make in the arenas or the hall, be sitting in the audience at edge, also can be the same with the audience in the middle of being sitting in, hear the sound programme that frequency distortion is less, improve hearing effect.
And study the energy accumulating of sound in a little scope, propagate into the research and the experimental work of the highly directive loudspeaker at far place, that also carries out is less.Although current have many R﹠D institutions and universities and colleges all studying for remote high power broadcast, mostly at the input electric power that increases the sound head with improve direct-injection type horn shape time up and down.
All horn loudspeakers all are the area of the area of horn mouth greater than aditus laryngis at present, and if not sound just can not be propagated in horn.The size of horn extension index and the size of horn open area have determined the lower frequency limit (being the cutoff frequency of horn) and the frequency response of horn transmission sound.
Sound is propagated from horn, and because of the cross-sectional area of its horn is enlarging gradually, sound wave is just broadcast to the horn oral instructions according to the diffusion angle of horn shape.Sound wave is inner at horn to be not a plane wave just, when passing to the horn outside, has just almost become a spherical wave.So, designing the horn shape of horn loudspeaker come what may, the directional property of the sound wave that it radiate does not have much improvement.
Make loudspeaker have sharp-pointed directive property, must make the sound wave of loudspeaker radiation become plane wave as far as possible.At least be plane wave at " horn " mouthful sound wave of propagating with interior part.And this prior art was short of just, therefore, the axial directional property of sound radiation has very big room for improvement.
Summary of the invention
The purpose of this utility model is exactly for overcoming the deficiencies in the prior art, at the difficult problem of sound radiation axial directional property of acoustic conductance, provide the sharpened and acoustic conductance that improves (0 °) sound pressure level on the horn loudspeaker sound radiation direction of a kind of directional property that can make horn loudspeaker to device to device.
The utility model is to realize by such technical scheme: reflection-type paraboloid sound guiding device, comprise paraboloid sound guiding pipe, reflection tube and interior pipe, it is characterized in that paraboloid sound guiding pipe top is that circular flat, tube wall are parabolic shape, integral body is bathtub construction; Interior pipe and reflection tube are interconnected to the horn assembly by collapsible horn structure, and interior pipe thinner end connects loudspeaker sound head to the lower nozzle place; The circular flat center on described paraboloid sound guiding pipe top has a hole; The horn assembly of interior pipe and reflection tube formation is fixedly installed in the circular flat center drilling place on paraboloid sound guiding pipe top, the loudspeaker sound head that is connected with interior pipe is installed on the outside of the circular flat center drilling on paraboloid sound guiding pipe top, the axis of loudspeaker sound head and paraboloidal central axes.
The paraboloid sound guiding tube opening is a square structure, and the paraboloid sound guiding pipe mouth of pipe is that four straight lines are connected shape at interval with four sections arcs; The tube wall local shape of paraboloid sound guiding pipe is the side tangent plane.
Four segmental arc parts of the paraboloid sound guiding pipe mouth of pipe radially level stretch out, and form four mouth of pipe arms of angle.
The utility model has the advantages that: 1. the directive property of the utility model device strong (0 ° of direction of polar plot is sharp-pointed): under the condition of using same sound head, use device sound reproduction of the present utility model, can be than the horn sound reproduction of using general horn loudspeaker, more than the high 3dB of overall sound pressure level on 0 ° of direction.That is to say, using under the condition of same sound head, with device sound reproduction of the present utility model, when audition at a distance, the loudness effect in the time of reaching two general horn loudspeakers and raise one's voice to its utmost simultaneously.Device of the present utility model is specially adapted to remote, the broadcasting of directional property by force.Be equivalent to 0
0On the direction electro-acoustic conversion efficiency of sound head is doubled.2. the volume of the utility model device is little, in light weight.The utility model device with the collapsible horn speaker of bore relatively, it is short to have " horn " length, lightweight advantage.Compare with the direct-injection type horn speaker, acoustic conductance of the present utility model only is equivalent to below 1/3 of direct-injection type horn speaker length to the length of device.Advantage is more obvious.Therefore, the small product size of the utility model device is little, in light weight, is easy to carry, transports and install.3. if device configuration design quadrate of the present utility model, be more suitable in making combination speaker.As with 4,6,9 or 16 foursquare the utility model device products, be installed in the same plane, just can form various forms of " line source " or " area source of sound " that differ in size." line source " or " area source of sound " that set of speakers is synthetic can make its directional property become more sharp-pointed, and the acoustical power of output is bigger, and the distance of broadcast transmitted is farther.
Description of drawings
Fig. 1, reflection-type paraboloid sound guiding device exploded view A;
Fig. 2, reflection-type paraboloid sound guiding device exploded view B;
The combination speaker figure that Fig. 3, reflection-type paraboloid sound guiding device constitute.
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing:
As shown in Figure 1 to Figure 3, reflection-type paraboloid sound guiding device is the focus characteristics that has utilized parabolic focus, the horn mouth of horn loudspeaker is placed on the paraboloidal focus, and sound becomes cluster and is parallel to the sound of parabolic central shaft to parabolic external radiation after parabolic reflector.Can be similar to the formation plane sound wave in parabolic radiation exit.After acoustic irradiation is gone out, can on the acoustic radiating direction, play the effect of assembling acoustic energy, make the directional property of this device sharpened.
The reflection-type paraboloid sound guiding device principle of compositionality, equation Y
2=2px is the para-curve through the rectangular coordinate system true origin.This para-curve is about the curve of x axle for symmetry.If is this para-curve turning axle with the x axle, rotate a circle, just can draw a parabola.Paraboloidal summit is exactly a true origin.Parabolic focus also is paraboloidal focus, and focus is on the x axle, and the distance of focus and true origin is p/2.
Parabola has such character: light or electromagnetic wave from paraboloidal focus is sent, to all directions radiation, be radiated parabolic light and electromagnetic wave after reflection, and can all advance along the direction parallel with the x axle, form parallel light or the electromagnetic wave of cluster.Otherwise light that cluster is parallel or electromagnetic wave incide on the parabola along the x axle, after reflection, can all focus on the paraboloidal focus.
Experimental results show that, reflection-type paraboloid sound guiding device compares with the collapsible horn speaker of identical bore, equal length, uses same sound head as driver element, on the x direction of principal axis, under the situation of same test distance, the former sound pressure level is than more than the high at least 3dB of the latter.This is equivalent to two horn loudspeakers (latter) sound pressure level that sounding obtained simultaneously, the sound pressure level of the sound that last " reflection-type paraboloid sound guiding device " that could push up sends.That is to say, on the direction of x axle, use same sound head, is the horn difference, and the former doubles than the latter's sound conversion efficiency.
Realize that the utility model need carry out following design process:
1, design and make a suitable parabola: in rectangular coordinate system, y
2It is symmetry about the x axle that=2px is one, and through the para-curve of true origin, the parabolic focus coordinate is (p/2,0).With the x axle is turning axle, and this para-curve is rotated a circle around the x axle, just obtains a parabola.This paraboloidal central shaft (turning axle) is exactly the x axle.Paraboloidal focus on the x axle, with the distance of parabolic summit (true origin) also be p/2.
In device of the present utility model, the sound head is assembled to paraboloidal top, and the interior pipe 3 of its horn and the axis of reflection tube 2 overlap with the x axle just in time by paraboloidal focus, has influenced parabolic focusing to sound.In order to solve focus issues, need parabola is outwards moved, its paraboloidal focus is also corresponding outwards to be moved.
Perpendicular to the x axle and by in the plane of true origin, be the center with the true origin, be radius with a certain numerical value r, make a circle.Separating from the summit about the axisymmetric parabolical two parts of x, distinguish outside parallel displacement r, it is the center of circle that two sections parabolical summits after the translation are dropped on respectively with the true origin, is on the circumference of radius with r.Around the rotation of x axle, becoming a bottom has " circle is flat ", paraboloidal bathtub construction is arranged on every side the para-curve after the translation, and Here it is, and we are needed.
During design, make the length of radius r just in time equal the radius of reflection tube 2 opening parts in the utility model device and interior pipe 3 in 1/2nd of the radius sum in same horizontal level cross section.The radius of r=(reflection tube opening part+with the interior caliber of reflection tube opening same horizontal plane to section radius) ÷ 2
2, design and make the horn component system of a horn loudspeaker: horn assembly, reflection tube 2 that comprises that an energy is connected with loudspeaker sound head and interior pipe 3; And interior pipe 3 and reflection tube 2 are interfixed and install according to certain mode and spacing.
3, the horn system of the above-mentioned horn loudspeaker of making is installed in the parabola, is " reflection-type paraboloid sound guiding device " described in the utility model.
4, test:, successively it is installed on device neutralization of the present utility model and is installed in the general horn loudspeaker that bore is identical, length is similar with same sound head.Under identical test condition, measure respectively.The measurement project comprises: sound pressure frequency response curve, sound radiation axis (x axle) are gone up the overall sound pressure level at predetermined distance place, and measure both directional properties, then the contrast test data.
Further set forth the utility model process below in conjunction with embodiment:
Make paraboloid sound guiding pipe 1 parabola.Making a bore is ф 410mm, and length (thickness) is the reflection-type paraboloid sound guiding device of 180mm.
At first set up parabolical equation: y
2=2px establishes p=90, and then equation is: y
2=180x, parabolic focus is (45,0).
Perpendicular to the x axle and by in the plane of true origin, be the center of circle with the true origin, with r=40mm radius, make a circle.This circle is exactly " at the bottom of the basin " of the paraboloid sound guiding pipe 1 of bathtub construction, it is the circular flat 11 on paraboloid sound guiding pipe top, " tub wall " of bathtub construction, promptly to be exactly with the x axle be turning axle to the tube wall of paraboloid sound guiding pipe 1, after moving in addition, its equation is: (2px)
1/2+ 40=(180x)
1/2+ 40 para-curve is the parabola that radius spins out; The span of x is 0-180mm in the formula.Paraboloid sound guiding pipe 1 opening can be made as square structure, method is to be an xsect length of side that the central shaft of foursquare cavity square body of 2R and the central shaft of the parabolic device of the utility model coincide, cavity square body lower port square-shaped planar is that the paraboloid sound guiding tube opening overlaps with the plane that is positioned at x=H (this plane is vertical with the x axle), the cavity square body moves suitable distance vertically downward along the x axle, cut away part garden arc, the reflection-type paraboloid sound guiding device that cuts out, paraboloid sound guiding pipe 1 radius are that the circular arc portion in cross section of R is just in time tangent with the limit of square-shaped planar.
If the foursquare length of side of cavity square body lower port is 410mm, parabolic full circle part (not being cut part) maximum gauge also is 410mm, and maximum radius is 205mm.Half of square-shaped planar diagonal angle line length is 290mm.Parabolic with respectively surrender an arc perpendicular to the x axle and by the square-shaped planar that x=180mm is ordered mutually in four angular positions of paraboloid sound guiding pipe (1).The vertical range of four arcs and x axle all equals: (180*180)
1/2+ 40=180+40=220mm; Four arcs are 290-220=70mm. to the distance of four drift angles of square-shaped planar.After square-shaped planar moved down cutting, the tube wall local shape of the paraboloid sound guiding pipe 1 at square-shaped planar four sidelines and paraboloid sound guiding pipe 1 tangent position was the plane, formed paraboloid sound guiding pipe side tangent plane 12; The shape of the corresponding paraboloid sound guiding pipe 1 tube wall part in the not tangent position of square-shaped planar four sidelines and paraboloid sound guiding pipe 1 still is parabolic; Paraboloid sound guiding pipe 1 from position (four arcs) that the mouth of pipe is not cut radially level stretch out, extend to four drift angles of square-shaped planar and overlap the position, form four mouth of pipe arms of angle 13; The total length that interior pipe 3 and reflection tube 2 are assembled up can not be higher than parabolic inner total depth 180mm, notices that again the opening part height and position of reflection tube 2 must be consistent with paraboloidal focus height and position.The length of pipe 3 is 132.5mm in determining as calculated, and the length of reflection tube 2 is 95mm.The interior pipe 3 of reflection-type paraboloid sound guiding device and the cross-sectional area of reflection tube 2 are pressed the exponential line horn and are calculated: determine that as calculated it is suitable that the extension index of interior pipe 3 and reflection tube 2 is m=0.1508 (cm of unit).
Make the taper reflection round platform 4 of anti-standing wave.In order to prevent to produce standing wave between sound wave that reflection tube 2 sends and parabolic bottom surface (circular flat on paraboloid sound guiding pipe top), installed a taper additional on the base plane of special root at interior pipe 3 and reflected sloping platform 4 with base plane angle at 45.。
Test the utility model: with same sound head, successively be installed on the reflection-type paraboloid sound guiding device that bore is ф 410mm and bore is on the horn of general horn loudspeaker of ф 400mm, use the Polse test macro instrument of Denmark B﹠K company, in anechoic room, test respectively, the overall sound pressure level and the directive property test result of (0 °) on its pressure frequency response, the central axis direction compared.
The 10 watts of power of sound head of feeding, measuring distance is 10 meters, test signal is the frequency response curve of the central axial direction of pink noise.Both comparison shows that its A weighted overall sound pressure level test result, use the utility model acoustic conductance is used the high 3.79dB of overall sound pressure level from general horn loudspeaker horn to the overall sound pressure level ratio of device.The overall sound pressure level of its Lin shelves, the former also exceeds 3.35dB than the latter.
And when remote audition, the test result of A weighted more approaches the sensation of people's ear.The frequency response curve of analysis pink noise as can be seen, medium-high frequency section more than 315Hz, the utility model acoustic conductance is all higher to the sound pressure level of device, and the frequency range of this broad people's ear frequency range the most responsive just to sound, so, during remote audition, with same sound head, use the utility model acoustic conductance when device, the people can feel that broadcast program is clearer louder.
Reflection-type paraboloid sound guiding device can accumulate in the acoustic energy of loudspeaker radiation on axis (0 °) direction of loudspeaker effectively, makes the directional property of loudspeaker become sharp-pointed.Thereby the sound pressure level on the horn loudspeaker axis direction is effectively improved, generally can improve more than the 3dB.Can be sound transmission farther.
Can be under the situation that does not increase loudspeaker (input electric power), the sound pressure level (laser propagation effect) in the time of on test (or audition) point, obtaining being equivalent to double loudspeaker and raise one's voice to its utmost.
Be designed to foursquare acoustic conductance to device, be more convenient for being combined into " point sound source " or " area source of sound ".Like this, both can improve output acoustic power, and can further make its directional property become more sharp-pointed again, on central axial direction, more effectively assemble the energy of sound.So the combination of reflection-type paraboloid sound guiding device is more suitable for remote, high power broadcast.
The sound head of loudspeaker is installed on the outside at center, parabolic top.The axis of sound head and paraboloidal central axes.
The axis of horn and parabolic central axes.The thin end opening of reflection tube is facing to the center on parabolic top.
In order to form loudspeaker battle array (being combination loudspeaker), need the acoustic conductance of circle is made foursquare structure to device.Like this, can the synthetic various forms of loudspeaker battle arrays of random set.Can be " line source " or " area source of sound ".Can have stronger directive property, higher sound pressure level, farther sound transmission.
The intention of square structure comprises the condition that to the method for paraboloidal cutting mode, aggregate erection, has all satisfied aggregate erection, and combination loudspeaker forms line source or area source of sound, has stronger directive property.High-power remote broadcasting more needs combination loudspeaker.The utility model is convenient to aggregate erection, and the space when having utilized aggregate erection better between each loudspeaker unit enlarges paraboloidal reflective surface area, raising sound cumulative effect.
Claims (3)
1. reflection-type paraboloid sound guiding device comprises paraboloid sound guiding pipe (1), reflection tube (2) and interior pipe (3), it is characterized in that, paraboloid sound guiding pipe (1) top is that circular flat (11), tube wall are parabolic shape, and integral body is bathtub construction; Interior pipe (3) and reflection tube (2) are interconnected to the horn assembly by collapsible horn structure, and interior pipe (3) thinner end connects loudspeaker sound head to the lower nozzle place; Circular flat (11) center on described paraboloid sound guiding pipe (1) top has a hole; The horn assembly of interior pipe (3) and reflection tube (2) formation is fixedly installed in circular flat (11) the center drilling place on paraboloid sound guiding pipe (1) top, the loudspeaker sound head that is connected with interior pipe (3) is installed on the outside of circular flat (11) center drilling on paraboloid sound guiding pipe (1) top, the axis of loudspeaker sound head and paraboloidal central axes.
2. reflection-type paraboloid sound guiding device according to claim 1 is characterized in that paraboloid sound guiding pipe (1) opening is a square structure, and paraboloid sound guiding pipe (1) mouth of pipe is that four straight lines are connected shape at interval with four sections arcs; The tube wall local shape of paraboloid sound guiding pipe (1) is side tangent plane (12).
3. reflection-type paraboloid sound guiding device as claimed in claim 1 or 2 is characterized in that, four segmental arcs parts of paraboloid sound guiding pipe (1) mouth of pipe radially level stretch out, and form four mouth of pipe arms of angle (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206421247U CN201897961U (en) | 2010-12-06 | 2010-12-06 | Reflecting paraboloid sound guiding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206421247U CN201897961U (en) | 2010-12-06 | 2010-12-06 | Reflecting paraboloid sound guiding device |
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| Publication Number | Publication Date |
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| CN201897961U true CN201897961U (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206421247U Expired - Fee Related CN201897961U (en) | 2010-12-06 | 2010-12-06 | Reflecting paraboloid sound guiding device |
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| CN (1) | CN201897961U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107343243A (en) * | 2017-08-24 | 2017-11-10 | 出门问问信息科技有限公司 | One kind reflection cone and audio amplifier |
| CN108600908A (en) * | 2018-06-13 | 2018-09-28 | 清华大学 | Reflection-type air acoustic horn |
-
2010
- 2010-12-06 CN CN2010206421247U patent/CN201897961U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107343243A (en) * | 2017-08-24 | 2017-11-10 | 出门问问信息科技有限公司 | One kind reflection cone and audio amplifier |
| CN108600908A (en) * | 2018-06-13 | 2018-09-28 | 清华大学 | Reflection-type air acoustic horn |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110713 Termination date: 20141206 |
|
| EXPY | Termination of patent right or utility model |