CN107438212A - Bass reflex mouth and PA-system - Google Patents
Bass reflex mouth and PA-system Download PDFInfo
- Publication number
- CN107438212A CN107438212A CN201710379202.5A CN201710379202A CN107438212A CN 107438212 A CN107438212 A CN 107438212A CN 201710379202 A CN201710379202 A CN 201710379202A CN 107438212 A CN107438212 A CN 107438212A
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- Prior art keywords
- bass reflex
- mouth
- reflex mouth
- rigidity
- wall
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- 230000011514 reflex Effects 0.000 title claims abstract description 230
- 239000000463 material Substances 0.000 claims description 30
- 238000005520 cutting process Methods 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 description 21
- 239000002775 capsule Substances 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 230000000739 chaotic effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Bass reflex mouth includes tubular element.The rigidity of a part of wall of tubular element is less than the rigidity of the remainder of tubular element.The rigidity of the wall of at least one end of tubular element is less than the rigidity of the wall of the middle body of tubular element in the axial direction on the axial direction of tubular element.
Description
Technical field
The present invention relates to PA-system as bass reflex mouth and such as bass reflex loudspeaker.
Background technology
Bass reflex loudspeaker has been proposed, it is by using the housing from loudspeaker unit to bass reflex loudspeaker
The sound that rear side is sent strengthens the volume of bass high sound.In bass reflex loudspeaker, set the interior of housing (capsule)
Portion and the outside bass reflex mouth to communicate with each other.In bass reflex loudspeaker, abnormal sound is caused (to make an uproar from bass reflex mouth
Sound).Accordingly, it has been suggested that various technologies are to reduce from abnormal sound caused by bass reflex mouth.
JP-UM-A-56-63182 discloses a kind of speaker system, wherein sound absorptive material as such as glass fiber
It is attached at least one opening of bass reflex mouth.According to the technology, suppressed by sound absorptive material in bass reflex mouth
Air swirl caused by opening, thus reduces abnormal sound.
JP-UM-A-58-173989 discloses a kind of bass reflex casing for loudspeaker, wherein for example urethane is so
Padded coaming be arranged at free end, the free end and in bass reflex mouth be fixed to housing anchor portion phase
Instead.Free end is not affixed to any position.According to the technology, the vibration at the free end of bass reflex mouth becomes to be difficult to send out
It is raw, thus reduce abnormal sound.
Although however, used the technology disclosed in JP-UM-A-56-63182 or JP-UM-A-58-173989, because
It can not be adequately reduced from abnormal sound caused by bass reflex mouth for the air flowed in bass reflex mouth.
The content of the invention
The present invention is made that in view of the foregoing, and its target is reduced because the air flowed in bass reflex mouth is made
Into abnormal sound.
The present invention provides bass reflex mouth, and it includes tubular element, it is characterised in that a part of wall of tubular element
Rigidity is less than the rigidity of remainder.Moreover, the present invention provides the PA-system for being provided with bass reflex mouth.
When air flows in bass reflex mouth, sent out in capsule (outside of bass reflex mouth) and in bass reflex mouth
Raw pressure distribution, and bass reflex mouth it is inside and outside between cause air pressure difference.It is anti-in the bass according to the present invention
In loophole, the part with Low rigidity is moved according to air pressure difference on wall.As a result, bass reflex mouth is (especially, low
There is the part of Low rigidity on the wall of sound reflex port) deformation.When bass reflex mouth deforms according to air pressure difference, have low
The shape of internal face in rigidity section changes at random in each position and each moment.Thus, in the inwall of bass reflex mouth
The velocity flow profile of air is chaotic near face so that the position and moment that whirlpool occurs all change at random.Because whirlpool occurs
Position and the moment do not concentrate but scattered, in this bass reflex mouth, the growth of whirlpool can be suppressed so that can reduce by
The abnormal sound caused by whirlpool.That is, according to the PA-system for being provided with this bass reflex mouth, can reduce because bass reflex mouth
Abnormal sound caused by the air of middle flowing.
The technology according to disclosed in JP-UM-A-56-63182, sound absorptive material are attached to bass reflex mouth, and according to JP-
Technology disclosed in UM-A-58-173989, padded coaming are attached to bass reflex mouth.According to JP-UM-A-56-63182 and JP-
Technology disclosed in UM-A-58-173989, bass reflex mouth are indeformable so that the position and moment that whirlpool occurs can not disperse.Phase
Instead, in this bass reflex mouth, the position and moment that whirlpool occurs are dispersible as described above so that the growth of whirlpool can be pressed down
System.Therefore, according to this bass reflex mouth, with JP-UM-A-56-63182 and JP-UM-A-58-173989 disclosed in bass reflex
Mouth is compared, because abnormal sound can be substantially reduced caused by the air flowed in bass reflex mouth from bass reflex mouth.
Moreover, the technology according to disclosed in JP-UM-A-56-63182 and JP-UM-A-58-173989, because what whirlpool occurred
Position and moment can not disperse, even if abnormal sound is reduced, but according only to sound absorptive material and the material of padded coaming
The sound for the specific frequency that characteristic and placement location are brought is reduced.On the contrary, in this bass reflex mouth, the position of whirlpool generation
Dynamically changed with the moment according to air pressure difference, the air pressure difference also time changing.For example, at a time, whirlpool
Paracentral position is leaned in generation on the end sections of bass reflex mouth, and is occurred in another moment unlike this, whirlpool
Close to the position of open end on the end sections of bass reflex mouth.It is paracentral because being leaned on the end sections of bass reflex mouth
Sound frequency caused by the whirlpool of opening position and because of the opening position on the end sections of bass reflex mouth close to open end
Sound frequency caused by whirlpool is different.As described above, in this bass reflex mouth, because the position of whirlpool generation and moment
It is scattered, so while particular location and moment concentrate occur whirlpool and caused by abnormal sound will not become notable so that
The abnormal sound of the multi-frequency in the scheduled frequency range of similar continuous wave spectrum can be reduced.On the other hand, and JP-UM-A-56-
63182 compare with the bass reflex mouth disclosed in JP-UM-A-58-173989, according to this bass reflex mouth, because bass reflex
The air that flows in mouthful and can be also adequately reduced from abnormal sound caused by bass reflex mouth.
Brief description of the drawings
Fig. 1 is showing the section of the structure of the PA-system including bass reflex mouth according to a first embodiment of the present invention
Figure.
Fig. 2 is showing the sectional view of the structure of bass reflex mouth.
Fig. 3 is showing the side view of the structure of bass reflex mouth.
Fig. 4 is showing the low of the PA-system 1A for being provided with bass reflex mouth 30A according to a second embodiment of the present invention
Sound reflex port 30A structural section figure.
Fig. 5 is showing the low of the PA-system 1B for being provided with bass reflex mouth 30B according to a third embodiment of the present invention
The sectional view of sound reflex port 30B structure.
Fig. 6 is showing the low of the PA-system 1C for being provided with bass reflex mouth 30C according to a fourth embodiment of the present invention
Sound reflex port 30C structure.
Fig. 7 is showing the low of the PA-system 1D for being provided with bass reflex mouth 30D according to a fifth embodiment of the present invention
The sectional view of sound reflex port 30D structure.
Embodiment
Below, referring to accompanying drawing, embodiment of the present invention will be described.
<First embodiment>
Fig. 1 is showing the structure of the PA-system 1 including bass reflex mouth 30 according to a first embodiment of the present invention
Sectional view.PA-system 1 sends sound in response to the acoustic signal provided from external device (ED), and specifically, PA-system 1 is low
Sound reflex loudspeaker.PA-system 1 has capsule 10 (it is the housing of PA-system 1), bass reflex mouth 30 and with barrier film, sound
The loudspeaker unit 20 of the formation such as circle.
Capsule 10 is the hollow structure (being generally, rectangular parallelepiped protrusion part shape) formed with multiple board members.Loudspeaker
Unit 20 is fixed to the board member 12 in the board member for forming capsule 10.The board member 12 is used as stop surface.Board member 12 has
There is the circular open 14 through board member 12.Although the capsule 10 in the present embodiment is formed with multiple board members, capsule 10
Can be by the injection-molded moulded resin products for waiting formation.Moreover, the although split shed of PA-system 1 in the present embodiment
14 are arranged on the board member as stop surface (i.e. board member 12), but being open 14 can be arranged on not stop surface
On surface, such as the rear surface or side surface of capsule 10.Moreover, the shape of opening 14 is not limited to circle and can be not similar shape
Shape.
Bass reflex mouth 30 is hollow and substantially cylinder pipe, and is arranged in capsule 10.Bass reflex mouth 30
Both ends open.One open end of bass reflex mouth 30 is fixed to the edge of the opening 14 of board member 12.Bass reflex
Another open end of mouth 30 is located in capsule 10.The space outside space and capsule 10 in capsule 10 passes through bass reflex mouth
30 connect with opening 14.Therefore, the inside and outside air of capsule 10 passes through in bass reflex mouth 30.
In this manual, the line as the tube hub in bass reflex mouth 30 will be referred to as pipe axis.Moreover, in this theory
In bright book, in the both ends of bass reflex mouth 30, that end fixed to the edge of opening 14 will be referred to as outside, and in capsule
That end opened in 10 will be referred to as inner side.Moreover, in this manual, in each end of bass reflex mouth 30
Place, will be referred to as end sections along tube axis direction from the predetermined region of open end.Moreover, exist along tube axis direction
The predetermined region of the centre along tube axis direction of bass reflex mouth 30 will be referred to as middle body.
Fig. 2 is showing the sectional view of the structure of bass reflex mouth 30.Bass reflex mouth 30 is managed including the first pipe 32, second
34 and sheet element 36.First pipe 32 is the tubular element (hereinafter referred to as tubular form) of cylinder form, wherein from its one end to
The other end, inside diameter and outer dia are held substantially constant.First pipe 32 be, for example, with paper material (such as recycled writing paper) into
The paper tube of shape.The constituent material of first pipe 32 is not limited to paper and can be resin etc..
Second pipe 34 is the tubular element for having straight pipe shape, with the interior of the outer dia for being substantially equal to the first pipe 32
Portion's diameter.The material for forming the second pipe 34 is, for example, synthetic resin.The length of second pipe 34 is more shorter than the length of the first pipe 32.It is convex
Edge 35 is arranged on one end of the second pipe 34.
One side of the first pipe 32 is contained in the second pipe 34, and in the outside wall surface and the second pipe 34 for passing through the first pipe 32
Appropriate frictional force between wall and be fixed to the second pipe 34.In the case where the first pipe 32 is fixed to the second pipe 34, the first pipe
32 another side is projected into the outside of the second pipe 34 from the end opposite there is provided the end of flange 35 with the second pipe 34.The
The flange 35 of two pipes 34 is fixed to the edge of the opening 14 of board member 12 (stop surface).
First pipe 32 is provided with sheet element 36, and its bearing of trend along the first pipe 32 is from the first pipe 32 and stop surface phase
Anti- end 33 protrudes.The material for forming sheet element 36 is, for example, felt, and the rigidity of sheet element 36 is less than the firm of the first pipe 32
Degree.Circumferential direction (radial direction) extension of the sheet element 36 along the first pipe 32, and a pipe is formed, the pipe is arranged on the institute of the first pipe 32
In the position of extension.
Sheet element 36 is arranged to be covered on the end 33 of the first pipe 32.More specifically, sheet element 36 is partially fixed to
The internal face of first pipe 32.In the example in figure 2, sheet element 36 is fixed on above the whole internal face of the first pipe 32.Sheet element
36 extensions, to be protruded from the end 33 of the first pipe 32 along the bearing of trend of the first pipe 32, and to pass through the end of the first pipe 32
33 and sheet element 36 formed space 38 mode returned to inflection, and the end of its extension be fixed to the first pipe 32 outer wall
Face.The example that sheet element 36 is fixed to the method for the first pipe 32 is the method using two-sided tape.Bandage etc. can be wound, is made
To supplement, to cause the part of the outside wall surface for pasting the first pipe 32 of sheet element 36 not peel off.As described above, in bass
In reflex port 30, sheet element 36 is fixed in a manner of the end 33 along bearing of trend from the first pipe 32 protrudes.Thus, it is anti-in bass
In loophole 30, sheet element 36 to return return portion be bass reflex mouth 30 medial end.
The part being contained in the second pipe 34 of first pipe 32 is (more precisely, including the inwall fixed to the first pipe 32
The sheet element 36 in face) and the second pipe 34 form the wall of the outboard end part of bass reflex mouth 30.First pipe 32 from second
The part (more precisely, including the sheet element 36 of the internal face fixed to the first pipe 32) that pipe 34 protrudes forms bass reflex mouth
The wall of 30 middle body.The medial end portion that bass reflex mouth 30 is formed from the part that the first pipe 32 protrudes of sheet element 36
The wall divided.Because the rigidity of sheet element 36 (felt) is less than the rigidity of the first pipe 32 (paper tube) in bass reflex mouth 30,
The rigidity of the wall of the medial end part of bass reflex mouth 30 is less than the rigidity of the wall of its middle body.Therefore, in bass
In reflex port 30, the wall of medial end part is easily deformable.
In bass reflex mouth 30, sheet element 36 returns at medial end to inflection.Therefore, to return return portion at,
Bass reflex mouth 30 has expansion shape (although slighter), wherein the area in the region surrounded by sheet element 36 is towards medial extremity
Portion increases.
Fig. 3 is showing the side view of the structure of bass reflex mouth 30.(changed in the part as outside wall surface of sheet element 36
It is the outer section that the sheet element 36 for two layers is returned to inflection that sentence, which is talked about) on, in circumferential direction, prolonging along the first pipe 32 is set
Stretch the more than one cutting part 39 in direction.Therefore, when manufacturing bass reflex mouth 30, the court of sheet element 36 fixed to internal face
Fitly returned to the outside wall surface of the first pipe 32 to inflection, and be easily fixed to the outside wall surface of the first pipe 32.On the other hand, low
On sound reflex port 30, the cutting part similar with the cutting part 39 of the part as outside wall surface is not arranged in as in sheet element 36
On wall (inner portion that the sheet element 36 for two layers in other words, is returned to inflection).
Above is the structure of the PA-system 1 with bass reflex mouth 30.
Air in capsule 10 is by loudspeaker unit 20 when vibration of membrane is to vibrate, and in capsule 10, (bass is anti-
The outside of loophole 30) and bass reflex mouth 30 in occur air pressure distribution.This air pressure distribution is according to loudspeaker unit
20 every vibration of membrane and time changing.In PA-system 1, because air pressure distribution as occurring, in bass
Reflex port 30 it is inside and outside between cause air pressure difference.Generally, the air pressure and capsule in bass reflex mouth 30
Difference is caused between air pressure in 10.And the inside and outside air of capsule 10 passes through in bass reflex mouth 30.
As described above, in bass reflex mouth 30, the rigidity of the wall of medial end part is less than the wall of middle body
Rigidity.Therefore, in bass reflex mouth 30, have the medial end part (especially sheet element 36) of Low rigidity anti-along bass
Radial direction, circumferential direction and the tube axis direction of loophole 30 and the compound direction (synthetic in these directions
Direction) random motion.As a result, bass reflex mouth 30 (especially sheet element 36) deforms.In bass reflex mouth 30 according to sky
Atmospheric pressure difference and when deforming, change at random in each position and each moment in the shape of the internal face of inner side.Thus, exist
Air velocity distribution near the internal face of bass reflex mouth 30 is chaotic so that the position and moment that whirlpool occurs are all random
Change.That is, in bass reflex mouth 30, the position of the whirlpool occurred according to air pressure difference and moment do not concentrate, but dynamic
Disperse to state.Therefore, compared with conventional bass reflex mouth, in bass reflex mouth 30, the growth of whirlpool can be suppressed.
As described above, compared with conventional bass reflex mouth, according to bass reflex mouth 30, because by the way that dynamically whirlpool is sent out
Raw position and moment carry out scattered and can suppress the growth of whirlpool, so while abnormal sound caused by whirlpool is fully subtracted
It is few.That is, according to the PA-system 1 for being provided with bass reflex mouth 30, because caused by the air flowed in bass reflex mouth 30
Abnormal sound can be substantially reduced.
In the bass reflex mouth 30 of the present embodiment, the position of whirlpool generation and moment are according to the air pressure changed constantly
Difference and dynamically change.For example, at a time, whirlpool leans on paracentral opening position on the end sections of bass reflex mouth 30
Occur, and at the time of unlike this, whirlpool occurs on the end sections of bass reflex mouth 30 close to the position of open end.
By sound frequency caused by the whirlpool of paracentral opening position and in bass reflex mouth on the end sections of bass reflex mouth 30
Sound frequency caused by the whirlpool of the opening position of close open end is different on 30 end sections.As described above, at this
In the bass reflex mouth 30 of embodiment because position and moment that whirlpool occurs are disperseed, particular location and moment due to
Whirlpool concentrate occur and caused by abnormal sound no longer become notable so that can reduce in the preset frequency similar to continuous wave spectrum
The abnormal sound of multi-frequency in scope.On the other hand, according to the bass reflex mouth 30 of the present embodiment, with conventional bass reflex mouth phase
Than also fully being reduced from abnormal sound caused by bass reflex mouth because of the air flowed in bass reflex mouth.
In the bass reflex mouth 30 of the present embodiment, sheet element 36 protrudes from the end 33 of the first pipe 32, and its mode is shape
Into space 38.Thus, the wall of the inner side of bass reflex mouth 30 can be fabricated to for making it appropriate according to air pressure difference
Desired flexibility for deformation.
On the sheet element 36 of the bass reflex mouth 30 of the present embodiment, cutting part is set on the part as outside wall surface
39.In bass reflex mouth 30, because being provided with these cutting parts 39, compared with being not provided with the situation of cutting part 39, no
Only obtain sheet element 36 and be easily fixed to the advantage of the first pipe 32, and also obtain because sheet element 36 is easily deformable and
So that the advantage of abnormal sound minimizing effect can be strengthened.
Although felt is described as the preferred example of sheet element 36 in the present embodiment, sheet element 36 is not limited to hair
Felt and can be flaky resin etc..In brief, any pattern can be used, as long as material of the sheet element 36 than the first pipe 32
The low material manufacture of rigidity.Moreover, although sheet element 36 is fixed to the whole internal face of the first pipe 32 in the present embodiment,
But sheet element 36 can be fixed to a part for the internal face of the first pipe 32.Moreover, it can consolidate to the sheet element 36 that inflection is returned
The fixed whole outside wall surface to the first pipe 32, instead of a part for the outside wall surface fixed to the first pipe 32.
<Second embodiment>
Fig. 4 is showing the low of the PA-system 1A for being provided with bass reflex mouth 30A according to a second embodiment of the present invention
Sound reflex port 30A structural section figure.Except bass reflex mouth 30A, the sound equipment that PA-system 1A is similar to first embodiment fills
Put 1.
Bass reflex mouth 30A has straight pipe shape, the area in the region surrounded in this place by internal face from outboard end to
Medial end is kept substantially fixation.Bass reflex mouth 30A includes the first pipe 32A and the second pipe 36A.First pipe 32A forms low
The sound reflex port 30A wall in outside and the wall of middle body.Second pipe 36A is formed in the wall of inner side.Form the first pipe
32A material and the material for forming the second pipe 36A are identicals, and for example form the first pipe 32A and the by Unitarily molded
Two pipe 36A.The thickness of wall of the thickness of second pipe 36A wall less than the first pipe 32A.That is, in bass reflex mouth 30A,
It is less than the material of the wall of middle body by the thickness of the wall of medial end part so that the wall of medial end part
The rigidity in face is less than the rigidity of the wall of middle body.
Bass reflex mouth 30A is not provided with the sheet element 36 of first embodiment.However, bass reflex mouth 30A and bass are anti-
Loophole 30 is that the rigidity of the wall of medial end part is less than the rigidity of the wall of middle body similar to part.Therefore, low
In sound reflex port 30A, as in bass reflex mouth 30, medial end part is according to air pressure difference random motion so that
Bass reflex mouth 30A is deformed.Therefore, in the present embodiment, the advantages of the advantages of realizing to first embodiment is similar.In this implementation
In example, form the first pipe 32A and the second pipe 36A by using identical material and cause the thickness of the second pipe 36A wall to be less than the
The thickness of one pipe 32A wall, the rigidity of the wall of bass reflex mouth 30A medial end part are fabricated to less than middle body
Wall rigidity.If the however, thickness of wall of the thickness for the wall for passing through the second pipe 36A less than the first pipe 32A
And the rigidity of the wall of bass reflex mouth 30A medial end part is fabricated to the rigidity of the wall less than middle body, then
First pipe 32A constituent material and the second pipe 36A constituent material can be different.
<3rd embodiment>
Fig. 5 is showing the low of the PA-system 1B for being provided with bass reflex mouth 30B according to a third embodiment of the present invention
The sectional view of sound reflex port 30B structure.Except bass reflex mouth 30B, PA-system 1B are similar to the sound equipment of first embodiment
Device 1.
Similar with the bass reflex mouth 30A of second embodiment, bass reflex mouth 30B has from outboard end to medial end
Straight pipe shape.Bass reflex mouth 30B has the first pipe 30B and the second pipe 36B.First pipe 30B forms the outer of bass reflex mouth 30B
The wall of end part and the wall of middle body.Second pipe 36B is formed in the wall of inner side.First pipe 32B wall and
Second pipe 36B wall has same thickness.Second pipe 36B is formed with the more flexible material of the material than forming the first pipe 32B.
Second pipe 36B is fixed to the first pipe 32B by bonding agent etc..That is, in bass reflex mouth 30B, by forming medial extremity
The material of the wall of portion part than formed middle body wall material it is more flexible so that the wall of medial end part it is firm
Rigidity of the degree less than the wall of middle body.
In bass reflex mouth 30B, as in the second embodiment, the sheet element 36 of first embodiment is not provided with.So
And as with the second embodiment, bass reflex mouth 30B is with the 30 similar part of bass reflex mouth of first embodiment, inner side
The rigidity of the wall of end sections is fabricated to the rigidity of the wall less than middle body.Therefore, in bass reflex mouth 30B, such as
In bass reflex mouth 30 like that, medial end part is according to air pressure difference random motion so that bass reflex mouth 30B becomes
Shape.Therefore, in the present embodiment, the advantages of the advantages of realizing to first embodiment is similar.
<Fourth embodiment>
Fig. 6 is showing the low of the PA-system 1C for being provided with bass reflex mouth 30C according to a fourth embodiment of the present invention
Sound reflex port 30C structure.Except bass reflex mouth 30C, PA-system 1C are similar to the PA-system 1 of first embodiment.
Similar with bass reflex mouth 30A and bass reflex mouth 30B, bass reflex mouth 30C is from outboard end to medial end
With straight pipe shape.Bass reflex mouth 30C has the first pipe 32C and the second pipe 36C.First pipe 30C forms bass reflex mouth 30C
The wall of medial end part and the wall of middle body.Second pipe 36C forms the wall of outboard end part.Second pipe
36C is fixed to the edge of the opening 14 of board member 12 by bonding agent etc..The wall of first pipe 32C wall and the second pipe 36C
With same thickness.Second pipe 36C is formed with the more flexible material of the material than forming the first pipe 32C.Second pipe 36C passes through viscous
Connect agent etc. and be fixed to the first pipe 32C.That is, in bass reflex mouth 30C, the material of the wall by forming outboard end part
Expect that the material of the wall than forming middle body is more flexible so that the rigidity of the wall of outboard end part is less than middle body
The rigidity of wall.
Bass reflex mouth 30C is with first to 3rd embodiment bass reflex mouth 30 to the similar parts of 30B, in bass
Reflex port 30C it is inside and outside between border near, the rigidity of the walls of bass reflex mouth 30C end sections is less than
The rigidity of the wall of middle body.Therefore, in bass reflex mouth 30C, as in bass reflex mouth 30, outboard end portion
Divide according to air pressure difference random motion so that bass reflex mouth 30C is deformed.Therefore, in the present embodiment, realize with first in fact
The advantages of the advantages of applying is similar.
For example, bass reflex mouth 30C the second pipe 36C wall can be deformed according to air pressure difference and possessed rigidity
Reach and enable bass reflex mouth 30C to keep the degree relative to the self―sustaining of board member 12.
Second pipe 36C can have a structure in which, wherein repeating the first stiffness region along the second pipe 36C circumferential direction
With the second stiffness region, the rigidity that first stiffness region has is less than the height of the wall of middle body, the second stiffness region
The rigidity that domain has is more than the rigidity of the first stiffness region.According to the embodiment, the part of the second pipe 36C the first stiffness region
According to air pressure difference random motion, to cause bass reflex mouth 30C deformable, and pass through the second pipe 36C the second stiffness region
The some parts in domain, bass reflex mouth 30C, which can be remained, self to be kept.
<5th embodiment>
Fig. 7 is showing the low of the PA-system 1D for being provided with bass reflex mouth 30D according to a fifth embodiment of the present invention
The sectional view of sound reflex port 30D structure.Except bass reflex mouth 30D, PA-system 1D are similar to the sound equipment of first embodiment
Device 1.
The difference of bass reflex mouth 30 of bass reflex mouth 30D and first embodiment is that it has sheet element 36D, generation
For sheet element 36.Sheet element 36D is partially fixed to the internal face of the first pipe 32, and extends to from the edge of end 33 of the first pipe 32
The bearing of trend of first pipe 32 protrudes.In bass reflex mouth 30D, the end of sheet element 36D protuberance is bass reflex mouth
30D medial end.The sheet element 36D protruded from the first pipe 32 part forms bass reflex mouth 30D medial end part
Wall.
In bass reflex mouth 30D, sheet element 36D is not returned at medial end to inflection.However, bass reflex mouth 30D
It is that the wall of medial end part is formed with sheet element 36D with 30 similar part of bass reflex mouth, sheet element 36D is from first
The end 33 of pipe 32 protrudes, with so that the rigidity of the wall of medial end part is less than the rigidity of the wall of middle body.
Therefore, in bass reflex mouth 30D, as bass reflex mouth 30, the sheet element 36D on medial end part is according to air pressure
Power difference random motion so that bass reflex mouth 30D is deformed.Therefore, in the present embodiment, realize and phase the advantages of first embodiment
As advantage.
<Other embodiment>
Although being illustrated above the first to the 5th embodiment of the present invention, other implementations of the present invention are contemplated
Example, for example, it is as follows：
(1) in bass reflex the mouth 30B and 30D of the first to the 3rd and the 5th embodiment, the wall of medial end part
Rigidity be less than middle body wall rigidity, and in the bass reflex mouth 30C of fourth embodiment, outboard end part
The rigidity of wall is less than the rigidity of the wall of middle body.However, the low position of rigidity is not limited to these positions.That is, in root
Necessary to be only that in bass reflex mouth according to the present invention, at least one of rigidity of wall is less than the rigidity of remainder.
Because if at least one of rigidity of wall is low, the part with Low rigidity is moved according to air pressure difference, is made
Obtain the deformation of bass reflex mouth.And if the part deformation with Low rigidity, then near the internal face of the part with Low rigidity
Air velocity distribution dynamically upset so that the position and moment that whirlpool occurs are not concentrated but scattered.As described above,
It is less than the rigidity of remainder by the rigidity of at least a portion wall of bass reflex mouth, as other embodiment,
Abnormal sound is reduced caused by the air flowed in bass reflex mouth.
(2) although according to the present invention it is necessary be only wall at least one of rigidity be less than bass reflex mouth in its
The rigidity of remaining part point, it is preferred that the rigidity of the wall of at least one end sections of bass reflex mouth is less than central portion
The rigidity of the wall divided.First reason is, when on the centrally located part in the part with Low rigidity compared with, with Low rigidity
Part be located at have when on end sections Low rigidity part be easier move.Second reason is to occur with whirlpool in center
Compared on part, whirlpool tends to be prone on end sections, and air outwards flows from bass reflex mouth in this place, and with
Compared on center, the position and the dispersion effect at moment that whirlpool occurs are more preferable on end sections.Moreover, with outboard end part
The pattern of rigidity of the rigidity wall that is less than middle body of wall compare, be less than in the rigidity of the wall of interior end part
Under the pattern of the rigidity of the wall of middle body, the effect for reducing abnormal sound is more preferable.First reason is, because medial end portion
Divide and be not blocked surface support, so compared with outboard end part, medial end part is easy to move.Second reason is, with
Compared with outer end part (it is continuous with stop surface), tend on interior end part (continuous not with stop surface)
It is prone to whirlpool, and the position of whirlpool generation and the dispersion effect at moment are more preferable.Moreover, the bass reflex mouth according to the present invention
It is not limited to pattern of the rigidity less than the rigidity of the wall of middle body of the wall of an end sections；But both ends part
Wall rigidity may be less than middle body wall part rigidity.
(3) the low specific pattern of rigidity is not limited to the pattern of embodiment.For example, in the bass reflex mouth of first embodiment
In 30, the cutting part 39 of sheet element 36 can be not only provided on the part as outer wall, and is arranged on the portion as inwall
On point.According to the pattern, the rigidity of the wall of sheet element 36 is less than in first embodiment, and it is considered as sheet element 36 and is easier
Ground deforms.
(4) cutting part 39 is arranged on the outer wall of the sheet element 36 of the bass reflex mouth 30 as first embodiment.However, this
The cutting part 39 of sample is not essential.
(5) in bass reflex mouth, forming the structure of the part of the wall of the end sections with Low rigidity can be set
To be detachably attached to the middle body with high rigidity.
(6) except sheet element 36 is to return portion is returned, the bass reflex mouth 30 of first embodiment has straight pipe shape.So
And the medial end part of bass reflex mouth 30 can have the expansion shape from the end 33 of the first pipe 32 to medial end.
Moreover, not only the medial end part of bass reflex mouth 30 but also the outboard end part of bass reflex mouth 30 can have expansion
Shape.Moreover, not only end sections of bass reflex mouth 30 but also both ends part can be provided with expansion shape.And
And in bass reflex mouth 30A to the 30D of the second to the 5th embodiment, bass reflex mouth 30A to 30D inner side and outer side
End sections can similarly have expansion shape.
(7) wall of the end sections of bass reflex mouth can have with the internal layer component for forming internal face and form outer wall
The sandwich construction that the outer component in face is formed.In this case, the rigidity of at least internal layer component is fabricated to less than middle body
Wall rigidity so that at least internal layer component moves according to air pressure difference, to cause bass reflex mouth deformable.
(8) technical characteristic of embodiment can be combined as.
(9) except that the PA-system of these embodiments can be supplied into market, adopted in the PA-system of these embodiments
Bass reflex mouth can also be provided independently to market.Because the PA-system of these embodiments can be by anti-by bass
Loophole is attached to PA-system to realize.Moreover, the PA-system of these embodiments can be with installed in musical instrument (such as Electronic Keying
Disk) on state provide arrive market.
Here, the details of above-described embodiment is summarized as follows.
[1] present invention provides bass reflex mouth, and it includes：
Tubular element,
Wherein, the rigidity of a part for the wall of tubular element is less than the rigidity of tubular element remainder.
[2] for example, the rigidity of the wall of at least one end of tubular element is less than on the axial direction of tubular element
The rigidity of the wall of the middle body of tubular element in the axial direction
[3] for example, along the thickness of at least one end of tubular element radial direction less than institute radially
The thickness of middle body is stated, the radial direction is perpendicular to the axial direction.
[4] for example, at least one end and the middle body form the part being integrated.
[5] for example, at least one end sections and middle body are formed as separated part, and for described at least one
The rigidity of the part of end is less than the rigidity of the part for the middle body.
[6] for example, the part at least one end is sheet element.
[7] for example, the internal face of at least one end sections flushes with the internal face of middle body, and at least one end
Partial outside wall surface is continuous via the internal face of stepped portion and middle body.
[8] for example, forming the material of wall of the material of the wall of at least one end than forming the middle body
Material is more flexible.
[9] for example, bass reflex mouth further comprises：
Sheet element, ratio of rigidity tubular element is lower,
Wherein, sheet element is fixed to tubular element and protruded from one end of tubular element along the bearing of trend of tubular element.
[10] for example, sheet element is partially fixed to the internal face of tubular element, the one end from tubular element is extended to
Protrude along the bearing of trend of tubular element, and returned then to inflection with so that forming the end by tubular element and sheet element shape
Into a space.
[11] for example, the multiple cutting parts in axial direction extended are arranged in sheet element of turning back, the sheet element of turning back
Outside wall surface fixed to tubular element.
[12] for example, sheet element is turned back to cause the space in the transverse cross-sectional area with axial direction to extend with edge
Direction extends and become much larger.
[13] for example, PA-system includes：
Any one bass reflex mouth in [12] is arrived according to project [1]；With
Housing with opening,
Wherein, bass reflex mouth set in the housing and bass reflex mouth one end be fixed to opening edge.
[14] for example, in the end of the tubular element of bass reflex mouth, the rigidity close to the wall of the end of opening is small
In the rigidity of the wall of the middle body of the tubular element of bass reflex mouth.
Claims (14)
1. a kind of bass reflex mouth, including：
Tubular element,
Wherein, the rigidity of a part for the wall of tubular element is less than the rigidity of the remainder of tubular element.
2. bass reflex mouth as claimed in claim 1, wherein, at least the one of tubular element on the axial direction of tubular element
The rigidity of the wall of individual end is less than the rigidity of the wall of the middle body of tubular element in the axial direction.
3. bass reflex mouth as claimed in claim 2, wherein, along at least one end of tubular element radial direction
Thickness is less than the thickness of the middle body radially, and the radial direction is perpendicular to the axial direction.
4. bass reflex mouth as claimed in claim 2 or claim 3, wherein, at least one end and the middle body are formed
The part being integrated.
5. bass reflex mouth as claimed in claim 2 or claim 3, wherein, at least one end and the middle body are formed
For separated part；With
Wherein, the rigidity for the part of at least one end is less than the rigidity of the part for the middle body.
6. bass reflex mouth as claimed in claim 5, wherein, the part at least one end is sheet element.
7. the bass reflex mouth as any one of claim 2 to 6, wherein, the internal face of at least one end
Flushed with the internal face of middle body；With
Wherein, the outside wall surface of at least one end is continuous via stepped portion and the internal face of the middle body.
8. such as the bass reflex mouth any one of claim 2,3,5,6 and 7, wherein, form at least one end
Wall wall of the material than forming the middle body material it is more flexible.
9. such as the bass reflex mouth any one of claim 1,2,3,5 and 8, further comprise：
Sheet element, ratio of rigidity tubular element is lower,
Wherein, sheet element is fixed to tubular element and protruded from one end of tubular element along the bearing of trend of tubular element.
10. bass reflex mouth as claimed in claim 9, wherein, sheet element is partially fixed to the internal face of tubular element, prolongs
Stretch and protruded for the bearing of trend from the one end of tubular element along tubular element, and returned then to inflection to cause by tubulose structure
The end of part and sheet element form a space；With
Wherein, turn back sheet element end be fixed to tubular element outside wall surface.
11. bass reflex mouth as claimed in claim 10, wherein, the multiple cutting parts in axial direction extended, which are arranged on, turns back
In sheet element, the sheet element of turning back is fixed to the outside wall surface of tubular element.
12. the bass reflex mouth as described in claim 10 or 11, wherein, sheet element is turned back to cause with axial direction
Transverse cross-sectional area in space with along bearing of trend extend and become much larger.
13. a kind of PA-system, including：
Bass reflex mouth as any one of claim 1 to 12；With
Housing with opening,
Wherein, bass reflex mouth set in the housing and bass reflex mouth one end be fixed to opening edge.
14. PA-system as claimed in claim 13, wherein, it is close to open in the end of the tubular element of bass reflex mouth
The rigidity of the wall of the end of mouth is less than the rigidity of the wall of the middle body of the tubular element of bass reflex mouth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016104627A JP6709537B2 (en) | 2016-05-25 | 2016-05-25 | Bass reflex port and audio equipment |
| JP2016-104627 | 2016-05-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107438212A true CN107438212A (en) | 2017-12-05 |
| CN107438212B CN107438212B (en) | 2019-12-27 |
Family
ID=58772745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710379202.5A Active CN107438212B (en) | 2016-05-25 | 2017-05-25 | Bass reflex port and acoustic apparatus |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3249947B1 (en) |
| JP (1) | JP6709537B2 (en) |
| CN (1) | CN107438212B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7066372B2 (en) | 2017-11-02 | 2022-05-13 | シャープ株式会社 | Terminal equipment, base station equipment, and communication methods |
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| JPS58173989U (en) * | 1982-05-17 | 1983-11-21 | 松下電器産業株式会社 | Phase reversal cabinet for speakers |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6709537B2 (en) | 2020-06-17 |
| EP3249947A1 (en) | 2017-11-29 |
| EP3249947B1 (en) | 2021-04-07 |
| JP2017212606A (en) | 2017-11-30 |
| CN107438212B (en) | 2019-12-27 |
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