WO2009090761A1 - Diaphragme pour haut-parleur et dispositif de haut-parleur - Google Patents

Diaphragme pour haut-parleur et dispositif de haut-parleur Download PDF

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Publication number
WO2009090761A1
WO2009090761A1 PCT/JP2008/053661 JP2008053661W WO2009090761A1 WO 2009090761 A1 WO2009090761 A1 WO 2009090761A1 JP 2008053661 W JP2008053661 W JP 2008053661W WO 2009090761 A1 WO2009090761 A1 WO 2009090761A1
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WO
WIPO (PCT)
Prior art keywords
diaphragm
density portion
density
speaker
high density
Prior art date
Application number
PCT/JP2008/053661
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English (en)
Japanese (ja)
Inventor
Kazuharu Kawata
Yoshihiro Sato
Original Assignee
Pioneer Corporation
Mogami Denki Corporation
Victor Company Of Japan, Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Corporation, Mogami Denki Corporation, Victor Company Of Japan, Limited filed Critical Pioneer Corporation
Priority to CN2008801240791A priority Critical patent/CN101919268A/zh
Priority to JP2009549949A priority patent/JPWO2009090761A1/ja
Publication of WO2009090761A1 publication Critical patent/WO2009090761A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers

Definitions

  • the present invention relates to a speaker diaphragm and a speaker device.
  • a speaker diaphragm that is lightweight and thin is highly efficient.
  • the diaphragm is relatively thin, the distortion of the reproduced sound increases due to the division resonance.
  • a speaker diaphragm that is made of paper mainly composed of pulp is formed to have a substantially uniform thickness on the entire surface, and is formed so as to partially differ in the accumulated weight (for example, Patent Document 1). reference).
  • the diaphragm is reinforced by the high density portion.
  • the speaker diaphragm is formed so that the density is gradually different from the low density region, the medium density portion, and the high density region along the circumferential direction of the diaphragm, so that the thickness of the diaphragm is substantially uniform.
  • the divided resonance cannot be sufficiently reduced.
  • a diaphragm capable of further reducing unnecessary vibration such as split resonance is desired.
  • the speaker device is used in various environments, and for example, it may be desired to radiate a reproduced sound having directivity in a predetermined direction.
  • the present invention is an example of a problem to deal with such a problem. That is, with a relatively simple structure, unnecessary vibrations such as split resonance are reduced, peak dip appearing in frequency characteristics due to split resonance, etc., and with a relatively simple structure, directivity in a predetermined direction It is an object of the present invention to radiate reproduced sound.
  • the speaker diaphragm according to the present invention includes a high-density portion and a low-density portion, and the high-density portion is formed in a shape protruding in a direction substantially orthogonal to the surface of the diaphragm, It is characterized by being surrounded by a step portion formed at the boundary with the low density portion.
  • the speaker device according to the present invention includes a speaker diaphragm having a high-density portion and a low-density portion, and the high-density portion is formed in a shape protruding in a direction substantially perpendicular to the surface of the diaphragm. And is surrounded by a step portion formed at the boundary between the high density portion and the low density portion.
  • FIG. 1 is a figure for demonstrating the speaker apparatus which employ
  • (A) is a half cross-sectional view of a speaker apparatus and a diaphragm
  • (B) is ( It is the figure which expanded the high-density part and low-density part vicinity of the diaphragm shown to A)
  • (C) is a figure which shows the modification of the diaphragm shown to (A).
  • (A) is a perspective view of a diaphragm for speakers
  • (B) is a vibration shown in (A).
  • FIG. 7 is a diagram showing the density ( ⁇ ) of the plate at line AB or CD, where (C) is the thickness of the diaphragm shown at (A) at line AB or CD (t ).
  • (A) to (F) are views for explaining a method of manufacturing a speaker diaphragm according to a first specific example of the present invention.
  • (A)-(F) is a figure for demonstrating the manufacturing method of the diaphragm for speakers concerning the 2nd specific example of this invention.
  • (A) to (F) are views for explaining a method of manufacturing a speaker diaphragm according to a third specific example of the present invention.
  • FIG. 1 A), (B) is a figure for demonstrating the drying method of the manufacturing method of the diaphragm for speakers which concerns on one specific example of this invention.
  • (A) to (E) are views for explaining a speaker diaphragm according to another embodiment of the present invention. It is a figure for demonstrating the diaphragm for speakers which concerns on other embodiment of this invention, (A) is the surface in the AB line or CD line of the diaphragm which concerns on other embodiment of this invention. FIG.
  • FIG. 7 is a diagram showing the density (S)
  • (B) is a diagram showing the density ( ⁇ ) at the AB line or CD line of the diaphragm
  • (C) is the AB line of the diaphragm or It is a figure which shows the thickness (t) in CD line.
  • (A) is a figure for demonstrating the acoustic frequency characteristic of the speaker apparatus (JJ) which employ
  • (B) is the speaker apparatus which employ
  • a speaker diaphragm includes a high-density portion and a low-density portion, and the high-density portion is formed in a shape protruding in a direction substantially orthogonal to the surface of the diaphragm. It is characterized by being surrounded by a step portion formed at the boundary between the portion and the low density portion.
  • the speaker diaphragm includes, for example, a low density portion and a high density portion, and the high density portion is formed in a shape protruding in a direction substantially perpendicular to the surface of the diaphragm.
  • the density, rigidity, Young's modulus, etc. differ between the low density part and the high density part, reducing unnecessary vibrations such as split vibrations. can do.
  • the high-density portion is formed in an area having a predetermined shape surrounded by a step portion formed at the boundary between the high-density portion and the low-density portion, a sound having a desired acoustic characteristic is emitted. be able to.
  • the density is formed so as to be gradually different from the low density region, the medium density portion, and the high density region, and the thickness of the diaphragm is substantially uniform.
  • the speaker diaphragm according to the present invention has a three-dimensional step formed at the boundary between the high-density part and the low-density part, and the high-density part becomes the low-density part. Since the high-density part is surrounded by the step part, the rigidity is clearly different between the low-density part and the high-density part, and unnecessary vibration such as split resonance is further reduced. be able to.
  • the speaker device employing the speaker diaphragm has frequency characteristics of reproduced sound.
  • the appearing peak dip can be reduced.
  • a peak appears at the high-frequency resonance frequency found in the frequency characteristics due to divided vibrations, etc., whereas in the speaker diaphragm according to the present invention, the peak is higher than the audible range. It has the characteristic of appearing, and the reproduced sound has a relatively high sound quality.
  • FIG. 1 is a diagram for explaining a speaker device employing a speaker diaphragm according to an embodiment of the present invention.
  • FIG. 1A is a half sectional view of the speaker device and the diaphragm
  • FIG. 1B is an enlarged view of the vicinity of the high density portion and the low density portion of the diaphragm shown in FIG.
  • FIG. 2 is a diagram for explaining a speaker diaphragm according to an embodiment of the present invention.
  • FIG. 2A is a perspective view of a speaker diaphragm
  • a speaker device 10 that employs a speaker diaphragm 4 according to this embodiment includes a magnetic circuit 1 composed of, for example, a magnet 1A, a plate 1B, and a yoke 1C, and It has a voice coil 3 disposed in the magnetic gap and wound around the voice coil bobbin 2, and a speaker diaphragm 4 whose center is joined to the voice coil bobbin 2.
  • the speaker diaphragm 4 (hereinafter referred to as the diaphragm 4) is fixed to the speaker frame 7 by an edge 5 and a gasket 6 so as to vibrate freely.
  • the voice coil bobbin 2 is fixed to the speaker frame 7 via a damper 8.
  • the opening of the voice coil bobbin 2 is covered with a center cap 9.
  • the diaphragm 4 is formed in a prescribed shape such as a cone shape, a flat plate shape, or a circular shape, for example.
  • the diaphragm 4 according to the present embodiment is formed in a cone shape.
  • the forming material of the diaphragm 4 includes fibers, resins, ceramics, metals, and the like.
  • fibers 40 are employed as a material for forming the diaphragm 4 according to the present embodiment.
  • the fibers include wood pulp fibers, non-wood pulp fibers, chemical fibers, synthetic fibers, animal fibers, plant fibers, organic fibers, inorganic fibers, glass fibers, carbon fibers, and ceramic fibers.
  • the diaphragm 4 includes a high density portion 41, a low density portion 42, a step portion 43, an inner peripheral portion 45, an outer peripheral portion 46, and an outer peripheral step portion (step portion). 48).
  • the high density portion 41 corresponds to an embodiment of the high density portion according to the present invention.
  • the low density portion 42 corresponds to an embodiment of the low density portion according to the present invention.
  • the step portion 43 corresponds to an embodiment of the step portion according to the present invention.
  • a high density portion 41 and a substantially flat low density portion 42 are formed on the body portion of the diaphragm 4.
  • a plurality of high density portions 41 are formed in the body portion.
  • the high density part 41 and the low density part 42 will be described in detail.
  • the high-density portion 41 is formed to have a higher density than the low-density portion 42 by the diaphragm forming material. Specifically, the high density portion 41 is formed by arranging fibers, which are a material for forming the diaphragm, at a higher density than other regions (low density portions 42).
  • the high density portion 41 is formed in a shape protruding in a direction substantially orthogonal to the surface of the diaphragm 4.
  • the protruding portions of the high-density portion 41 are formed on both or either one of the front surface side and the back surface side on the acoustic radiation side (SD).
  • the high density portion 41 according to the present embodiment is formed in a shape protruding in a direction orthogonal to the surface on the acoustic radiation side (SD).
  • the diaphragm 4 has a stepped portion 43 formed at the boundary between the high density portion 41 and the low density portion 42.
  • the high density portion 41 is surrounded by a step portion 43 formed at the boundary between the high density portion 41 and the low density portion 42. That is, the high density portion 41 is formed in an area surrounded by the step portion 43 formed at the boundary with the low density portion 42 in the entire diaphragm 4.
  • the high density portion 41 is formed in a clearly projecting shape so that a stepped portion 43 is formed at the boundary portion with the low density portion 42.
  • the diaphragm 4 is formed at the boundary between the high density portion 41 and the low density portion 42 so that the density change rate is larger than that of other portions.
  • the high density portion 41 and the low density portion 42 are clearly separated, the high density portion 41 is surrounded by the step portion 43, and the high density portion 41 and the low density portion 42. Since the density, stiffness value, Young's modulus, and the like are clearly different, unnecessary vibrations such as split resonance can be reduced.
  • the high density portion 41 is formed thicker than the low density portion 42. For this reason, since the rigidity value, Young's modulus, and the like are clearly different between the high density portion 41 and the low density portion 42, unnecessary vibrations such as split resonance can be further reduced.
  • the high density portion 41 is provided with a flat portion 44 surrounded by a stepped portion 43 of the high density portion 41.
  • the flat portion 44 of the high-density portion 41 has a uniform thickness (flat) along the radial direction as shown in FIGS. 1 (A) to 1 (D) and FIG. 2 (1). In the circumferential direction, it is formed to have a uniform thickness along the curved surface of the diaphragm. Since the flat portion 44 is formed, it is possible to prevent a phase difference from occurring in the sound wave emitted from the flat portion 44.
  • the flat portion 44 is formed, it is possible to suppress a large phase difference between the sound waves emitted from the high density portion 41 and the low density portion 42, and to provide high-quality reproduced sound. can do. Further, by making the step portion (thickness: size) of the step portion 43 smaller than, for example, the thickness of the speaker edge 5 on the surface side of the vibration plate 42, the phase difference of the sound wave by the step portion 43 can be made relatively small. High quality sound can be provided.
  • the high density portion 41 is not limited to the form in which the area surrounded by the step portion 43 is formed flat.
  • the high-density portion 41 may have an area surrounded by the stepped portion 43 formed in a curved shape such as a convex shape, a concave shape, or a corrugated shape in the acoustic radiation direction. Has a higher stiffness.
  • the step (thickness) of the stepped portion 43 is formed smaller than the thickness of the edge 5 or smaller than the thickness of the low density portion 42.
  • the phase difference between sound waves emitted from the entire vibrating body including the diaphragm and the edge can be made relatively small, and high-quality reproduced sound can be provided. Can do.
  • the diaphragm 4 according to the present embodiment is formed such that the density ⁇ 41 of the high-density portion 41 is higher than the density ⁇ 42 of the low-density portion 42. .
  • the diaphragm 4 according to this embodiment is formed such that the thickness t41 of the high-density portion 41 is thicker than the thickness t42 of the low-density portion 42. ing.
  • the inventor of the present application for example, as a raw material, NUKP (unbleached kraft pulp) was beaten and adjusted to a beating degree of 20 ° SR (shopper rigger). 4 was produced.
  • the low density portion 42 of the diaphragm 4 has a surface thickness of 0.22 mm, a density of 0.626 g / cm 3 , a Young's modulus of 2.45 ⁇ 10 10 dyne / cm 2
  • the high density portion 41 has a surface thickness of 0.260 mm.
  • the density is 0.727 g / cm 3 and the Young's modulus is 2.99 ⁇ 10 10 dyne / cm 2 .
  • the high density portion 41 according to the present embodiment is formed to extend along the radial direction from the inner peripheral portion 45 to the outer peripheral portion 46 of the diaphragm 4. Further, the high density portion 41 according to the present embodiment is formed in a predetermined shape such as an elliptical shape or a rectangular shape, for example, and a plurality of the high density portions 41 are radially formed on the diaphragm 4. In the present embodiment, the diaphragm 4 has four elliptical high-density portions 41 formed radially. The diaphragm 4 in which the high-density portion 41 described above is formed can suppress unnecessary vibration such as split resonance because the entire diaphragm has high rigidity.
  • the diaphragm 4 has an outer peripheral step portion 48 formed in the outer peripheral portion 46 along the circumferential direction.
  • the outer peripheral step portion 48 is an attachment portion of the speaker edge 5. Further, if necessary, the speaker edge 5 may be attached after cutting the outer peripheral stepped portion 48 or the like.
  • FIGS. 3A to 3F are views for explaining a method for manufacturing a speaker diaphragm according to a first specific example of the present invention.
  • the diaphragm 4 according to this specific example is formed by making a raw material mainly composed of wood pulp, for example.
  • a wire mesh 22 formed in a shape corresponding to the shape of the diaphragm 4 is disposed in the papermaking tank 201 of the manufacturing apparatus 20.
  • a liquid 401 in which, for example, fibers 40 that are raw materials of the diaphragm 4 and water are mixed is put into the papermaking tank 201, and papermaking is performed while reducing the lower side of the metal mesh 22 of the papermaking tank 201 with a pump.
  • the mold 23 in which the holes 231 are formed at positions corresponding to the high density portions 41 is placed on the wire mesh 22 on which the paper making is performed.
  • paper making is performed again.
  • FIGS. 3 (E) and 3 (F) after paper making, the mold 23 is removed, the wire mesh 22 is pulled up, and the diaphragm 4 is taken out.
  • the diaphragm 4 is dried.
  • the diaphragm 4 in which the high density portion 41 and the low density portion 42 are formed can be easily manufactured. it can.
  • FIGS. 4 (A) to 4 (F) are diagrams for explaining a method for manufacturing a speaker diaphragm according to a second specific example of the present invention.
  • the wire mesh 22 is arranged in the papermaking tank 201 of the manufacturing apparatus 20 and the upper portion of the wire mesh 22 is arranged.
  • the mold 23 in which the hole 231 is formed is disposed.
  • the liquid 401 in which the fibers 40 that are the raw materials of the diaphragm 4 and water are mixed is put into the papermaking tank 201, and papermaking is performed while reducing the lower side of the wire mesh 22 of the papermaking tank 201 with a pump. .
  • a portion corresponding to the high density portion 41 of the diaphragm 4 is formed on the metal mesh 22.
  • FIGS. 4C and 4D after the mold 23 is removed, papermaking is performed again.
  • FIGS. 4 (E) and 4 (F) after paper making, the mold 23 is removed, the metal mesh 22 is pulled up, and the diaphragm 4 is taken out.
  • the diaphragm 4 is dried.
  • the diaphragm 4 according to the present invention can be easily produced.
  • FIGS. 5A to 5H are views for explaining a method for manufacturing a speaker diaphragm according to a third specific example of the present invention.
  • the high density portion 41 of the diaphragm 4 has a three-layer structure by performing the paper making process three times. Specifically, as shown in FIGS. 5A and 5B, first, a wire mesh 22 formed in a shape corresponding to the shape of the diaphragm 4 is disposed in the papermaking tank 201 of the manufacturing apparatus 20. .
  • a liquid 401 in which, for example, fibers 40 that are raw materials of the diaphragm 4 and water are mixed is put into the papermaking tank 201, and papermaking is performed while reducing the lower side of the metal mesh 22 of the papermaking tank 201 with a pump.
  • the mold 23 in which the holes 231 are formed at positions corresponding to the high-density portions 41 is placed on the wire mesh 22 on which the paper making is performed.
  • paper making is performed again.
  • a portion corresponding to the high density portion 41 of the diaphragm 4 is formed on the metal mesh 22.
  • FIGS. 5E and 5F after the mold 23 is removed, papermaking is performed again.
  • the mold 23 is removed, the wire mesh 22 is pulled up, and the diaphragm 4 is taken out.
  • the diaphragm 4 is dried.
  • the high density portion 41 of the diaphragm 4 has a three-layer structure by performing the paper making process three times. For this reason, the diaphragm 4 is formed with a high-rigidity high-density portion 41 and a low-density portion 42 having a three-layer structure, and the entire diaphragm is highly rigid.
  • the high density part 41 may be formed from a plurality of layers having different densities.
  • FIGS. 6A and 6B are views for explaining a drying method of the speaker diaphragm manufacturing method according to one specific example of the present invention.
  • a heating unit 32 and a shielding plate 33 are disposed on an upper portion of a pot (oven) 31.
  • the diaphragm 4 is fixed to the lower part of the drying device 30 by a fixing part 34, and the lower part of the diaphragm 4 is decompressed by a suction part 35.
  • the drying device 30 for example, gas or the like is burned from the heating unit 32 and dehydrated and sucked by the lower suction unit 35 to dry the diaphragm 4 with hot air.
  • gas or the like is burned from the heating unit 32 and dehydrated and sucked by the lower suction unit 35 to dry the diaphragm 4 with hot air.
  • the diaphragm 4 in which the high density portion 41 and the low density portion 42 are formed can be easily produced.
  • the present invention is not limited to this form.
  • the diaphragm for the speaker according to the present invention is manufactured by pressing the diaphragm. May be.
  • FIG. 7A to 7E are views for explaining a speaker diaphragm according to another embodiment of the present invention. The description of the same configuration as the above embodiment is omitted.
  • the diaphragm 4B may have a recess formed on the back surface side of the high density portion 41B. Specifically, in the diaphragm 4B, a concave portion is formed on the surface side facing the surface on which the protruding portions of the high density portion 41B are formed. A stepped portion 43 is formed at the boundary between the concave portion of the high density portion 41B and the low density portion.
  • the diaphragm 4D has a flat boundary between the high density portion 41D and the low density portion 42 on the surface side in the acoustic radiation direction (SD), and the back surface side of the high density portion 41D. Convex parts (protrusions) are formed on the surface. A stepped portion 43 is formed at the boundary between the convex portion of the high density portion 41D and the low density portion.
  • the diaphragm 4E is formed in a bowl shape, a high density part 41E is formed at the bottom of the diaphragm 4, and a low density part 42E is formed at the other part. Yes. Since the high density portion 41E is formed at the bottom of the diaphragm, the diaphragm 4 has high rigidity.
  • the diaphragm 4F has a high density portion 41F formed in an annular shape on the diaphragm 4, and a low density portion 42F formed in other portions. Specifically, the high density portion 41F is formed along the circumferential direction. With the diaphragm 4F having this configuration, the divided vibration can be further reduced.
  • FIG. 8A is a diagram for explaining the surface density (S (g / cm 2 )) of a speaker diaphragm 4G according to another embodiment of the present invention
  • FIG. 8B is a diagram of the diaphragm 4G
  • FIG. 8C is a diagram for explaining the thickness t (mm) of the diaphragm 4G.
  • the speaker diaphragm 4G is substantially the same as the diaphragm 4 shown in FIG. The description of the same configuration as that in the above embodiment is omitted.
  • the diaphragm 4G according to the present embodiment is formed such that the surface density S41 of the high density portion 41 is higher than the surface density S42 of the surface density 42 of the low density portion.
  • the density ⁇ 41 of the high-density portion 41 is formed to be lower than the density ⁇ 42 of the low-density portion 42.
  • the diaphragm 4G according to the present embodiment is formed such that the thickness t41 of the high density portion 41 is thicker than the thickness t42 of the low density portion.
  • the speaker diaphragm 4G can be manufactured, for example, by a manufacturing method substantially similar to the manufacturing method of the speaker diaphragm according to the third specific example. Specifically, for example, by pressing only the low-density portion 42 of the speaker diaphragm 4G after papermaking, the surface density of the high-density portion 41 of the diaphragm 4G is larger than the surface density of the low-density portion 42. The density of the density part 41 can be formed smaller than the density of the low density part 42. Further, the press process may be adjusted so that the density of the high density portion 41 is substantially the same as the density of the low density portion 42.
  • the low-density portion 42 and the high-density portion 41 may be pressed so that the density of the high-density portion 41 is substantially the same as or smaller than the density of the low-density portion 42.
  • the speaker diaphragm 4G is formed such that the surface density of the high density portion 41 is larger than the surface density of the low density portion 42, and therefore the rigidity of the high density portion 41 is relatively large.
  • the internal loss of the high-density portion 41 can be made relatively large, and unnecessary vibration such as divided vibration is reduced. be able to.
  • FIG. 9A is a diagram for explaining the acoustic frequency characteristics of the speaker device (JJ) employing the papermaking diaphragm according to the comparative example
  • FIG. 9B is a diagram illustrating the diaphragm according to the embodiment of the present invention. It is a figure for demonstrating the acoustic frequency characteristic of the employ
  • the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure (SPL: Sound pressure level) (dB (decibel)).
  • a diaphragm of a comparative example using general papermaking more specifically, a speaker employing a diaphragm having a uniform thickness and a uniform density without a high density portion and a low density portion.
  • the acoustic characteristics of the device (JJ) and the acoustic characteristics of the speaker device (PP) employing the diaphragm according to the embodiment of the present invention shown in FIGS. 1 (A) and 1 (B) were measured. As a result of the above measurement, as shown in FIGS.
  • the high density portion has a relatively high Young's modulus, and the rigidity of the entire diaphragm is relatively low. Since it is high, according to the speaker device employing the diaphragm according to the present invention, it is possible to perform high-quality sound reproduction particularly in the mid-range.
  • 9A and 9B according to the speaker device (PP) employing the diaphragm according to the present invention, the frequency characteristics in the vicinity of 2 kHz are relatively flattened. In this frequency region, high-quality sound reproduction can be performed. Further, as shown in FIGS.
  • the speaker device (PP) employing the diaphragm according to the present invention sound is generated from the low frequency range to the middle frequency range (about 300 to 1 kHz).
  • the pressure is larger than the comparative example, specifically about 1 dB higher. For this reason, the speaker device (PP) employing the diaphragm according to the present invention can perform reproduction with high sound quality at a relatively high sound pressure.
  • the diaphragm 4 according to the present invention includes the high density portion 41 and the low density portion 42, and the high density portion 41 has a shape protruding in a direction substantially orthogonal to the surface of the diaphragm 4. Since the step portion 43 is formed at the boundary between the high density portion 41 and the low density portion 42, the density, rigidity, Young's modulus, etc. are different between the low density portion 42 and the high density portion 41, and the divided vibration Unnecessary vibration such as can be reduced.
  • the speaker diaphragm 4 has a characteristic that the high frequency peak of the frequency characteristic due to the divided vibration appears on the higher frequency side than the audible range, and the reproduced sound has a relatively high quality. .
  • the high density portion 41 of the diaphragm 4 is formed in a shape protruding in a direction perpendicular to the surface of the diaphragm as compared with the flat low density portion 42, and the diameter extends from the inner peripheral portion to the outer peripheral portion. Since it is formed in a shape such as an ellipse along the direction, it is possible to radiate reproduced sound having directivity in a predetermined direction.
  • the diaphragm 4 has different rigidity between the high density portion 41 and the low density portion 42, the density of the dense waves differs between the high density portion 41 and the low density portion 42, and a step portion 43 is formed at the boundary portion. Therefore, since the dip of the frequency characteristic of the entire diaphragm is relatively reduced and flattened, the reproduced sound has high sound quality.
  • the present invention is not limited to the embodiment described above.
  • the single raw material which consists of fibers such as a wood pulp
  • it is not restricted to this form.
  • chemical fibers such as Kevlar fibers and inorganic fibers such as carbon fibers and glass fibers.
  • a large density difference can be provided between the high density portion 41 and the low density portion 42 by adjusting the diameter and depth of the net, the paper making time, and the like.
  • the high density part 41 and the low density part 42 were provided in the diaphragm, it is not restricted to this form, for example, the high density part 41 and the low density part 42 of the component which concerns on this invention in a center cap, May be provided.

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  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

L'invention concerne une structure relativement simple permettant de réduire l'oscillation inutile telle que la résonance partagée, de réduire les pics et les creux dans la réponse de fréquence provoqués par la résonance partagée ou similaire, etc. Un diaphragme (4) d'un dispositif de haut-parleur (10) comprend une partie haute densité (41) et une partie basse densité (42). La partie haute densité (41) est formée de sorte à avoir une forme en saillie dans une direction presque orthogonale par rapport à la surface du diaphragme (4). La partie haute densité est entourée par une partie étage (43) formée à une limite entre la partie haute densité (41) et la partie basse densité (42).
PCT/JP2008/053661 2008-01-17 2008-02-29 Diaphragme pour haut-parleur et dispositif de haut-parleur WO2009090761A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2008801240791A CN101919268A (zh) 2008-01-17 2008-02-29 扬声器用振动板及扬声器装置
JP2009549949A JPWO2009090761A1 (ja) 2008-01-17 2008-02-29 スピーカ用振動板、およびスピーカ装置

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JPPCT/JP2008/050549 2008-01-17
PCT/JP2008/050549 WO2009090746A1 (fr) 2008-01-17 2008-01-17 Diaphragme pour haut-parleur et dispositif de haut-parleur

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2014162411A1 (fr) * 2013-04-01 2014-10-09 パイオニア株式会社 Membrane pour dispositif de haut-parleur
WO2021247519A1 (fr) * 2020-06-03 2021-12-09 Acoustic Metamaterials LLC Diaphragme de haut-parleur en métamatériau

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102118672A (zh) * 2011-03-28 2011-07-06 苏州上声电子有限公司 扬声器振动膜片及扬声器
CN102340725A (zh) * 2011-07-28 2012-02-01 苏州上声电子有限公司 扬声器振动膜片及扬声器
GB2534859B (en) * 2015-01-30 2020-06-10 B&W Group Ltd Diaphragm for a loudspeaker drive unit or a microphone
WO2022217226A1 (fr) * 2021-04-06 2022-10-13 Sonos, Inc. Membrane à rigidité variable pour un dispositif de lecture

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WO2009090746A1 (fr) 2009-07-23
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