WO2009090761A1 - Diaphragm for speaker, and speaker device - Google Patents

Diaphragm for speaker, and speaker device 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
Other languages
French (fr)
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 JP2009549949A priority Critical patent/JPWO2009090761A1/en
Priority to CN2008801240791A priority patent/CN101919268A/en
Publication of WO2009090761A1 publication Critical patent/WO2009090761A1/en

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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.

Abstract

A relatively simple structure enables reduction in unnecessary oscillation such as split resonance, reduction in peaks and dips in frequency response caused by the split resonance or the like, and so on. A diaphragm (4) of a speaker device (10) comprises a high-density portion (41) and a low-density portion (42). The high-density portion (41) is formed to have a shape projecting in a direction almost orthogonal to the surface of the diaphragm (4). The high-density portion is surrounded by a step portion (43) formed at a boundary between the high-density portion (41) and the low-density portion (42).

Description

スピーカ用振動板、およびスピーカ装置Speaker diaphragm and speaker device
　本発明は、スピーカ用振動板、およびスピーカ装置に関する。 The present invention relates to a speaker diaphragm and a speaker device.
　スピーカ用振動板は、軽量で厚みが薄いものが高能率である。しかし、振動板の厚みが比較的薄い場合、分割共振により再生音の歪みが大きくなる。
　例えば、パルプを主体とした紙を素材とし、全面ほぼ均一な厚みに成形されており、部分的に堆積秤量が異なるように形成されたスピーカ用振動板が知られている（例えば、特許文献１参照）。上記スピーカ用振動板では、高密度部により振動板を補強している。 A speaker diaphragm that is lightweight and thin is highly efficient. However, when the diaphragm is relatively thin, the distortion of the reproduced sound increases due to the division resonance.
For example, there is known 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). In the speaker diaphragm, the diaphragm is reinforced by the high density portion.
特公平６－８１３５３号公報（第１図）Japanese Patent Publication No. 6-81353 (Fig. 1)
　しかし、上記スピーカ用振動板は、振動板の周方向に沿って、低密度領域、中密度部、高密度領域と段階的に密度が異なるように形成され、振動板の厚みがほぼ均一になるように形成されており、この構成では分割共振を十分に低減することができない場合がある。このため、分割共振等の不要な振動を、より低減することができる振動板が望まれている。
　また、上記スピーカ用振動板では、分割共振等による周波数特性に現れるピーク・ディップを十分に低減することが困難である。 However, 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. In this configuration, there is a case where the divided resonance cannot be sufficiently reduced. For this reason, a diaphragm capable of further reducing unnecessary vibration such as split resonance is desired.
In the speaker diaphragm, it is difficult to sufficiently reduce the peak dip appearing in the frequency characteristics due to division resonance or the like.
　ところで、スピーカ装置は様々な環境で用いられており、例えば所定方向に指向性のある再生音を放射することが望まれている場合がある。 By the way, 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.
　本発明は、このような問題に対処することを課題の一例とするものである。すなわち、比較的簡単な構造で、分割共振などの不要な振動を低減すること、分割共振等による周波数特性に現れるピーク・ディップを低減すること、比較的簡単な構造で所定方向に指向性のある再生音を放射すること、等が本発明の目的である。 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.
　このような目的を達成するために、本発明は、以下の独立請求項に係る構成を少なくとも具備するものである。
　本発明に係るスピーカ用振動板は、高密度部と低密度部とを備え、前記高密度部は、振動板の面に略直交する方向に突起した形状に形成され、該高密度部と前記低密度部との境界に形成された段部によって囲まれていることを特徴とする。
　また、本発明に係るスピーカ装置は、高密度部と低密度部とを備えたスピーカ用振動板を有し、前記高密度部は、振動板の面に略直交する方向に突起した形状に形成され、該高密度部と前記低密度部との境界に形成された段部によって囲まれていることを特徴とする。 In order to achieve such an object, the present invention includes at least a configuration according to the following independent claims.
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.
本発明の一実施形態に係るスピーカ用振動板を採用したスピーカ装置を説明するための図であり、詳細には（Ａ）はスピーカ装置および振動板の半断面図であり、（Ｂ）は（Ａ）に示した振動板の高密度部および低密度部付近を拡大した図であり、（Ｃ），（Ｄ）は（Ａ）に示した振動板の変形例を示す図である。It is a figure for demonstrating the speaker apparatus which employ | adopted the diaphragm for speakers which concerns on one Embodiment of this invention, in detail (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), (D) is a figure which shows the modification of the diaphragm shown to (A). 本発明の一実施形態に係るスピーカ用振動板を説明するための図であり、詳細には、（Ａ）はスピーカ用振動板の斜視図であり、（Ｂ）は（Ａ）に示した振動板のＡ－Ｂ線またはＣ－Ｄ線での密度（ρ）を示す図であり、（Ｃ）は（Ａ）に示した振動板のＡ－Ｂ線またはＣ－Ｄ線での厚み（ｔ）を示す図である。It is a figure for demonstrating the diaphragm for speakers concerning one embodiment of the present invention, and in detail, (A) is a perspective view of a diaphragm for speakers, and (B) is a vibration shown in (A). FIG. 7 is a diagram showing the density (ρ) 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）～（Ｆ）は本発明の第１具体例に係るスピーカ用振動板の製造方法を説明するための図である。(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）は本発明の第２具体例に係るスピーカ用振動板の製造方法を説明するための図である。(A)-(F) is a figure for demonstrating the manufacturing method of the diaphragm for speakers concerning the 2nd specific example of this invention. （Ａ）～（Ｆ）は本発明の第３具体例に係るスピーカ用振動板の製造方法を説明するための図である。(A) to (F) are views for explaining a method of manufacturing a speaker diaphragm according to a third specific example of the present invention. （Ａ），（Ｂ）は本発明の一具体例に係るスピーカ用振動板の製造方法の乾燥方法を説明するための図である。(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）～（Ｅ）は本発明の他の実施形態に係るスピーカ用振動板を説明するための図である。(A) to (E) are views for explaining a speaker diaphragm according to another embodiment of the present invention. 本発明の他の実施形態に係るスピーカ用振動板を説明するための図であり、（Ａ）は本発明の他の実施形態に係る振動板のＡ－Ｂ線またはＣ－Ｄ線での面密度（Ｓ）を示す図であり、（Ｂ）は振動板のＡ－Ｂ線またはＣ－Ｄ線での密度（ρ）を示す図であり、（Ｃ）は振動板のＡ－Ｂ線またはＣ－Ｄ線での厚み（ｔ）を示す図である。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. 7 is a diagram showing the density (S), (B) is a diagram showing the density (ρ) at the AB line or CD line of the diaphragm, and (C) is the AB line of the diaphragm or It is a figure which shows the thickness (t) in CD line. （Ａ）は比較例に係る抄紙振動板を採用したスピーカ装置（ＪＪ）の音響周波数特性を説明するための図であり、（Ｂ）は本発明の実施形態に係る振動板を採用したスピーカ装置（ＰＰ）の音響周波数特性を説明するための図である。(A) is a figure for demonstrating the acoustic frequency characteristic of the speaker apparatus (JJ) which employ | adopted the papermaking diaphragm which concerns on a comparative example, (B) is the speaker apparatus which employ | adopted the diaphragm which concerns on embodiment of this invention. It is a figure for demonstrating the acoustic frequency characteristic of (PP).
　本発明の一実施形態に係るスピーカ用振動板は、高密度部と低密度部とを備え、高密度部は、振動板の面に略直交する方向に突起した形状に形成され、該高密度部と低密度部との境界に形成された段部によって囲まれていることを特徴とする。
　上記スピーカ用振動板は、例えば低密度部と高密度部とが形成され、高密度部が振動板の面に略直交する方向に突起した形状に形成されており、高密度部が、該高密度部と低密度部との境界に形成された段部によって囲まれているので、低密度部と高密度部それぞれで密度，剛性，ヤング率などが異なり、分割振動などの不要な振動を低減することができる。詳細には、高密度部が、該高密度部と低密度部との境界に形成された段部によって囲まれた所定形状のエリア内に形成されているので、所望の音響特性の音を発することができる。 A speaker diaphragm according to an embodiment of 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 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. Since it is surrounded by a step formed at the boundary between the density part and the low density part, 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. Specifically, since 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.
　詳細には、例えば振動板の周方向に沿って、低密度領域、中密度部、高密度領域と段階的に密度が異なるように形成され、振動板の厚みがほぼ均一になるように形成された一般的な振動板と比較して、本発明に係るスピーカ用振動板は、高密度部と低密度部との境界に立体的な段部が形成されて、高密度部が低密度部に対して突出した形状に形成されており、高密度部が段部により囲まれているので、低密度部と高密度部とで剛性が明確に異なり、分割共振などの不要な振動をより低減することができる。 Specifically, for example, along the circumferential direction of the diaphragm, 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. Compared with a general diaphragm, 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.
　また、上述したように本発明に係るスピーカ用振動板では、上記分割共振などの不要な振動を低減することができるので、そのスピーカ用振動板を採用したスピーカ装置は、再生音の周波数特性に現れるピーク・ディップを低減することができる。
　また、一般的な振動板では、分割振動などにより周波数特性に見られる高域共振周波数でピークが現れるが、一方、本発明に係るスピーカ用振動板では、そのピークが可聴域より高周波数側に現れるという特性があり、再生音が比較的高音質である。 Further, as described above, in the speaker diaphragm according to the present invention, unnecessary vibration such as the above-described split resonance can be reduced. Therefore, the speaker device employing the speaker diaphragm has frequency characteristics of reproduced sound. The appearing peak dip can be reduced.
In general diaphragms, 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.
　以下、図面を参照しながら、本発明の一実施形態に係るスピーカ用振動板、およびスピーカ装置を説明する。 Hereinafter, a speaker diaphragm and a speaker device according to an embodiment of the present invention will be described with reference to the drawings.
　図１は、本発明の一実施形態に係るスピーカ用振動板を採用したスピーカ装置を説明するための図である。詳細には、図１（Ａ）はスピーカ装置および振動板の半断面図であり、図１（Ｂ）は図１（Ａ）に示した振動板の高密度部および低密度部付近を拡大した図である。
　図２は、本発明の一実施形態に係るスピーカ用振動板を説明するための図である。詳細には図２（Ａ）はスピーカ用振動板の斜視図であり、図２（Ｂ）は図２（Ａ）に示した振動板のＡ－Ｂ線またはＣ－Ｄ線での密度（ρ）を示す図であり、図２（Ｃ）は図２（Ａ）に示した振動板のＡ－Ｂ線またはＣ－Ｄ線での厚み（ｔ）を示す図である。 FIG. 1 is a diagram for explaining a speaker device employing a speaker diaphragm according to an embodiment of the present invention. Specifically, FIG. 1A is a half sectional view of the speaker device and the diaphragm, and 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.
FIG. 2 is a diagram for explaining a speaker diaphragm according to an embodiment of the present invention. Specifically, FIG. 2A is a perspective view of a speaker diaphragm, and FIG. 2B is a density (ρ) of an AB line or a CD line of the diaphragm shown in FIG. 2C is a diagram showing the thickness (t) of the diaphragm shown in FIG. 2A taken along the line AB or CD.
　本実施形態に係るスピーカ用振動板４を採用したスピーカ装置１０は、図１（Ａ）に示すように、例えば磁石１Ａ，プレート１Ｂ，ヨーク１Ｃにより構成される磁気回路１と、磁気回路１の磁気ギャップ内に配置され、ボイスコイルボビン２に巻回されたボイスコイル３と、中心部がボイスコイルボビン２に接合されたスピーカ用振動板４を有する。スピーカ用振動板４（以下、振動板４と呼称）は、外周縁部がエッジ５およびガスケット６により、スピーカフレーム７に振動自在に固定されている。ボイスコイルボビン２は、ダンパ８を介してスピーカフレーム７に固定されている。ボイスコイルボビン２の開口部は、センターキャップ９により覆われている。 As shown in FIG. 1A, 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.
　上記構成のスピーカ装置１０では、磁気回路１の磁気ギャップ中に配置されたボイスコイル３に音声信号が入力されると、ボイスコイル３にローレンツ力（駆動力）が生じ、その駆動力がボイスコイルボビン２を介して振動板４に伝達され、振動板４が振動する。 In the speaker device 10 configured as described above, when an audio signal is input to the voice coil 3 disposed in the magnetic gap of the magnetic circuit 1, a Lorentz force (driving force) is generated in the voice coil 3, and the driving force is the voice coil bobbin. 2 is transmitted to the diaphragm 4 via 2, and the diaphragm 4 vibrates.
　振動板４は、例えば、コーン形状、平板形状、円形状などの規定形状に形成されている。本実施形態に係る振動板４は、コーン形状に形成されている。 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.
　振動板４の形成材料としては、繊維、樹脂、セラミックス、金属などが挙げられる。本実施形態に係る振動板４の形成材料としては、繊維４０を採用する。繊維としては、例えば、木材パルプ繊維、非木材パルプ繊維、化学繊維、合成繊維、動物繊維、植物繊維、有機繊維、無機繊維、ガラス繊維、炭素繊維、セラミック繊維などが挙げられる。 The forming material of the diaphragm 4 includes fibers, resins, ceramics, metals, and the like. As a material for forming the diaphragm 4 according to the present embodiment, fibers 40 are employed. Examples of 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.
　図１～図２に示すように、本実施形態に係る振動板４は、高密度部４１、低密度部４２、段部４３、内周部４５、外周部４６、および外周段部（段部）４８を有する。
　高密度部４１は本発明に係る高密度部の一実施形態に相当する。低密度部４２は本発明に係る低密度部の一実施形態に相当する。段部４３は本発明に係る段部の一実施形態に相当する。 As shown in FIGS. 1 and 2, the diaphragm 4 according to the present embodiment 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.
　振動板４の胴体部には、高密度部４１、および略平坦な低密度部４２が形成されている。本実施形態では、胴体部に複数の高密度部４１が形成されている。以下、高密度部４１および低密度部４２について詳細に説明する。 A high density portion 41 and a substantially flat low density portion 42 are formed on the body portion of the diaphragm 4. In the present embodiment, a plurality of high density portions 41 are formed in the body portion. Hereinafter, the high density part 41 and the low density part 42 will be described in detail.
　高密度部４１は、低密度部４２と比べて、振動板の形成材料によって高い密度となるように形成されている。具体的には高密度部４１は、振動板の形成材料である繊維を他の領域（低密度部４２）より高密度に配置することで形成されている。 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).
　また、高密度部４１は、図１，２に示すように、振動板４の面に略直交する方向に突起した形状に形成されている。この高密度部４１の突起状部は、音響放射側（ＳＤ）の表面側、裏面側の両方、またはいずれか一方に形成されている。本実施形態に係る高密度部４１は、音響放射側（ＳＤ）の表面に直交する方向に突起した形状に形成されている。 Further, as shown in FIGS. 1 and 2, 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).
　詳細には、振動板４は、図１，２に示すように、高密度部４１と低密度部４２との境界に段部４３が形成されている。また、高密度部４１は、高密度部４１と低密度部４２との境界に形成された段部４３によって囲まれている。つまり高密度部４１は、振動板４全体のうち、低密度部４２との境界に形成された段部４３により囲まれたエリアに形成されている。詳細には、高密度部４１は、低密度部４２との境界部で段部４３が形成されるように、明確に突起した形状に形成されている。また、高密度部４１と低密度部４２の境界部で、密度変化率が、他の部分と比較して大きくなるように、振動板４が形成されている。
　このように、振動板４は、高密度部４１と低密度部４２とが明確に区分されており、高密度部４１が段部４３により囲まれており、高密度部４１と低密度部４２とで、密度、剛性値，ヤング率などが明確に異なるので、分割共振などの不要な振動を低減することができる。 Specifically, as shown in FIGS. 1 and 2, 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. Specifically, 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. Further, 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.
Thus, in the diaphragm 4, 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.
　また、高密度部４１は、低密度部４２より厚く形成されている。このため、高密度部４１と低密度部４２とで剛性値、ヤング率などが明確に異なるので、分割共振などの不要な振動を、より低減することができる。 Further, 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.
　また、高密度部４１は、図１，２に示すように、高密度部４１の段部４３にて囲まれる平坦部４４が設けられている。詳細には、高密度部４１の平坦部４４は、図１（Ａ）～図１（Ｄ），図２（１）に示すように、径方向に沿って厚みが均一（平坦）であり、周方向には振動板の曲面に沿って厚みが均一となるように形成されている。この平坦部４４が形成されているので、平坦部４４から発せられる音波に位相差が生じることを抑止することができる。また、この平坦部４４が形成されているので、高密度部４１と低密度部４２から発せられる音波との間に大きな位相差が生じることを抑止することができ、高音質の再生音を提供することができる。さらに振動板４２の表面側において、段部４３の段部（厚み：大きさ）を、例えばスピーカ用エッジ５の厚みよりも小さくすることで、段部４３による音波の位相差を比較的小さくでき、高音質の再生音を提供することができる。 Further, as shown in FIGS. 1 and 2, the high density portion 41 is provided with a flat portion 44 surrounded by a stepped portion 43 of the high density portion 41. Specifically, 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. In addition, since 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.
　また、高密度部４１は、段部４３により囲まれているエリアが平坦に形成されている形態に限られるものではない。例えば、高密度部４１は、段部４３により囲まれているエリアが音響放射方向に凸形状、凹形状、波型形状などの曲面形状に形成されていてもよく、この形状の高密度部４１は、より高い剛性を有する。 Further, the high density portion 41 is not limited to the form in which the area surrounded by the step portion 43 is formed flat. For example, 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.
　また、図１（Ｃ），図１（Ｄ）に示されるように、段部４３の段差（厚み）がエッジ５の厚みよりも小さく、又は低密度部４２の厚みよりも小さく形成されていてもよく、この構成の振動板を採用したスピーカ装置では、振動板やエッジを含む振動体全体から発せられる音波間の位相差を比較的小さくすることができ、高音質の再生音を提供することができる。 Further, as shown in FIGS. 1C and 1D, 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. In the speaker device employing the diaphragm having this configuration, 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.
　次に、振動板４の密度ρ（g/cm3 ）と、厚みｔ（ｍｍ）について説明する。
　図２（Ａ），２（Ｂ）に示すように、本実施形態に係る振動板４は、低密度部４２の密度ρ４２より、高密度部４１の密度ρ４１が高くなるように形成されている。また、図２（Ａ），２（Ｃ）に示すように、本実施形態に係る振動板４は、低密度部４２の厚みｔ４２より、高密度部４１の厚みｔ４１が厚くなるように形成されている。 Next, the density ρ (g / cm 3 ) and the thickness t (mm) of the diaphragm 4 will be described.
As shown in FIGS. 2A and 2B, the diaphragm 4 according to the present embodiment is formed such that the density ρ41 of the high-density portion 41 is higher than the density ρ42 of the low-density portion 42. . 2A and 2C, 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.
　本願発明者は、例えば原料として、ＮＵＫＰ（針葉樹未晒しクラフトパルプ）に叩解を施し、叩解度２０°ＳＲ（ショッパーリグラー）に調整した紙料を用いて、抄造方法により、口径φ60mmの振動板４を作製した。その振動板４の低密度部４２は、面厚が0.22mm、密度が0.626g/cm3 、ヤング率が2.45×1010 dyne/cm2 であり、高密度部４１は、面厚が0.260mm、密度が0.727g/cm3 、ヤング率が2.99×1010 dyne/cm2である。 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 , and 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 .
　また、本実施形態に係る高密度部４１は、振動板４の内周部４５から外周部４６にかけて径方向に沿って延在して形成されている。また、本実施形態に係る高密度部４１は、例えば平面形状が楕円形状、矩形状、などの規定形状に形成されており、振動板４に放射状に複数形成されている。本実施形態では、振動板４は、４つの楕円形状の高密度部４１が放射状に形成されている。
　上述した高密度部４１が形成された振動板４は、振動板全体が高剛性を有するので、分割共振などの不要な振動を抑止することができる。 Further, 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.
　また、本実施形態に係る振動板４は、図２（Ａ）に示すように、外周部４６に、周方向に沿って外周段部４８が形成されている。この外周段部４８を振動板４に形成することで、振動板４の撓みなどを抑止することができる。本実施形態では、この外周段部４８は、スピ―カ用エッジ５の取り付け部となる。また、必要に応じ、外周段部４８を切断等し後に、スピーカ用エッジ５を取り付けても構わない。 Moreover, as shown in FIG. 2A, the diaphragm 4 according to this embodiment has an outer peripheral step portion 48 formed in the outer peripheral portion 46 along the circumferential direction. By forming the outer peripheral step portion 48 on the diaphragm 4, it is possible to suppress the bending of the diaphragm 4. In the present embodiment, 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.
　［製造方法］
　次に、本発明の一実施形態に係る振動板４の製造方法を、図面を参照しながら説明する。 [Production method]
Next, a method for manufacturing the diaphragm 4 according to an embodiment of the present invention will be described with reference to the drawings.
　［第１具体例］
　図３（Ａ）～図３（Ｆ）は、本発明の第１具体例に係るスピーカ用振動板の製造方法を説明するための図である。
　本具体例に係る振動板４は、例えば木材パルプなどを主体とする原料を抄造することにより形成される。
　図３（Ａ），３（Ｂ）に示すように、先ず、製造装置２０の抄造タンク２０１内に、振動板４の形状に対応した形状に形成された金網２２を配置する。そして、抄造タンク２０１内に、例えば振動板４の原材料である繊維４０と水などが混合された液４０１を投入して、抄造タンク２０１の金網２２の下部側をポンプで減圧しながら、抄造を行う。
　次に、図３（Ｃ），３（Ｄ）に示すように、高密度部４１に対応する位置に孔部２３１が形成された金型２３を、上記抄造が行われた金網２２上に配置して、再度抄造を行う。
　そして、図３（Ｅ），３（Ｆ）に示すように、抄造後、金型２３を取り除き、金網２２を引き上げて、振動板４を取り出す。その振動板４を乾燥させる。
　上記振動板の製造方法では、孔部２３１が形成された金型２３を用いて抄造を行うことにより、高密度部４１と低密度部４２が形成された振動板４を簡単に作製することができる。 [First example]
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.
As shown in FIGS. 3A and 3B, 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. Then, 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. Do.
Next, as shown in FIGS. 3 (C) and 3 (D), 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. Then, paper making is performed again.
Then, as shown in 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.
In the manufacturing method of the diaphragm, by making a paper using the mold 23 in which the hole 231 is formed, the diaphragm 4 in which the high density portion 41 and the low density portion 42 are formed can be easily manufactured. it can.
　［第２具体例］
　図４（Ａ）～図４（Ｆ）は、本発明の第２具体例に係るスピーカ用振動板の製造方法を説明するための図である。
　図４（Ａ），４（Ｂ）に示すように、本具体例に係る振動板４の製造方法では、先ず、製造装置２０の抄造タンク２０１内に金網２２を配置し、その金網２２の上部に、孔部２３１が形成された金型２３を配置する。そして、抄造タンク２０１内に、振動板４の原材料である繊維４０と水などが混合された液４０１を投入して、抄造タンク２０１の金網２２の下部側をポンプで減圧しながら、抄造を行う。金網２２上には振動板４の高密度部４１に対応する部分が形成される。
　次に、図４（Ｃ），４（Ｄ）に示すように、金型２３を取り除いた後、再度抄造を行う。
　そして、図４（Ｅ），４（Ｆ）に示すように、抄造後、金型２３を取り除き、金網２２を引き上げて、振動板４を取り出す。それの振動板４を乾燥させる。
　上記振動板の製造方法では、孔部２３１が形成された金型２３を用いて抄造を行うことにより、先ず、高密度部４１に対応する部分を形成した後、再度、抄造を行うことにより、より簡単に本発明に係る振動板４を簡単に作製することができる。 [Second specific example]
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.
As shown in FIGS. 4 (A) and 4 (B), in the method of manufacturing the diaphragm 4 according to this specific example, first, 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. Then, 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.
Next, as shown in FIGS. 4C and 4D, after the mold 23 is removed, papermaking is performed again.
Then, as shown in 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.
In the manufacturing method of the diaphragm, by making paper using the mold 23 in which the hole 231 is formed, first, after forming a portion corresponding to the high density portion 41, by making paper again, The diaphragm 4 according to the present invention can be easily produced.
　［第３具体例］
　図５（Ａ）～図５（Ｈ）は、本発明の第３具体例に係るスピーカ用振動板の製造方法を説明するための図である。
　本具体例に係る振動板の製造方法では３回の抄造工程を行うことにより、振動板４の高密度部４１が３層構造を有する。
　具体的には、図５（Ａ），５（Ｂ）に示すように、先ず、製造装置２０の抄造タンク２０１内に、振動板４の形状に対応した形状に形成された金網２２を配置する。そして、抄造タンク２０１内に、例えば振動板４の原材料である繊維４０と水などが混合された液４０１を投入して、抄造タンク２０１の金網２２の下部側をポンプで減圧しながら、抄造を行う。
　次に、図５（Ｃ），５（Ｄ）に示すように、高密度部４１に対応する位置に孔部２３１が形成された金型２３を、上記抄造が行われた金網２２上に配置して、再度抄造を行う。金網２２上には振動板４の高密度部４１に対応する部分が形成される。
　次に、図５（Ｅ），５（Ｆ）に示すように、金型２３を取り除いた後、再度抄造を行う。
　そして、図５（Ｇ），５（Ｈ）に示すように、抄造後、金型２３を取り除き、金網２２を引き上げて、振動板４を取り出す。その振動板４を乾燥させる。
　上記振動板の製造方法では、３回の抄造工程を行うことにより、振動板４の高密度部４１が３層構造を有する。このため振動板４は、３層構造の高剛性の高密度部４１と低密度部４２とが形成されるとともに、振動板全体が高剛性となる。このように、高密度部４１は、異なる密度の複数の層から形成されていてもよい。 [Third example]
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.
In the manufacturing method of the diaphragm according to this example, 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. . Then, 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. Do.
Next, as shown in FIGS. 5C and 5D, 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. Then, 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.
Next, as shown in FIGS. 5E and 5F, after the mold 23 is removed, papermaking is performed again.
Then, as shown in FIGS. 5 (G) and 5 (H), 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.
In the method for manufacturing the diaphragm, 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. Thus, the high density part 41 may be formed from a plurality of layers having different densities.
　図６（Ａ），図６（Ｂ）は、本発明の一具体例に係るスピーカ用振動板の製造方法の乾燥方法を説明するための図である。
　次に、上記抄造により形成された振動板を乾燥する方法の一具体例を説明する。
　図６（Ａ），（Ｂ）に示すように、乾燥装置３０は、釜（オーブン）３１の上部に加熱部３２、および遮蔽板３３が配置されている。乾燥装置３０の下部には、振動板４が固定部３４により固定され、振動板４の下部側は、吸引部３５により減圧されている。
　上記乾燥装置３０では、例えば、加熱部３２からガスなどを燃焼させて、下部の吸引部３５により脱水吸引することにより、振動板４を熱風により乾燥する。上記乾燥装置３０により、高密度部４１と低密度部４２が形成された振動板４を簡単に作製することができる。
　また、熱風乾燥により、振動板の全体の密度を低密度化した上で、任意の部分のみ密度を高めることが可能である。 6 (A) and 6 (B) are views for explaining a drying method of the speaker diaphragm manufacturing method according to one specific example of the present invention.
Next, a specific example of a method for drying the diaphragm formed by the papermaking will be described.
As shown in FIGS. 6A and 6B, in the drying device 30, 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.
In 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. With the drying device 30, the diaphragm 4 in which the high density portion 41 and the low density portion 42 are formed can be easily produced.
In addition, it is possible to increase the density of only an arbitrary portion after reducing the density of the entire diaphragm by hot air drying.
　また、上記製造方法では、抄造後、熱風乾燥を行ったが、この形態に限られるものではなく、例えば抄造後、その振動板にプレス処理を施すことにより本発明に係るスピーカ用振動板を作製してもよい。 Further, in the above manufacturing method, hot air drying was performed after paper making, but the present invention is not limited to this form. For example, after making paper, the diaphragm for the speaker according to the present invention is manufactured by pressing the diaphragm. May be.
　［他の実施形態］
　図７（Ａ）～（Ｅ）は、本発明の他の実施形態に係るスピーカ用振動板を説明するための図である。上記実施形態と同じ構成については説明を省略する。
　振動板４Ｂは、図７（Ａ）に示すように、高密度部４１Ｂの裏面側に凹部が形成されていてもよい。詳細には、振動板４Ｂは、高密度部４１Ｂの突起状部が形成された面に対向する面側に、凹部が形成されている。この高密度部４１Ｂの凹部と低密度部４２の境界部には、段部４３が形成されている。 [Other Embodiments]
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.
As shown in FIG. 7A, 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.
　振動板４Ｃは、図７（Ｂ）に示すように、高密度部４１Ｃの裏面側にも凸部（突起部）が形成されていてもよい。詳細には、振動板４Ｃは、高密度部４１Ｃの突起状部が形成された面に対向する面側に、凸部が形成されている。この高密度部４１Ｂの凸部と低密度部４２の境界部には、段部４３が形成されている。 As shown in FIG. 7B, the vibration plate 4C may have a convex portion (projection) on the back surface side of the high density portion 41C. Specifically, the vibration plate 4C has a convex portion formed on the surface side facing the surface on which the protruding portions of the high density portion 41C are formed. A stepped portion 43 is formed at the boundary between the convex portion of the high density portion 41B and the low density portion.
　振動板４Ｄは、図７（Ｃ）に示すように、音響放射方向（ＳＤ）の表面側は、高密度部４１Ｄと低密度部４２との境界部が平坦で、高密度部４１Ｄの裏面側に凸部（突起部）が形成されている。この高密度部４１Ｄの凸部と低密度部４２の境界部には、段部４３が形成されている。 As shown in FIG. 7C, 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.
　振動板４Ｅは、図７（Ｄ）に示すように、椀形状に形成されており、振動板４の底部に高密度部４１Ｅが形成され、その他の部分には低密度部４２Ｅが形成されている。振動板の底部に高密度部４１Ｅが形成されているので、振動板４が高剛性を有する。 As shown in FIG. 7D, 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.
　また、振動板４Ｆは、図７（Ｅ）に示すように、振動板４に環状に高密度部４１Ｆが形成され、それ以外の部分に低密度部４２Ｆが形成されている。詳細には、高密度部４１Ｆは、周方向に沿って形成されている。この構成の振動板４Ｆでは、分割振動をより低減することができる。 Further, as shown in FIG. 7E, 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.
　図８（Ａ）は本発明の他の実施形態に係るスピーカ用振動板４Ｇの面密度（Ｓ（g/cm2 ））を説明するための図であり、図８（Ｂ）は振動板４Ｇの密度（体積密度ρ（g/cm3 ））を説明するための図であり、図８（Ｃ）は振動板４Ｇの厚みｔ（ｍｍ）を説明するための図である。スピーカ用振動板４Ｇは図２（Ａ）に示される振動板４と略同様であり図示及び説明を省略する。また、上記実施形態と同じ構成については説明を省略する。 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, and FIG. 8B is a diagram of the diaphragm 4G. Is a diagram for explaining the density (volume density ρ (g / cm 3 )), and 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.
　図８（Ａ）に示すように、本実施形態に係る振動板４Ｇは、低密度部の面密度４２の面密度Ｓ４２より、高密度部４１の面密度Ｓ４１が高くなるように形成されている。また、図８（Ｂ）に示すように、低密度部４２の密度ρ４２より、高密度部４１の密度ρ４１が低くなるように形成されている。また、図８（Ｃ）に示すように、本実施形態に係る振動板４Ｇは、低密度部４２の厚みｔ４２より、高密度部４１の厚みｔ４１が厚くなるように形成されている。 As shown in FIG. 8A, 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. . Further, as shown in FIG. 8B, the density ρ41 of the high-density portion 41 is formed to be lower than the density ρ42 of the low-density portion 42. As shown in FIG. 8C, 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.
　スピーカ用振動板４Ｇは、例えば上記第３具体例に係るスピーカ用振動板の製造方法と略同様の製造方法により作製することができる。詳細には、例えば、抄造後にスピーカ用振動板４Ｇの低密度部４２のみプレス処理を施すことにより、振動板４Ｇの高密度部４１の面密度を低密度部４２の面密度よりも大きく、高密度部４１の密度を低密度部４２の密度よりも小さく形成することができる。また上記プレス処理を調整し、高密度部４１の密度を低密度部４２の密度と略同じにしても構わない。また高密度部４１の密度が低密度部４２の密度に対し略同じ又は小さくなるよう、プレス処理を低密度部４２及び高密度部４１にも施しても構わない。
　上述したようにスピーカ用振動板４Ｇは、高密度部４１の面密度が低密度部４２の面密度よりも大きく形成されているので、高密度部４１の剛性が比較的大きい。また、高密度部４１の密度を低密度部４２に対し略同一又は小さく形成することで、高密度部４１の内部損失を比較的大きくすることができ、分割振動等の不要な振動を低減することができる。 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. In addition, 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.
As described above, 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. Further, by forming the density of the high-density portion 41 substantially the same or smaller than that of the low-density portion 42, 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.
　［実施例］
　図９（Ａ）は比較例に係る抄紙振動板を採用したスピーカ装置（ＪＪ）の音響周波数特性を説明するための図であり、図９（Ｂ）は本発明の実施形態に係る振動板を採用したスピーカ装置（ＰＰ）の音響周波数特性を説明するための図である。横軸は周波数（Ｈｚ）を示し、縦軸は音圧（ＳＰＬ：Sound pressure level）（ｄＢ（デシベル））を示す。 [Example]
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, and 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 | adopted speaker apparatus (PP). The horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure (SPL: Sound pressure level) (dB (decibel)).
　本発明に係る振動板の効果を確認するため、一般的な抄紙による比較例の振動板、詳細には高密度部および低密度部がなく均一な厚みおよび均一な密度の振動板を採用したスピーカ装置（ＪＪ）の音響特性、および図１（Ａ），図１（Ｂ）に示した本発明の実施形態に係る振動板を採用したスピーカ装置（ＰＰ）の音響特性を測定した。
　上記測定の結果、図９（Ａ），図９（Ｂ）に示すように、本発明に係る振動板では、高密度部が比較的高いヤング率を有し、振動板全体の剛性が比較的高いので、本発明に係る振動板を採用したスピーカ装置によれば、特に中音域で、高音質の再生を行うことができる。
　また、図９（Ａ），図９（Ｂ）に示すように、本発明に係る振動板を採用したスピーカ装置（ＰＰ）によれば、２ｋＨｚ付近での周波数特性が比較的平坦化されており、この周波数領域で、高音質の再生を行うことができる。
　また、図９（Ａ），図９（Ｂ）に示すように、本発明に係る振動板を採用したスピーカ装置（ＰＰ）によれば、低音域から中音域（約３００～１ｋＨｚ）にかけて、音圧が比較例と比べて大きい、詳細には約１ｄＢ高い。
　このため、本発明に係る振動板を採用したスピーカ装置（ＰＰ）は、比較的高音圧で高音質の再生を行うことができる。 In order to confirm the effect of the diaphragm according to the present invention, 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. 9A and 9B, in the diaphragm according to the present invention, 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. 9A and 9B, according to 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.
　以上、説明したように、本発明に係る振動板４は、高密度部４１と低密度部４２とを備え、高密度部４１は、振動板４の面に略直交する方向に突起した形状に形成され、該高密度部４１と低密度部４２との境界に段部４３が形成されているので、低密度部４２と高密度部４１それぞれで密度，剛性，ヤング率などが異なり、分割振動などの不要な振動を低減することができる。 As described above, 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.
　また、上述したように本発明に係る振動板４では、上記分割共振などの不要な振動を低減することができるので、そのスピーカ用振動板を採用したスピーカ装置は、再生音の周波数特性に現れるピーク・ディップを低減することができる。 Further, as described above, in the diaphragm 4 according to the present invention, unnecessary vibration such as the above-described split resonance can be reduced, so that the speaker device employing the speaker diaphragm appears in the frequency characteristics of reproduced sound. Peak dip can be reduced.
　また、上記本発明の一実施形態に係るスピーカ用振動板４では、分割振動などによる周波数特性の高音ピークが可聴域より高周波数側に現れるという特性があり、再生音が比較的高音質である。 Further, the speaker diaphragm 4 according to the embodiment of the present invention 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. .
　また、振動板４の高密度部４１は、平坦な形状の低密度部４２と比べて、振動板の面に直交する方向に突起した形状に形成されており、内周部から外周部にかけて径方向に沿って楕円形状などの形状に形成されているので、所定方向に指向性のある再生音を放射することができる。 Further, 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.
　また、振動板４は、高密度部４１と低密度部４２とで剛性が異なるので、高密度部４１と低密度部４２それぞれの粗密波の速度が異なり、境界部に段部４３が形成されているので、振動板全体の周波数特性のディップが比較的少なくなり、平坦化するので、再生音が高音質である。 Further, since 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.
　本発明は、上述した実施形態に限られるものではない。
　例えば、本実施形態では、例えば木材パルプ等の繊維からなる単一の原料で形成したが、この形態に限られるものではない。例えば、ケブラー繊維などの化学繊維やカーボン繊維、ガラス繊維などの無機繊維との混合抄造でも同様の効果が期待できる。また、網の径や深さ、抄造時間などを調整することにより、高密度部４１と低密度部４２とで大きな密度差を設けることができる。 The present invention is not limited to the embodiment described above.
For example, in this embodiment, although formed with the single raw material which consists of fibers, such as a wood pulp, for example, it is not restricted to this form. For example, the same effect can be expected even in mixed papermaking with chemical fibers such as Kevlar fibers and inorganic fibers such as carbon fibers and glass fibers. Moreover, 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.
　また、振動板に高密度部４１と低密度部４２とを設けたが、この形態に限られるものではなく、例えばセンターキャップに本発明に係る構成要素の高密度部４１と低密度部４２とを設けてもよい。 Moreover, although 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.

Claims (18)

  1. 　高密度部と低密度部とを備え、
    　前記高密度部は、振動板の面に略直交する方向に突起した形状に形成され、該高密度部と前記低密度部との境界に形成された段部によって囲まれていることを特徴とする
    　スピーカ用振動板。     It has a high density part and a low density part,
    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 a boundary between the high density portion and the low density portion. Yes Speaker diaphragm.
  2. 　前記高密度部は、前記段部により囲まれる平坦部を有することを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein the high-density portion has a flat portion surrounded by the stepped portion.
  3. 　前記高密度部および前記低密度部は、繊維により形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein the high-density portion and the low-density portion are formed of fibers.
  4. 　前記高密度部は、該スピーカ用振動板の内周部から外周部にかけて延在していることを特徴とする請求項１に記載のスピーカ用振動板。 2. The speaker diaphragm according to claim 1, wherein the high density portion extends from an inner peripheral portion to an outer peripheral portion of the speaker diaphragm.
  5. 　前記高密度部は、周方向に沿って形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein the high-density portion is formed along a circumferential direction.
  6. 　前記高密度部は、前記低密度部より厚く形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein the high density portion is formed thicker than the low density portion.
  7. 　前記突起した形状の高密度部が形成された面に対向する面側に、凹部が形成されていることを特徴とする請求項５に記載のスピーカ用振動板。 6. The loudspeaker diaphragm according to claim 5, wherein a concave portion is formed on a surface side facing the surface on which the high density portion having the protruding shape is formed.
  8. 　該スピーカ用振動板の外周部に周方向に沿って段部が形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein a step portion is formed along a circumferential direction on an outer peripheral portion of the speaker diaphragm.
  9. 　前記高密度部は、複数形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein a plurality of the high-density portions are formed.
  10. 　前記高密度部の突起部は表面側または裏面側に形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein the protrusions of the high-density portion are formed on the front surface side or the back surface side.
  11. 　前記高密度部の突起部は、平面形状が略楕円形状に形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 2. The loudspeaker diaphragm according to claim 1, wherein the projections of the high-density part are formed in a substantially elliptical shape in plan view.
  12. 　前記高密度部は、異なる密度の複数の層からなることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein the high-density portion includes a plurality of layers having different densities.
  13. 　前記高密度部は、３層構造を有することを特徴とする請求項１２に記載のスピーカ用振動板。 The speaker diaphragm according to claim 12, wherein the high-density portion has a three-layer structure.
  14. 　前記高密度部は、該スピーカ用振動板の底部に形成されていることを特徴とする請求項１に記載のスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein the high-density portion is formed at a bottom portion of the speaker diaphragm.
  15. 　前記段部の段差は、前記低密度部の厚みよりも小さいことを特徴とする請求項１に記載されるスピーカ用振動板。 The speaker diaphragm according to claim 1, wherein a step of the step portion is smaller than a thickness of the low density portion.
  16. 　前記高密度部の面密度が前記低密度部の面密度よりも大きく、
    　前記高密度部の密度が前記低密度部の密度に対し略同一又は小さいことを特徴とする請求項１に記載されるスピーカ用振動板。     The surface density of the high density portion is larger than the surface density of the low density portion,
    The speaker diaphragm according to claim 1, wherein a density of the high density portion is substantially the same as or smaller than a density of the low density portion.
  17. 　高密度部と低密度部とを備えたスピーカ用振動板を有し、
    　前記高密度部は、振動板の面に略直交する方向に突起した形状に形成され、該高密度部と前記低密度部との境界に形成された段部によって囲まれていることを特徴とする
    　スピーカ装置。     A speaker diaphragm having a high density portion and a low density portion,
    The high density portion is formed in a shape protruding in a direction substantially orthogonal to the surface of the diaphragm, and is surrounded by a step portion formed at a boundary between the high density portion and the low density portion. Yes Speaker device.
  18. 　振動板、エッジ、前記振動板を支持するフレームと、磁気回路とを備え、
    　前記振動板は、前記エッジを介して前記フレームに支持されており、
    　前記振動板は、高密度部と低密度部とを備え、
    　前記高密度部は、振動板の面に略直交する方向に突起した形状に形成され、該高密度部と前記段部にて囲まれる平坦部が形成されており、
    　前記段部の段差が、前記エッジの厚みよりも小さいことを特徴とする
    　請求項１７に記載されるスピーカ装置。     A diaphragm, an edge, a frame that supports the diaphragm, and a magnetic circuit;
    The diaphragm is supported by the frame via the edge,
    The diaphragm includes a high density portion and a low density portion,
    The high density portion is formed in a shape protruding in a direction substantially orthogonal to the surface of the diaphragm, and a flat portion surrounded by the high density portion and the step portion is formed,
    The speaker device according to claim 17, wherein a step of the step portion is smaller than a thickness of the edge.
PCT/JP2008/053661 2008-01-17 2008-02-29 Diaphragm for speaker, and speaker device WO2009090761A1 (en)

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WO2014162411A1 (en) * 2013-04-01 2014-10-09 パイオニア株式会社 Diaphragm for speaker device
WO2021247519A1 (en) * 2020-06-03 2021-12-09 Acoustic Metamaterials LLC Metamaterial loudspeaker diaphragm

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* Cited by examiner, † Cited by third party
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CN102118672A (en) * 2011-03-28 2011-07-06 苏州上声电子有限公司 Speaker vibrating diaphragm and speaker
CN102340725A (en) * 2011-07-28 2012-02-01 苏州上声电子有限公司 Loudspeaker and vibrating diaphragm thereof
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WO2009090746A1 (en) 2009-07-23
CN101919268A (en) 2010-12-15

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