WO2008072332A1 - Haut-parleur et son circuit magnétique - Google Patents

Haut-parleur et son circuit magnétique Download PDF

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Publication number
WO2008072332A1
WO2008072332A1 PCT/JP2006/324964 JP2006324964W WO2008072332A1 WO 2008072332 A1 WO2008072332 A1 WO 2008072332A1 JP 2006324964 W JP2006324964 W JP 2006324964W WO 2008072332 A1 WO2008072332 A1 WO 2008072332A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnet
magnetic
speaker
magnetic circuit
inner magnet
Prior art date
Application number
PCT/JP2006/324964
Other languages
English (en)
Japanese (ja)
Inventor
Kenya Watanabe
Masanori Ito
Shoichi Toyoda
Original Assignee
Pioneer Corporation
Tohoku Pioneer Corporation
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, Tohoku Pioneer Corporation filed Critical Pioneer Corporation
Priority to PCT/JP2006/324964 priority Critical patent/WO2008072332A1/fr
Publication of WO2008072332A1 publication Critical patent/WO2008072332A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers

Definitions

  • the present invention relates to a speaker magnetic circuit and a speaker.
  • a speaker is generally an electromagnetic force (Lorentzian force) generated by a magnetic circuit having a magnetic gap in which a magnetic field in a certain direction is formed and a magnetic flux acting on an audio current transmitted through a voice coil arranged in the magnetic gap.
  • the basic structure includes a vibrating body driven by force), a magnetic circuit, and a frame that supports the vibrating body.
  • the vibrating body includes a diaphragm, a voice coil bobbin, and a voice coil.
  • a magnetic circuit in which a permanent magnet is arranged inside the magnetic gap is called an inner magnet type magnetic circuit, and a circuit in which a permanent magnet is arranged outside the magnetic gap is called an outer magnet type magnetic circuit.
  • FIG. 1 is an explanatory view showing a conventional technology of a magnetic circuit in which permanent magnets are arranged on both the inside and outside.
  • the magnetic circuit J is in close contact with one surface of the cylindrical outer magnet Jl, the cylindrical or cylindrical inner magnet J2 concentrically located inside the outer magnet J1, and the inner magnet J2.
  • the first magnetic body J3 and the second magnetic body J4 that is in close contact with the other surface of the outer magnet J1, and the annular plate or circle that is in close contact with the other surface of the inner magnet J2.
  • the magnetic gap JG is formed between the inner surface J4a of the second magnetic body J4 and the outer surface J5a of the third magnetic body J5.
  • the outer magnet J1 and the inner magnet J2 have magnetic poles magnetized in opposite directions in the direction along the inner surface J4a or the outer surface J5a.
  • Patent Document 1 Japanese Utility Model Publication No. 58-599
  • An object of the present invention is to deal with such a problem. That is, the present invention provides a spin force that can achieve a desired reproduction output even in a high temperature environment while providing a thinner speaker, and providing a magnetic circuit that does not decrease the driving force even in a high temperature environment. Is the purpose.
  • a speaker magnetic circuit and a speaker according to the present invention include at least the configurations according to the following independent claims.
  • a magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, a vibrating body that vibrates by a driving force acting on the voice coil, and an outer peripheral edge of the magnetic circuit And a frame that supports an outer peripheral edge of the vibrating body, and the magnetic circuit includes an inner magnet disposed inside the magnetic gap, An outer magnet disposed outside and having a magnetizing direction opposite to that of the inner magnet, wherein one of the inner magnet and the outer magnet is a magnet having higher magnetic performance than the other. Yes Speaker.
  • a magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, a vibrating body that vibrates by a driving force acting on the voice coil, and an outer peripheral edge of the magnetic circuit And a frame that supports an outer peripheral edge of the vibrating body, and the magnetic circuit is disposed inside the magnetic gap, and is disposed outside the magnetic gap, and is attached to the inner magnet.
  • An outer magnet whose time direction is reversed, and one of the inner magnet and the outer magnet has a larger product of the holding force and the residual magnetic flux density than the other, and is a magnet. Speaker.
  • FIG. 1 is an explanatory diagram of a prior art.
  • FIG. 2 is an explanatory diagram (sectional view) showing a speaker magnetic circuit or a speaker according to an embodiment of the present invention.
  • FIG. 3 is an explanatory diagram (a plan view and a rear view) showing a speaker magnetic circuit or a speaker according to an embodiment of the present invention.
  • FIG. 4 is an explanatory view (a plan view and a cross-sectional view) showing a speaker magnetic circuit or a speaker according to another embodiment of the present invention.
  • FIG. 5 is an explanatory view (plan view) showing a speaker magnetic circuit or a speaker according to another embodiment of the present invention.
  • FIG. 2 is a sectional view of the whole
  • FIG. 3 is a plan view of a state in which a vibrating body is removed (FIG. 2).
  • FIG. 2 is a sectional view of the whole
  • FIG. 3 is a plan view of a state in which a vibrating body is removed (FIG. 2).
  • (a)) and rear view ((b)) are explanatory views for explaining a speaker magnetic circuit or speaker according to an embodiment of the present invention
  • FIG. 3 is a plan view of a state in which a vibrating body is removed
  • FIG. 2 is a sectional view of the whole
  • FIG. 3 is a plan view of a state in which a vibrating body is removed (FIG. 2).
  • (a)) and rear view ((b))).
  • the direction in which the speaker emits sound is described as “front” or “front”, and the opposite direction is described as “rear” or “rear”.
  • the speaker 1 includes a magnetic circuit 10 that forms a magnetic gap G, a voice coil 20 disposed in the magnetic gap G, a diaphragm 21, an outer peripheral edge of the magnetic circuit 10, and an outer peripheral edge of the diaphragm 21. And a frame 3 for supporting the part.
  • the voice coil 20 and the diaphragm 21 constitute a vibrating body 2 that vibrates by a driving force acting on the voice coil 20.
  • the diaphragm 21 is disposed so as to cover the entire front of the magnetic circuit 10, and acts as a force with the central dome portion 21a and the outer peripheral dome portion 21b formed around the central dome portion 21a.
  • the front end of the voice coil 20 is connected to the boundary of the outer dome 21b.
  • a grill frame 4 is attached to the outer peripheral edge of the frame 3 as necessary.
  • the frame 3 and the grill frame 4 can be formed by, for example, injection molding using a resin. Further, the magnetic circuit 10 and the frame 3 can be integrally formed by insert molding or the like.
  • the magnetic circuit 10 includes an inner magnet 11 disposed inside the magnetic gap G and an outer magnet 12 disposed outside the magnetic gap G.
  • the inner magnet 11 and the outer magnet Both have a magnetization direction that is directed forward or backward, and have opposite magnetization directions.
  • the inner magnet 11 is an oval permanent magnet having a vent hole 11a in the center, and the outer magnet 12 is arranged on the outer side via a magnetic gap G. Permanent magnet.
  • a plate-like yoke (magnetic body) 13 having a vent hole 13 a in the center is provided so as to be in close contact with the rear surfaces of the inner magnet 11 and the outer magnet 12.
  • An inner plate 14 (magnetic material) having a vent hole 14a in the center is provided so as to be in close contact with the front surface
  • an annular plate-shaped outer plate 15 (magnetic material) is provided so as to be in close contact with the front surface of the outer magnet 12.
  • a magnetic gap G is formed between the outer peripheral surface 14 b of the inner plate 14 and the inner peripheral surface 15 a of the outer plate 15.
  • the vent holes 11a, 13a, and 14a described above are provided so as to penetrate coaxially, and are provided in order to release the back pressure in the central portion of the diaphragm 21a backward.
  • the magnetic circuit 10 uses one of the inner magnet 11 and the outer magnet 12 as a magnet having higher magnetic performance than the other.
  • the temperature range in which the reversibility of the magnetic characteristics of the magnet is maintained may be considered.
  • a magnet has a temperature range in which magnetic properties are maintained (also referred to as a reversible temperature range or a use temperature, but hereinafter referred to as a reversible temperature range).
  • a magnet with a temperature of 80 ° C to 80 ° C is heated from room temperature to 100 ° C and then cooled to room temperature.
  • there is a large difference in the magnetic force of the magnet at normal temperature before and after heating that is, the magnetic force is smaller after heating than before heating (demagnetization phenomenon).
  • the reversible temperature range is large, the magnetic performance of the magnet is high.
  • the reversible temperature range of ferrite magnets is generally from room temperature to 300 ° C, alnico magnets from room temperature to 450 ° C, In normal temperature to about 300 ° C, for neodymium magnets, it is about 0 ° C to 80 ° C.
  • rare earth magnets there are magnets in which the reversible temperature range is increased by changing constituent components and the like, and these magnets tend to have a large holding force.
  • some magnets have a large product of magnetic force (residual magnetic flux density) and coercive force (hereinafter referred to as BHmax), and such a magnet can be said to have high magnetic performance.
  • the permanent magnet used in the magnetic circuit for the speaker is a magnet having a small magnetic force but a high magnetic performance
  • the driving force for driving the vibrating body is reduced, but the inner magnet 11 and the outer magnet 12
  • one of the magnetic circuits is made of a magnet that has a larger magnetic force and a smaller magnetic performance than the other, it is possible to suppress a decrease in the driving force due to the demagnetization phenomenon while ensuring the desired driving force. Do not degrade the performance of the speaker in a high-temperature environment.
  • a speaker magnetic circuit or speaker can be obtained.
  • the magnetic circuit for the speaker or the spin force that more effectively suppresses the performance degradation due to the demagnetization phenomenon by making the one having the larger surface area of the inner magnet 11 and the outer magnet 12 a magnet having high magnetic performance.
  • the magnetic circuit for the speaker or the spin force that more effectively suppresses the performance degradation due to the demagnetization phenomenon by making the one having the larger surface area of the inner magnet 11 and the outer magnet 12 a magnet having high magnetic performance.
  • the magnetic circuit for the speaker or the spin force that more effectively suppresses the performance degradation due to the demagnetization phenomenon by making the one having the larger surface area of the inner magnet 11 and the outer magnet 12 a magnet having high magnetic performance.
  • vent holes 3 A and 3 B for releasing the back pressure of the vibrating body 2 are provided in the frame 3.
  • the air holes 3A, 3B release the back pressure of the vibrating body 2, thereby reducing the air resistance when vibrating the vibrating body 2, and reducing the driving force to obtain the desired vibration. Can be reduced. Therefore, in the magnetic circuit composed of the inner magnet 11 and the outer magnet 12, even if one of the magnets has a higher magnetic performance than the other, by providing the air holes 3A and 3B, the vibrating body 2 Can be vibrated at a desired amplitude or vibration speed, and the speaker 2 capable of producing a desired output can be obtained.
  • FIG. 3 is a plan view (FIG. (A)) and a rear view (FIG. (B)) of the magnetic circuit 10 and the frame 3 with the vibrating body 2 removed.
  • a plurality of air holes 3A and 3B are provided dispersed around the magnetic circuit 10.
  • the vent hole 3B is provided so as to overlap the terminal portion 5 for supplying a voice signal to the voice coil 20 attached to the frame 3.
  • FIG. 4 is an explanatory view showing another embodiment of the present invention (FIG. 4 (a) is a plan view, FIG. 4 (b) is an XX cross-sectional view; The same reference numerals are used, and duplicate descriptions are omitted).
  • the outer shape of the inner magnet 11 is circular or oval in plan view
  • the outer shape of the outer magnet 12 is substantially rectangular in plan view with corners cut off
  • the vent 3A is cut off in the corners of the outer magnet 12. It is provided in the space.
  • a plate-like yoke (magnetic body) 13 is provided so as to be in close contact with the rear surfaces of the inner magnet 11 and the outer magnet 12 as in the above-described embodiment.
  • an inner plate 14 (magnetic body) whose outer shape is circular or oval so as to be in close contact with the front surface of the inner magnet 11 is provided, and a corner is not provided so as to be in close contact with the front surface of the outer magnet 12.
  • a substantially rectangular outer plate 15 (magnetic material) is provided, and a magnetic gap G is formed between the outer peripheral surface 14 b of the inner plate 14 and the inner peripheral surface 15 a of the outer plate 15. Then, one of the inner magnet 11 and the outer magnet 12 is made a magnet having higher magnetic performance than the other.
  • the magnetic circuit composed of the inner magnet 11 and the outer magnet 12 one of them is a magnet having higher magnetic performance than the other. While securing the driving force, it is possible to suppress a decrease in the driving force due to the demagnetization phenomenon, and it is possible to obtain a speaker magnetic circuit or speaker that does not cause a decrease in performance in a high temperature environment.
  • the vent 3A releases the back pressure of the vibrating body, the air resistance when vibrating the vibrating body is reduced, and the driving force for obtaining the desired vibration can be reduced.
  • the vibrating body can be vibrated with a desired amplitude or vibration speed. it can.
  • vent hole 3A the air in the speaker and the external cold air can be exchanged by the vibration of the vibrating body, so that it is possible to prevent the temperature in the magnetic circuit from becoming very high. In addition, it is possible to suppress a decrease in driving force due to the occurrence of a demagnetization phenomenon.
  • the magnets, magnetic plates, yokes, and voice coils that make up the vibrating body can be cooled.
  • the sound can be reproduced with good reproducibility even if the speaker is used for a long time.
  • the resonance sharpness can be set to a desired size by changing the size or the like of the vent 3A.
  • vent hole 3A Since the vent hole 3A is provided in a space where the corner portion of the outer magnet 12 is missing, it is not necessary to widen the frame to secure the vent hole 3A, and the limited space is effectively used. A utilized speaker can be obtained.
  • one of the inner magnet and the outer magnet has a smaller magnetic force than the other, it is described that the magnetic performance is high, but naturally the magnetic force is small and the holding force is large. It doesn't matter.
  • one of the inner magnet and the outer magnet has a lower magnetic force than the other, it is described that the magnetic performance is high, but it is limited to these embodiments. There is nothing.
  • one of the inner magnet and the outer magnet may have substantially the same magnetic force between the inner magnet and the outer magnet that have higher magnetic force performance or higher holding force than the other.
  • an inner magnet and an outer magnet having substantially the same (BHmax) may be selected.
  • one of the inner magnet and the outer magnet may have a higher magnetic performance or a larger holding force and a larger magnetic force than the other.
  • one of the inner magnet and the outer magnet may have a higher magnetic performance or a larger holding force (BHmax) than the other.
  • Figs. 5 (a) to 5 (c) are explanatory views showing other embodiments of the present invention (the figure is a plan view; the same parts as those described above are denoted by the same reference numerals, and redundant description is given. Is omitted).
  • the outer shapes of the inner magnet 11 and the outer magnet 12 are rectangular in plan view.
  • the outer shape of the inner magnet 11 and the outer magnet 12 is an ellipse in plan view.
  • the outer shapes of the inner magnet 11 and the outer magnet 12 are circular in plan view.
  • the other parts are almost the same as in Fig. 4.
  • the outer shape of the inner magnet 11 and the outer magnet 12 shown in FIG. 4 is not limited, and may be a rectangular shape, a circular shape, an oval shape, or the like. Also, the outer shape of the inner magnet and the outer magnet may be different, for example, when the outer shape of the inner magnet 11 is an ellipse and the outer magnet is circular.
  • each embodiment of the present invention it is possible to provide a speaker that can obtain a desired reproduction output even in a high-temperature environment while supporting the reduction in thickness of the speaker.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

La présente invention concerne un haut-parleur capable de fournir une sortie de reproduction souhaitée, même dans un environnement aux températures élevées, tout en résistant à l'amincissement d'un haut-parleur. Un circuit magnétique (10) comprend des aimants internes (11) agencés dans le côté interne des intervalles magnétiques (G) et des aimants externes (12) placés dans le côté externe des intervalles magnétiques (G) et sont opposés aux aimants internes (11) dans la direction magnétisée, il fait des aimants internes (11) ou des aimants externes (12) des aimants ayant des performances magnétiques supérieures à d'autres et possède des orifices d'aération (3A, 3B) dans des trames (3) soutenant le circuit magnétique (10) et un vibrateur (2).
PCT/JP2006/324964 2006-12-14 2006-12-14 Haut-parleur et son circuit magnétique WO2008072332A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/324964 WO2008072332A1 (fr) 2006-12-14 2006-12-14 Haut-parleur et son circuit magnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/324964 WO2008072332A1 (fr) 2006-12-14 2006-12-14 Haut-parleur et son circuit magnétique

Publications (1)

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WO2008072332A1 true WO2008072332A1 (fr) 2008-06-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010084575A1 (fr) * 2009-01-20 2010-07-29 パイオニア株式会社 Dispositif haut-parleur et dispositif électronique
WO2012088518A2 (fr) 2010-12-23 2012-06-28 Niedermann Paul Haut-parleur à profil bas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57151094U (fr) * 1981-03-17 1982-09-22
JPS58599U (ja) * 1981-06-25 1983-01-05 ヤマウチ株式会社 スピ−カ−の磁気回路装置
JP2006254038A (ja) * 2005-03-10 2006-09-21 Matsushita Electric Ind Co Ltd スピーカの製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57151094U (fr) * 1981-03-17 1982-09-22
JPS58599U (ja) * 1981-06-25 1983-01-05 ヤマウチ株式会社 スピ−カ−の磁気回路装置
JP2006254038A (ja) * 2005-03-10 2006-09-21 Matsushita Electric Ind Co Ltd スピーカの製造方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010084575A1 (fr) * 2009-01-20 2010-07-29 パイオニア株式会社 Dispositif haut-parleur et dispositif électronique
WO2012088518A2 (fr) 2010-12-23 2012-06-28 Niedermann Paul Haut-parleur à profil bas
JP2014504108A (ja) * 2010-12-23 2014-02-13 ニーデルマン，ポール 薄型スピーカー
US9532145B2 (en) 2010-12-23 2016-12-27 Eagle Acoustics Manufacturing, Llc Low-profile speaker
EP2656636A4 (fr) * 2010-12-23 2017-08-02 Prescient Audio Mfg LLC Haut-parleur à profil bas

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