阅读说明：本技术 扬声器和制造扬声器的方法 (Loudspeaker and method of manufacturing a loudspeaker ) 是由 新免真己 野本航也 五十岚刚 起田贵成 于 2020-03-11 设计创作，主要内容包括：本发明的目的是提供具有强磁路的扬声器和制造扬声器的方法。为了实现该目的,根据本技术的一方面的扬声器包括外磁体和内磁体。外磁体具有环形状并沿环形状的轴向方向磁化。内磁体在从外磁体的轴向方向观察时具有圆形外形,沿轴向方向在与外磁体的方向相反的方向上磁化,并且通过间隙设置在外磁体内部。(An object of the present invention is to provide a speaker having a strong magnetic circuit and a method of manufacturing the speaker. To achieve the object, a speaker according to an aspect of the present technology includes an outer magnet and an inner magnet. The outer magnet has a ring shape and is magnetized in an axial direction of the ring shape. The inner magnet has a circular outer shape when viewed from the axial direction of the outer magnet, is magnetized in the axial direction in a direction opposite to the direction of the outer magnet, and is disposed inside the outer magnet through a gap.)

1. A loudspeaker, comprising:

an outer magnet having a ring shape and magnetized in an axial direction of the ring shape; and

an inner magnet having a circular outer shape when viewed from the axial direction of the outer magnet, magnetized in a direction opposite to the direction of the outer magnet in the axial direction, and disposed inside the outer magnet with a gap interposed therebetween.

2. The speaker of claim 1,

the inner magnet has a ring shape having an axial direction that is the same as the axial direction of the outer magnet.

3. The speaker of claim 2, further comprising:

an outer part portion comprising the outer magnet;

an inner member portion including the inner magnet and forming a magnetic gap with the outer member portion; and

and a vibrating plate component part including a vibrating plate and a coil disposed in the magnetic gap.

4. The speaker of claim 3,

the outer part has an opening which opens perpendicularly to the axial direction and has a larger diameter than the outer diameter of the inner magnet, an

The inner magnet is inserted into the opening and fixed.

5. The speaker of claim 4, wherein,

when a side of the vibrating plate member portion connected to the outer member portion in the axial direction is a first side, and a side opposite to the first side is a second side,

the opening is formed on the second side of the outer member portion.

6. The speaker of claim 4, wherein,

the lead wire of the coil is drawn out to the outside through the opening.

7. The speaker of claim 3,

the position of the central axis of the outer magnet, the position of the central axis of the inner magnet, and the position of the central axis of the coil are configured to be identical to each other, an

The inner part portion comprises a through hole extending in the axial direction at the location of the central axis of the inner magnet.

8. The speaker of claim 3,

when a side of the vibrating plate member portion connected to the outer member portion in the axial direction is a first side, and a side opposite to the first side is a second side,

the inner piece portion includes an inner yoke magnetically connected to the second side of the inner magnet.

9. The speaker of claim 8,

the inner yoke includes a first portion corresponding to the coil and a second portion corresponding to the inner magnet when viewed from the axial direction, and

the first portion has a thickness less than a thickness of the second portion.

10. The speaker of claim 8,

the outer member portion includes an outer yoke magnetically connected to the second side of the outer magnet.

11. The speaker of claim 10,

the inner yoke and the outer yoke are connected to each other by welding.

12. The speaker of claim 3,

the vibrating plate part portion includes a support magnet that supports the vibrating plate and is magnetized in a direction opposite to a direction of the outer magnet in the axial direction.

13. A method of manufacturing a loudspeaker, the method comprising the steps of:

forming an outer part portion including an outer magnet having a ring shape and magnetized in an axial direction of the ring shape;

forming an inner part portion including an inner magnet having a circular shape with a diameter smaller than an inner diameter of the outer magnet and magnetized in an axial direction of the circular shape; and

the outer member portion and the inner member portion are assembled such that the inner magnet is disposed inside the outer magnet with a gap therebetween and such that the magnetization direction of the outer magnet and the magnetization direction of the inner magnet are opposite to each other.

14. The method of manufacturing a loudspeaker according to claim 13,

the inner magnet has a ring shape with a diameter smaller than that of the outer magnet, an

Forming the inner piece portion includes forming a through hole extending in an axial direction at a position of a central axis of the inner magnet.

15. The method of manufacturing a loudspeaker according to claim 13,

assembling the outer member portion and the inner member portion includes inserting the inner magnet into an opening formed on a side opposite to a side of the outer member portion connected to a vibration plate member portion including a coil and a vibration plate.

16. The method of manufacturing a loudspeaker according to claim 13,

assembling the outer member portion and the inner member portion includes supporting at least one of the outer member portion and the inner member portion by a jig for making an axial direction of the outer magnets and an axial direction of the inner magnets the same.

17. The method of manufacturing a loudspeaker according to claim 13, the method further comprising:

forming a diaphragm part including a coil and a diaphragm; and

the outer member portion, the inner member portion, and the vibrating plate member portion are assembled such that the coil is disposed in a magnetic gap between the outer member portion and the inner member portion.

18. The method of manufacturing a loudspeaker according to claim 13, the method further comprising:

a diaphragm part portion including a coil and a diaphragm is formed, wherein,

forming the outer member portion comprises:

assembling an unmagnetized outer member portion and the vibrating plate member portion, an

Magnetizing the outer magnet that is not magnetized after assembling the outer member portion and the vibration plate member portion that are not magnetized, an

Assembling the outer member portion and the inner member portion comprises:

the inner part portion is assembled to the outer part portion to which the vibrating plate part portion is assembled so that the coil is disposed in a magnetic gap between the outer part portion and the inner part portion.

19. The method of manufacturing a loudspeaker according to claim 18,

forming the outer member portion comprises: between the assembly of the unmagnetized outer member portion and the vibrating plate member portion and the magnetized unmagnetized outer magnet, lead wires of the coil of the vibrating plate member portion are fixed by welding.

20. The method of manufacturing a loudspeaker according to claim 17,

when the side of the vibrating plate member portion connected to the outer member portion is a first side, and the side opposite to the first side is a second side,

forming the outer member portion includes disposing an outer yoke on a second side of the outer magnet,

forming the inner piece portion includes disposing an inner yoke on a second side of the inner magnet, an

Assembling the outer member portion and the inner member portion includes joining the outer yoke and the inner yoke to each other by welding.

Technical Field

The present technology relates to a speaker and a method of manufacturing a speaker.

Background

Conventionally, as small speakers used in earphones and the like, there are known an internal magnetic speaker and an external magnetic speaker. For example, fig. 1, 5, and 6 of patent document 1 show an internal magnetic speaker. Fig. 4 and 7 of patent document 1 show an external magnet type speaker. Among them, in the internal magnet type speaker shown in fig. 1 and 5 and the external magnet type speaker shown in fig. 4, the permanent magnet is divided into a plurality of magnets, and the plurality of magnets are formed by a transverse magnetic field pressing method. This improves the magnetic characteristics of the permanent magnet, and realizes a strong and efficient magnetic circuit (for example, paragraphs [ 0022 ], [ 0034 ], and the like of the specification of patent document 1).

Further, fig. 4, 5, and 7 to 10 of patent document 2 show an external magnet type speaker. In this external magnet type speaker, a conductor portion, which is a structure having a smaller resistance ratio than a magnet material constituting a magnetic circuit, is provided in the vicinity of a voice coil of a driver unit. Then, electromagnetic inductive coupling is generated between the voice coil and the conductor portion to reduce the inductance of the voice coil. This achieves a good noise canceling effect (for example, paragraphs [ 0040 ] to [ 0047 ] and the like of the specification of patent document 2).

CITATION LIST

Patent document

Patent document 1: japanese patent application publication No. 2005-311449,

patent document 2: japanese patent application laid-open No. 2008-187456.

Disclosure of Invention

Technical problem

As described above, techniques for improving speaker performance have been developed, and new techniques capable of realizing a powerful magnetic circuit are desired.

In view of the above, it is an object of the present technology to provide a speaker including a strong magnetic circuit and a method of manufacturing the speaker.

Solution to the problem

In order to achieve the above object, a speaker according to an embodiment of the present technology includes an outer magnet and an inner magnet.

The outer magnet has a ring shape and is magnetized in an axial direction of the ring shape.

The inner magnet has a circular outer shape when viewed from the axial direction of the outer magnet, is magnetized in the axial direction in a direction opposite to the direction of the outer magnet, and is disposed inside the outer magnet through a gap.

In this speaker, an inner magnet magnetized in a direction opposite to the direction of an outer magnet is disposed inside the ring-shaped outer magnet through a gap. This makes it possible to provide a speaker having a strong magnetic circuit.

The inner magnet may have a ring shape having an axial direction equal to that of the outer magnet.

The speaker further includes an outer member portion, an inner member portion, and a diaphragm member portion.

The outer part portion includes an outer magnet.

The inner part portion includes an inner magnet and forms a magnetic gap with the outer part portion.

The vibrating plate component part includes a vibrating plate and a coil disposed in the magnetic gap.

The outer part portion may have an opening which opens perpendicular to the axial direction and has a larger diameter than the outer diameter of the inner magnet. In this case, the inner magnet may be inserted into the opening and fixed.

When a side of the vibrating plate member portion connected to the outer member portion in the axial direction is a first side, and a side opposite to the first side is a second side, the opening may be formed on the second side of the outer member portion.

The lead wire of the coil may be drawn out to the outside through the opening.

The position of the central axis of the outer magnet, the position of the central axis of the inner magnet, and the position of the central axis of the coil may be configured to be equal to each other. In this case, the inner part portion may comprise a through hole extending in the axial direction at the location of the central axis of the inner magnet.

When the side of the vibration plate member portion connected to the outer member portion in the axial direction is a first side and the side opposite to the first side is a second side, the inner member portion may include an inner yoke magnetically connected to the second side of the inner magnet.

The inner yoke may include a first portion corresponding to the coil and a second portion corresponding to the inner magnet when viewed from the axial direction. In this case, the thickness of the first portion may be smaller than the thickness of the second portion.

The outer member portion may include an outer yoke magnetically connected to a second side of the outer magnet.

The inner yoke and the outer yoke may be connected to each other by welding.

The vibration plate part portion may include a support magnet that supports the vibration plate and is magnetized in a direction opposite to a direction of the outer magnet in the axial direction.

A method of manufacturing a speaker according to an embodiment of the present technology includes: forming an outer part portion including an outer magnet having a ring shape and magnetized in an axial direction of the ring shape; forming an inner part portion including an inner magnet having a circular outer shape with a diameter smaller than an inner diameter of the outer magnet and magnetized in an axial direction of the circular shape; and assembling the outer member portion and the inner member portion such that the inner magnet is disposed inside the outer magnet through a gap and such that a magnetization direction of the outer magnet and a magnetization direction of the inner magnet are opposite to each other.

The inner magnet may have a ring shape having a diameter smaller than that of the outer magnet. In this case, forming the inner part portion may include forming a through hole extending in the axial direction at the position of the center axis of the inner magnet.

Assembling the outer member portion and the inner member portion may include inserting the inner magnet into an opening formed on a side opposite to a side of the outer member portion connected to the vibration plate member portion including the coil and the vibration plate.

Assembling the outer member portion and the inner member portion may include supporting at least one of the outer member portion and the inner member portion by a jig for equalizing an axial direction of the outer magnets and an axial direction of the inner magnets.

The method of manufacturing a speaker may further include: forming a diaphragm part including a coil and a diaphragm; and assembling the outer member portion, the inner member portion, and the vibrating plate member portion such that the coil is disposed in the magnetic gap between the outer member portion and the inner member portion.

The method of manufacturing a speaker may further include forming a diaphragm part including a coil and a diaphragm. In this case, forming the outer member portion may include assembling the unmagnetized outer member portion and the vibrating plate member portion, and magnetizing the unmagnetized outer magnet after assembling the unmagnetized outer member portion and the vibrating plate member portion. Further, assembling the outer member portion and the inner member portion may include assembling the inner member portion to the outer member portion assembled with the vibrating plate member portion such that the coil is disposed in a magnetic gap between the outer member portion and the inner member portion.

Forming the outer member portion may include fixing a lead wire of a coil of the vibrating plate member portion by welding between assembling the unmagnetized outer member portion and the vibrating plate member portion with the magnetized unmagnetized outer magnet.

When a side of the vibrating plate member portion connected to the outer member portion is a first side and a side opposite to the first side is a second side, forming the outer member portion may include disposing the outer yoke on the second side of the outer magnet. In this case, forming the inner piece portion may include disposing the inner yoke on the second side of the inner magnet. Further, assembling the outer member portion and the inner member portion may include connecting the outer yoke and the inner yoke to each other by welding.

Drawings

Fig. 1 is a schematic cross-sectional view showing a configuration example of a speaker according to the first embodiment.

Fig. 2 is a schematic cross-sectional view respectively showing an outer assembly, an inner assembly, and a diaphragm assembly included in a speaker.

Fig. 3 is a schematic diagram showing a positional relationship among the outer magnet, the inner magnet, and the voice coil included in the speaker when viewed from the axial direction of the reference axis.

Fig. 4 is a schematic diagram for describing an example of a method of manufacturing a speaker.

Fig. 5 is a schematic diagram for describing an example of a method of manufacturing a speaker.

Fig. 6 is a schematic diagram for describing an example of a method of manufacturing a speaker.

Fig. 7 is a schematic diagram for describing an example of a method of manufacturing a speaker.

Fig. 8 is a schematic cross-sectional view showing a configuration example of a speaker according to the second embodiment.

Fig. 9 is a schematic cross-sectional view respectively showing an outer assembly, an inner assembly, and a diaphragm assembly included in a speaker.

Fig. 10 is a schematic diagram showing a magnetic flux density distribution in the magnetic gap.

Fig. 11 is a schematic cross-sectional view showing a configuration example of a speaker according to another embodiment.

Fig. 12 is a schematic diagram showing a magnetic flux density distribution in the magnetic gap.

Fig. 13 is a schematic diagram showing a configuration example of a speaker unit according to another embodiment.

Detailed Description

Embodiments according to the present technology will now be described below with reference to the accompanying drawings.

< first embodiment >

[ speaker arrangement ]

Fig. 1 is a schematic cross-sectional view showing a configuration example of a speaker according to a first embodiment of the present technology. A speaker is a device that outputs sound by driving an amplified output of a sound signal to emit the sound into a space. The loudspeaker may also be referred to as a driver.

The speaker 100 according to this embodiment has a general shape of a columnar shape as a whole. The cross-sectional view shown in fig. 1 is a cross-sectional view taken in the axial direction of the center axis of the diametrically columnar shape of the speaker 100. Hereinafter, the center axis of the speaker 100 will be referred to as a reference axis C.

Fig. 2 is a schematic cross-sectional view respectively showing the outer assembly 10, the inner assembly 30, and the diaphragm assembly 50 included in the speaker 100. Fig. 3 is a schematic diagram showing a positional relationship among the outer magnet 12, the inner magnet 31, and the voice coil 52 included in the speaker 100 when viewed from the axial direction of the reference axis C.

Hereinafter, a configuration example of the speaker 100 according to this embodiment will be described with reference to fig. 1 to 3.

Note that, in the following description, the axial direction of the reference axis C shown in fig. 1 will be described as a vertical direction for convenience. For each member, expressions such as an upper side of the member and a lower side of the member will be used. Of course, the direction or the like in which the speaker 100 is used is not limited, and the axial direction of the reference axis C may be set to any direction.

As shown in fig. 1 and 2, the speaker 100 includes an outer assembly 10, an inner assembly 30, and a vibration plate assembly 50. In this embodiment, each assembly is configured with a reference axis C as a reference.

Outer assembly

The outer assembly 10 includes a case 11, outer magnets 12, an outer plate 13, and a terminal plate 14.

The housing 11 has a cylindrical shape with an open upper side, and is formed such that the reference axis C is a central axis. The housing 11 includes side portions 15 and a bottom portion 16. The side portion 15 is formed so as to surround the reference axis C and extend in the axial direction of the reference axis C.

The bottom portion 16 is coupled to the lower side of the side portion 15, and is formed in a direction perpendicular to the axial direction of the reference axis C. Further, a circular opening 17 is formed at the center portion of the bottom portion 16 centering on the position of the reference axis C. The opening 17 opens perpendicular to the axial direction of the reference axis C.

The housing 11 is a non-magnetic body and is formed, for example, of any non-magnetic material such as plastic.

As shown in fig. 3, the outer magnet 12 has a ring shape (annular shape), and is formed such that the reference axis C is a central axis. Therefore, the axial direction of the ring shape of the outer magnet 12 is equal to the axial direction of the reference axis C.

As shown in fig. 1 and 2, the outer magnets 12 are disposed inside the side portions 15 of the case 11 and on the upper side of the bottom portion 16. Thus, the outer magnet 12 is supported by the housing 11 such that the outer peripheral side thereof is surrounded by the housing 11.

The inner diameter of the outer magnet 12 is larger than the diameter of the opening 17 formed in the bottom portion 16. The outer magnet 12 has an outer diameter smaller than the outer diameter of the bottom portion 16. Thus, the outer magnet 12 is arranged to fit within the bottom portion 16 of the housing 11 when viewed in the axial direction of the reference axis C.

Further, as shown in fig. 1 and 2, the outer magnet 12 is magnetized in the axial direction of the ring shape, i.e., the axial direction of the reference axis C. In this embodiment, the outer magnet 12 is magnetized such that the upper side is the S pole and the lower side is the N pole.

Examples of the outer magnet 12 to be used include a permanent magnet formed of any magnetic material (such as a ferrite magnet, alnico magnet, or neodymium magnet).

The outer plate 13 has a ring shape, and is formed such that the reference axis C is a central axis. The outer plate 13 is disposed on the upper side of the outer magnet 12. The inner diameter of the outer plate 13 is smaller than the inner diameter of the outer magnets 12, and the outer diameter of the outer plate 13 is larger than the outer diameter of the outer magnets 12. Therefore, the outer plate 13 is provided to cover the entire surface of the upper side of the outer magnet 12 when viewed from the axial direction of the reference axis C.

The outer plates 13 are soft magnetic and are formed of any soft magnetic material, such as iron. Thus, the outer plate 13 is magnetically connected to the outer magnet 12. The outer plate 13 is provided for magnetic induction and serves as a member constituting a magnetic circuit. That is, the outer plate 13 functions as a yoke.

The terminal plate 14 has a ring shape, and is formed such that the reference axis C is a central axis. The terminal plate 14 is connected to the lower side of the bottom portion 16 of the housing 11. The terminal plate 14 has an inner diameter larger than that of the opening 17 formed in the bottom portion 16. Therefore, the terminal plate 14 does not close the opening 17.

The terminal plate 14 has a function of fastening a lead wire when the lead wire of the voice coil 52 of the diaphragm assembly 50 is drawn out to the outside. Note that illustration of the lead wire of the voice coil 52 is omitted in fig. 1 and 2. The lead of the voice coil 52 will be described later.

The inner assembly 30 includes an inner magnet 31, a pole piece 32 and an inner yoke 33.

As shown in fig. 3, the inner magnet 31 has a ring shape, and is formed such that the reference axis C is a central axis. Therefore, the axial direction of the ring shape of the inner magnet 31 is equal to the axial direction of the reference axis C. Therefore, the axial direction of the outer magnet 12 and the axial direction of the inner magnet 31 are equal to each other.

The outer shape of the inner magnet 31 (the shape of the outer peripheral surface 31 a) is a circular shape when viewed from the axial direction of the reference axis C. The outer diameter of the inner magnet 31 is smaller than the diameter of the opening 17 formed in the bottom portion 16 of the outer assembly 10. Thus, the outer diameter of the inner magnet 31 is smaller than the inner diameter of the outer magnet 12 of the outer assembly 10. As shown in fig. 1 and 3, the inner magnet 31 is disposed inside the outer magnet 12 through a gap G1. The width of the gap G1 is designed to be uniform over the entire circumference of the reference axis C.

Further, in this embodiment, the thickness of the outer magnet 12 and the thickness of the inner magnet 31 are designed to be equal to each other in the vertical direction. Further, the position of the outer magnet 12 and the position of the inner magnet 31 are designed to be equal to each other in the vertical direction.

That is, in the vertical direction, the upper surface of the outer magnet 12 and the upper surface of the inner magnet 31 are at equal positions to each other. Further, in the vertical direction, the lower surface of the outer magnet 12 and the lower surface of the inner magnet 31 are at equal positions to each other. It is to be understood that the present technology is not limited to such a configuration.

Further, as shown in fig. 1 and 2, the inner magnet 31 is magnetized in the axial direction of the ring shape, i.e., the axial direction of the reference axis C. In this embodiment, the inner magnet 31 is magnetized in the opposite direction of the outer magnet 12. That is, the inner magnet 31 is magnetized such that the upper side is the N pole and the lower side is the S pole.

Examples of the inner magnet 31 to be used include a permanent magnet formed of any magnetic material (such as a ferrite magnet, an alnico magnet, or a neodymium magnet). As the inner magnet 31, the same type of permanent magnet as that of the outer magnet 12 may be used, or a different type of permanent magnet may be used.

The pole piece 32 has a ring shape, and is formed such that the reference axis C is a central axis. The pole piece 32 is disposed on the upper side of the inner magnet 31. The pole piece 32 has an outer diameter greater than the outer diameter of the inner magnet 31 and less than the diameter of the opening 17 of the outer assembly 10. The inner diameter of the pole piece 32 has the same size as the inner diameter of the inner magnet 31.

In this embodiment, the thickness of the pole piece 32 and the thickness of the outer plate 13 of the outer assembly 10 are designed to be equal to each other in the vertical direction. Further, the position of the pole piece 32 and the position of the outer plate 13 are designed to be equal to each other in the vertical direction.

That is, in the vertical direction, the upper surface of the pole piece 32 and the upper surface of the outer panel 13 are at positions equal to each other. Further, in the vertical direction, the lower surface of the pole piece 32 and the lower surface of the outer panel 13 are at positions equal to each other. It is to be understood that the present technology is not limited to such a configuration.

The pole pieces 32 are soft magnetic and are formed of any soft magnetic material, such as iron. Thus, the pole piece 32 is magnetically connected to the inner magnet 31. The pole piece 32 is provided for magnetic induction and functions as a member constituting a magnetic circuit. That is, the pole piece 32 functions as a yoke.

The inner yoke 33 has a ring shape, and is formed such that the reference axis C is a central axis. The inner yoke 33 is disposed on the lower side of the inner magnet 31. The inner yoke 33 has an outer diameter greater than the diameter of the opening 17 of the outer assembly 10. Therefore, the outer diameter of the inner yoke 33 is larger than that of the inner magnet 31.

As shown in fig. 1, the inner yoke 33 is connected to the bottom portion 16 of the housing 11 of the outer assembly 10. Specifically, the bottom portion 16 and the inner yoke 33 are connected to each other so as to close the opening 17 formed in the bottom portion 16.

In this embodiment, a connecting portion 34 to be connected to the bottom portion 16 (opening 17) is formed at the outer peripheral portion of the inner yoke 33. For example, a step, a chamfered surface, or the like is formed as the connecting portion 34. This makes it possible to improve the accuracy of alignment between the outer assembly 10 and the inner assembly 30 and ensure the coaxiality. Of course, the connecting portion may be provided at the bottom portion 16 (opening 17) instead of or in addition to the outer peripheral portion of the inner yoke 33.

The inner yoke 33 has an inner diameter equal to that of the inner magnet 31. Therefore, the through hole 35 extending in the axial direction at a position in the central axial direction of the inner magnet 31 (position of the reference axis C) is arranged by the central holes of the inner magnet 31, the pole piece 32, and the inner yoke 33.

The inner yoke 33 is a soft magnetic body and is formed of any soft magnetic material such as iron. Thus, the inner yoke 33 is magnetically connected to the inner magnet 31. The inner yoke 33 is provided for magnetic induction and functions as a member constituting a magnetic circuit.

Diaphragm assembly 50 includes diaphragm 51, voice coil 52, and diaphragm ring 53. The vibration plate 51 vibrates by the amplified output of the sound signal, and has a function of emitting a sound wave into a space. The vibration plate 51 is also referred to as a diaphragm.

The vibration plate 51 has a circular outer shape centered on the position of the reference axis C when viewed from the reference axis C. The vibration plate 51 is formed of any easily deformable material such as polyethylene terephthalate (PET) or a liquid crystal polymer.

The voice coil 52 is connected to the vibration plate 51 to vibrate the vibration plate 51 based on the amplified output of the sound signal. The voice coil 52 has a cylindrical shape, and is formed such that the reference axis C is a central axis. As shown in fig. 3, the voice coil 52 is positioned in the gap G1 between the outer magnet 12 and the inner magnet 31 when viewed in the axial direction of the reference axis C. The number of turns of the voice coil 52, the material of the wire, and the like are not limited, and any configuration may be adopted.

The diaphragm ring 53 serves as a member supporting the vibration plate 51. Providing the diaphragm ring 53 makes it possible to improve the operation of the vibration plate 51. The diaphragm ring 53 has a ring shape, and is formed such that the reference axis C is a central axis. The diaphragm ring 53 is coupled to the vibration plate 51 so as to support an outer peripheral portion of the vibration plate 51.

Further, as shown in FIG. 1, a diaphragm ring 53 is coupled to an upper side of the housing 11 of the outer assembly 10. In this embodiment, any non-magnetic body (e.g., brass) is used as the diaphragm ring 53. Note that the diaphragm ring 53 may also be used as a spacer.

In this embodiment, the outer assembly 10 and the inner assembly 30 are assembled so as to constitute a magnetic circuit. Specifically, the outer magnets 12 and the outer plates 13 of the outer assembly 10 and the inner magnets 31, the pole pieces 32 and the inner yoke 33 of the inner assembly 30 constitute a magnetic circuit.

Further, a magnetic gap is formed between the outer assembly 10 and the inner assembly 30. Specifically, the gap G1 between the outer magnet 12 and the inner magnet 31 and the gap G2 between the outer plate 13 and the pole piece 32 function as magnetic gaps. The diaphragm assembly 50 is assembled such that the voice coil 52 is disposed between the magnetic gaps.

In this embodiment, each component of the outer assembly 10, each component of the inner assembly 30, and each component of the vibrating plate assembly 50 are coaxially arranged with reference to a reference axis C. Therefore, as shown in fig. 3, the position of the central axis of the outer magnet 12, the position of the central axis of the inner magnet 31, and the position of the central axis of the voice coil 52 are configured to be equal to each other.

Further, as shown in fig. 3, when viewed from the axial direction of the reference axis C, the outer peripheral surface 12a and the inner peripheral surface 12b of the outer magnet 12, the outer peripheral surface 52a and the inner peripheral surface 52b of the voice coil 52, and the outer peripheral surface 31a and the inner peripheral surface 31b of the inner magnet 31 are concentric with each other. The two permanent magnets of the outer magnet 12 and the inner magnet 31 sandwich the voice coil 52 therebetween so that a very strong magnetic circuit can be constructed.

A through hole 35 formed in the inner assembly 30 and extending in the axial direction is positioned on the lower side of the center of the vibration plate 51 of the vibration plate assembly 50. Therefore, it is possible to release the back pressure of the vibration plate 51 from the inside of the speaker 100 and improve the acoustic characteristics.

Further, as shown in fig. 1, in this embodiment, a first portion 33a corresponding to the lower side of the voice coil 52 and a second portion 33b corresponding to the lower side of the inner magnet 31 are defined for the inner yoke 33 of the inner assembly 30. The thickness of the first portion 33a is designed to be smaller than that of the second portion 33 b. This is a configuration found by focusing on the fact that the first portion 33a is less susceptible to magnetic saturation than the second portion 33 b.

The reduction in the thickness of the first portion 33a corresponding to the voice coil 52 makes it possible to increase the movable range of the voice coil 52 and improve the acoustic characteristics.

Note that the application of the present technology is not limited to the configurations shown in fig. 1 to 3. Further, in the present disclosure, the circular shape includes not only a true circular shape but also an elliptical shape and the like. For example, the present technology may also be applied if the shapes of the outer magnet 12, the voice coil 52, and the inner magnet 31 are any shapes other than an elliptical shape or the like when viewed from the reference axis C.

In this embodiment, the outer member 10 corresponds to an outer member portion. The inner assembly 30 corresponds to the inner member portion. The vibration plate assembly 50 corresponds to a vibration plate part portion. Each component part may be referred to as a unit or a module.

Further, in this embodiment, the voice coil 52 corresponds to a coil. Further, the upper side corresponds to a first side, which is a side where the vibrating plate member portion is connected to the outer member portion. Further, the lower side corresponds to a second side opposite to the first side. Further, the first portion 33a of the inner yoke 33 is a portion corresponding to the voice coil 52 when viewed from the axial direction of the reference axis C. The second portion 33b of the inner yoke 33 is a portion corresponding to the inner magnet 31 when viewed from the axial direction of the reference axis C. The first portion and the second portion may be referred to as a portion overlapping the voice coil 52 and a portion overlapping the inner magnet 31, respectively, when viewed from the axial direction of the reference axis C.

Further, the outer and inner assemblies 10, 30 may also be referred to as outer and inner magnetic circuit assemblies, respectively. Additionally, while the speaker 100 itself is considered an assembly, the outer assembly 10, the inner assembly 30, and the diaphragm assembly 50 may also be considered a subassembly. For example, outer assembly 10, inner assembly 30, and diaphragm assembly 50 may also be referred to as an outer magnetic circuit subassembly, an inner magnetic circuit subassembly, and a diaphragm subassembly, respectively.

Method for manufacturing loudspeaker

Fig. 4 to 7 are schematic diagrams for describing an example of a method of manufacturing the speaker 100.

As shown in a of fig. 4, the case 11, the ferrimagnet 20, and the outer plate 13 are assembled with reference to the reference axis C. The ferrimagnet 20 is a component which becomes the outer magnet 12 shown in fig. 1 and the like when magnetized. In the following, a ferrimagnet, which functions as a permanent magnet when magnetized, is described as an unmagnetized magnet. Hereinafter, the ferrimagnet 20 shown in fig. 4 is described as an unmagnetized outer magnet 20 by using the same reference numeral.

Note that the method of assembling each member is not limited. Any connecting method corresponding to the material of the member or the like may be adopted, such as bonding using an adhesive or the like, welding, or bonding using a screw or the like. This also applies the following assembly steps.

As shown in B of fig. 4, the terminal plate 14 is connected to the lower side of the housing 11. Thus, as compared to the outer assembly 10 shown in B of fig. 2, a configuration is provided in which the outer magnet 12 is in an unmagnetized state.

Hereinafter, the components incorporated into the unmagnetized outer magnet 20 shown in B of fig. 4 will be described as the unmagnetized outer component 25. Thus, it can be said that B of fig. 4 is a diagram showing a step of forming the unmagnetized outer assembly 25.

For example, in the unmagnetized outer assembly 25 shown in B of fig. 4, the unmagnetized outer magnet 20 is magnetized. This completes the step of forming the outer assembly 10 according to this embodiment.

Note that, of the outer plate 13 formed of a soft magnet and the unmagnetized outer magnet 20 formed of a ferrimagnet, the unmagnetized outer magnet 20 has a low processing accuracy in many cases. Therefore, the outer dimensions of the outer plate 13 are designed to be larger than those of the unmagnetized outer magnet 20 when viewed from the axial direction of the reference axis C. This makes it possible to improve the workability of the step of forming the unmagnetized outer member 25.

The terminal plate 14 may be provided in another assembly. The terminal plate 14 may be provided at any position as long as it does not interfere with the assembly of the inner assembly 30. For example, the terminal plate 14 may be formed on the side surface of the housing 11 using a flexible substrate or the like.

The vibration plate assembly 50 shown in a of fig. 2 is formed as a step different from the step of forming the unmagnetized outer assembly 25. That is, the diaphragm ring 53 is connected to the vibration plate 51. Further, the voice coil 52 is connected to the diaphragm 51. The specific method of forming the vibration plate assembly 50 is not limited, and any method may be employed.

As shown in a of fig. 5, the unmagnetized outer assembly 25 and the vibration plate assembly 50 are assembled. Specifically, the diaphragm ring 53 of the diaphragm assembly 50 is attached to the upper side of the housing 11 with reference to the reference axis C.

As shown in B of fig. 5, the lead wire 55 of the voice coil 52 of the diaphragm assembly 50 is drawn out to the outside through the opening 17 of the unmagnetized outer assembly 25. Then, the lead 55 is fixed to the terminal plate 14 by welding.

As shown in C of fig. 5, the unmagnetized outer magnet 20 is magnetized in the axial direction of the reference axis C. Thus, the outer magnet 12 shown in fig. 1 and 2 is provided. An outer assembly 10 as shown in fig. 1 and 2 is also provided.

That is, in this embodiment, the step of forming the outer assembly 10 includes: a step of assembling the unmagnetized outer assembly 25 and the vibration plate assembly 50; a step of fixing a lead wire 55 of the voice coil 52 of the diaphragm assembly 50 by soldering; and a step of magnetizing the unmagnetized outer magnets 20 in the stated order.

The welding of the lead wire 55 may be performed before the magnetization of the outer magnet 12 (when it is the unmagnetized outer magnet 20), which makes it possible to greatly improve the workability of the welding.

The inner assembly 30 shown in C of fig. 2 is formed as a step different from the steps described with reference to fig. 4 and 5. That is, the inner magnet 31, the pole piece 32, and the inner yoke 33 are assembled with reference to the reference axis C.

In this embodiment, in the step of forming the inner assembly 30, the inner magnet 31 having a ring shape having a diameter smaller than that of the outer magnet 12 is prepared. Then, a through hole 35 is formed at the position of the central axis of the inner magnet 31 so as to extend in the axial direction. Specifically, the inner magnet 31, the pole piece 32, and the inner yoke 33, which have a ring shape with an equal inner diameter, are assembled such that their central axes are at equal positions. Thus, the through hole 35 is formed.

Note that the present technique is not limited to the case where the inner magnet 31, the pole piece 32, and the inner yoke 33 all have the shape of a ring with an equal inner diameter. Even if the inner diameters of the respective parts are not equal to each other, a through-hole extending in the axial direction at the position of the reference axis C may be formed.

Further, in the pole piece 32 formed of a soft magnetic body and the inner magnet 31 formed of a ferrimagnetic body, the inner magnet 31 has a low processing accuracy in many cases. Therefore, the outer dimension of the pole piece 32 is designed to be larger than that of the inner magnet 31 when viewed from the axial direction of the reference axis C. This makes it possible to improve the workability of the step of forming the inner assembly 30.

As shown in fig. 6 and 7, the outer assembly 10 and the inner assembly 30 are assembled. In this embodiment, the inner assembly 30 is assembled in the outer assembly 10, with the vibrating plate assembly 50 assembled in the outer assembly 10.

The outer assembly 10 and the inner assembly 30 are assembled such that the inner magnet 31 is disposed inside the outer magnet 12 through the gap G1 and such that the magnetization direction of the outer magnet 12 and the magnetization direction of the inner magnet 31 are opposite to each other. Outer assembly 10 and inner assembly 30 are also assembled such that voice coil 52 is disposed in the magnetic gap between outer assembly 10 and inner assembly 30.

In this embodiment as shown in fig. 6, a jig 60 for equalizing the axial direction of the outer magnet 12 and the axial direction of the inner magnet 31 is used. The jig 60 can also be said to be a means for ensuring the coaxiality (coaxiality) of the outer assembly 10 and the inner assembly 30.

As shown in fig. 6, the inner assembly 30 is supported by a clamp 60. The outer assembly 10 assembled with the vibration plate assembly 50 is inserted into the jig 60. Therefore, as shown in fig. 7, the outer assembly 10 and the inner assembly 30 are precisely assembled in the jig 60 so as to be coaxial with the reference axis C as a reference. The jig 60 is removed, and thus the speaker 100 shown in fig. 1 is manufactured.

Note that, when the outer assembly 10 and the inner assembly 30 are assembled, the inner magnet 31 is inserted into the opening 17 of the outer assembly 10, the opening 17 being formed on a lower side opposite to an upper side to which the vibration plate assembly 50 is connected. Then, the inner magnet 31 inserted from the lower side is fixed. As described above, the method of manufacturing the speaker 100 according to this embodiment includes the step of inserting the inner magnet 31 into the opening 17 formed in the outer assembly 10.

The specific configuration of the jig 60, the assembly method using the jig 60, and the like are not limited, and any configuration and assembly method may be employed. For example, the outer assembly 10 may be supported by a clamp 60 and the inner assembly 30 may be inserted into the clamp 60. Of course, both the outer assembly 10 and the inner assembly 30 may be supported by the clamp 60.

When the speaker 100 is manufactured using the jig 60, the width of the magnetic gap becomes uniform in the circumferential direction, and very high output characteristics and acoustic characteristics can be provided.

Note that the outer assembly 10 and the inner assembly 30 can be assembled without using the jig 60. In addition, in the other steps described above, a jig for ensuring the coaxial position may be suitably used.

Note that illustration of the lead wire 55 is omitted in fig. 7. For example, the lead wire 55 is drawn out through a drawing groove or the like formed in the case 11 or the inner yoke 33. Alternatively, a space for withdrawing the lead wire 55 may be formed between the case 11 and the inner yoke 33. In addition, any configuration for withdrawing the lead 55 may be employed.

Further, the magnetization directions shown in fig. 1, 2, and 5 to 7 are only examples, and the magnetization direction of the inner magnet 31 and the magnetization direction of the outer magnet 12 only need to be opposite directions. That is, the outer magnet 12 may be magnetized such that the upper side is an N pole and the lower side is an S pole. In this case, the inner magnet 31 is magnetized such that the upper side is the S pole and the lower side is the N pole.

The method of manufacturing the speaker 100 is not limited to the method described with reference to fig. 4 to 7. For example, the vibration plate assembly 50, the outer assembly 10 and the inner assembly 30 shown in fig. 2 are separately formed. Subsequently, the outer assembly 10, inner assembly 30, and diaphragm assembly 50 may be assembled such that voice coil 52 is disposed in the magnetic gap between the outer assembly 10 and inner assembly 30.

In addition, for example, any manufacturing method may be employed, which includes the steps of assembling the outer assembly 10 and the inner assembly 30 such that the inner magnet 31 is disposed inside the outer magnet 12 through a gap and such that the magnetization direction of the outer magnet 12 and the magnetization direction of the inner magnet 31 are opposite to each other.

In the above, in the speaker 100 according to this embodiment, the inner magnet 31 magnetized in the direction opposite to the direction of the outer magnet 12 is disposed inside the ring-shaped outer magnet 12 via the gap G1. This makes it possible to realize the speaker 100 including the strong magnetic circuit.

Electroacoustic transducers (loudspeakers) have a variety of basic structures and systems. Among them, electrodynamic loudspeakers are widely used for consumer and professional use due to the sound pressure to be generated and the feasibility. The basic structure of an electrodynamic speaker includes a magnetic circuit using a permanent magnet, a vibration plate, and a voice coil attached to the vibration plate and suspended in a magnetic gap (it does not matter whether the attachment of the vibration plate is performed by a direct method, a method via a bobbin, or the like).

When an electrical signal flows through the voice coil, the voice coil moves according to Fleming's left hand rule. This moving force becomes stronger in proportion to the magnetic flux density in the magnetic gap. Here, when focusing on the configuration of the magnetic circuit, either of the internal magnetic type and the external magnetic type as described in patent document 1 and patent document 2 is often employed.

Here, the present inventors have repeatedly studied the combined use of such a configuration as the internal magnetic type and the external magnetic type in order to obtain a stronger magnetic flux density. When the internal magnet type and the external magnet type are used in combination, in order to provide a configuration in which the thickness of the entire magnetic circuit is suppressed, a configuration in which two magnets are in the same position in a positional relationship parallel to the magnetic gap and the magnetization directions thereof are opposite to each other is advantageous.

When such a configuration is adopted, the step of performing magnetization after assembling the entire speaker and the magnetic circuit is very difficult to perform. Therefore, at least one permanent magnet needs to be assembled after magnetization. Further, after assembling the diaphragm, the lead wire of the voice coil needs to be fixed to a terminal plate. However, the step of performing welding immediately after magnetization of the permanent magnet may cause a reduction in workability and a reduction in magnetic flux density due to demagnetization of the permanent magnet.

As a result of such examination, the present inventors have newly devised each of the above-described techniques. That is, the outer magnet 12 and the inner magnet 31 having different magnetization directions are disposed on the rear surface of the vibration plate 51. In this case, the outer assembly 10 including the outer magnets 12 and the inner assembly 30 including the inner magnets 31 are formed as separate bodies. This makes it possible to assemble after magnetizing the permanent magnet.

When two permanent magnets having different magnetization directions are provided, the magnetic circuit becomes strong and the sensitivity, low-range braking, and the like are improved as compared with the use of a single magnet. In addition, when an attempt is made to obtain the same magnetic force as in the case of using a single magnet, the magnetic gap can be widened, and the risk of abnormal noise of voice coil collision can be reduced. Further, when each magnet is thinned, the thickness and size of the speaker can be reduced while providing an equivalent magnetic flux density.

In addition, in a state before the inner assembly 30 is assembled, when a signal is inputted to the voice coil 52 from the outside, a sufficient space can be secured for performing an operation (such as formation, fixation, etc.) of the lead 55. Therefore, the lead wires 55 can be wired to the outside of the magnetic circuit from the opposite side of the vibration plate 51.

Therefore, workability for extracting the lead wire 55 is improved, and an excess length of the lead wire 55 can also be set appropriately. Therefore, when the wire is a spring, it is possible to optimize the strength and improve the sound quality. In addition, since the risk of contact with other components can be reduced, quality problems such as generation of abnormal noise and disconnection of the voice coil 52 can be suppressed.

Further, since a strong magnetic circuit can be realized by using the present technology, the amount (size) of the magnet required to realize a desired magnetic flux density can be reduced. Therefore, it is possible to increase the diameter of the through-hole 35 made by scraping the inner magnet 31, and thus to increase the design range of the through-hole 35. Therefore, the acoustics associated with the back pressure of the more appropriate vibration plate 51 can be adjusted, so that the acoustic characteristics can be improved.

The use of the present technology makes it possible to achieve further miniaturization of small-sized speakers such as earphones and headphones, improvement of acoustic characteristics, improvement of output characteristics, and the like. Of course, the present technique can be applied not only to small speakers but also to any medium-and large-sized speakers. For example, it is possible to realize a speaker having high acoustic characteristics and high output characteristics while having the same size as a speaker conventionally used.

< second embodiment >

A speaker according to a second embodiment of the present technology will be described. In the following description, description of configurations and effects similar to those in the speaker 100 described in the above embodiment will be omitted or simplified.

Fig. 8 is a schematic cross-sectional view showing a configuration example of the speaker 200 according to this embodiment. Fig. 9 is a schematic cross-sectional view respectively showing an outer assembly 210, an inner assembly 230, and a diaphragm assembly 250 included in the speaker 200.

In this embodiment, the diaphragm ring 253 of the vibrating plate assembly 250 is formed of a magnetic body and magnetized. That is, the diaphragm ring 253 is formed of a permanent magnet. The specific magnetic material and the like constituting the diaphragm ring 253 are not limited.

As shown in fig. 8, the diaphragm ring 253 is magnetized in a direction opposite to the direction of the outer magnets 212 in the axial direction of the reference axis C. That is, the diaphragm ring 253 is magnetized in the same direction as the inner magnet 231. The diaphragm ring 253 is then coupled to the upper side of the housing 211 of the outer assembly 210. In this embodiment, the diaphragm ring 253 corresponds to a support magnet.

For example, as a method of manufacturing the speaker 200 according to this embodiment, the vibration plate assembly 250, the outer assembly 210, and the inner assembly 230 shown in fig. 9 are formed, respectively. That is, the diaphragm ring 253 of the vibrating plate assembly 250, the outer magnets 212 of the outer assembly 210, and the inner magnets 231 of the inner assembly 230 are magnetized, respectively.

Then, the outer assembly 210 and the vibration plate assembly 250 are assembled, and then the inner assembly 230 is assembled. In each assembly step, a jig may be used for the purpose of preventing positional deviation. Note that, after the outer assembly 210 and the vibration plate assembly 250 are assembled, welding is performed.

Fig. 10 is a schematic diagram showing a magnetic flux density distribution in the magnetic gap. Fig. 10 shows a distribution of a part of one side (right side) on a cross section having a laterally symmetrical shape with reference to the reference axis C.

Fig. 10 a shows a loudspeaker 200 according to this embodiment and the distribution when a diaphragm ring 253 formed of permanent magnets is used. Fig. 10B shows the profile when diaphragm ring 290 formed of brass is used. The intensity of the magnetic flux density is indicated by gray shading in a and B of fig. 10. As the gray color becomes lighter (closer to white), the magnetic flux density increases.

As shown in fig. 10, the use of a diaphragm ring 253 formed of permanent magnets on the outer plate 213 makes it possible to further increase the magnetic flux in the magnetic gap. Further, the symmetry of the magnetic flux density distribution between the vibration plate 251 side (upper side) and the terminal plate 214 side (lower side) in the vicinity of the magnetic gap can be improved. Therefore, the magnetic flux density can be kept uniform throughout the movable range of the voice coil 252 that moves in the vertical direction.

< other examples >

The present technology is not limited to the embodiments described above, and various other embodiments may be implemented.

Fig. 11 is a schematic cross-sectional view showing a configuration example of a speaker according to another embodiment. As shown in a and B of fig. 11, the shape of the case 311 of the outer assembly 310 is formed to cover only the outer circumference side of the outer magnet 312. An outer yoke 329 for the outer magnet 312 may be provided on the lower side of the outer magnet 312. Therefore, the magnetic permeability between the yokes from the outer magnet 312 to the inner magnet 331 can be improved.

If the outer yoke 329 is provided as shown in a and B of fig. 11, the outer yoke 329 of the metal part is exposed to the outside when the outer assembly 310 is formed. Further, when the inner assembly 330 is formed, the inner yoke 333 of the metal part is exposed to the outside.

Accordingly, when the outer assembly 310 and the inner assembly 330 are assembled, the outer yoke 329 and the inner yoke 333 may be connected by welding. Accordingly, it is possible to increase the strength of the connection portion between the outer assembly 310 and the inner assembly 330 and to improve the durability of the speaker.

Note that in a and B of fig. 11, the outer yoke 329 and the inner yoke 333 are integrally shown in a state after being subjected to welding. That is, illustration of the welded portion is omitted. The position of the welded portion is not limited and may be arbitrarily designed. Of course, the method of connecting the outer yoke 329 and the inner yoke 333 is not limited to welding.

In addition, a portion serving as the outer yoke 329 after assembly may be provided to the inner yoke 333 in advance. That is, the outer yoke 329, which serves as a part of the outer yoke 329 after assembly, may be integrally formed with the inner yoke 333 on an outer peripheral side of the inner yoke 333 centered on the reference axis C.

Fig. 12 is a schematic diagram showing a magnetic flux density distribution in the magnetic gap. A of fig. 12 shows the distribution when the outer yoke 329 is used (the case 311 of the outer peripheral portion is not shown). B of fig. 12 shows the distribution when the outer yoke 329 is not used and the outer magnet 312 is supported by the housing 311.

As in a and B of fig. 10, the intensity of the magnetic flux density is indicated by gray shading. As the gray color becomes lighter (closer to white), the magnetic flux density increases.

As shown in fig. 12, the use of the outer yoke 329 makes it possible to further increase the magnetic flux in the magnetic gap. Further, the magnetic flux density in the vicinity of the magnetic gap can be kept uniform.

Fig. 13 is a schematic diagram showing a configuration example of a speaker unit 400 according to another embodiment. As shown in fig. 13, the outer magnet 412 may also be provided to be shared by a plurality of inner magnets 431.

For example, a plurality of holes 471 are formed in the plate-shaped magnet member 470. An inner magnet 431 is provided for each hole 471 so as to form a magnetic gap MG. A voice coil (not shown) is disposed in the magnetic gap between the hole 471 and the inner magnet 431. Therefore, the number of the holes 471, the number of the inner magnets 431, and the number of the voice coils are equal to each other.

The plate-shaped magnet part 470 serves as the outer magnet 412 described above for each inner magnet 431. The use of the present technology makes it possible to easily realize the speaker unit 400 including a plurality of voice coils and having a planar shape. Further, when the magnet member 470 is obtained using a bendable member, the speaker unit 400 may also be mounted on a curved surface.

Of course, a magnetic member serving as an outer plate or an outer yoke may be added to the plate-shaped magnet member 470. Alternatively, the plate-shaped magnet member 470 may perform the functions of the outer plate and the outer yoke.

A single vibration plate may be used as the vibration plate. That is, a single diaphragm may be shared by a plurality of voice coils. Alternatively, a vibration plate may be provided for each voice coil.

All the characteristics of the inner magnets 431 provided in the respective holes 471 may be different. Further, all the winding diameters of the voice coils disposed in the respective holes 471 and the like may not be the same. That is, speakers having different output characteristics and acoustic characteristics may be respectively disposed in the corresponding holes 471.

Further, the inner magnet 431 and the voice coil do not necessarily need to be disposed at equal intervals, and for example, the inner magnet 431 and the voice coil are disposed in a shape matching the natural vibration of the vibration plate. That is, a desired number of speakers having desired characteristics may be configured at desired positions.

As shown in fig. 1 and the like in the above description, a through hole 35 extending in the axial direction is formed in the inner assembly 30. The present technique is not so limited. The present technique is applicable even when the through hole 35 is not formed. For example, the present technology is applicable even when the inner magnet 31 having a disk shape instead of a ring shape is used.

In the above description, a case where the lead wire of the voice coil is drawn out to the outside from the side opposite to the side to which the diaphragm assembly is connected has been taken as an example. The present technique is not so limited. The lead wire of the voice coil may be drawn out from the side connected to the diaphragm.

Each configuration of the speaker, the outer assembly, the inner assembly, the vibrating plate assembly, and the like, each step of the method of manufacturing the speaker, and the like described with reference to the drawings is only one embodiment, and any modification may be made without departing from the scope of the present technology. That is, any other configuration, other method, etc. for performing the present techniques may be employed.

In the present disclosure, concepts of defining shapes, sizes, positional relationships, states, and the like, such as "central", "uniform", "equal", "same", "orthogonal", "parallel", "symmetrical", "extending", "axial", "columnar", "cylindrical", "annular shape", and "annular" include concepts including "substantially central", "substantially uniform", "substantially equal", "substantially identical", "substantially orthogonal", "substantially parallel", "substantially symmetrical", "substantially extending", "substantially axial", "substantially columnar", "substantially cylindrical", "substantially annular shape", and the like.

For example, states included in a predetermined range (e.g., a ± 10% range) based on "perfectly centered", "perfectly even", "perfectly equal", "perfectly orthogonal", "perfectly parallel", "perfectly symmetrical", "perfectly extended", "perfectly axial", "perfectly cylindrical", "perfectly annular", and the like are also included.

At least two of the characteristic parts according to the present technology described above may be combined. That is, various characteristic portions described in the embodiments may be arbitrarily combined without distinguishing the embodiments. Further, the various effects described above are not restrictive, but merely illustrative, and other effects may be provided.

Note that the present technology may also adopt the following configuration.

(1) A loudspeaker, comprising:

an outer magnet having a ring shape and magnetized in an axial direction of the ring shape; and

an inner magnet having a circular outer shape when viewed from an axial direction of the outer magnet, magnetized in an axial direction in a direction opposite to a direction of the outer magnet, and disposed inside the outer magnet through a gap.

(2) The loudspeaker according to (1), characterized in that

The inner magnet has a ring shape having an axial direction equal to that of the outer magnet.

(3) The speaker according to (2), further comprising:

an outer part portion comprising an outer magnet;

an inner part including an inner magnet and forming a magnetic gap with the outer part; and

and a diaphragm component part including a diaphragm and a coil disposed in the magnetic gap.

(4) The loudspeaker according to (3), characterized in that

The outer part has an opening which opens perpendicularly to the axial direction and has a larger diameter than the outer diameter of the inner magnet, an

The inner magnet is inserted into the opening and fixed.

(5) The loudspeaker according to (4), characterized in that

When the side of the vibrating plate member portion connected to the outer member portion in the axial direction is the first side, and the side opposite to the first side is the second side,

the opening is formed on the second side of the outer member portion.

(6) The loudspeaker according to (4) or (5), characterized in that

The lead wire of the coil is drawn out to the outside through the opening.

(7) The speaker according to any one of (3) to (6), characterized in that

The position of the central axis of the outer magnet, the position of the central axis of the inner magnet, and the position of the central axis of the coil are configured to be equal to each other, an

The inner part portion comprises a through hole extending in the axial direction at the location of the central axis of the inner magnet.

(8) The speaker according to any one of (3) to (7), characterized in that

When the side of the vibrating plate member portion connected to the outer member portion in the axial direction is the first side, and the side opposite to the first side is the second side,

the inner piece portion includes an inner yoke magnetically coupled to a second side of the inner magnet.

(9) The speaker according to (8), characterized in that

The inner yoke includes a first portion corresponding to the coil and a second portion corresponding to the inner magnet when viewed from the axial direction, and

the thickness of the first portion is less than the thickness of the second portion.

(10) The loudspeaker according to (8) or (9), characterized in that

The outer component portion includes an outer yoke magnetically connected to a second side of the outer magnet.

(11) The loudspeaker according to (10), characterized in that

The inner yoke and the outer yoke are connected to each other by welding.

(12) The speaker according to (3) to (11), characterized in that

The vibrating plate part portion includes a support magnet that supports the vibrating plate and is magnetized in a direction opposite to a direction of the outer magnet in the axial direction.

(13) A method of manufacturing a loudspeaker, the method comprising:

forming an outer member portion including an outer magnet having a ring shape and magnetized in an axial direction of the ring shape;

forming an inner part portion including an inner magnet having a circular outer shape with a diameter smaller than an inner diameter of the outer magnet and magnetized in an axial direction of the circular shape; and

the outer member portion and the inner member portion are assembled such that the inner magnet is disposed inside the outer magnet through a gap and such that the magnetization directions of the outer magnet and the inner magnet are opposite to each other.

(14) The method of manufacturing a speaker according to (13), characterized in that

The inner magnet has a ring shape with a diameter smaller than that of the outer magnet, an

Forming the inner piece portion includes forming a through hole extending in the axial direction at a position of a central axis of the inner magnet.

(15) The method for manufacturing a speaker according to (13) or (14), characterized in that

Assembling the outer member portion and the inner member portion includes inserting the inner magnet into an opening formed on a side opposite to a side of the outer member portion connected to the vibration plate member portion including the coil and the vibration plate.

(16) The method of manufacturing a speaker according to any one of (13) to (15), characterized in that

Assembling the outer member portion and the inner member portion includes supporting at least one of the outer member portion and the inner member portion by a jig for equalizing an axial direction of the outer magnet and an axial direction of the inner magnet.

(17) The method of manufacturing a speaker according to any one of (13) to (16), the method further comprising:

forming a diaphragm part including a coil and a diaphragm; and

the outer member portion, the inner member portion, and the vibrating plate member portion are assembled such that the coil is disposed in the magnetic gap between the outer member portion and the inner member portion.

(18) The method of manufacturing a speaker according to any one of (13) to (17), the method further comprising:

forming a diaphragm part including a coil and a diaphragm, characterized in that

Forming the outer member portion includes

Assembling the unmagnetized exterior part and the vibrating plate part, an

After the unmagnetized outer member portion and the vibration plate member portion are assembled, the unmagnetized outer magnet is magnetized, and

assembling the outer part and the inner part comprises

The inner part portion is assembled to the outer part portion assembled with the vibrating plate part portion such that the coil is disposed in the magnetic gap between the outer part portion and the inner part portion.

(19) The method of manufacturing a speaker according to (18), characterized in that

Forming the outer member portion includes

The lead wires of the coil of the vibrating plate part portion are fixed by welding between the assembly of the unmagnetized outer member portion and the vibrating plate part portion and the magnetized unmagnetized outer magnet.

(20) The method of manufacturing a speaker according to (17), characterized in that

When the side of the vibrating plate member portion connected to the outer member portion is the first side, and the side opposite to the first side is the second side,

forming the outer member portion includes disposing an outer yoke on a second side of the outer magnet,

forming the inner part portion includes arranging the inner yoke on a second side of the inner magnet, an

Assembling the outer member portion and the inner member portion includes connecting the outer yoke and the inner yoke to each other by welding.

List of reference signs

C reference axis

G1, G2 gap

MG magnetic gap

10. 210, 310 outer component

12. 212, 312, 412 magnets

17 opening

20 unmagnetized outer magnet (ferrimagnet)

25 unmagnetized outer component

30. 230, 330 inner component

31. 231, 331, 431 inner magnet 33, 333 inner yoke 35 through hole

50. 250 diaphragm assembly 51, 251 diaphragm 52, 252 voice coil 53, 253 diaphragm ring 60 clamp

100. 200 speaker 329 outer yoke 400 speaker unit.