JP3891481B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker.
[0002]
[Prior art]
When a speaker is installed in a personal computer, multimedia portable device, or the like, the installation location of the speaker is an elongated area such as both sides or a lower stage of a video screen of the personal computer, multimedia portable device, or the like. Therefore, the shape of the speaker is preferably an elongated shape such as a rectangle or an ellipse.
[0003]
For example, a conventional speaker 1200 is described in JP-A-10-191494. In the following, a conventional speaker 1200 is described with reference to FIGS. 12a and 12b.
[0004]
FIG. 12 a shows the top surface of a conventional speaker 1200. FIG. 12 b shows a cross-section at A-A ′ of the conventional speaker 1200.
[0005]
Speaker 1200 is coupled to frame 1201, magnetic circuit 1206 fixed to frame 1201, diaphragm 1203 fixed to the frame so as to vibrate in the direction of arrow P shown in FIG. 12b, and diaphragm 1203. It includes a driving force transmission member 1204 and a damper 1205 that supports the driving force transmission member 1204. An outer peripheral portion of the diaphragm 1203 is fixed to the frame 1201 via an edge 1202.
[0006]
One end of the damper 1205 is coupled to the driving force transmission member 1204 above the magnetic circuit 1206, and the other end of the damper 1205 is coupled to the frame 1201 above the magnetic circuit 1206.
[0007]
The driving force transmission member 1204 has a region where the voice coil 1207 is formed. When a drive current flows through the voice coil 1207, a drive force is generated in the direction of arrow P shown in FIG. 12b due to the action of the drive current and the magnetic flux provided by the magnetic circuit 1206. The driving force transmission member 1204 is configured to transmit this driving force to the diaphragm 1203. Due to this driving force, the diaphragm 1203 vibrates in the direction of the arrow P. As a result, sound is generated.
[0008]
[Problems to be solved by the invention]
However, according to the conventional speaker 1200, the thickness of the speaker 1200 is required to be at least the thickness of the magnetic circuit 1206, the thickness of the damper 1205, and the thickness of the diaphragm 1203. This is because a damper is provided above the magnetic circuit.
[0009]
The present invention has been made in view of the above problems, and provides a speaker that is thinned at least by the thickness of the damper as compared with a conventional speaker in which a damper is provided above a magnetic circuit. For the purpose.
[0010]
It is another object of the present invention to provide a magnetic circuit with high speaker driving efficiency.
[0011]
[Means for Solving the Problems]
A speaker according to the present invention includes a frame, a magnetic circuit fixed to the frame, a diaphragm fixed to the frame so as to vibrate in a predetermined direction, and a driving force transmission member coupled to the diaphragm. And a damper that supports the driving force transmission member, wherein the magnetic circuit is disposed between a first plane and a second plane, and the first plane is parallel to the diaphragm. A plane that is in contact with at least a portion of the magnetic circuit, and the second plane is a plane that is parallel to the diaphragm and that is in contact with at least a portion of the magnetic circuit. The driving force transmission member has a region where a voice coil is formed, and the driving force transmission member acts between a current flowing in the voice coil and a magnetic flux provided by the magnetic circuit. By The generated driving force in the predetermined direction is transmitted to the diaphragm, and one end of the damper is transmitted at a position between the first plane and the second plane. The other end of the damper is coupled to the frame at a position between the first plane and the second plane, thereby achieving the above object.
[0012]
The magnetic circuit may be disposed inside the frame.
[0013]
The diaphragm may have a recess, and the driving force transmission member may be coupled to the recess of the diaphragm.
[0014]
The frame may have a recess, and at least a part of the magnetic circuit may be embedded in the recess of the frame.
[0015]
The magnetic circuit may have a protrusion, and the frame may have a portion coupled to the protrusion.
[0016]
The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and the first magnetic circuit unit, the frame includes a first frame plate to which the first magnetic circuit unit is fixed, and the second magnetic circuit unit. A second frame plate having a magnetic circuit portion fixed thereto, a third frame plate, and a fourth frame plate, wherein one end of the third frame plate is coupled to one end of the first frame plate; The other end of the third frame plate is coupled to one end of the second frame plate, the one end of the fourth frame plate is coupled to the other end of the first frame plate, and the other end of the fourth frame plate. May be coupled to the other end of the second frame plate.
[0017]
The frame may further include a bottom plate.
[0018]
The driving force transmitting member may have at least one through hole in a region other than the region where the voice coil is formed.
[0019]
The driving force transmission member may be formed by bonding a core member having at least one through hole and a surface member having a region where the voice coil is formed.
[0020]
The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and a magnetic air gap defined by the first magnetic circuit unit and the second magnetic circuit unit, and the first magnetic circuit unit includes: A rectangular parallelepiped first magnet, a first plate fixed to the upper surface of the first magnet, and a second plate fixed to the lower surface of the first magnet, wherein the second magnetic circuit portion is A rectangular parallelepiped second magnet, a third plate fixed to the upper surface of the second magnet, and a fourth plate fixed to the lower surface of the second magnet. One end is coupled to the frame, one end of the second magnetic circuit unit is coupled to the frame, and the first magnet and the second magnet face each other with opposite polarities, and the magnetic gap is A first magnet defined by the first plate and the third plate; A second magnetic space defined by a first magnetic air gap through which the magnetic flux generated from the first magnet and the second magnet passes, and the second plate and the fourth plate. The magnetic gap may include a second magnetic gap through which the magnetic flux generated from the first magnet and the second magnet passes.
[0021]
The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and a magnetic air gap defined by the first magnetic circuit unit and the second magnetic circuit unit, and the first magnetic circuit unit includes: A rectangular parallelepiped magnet, a first plate fixed to the upper surface of the magnet, and a second plate fixed to the lower surface of the magnet, the second magnetic circuit unit including a yoke, and the first magnetic One end of the circuit unit is coupled to the frame, one end of the second magnetic circuit unit is coupled to the frame, the magnet and the yoke are opposed to each other, and the magnetic gap is formed between the first plate and the yoke. A first magnetic air gap defined by the first magnetic air gap through which the magnetic flux generated from the magnet passes, and a second magnetic air gap defined by the second plate and the yoke. Generated from the magnet The magnetic flux may include a second magnetic gap that passes through the. At least a part of the first plate may be in contact with the opposing yoke, and at least a part of the second plate may be in contact with the opposing yoke.
[0022]
The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and a magnetic air gap defined by the first magnetic circuit unit and the second magnetic circuit unit, and the first magnetic circuit unit includes: A rectangular parallelepiped first magnet, a rectangular parallelepiped second magnet, a first plate, and a second plate, wherein the second magnetic circuit portion includes a yoke, and one end of the first plate. Is coupled to the frame, the other end of the first plate is coupled to the first magnet, one end of the second plate is coupled to the frame, and the other end of the second plate is the first plate. The first magnet and the yoke face each other, the second magnet and the yoke face each other, and the first magnet and the second magnet are opposite to each other. The magnetic gap is fixed in the predetermined direction in a polar state A first magnetic air gap defined by the first plate and the yoke through which the magnetic flux generated from the first magnet passes; the second plate; And a second magnetic air gap defined by the yoke, through which the magnetic flux generated from the second magnet passes.
[0023]
The speaker of the present invention includes a frame, a magnetic circuit fixed to the frame, a diaphragm fixed to the frame so as to vibrate in a predetermined direction, and a driving force transmission member coupled to the diaphragm. And a damper that supports the driving force transmission member, wherein the magnetic circuit is disposed between a first plane and a second plane, and the first plane is parallel to the diaphragm. A plane that is in contact with at least a portion of the magnetic circuit, and the second plane is a plane that is parallel to the diaphragm and that is in contact with at least a portion of the magnetic circuit. The driving force transmission member has a region where a voice coil is formed, and the driving force transmission member acts between a current flowing in the voice coil and a magnetic flux provided by the magnetic circuit. Due to The driving force in the predetermined direction is transmitted to the diaphragm, and the magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, the first magnetic circuit unit, and the first magnetic circuit unit. A magnetic gap defined by two magnetic circuit portions, wherein the first magnetic circuit portion is a rectangular parallelepiped magnet, a first plate fixed to the upper surface of the magnet, and a second fixed to the lower surface of the magnet. The second magnetic circuit unit includes a yoke, one end of the first magnetic circuit unit is coupled to the frame, one end of the second magnetic circuit unit is coupled to the frame, and the magnet And the yoke are opposed to each other, and the magnetic gap is a first magnetic gap defined by the first plate and the yoke, and a first magnetic field through which the magnetic flux generated from the magnet passes. Gap and the second plate And a second magnetic gap that the magnetic flux generated from the magnet and a second magnetic gap defined by said yoke passes, thereby the object can be achieved.
[0024]
In the speaker of the present invention, at least a part of the first plate may be in contact with the opposing yoke, and at least a part of the second plate may be in contact with the opposing yoke.
[0025]
The speaker of the present invention includes a frame, a magnetic circuit fixed to the frame, a diaphragm fixed to the frame so as to vibrate in a predetermined direction, and a driving force transmission member coupled to the diaphragm. And a damper that supports the driving force transmission member, wherein the magnetic circuit is disposed between a first plane and a second plane, and the first plane is parallel to the diaphragm. A plane that is in contact with at least a portion of the magnetic circuit, and the second plane is a plane that is parallel to the diaphragm and that is in contact with at least a portion of the magnetic circuit. The driving force transmission member has a region where a voice coil is formed, and the driving force transmission member acts between a current flowing in the voice coil and a magnetic flux provided by the magnetic circuit. Due to The driving force in the predetermined direction is transmitted to the diaphragm, and the magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, the first magnetic circuit unit, and the first magnetic circuit unit. A magnetic gap defined by two magnetic circuit portions, wherein the first magnetic circuit portion includes a first rectangular magnet, a second rectangular magnet, a first plate, and a second plate. The second magnetic circuit unit includes a yoke, one end of the first plate is coupled to the frame, the other end of the first plate is coupled to the first magnet, and the second One end of the plate is coupled to the frame, the other end of the second plate is coupled to the second magnet, the first magnet and the yoke face each other, the second magnet and the The yoke is opposed to each other, and the first magnet and the second magnet Are fixed side by side in the predetermined direction with opposite polarities, and the magnetic air gap is a first magnetic air gap defined by the first plate and the yoke and is generated from the first magnet. A second magnetic air gap defined by the first magnetic air gap through which the magnetic flux passed, the second plate and the yoke passes, and through which the magnetic flux generated from the second magnet passes. And the above object is achieved.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0027]
1. Speaker structure of the present invention
FIG. 1a shows an upper surface of the speaker 100 according to the embodiment of the present invention. FIG. 1 b shows a cross section taken along the line A-A ′ of the speaker 100 according to the embodiment of the present invention. FIG. 1c shows a cross section taken along the line B-B 'of the speaker 100 according to the embodiment of the present invention. FIG. 1d shows a perspective view of the speaker 100 according to the embodiment of the present invention.
[0028]
Speaker 100 is coupled to frame 101, magnetic circuit 106 fixed to frame 101, diaphragm 103 fixed to frame 101 so as to vibrate in the direction of arrow P shown in FIG. 1, and diaphragm 103. And a damper 105 that supports the driving force transmission member 104. The outer peripheral portion of the diaphragm 103 is fixed to the frame 101 via the edge 102.
[0029]
The magnetic circuit 106 is disposed between the first plane and the second plane.
[0030]
Here, in this specification, the “first plane” is defined as “a plane parallel to the diaphragm and in contact with at least a part of the magnetic circuit”. The “second plane” is defined as “a plane parallel to the diaphragm and in contact with at least a part of the magnetic circuit”.
[0031]
One end of the damper 105 is coupled to the driving force transmission member 104 at a position between the first plane and the second plane. The other end of the damper 105 is coupled to the frame 101 at a position between the first plane and the second plane.
[0032]
For example, as shown in FIG. 1, when the magnetic circuit 106 is a rectangular parallelepiped and the magnetic circuit 106 is fixed to the frame 101 so that the upper surface I and the lower surface II of the magnetic circuit 106 are parallel to the diaphragm 103, One plane is the upper surface I of the magnetic circuit 106, and the second plane is the lower surface II of the magnetic circuit 106.
Thus, by arranging the magnetic circuit 106 and the damper 105, the mounting position of the damper 105 does not exceed or fall below the mounting position of the magnetic circuit 106. As a result, the speaker 100 can be made thinner by at least the thickness of the damper 105 compared to a conventional speaker in which a damper is provided above the magnetic circuit.
[0033]
Furthermore, by arranging the magnetic circuit 106 inside the frame 101, the speaker 100 can be further reduced in thickness. This is because the attachment position of the magnetic circuit 106 does not exceed or fall below the position of the frame 101.
[0034]
In the example shown in FIG. 1, the magnetic circuit 106 is configured to include a magnetic circuit unit 106a, a magnetic circuit unit 106b, and a magnetic gap 110 defined by the magnetic circuit unit 106a and the magnetic circuit unit 106b. Yes.
[0035]
The magnetic circuit unit 106a includes a rectangular parallelepiped (for example, square bar-shaped) magnet 108a, a plate 109a that is a plane fixed to the upper surface of the magnet 108a, and a plate 109b that is a plane fixed to the lower surface of the magnet 108a.
[0036]
The magnetic circuit unit 106b includes a rectangular parallelepiped (for example, rectangular bar-shaped) magnet 108b, a plate 109c that is a plane fixed to the upper surface of the magnet 108b, and a plate 109d that is a plane fixed to the lower surface of the magnet 108b.
[0037]
One end of the magnetic circuit unit 106 a is coupled to the flat surface of the frame 101. One end of the magnetic circuit unit 106 b is coupled to the flat surface of the frame 101. The magnet 108a and the magnet 108b are opposed so as to have opposite polarities.
[0038]
The magnetic air gap 110 includes a magnetic air gap 110a and a magnetic air gap 110b.
[0039]
The magnetic gap 110a is defined by the plate 109a and the plate 109c, and is a gap through which the magnetic flux generated from the magnet 108a and the magnet 108b passes. The magnetic gap 110b is defined by the plate 109b and the plate 109d, and is a gap through which the magnetic flux generated from the magnet 108a and the magnet 108b passes.
[0040]
FIG. 2 is a perspective view of the driving force transmission member 104.
[0041]
The driving force transmission member 104 has a region where the voice coil 107 is formed. The driving force transmission member 104 is installed so that the region where the voice coil 107 is formed is disposed in the magnetic gap 110.
[0042]
The voice coil 107 is, for example, a thin printed coil that is formed by winding a rectangular ring around both sides of the driving force transmission member 104.
[0043]
When a driving current flows through the voice coil 107, a driving force is generated in the direction of arrow P shown in FIG. The driving force transmission member 104 is configured to transmit this driving force to the diaphragm 103. With this driving force, the diaphragm 103 vibrates in the direction of the arrow P. As a result, sound is generated.
[0044]
The shape of the magnetic circuit 106 is not limited to a rectangular parallelepiped. The magnetic circuit 106 can have any shape. Even in this case, the speaker 100 can be thinned by disposing the magnetic circuit 106 and the damper 105 between the first plane and the second plane.
[0045]
With the above-described configuration, for example, the thin speaker 100 having a length of 65 mm, a width of 14 mm, and a height of 10 mm can be realized. The diaphragm 103 is, for example, an elongated flat plate (the horizontal length is 56 mm and the vertical length is 7 mm). The driving force transmission member 104 is, for example, a flat plate (thickness 0.3 mm) made of glass fiber reinforced resin.
[0046]
Hereinafter, variations of the present invention will be described.
[0047]
2. Use of diaphragms with recesses
The shape of the diaphragm 103 is not limited to a flat plate. The diaphragm 103 has, for example, a recess, and the driving force transmission member 104 can be coupled to the recess of the diaphragm 103.
[0048]
FIG. 3a shows the upper surface of the speaker 100 using the diaphragm 103a having a recess. FIG. 3b shows a cross-section at A-A 'of the speaker 100 using the diaphragm 103a having a recess. FIG. 3c shows a cross-section at B-B 'of the speaker 100 using the diaphragm 103a having a recess.
[0049]
The cross section of the diaphragm 103a has a corrugated shape. The diaphragm 103a has a recess, and the driving force transmission member 104 is coupled to the recess of the diaphragm 103a. A narrow hole penetrating the concave portion of the diaphragm 103a is made, and the driving force transmitting member 104 is inserted into the narrow hole and fixed with an adhesive.
[0050]
As described above, according to the speaker of the present invention, the driving force transmission member is coupled to the concave portion of the diaphragm. Therefore, it is possible to provide a speaker in which the adhesive accumulates in the recess and the strength of the joint is high.
[0051]
3. Use of frames with recesses
It is not essential that one end of the magnetic circuit unit 106 is coupled to the flat surface of the frame 101. The frame has a recess, and at least a part of the magnetic circuit may be embedded in the recess of the frame. Further, it is not essential for the frame 101 to be manufactured integrally with four frame plates. The frame 101 may be manufactured by assembling four frame plates.
[0052]
FIG. 4a shows the upper surface of the speaker using the frame plate 101a and the frame plate 101b having recesses. FIG. 4B shows a cross section taken along the line A-A 'of the speaker using the frame plate 101a having a recess and the frame plate 101b. FIG. 4c shows a perspective view of a speaker using the frame plate 101a having a recess and the frame plate 101b.
[0053]
The magnetic circuit 106 includes a magnetic circuit unit 106a and a magnetic circuit unit 106b.
[0054]
The frame 101 includes a frame plate 101a to which the magnetic circuit unit 106a is fixed, a frame plate 101b to which the magnetic circuit unit 106b is fixed, a frame plate 101c, and a frame plate 101d.
[0055]
One end of the frame plate 101c is coupled to one end of the frame plate 101a, and the other end of the frame plate 101c is coupled to one end of the frame plate 101b.
[0056]
One end of the frame plate 101d is coupled to the other end of the frame plate 101a, and the other end of the frame plate 101d is coupled to the other end of the frame plate 101b.
[0057]
The frame 101a has a recess, and a part of the magnetic circuit 106a is embedded in the recess of the frame 101a. The frame 101b has a recess, and a part of the magnetic circuit 106b is embedded in the recess of the frame 101b.
[0058]
Since the magnet 108a and the magnet 108b face each other so as to have opposite polarities, a strong force (attraction force) is always applied to the magnet 108a and the magnet 108b in the attracting direction. In addition, the speaker 100 may be deformed due to a heat change.
[0059]
As described above, according to the speaker of the present invention, the bonding area between the magnetic circuit unit 106a and the frame 101a is increased, so that the bonding strength is improved. Since the adhesion area between the magnetic circuit portion 106b and the frame 101b is increased, the adhesion strength is improved. Therefore, the risk that the magnetic circuit unit 106a and the frame 101a are detached due to the attractive force or due to thermal change is greatly reduced. The risk of the magnetic circuit portion 106b and the frame 101b coming off due to the attractive force and due to thermal changes is greatly reduced.
[0060]
Furthermore, as described above, according to the speaker of the present invention, since the frame is manufactured by assembling four frame plates, the manufacture and assembly of the magnetic circuit is facilitated.
[0061]
4). Use of magnetic circuits with protrusions
The shape of the upper surface and the lower surface of the magnetic circuit 106 is not limited to a plane. The upper surface of the magnetic circuit or the lower surface of the magnetic circuit may have a protrusion, and the frame may have a portion that is coupled to the protrusion of the magnetic circuit.
[0062]
FIG. 5a shows the top surface of a loudspeaker using a magnetic circuit with protrusions. FIG. 5b shows a cross-section at A-A 'of a speaker using a magnetic circuit having protrusions. FIG. 5c is a perspective view of a speaker using a magnetic circuit having protrusions.
[0063]
The plate 109a fixed to the upper surface of the magnet 108a has a protrusion. The frame 101 has a portion that is coupled to the protrusions of the plate 109a. The plate 109b fixed to the lower surface of the magnet 108a has a protrusion. The frame 101 has a portion that is coupled to the protrusions of the plate 109b. The plate 109c fixed to the upper surface of the magnet 108b has a protrusion. The frame 101 has a portion that is coupled to the protrusions of the plate 109c. The plate 109d fixed to the lower surface of the magnet 108b has a protrusion. The frame 101 has a portion that is coupled to the protrusions of the plate 109d.
[0064]
Since the magnet 108a and the magnet 108b face each other so as to have opposite polarities, a strong force (attraction force) is always applied to the magnet 108a and the magnet 108b in the attracting direction. In addition, the speaker 100 may be deformed due to a heat change.
[0065]
As described above, according to the speaker of the present invention, the bonding area between the magnetic circuit unit 106a and the frame 101a is increased, so that the bonding strength is improved. Since the adhesion area between the magnetic circuit portion 106b and the frame 101b is increased, the adhesion strength is improved. Therefore, the risk that the magnetic circuit unit 106a and the frame 101a are detached due to the attractive force or due to thermal change is greatly reduced. The risk of the magnetic circuit portion 106b and the frame 101b coming off due to the attractive force and due to thermal changes is greatly reduced.
[0066]
5. Use of frame with bottom plate
The configuration of the frame 101 is not limited to four (frame plates 101a to 101d). The frame 101 may further include a bottom plate 101e.
[0067]
FIG. 6a shows the top surface of the speaker 100 having a bottom plate 101e. FIG. 6B shows a cross section taken along line A-A 'of the speaker 100 having the bottom plate 101e. FIG. 6c is a perspective view of the speaker 100 having the bottom plate 101e.
[0068]
By assembling the frame 101 with five plates including the bottom plate 101e, the strength of the structure of the speaker 100 can be further increased.
[0069]
6). Use of driving force transmission member with through hole
The driving force transmission member 104 may have a through hole in a region other than the region where the voice coil 107 is formed.
[0070]
FIG. 7 is a perspective view of the driving force transmission member 104a having a through hole.
[0071]
The driving force transmission member 104a has a through hole 104b and a through hole 104c. The sizes of the through hole 104b and the through hole 104c are, for example, rectangles each having a width of 16 mm and a length of 2 mm.
[0072]
A through hole 104b and a through hole 104c are provided in the driving force transmission member 104a so as not to reduce the driving force transmission efficiency. Since the driving force transmission member 104a becomes light, the driving efficiency of the speaker is improved.
[0073]
7). Utilization of driving force transmission members composed of composite substrates
The configuration of the driving force transmission member 104a is not limited to a single plate. The driving force transmission member 104a can be composed of a composite substrate.
[0074]
FIG. 8 is a perspective view of the driving force transmission member 104a 'composed of the composite substrate.
[0075]
The driving force transmission member 104a ′ includes a core member 104d having at least one through hole, a surface member 104e having a region where the voice coil 107 is formed, and a surface member 104f having a region where the voice coil 107 is formed. It is formed by pasting together.
[0076]
The surface member 104e and the surface member 104f are, for example, sheets made of glass fiber composite resin.
[0077]
The driving force transmission member 104a 'is composed of a composite substrate including a lightweight surface member and a highly rigid core member. Therefore, it is possible to obtain a driving force transmission member that is lighter and more rigid than a single plate.
[0078]
8). Use of magnetic circuit with one magnet
The configuration of the magnetic circuit is not limited to having two magnets. The number of magnets used in the magnetic circuit may be one.
[0079]
FIG. 9a shows the top surface of the speaker 100 using a magnetic circuit having one magnet. FIG. 9b shows a cross-section at A-A 'of the speaker 100 using a magnetic circuit having one magnet. FIG. 9 c shows a cross-section at B-B ′ of the speaker 100 using a magnetic circuit having one magnet. FIG. 9d shows a perspective view of the speaker 100 using a magnetic circuit having one magnet.
[0080]
The magnetic circuit 106 is configured to include a magnetic circuit unit 106c, a magnetic circuit unit 106d, and a magnetic gap 110 'defined by the magnetic circuit unit 106c and the magnetic circuit unit 106d.
[0081]
The magnetic circuit unit 106c includes a rectangular parallelepiped (for example, square bar-shaped) magnet 108c, a plate 109e fixed to the upper surface of the magnet 108c, and a plate 109f fixed to the lower surface of the magnet 108c.
[0082]
The magnetic circuit unit 106d includes a yoke 111a.
[0083]
One end of the magnetic circuit unit 106 c is coupled to the frame 101. One end of the magnetic circuit unit 106 d is coupled to the frame 101. The magnet 108c and the yoke 111a are opposed to each other.
[0084]
The magnetic air gap 110 includes a magnetic air gap 110a 'and a magnetic air gap 110b'. The magnetic gap 110a 'is defined by the plate 109e and the yoke 111a, and is a gap through which the magnetic flux generated from the magnet 108c passes. The magnetic gap 110b 'is defined by the plate 109f and the yoke 111a, and is a gap through which the magnetic flux generated from the magnet 108c passes.
[0085]
The magnetic flux generated from the magnet 108c enters the yoke 111a via the magnetic gap 110a 'via the plate 109e, for example.
[0086]
The magnetic circuit 106d includes a yoke 111a instead of one magnet and two plates. Therefore, the cost can be reduced. In addition, the attachment position of a damper is not ask | required. For example, the mounting position of the damper may be higher than the mounting position of the magnetic circuit. The mounting position of the damper may be lower than the mounting position of the magnetic circuit. If the magnetic circuit 106d includes a yoke 111a instead of one magnet and two plates, the cost can be reduced.
[0087]
A part of the plate 109e may be in contact with the opposing yoke 111a. Further, a part of the plate 109f may be in contact with the opposing yoke 111a.
[0088]
FIG. 10a shows the top surface of a loudspeaker using a plate with a portion of the plate in contact with the opposing yoke. FIG. 10b shows a cross-section at A-A 'of a loudspeaker using a plate with a portion of the plate in contact with the opposing yoke. FIG. 10 c shows a cross-section at B-B ′ of a speaker using a plate in which a part of the plate is in contact with the opposing yoke.
[0089]
The plate 109g fixed to the upper surface of the magnet 108c has a convex portion 109g ′ and a convex portion 109g ″ in contact with the yoke 111a. The plate 109h fixed to the lower surface of the magnet 108c has a convex portion 109h ′ and a convex portion 109h ″ in contact with the yoke 111a. The cross-sectional areas of the protrusions 109g ', 109g ", 109h" and 109h "are wide enough to saturate the magnetic flux. Therefore, almost no magnetic flux passes through the yoke 111a from the plate 109g through the convex portions 109g 'and 109g' '. A decrease in the magnetic flux density of the magnetic gap is reduced, and the magnetic gap can be stably held.
[0090]
In addition, the attachment position of a damper is not ask | required. For example, the mounting position of the damper may be higher than the mounting position of the magnetic circuit. The mounting position of the damper may be lower than the mounting position of the magnetic circuit. If a part of the plate 109e is in contact with the opposing yoke 111a, or if a part of the plate 109f is in contact with the opposing yoke 111a, the decrease in the magnetic flux density of the magnetic gap is reduced and the magnetic The gap can be stably held.
[0091]
9. Use of a magnetic circuit having a magnetic circuit part in which magnets are arranged above and below
The configuration of the magnetic circuit is not limited to arranging two magnets facing each other. The configuration of the magnetic circuit may be a configuration in which two magnets are arranged one above the other.
[0092]
FIG. 11a shows the upper surface of a speaker using a magnetic circuit having a magnetic circuit part with magnets arranged one above the other. FIG. 11 b shows a cross-section at A-A ′ of a speaker using a magnetic circuit having a magnetic circuit section in which magnets are arranged one above the other. FIG. 11 c shows a cross-section at B-B ′ of a speaker using a magnetic circuit having a magnetic circuit section in which magnets are arranged one above the other.
[0093]
The magnetic circuit 106 is configured to include a magnetic circuit unit 106e, a magnetic circuit unit 106f, and a magnetic air gap 110 defined by the magnetic circuit unit 106e and the magnetic circuit unit 106f.
[0094]
The magnetic circuit unit 106e includes a rectangular parallelepiped magnet 108d, a rectangular parallelepiped magnet 108e, a plate 109i, and a plate 109j. The magnetic circuit unit 106f includes a yoke 111b.
[0095]
One end of the plate 109i is coupled to the frame 101, and the other end of the plate 109i is coupled to the magnet 108d. One end of the plate 109j is coupled to the frame 101, and the other end of the plate 109j is coupled to the magnet 108e.
[0096]
The magnet 108d and the yoke 111b face each other, and the magnet 108e and the yoke 111b face each other.
[0097]
The magnet 108d and the magnet 108e are fixed side by side in a state of being opposite to each other.
[0098]
The magnetic air gap 110 includes a magnetic air gap 110c and a magnetic air gap 110d.
[0099]
The magnetic gap 110c is defined by the plate 109i and the yoke 111b, and is a gap through which the magnetic flux generated from the magnet 108d passes. The magnetic gap 110d is defined by the plate 109j and the yoke 111b, and is a gap through which the magnetic flux generated from the magnet 108e passes.
[0100]
Between the magnet 108d and the magnet 108e, the spacer 112 of the aluminum plate which is a nonmagnetic material is arrange | positioned. Spacer 112 reduces magnetic flux shorts.
[0101]
The magnetic flux generated from the N pole of the magnet 108d enters the opposing yoke 111b via the magnetic gap 110c. It enters the south pole of the opposing magnet 108e through the magnetic gap 110d from the lower part of the yoke 111b. Furthermore, a closed loop of magnetic flux that reaches the S pole of the magnet 108d from the N pole of the magnet 108e through the plate 109j and the plate 109i is formed. For this reason, the magnetic flux direction is the direction from the magnet 108d to the yoke 111b in the magnetic gap 110c. The direction of the magnetic flux is the direction from the yoke 111b to the magnet 108e in the magnetic gap 110d.
[0102]
By disposing the magnet 108d and the magnet 108e in the vertical direction in the same manner as the vibration direction of the diaphragm, a portion with a high magnetic flux density is widened in the vertical direction of the magnetic gap 110. Therefore, the change in magnetic flux density when the voice coil 107 vibrates up and down is reduced. For this reason, a change in driving force is reduced. It is possible to realize a speaker that has a good linearity of the input-to-playback sound pressure characteristics, is excellent in low-frequency range playback, and has little sound distortion.
[0103]
In addition, the attachment position of a damper is not ask | required. For example, the mounting position of the damper may be higher than the mounting position of the magnetic circuit. The mounting position of the damper may be lower than the mounting position of the magnetic circuit. If the magnet 108d and the magnet 108e are arranged up and down in the same manner as the vibration direction of the diaphragm, a speaker with good linearity of input sound pressure characteristics, excellent low-frequency sound reproduction, and low sound distortion. Can be realized.
[0104]
【The invention's effect】
According to the speaker of the present invention, the magnetic circuit is disposed between the first plane parallel to the diaphragm and the second plane parallel to the diaphragm, and one end of the damper is connected to the first plane and the second plane. The other end of the damper is coupled to the frame at a position between the first plane and the second plane. Thereby, the mounting position of the damper does not exceed or fall below the mounting position of the magnetic circuit. As a result, it is possible to provide a speaker that is reduced in thickness by at least the thickness of the damper as compared to a conventional speaker in which a damper is provided above the magnetic circuit.
[Brief description of the drawings]
FIG. 1a is a diagram showing an upper surface of a speaker 100 according to an embodiment of the present invention.
FIG. 1B is a cross-sectional view taken along line A-A ′ of the speaker 100 according to the embodiment of the present invention.
FIG. 1c is a diagram showing a cross-section at B-B ′ of the speaker 100 according to the embodiment of the present invention;
FIG. 1d is a perspective view of a speaker 100 according to an embodiment of the present invention.
FIG. 2 is a perspective view of a driving force transmission member 104. FIG.
FIG. 3A is a diagram showing an upper surface of a speaker 100 using a diaphragm 103a having a recess.
FIG. 3B is a cross-sectional view taken along line A-A ′ of the speaker 100 using the diaphragm 103 a having a recess.
FIG. 3c is a cross-sectional view taken along the line B-B ′ of the speaker 100 using the diaphragm 103a having a recess.
FIG. 4A is a diagram showing a top surface of a speaker using a frame plate 101a having a recess and a frame plate 101b.
FIG. 4B is a cross-sectional view taken along the line A-A ′ of the speaker using the frame plate 101 a having a recess and the frame plate 101 b.
FIG. 4c is a perspective view of a speaker using the frame plate 101a having a recess and the frame plate 101b.
FIG. 5a is a diagram showing a top surface of a speaker using a magnetic circuit having protrusions.
FIG. 5b is a diagram showing a cross-section at A-A ′ of a speaker using a magnetic circuit having a protrusion.
FIG. 5c is a perspective view of a speaker using a magnetic circuit having protrusions.
FIG. 6a is a diagram showing the top surface of a speaker 100 having a bottom plate 101e.
FIG. 6B is a cross-sectional view taken along A-A ′ of the speaker 100 having the bottom plate 101 e.
6c is a perspective view of a speaker 100 having a bottom plate 101e. FIG.
FIG. 7 is a perspective view of a driving force transmission member 104a having a through hole.
FIG. 8 is a perspective view of a driving force transmission member 104a 'composed of a composite substrate.
FIG. 9A is a diagram showing a top surface of a speaker 100 using a magnetic circuit having one magnet.
FIG. 9B is a cross-sectional view taken along the line A-A ′ of the speaker 100 using a magnetic circuit having one magnet.
FIG. 9c is a cross-sectional view taken along the line B-B ′ of the speaker 100 using a magnetic circuit having one magnet.
9d is a perspective view of the speaker 100 using a magnetic circuit having one magnet. FIG.
FIG. 10a is a diagram showing a top surface of a speaker using a plate in which a part of the plate is in contact with an opposing yoke.
FIG. 10b is a diagram showing a cross-section at A-A ′ of a speaker using a plate in which a part of the plate is in contact with the opposing yoke.
FIG. 10c is a diagram showing a cross-section at B-B ′ of a speaker using a plate in which a part of the plate is in contact with an opposing yoke.
FIG. 11a is a diagram showing a top surface of a speaker using a magnetic circuit having a magnetic circuit section in which magnets are arranged one above the other.
FIG. 11B is a cross-sectional view taken along the line A-A ′ of a speaker using a magnetic circuit having a magnetic circuit unit in which magnets are arranged one above the other.
FIG. 11c is a diagram showing a cross-section at B-B ′ of a speaker using a magnetic circuit having a magnetic circuit section in which magnets are arranged one above the other.
FIG. 12a is a view showing the upper surface of a conventional speaker 1200;
FIG. 12B is a diagram showing a cross-section at A-A ′ of a conventional speaker 1200.
[Explanation of symbols]
100 speakers
101 frames
102 edge
103 diaphragm
104 Driving force transmission member
105 damper
106 Magnetic circuit
106a 106b Magnetic circuit section
107 voice coil
108 magnet
109 109a 109b 109c 109d Plate
110 110a 110b Magnetic gap

Claims (14)

Frame,
A magnetic circuit fixed to the frame;
A diaphragm fixed to the frame so as to vibrate in a predetermined direction;
A driving force transmission member coupled to the diaphragm;
A damper that supports the driving force transmission member,
The magnetic circuit is disposed between a first plane and a second plane, and the first plane is a plane parallel to the diaphragm, and at least a part of the magnetic circuit is in contact therewith. Is defined as a plane, and the second plane is a plane parallel to the diaphragm, and is defined as a plane in contact with at least a part of the magnetic circuit,
The driving force transmission member has a region where a voice coil is formed,
The driving force transmitting member is configured to transmit the driving force in the predetermined direction generated by the action of a current flowing through the voice coil and a magnetic flux provided by the magnetic circuit to the diaphragm.
One end of the damper is coupled to the driving force transmission member at a position between the first plane and the second plane, and the other end of the damper is coupled to the first plane and the second plane. A speaker coupled to the frame at a position between and a plane.   The speaker according to claim 1, wherein the magnetic circuit is disposed inside the frame.   The speaker according to claim 1, wherein the diaphragm has a recess, and the driving force transmission member is coupled to the recess of the diaphragm.   The speaker according to claim 1, wherein the frame has a recess, and at least a part of the magnetic circuit is embedded in the recess of the frame.   The speaker according to claim 4, wherein the magnetic circuit has a protrusion, and the frame has a portion coupled to the protrusion. The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and the first magnetic circuit unit,
The frame includes a first frame plate to which the first magnetic circuit unit is fixed, a second frame plate to which the second magnetic circuit unit is fixed, a third frame plate, and a fourth frame plate,
One end of the third frame plate is coupled to one end of the first frame plate, and the other end of the third frame plate is coupled to one end of the second frame plate,
The one end of the fourth frame plate is coupled to the other end of the first frame plate, and the other end of the fourth frame plate is coupled to the other end of the second frame plate. Speaker.   The speaker according to claim 6, wherein the frame further includes a bottom plate.   The speaker according to claim 1, wherein the driving force transmission member has at least one through hole in a region other than the region where the voice coil is formed.   The speaker according to claim 1, wherein the driving force transmission member is formed by bonding a core member having at least one through hole and a surface member having a region where the voice coil is formed. The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and a magnetic air gap defined by the first magnetic circuit unit and the second magnetic circuit unit,
The first magnetic circuit unit includes a rectangular parallelepiped first magnet, a first plate fixed to the upper surface of the first magnet, and a second plate fixed to the lower surface of the first magnet,
The second magnetic circuit unit includes a rectangular parallelepiped second magnet, a third plate fixed to the upper surface of the second magnet, and a fourth plate fixed to the lower surface of the second magnet,
One end of the first magnetic circuit unit is coupled to the frame, and one end of the second magnetic circuit unit is coupled to the frame, so that the first magnet and the second magnet are opposite to each other. And
The magnetic air gap is a first magnetic air gap defined by the first plate and the third plate, and the magnetic flux generated from the first magnet and the second magnet passes therethrough. A first magnetic gap, a second magnetic gap defined by the second plate and the fourth plate, through which the magnetic flux generated from the first magnet and the second magnet passes. The speaker according to claim 1, comprising a second magnetic gap. The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and a magnetic air gap defined by the first magnetic circuit unit and the second magnetic circuit unit,
The first magnetic circuit unit includes a cuboid magnet, a first plate fixed to the upper surface of the magnet, and a second plate fixed to the lower surface of the magnet,
The second magnetic circuit unit includes a yoke,
One end of the first magnetic circuit unit is coupled to the frame, one end of the second magnetic circuit unit is coupled to the frame, and the magnet and the yoke face each other,
The magnetic air gap is a first magnetic air gap defined by the first plate and the yoke, the first magnetic air gap through which the magnetic flux generated from the magnet passes, the second plate, The speaker according to claim 1, comprising a second magnetic air gap defined by the yoke and a second magnetic air gap through which the magnetic flux generated from the magnet passes.   The speaker according to claim 11, wherein at least a part of the first plate is in contact with the opposing yoke, and at least a part of the second plate is in contact with the opposing yoke. The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and a magnetic air gap defined by the first magnetic circuit unit and the second magnetic circuit unit,
The first magnetic circuit unit includes a rectangular parallelepiped first magnet, a rectangular parallelepiped second magnet, a first plate, and a second plate.
The second magnetic circuit unit includes a yoke,
One end of the first plate is coupled to the frame, the other end of the first plate is coupled to the first magnet, one end of the second plate is coupled to the frame, and the second plate The other end of the plate is coupled to the second magnet, the first magnet and the yoke face each other, the second magnet and the yoke face each other,
The first magnet and the second magnet are fixed side by side in the predetermined direction with opposite polarities,
The magnetic gap is a first magnetic gap defined by the first plate and the yoke, the first magnetic gap passing through the magnetic flux generated from the first magnet, and the second The speaker according to claim 1, further comprising: a second magnetic air gap defined by the plate and the yoke, the second magnetic air gap passing through the magnetic flux generated from the second magnet. Frame,
A magnetic circuit fixed to the frame;
A diaphragm fixed to the frame so as to vibrate in a predetermined direction;
A driving force transmission member coupled to the diaphragm;
A damper that supports the driving force transmission member,
The magnetic circuit is disposed between a first plane and a second plane, and the first plane is a plane parallel to the diaphragm, and at least a part of the magnetic circuit is in contact therewith. Is defined as a plane, and the second plane is a plane parallel to the diaphragm, and is defined as a plane in contact with at least a part of the magnetic circuit,
The driving force transmission member has a region where a voice coil is formed,
The driving force transmitting member is configured to transmit the driving force in the predetermined direction generated by the action of a current flowing through the voice coil and a magnetic flux provided by the magnetic circuit to the diaphragm.
The magnetic circuit includes a first magnetic circuit unit, a second magnetic circuit unit, and a magnetic air gap defined by the first magnetic circuit unit and the second magnetic circuit unit,
The first magnetic circuit unit includes a cuboid magnet, a first plate fixed to the upper surface of the magnet, and a second plate fixed to the lower surface of the magnet,
The second magnetic circuit unit includes a yoke,
One end of the first magnetic circuit unit is coupled to the frame, one end of the second magnetic circuit unit is coupled to the frame, and the magnet and the yoke face each other,
The magnetic air gap is a first magnetic air gap defined by the first plate and the yoke, the first magnetic air gap through which the magnetic flux generated from the magnet passes, the second plate, A second magnetic air gap defined by the yoke, through which the magnetic flux generated from the magnet passes ,
The speaker , wherein at least a part of the first plate is in contact with the opposing yoke, and at least a part of the second plate is in contact with the opposing yoke .

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