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DESCRIPTION JP3205396

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DESCRIPTION JP3205396
An object of the present invention is to improve the magnetic flux density to be crossed to a
voice coil by reducing the number of parts and reducing the magnetic resistance, and further to
make the mechanical dimension of the gap easier to achieve. Provide a driver unit, headphones, a
speaker unit and a microphone. A yoke is formed of iron in a cylindrical shape including a side
surface portion 52, a bottom surface portion 51 and a bottom surface portion 53. A cylindrical
cavity 71 is formed inside the yoke 34. The side surface portion 52, the bottom surface portion
51, and the bottom surface portion 53 are integrally formed without joints. The bottom surface
portion 51 is formed with a circular hole 61 concentric with the bottom surface and smaller than
the diameter of the bottom surface. The bottom surface portion 53 is formed with a circular hole
62 concentric with the bottom surface and smaller than the diameter of the hole 61. [Selected
figure] Figure 7
Yoke, internal magnet dynamic driver unit, headphones, speaker unit and microphone
[0001]
The present invention relates to a yoke, an internal magnetic dynamic driver unit, headphones, a
speaker unit and a microphone, and more particularly to a yoke for use in the internal dynamic
dynamic driver unit and an internal magnetic dynamic driver unit including the same, a
headphone and a speaker unit And the microphone.
[0002]
Headphones worn on the head or ear are widely used to listen to music and voice.
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[0003]
There are various types of driver units, such as a dynamic type and a capacitor type, which are
built in headphones and output sound.
Furthermore, there are an inner magnet type and an outer magnet type as the dynamic type.
[0004]
FIG. 1 is a cross-sectional view for explaining the configuration of a conventional internal magnet
dynamic type driver unit 101. As shown in FIG.
The diaphragm 121 is a diaphragm and is formed in a disk shape. The voice coil 122 is fixed to
the diaphragm 121. The magnet 123 is a permanent magnet. The yoke 124 and the pole 125 are
formed of an iron material having a relatively high permeability, and allow the magnetic flux
excited by the sandwiching magnet 123 to pass therethrough. The yoke 124 and the pole 125
concentrate the magnetic flux in a gap which is a gap between the yoke 124 and the pole 125,
and cross the magnetic flux with the voice coil 122 disposed in the gap. When the current of the
voice signal flows through the voice coil 122, the diaphragm 121 vibrates in the vertical
direction in FIG. 1 according to the voice signal according to Fleming's left-hand rule. ヨーク
124は、バックカバー131およびトッププレート132からなる。 The back cover 131 is
also referred to as a bottom plate or the like.
[0005]
Conventionally, a driver unit provided with a circular diaphragm and a drive unit for the
diaphragm, and a cover that accommodates the driver unit inside and divides the front chamber
and the rear chamber by the driver unit. A headphone has been proposed which forms a slit at a
position offset from the center of the front of the cover to the front of the ear. (See, for example,
Patent Document 1).
[0006]
JP, 2010-4372, A
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[0007]
According to Fleming's left-hand rule, when the magnetic flux density crossing the voice coil is
large, the driving force of the diaphragm becomes large even if the current flowing through the
voice coil is the same.
In order to increase the sensitivity of the driver unit, it is necessary to make the magnetic flux
density to cross the voice coil larger.
[0008]
However, the yoke 124 of the internal magnet dynamic type driver unit 101 is assembled from
two separate members, the back cover 131 and the top plate 132. For this reason, magnetic
resistance occurs at the joint between the back cover 131 and the top plate 132.
[0009]
In addition, when the yoke 124 is assembled from separate members of the back cover 131 and
the top plate 132, an error is likely to occur in the mechanical dimensions of the gap that is the
gap with the pole 125. As the mechanical dimensions change, the reluctance changes and the
magnetic flux density changes. That is, the sensitivity is likely to vary.
[0010]
The present invention has been made in view of such a situation, and by reducing the number of
parts and reducing the magnetic resistance, the magnetic flux density to be crossed to the voice
coil can be further increased, and further, the machine of the gap can be further improved. Make
it easier to take out the target dimensions.
[0011]
The yoke of the first aspect of the present invention is made of a magnet so as to be fixed to a
vibrating plate that vibrates to generate sound or vibrated by sound and to cross over the
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winding of a voice coil that vibrates with the vibrating plate. A yoke which guides the magnetic
flux, wherein a cylindrical cavity is formed inside, and is formed of iron in a cylindrical shape
consisting of a side portion and a portion of two bottom surfaces, a cylindrical side portion and
two bottom surfaces The first part is formed integrally without a joint, and one bottom part is
formed with a first hole which is a circular hole concentric with the bottom and smaller than the
diameter of the bottom, and the other bottom part Is formed with a second hole which is a
circular hole concentric with the bottom surface and smaller than the diameter of the first hole.
[0012]
In the yoke of the first aspect of the present invention, since the cylindrical side portion and the
two bottom portions are integrally formed without a joint, the yoke is assembled from two
separate members of the back cover and the top plate. In comparison to the case, the
magnetoresistance can be reduced.
Therefore, the magnetic flux density to cross the voice coil can be further increased.
In addition, the number of parts will be reduced. Furthermore, since the position of the first hole
in the yoke is fixed, only the attachment position of the pole need be managed, which makes it
easier to produce the mechanical dimension of the gap.
[0013]
The cylindrical side portion and the two bottom portions can be formed of the same material and
thickness. In this case, management of the magnetic flux density of the gap is facilitated.
[0014]
The inner-magnet dynamic type driver unit according to the second aspect of the present
invention comprises the yoke according to the first aspect of the present invention.
[0015]
The headphone according to the third aspect of the present invention comprises the yoke
according to the first aspect of the present invention.
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[0016]
The speaker unit of the fourth aspect of the present invention comprises the yoke of the first
aspect of the present invention.
[0017]
The microphone of the fifth aspect of the invention comprises the yoke of the first aspect of the
invention.
[0018]
As described above, according to the present invention, by reducing the number of parts and
reducing the magnetic resistance, the magnetic flux density to be crossed to the voice coil is
further increased, and the mechanical dimension of the gap is more easily obtained. .
[0019]
It is sectional drawing explaining the structure of the conventional driver unit.
It is an exploded view explaining an example of composition of a headphone concerning the
present invention.
It is a sectional view explaining an example of composition of a driver unit concerning the
present invention.
It is a top view explaining the structure of the yoke concerning the present invention.
It is a side view explaining the structure of the yoke concerning the present invention.
It is a bottom view explaining the structure of the yoke concerning the present invention. It is a
sectional view explaining the structure of the yoke concerning the present invention.
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[0020]
An embodiment of the present invention will be described below. The correspondence between
the constituent requirements of the present invention and the embodiment described in the
detailed description of the invention is as follows. This description is to confirm that the
embodiment supporting the present invention is described in the detailed description of the
invention. Therefore, although described in the detailed description of the invention, even if there
is an embodiment corresponding to the constituent requirements of the present invention, even if
there is an embodiment which is not described here, It does not mean that the embodiment does
not correspond to the constituent requirements. Conversely, even if the embodiments are
described herein as corresponding to configuration requirements, that means that the
embodiments do not correspond to configuration requirements other than the configuration
requirements. It is not something to do.
[0021]
The yoke of the first aspect of the present invention is made of a magnet so as to be fixed to a
vibrating plate that vibrates to generate sound or vibrated by sound and to cross over the
winding of a voice coil that vibrates with the vibrating plate. A yoke (for example, the yoke 34 of
FIG. 3) for guiding the magnetic flux of the first and second portions (for example, the side
portion 52 of FIG. 7) and two bottom portions (for example, side portions 52 of FIG. For example,
it is formed of iron in a cylindrical shape consisting of the bottom 51 and the bottom 53 in FIG.
7, and the cylindrical side portion and the two bottom portions are integrally formed without a
joint, and one bottom portion (for example, 7 is formed with a first hole (for example, the hole 61
in FIG. 7) which is a circular hole concentric with the bottom surface and smaller than the
diameter of the bottom surface, and the other bottom surface (For example, the bottom 53 of FIG.
7) A bottom surface concentric, the first hole second hole is a smaller diameter circular hole than
the diameter (e.g., hole 62 in FIG. 7) is formed.
[0022]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2
to 7.
FIG. 2 is an exploded view for explaining an example of the configuration of a headphone
according to the present invention.
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[0023]
FIG. 2 shows the configuration of one side of a headphone, that is, the so-called one channel. The
headphones 1 are worn on the head and ears of the user to listen to music and voice, and emit
the sounds to the user's ears in response to electrical signals of the audio supplied from an
amplifier, a music player, and the like. The headphone 1 includes a driver unit 11, a frame 12, a
housing 13, an ear pad 14, an arm 15, a head band 16, and a head pad 17. The driver unit 11 is
an example of an internal-magnet dynamic type driver unit, and outputs an audio according to an
electrical signal when an electrical signal of the audio is input from the outside. The
configuration of the driver unit 11 will be described later.
[0024]
The frame 12 is a framework that supports the driver unit 11, the housing 13 and the ear pad
14. The frame 12 is formed in a ring shape of magnesium alloy, aluminum alloy, iron material,
resin or the like. The frame 12 is supported by an arm 15. The housing 13 covers the back side
of the driver unit 11 and isolates the sound emitted from the back of the driver unit 11. The
housing 13 is formed in a bowl shape of resin, magnesium alloy, aluminum alloy, wood or the
like. Further, on the inner surface side of the housing 13, a cavity having a predetermined
volume is formed so as to secure a space volume necessary for driving the driver unit 11.
[0025]
The ear pad 14 is formed in a circular or elliptical ring shape from a foamed polyurethane resin
(sponge) and a synthetic leather or the like. The ear pad 14 covers the user's auricle (auricle)
when the headphones 1 are worn. The ear pad 14 prevents the sound output from the driver unit
11 from leaking to the outside and shields external noise.
[0026]
The arm 15 is formed in a Y-shape of magnesium alloy, aluminum alloy, iron material, resin or
the like. One end of the arm 15 and the end of the bifurcated side (the side open in a Y-shape)
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supports the frame 12 so as to be pivotable within a predetermined angular range. The other end
of the arm 15 is supported by the headband 16. The headband 16 is formed in a semicircular
shape from an elastic resin, an aluminum alloy, an iron material, or the like. When the
headphones 1 are worn, the headband 16 holds the headphones 1 on the user's head across the
top of the head of the user. The head pad 17 is formed to cover the head band 16 from a foamed
polyurethane resin (sponge) and synthetic leather. The head pad 17 softens the contact with the
top of the head of the user when the headphones 1 are worn.
[0027]
FIG. 3 is a cross-sectional view for explaining an example of the configuration of the driver unit
11. The driver unit 11 includes a diaphragm 31, a flange 32, a magnet 33, a yoke 34, a pole 35, a
coil 37, and a damper 38.
[0028]
The diaphragm 31 is an example of a diaphragm and is formed in a disk shape as a whole. More
specifically, the central side of the diaphragm 31 is formed in a dome shape in which a circular
central portion is raised, and the outer peripheral side is a ring shape and is formed in a donutshaped torus toroidal shape. The diaphragm 31 is formed of a thin plate of resin, a thin plate of
metal such as aluminum alloy, titanium alloy or magnesium alloy, or woven fabric such as
polyester, silk or Kevlar (registered trademark). The outer peripheral side of the diaphragm 31 is
fixed to the outer peripheral side of the flange 32 via an edge which is a flexible film.
[0029]
The flange 32 is formed of a material such as resin, stainless steel, aluminum alloy, titanium alloy
or magnesium alloy, which has a relatively low permeability, and can obtain strength and rigidity.
The flange 32 is formed in a disk shape as a whole. The central portion of the flange 32
protrudes cylindrically.
[0030]
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A magnet 33, a yoke 34 and a pole 35 are accommodated in a central portion of the flange 32 in
which a cylindrically projecting cavity is formed. The magnet 33 is a so-called permanent magnet
and generates a magnetic field. The magnet 33 is formed in a ring shape. For example, the
magnet 33 is formed of a neodymium magnet. The circular ends of the magnet 33 are
respectively N pole or S pole. The magnet 33 is stored inside the cylindrical yoke 34. ヨーク
34は、いわゆるアウターポールである。 The details of the shape of the yoke 34 will be
described later. The pole 35 is a so-called center pole (pole piece), is formed in a disk shape, and
is disposed in the circular opening of the yoke 34 in contact with the circular end of the magnet
33.
[0031]
One end of the circular end of the magnet 33 is in contact with the inside of the cylindrical yoke
34, and the other end is in contact with the disc-shaped pole 35. In other words, the north pole
and the south pole of the magnet 33 are sandwiched by the yoke 34 and the pole 35.
[0032]
The diameter of the circular opening of the yoke 34 is larger than the diameter of the disc-like
pole 35, and a gap (air gap) 36 is formed between the edge of the opening of the yoke 34 and
the outer edge of the pole 35. Is formed. The coil 37 is disposed in the gap 36 so as not to
contact the edge of the opening of the yoke 34 or the edge of the outer periphery of the pole 35.
The coil 37 is a so-called voice coil, and its winding is helically wound in a cylindrical shape, and
generates a magnetic field when current flows. The coil 37 is fixed to the diaphragm 31 by an
adhesive or the like. The windings of the coil 37 are wound along the edge of the circular
opening of the yoke 34 and the edge of the outer periphery of the pole 35.
[0033]
The yoke 34 and the pole 35 are formed of an iron material having a relatively high permeability.
Accordingly, the magnetic flux excited by the magnet 33 is concentrated in the gap 36, and the
magnetic flux intersects the winding of the coil 37.
[0034]
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The damper 38 is formed in a film shape of paper, resin, or the like, and is disposed between the
diaphragm 31 and the flange 32. The damper 38 restricts the movement of the diaphragm 31 so
as not to move in the direction along the surface of the diaphragm 31 without obstructing the
movement in the direction orthogonal to the surface of the diaphragm 31. Further, the damper
38 suppresses the natural vibration of the diaphragm 31.
[0035]
At the center of the flange 32, the magnet 33, the yoke 34 and the pole 35, holes of the same
diameter are formed. When the flange 32, the magnet 33, the yoke 34 and the pole 35 are
overlapped, this hole becomes an air hole 39 and is moved on the pole 35 side of the surface of
the diaphragm 31 so as not to disturb the vibration of the diaphragm 31. Escape the
[0036]
Next, the structure of the yoke 34 will be described with reference to FIGS. 4 to 7. 4 to 7 are a
plan view, a side view, a bottom view, and a cross-sectional view for explaining the structure of
the yoke 34, respectively. FIG. 7 is a cross-sectional view seen from the line AA ′ in FIG. The CC
′ line in FIGS. 5 and 7 is a center line indicating the center.
[0037]
In FIGS. 4 to 7, the direction in which the diaphragm 31 vibrates is the vertical direction, and the
vertical direction with respect to the yoke 34 is illustrated by the Z axis, and the front and rear
directions are illustrated by the Y axis. Illustrated by an axis. Further, hereinafter, in the X-axis
direction, the left side in FIG. 4 is simply referred to as the left side, and in the X-axis direction,
the right side in FIG. 4 is simply referred to as the right side. Further, hereinafter, in the Y-axis
direction, the lower side in FIG. 4 is simply referred to as the front side, and in the Y-axis
direction, the upper side in FIG. 4 is simply referred to as the rear side. Furthermore, hereinafter,
in the Z-axis direction, the near side in FIG. 4 is simply referred to as the upper side, and in the Zaxis direction, the far side in FIG. 4 is simply referred to as the lower side. The Z-axis direction is
also simply referred to as the vertical direction, and the direction along the plane parallel to the
X-axis and the Y-axis is also simply referred to as the horizontal direction or the horizontal
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direction.
[0038]
The yoke 34 is formed of an iron material having a relatively high permeability, such as SUYPO
(pure iron), SPCC or SPCD (cold-rolled soft iron), SPHC or SPHD (hot-rolled soft iron), or
electromagnetic soft iron. The yoke 34 is formed in a cylindrical shape whose bottom surface is
circular. That is, the yoke 34 is formed in a cylindrical shape. The center of the circular base is
indicated by the CC 'line in FIGS.
[0039]
The yoke 34 is composed of a bottom portion 51 corresponding to the upper bottom portion of
the cylinder, a side portion 52 corresponding to the side portion of the cylinder, and a bottom
portion 53 corresponding to the lower bottom portion of the cylinder. That is, the yoke 34 is
formed in a cylindrical shape including the bottom surface 51, the side surface 52 and the
bottom surface 53.
[0040]
The bottom surface portion 51, the side surface portion 52, and the bottom surface portion 53
are integrally formed without joints. That is, the bottom surface 51, the side surface 52, and the
bottom surface 53 are not composed of separate parts, and are not joined by adhesion, welding,
pressure welding, welding or the like. By doing this, the permeability of each part of the yoke 34
does not change. The bottom surface portion 51, the side surface portion 52, and the bottom
surface portion 53 are formed of the same material and in the same thickness.
[0041]
A cylindrical cavity 71 is formed inside the yoke 34.
[0042]
Further, it can be said that the outer shape of the yoke 34 is formed in a cylindrical shape, and a
cylindrical cavity 71 similar to the outer shape is formed inside the yoke 34.
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[0043]
Thus, it can also be said that the yoke 34 is formed in a hollow cylindrical shape.
That is, it can also be said that the yoke 34 is a cylinder in which the cavity 71 which is a
cylindrical hollow part is formed in the inside.
[0044]
In the bottom surface portion 51, a circular hole 61 is formed.
The center of the hole 61 coincides with the center of the circular bottom of the yoke 34. When
the yoke 34 is assembled to the driver unit 11, the edge of the hole 61 forms a gap 36 with the
outer edge of the pole 35.
[0045]
In the bottom portion 53, a circular hole 62 is formed. The center of the hole 62 coincides with
the center of the circular bottom of the yoke 34. When the yoke 34 is assembled to the driver
unit 11, the hole 62 forms an air hole 39.
[0046]
The diameter of the hole 61 is larger than the outer diameter of the ring-shaped magnet 33, and
the diameter of the hole 62 is the same as the diameter of the inner hole of the magnet 33, so the
diameter of the hole 62 is smaller than the diameter of the hole 61 .
[0047]
That is, the bottom surface portion 51 is formed with a circular hole 61 concentric with the
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bottom surface of the cylinder and smaller in diameter than the diameter of the bottom surface
of the cylinder.
The bottom surface portion 53 is formed with a circular hole 62 concentric with the bottom
surface of the cylinder and smaller in diameter than the diameter of the hole 61.
[0048]
The yoke 34 is processed and formed by cutting, pressing, drawing and the like.
[0049]
For example, first, the yoke 34 is cut into a cylindrical shape by cutting.
Then, the hole 62 is cut and opened, the hole 61 is cut from the bottom surface 51 side, a mill is
inserted from the hole 61 and the hole 62, and the inside of the yoke 34 is cut to form a cavity
71.
[0050]
Also, for example, first, the yoke 34 is formed in a cylindrical shape in which the two bottom
surfaces are opened by pressing. Furthermore, by pressing, one end of the cylindrically formed
yoke 34 is extended by an equal length from the side toward the center of the circular bottom so
as to be orthogonal to the side. Thus, the holes 61 are formed in the bottom surface portion 51.
Further, the other end of the end of the cylindrical yoke 34 is also extended by an equal length
from the side toward the center of the circular bottom so as to be orthogonal to the side by
pressing. Thus, the hole 62 is formed in the bottom surface portion 53. In this case, the holes 61
and the holes 62 can be formed simultaneously in a series of steps.
[0051]
Furthermore, for example, the end of a cylindrical yoke 34 having two open bottoms is drawn by
drawing to extend to the center of the circular bottom so as to be perpendicular to the side, from
the side by an equal length. Alternatively, the hole 61 may be formed in the bottom surface
portion 51 and the hole 62 may be formed in the bottom surface portion 53.
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[0052]
Furthermore, the yoke 34 may be formed by pressing or drawing into a tire shape (in particular,
a shape similar to that of an automobile tire) or a drum shape, and then cutting the holes 61 and
62. it can.
[0053]
The driver unit 11 including the yoke 34 can also be used as a speaker unit such as a tweeter or
a squawker.
[0054]
In addition, the yoke 34 can also be adopted as a dynamic type microphone having the same
structure as that of the driver unit 11.
When the diaphragm 31 of the driver unit 11 vibrates by voice, an electromotive force is
generated in the coil 37, and this can be extracted as a voice signal.
That is, when the yoke 34 is adopted in a dynamic type microphone having the same structure as
that of the driver unit 11, the yoke 34 is fixed to the vibrating plate vibrated by sound and
intersects the winding of the voice coil vibrating together with the vibrating plate Lead the
magnetic flux from the magnet.
[0055]
Thus, the yoke 34 is fixed to the diaphragm 31 vibrated to generate sound or vibrated by the
sound, and the magnetic flux from the magnet 33 is crossed so as to cross the winding of the coil
37 which vibrates with the diaphragm 31. Lead.
The yoke 34 is formed of iron in a cylindrical shape including the side surface 52, the bottom
surface 51 and the bottom surface 53. A cylindrical cavity 71 is formed inside the yoke 34. The
side surface portion 52, the bottom surface portion 51, and the bottom surface portion 53 are
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integrally formed without joints. The bottom surface portion 51 is formed with a circular hole 61
concentric with the bottom surface and smaller than the diameter of the bottom surface. The
bottom surface portion 53 is formed with a circular hole 62 concentric with the bottom surface
and smaller than the diameter of the hole 61.
[0056]
Since the side surface 52, the bottom surface 51 and the bottom surface 53 are integrally formed
without a joint, the magnetic resistance can be reduced as compared to the case where the yoke
is assembled from two separate members of the back cover and the top plate. it can. Therefore,
the magnetic flux density to be crossed to the coil 37 which is a voice coil can be further
increased. In addition, the number of parts will be reduced. Therefore, the assembly of the driver
unit 11 is easier. Furthermore, since the position of the hole 61 in the yoke 34 is fixed, only the
attachment position of the pole 35 needs to be managed, and the mechanical dimensions of the
gap 36, which is an example of the gap, can be more easily obtained.
[0057]
The side surface portion 52, the bottom surface portion 51, and the bottom surface portion 53
are formed of the same material and in the same thickness. In this case, management of the
magnetic flux density of the gap 36 is facilitated.
[0058]
The driver unit 11 comprises a yoke 34.
[0059]
The headphone 1 comprises a yoke 34.
[0060]
Further, the embodiments of the present invention are not limited to the above-described
embodiments, and various modifications can be made without departing from the scope of the
present invention.
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[0061]
DESCRIPTION OF SYMBOLS 1 headphone, 11 driver units, 12 frames, 13 housings, 14 ear pads,
15 arms, 16 headbands, 17 head pads, 31 diaphragms, 32 flanges, 33 magnets, 34 yokes, 35
poles, 36 gaps, 37 coils, 38 Damper, 39 air holes, 51 bottom, 52 sides, 53 bottom, 61 holes, 62
holes, 71 cavities
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