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JP2009049757

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DESCRIPTION JP2009049757
The present invention provides an ear-insertion type earphone which can suppress easy
detachment from the ear while improving the volume and the sound quality. SOLUTION: An earinsertion type earphone 1 is provided with a speaker unit 3 having a housing 4, a housing 4 and
a vibration unit 10 and a magnetic circuit unit 9 for vibrating the vibration unit 10. . The
vibrating portion 10 is provided with a vibrating plate 22 and a voice coil 20 fixed to the
vibrating plate 22 and supplied with a sound current to vibrate the vibrating plate 22 in
cooperation with the magnetic circuit unit 9. The voice coil 20 is formed in a long flat plate
shape, and the longitudinal direction thereof is disposed in parallel with the radiation direction H
of the sound generated when the diaphragm 22 vibrates. [Selected figure] Figure 1
Ear insertion type earphone
[0001]
The present invention relates to, for example, an ear-insertion type earphone which is inserted
into an ear canal of a human ear.
[0002]
Conventionally, various earphones (see, for example, Patent Document 1) have been used as earinsertion-type earphones attached to human ears.
The earphone disclosed in Patent Document 1 of this kind includes a speaker unit for generating
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sound, an earphone main body as a transmitter main body, etc., which accommodates the
speaker unit and is attached to the auricle (also referred to as auricle). ing.
[0003]
The speaker unit includes a vibrating portion having a diaphragm or the like that vibrates to
generate a sound when an audio current is applied, and a magnetic circuit portion for vibrating
the vibrating portion of the vibrating portion, and It is formed in the shape of a circle.
[0004]
The earphone main body is provided with a tubular portion which can be attached to the pinna
and which accommodates the speaker unit.
The tubular portion accommodates the speaker main body in such a manner that a diaphragm or
the like of the speaker unit is exposed.
[0005]
In the earphone of the configuration described above, the tubular portion of the earphone body
is attached to the auricle of a person or the like, a voice current is applied to the voice coil of the
speaker unit, and the diaphragm of the vibrating portion vibrates to generate sound. It is
generated and this sound (also referred to as sound information) is transmitted to the
aforementioned person or the like.
[0006]
In addition, since the earphone shown in Patent Document 1 of this kind is formed in the shape
of a disc with a speaker unit, it is difficult to insert the speaker unit into the ear canal, and it is
easily detached from the ear I will.
In addition, it is necessary to open the front side of the speaker unit (above the diaphragm), and
the earphone is provided with a structure having a poor sealing property. Therefore, for example,
it is difficult to expand the bass reproduction band.
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[0007]
In order to solve this type of problem, that is, in order to miniaturize and insert it into the ear
canal, an earphone (see, for example, Patent Document 2) provided with a so-called balanced
armature type speaker unit has been proposed. JP-A-11-225387 JP-A-2007-74499
[0008]
It is difficult to miniaturize the speaker unit until it becomes possible to insert the earphone
shown in Patent Document 1 described above into the ear canal, and it easily falls off the ear.
[0009]
Further, although the earphone shown in Patent Document 2 can be miniaturized until it can be
inserted into the ear canal, the balanced armature type speaker unit vibrates the diaphragm
through the lever. , The improvement of the efficiency and the expansion of the bass
reproduction band have characteristics opposite to each other.
Therefore, in the earphone disclosed in Patent Document 2, it is difficult to improve the volume
and the sound quality.
[0010]
The present invention takes as an example the problem to address such problems. An object of
the present invention is, for example, to provide an ear-insertion type earphone which can
suppress easy detachment from the ear while improving the volume and the sound quality.
[0011]
In order to solve the above problems and achieve the object, the ear-insertion type earphone
according to the present invention as set forth in claim 1 is a speaker unit having a case, a
vibrating portion attached to the case, and a magnetic circuit portion. And the vibration unit
includes a diaphragm and a voice coil, and the voice coil is formed in a long flat plate shape, and
the sound generated when the diaphragm vibrates in the longitudinal direction thereof. It is
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characterized in that it is disposed substantially in parallel with the radial direction.
[0012]
Hereinafter, an embodiment of the present invention will be described.
In the ear-insertion type earphone according to one embodiment of the present invention, by
fixing the voice coil directly to the diaphragm, the speaker unit is made as a so-called dynamic
type to improve the volume and sound quality, and further, this voice coil is By forming a long
flat plate and arranging the longitudinal direction in parallel with the radiation direction of the
sound generated when the diaphragm vibrates, it is possible to miniaturize the speaker unit to a
size that can be inserted into the ear canal There is.
[0013]
Further, in the ear-insertion type earphone according to the present embodiment, the voice coil
housing portion is provided at the central portion of the diaphragm main body formed in a thin
plate shape and a long flat plate shape of the vibrating portion. Can be fixed, and the volume and
sound quality can be improved.
[0014]
Furthermore, an opening for sound emission may be provided on the front end surface of the
housing.
In this case, the sound generated by the speaker unit can be easily guided into the ear canal.
[0015]
In addition, since the earphone main body that houses the housing and the speaker unit is
provided, it is possible to prevent the speaker unit and the like from being damaged, and foreign
matter from adhering and becoming dirty.
[0016]
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Furthermore, since the earphone body is formed in a tubular shape, the speaker unit and the like
can be accommodated without preventing the sound generated by the speaker unit from being
guided into the ear canal.
[0017]
The magnetic circuit unit may further include a gap holding unit that holds the gap between the
magnets of which the different poles of the magnetic circuit unit are arranged to face each other.
In this case, since the distance between the magnets is kept constant along the longitudinal
direction of the voice coil and the vibrating portion or earphone, the magnetic gap formed by
these magnets is in the longitudinal direction of the voice coil and vibrating portion or earphone.
Unevenness (variation) can be suppressed.
[0018]
The spacer may be made of a nonmagnetic material.
In this case, the spacing portion can be excited to prevent the magnetic gap formed by the
magnet from becoming uneven (varied) in the longitudinal direction of the voice coil and the
vibrating portion, that is, the earphone.
[0019]
The magnetic circuit unit may include a plate and a frame. In this case, since the magnet and the
plate are attached to the frame, it is possible to prevent the magnetic gap formed by the magnet
from becoming uneven (varied) in the longitudinal direction of the voice coil and the vibrating
portion, that is, the earphone.
[0020]
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The magnetic circuit unit may be filled with the magnetic fluid between the pair of plates. In this
case, it is possible to prevent the vibration of the diaphragm from becoming uneven in the
longitudinal direction of the diaphragm, that is, it is possible to prevent the diaphragm from
rolling, the diaphragm or the voice coil from contacting the plate, etc. It is possible to suppress
the generation of abnormal noise. Further, it is not necessary to provide a damper, and the
earphone can be miniaturized.
[0021]
A space may be provided on the frame. In this case, the increase in the number of parts can be
suppressed, and the cost increase can be suppressed.
[0022]
Since the lead wire connected to the voice coil is led to the outside from the central portion in the
longitudinal direction of the diaphragm along the width direction of the diaphragm, vibration
(reverse resonance, etc.) of the diaphragm causes the lead wire to The application of tension
(force to pull the lead wire) can be suppressed, and breakage of the lead wire can be suppressed.
[0023]
One embodiment of the present invention will be described with reference to FIGS.
The ear-insertion type earphone 1 (hereinafter simply referred to as an earphone) shown in FIG.
1 is inserted into an ear canal O (shown in FIG. 1) of an ear of a person or the like to produce a
sound. Transfer to the person mentioned above.
[0024]
As shown in FIG. 1, the earphone 1 includes an earphone body 2, a speaker unit 3 that generates
sound, and a housing 4.
[0025]
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As shown in FIG. 1, the earphone body 2 includes an accommodating portion 5 and a spherical
portion 6.
The housing portion 5 and the spherical portion 6 are both made of resin or the like. The
housing portion 5 integrally includes a bottom portion 7 and a cylindrical portion 8 erected from
the outer edge of the bottom portion 7, and is formed in a tubular shape of a size that can be
inserted into the external ear canal O of a person's ear.
[0026]
The spherical portion 6 is formed in a cylindrical shape having a substantially spherical outer
shape, and has a size that can be inserted into the ear canal O of an ear of a person or the like, or
formed as a stopper when inserting the earphone 1 into the ear canal O It is done. The spherical
portion 6 is attached to the outer periphery of one end of the housing 5 on the side away from
the bottom 7. Further, the spherical portion 6 is formed in a cylindrical shape with both ends
opened, and the opening 29 is exposed without covering the opening 29 described later provided
in the housing 4.
[0027]
The earphone main body 2 includes a cylindrical housing portion 5 and a cylindrical spherical
portion 6 attached to the outer periphery of the housing portion 5, and is formed in a cylindrical
shape as a whole. The earphone main body 2 houses the housing 4 and the speaker unit 3 inside
the housing portion 5 and the spherical portion 6.
[0028]
As shown in FIGS. 2 to 5, the speaker unit 3 includes a magnetic circuit unit 9 and a vibrating
unit 10.
[0029]
The magnetic circuit unit 9 includes a frame 11 made of a nonmagnetic material, a yoke 12 made
of a magnetic body (so-called paramagnetic body or ferromagnetic body) or the like, a pair of
magnets 13 and a magnetic body (so-called, And a pair of plates 14 made of paramagnetic
material or ferromagnetic material or the like.
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[0030]
As shown in FIG. 3, the frame 11 is formed in a frame shape by integrally including a pair of
straight portions 15, a pair of connecting portions 16, and a gap holding portion 17.
That is, the frame 11 is provided with the spacing maintaining portion 17 made of a
nonmagnetic material.
The straight portions 15 are each formed in a linearly extending band plate shape. The pair of
straight portions 15 are arranged parallel to each other at an interval. The linear portion 15 is
formed in a rectangular shape in its cross-sectional shape, and is arranged such that the
longitudinal directions of the cross-sections thereof are substantially aligned with one another.
[0031]
The connecting portion 16 connects the ends of the pair of linear portions 15 to each other. The
spacing maintaining portion 17 linearly extends from the end face of the pair of connecting
portions 16 along the longitudinal direction of the linear portion 15. The spacing holding portion
17 is disposed between the pair of straight portions 15. The space ¦ interval holding ¦
maintenance part 17 is arrange ¦ positioned between a pair of magnets 13, controls that these
magnets 13 approach mutually, and mutually contacts, and maintains the space ¦ interval
between these pair of magnets 13. As shown in FIG.
[0032]
Further, as shown in FIG. 5, in the frame 11, one surface of the straight portion 15 and the
connecting portion 16 is continuously formed flat. Furthermore, the frame portion 18 erected
from the outer edge of the above-described one surface is formed on the frame 11 so as to
extend over the straight portion 15 and the connecting portion 16, that is, over the entire
circumference.
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[0033]
Moreover, below the linear part 15, the notch 31 is formed. The formation of the notch 31
prevents the frame 11 from being deformed by the magnetic force between the pair of magnets
13 and becoming nonuniform (varied) in the interval between the linear portions 15, particularly
in the longitudinal direction. ing.
[0034]
The yoke 12 is formed in a band plate shape, and the rear surface side (below the diaphragm 22)
of the speaker unit 3 is sealed. The yoke 12 has a planar shape substantially equal to that of the
outer edge of the frame 11 and is formed slightly smaller than the frame 11.
[0035]
The magnets 13 are each formed in the shape of a linearly extending strip, and are formed in
substantially the same shape and size as the linear portion of the frame 11. The magnets 13 are
arranged in parallel, spaced apart from one another, and superimposed on the yoke 12. The
magnet 13 is magnetized such that one surface side thereof is one of the N pole and the S pole,
and the other surface side is magnetized so as to be the other magnetic pole. For example, in FIG.
2, the magnet 13 on the left side is magnetized so that the front side is the N pole and the back
side is the S pole, and the front side of the magnet 13 on the right is S pole, and the back side is
the N pole. It is done.
[0036]
The plates 14 are each formed in the shape of a linearly extending strip, and are formed in
substantially the same shape and size as the linear portion 15 of the frame 11 and the magnet
13. The plates 14 are spaced apart and parallel to one another and are each superimposed on the
magnet 13.
[0037]
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In the magnetic circuit unit 9, a pair of magnets 13 and a pair of plates 14 are sequentially
stacked on a yoke 12, a pair of plates 14 overlaps a straight portion 15 of the frame 11, and a
pair of plates 14 and a pair of magnets 13 The space ¦ interval holding ¦ maintenance part 17 is
positioned and it assembles. Thus, the pair of magnets 13 and the pair of plates 14 are attached
to the frame 11. At this time, the longitudinal directions of the yoke 12, the pair of magnets 13,
and the pair of plates 14 are disposed substantially parallel to each other, and the pair of
magnets 13 are disposed in a state in which different poles face each other at an interval. ing.
[0038]
With the configuration described above, the magnetic circuit unit 9 forms a magnetic gap G
between the pair of plates 14.
[0039]
The vibration part 10 is provided with the diaphragm 22, the voice coil 20, and a pair of lead
wire 21 (it shows in FIG. 6), as shown to FIG. 2 and FIG.
[0040]
The diaphragm 22 is made of resin and formed in a thin plate shape.
The diaphragm 22 is integrally provided with a diaphragm main body 23 formed in a flat plate
shape having a longitudinal shape in a plan view, that is, a long flat plate shape, and a voice coil
storage portion 24 provided at a central portion of the diaphragm main body 23.
The diaphragm main body 23 is formed so that the planar shape thereof is substantially the same
as the shape of the portion surrounded by the inner surface of the frame portion 18 of the frame
11. The diaphragm main body 23 is formed in a substantially arc shape in cross section with the
central portion as a boundary. Further, a groove 32 is formed at an end of the diaphragm body
23. The groove 32 suppresses the occurrence of split vibration, split resonance and the like in
the diaphragm main body 23. The diaphragm main body 23 is superimposed on the abovedescribed one surface of the frame 11, and the outer edge thereof is fixed to the above-described
one surface of the frame 11 by an adhesive or the like. As described above, since the outer edge
of the diaphragm main body 23 is fixed to the frame 11 with the adhesive, the diaphragm 22
separates the space on the front side of the diaphragm 22 and the space on the back side.
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[0041]
The voice coil housing portion 24 is provided at the central portion of the diaphragm main body
23 and extends linearly along the longitudinal direction of the diaphragm main body 23. The
voice coil accommodating portion 24 has a cross-sectional shape formed into a groove shape,
having an outer peripheral portion and a bottom portion extending from the central portion of
the diaphragm main body 23 to the pair of plates 14 or the sound radiation direction. There is.
[0042]
The voice coil 20 is formed in a long flat plate shape as a whole, and, as shown in FIGS. 1 and 2, a
pair of substantially parallel straight portions 25 and an arc shape connecting both ends of the
straight portions 25. And the connecting portion 26 of the second embodiment is formed in a
rectangular shape. The length in the longitudinal direction of the voice coil 20 is formed to be
substantially equal to the length of the voice coil accommodating portion 24. The voice coil 20 is
configured to be wound along its planar shape, and an audio current supplied via a lead wire 21
described later flows along the planar shape.
[0043]
The voice coil 20 is housed in the voice coil housing 24 and fixed to the voice coil housing 24,
that is, the diaphragm 22 by an adhesive or the like. At this time, the pair of straight portions 25
is disposed substantially in parallel with the frame 11, the magnet 13, and the plate 14, and one
of the straight portions 25 is disposed in the magnetic gap G described above. Furthermore, the
voice coil 20 is disposed such that the longitudinal direction of the cross section of the linear
portion 25 is parallel to the vibration direction of the diaphragm 22 of the vibrating portion 10.
[0044]
The lead wire 21 is electrically connected to both ends of the voice coil 20 to supply an audio
current to the voice coil 20. As shown in FIG. 6, the lead wire 21 extends from the central portion
in the longitudinal direction of the diaphragm 22 in the width direction of the diaphragm 22
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(direction perpendicular to the vibration direction S of the diaphragm 22). It extends from
Further, the direction in which the lead wire 21 is drawn from the voice coil 20 is either the
longitudinal direction of the diaphragm 22, the width direction of the diaphragm 22, the
vibration direction of the diaphragm 22, or the direction substantially orthogonal to the vibration
direction of the diaphragm 22. I don't care. In particular, in order to prevent excessive tension or
the like from acting on the lead wire 21, a direction substantially perpendicular to the width
direction of the diaphragm 22, the vibration direction of the diaphragm 22, or the vibration
direction of the diaphragm 22 is preferable. Although the position at which the lead wire 21 is
drawn from the voice coil 20 is not particularly limited, the lead wire 21 is closer to the position
where the lead wire 21 is drawn from the central portion in the longitudinal direction of the
diaphragm 22. It is preferable at the point which can suppress that abnormal noise generate ¦
occur ¦ produces by contacting etc. and contacting. Furthermore, although not shown, a drawing
passage communicating with the outside is formed in the plate 14, the magnet 13, and the frame
11, and the lead wire 21 may pass through the drawing passage, and contact between the
diaphragm 22 and the lead wire 21 occurs. It is possible to suppress the deterioration of the
acoustic characteristics due to contact and the like.
[0045]
In the speaker unit 3 described above, when an audio current is supplied to the voice coil 20
through the lead wire 21, the voice coil 20 and the magnetic circuit unit 9 cooperate with each
other to form the diaphragm main body 23 of the diaphragm 22. The diaphragm main body 23
of the diaphragm 22, that is, the vibration unit 10 of the diaphragm 22 is converted into a sound
current by vibrating along the direction S orthogonal to both the longitudinal direction of the
diaphragm main body 23 and the direction in which the pair of plates 14 oppose each other.
Generate a corresponding sound. That is, the magnetic circuit unit 9 vibrates the vibrating unit
10 to generate a sound. Thus, the speaker unit 3 is disposed in a state in which the longitudinal
direction of the voice coil 20 is orthogonal to the vibration direction of the diaphragm 22. The
direction S orthogonal to both the longitudinal direction of the diaphragm main body 23 and the
direction in which the pair of plates 14 oppose each other constitutes the vibration direction of
the diaphragm 22.
[0046]
The housing 4 is provided with a ceiling plate portion 27 whose plane shape is substantially the
same as the plane shape of the frame 11, and a plurality of side plate portions 28 erected from
the outer edge of the ceiling plate portion 27. Is formed. The housing 4 is attached to the frame
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11, that is, the speaker unit 3 in such a manner that the ceiling plate 27 faces the diaphragm 22
attached to the frame 11 with a gap, and the side plate 28 overlaps the outer surface of the
frame 11. And covers the vibrating portion 10 of the speaker unit 3, that is, the diaphragm 22.
[0047]
The housing 4 is attached to the speaker unit 3 and housed in the earphone main body 2
together with the speaker unit 3. At this time, of course, the longitudinal directions of the
earphone body 2, the speaker unit 3, and the housing 4 are substantially parallel to each other.
As shown in FIG. 4, an opening 29 is provided in the tip end surface 4 a of the housing 4
positioned deepest in the external ear canal O when inserted into the external ear canal O. Of
course, the opening 29 penetrates the side plate portion 28 of the housing 4 and opens the
above-described tip surface 4 a. The opening 29 extends linearly along the longitudinal direction
of the voice coil 20 and the magnetic circuit unit 9 described above. The opening 29 radiates the
sound generated by the vibration of the diaphragm 22 of the vibrating portion 10 of the speaker
unit 3 to the back of the ear canal O along the longitudinal direction H through the inside.
[0048]
That is, the opening 29 is used to emit a sound generated by the vibration of the diaphragm 22
of the vibration unit 10 of the speaker unit 3 described above (that is, an opening for sound
emission). Further, the longitudinal direction of the opening 29 described above constitutes a
radiation direction H (indicated by an arrow in FIG. 1) of the sound generated when the
diaphragm 22 of the vibrating portion 10 vibrates. Thus, the voice coil 20 is disposed such that
its longitudinal direction is substantially parallel to the aforementioned radiation direction H.
[0049]
The housing 1 is attached to the speaker unit 3 so as to cover the diaphragm 22, and the housing
4 and the speaker unit 3 are accommodated in the earphone body 2 and assembled. Then, the
earphone 1 is inserted into the ear canal O, an audio current is supplied to the voice coil 20
through the lead wire 21, generates a sound corresponding to the audio current, and transmits
the sound to a person etc. .
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[0050]
According to the present embodiment, by fixing the voice coil 20 to the diaphragm 22, the
speaker unit 3 is a so-called dynamic type in which the voice coil 20 directly vibrates the
diaphragm 22. The vibration of the voice coil 20 is prevented from being attenuated until it is
transmitted to the diaphragm 22 as seen in a Riffel type speaker unit having a characteristic
contrary to the expansion of the bass reproduction band, and the diaphragm with a large
amplitude 22 can be vibrated, and a large sound pressure can be obtained.
[0051]
Further, since the voice coil 20 directly vibrates the diaphragm 22 in the speaker unit 3, the
lowest resonance frequency can be reduced, and a large reproduction band can be obtained from
the low to mid range and from the mid to high temperature range.
[0052]
Furthermore, since the diaphragm 22 of the speaker unit 3 separates the space on the front side
and the space on the back side of the diaphragm 22, sound waves generated on the back side of
the diaphragm 22 are the front side of the diaphragm 22. It is possible to suppress the decrease
in sound pressure and to obtain good acoustic characteristics by suppressing the mixing with the
sound waves generated on the side.
In addition, the output sound pressure frequency characteristic can be made flat from the low
tone range to the mid tone range, and from the middle tone range to the high tone range (the
occurrence of peak dip can be suppressed).
Therefore, the volume and the sound quality can be improved.
[0053]
Furthermore, the voice coil 20 is formed in a long flat plate shape, and the speaker unit 3 is
placed in the external ear canal O by arranging the longitudinal direction orthogonal to the
vibration direction S of the diaphragm 22 and parallel to the radiation direction H. The size can
be reduced to the size that can be inserted. Therefore, since the earphones 1 can be inserted into
the ear canal O, the reproduction sound can be efficiently provided without the earphones 1
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easily falling off the ear canal O.
[0054]
Therefore, the earphone 1 can be prevented from being easily detached from the ear while
improving the volume and the sound quality.
[0055]
In addition, since the earphone 1 can be inserted into the ear canal O, the sealing performance
can be improved by the earphone 1, particularly, the spherical portion 6 and the ear canal O.
[0056]
In the above-mentioned embodiment, although earphone main part 2 is provided with seat part 5
and spherical part 6, it is not limited to this, for example, spherical part 6 may have shapes, such
as an elliptical sphere, etc. Alternatively, as long as the earphone body 2 can be inserted into the
ear canal O or the sealing property with the ear canal O can be maintained, a known shape may
be used.
[0057]
Further, since the earphone 1 is provided with the voice coil accommodating portion 24 at the
central portion of the diaphragm main body 23 formed in the thin plate shape and the long flat
plate shape of the vibrating portion 10, the voice coil 20 and the diaphragm 22 are It can be
fixed, and the volume and sound quality can be improved.
[0058]
Furthermore, since the opening 29 for sound radiation is provided in the front end surface 4 a of
the housing 4, the sound generated by the speaker unit 3 can be easily guided into the ear canal
O.
[0059]
Further, since the earphone main body 2 accommodating the housing 4 and the speaker unit 3 is
provided, it is possible to prevent the speaker unit 3 and the like from being damaged, and
foreign matter from adhering and becoming dirty.
[0060]
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Furthermore, since the earphone body 2 is formed in a tubular shape, the speaker unit 3 and the
like can be accommodated without preventing the sound generated by the speaker unit 3 from
being guided into the ear canal O.
[0061]
Since the interval maintaining unit 17 for maintaining the interval between the magnets 13 of
the magnetic circuit unit 9 in which the different poles of the magnetic circuit unit 9 are disposed
opposite to each other, the voice coil 20 and the vibrating unit 10, that is, the longitudinal
direction of the earphone 1 The spacing between the magnets 13 is kept constant.
Therefore, it is possible to prevent the magnetic gap G formed by these magnets 13 from
becoming uneven (varied) in the longitudinal direction of the voice coil 20 and the vibrating
portion 10, ie, the earphone 1.
[0062]
Since the space holding portion 17 is made of a nonmagnetic material, the space holding portion
17 is excited, and the magnetic gap G formed by the magnet 13 is not in the longitudinal
direction of the voice coil 20 and the vibrating portion 10, ie, the earphone 1. It can suppress
becoming uniform (variation).
[0063]
Since the magnetic circuit unit 9 includes at least a pair of plates 14 superimposed on the
magnet 13 and the frame 11, the magnet 13 and the plate 14 are attached to the frame 11, so
the magnetic gap G formed by the magnet 13 is Unevenness (variation) in the longitudinal
direction of the voice coil 20 and the vibrating portion 10, that is, the earphone 1 can be
suppressed.
[0064]
Since the space ¦ interval holding ¦ maintenance part 17 is provided in the flame ¦ frame 11, the
increase in a number of parts can be suppressed and the cost increase can be suppressed.
[0065]
Since the lead wire 21 connected to the voice coil 20 is led to the outside along the width
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direction of the diaphragm 22 from the central portion in the longitudinal direction of the
diaphragm 22, the lead wire 21 is vibrated by the vibration of the diaphragm 22. It is possible to
suppress the application of tension (force to pull the lead wire) and to prevent the lead wire 21
from being damaged.
[0066]
In the embodiment described above, the pair of plates 14 is provided, but in the present
invention, a plurality of pairs of plates 14 may be provided as shown in FIG.
In the example shown in FIG. 7, without providing the yoke 12, two pairs of plates 14 (a total of
four plates 14 are provided) are provided, and the plates 14 are superimposed on the magnet 13.
Furthermore, in FIG. 7, the magnetic gap G is formed between the plates 14 of each pair (ie, two
magnetic gaps G are formed).
[0067]
In the example shown in FIG. 7, the magnetic fluid 30 is further filled between the pair of plates
14 and between the pair of plates 14 and the diaphragm 22.
The magnetic fluid 30 is configured by mixing magnetic powder in a viscous, semi-solid resin.
The magnetic fluid 30 generates abnormal noise due to contact between the plate 14 and the
diaphragm 22 or the voice coil 20 when an audio current is supplied to the voice coil 20, and
noise of the diaphragm 22 in the low frequency range Unnecessary vibration can be suppressed.
Also, by using the magnetic fluid 30, the magnetic flux density in the vicinity of the voice coil 20
can be increased.
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[0068]
In the case shown in FIG. 7, since the magnetic circuit unit 9 fills the magnetic fluid 30 between
the pair of plates 14 among the plurality of pairs of plates 14, the vibration of the diaphragm 22
is caused by the magnetic fluid 30. Since it is gradually damped, it is possible to prevent the
vibration of the diaphragm 22 from becoming uneven in the longitudinal direction of the
diaphragm 22, that is, it is possible to suppress the rolling of the diaphragm 22, etc., and noise is
generated. Can be deterred.
[0069]
In the example shown in FIG. 7, two pairs of plates 14 are provided, and the gel magnetic fluid
30 is filled between the pair of plates 14.
However, in the present invention, three or more pairs of plates 14 (i.e., a plurality of plates) may
be provided, and the gel magnetic fluid 30 may be filled between at least one pair of plates 14
among the plurality of plates 14.
[0070]
Further, in the example shown in FIG. 7, since the magnetic fluid 30 is filled between the pair of
plates 14, the back side of the speaker unit 3 (below the diaphragm 22) is sealed, so the sound in
the low frequency range It is possible to improve the characteristics, in particular to expand the
bass reproduction band.
[0071]
The inventors of the present invention confirmed the effect of the present invention by
calculating the vibration mode of the diaphragm 22 in a simulation.
The results of this simulation are shown in FIG.
In this simulation, the vibration mode of the diaphragm 22 was calculated.
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[0072]
According to FIG. 8, both ends in the longitudinal direction of the diaphragm 22 vibrate upward
in FIG. 8 (in the direction in which the diaphragm 22 approaches the ceiling plate portion 27 of
the housing 4), and the central portion in the longitudinal direction of the diaphragm 22. It
becomes clear that in FIG. 8 (in the direction in which the diaphragm 22 is away from the ceiling
plate 27 of the housing 4) (the occurrence of reverse resonance) downward in FIG.
[0073]
Therefore, as shown in FIG. 9, when the lead wire 21 is pulled out along the longitudinal
direction of the diaphragm 22 as in the comparative example shown in FIG. 9, an excessive
tension acts on the lead wire 21 to It becomes clear that there is a high possibility that the lead
wire 21 is broken, and as in the embodiment described above, the lead wire is extended by
extending in the width direction of the diaphragm 22 (direction substantially orthogonal to the
vibration direction of the diaphragm 22). It has become clear that breakage of the lead wire 21
can be suppressed without exerting excessive tension on the wire 21.
[0074]
According to the embodiment described above, the following ear-insertion type earphone 1 can
be obtained.
[0075]
(Supplementary Note) A speaker unit 3 having a housing 4 and a vibration unit 10 and a
magnetic circuit unit 9 attached to the housing 4, the vibration unit 10 including a diaphragm
22, a voice coil 20, and the like. The voice coil 20 is formed in a long flat plate shape, and the
longitudinal direction thereof is disposed substantially parallel to the radiation direction H of the
sound generated when the diaphragm 22 vibrates. Ear-insertion type earphone 1.
[0076]
According to the note, the voice coil 20 is directly fixed to the diaphragm 22 to make the speaker
unit 3 a so-called dynamic type to improve the volume and sound quality, and further to make
the voice coil 20 into a long flat plate shape. By forming the speaker unit 3 substantially parallel
to the radiation direction H of the sound generated when the diaphragm 22 vibrates, the speaker
unit 3 can be downsized to a size that can be inserted into the external ear canal O.
[0077]
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In addition, the Example mentioned above only showed the typical form of this invention, and
this invention is not limited to an Example.
That is, various modifications can be made without departing from the scope of the present
invention.
[0078]
FIG. 2 is a cross-sectional view of an ear-inserted earphone according to an embodiment of the
present invention.
It is a disassembled perspective view of the speaker unit of the ear-insertion type ¦ mold
earphone shown by FIG.
It is the disassembled perspective view which looked at the speaker unit shown by FIG. 2 from
the downward direction.
It is a perspective view of the speaker unit etc. which were shown by FIG.
It is sectional drawing in alignment with the VV line ¦ wire in FIG.
FIG. 3 is a plan view of a diaphragm of the speaker unit shown in FIG.
It is sectional drawing of the modification of the speaker unit shown by FIG.
It is explanatory drawing which shows the simulation result of the vibration mode of the
diaphragm of the speaker unit shown by FIG.
It is a top view of comparative examples, such as a diaphragm of a speaker unit.
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20
Explanation of sign
[0079]
DESCRIPTION OF SYMBOLS 1 ear insertion type earphone 2 earphone main body 3 speaker unit
4 housing 4 a tip end surface 9 magnetic circuit portion 10 vibration portion 11 frame 13
magnet 14 plate 17 spacing holding portion 20 voice coil 21 lead wire 22 diaphragm 23
diaphragm main body 24 voice Coil holder 29 Opening 30 Magnetic fluid H Radiation direction
O Ear canal
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