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JP2013157798

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2013157798
Abstract: A small-sized speaker capable of reproducing to a low frequency range, having a
diaphragm and a suspension, and having high assembly accuracy and improved reliability.
SOLUTION: A housing 111 having a magnet 11 inside, a plate 12 attached to the upper surface
of the magnet, and a voice coil 15 arranged so as to be able to vibrate vertically in a magnetic
gap 14 formed on the outer periphery of the plate. And a vibration plate 16 whose peripheral
edge portion 16b is joined to the upper end of the voice coil, and a suspension 117 connecting
the vibration plate and the housing, wherein the suspension is a portion fixed to the vibration
plate. 21 and a second fixing portion 22 which is a portion fixed to the housing, the second fixing
portion is positioned above the first fixing portion, and the first fixing portion vibrates in a top
view A speaker 110 which is disposed in an inner area D1 which is an area corresponding to the
inner side of the peripheral portion of the plate and which has at least one hole 90 in the
diaphragm 1 or the suspension. [Selected figure] Figure 1B
Speaker, hearing aid, inner ear headphone, portable information processing apparatus, and AV
apparatus
[0001]
The present invention relates to reducing the diameter of a small speaker.
[0002]
In recent years, with the development of digital hearing aids, hearing aids capable of higherquality listening have been realized by optimally correcting the ease of listening according to the
degree of hearing loss of the user.
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[0003]
Hearing aids, on the other hand, are a necessity in daily life and are worn and used continuously
over a long period of time.
Therefore, in order to make the hearing aid in which the user is not tired even when worn for a
long time, the hearing aid is required to be smaller.
Specifically, there is a demand for further miniaturization of a small speaker inserted in the ear
canal and used as a receiver for a hearing aid.
[0004]
In particular, in the case of an open fitting type hearing aid, it is necessary to secure an airway in
the ear canal, so downsizing of the receiver is important. In the open fitting type hearing aid, an
air passage is provided between the receiver and the ear canal, so that the receiver does not
completely close the ear canal when worn. As a result, it is possible to improve the wearing
feeling that the sound of one's own voice and the feeling of occlusion when worn in the ear canal
are small. Further, in the case of the open fitting type, the sound pressure level decreases with a
decrease in frequency below the lowest resonance frequency of the speaker, which makes it
difficult to reproduce the bass range. Therefore, there is a need for a small speaker with a low
minimum resonance frequency.
[0005]
At present, in a general hearing aid, a balanced armature type speaker, which is a type of
electromagnetic speaker, is used. The balanced armature type has a structure in which an
armature (movable iron piece) to which a diaphragm is connected is sandwiched between two
sets of coils and magnets. In a balanced armature type speaker, current is applied to each coil to
change the magnetic field in the armature. As a result, the armature held at the center of the
magnetic gap where the magnetic attraction forces of the two magnets are balanced vibrates, and
as a result, a sound wave is generated. The balanced armature type speaker can be miniaturized
because of its structure, but the width of the magnetic gap between the magnet and the armature
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is narrow, and it is difficult to reproduce a bass region requiring a large amplitude. Therefore,
there is an electrodynamic system as a system for realizing the reproduction of the bass range. In
the conventional electrodynamic system, since the lowest resonance frequency can be lowered by
selecting the material of the suspension, the bass range can be reproduced. However, when the
miniaturization required for the hearing aid is realized, the area of the diaphragm is reduced, or
the shape of the suspension is limited and the maximum amplitude is reduced. As a result, it has
been difficult to satisfy the miniaturization, the reproduction of the low frequency range and the
securing of the efficiency.
[0006]
Then, in order to solve the above-mentioned subject, a speaker of an electrodynamic system
indicated in patent documents 1 is proposed. FIG. 9 is a cross-sectional view showing the
structure of a conventional electrodynamic speaker described in Patent Document 1. As shown in
FIG. The conventional electrodynamic speaker shown in FIG. 9 includes a housing 111, a magnet
11, a plate 12, a voice coil 15, a diaphragm 16, and a suspension 17.
[0007]
With this structure, the diaphragm 16 and the suspension 17 are three-dimensionally arranged,
and therefore the area of the diaphragm 16 is not reduced by downsizing, and the shape of the
suspension 17 is not limited. As a result, it becomes possible to miniaturize the speaker, to
reproduce the low range, and to secure the efficiency.
[0008]
International Publication No. 2011/129108
[0009]
In the above-described conventional configuration, the diaphragm 16 and the suspension 17
form a three-dimensional structure.
Therefore, it is necessary to bond the diaphragm 16 and the suspension 17 in the first fixing
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portion 21. However, when an adhesive is applied to and adhered to the first fixing portion 21,
adhesion stagnation occurs in a part of the first fixing portion 21, and the entire surface of the
first fixing portion 21 is not adhered. Therefore, it was difficult to obtain sufficient adhesion.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to provide a small speaker
capable of reproducing a low frequency range having a diaphragm and a suspension whose
assembly accuracy is higher than that of the conventional one, in consideration of the abovementioned conventional problems.
[0011]
In order to achieve the above object, the speaker according to one aspect of the present invention
includes a housing having a magnet inside, a plate attached to the upper surface of the magnet,
and a magnetic gap formed on the outer periphery of the plate in the vertical direction A voice
coil disposed vibratable, a diaphragm having a peripheral edge joined to the upper end of the
voice coil, and a suspension for connecting the diaphragm and the housing, the suspension being
a portion fixed to the diaphragm And a second fixed portion which is a portion fixed to the
housing, the second fixed portion is positioned above the first fixed portion, and the first fixed
portion is an upper surface. The diaphragm or the suspension has at least one hole in the area of
the first fixing portion, which is disposed in an inner area corresponding to the inner side of the
peripheral edge of the diaphragm as viewed.
[0012]
According to this configuration, the surplus of the adhesive applied to the first fixing portion is
released from the hole provided in the first fixing portion to the outside, and adhesion stagnation
can not be made in the first fixing portion. Can be bonded well.
Further, by providing a hole in a portion of the diaphragm or the suspension, the mass of the
vibration system can be reduced, and the efficiency can be improved.
That is, according to the speaker of this aspect, for example, it is possible to secure the reliability
at the time of large-amplitude reproduction of the bass region while maintaining the diaphragm
area for achieving a predetermined sound pressure. Further, according to the speaker of this
aspect, for example, the reliability at the time of large amplitude reproduction of the bass region
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is secured without causing problems such as an increase in non-linearity of supporting force by
the suspension and an increase in stiffness of the suspension. can do.
[0013]
As described above, in the loudspeaker according to this aspect, distortion can be suppressed and
the lowest resonance frequency can be reduced due to the three-dimensional structure of the
diaphragm and the suspension, and the reliability can be improved as compared with the related
art.
[0014]
Further, in the speaker according to the aspect of the present invention, the holes may be
arranged in a mesh shape in the area of the first fixing portion.
That is, when a plurality of holes, for example, in the form of a mesh, are arranged in the first
fixing portion, the surplus portion of the adhesive applied to the first fixing portion is released
almost equally to the outside. It can be glued. In addition, when a material having a low UV
transmittance such as PEI (polyetherimide) and a UV curable adhesive are used for the
diaphragm and the suspension, only the diaphragm, the suspension, and the outer periphery of
the arranged hole are adhered. Therefore, the bonding area can be expanded by arranging a
plurality of holes, and the bonding strength can be improved.
[0015]
Further, in the speaker according to one aspect of the present invention, the materials of the
diaphragm and the suspension may be the same. That is, by using the same material, the
coefficient of thermal expansion and adhesion of the diaphragm and the suspension are the
same, so that the reliability can be secured.
[0016]
In the speaker according to one aspect of the present invention, the materials of the diaphragm
and the suspension may be different. That is, by using different materials, it is possible to use a
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material with a high elastic modulus for the diaphragm and a material with a low elastic modulus
for the suspension. As a result, a speaker with a wider reproduction band can be realized.
[0017]
Further, in the speaker according to one aspect of the present invention, the housing includes a
magnet, a plate, and a yoke having a side wall portion provided to surround the voice coil, and
the second fixing portion contacts the side wall portion. It may be located at According to this
configuration, since the yoke can be made to fix the end portion of the suspension on the
housing side, for example, the configuration of the speaker becomes simple.
[0018]
Further, in the speaker according to the aspect of the present invention, the diaphragm may have
a recess in a shape corresponding to the first fixing portion in the inner region. According to this
configuration, for example, the attachment of the first fixing portion to the diaphragm can be
performed accurately and easily.
[0019]
Further, in the speaker according to one aspect of the present invention, the suspension may be
divided into a plurality of radially extending portions in top view, and each of the plurality of
portions may have a second fixing portion. According to this configuration, for example, the
stiffness of the suspension is reduced. As a result, the lowest resonance frequency of the speaker
can be further reduced, and as a result, lower-range sound can be reproduced.
[0020]
Further, in the speaker according to one aspect of the present invention, the shape of the
diaphragm in top view may be elongated. According to this configuration, it is possible to realize,
for example, a small speaker having a shape that is elongated in the direction orthogonal to the
vibration direction of the diaphragm.
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[0021]
When a small speaker having such a shape is adopted as a speaker of a hearing aid or inner ear
headphone, for example, it is possible to configure the hearing aid or inner ear headphone so
that the diaphragm is inserted into the ear canal at the time of wearing. As a result, for example,
it becomes possible to clarify the sound transmitted to the user.
[0022]
In the speaker according to one aspect of the present invention, the three-dimensional shape of
the diaphragm may be a dome shape. According to this configuration, for example, the rigidity of
the entire diaphragm can be improved. Further, even when the thickness of the diaphragm is
reduced, predetermined rigidity can be maintained.
[0023]
In addition, the speaker according to an aspect of the present invention may further include a
magnetic fluid filled between the voice coil and the plate. According to this configuration, the
magnetic fluid is held between the plate and the voice coil by the magnetic field generated in the
magnetic gap. Thereby, even when the diaphragm is vibrated to a large extent, the diaphragm
can be stably vibrated without coming into contact with the housing and the plate due to the
viscosity of the magnetic fluid. Further, since the support portion of the diaphragm by the
magnetic fluid and the support portion by the second fixing portion are separated by a relatively
long distance in the vibration direction of the diaphragm, rolling of the diaphragm is effectively
performed. It is prevented.
[0024]
The present invention can also be realized as a hearing aid, an earbud headphone, a portable
information processing device, and an AV (Audio and Visual) device, each including the speaker
according to any aspect of the present invention.
[0025]
According to the present invention, it is possible to provide a small speaker capable of
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reproducing a bass range and having higher assembly accuracy and reliability than conventional
ones.
[0026]
It is a top view of the speaker in Embodiment 1 of the present invention.
It is a figure which shows the AA cross section in FIG. 1A.
It is a schematic diagram for demonstrating the arrangement position of the 1st adhering part
and the 2nd adhering part in Embodiment 1 of the present invention. It is a schematic diagram
for demonstrating the arrangement | positioning method of the hole on a suspension in
Embodiment 1 of this invention. It is sectional drawing of the speaker in Embodiment 2 of this
invention. It is a top view of a suspension. It is a figure which shows an example of the external
appearance of the hearing aid in Embodiment 3 of this invention. It is a cross-sectional enlarged
view of the receiver part in the hearing aid shown in FIG. It is a figure which shows an example of
the external appearance of the mobile telephone in Embodiment 4 of this invention. It is a figure
which shows an example of the external appearance of the flat-panel television in Embodiment 5
of this invention. It is sectional drawing which shows the structure of the conventional small
speaker of an electrodynamic system.
[0027]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. (Embodiment 1) The outline | summary of a structure of the speaker in Embodiment 1
of this invention is shown to FIG. 1A and 1B. FIG. 1A is a plan view of the speaker 110 according
to the first embodiment, and FIG. 1B is a view showing an AA cross section in FIG. 1A. In FIG. 1,
the same reference numerals are used for the same components as in FIG.
[0028]
The speaker 110 in the first embodiment includes a housing 111, a magnet 11, a plate 12, a
voice coil 15, a diaphragm 16, and a suspension 117. The material of the diaphragm 16 and the
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suspension 117 is PEI (polyetherimide). The outer diameter of the speaker 110 is, for example,
about 5 mm to 10 mm. More specifically, the speaker 110 in the first embodiment is configured
as follows.
[0029]
The housing 111 is composed of the yoke 10 and a yoke cover 19 for closing the opening
formed by the upper end edge of the side wall of the yoke 10. The yoke cover 19 is provided
with a sound hole 20. The plate 12 is attached to the upper surface of the magnet 11. Further,
the sound holes 13 are formed by the holes formed in the yoke 10, the magnet 11 and the plate
12, respectively. The voice coil 15 is disposed in the magnetic gap 14 formed on the outer
periphery of the plate 12 so as to be able to vibrate in the vertical direction. In the magnetic gap
14, the magnetic fluid 18 is filled between the plate 12 and the voice coil 15. The peripheral
portion 16 b of the diaphragm 16 is joined to the upper end of the voice coil 15, and vibrates as
the voice coil 15 vibrates. The suspension 117 is installed to connect the diaphragm 16 and the
housing 111. The suspension 117 has a first fixing portion 21 which is a portion fixed to the
diaphragm 16 and a second fixing portion 22 which is a portion fixed to the casing 111. A hole
90 is provided at the center of the first fixed portion 21 of the suspension 117. Moreover, as
shown to FIG. 1B, the 2nd adhering part 22 is located above the 1st adhering part 21. As shown
in FIG. Moreover, the recessed part 16a of the shape corresponding to the 1st adhering part 21 is
provided in the diaphragm 16, and the 1st adhering part 21 is adhered to the recessed part 16a.
The second fixed portion 22 is sandwiched between the side wall portion of the yoke 10 and the
yoke cover 19.
[0030]
The arrangement positions of the first fixing portion 21 and the second fixing portion 22 in the
present embodiment will be described with reference to FIG. FIG. 2 is a schematic diagram for
explaining the arrangement positions of the first fixing portion 21 and the second fixing portion
22 in the first embodiment. As shown in FIG. 2, the suspension 117 is divided into a plurality of
radially extending portions in top view. In the present embodiment, the suspension 117 is
divided into four parts of [1] to [4], and each part has a second fixing portion 22. In addition, the
first fixed portion 21 is disposed in the inner region D1 which is a region corresponding to the
inner side than the peripheral portion 16b, and the second fixed portion 22 is disposed in the
outer region D2 which is a region surrounding the inner region D1. ing. A hole 90 is disposed at
the center of the first fixing portion 21.
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[0031]
In the speaker 110 according to the first embodiment, for convenience, the case where the side
where the diaphragm 16 is disposed with respect to the magnet 11 is “upper” is illustrated
and described. In this case, the vibration direction of the diaphragm 16 is the vertical direction.
However, no matter what direction the speaker 110 faces, there is no substantial change in the
effect or the like that the speaker 110 has. The same is true for the other embodiments.
[0032]
The operation of the speaker 110 configured as described above will be described. The
mechanism for generating a sound wave is the same as that of the conventional example, and
when an electric signal is input to the voice coil 15, the voice coil 15 vibrates according to the
law of Fleming left hand. Since the voice coil 15 is joined to the diaphragm 16, sound waves are
generated from the diaphragm 16.
[0033]
According to the speaker 110 in the first embodiment of the present invention, the length of the
suspension 117 can be increased, and the stiffness can be reduced. Therefore, the lowest
resonance frequency is reduced, and low-range reproduction can be realized. Furthermore, by
increasing the length of the suspension 117, the non-linearity of the support system is improved
and distortion can be suppressed. In addition, since the suspension 117 is divided into a plurality
of portions that are radially extended in a top view, the stiffness is reduced, so that the lowest
resonance frequency of the speaker can be reduced. In this embodiment, although divided into
four, the number of divisions may be different, such as three or five.
[0034]
Also, the magnetic fluid 18 is held between the plate 12 and the voice coil 15 by the magnetic
field generated in the magnetic gap 14. Therefore, even when the vibrating plate 16 vibrates
largely, the vibrating plate 16 can vibrate stably without contacting the yoke 10 and the plate 12
due to the viscosity of the magnetic fluid 18.
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[0035]
The second fixing portion 22 is sandwiched between the side wall portion of the yoke 10 and the
yoke cover 19. In other words, by attaching the yoke cover 19 to the yoke 10, the end (second
fixed portion 22) of the end of the suspension 117 on the side of the housing 111 can be fixed,
so that, for example, the assembly process of the speaker 110 can be simplified.
[0036]
Moreover, since the three-dimensional shape of the diaphragm 16 is dome-shaped as shown to
FIG. 1B, for example, the rigidity as the whole diaphragm 16 can be improved. In addition, even
when the thickness of the diaphragm 16 is reduced, predetermined rigidity can be maintained.
Here, in the central portion of the dome-shaped diaphragm 16, a concave portion 16 a having a
shape corresponding to the first fixed portion 21 is provided. For example, the attachment
accuracy of the first fixed portion 21 to the diaphragm 16 is improved by the concave portion 16
a. The diaphragm 16 may not have the recess 16a. In this case, the first fixing portion 21 of the
suspension 117 is preferably formed into a curved shape along the dome shape of the diaphragm
16. The above effect is the same as that of the conventional speaker structure.
[0037]
The speaker 110 is mainly assembled using an adhesive. When the diaphragm 16 and the
suspension 117 are fixed, an adhesive is applied to the recess 16 a of the diaphragm. An excess
portion of the applied adhesive is discharged to the outside from a hole 90 provided in the first
fixing portion 21 of the suspension 117. As a result, the diaphragm 16 and the suspension 117
are uniformly fixed on the surface of the first fixed portion 21 as compared with the conventional
speaker structure in which the adhesion stagnation occurs in the first fixed portion 21. That is,
according to the speaker 110 of the present embodiment, the adhesion between the diaphragm
16 and the suspension 117 can be improved, adhesion peeling can be prevented during
vibration, and reliability can be improved. Further, by providing the holes 90, the mass of the
vibration system can be reduced, and the reproduction sound pressure can be improved. Further,
by providing the holes 90, the diaphragm 16 under the suspension 117 can be directly observed,
which facilitates positioning during assembly. Although the hole 90 is disposed at the center of
the suspension 117 in the present embodiment, it may not be disposed at the center as long as
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the excess adhesive can be released to the outside. In the present embodiment, the hole 90 has a
circular shape, but may have another shape such as an elliptical shape or a square shape.
[0038]
Although the hole 90 is provided on the suspension 117 in the present embodiment, it may be
provided on the diaphragm 16, and the same effect can be obtained. That is, the hole 90 may be
provided on the diaphragm 16 and the hole 90 may not be provided on the suspension. Also,
when the holes are provided on the diaphragm 16, the holes may be provided on the suspension
117 at positions not overlapping the holes provided on the diaphragm 16. The holes may be
formed in a plurality or a mesh instead of one. The arrangement of the holes is shown in FIG. A
plurality of holes 92 are disposed in the first fixing portion 93 on the suspension 95 and fixed to
the casing 111 by the second fixing portion 94. By providing the plurality of holes 92, the excess
adhesive can be released more uniformly, and the adhesion is improved.
[0039]
Furthermore, for example, in the case of using a material with low ultraviolet light transmittance
such as PEI (polyetherimide) as the material of the diaphragm 16 and the suspensions 95 and
117, the diaphragm 16 and the suspension 95 may Only the vicinity of the interface of 117 is
adhered. By arranging the holes, the vicinity of the outer periphery of the holes is further
adhered. That is, when the plurality of holes 92 or mesh shape is used, the vicinity of the outer
peripheral portion of each hole 92 is adhered, and the adhesion area can be expanded as a
whole, and the adhesion can be improved. Although the diaphragm 16 and the suspensions 95
and 117 are made of the same material in the present embodiment, different materials may be
used. For example, the reproduction band can be expanded by using a material having a high
elastic modulus for the diaphragm 16 to improve high-frequency reproduction, and using a
material having a low elastic modulus for the suspensions 95 and 117 to reduce the lowest
resonance frequency. It becomes possible.
[0040]
Second Embodiment An outline of the configuration of a speaker according to a second
embodiment of the present invention is shown in FIGS. 4A and 4B. FIG. 4A is a cross-sectional
view of speaker 130 in the second embodiment, and FIG. 4B is a plan view of suspension 37.
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[0041]
Loudspeaker 130 according to the second embodiment includes housing 131 formed of yoke 30
and yoke cover 39, magnet 31, plate 32, sound hole 33, and magnetic gap 34 formed on the
outer periphery of plate 32. A voice coil 35 disposed so as to be able to vibrate in the vertical
direction in the magnetic gap 34, a rectangular diaphragm 36, a hole 91 at the center, and a
suspension 37 having a roll-shaped cross section at the end, a magnetic gap The magnetic fluid
38 is filled in the space 34 between the plate 32 and the voice coil 35. The yoke cover 39 is
provided with a sound hole 100.
[0042]
Further, the suspension 37 has a first fixing portion 101 which is a portion fixed to the
diaphragm 36 and a second fixing portion 102 which is a portion fixed to the casing 131. In
addition, the first fixed portion 101 is disposed in an inner region which is a region inside the
peripheral portion 36a of the diaphragm 36 in top view, and the second fixed portion 102 is
outside the inner region in top view. It is arranged in the area. Specifically, the second fixed
portion 102 is sandwiched between the side wall portion of the yoke 30 and the yoke cover 39.
[0043]
The operation of the speaker 130 configured as described above will be described. The
mechanism by which sound is generated from the diaphragm 36 when an electric signal is
applied to the voice coil 35 is the same as that of the first embodiment. A great difference
between the speaker 130 of the second embodiment and the speaker 110 of the first
embodiment is that the shape of the diaphragm 36 in a top view is a long shape. Specifically, in
the present embodiment, the shape of the diaphragm 36 in top view is rectangular. According to
the shape of the diaphragm 36, the suspension shape for supporting the diaphragm 36 is such
that the first fixing portion 101 is formed in a flat shape in accordance with the diaphragm
shape, and both ends are formed in a roll shape. Furthermore, a hole 91 is provided in the first
fixed portion 101 on the suspension 37. Here, the suspension 37 is three-dimensionally disposed
on the diaphragm 36. That is, since the length of the suspension 37 can be increased, the
stiffness can be reduced, the low-pass reproduction can be realized, and the non-linearity of the
support system can be improved, and the distortion can be suppressed as in the first
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embodiment. It is. Also, by arranging the hole 91 in the first fixing portion 101 on the suspension
37, the surplus adhesive can be released to the outside when the diaphragm 36 and the
suspension 37 are adhered, and the adhesion can be improved. It is the same as Form 1 of
[0044]
With the rectangular parallelepiped shape, it is possible to realize a speaker 130 having a
narrower width than that of the first embodiment. When this speaker 130 is adopted as an audio
output device of a hearing aid or inner ear headphone, for example, it is possible to configure a
hearing aid or inner ear headphone so that the diaphragm 36 is inserted into the ear canal at the
time of wearing. As a result, the vibration effective area in the inside of the ear canal is improved,
and for example, the sound transmitted to the user can be clarified.
[0045]
In the present embodiment, the suspension 37 is disposed in the long side direction of the
diaphragm 36, but may be disposed in the short side direction. In this case, although the effective
area of the diaphragm 36 is smaller than that disposed in the long side direction, the length of
the suspension 37 supporting the diaphragm 36 becomes longer, so the diaphragm can be
supported more stably. . In any case, it is possible to realize the speaker 130 capable of achieving
both the reproduction of the low tone range and the miniaturization.
[0046]
Moreover, the diaphragm 36 should just be elongate in top view, and shapes other than a
rectangle may be sufficient as it. The shape of the diaphragm 36 in a top view may be, for
example, a shape with rounded corners of a rectangle, or may be an ellipse. Also, the threedimensional shape of the housing 131 does not have to be a rectangular parallelepiped as shown
in FIGS. 4A and 4B, and may be a long thin shape as a whole. Further, the shape of the hole 91
does not have to be rectangular as shown in FIG. 4B, and may be round or elliptical as in the first
embodiment. Further, the number of holes may be plural, and the shape may be mesh. Further, in
the present embodiment, the hole 91 is provided in the suspension 37, but may be provided on
the diaphragm side. Further, in the present embodiment, the suspension 37 is an integral body,
but may be divided into two. Depending on the shape of the speaker, the weight of the vibration
system can be further reduced, leading to an improvement in efficiency. Further, different
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materials may be used for the diaphragm 36 and the suspension 37, and the same effect as that
of the first embodiment can be obtained.
[0047]
Third Embodiment Hearing Aid Next, an example of a device equipped with a speaker according
to any aspect of the present invention will be described. First, a hearing aid 150 equipped with
the speaker 110 according to the first embodiment will be described as the third embodiment.
[0048]
FIG. 5 is a view showing an example of the appearance of the hearing aid 150 in the third
embodiment. Note that FIG. 5 shows the appearance of the hearing aid 150 attached to the user's
pinnae 42. The hearing aid 150 shown in FIG. 5 includes a receiver unit 40, a lead tube 41, and a
hearing aid body 43.
[0049]
FIG. 6 is an enlarged cross-sectional view of the receiver unit 40 in the hearing aid 150 shown in
FIG. The receiver unit 40 has an ear tip 45, a vent 44, an ear tip coupling portion 46, a receiver
47, and a lead tube coupling portion 48. In the present embodiment, the speaker 110 in the first
embodiment is employed as the receiver 47, but the details of the speaker 110 are as described
in the first embodiment, and the description thereof is omitted here. Further, the cross section
when the speaker 110 is adopted as an audio output device in the inner ear headphones is also
similar to the cross sectional structure shown in FIG. 6, for example, and the ear tip 45 etc. for
wearing on the user is provided in the inner ear headphones. Be
[0050]
The hearing aid 150 using the speaker 110 can be roughly divided into two as components. One
is a hearing aid main body 43 attached to the ear so as to be located above the auricle 42 and on
the back of the auricle 42, and the other is a receiver portion 40 located in at least one of the
inside of the ear canal and the ear canal opening. It is.
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[0051]
The operation of the hearing aid 150 configured as described above will be described. A
microphone disposed in the hearing aid main body 43 converts an input sound into an input
sound signal, and transmits it to a signal processing unit provided in the hearing aid main body
43. In the signal processing unit, the input sound signal is processed to generate an output sound
signal. The generated output acoustic signal is transmitted to the receiver 47 through the lead
tube 41. The receiver 47 converts the output sound signal into an output sound, and reproduces
the output sound from the diaphragm 16 through the sound hole 13 and the ear tip 45 to the
user. Thus, the receiver 47 in the present embodiment operates as a speaker that reproduces the
output acoustic signal in the hearing aid 150.
[0052]
Here, the problems with general hearing aids include the sound of the user's own voice and the
feeling of occlusion when worn, which is due to the fact that the hearing aid seals the ear canal.
[0053]
In the present embodiment, the diaphragm 16 and the suspension 17 are three-dimensionally
arranged in the receiver 47 (speaker 110) (see, for example, FIG. 1B), so that the outer diameter
of the receiver 47 is smaller than that in the related art.
As a result, it is possible to secure an air passage by the air vent 44 between the wall surface of
the ear canal and the receiver 47, and an open fitting type hearing aid 150 which does not seal
the ear canal is realized. Furthermore, the length of the suspension 17 can be made longer than
in the conventional structure. Therefore, the stiffness of the suspension 17 can be reduced, and
as a result, the lowest resonance frequency is lowered. That is, even with the open fitting type, a
high-quality hearing aid 150 capable of sufficiently reproducing the low tone range is realized.
[0054]
The hearing aid 150 may include the speaker 130 according to the second embodiment instead
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of the speaker 110 according to the first embodiment as the receiver 47. For example, when the
hearing aid 150 includes the speaker 130 according to the second embodiment as the receiver
47, as described above, the hearing aid 150 can be configured such that the diaphragm 36 is
inserted into the ear canal at the time of wearing. The same applies to the inner ear headphones,
and either of the speakers 110 and 130 may be adopted as an audio output device in the inner
ear headphones.
[0055]
Fourth Embodiment Mobile Terminal Device Next, as a fourth embodiment, an example of a
mobile terminal device equipped with a speaker according to any aspect of the present invention
will be described.
[0056]
FIG. 7 is a diagram showing an example of the appearance of the mobile phone 160 according to
the fourth embodiment.
The mobile phone 160 shown in FIG. 7 is an example of the mobile information processing
apparatus of the present invention. A mobile phone 160 shown in FIG. 7 includes an upper case
50, a lower case 51, a liquid crystal screen 52, a hinge 53, a speaker 54, and a sound hole 55.
[0057]
The mobile phone 160 shown in FIG. 7 is a foldable body whose main body is composed of an
upper case 50 and a lower case 51. The upper housing 50 and the lower housing 51 are
rotatably connected centering on the hinge portion 53. In the upper housing 50, a liquid crystal
screen 52 is provided on the front. The speaker 54 is inside the upper housing 50 and is
disposed above the liquid crystal screen 52. As the speaker 54, although the description is not
described in detail here because the description is duplicated, for example, the speaker 110 of
the first embodiment described using FIG. 1A and FIG. 1B is adopted. Specifically, the speaker
110 is mounted such that the sound hole 13 or the sound hole 20 shown in FIG. 1B is connected
to the sound hole 55 of the upper housing 50 of FIG. 7. The speaker 130 of the second
embodiment may be adopted as the speaker 54.
12-05-2019
17
[0058]
The operation of the mobile phone 160 configured as described above will be described. In the
mobile phone 160, the signal received by the antenna is processed by the signal processing unit,
input as a reception signal to the speaker 54, and the reception sound is reproduced by the
speaker 54. Although not illustrated in FIG. 7, the antenna and the signal processing unit are
provided in the mobile phone 160 as basic components. As described above, in the present
embodiment, the speaker 54 is a speaker that reproduces a received sound by the mobile phone
160, and operates as an acoustic transducer called a receiver.
[0059]
In general mobile phones in recent years, since the liquid crystal screen is large, the mounting
position of the receiver is near the upper outer frame of the housing. As a result, it has become
difficult to close the ear with a housing so that the sound emitted from the receiver does not leak
to the outside, and to use it in a nearly sealed state. Therefore, the sound pressure level drops
below the lowest resonance frequency of the receiver, making it difficult to reproduce low
frequencies.
[0060]
According to the mobile phone 160 in the present embodiment, it is possible to reduce the lowest
resonance frequency of the receiver (for example, the speaker 110). Therefore, even if the sealed
state between the portable telephone 160 and the ear can not be maintained, the decrease in
sound pressure level is small until the lowest resonance frequency, for example, if the lowest
resonance frequency is set to around 300 Hz. Flat sound pressure characteristics are realized up
to the frequency band.
[0061]
As described above, in the mobile phone 160, the received sound quality of the received sound is
significantly improved as compared with the conventional mobile phone. That is, the mobile
phone 160 of the present embodiment has high practicability as a recent mobile phone in which
the attachment position of the receiver is brought close to the upper surface of the upper
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18
housing 50 by the enlargement of the liquid crystal screen 52. In addition, the mobile phone 160
also has high practicability as a fourth generation mobile phone in which the reproduction band
of the low frequency band of the call signal is to be greatly expanded.
[0062]
(Fifth Embodiment: Flat Television) Next, as a fifth embodiment, an example of a flat television
equipped with the speaker according to any aspect of the present invention will be described.
[0063]
FIG. 8 is a diagram showing an example of the appearance of the flat-screen television 170 in the
fifth embodiment.
A flat-screen television 170 shown in FIG. 8 is an example of the AV apparatus of the present
invention, and includes a television case 60, a display unit 61, and a speaker 200 in which a
plurality of speaker units are arranged.
[0064]
The display unit 61 is realized by, for example, a PDP (Plasma Display Panel), a liquid crystal
display panel, or an organic EL display panel. In addition, the speaker 200 is inside the television
case 60 and is provided, for example, on both sides of the display unit 61. As the speaker 200,
for example, a plurality of the speakers 130 of the second embodiment described with reference
to FIGS. 4A and 4B are used.
[0065]
By arranging a plurality of narrow speakers 130 in the longitudinal direction and using them, a
thin frame television 170 with a narrow frame can be realized. Also, by making the suspension
37 longer, the low resonance frequency of the speaker 130 can be reduced, and the viscosity of
the magnetic fluid 38 filled in the magnetic gap 34 can hold the voice coil 35, thereby
reproducing the bass region. It is. That is, when the speaker 130 is used, it is possible to realize a
narrow-frame flat-screen television 170 which is excellent in reproduction of a low tone range.
12-05-2019
19
[0066]
The speakers 110 and 130, the hearing aid 150, the inner ear headphones, the portable
information processing apparatus, and the AV apparatus of the present invention have been
described above based on the first to fifth embodiments. However, the present invention is not
limited to the above embodiments. The scope of the present invention also includes various
modifications that can be conceived by those skilled in the art without departing from the spirit
of the present invention, or embodiments configured by combining the plurality of components
described above. include. For example, the speaker 110 may be provided in an AV apparatus
such as the flat-screen television 170 of the fifth embodiment.
[0067]
In addition, the speaker 110 may not include the magnetic fluid 18 as long as the voice coil 15 is
arranged to be able to vibrate in the vertical direction on the outer periphery of the plate 12. The
same is true for the other speakers 130 that the magnetic fluid 38 is not essential.
[0068]
Further, in the fourth embodiment, the portable telephone 160 is illustrated as a portable
information processing apparatus provided with the speaker according to any aspect of the
present invention. However, the portable information processing device of the present invention
can be realized as various portable devices other than portable telephones such as portable
personal computers.
[0069]
The AV device of the present invention can also be realized as various devices other than a
television, such as a radio receiver, for example.
[0070]
12-05-2019
20
As described above, according to the present invention, by providing a hole for releasing the
excess adhesive in the fixing portion of the diaphragm and the suspension, the diaphragm and
the suspension that constitute the three-dimensional structure can be sufficiently bonded.
Further, by providing a hole in a portion of the diaphragm or the suspension, the mass of the
vibration system can be reduced, and the efficiency can be improved.
[0071]
The speaker according to the present invention is small in size and can reproduce the lowpitched range even if it is slim, and is highly reliable. Therefore, the open fitting type hearing aid
and the inner ear headphones, and the portable telephone which can not keep the receiver
closed. A portable terminal device such as a telephone can be realized as a small-sized, highly
reliable receiver capable of reproducing up to the low tone range.
[0072]
An audio device capable of high-quality, low-frequency reproduction by adopting the speaker of
the present invention as a speaker of an audio device such as a flat-screen television including a
liquid crystal display panel, PDP, or organic EL display panel etc. Can be realized.
[0073]
10, 30 Yoke 11, 31 Magnet 12, 32 Plate 15, 35 Voice Coil 16, 36 Diaphragm 18, 38 Magnetic
Fluid 17, 37, 95, 117 Suspension 13, 20, 33, 55, 100 Sound Hole 14, 34 Magnetic Air gap 16a
Recess 16b, 36a Peripheral part 19, 39 Yoke cover 21, 93, 101 First fixed part 22, 94, 102
Second fixed part 40 Receiver part 41 Lead tube 43 Hearing aid body 44 Air hole 45 Ear tip 46
Ear tip joint Part 47 Receiver 48 Lead tube joint part 50 Upper case 51 Lower case 52 LCD
screen 53 Hinge part 54, 110, 130, 200 Speaker 60 TV case 61 Display part 111, 131 Case 150
Hearing aid 160 Mobile phone 170 Flat-screen TV
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