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JP2008177692

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DESCRIPTION JP2008177692
The present invention relates to an elongated conductive type speaker for use in a small portable
device such as a portable telephone, and since the voice coil is also elongated in an oval shape,
the strength on the long side of the voice coil is weak. The generation of abnormal sound due to
the divided vibration in the frequency band of the range, the defects such as the distortion rate
deterioration occur. A conductive type electroacoustic system having a magnetic circuit
comprising a permanent magnet, a yoke fixed to one magnetic pole side of the permanent
magnet, a top plate fixed to the other magnetic pole side, and a vibrating film provided with a
voice coil. In the converter, the voice coil is formed in an elongated shape having a long side and
a short side, and a magnetic gap forming the magnetic circuit is also formed in an elongated
shape having a long side and a short side, A short side of the voice coil is connected by a
reinforcing member. [Selected figure] Figure 1
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer, and more particularly to an
electroacoustic transducer of a conductive type provided with a voice coil having a long side and
a short side as a voice coil shape.
[0002]
In recent years, the audio function has been emphasized in small portable devices such as mobile
phones, and as an electroacoustic transducer, an electrodynamic electroacoustic transducer that
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emphasizes acoustic characteristics from a piezoelectric type aiming only for a simple call sound
has been developed. It has come to be installed.
Moreover, since these small portable devices take up space for display devices and keyboards,
the space for attaching the electroacoustic transducers is becoming narrower and smaller, and
the conventional circular electroacoustic transducers can not be attached.
[0003]
As a countermeasure for this, there is a configuration in which an elongated electroacoustic
transducer is attached to a portable telephone avoiding a large-sized display device. (See, for
example, Patent Document 1).
[0004]
Hereinafter, the electroacoustic transducer in the prior art disclosed in Patent Document 1 will be
described with reference to FIGS. 12 and 13. FIG. 12 is a front view of a mobile phone provided
with an electroacoustic transducer according to the prior art disclosed in Patent Document 1, and
FIG. 13 is a perspective view of a voice coil constituting the electroacoustic transducer of FIG. In
FIG. 12, reference numeral 100 denotes a mobile phone, and a display unit 111, a microphone
112, a cover 110 having a conductive speaker 60 which is an electro-acoustic transducer, and a
main unit 120 having a keyboard 121 and function buttons 122 are hinges 130. It is connected
so as to be openable and closable.
[0005]
In the lid portion 110, the display device 111 where a display screen as wide as possible is
desired occupies most of the area, and the elongated conductive speaker 60 is in the narrow gap
between the display device 111 and the hinge portion 130. It is arranged. FIG. 13 shows a voice
coil 64 constituting the conductive speaker 60. The shape of the voice coil 64 is rectangular in
accordance with the elongated shape of the conductive speaker 60. As shown in FIG. That is, the
length L1 of the long side 64a of the voice coil 64 is a slender shape which is twice or more the
length L2 of the short side 64b.
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[0006]
Patent No. 38412222 (page 23, FIG. 26, FIG. 36)
[0007]
However, generally, the voice coil of the conductive speaker is generally circular.
The balanced circular shape at the time of driving the conductive speaker makes the stress
applied to each part of the voice coil uniform, so that a normal sound output can be generated.
[0008]
However, since the voice coil 64 of the conductive speaker 60 in Patent Document 1 has an
elongated shape in which the ratio of the length L1 of the long side 64a to the length L2 of the
short side 64b is twice or more, Due to this unbalanced shape when driving the type speaker,
there is a problem that the stress applied to each part of the voice coil becomes uneven, and a
normal sound output can not be generated. That is, due to the insufficient strength of the long
side portion 64a of the voice coil 64, problems such as generation of abnormal sound due to
divided vibration and deterioration of distortion factor occur in the middle frequency band.
[0009]
(Object of the Invention) The present invention has been made in view of the above problems,
and while having a slender shape capable of being disposed in a narrow space of a portable
device etc., generation of abnormal sound due to divided vibration in a mid frequency band It is
an object of the present invention to provide an electroacoustic transducer in which the
occurrence of defects such as deterioration in distortion rate is improved.
[0010]
An electroacoustic transducer according to the present invention for achieving the above object
comprises a magnetic circuit comprising a permanent magnet, a yoke fixed to one magnetic pole
side of the permanent magnet, a top plate fixed to the other magnetic pole side, and a voice coil.
In the electro-acoustic transducer of the conductive type having a vibrating membrane, the voice
coil is formed in an elongated shape having a long side and a short side, and a magnetic gap
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forming the magnetic circuit is also a long side and a short side. And the short side of the voice
coil is connected by a reinforcing member.
[0011]
With the above configuration, by reinforcing the lack of strength on the long side of the voice
coil, it is possible to suppress the occurrence of abnormal sound due to divided vibration in the
middle frequency band and the occurrence of distortion rate deterioration. I was able to improve
it.
[0012]
The reinforcing member may be attached to the upper surface of the voice coil and disposed on
the lower surface side of the vibrating membrane.
[0013]
The magnetic circuit is characterized in that a slit is provided in the vicinity of a central portion
on the short side, and a reinforcing member attached to the lower surface side of the voice coil is
accommodated in the slit.
[0014]
The magnetic circuit is divided into two by the slit.
[0015]
As described above, a three-dimensional reinforcing member that can be reinforced in the height
direction of the voice coil is provided by providing a slit at a position corresponding to the
reinforcing member of the magnetic circuit to accommodate the reinforcing member that
vibrates when the electroacoustic transducer is driven. As a result, sufficient acoustic
characteristics could be improved.
[0016]
As described above, according to the electro-acoustic conversion of the present invention,
generation of abnormal sound due to divided vibration in the middle frequency band and
generation of distortion rate deterioration by reinforcing the insufficient strength on the long
side of the voice coil Could be suppressed, and the acoustic characteristics could be improved.
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[0017]
Hereinafter, an electroacoustic transducer in an embodiment of the present invention will be
described in detail with reference to the drawings.
1 to 3 show the configuration of the electroacoustic transducer according to the first
embodiment of the present invention. FIG. 1 is a sectional view of the electroacoustic transducer,
FIG. 2 is a top view of the electroacoustic transducer, FIG. FIG. 6 is a perspective view of a voice
coil of the electroacoustic transducer.
[0018]
In FIG. 1 and FIG. 2, reference numeral 10 denotes a conductive speaker which is an electroacoustic transducer, which has an elongated shape like the conventional conductive speaker 60.
1 is a permanent magnet, 2 is a yoke fixed to one magnetic pole side of the permanent magnet 1,
3 is a top plate fixed to the other magnetic pole side of the permanent magnet 1, and the
permanent magnet 1, yoke 2 and top plate 3 It constitutes a magnetic circuit.
4 is a voice coil, 5 is a reinforcing member connecting the short side of the voice coil 4 and will
be described later in detail.
The reference numeral 6 denotes a vibrating membrane provided with a voice coil 4 and the
reference numeral 7 denotes a frame.
A protector 8 has a function of bonding to the frame 7 to hold the vibrating membrane 6
therebetween and protecting the upper surface side of the vibrating membrane 6.
The operation of the conductive speaker 10 is basically the same as that of the conventional
conductive speaker, and by energizing the voice coil 4 disposed in the magnetic gap 9 formed by
the yoke 2 and the top plate 3. , And the diaphragm 6 vibrates to generate an acoustic output.
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[0019]
FIG. 3 is a perspective view of the voice coil 4. The voice coil 4 has an oval shape, but like the
conventional voice coil 64, the length L1 of the long side 4a and the length L2 of the short side
4b It has an elongated shape with a ratio of 2 or more.
Therefore, it is the same as in the prior art that there is a problem that the stress applied to each
part of the voice coil becomes uneven due to this unbalanced shape when driving the conductive
speaker, and a normal sound output can not be generated.
In order to solve this problem in the present invention, a reinforcing member 5 for connecting
the short side 4b of the voice coil 4 is provided. The reinforcing member 5 is configured to
connect between the center positions of the long sides 4a of the voice coil 4. In the present
embodiment, a lightweight and strong resin material is used. Specifically, the voice coil 4 is
formed of a thin plate-like reinforcing member 5 by bonding a molded article of PPA
(polyphthalamide) resin used for the frame 7 to the voice coil 4 using an acrylic UV adhesive. The
top side of the is firmly connected. That is, the reinforcing member 5 is provided on the lower
surface side of the vibrating membrane 6, and is disposed in a space portion provided on the
upper surface of the voice coil 4 and the lower surface side of the vibrating membrane 6.
[0020]
By firmly connecting the short side 4b of the voice coil 4 with the reinforcing member 5 as
described above, the lack of strength of the long side 4a of the voice coil 4 is improved, and an
abnormality due to divided vibration occurs in the middle frequency band. Problems such as
generation of sound and deterioration of distortion rate no longer occur.
[0021]
Next, the configuration of an electroacoustic transducer according to a second embodiment of
the present invention will be described with reference to FIGS. 4 to 6.
FIG. 4 is a cross-sectional view of the electroacoustic transducer, FIG. 5 is a top view of the
electroacoustic transducer, and FIG. 6 is a perspective view of a voice coil of the electroacoustic
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transducer. In FIG. 4 and FIG. 5, reference numeral 20 denotes a conductive type speaker which
is an electroacoustic transducer, and the basic configuration is the same as the conductive type
speaker 10 of the first embodiment shown in FIG. And duplicate explanations will be omitted.
[0022]
4 and 5 differs from the conductive speaker 10 in that the permanent magnet is divided into two
to form permanent magnets 1a and 1b, and the top plate is also divided into two and the top
plate 3a, By being 3b, the magnetic circuit is divided into two near the center on the long side,
and the slit 21 is formed therebetween. A reinforcing member 25 is attached to the inner surface
side of the voice coil 14, and the reinforcing member 25 is accommodated in the slit 21.
[0023]
Here, the attachment structure of the reinforcing member 25 to the voice coil 14 will be
described with reference to FIG. In the voice coil 4 shown in FIG. 3, the upper surface side of the
voice coil 4 is strongly connected by the thin plate-like reinforcing member 5, while in the voice
coil 14 in the present embodiment, the three-dimensional reinforcing member 25 is used on the
inner surface side. It is firmly connected. That is, since the three-dimensional reinforcing member
25 can reinforce the voice coil 14 in the height direction, the effect of improving the strength of
the long side portion 14 a of the voice coil 14 is extremely high.
[0024]
However, when the three-dimensional reinforcing member 25 is provided on the inner surface
side of the voice coil 14 as shown in FIG. 4, this reinforcing member 25 is disposed at a position
where it collides with the top plate and the permanent magnet constituting the magnetic circuit. .
In the present invention, in order to solve this problem, the magnetic circuit is divided into two to
form the slit 21, and the reinforcing member 25 is accommodated in the slit 21. That is, when
the vibrating film 6 vibrates to generate an acoustic output by energizing the voice coil 14, the
three-dimensional reinforcing member 25 also moves in the slit 21 as the voice coil 14 can move
in the magnetic gap 9. It is possible. The reinforcing member 25 is made of the same PPA resin
as that of the reinforcing member 5, and the same adhesion is performed.
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[0025]
Next, the configuration of an electroacoustic transducer according to a third embodiment of the
present invention will be described with reference to FIGS. 7 to 9. 7 is a sectional view of the
electroacoustic transducer, FIG. 8 is a top view of the electroacoustic transducer, and FIG. 9 is a
perspective view of a voice coil of the electroacoustic transducer. In FIG. 7 and FIG. 8, the
reference numeral 30 denotes a conductive speaker which is an electroacoustic transducer, and
the basic configuration is the same as the conductive speaker 10 of the first embodiment and the
conductive speaker 20 of the second embodiment The same reference numerals will be assigned
to, and duplicate explanations will be omitted.
[0026]
In the conductive type speaker 30 shown in FIGS. 7 and 8, the permanent magnet 1 is the same
as the conductive type speaker 20 except that only the top plate is divided into two to become
the top plates 3a and 3b. The part is divided into two, and the slit 31 is formed between them. A
reinforcing member 35 is attached to the voice coil 24 at one portion on the upper surface and
the inner surface side, and the reinforcing member 35 is accommodated in the slit 31.
[0027]
Here, the attachment structure of the reinforcing member 35 to the voice coil 24 will be
described with reference to FIG. While the voice coil 14 shown in FIG. 4 is reinforced over the
entire height direction of the voice coil 14 by the three-dimensional reinforcing member 25, the
three-dimensional reinforcing member slightly thinner than the reinforcing member 25 in this
embodiment. At 35, the upper surface of the voice coil 24 and one portion on the inner surface
side are firmly connected. That is, the thickness of the three-dimensional reinforcing member 35
is reduced by the amount by which the slits 31 become shallow, and the collision between the
reinforcing member and the magnetic circuit is avoided.
[0028]
Next, the configuration of an electroacoustic transducer according to a fourth embodiment of the
present invention will be described with reference to FIGS. 10 and 11. FIG. FIG. 10 is a cross-
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sectional view of the electroacoustic transducer, and FIG. 11 is a top view of the electroacoustic
transducer. In FIG. 10 and FIG. 11, reference numeral 40 denotes a conductive speaker which is
an electroacoustic transducer, and the basic configuration is the same as the conductive speaker
20 of the second embodiment and the conductive speaker 30 of the third embodiment. The same
reference numerals will be assigned to, and duplicate explanations will be omitted.
[0029]
The conductive speaker 40 shown in FIGS. 10 and 11 differs from the conductive speaker 30 in
that the top plate is divided into two to form the top plates 3 a and 3 b, and a groove is provided
in a part of the permanent magnet 1. One part of the magnetic circuit is divided into two, and a
slit 41 is formed therebetween. A reinforcing member 45 is attached to the voice coil 34 at one
portion on the inner surface side, and the reinforcing member 45 is accommodated in the slit 41.
[0030]
That is, the height of the reinforcing member 45 in the conductive speaker 40 is about half the
height of the reinforcing member 25 in the conductive speaker 20, and the depth of the slit 41 is
reduced by that amount. As a result, one part of the permanent magnet 1 can be left by grooving
without being completely separated. The material and processing method of the reinforcing
member 45 can be prepared in the same manner as the reinforcing member 25.
[0031]
As described above, the electro-acoustic transducer according to the present invention reinforces
the lack of strength on the long side by connecting the short side of the elongated voice coil with
the reinforcing member, and therefore the divisional vibration in the middle frequency band It is
possible to suppress the occurrence of abnormal sound and the occurrence of distortion and to
improve the acoustic characteristics.
[0032]
It is a sectional view of an electroacoustic transducer in a 1st embodiment of the present
invention.
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It is a top view of an electroacoustic transducer in a 1st embodiment of the present invention. It
is a perspective view of the voice coil in the electroacoustic transducer shown to FIG. 1, FIG. It is
sectional drawing of the electroacoustic transducer in 2nd Embodiment of this invention. It is a
top view of the electroacoustic transducer in 2nd Embodiment of this invention. It is a
perspective view of the voice coil in the electroacoustic transducer shown to FIG. 4, FIG. It is
sectional drawing of the electroacoustic transducer in 3rd Embodiment of this invention. It is a
top view of the electroacoustic transducer in 3rd Embodiment of this invention. It is a perspective
view of the voice coil in the electroacoustic transducer shown to FIG. 7, FIG. It is sectional
drawing of the electroacoustic transducer in 4th Embodiment of this invention. It is a top view of
the electroacoustic transducer in 4th Embodiment of this invention. It is a front view of the
mobile telephone provided with the electroacoustic transducer in a prior art. It is a perspective
view of the voice coil which comprises the electroacoustic transducer of FIG.
Explanation of sign
[0033]
1, 1a, 1b Permanent magnet 2 Yoke 3, 3a, 3b Top plate 4, 14, 24, 34 Voice coil 5, 25, 35, 45
Reinforcement member 6 Vibrating film 7 Frame 8 Protector 10, 20, 30, 40 Conductivity type
Speaker 21, 31, 41 Slit
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