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JP2004266410

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DESCRIPTION JP2004266410
In an electro-acoustic transducer device, even when the electro-acoustic transducer is shared by
a speaker and a receiver, it is possible to secure a required sound pressure at the time of use as a
loudspeaker after securing sufficient sound quality. . An internal space of a housing for housing
an electroacoustic transducer is divided into a front space Cf and a rear space Cr with a
diaphragm as a boundary, and a rear space Cr is formed into a rear sound emission hole b. It
divides into 1st space Cr1 which faces and 2nd space Cr2 other than that. The sound emitted
from the front sound emission hole 14Ab is used as the sound of the speaker, and the sound
emitted from the rear sound emission hole 14Bb is used as the sound of the receiver. At that
time, the volumes of the front side space Cf and the first space Cr1 are reduced, and the
resonance effect ensures sufficient sound quality as a speaker and a receiver. On the other hand,
the volume of the second space Cr2 is made sufficiently large, and even if the amplitude of the
diaphragm 22 becomes large, the back pressure is sufficiently absorbed to secure the required
sound pressure. [Selected figure] Figure 1
Electro-acoustic transducer device
TECHNICAL FIELD [0001] The present invention relates to an electroacoustic transducer device
in which an electroacoustic transducer is accommodated in a housing. 2. Description of the
Related Art In general, portable communication devices such as portable telephones are provided
with an electroacoustic transducer such as a receiver for telephone calls and a speaker for
alerting incoming calls. At that time, Patent Document 1 describes an electroacoustic transducer
device in which a casing of a portable communication device is used as a housing for housing the
electroacoustic transducer. In the electro-acoustic transducer device described in Patent
Document 1, the inner space of the casing is divided into a front side space and a rear side space
with the diaphragm of the electro-acoustic transducer as a boundary, and the casing is In the
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front wall and the rear wall of the case, a front sound emission hole and a rear sound emission
hole are formed, which communicate the front space and the rear space with the outer space of
the casing. And by adopting such a configuration, it is possible to radiate the sound generated by
the electroacoustic transducer in both the front and back directions of the casing. Patent
Document 1: Japanese Patent Application Publication No. 2001-230841 SUMMARY OF THE
INVENTION The electro-acoustic transducer device described in Patent Document 1 is configured
to have a function as a speaker. However, it is also possible to add a function as a receiver to this.
That is, if the sound emitted from the front sound emission hole is used as the sound of the
speaker while the sound emitted from the rear sound emission hole is used as the sound of the
receiver, one electroacoustic transducer is used as the speaker and the receiver It can be shared
by At that time, in order to secure sufficient sound quality by the resonance effect of the housing,
it is preferable to make the front side space smaller as a speaker to some extent, and it is
preferable to make the rear side space smaller as a receiver to some extent. However, when the
front side space and the rear side space are reduced as described above, the following problems
occur. That is, when the electroacoustic transducer is used as a receiver, since the user places an
ear on the rear wall of the casing of the portable communication device to make a call, the power
of the input signal should be small. Can. And in this case, the amplitude of the diaphragm can be
suppressed to a small value, so that no particular problem occurs. On the other hand, when the
electroacoustic transducer is used as a speaker, since the ringing tone and the like are heard at a
position distant from the portable communication device, it is necessary to make the power of
the input signal considerably large.
And in this case, since the amplitude of the diaphragm also becomes considerably large, if the
space on the rear side is small, the back pressure can not be sufficiently absorbed, and hence the
required sound pressure can not be secured. There is a problem of The present invention has
been made in view of such circumstances, and in an electro-acoustic transducer device in which
an electro-acoustic transducer is accommodated in a housing, the electro-acoustic transducer
includes a speaker and a receiver. It is an object of the present invention to provide an electroacoustic transducer device capable of securing a required sound pressure at the time of use as a
speaker while securing sufficient sound quality even in the case where . SUMMARY OF THE
INVENTION The present invention achieves the above object by devising the configuration of the
rear side space. That is, in the electro-acoustic transducer device according to the present
invention, in the electro-acoustic transducer device in which the electro-acoustic transducer is
accommodated in a housing, the internal space of the housing is a diaphragm of the electroacoustic transducer. The housing is divided into a front side space and a rear side space, and a
front sound emission hole is formed in the front wall of the housing for connecting the front side
space to the external space of the housing. A rear sound emission hole for communicating the
rear side space with the external space of the housing is formed in the rear wall of the housing,
and the volume of the rear side space is set to a value larger than the volume of the front side
space The rear side space is substantially divided into a first space facing the rear sound release
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hole and a second space other than the first space. The drive type of the “electroacoustic
transducer” is not particularly limited, and, for example, an electrodynamic electroacoustic
transducer or an electromagnetic electroacoustic transducer may be employed. The abovementioned “internal space of the housing” does not mean only the space located outside the
electroacoustic transducer in the housing, but also includes the space located inside the
electroacoustic transducer. Mean the space that Although the specific value of the “volume of
the rear side space” is not particularly limited as long as it is set to a value larger than the
volume of the front side space, it occurs when used as a speaker From the viewpoint of
sufficiently absorbing the back pressure, it is preferable to set the value as large as possible
within the structurally acceptable range. The term “substantially partitioned” means that
substantially only the first space is partitioned to participate in the resonance effect when used
as a receiver.
As described above, the electro-acoustic transducer device according to the present invention is
configured such that the electro-acoustic transducer is accommodated in the housing, but the
internal space of the housing is It is divided into the front side space and the rear side space
bordering on the diaphragm of the electroacoustic transducer, and the front wall of the housing
has a front sound emission hole which makes the front side space communicate with the external
space of the housing. In addition to being formed, the rear wall of the housing is formed with a
rear sound release hole for communicating the rear space with the outer space of the housing,
and the volume of the rear space is larger than the volume of the front space. Since the rear side
space is substantially divided into a first space facing the rear sound emission hole and a second
space other than the first space, the sound emitted from the front sound emission hole is set. The
sound of the speaker While to use, it can be a sound emitted from the rear sound output hole for
use as a sound receiver, obtaining the following effects. That is, if the volume of the front side
space is reduced to a certain extent, sound quality sufficient as a speaker can be secured by the
resonance effect of the front side space. Even in this case, since the volume of the rear side space
is set to a value larger than the volume of the front side space, it becomes possible to sufficiently
absorb the back pressure even if the amplitude of the diaphragm becomes large, Thereby, the
required sound pressure as a speaker can be ensured. On the other hand, if the volume of the
first space facing the rear sound emission hole in the rear side space is reduced to a certain
extent, sound quality sufficient as a receiver can be secured by the resonance effect of the first
space. In addition, when using as a receiver, since the amplitude of a diaphragm is small, even if
the volume of front side space is small, a problem in particular does not arise. As described
above, according to the present invention, in the electro-acoustic transducer device in which the
electro-acoustic transducer is accommodated in the housing, even when the electro-acoustic
transducer is shared by the speaker and the receiver, The required sound pressure can be
secured at the time of use as a speaker after securing sufficient sound quality. In the above
configuration, the specific sizes of the first and second spaces constituting the rear side space are
not particularly limited, but the volume of the second space is larger than the volume of the first
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space If the receiver is set as a receiver, the volume of the first space is reduced to some extent to
enhance the sound quality of the receiver by its resonance effect, and a sufficient back pressure
absorption space is used when used as a speaker. It can be secured.
Further, in the above configuration, if the first space and the second space are completely
separated on the outside of the electroacoustic transducer, and are communicated with each
other on the inside of the electroacoustic transducer, the rear sound emission hole Since the
shape of the first space can be determined in the vicinity, it is possible to easily calculate the
resonance effect of the first space. Alternatively, instead of doing this, the first space and the
second space may be communicated with each other via a predetermined communication hole
outside the electroacoustic transducer, and the first space may be exposed to the diaphragm. By
forming it, it is not necessary to connect the first space and the second space to each other inside
the electro-acoustic transducer, so that the number of sound emission holes to be formed in the
electro-acoustic transducer can be reduced. The configuration of the electroacoustic transducer
can be simplified. In this case, the above-mentioned "predetermined communication hole" is a
specific configuration such as size, shape, number, arrangement, etc. within the range not
substantially affecting the resonance effect at the time of use as a receiver. Is not particularly
limited. Incidentally, although the electro-acoustic transducer device according to the present
invention may be incorporated as a unit into a portable communication device, the housing of the
electro-acoustic transducer device is a casing of the portable communication device. If it is
configured as a part, the configuration of the portable communication device can be simplified,
and the casing can be made compact. In this case, the type of “portable communication device”
is not particularly limited as long as it is a portable communication device, and a portable
telephone, a PHS telephone, a PDA, a slave of a fixed telephone, etc. can be adopted. It is. BEST
MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention
will be described with reference to the drawings. FIG. 1 is a side sectional view showing an
electroacoustic transducer device 10 according to an embodiment of the present invention in a
state of being disposed upward, and FIGS. 2 and 3 are a plan view and a bottom view thereof. . As
shown in these figures, the electro-acoustic transducer device 10 according to the present
embodiment includes the electro-acoustic transducer 12 housed in a housing 14 and is used in a
state of being incorporated in a portable telephone etc. It has become so. The electroacoustic
transducer 12 is an electrodynamic electroacoustic transducer having an outer diameter of about
10 to 20 mm, and the diaphragm 22, a frame 24 for supporting the outer peripheral edge of the
diaphragm 22, and a front end Comprises a voice coil 26 fixed to the diaphragm 22, a magnetic
circuit unit 28 in which a cylindrical magnetic gap for accommodating the rear end of the voice
coil 26 is formed, and a cover 30 covering the diaphragm 22 from the front side It has become.
FIG. 4 is a detailed view of the main part of FIG. As also shown in this figure, the frame 24 is
formed in a ring shape, and an upward annular flange portion 24 a is formed at the outer
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peripheral end thereof. A diaphragm support portion 24b for supporting the diaphragm 22 is
formed on the inner peripheral side of the annular flange portion 24a in the frame 24. A plurality
of diaphragm support portions 24b are provided on the inner peripheral side of the diaphragm
support portion 24b in the circumferential direction. The sound release hole 24c is formed.
Furthermore, an annular flange portion 24 d that protrudes rearward is formed at the inner
peripheral end of the frame 24. The magnetic circuit unit 28 comprises a base 32 made of steel,
a magnet 34 and a yoke 36 made of steel, and is fixed to the inner peripheral end of the frame
24 at the outer peripheral part of the base 32. In the base 32 of the magnetic circuit unit 28, a
plurality of sound emission holes 32a are formed at a plurality of circumferential locations. The
cover 30 is fixed to the diaphragm support 24 b of the frame 24 at its outer peripheral end. A
plurality of sound emission holes 30 a are formed in the center of the cover 30 and the periphery
thereof. The housing 14 is formed by joining a front housing 14A and a rear housing 14B. Three
oval front sound release holes 14Ab are formed in the center of the front wall 14Aa of the front
housing 14A. An annular flange portion 14Ac is formed on the inner surface of the front wall
14Aa so as to surround the three front sound emission holes 14Ab. The annular flange portion
14Ac has an inner diameter slightly larger than the outer diameter of the frame 24 of the
electroacoustic transducer 12. On the other hand, in the center of the rear wall 14Ba of the rear
housing 14B, two slightly short oval rear sound emission holes 14Bb are formed. An annular
flange portion 14Bc is formed on the inner surface of the rear surface wall 14Ba so as to
surround the two rear sound output holes 14Bb. The annular flange portion 14Bc has an inner
diameter slightly larger than the annular flange portion 24d of the frame 24 of the
electroacoustic transducer 12. The electroacoustic transducer 12 is accommodated in the
housing 14 so as to be positioned on the inner peripheral side of the annular flange portion 14Ac
of the front housing 14A. At this time, a gasket 38 is interposed along the inner peripheral
surface of the annular flange portion 14Ac, between the annular flange portion 24a of the frame
24 and the front housing 14A. The internal space of the housing 14 is divided into a front side
space Cf and a rear side space Cr with the diaphragm 22 as a boundary.
A gasket 40 is interposed along the inner peripheral surface of the annular flange portion 14Bc
between the annular flange portion 24d of the frame 24 and the rear housing 14B, whereby the
rear side is provided. The space Cr is divided outside the electroacoustic transducer 12 into a
first space Cr1 facing the rear sound emission hole 14Bb and a second space Cr2 other than the
first space Cr1. From the viewpoint of sufficiently absorbing the back pressure generated during
use as a speaker as described later, it is preferable to set the volume of the rear side space Cr as
large as possible. Specifically, the volume of the rear space Cr is preferably set to 10 or more
times the volume of the front space Cf, and more preferably 20 or more times the volume of the
front space Cf Preferably, the value is set to be 30 times or more of the volume of the front side
space Cf. At that time, from the viewpoint of securing sufficient sound quality at the time of use
as a receiver, the volume of the first space Cr1 facing the rear sound release hole 14Bb in the
rear side space Cr is set to a small value to some extent, and the appropriate resonance effect is
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obtained. It is preferable to set the volume of the second space Cr2 to a value as large as possible
because it is preferable to obtain the same. From this point of view, in the present embodiment,
the volume of the front space Cf is about 0.1 cc, the volume of the first space Cr1 of the rear
space Cr is about 0.1 cc, and The volume of the two space Cr2 is set to about 4 cc. Next, the
operation and effect of the present embodiment will be described. In the electro-acoustic
transducer device 10 according to the present embodiment, the electro-acoustic transducer 12 is
shared by a speaker and a receiver. That is, while the sound emitted from the front sound
emission hole 14Ab is used as a speaker sound for notification of arrival, the sound emitted from
the rear sound emission hole 14Bb is used as a sound of a receiver for communication. There is.
At that time, the power of the input signal as the sound of the speaker is about 0.3 W and
relatively large, so the diaphragm 22 vibrates largely. On the other hand, since the power of the
input signal as the sound of the receiver is about 1 mW and relatively small, the diaphragm 22
vibrates small. In the electro-acoustic transducer device 10 according to the present embodiment,
when the diaphragm 22 vibrates largely, as indicated by an arrow A in FIG. 4, the front side
space Cf from the front side space Cf via the front sound emission hole 14Ab Sound is emitted
toward the
At this time, as indicated by the arrow B in the same figure, the sound is emitted from the first
space Cr1 of the rear side space Cr to the rear through the rear sound emission hole 14Bb, but
the three front sound emission Since the total opening area of the holes 14Ab is considerably
larger than the total opening area of the two rear sound emission holes 14Bb, sound is emitted
mainly forward. At this time, since the front side space Cf is set to a small volume of about 0.1 cc,
sufficient sound quality as a speaker can be secured by the resonance effect of the front side
space Cf. At this time, since the second space Cr2 of the rear side space Cr is set to a large
volume of about 4 cc, as shown by the arrow C in FIG. It can be absorbed, and this can ensure the
required sound pressure as a speaker. On the other hand, even when the diaphragm 22 vibrates
small, as indicated by the arrow A, a sound is emitted forward from the front side space Cf via the
front sound emission hole 14Ab, and the arrow B As shown in, the sound is emitted rearward
from the first space Cr1 of the rear side space Cr via the rear sound emission hole 14Bb, and at
this time, the sound is emitted mainly forward. However, when used as a receiver, since the user
places an ear on the rear wall 14Ba of the housing 14 to make a call, the user can hear the sound
from the rear sound emission hole 14Bb. At this time, since the first space Cr1 is set to a small
volume of about 0.1 cc, it is possible to ensure sufficient sound quality as a receiver by the
resonance effect of the first space Cr1. In addition, when using as a receiver, since the amplitude
of the diaphragm 22 is small, even if the front side space Cf is set to a small volume of about 0.1
cc, no particular problem occurs. As described above, according to the present embodiment, even
when the electroacoustic transducer 12 is shared by the speaker and the receiver, a sufficient
sound quality is ensured, and then the required sound when used as the speaker The pressure
can be secured. In particular, in the present embodiment, since the volume of the first space Cr1
and the volume of the front space Cf are set to substantially the same small value, the sound
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quality of both the speaker and the receiver can be sufficiently improved. . In the present
embodiment, the first space Cr 1 and the second space Cr 2 are completely separated on the
outside of the electroacoustic transducer 12, and the sound emission hole 24 c of the frame 24
and the sound emission of the base 32 are emitted. Since the interiors of the electroacoustic
transducer 12 communicate with each other through the holes 32a, the shape of the first space
Cr1 in the vicinity of the rear sound output hole 14Bb can be determined.
Then, since it becomes possible to easily calculate the resonance effect of the first space Cr1, it is
possible to improve the sound quality of the receiver in which the sound quality is particularly
emphasized. FIG. 5 is a view similar to FIG. 4 showing a modification of the above embodiment.
As shown in this figure, also in this modification, the basic configuration is the same as that of
the above embodiment, but in this modification, the sound release hole 24 c is not formed at all
in the frame 24. The present embodiment is different from the above embodiment in that the
annular flange portion 24d is notched at a plurality of circumferential positions to form a
plurality of communication holes 24e. Thus, in the present modification, the first space Cr1 and
the second space Cr2 communicate with each other through the plurality of communication
holes 24e outside the electroacoustic transducer 12, and the first space Cr1 Are formed to face
the diaphragm 22. By adopting the configuration of the present modification, it is not necessary
to connect the first space Cr 1 and the second space Cr 2 to each other inside the electroacoustic
transducer 12, so that the electroacoustic transducer 12 is formed. The sound emission holes to
be formed can be only the sound emission holes 32 a of the base 32, whereby the configuration
of the electroacoustic transducer 12 can be simplified. In the above embodiment, the first space
Cr1 and the second space Cr2 are completely separated on the outside of the electroacoustic
transducer 12, but both are in communication with each other. It is also possible. That is, in
addition to the sound output holes 24 c of the frame 24 and the sound output holes 32 a of the
base 32, it is possible to form a communication hole 24 e in the annular flange portion 24 d as in
the above modification. When such a configuration is adopted, it is possible to adjust the acoustic
effect by appropriately changing the size, shape, number, arrangement, and the like of the
communication holes 24 e. Incidentally, although the electro-acoustic transducer device 10 has
been described as being incorporated as a unit into a cellular phone or the like in the above
embodiment and the modification thereof, as shown in FIG. 6, the electro-acoustic transducer
device 10 is The housing 14 can also be configured as part of a casing 50 such as a mobile
phone. By adopting such a configuration, the configuration of the mobile phone and the like can
be simplified, and the casing 50 can be made compact. BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side cross-sectional view showing an electro-acoustic transducer device according to
an embodiment of the present invention disposed upward, and FIG. 2 shows the electro-acoustic
transducer device disposed upward. FIG. 3 is a plan view of the electroacoustic transducer
according to the embodiment of the present invention, and FIG. 4 is a detailed view of the
essential parts of FIG. [FIG. 6] Diagram similar to 4 [FIG. 6] Diagram similar to FIG. 1 showing
another modification of the above embodiment [Description of reference numerals] 10
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electroacoustic transducer device 12 electroacoustic transducer 14 housing 14A front housing
14Aa front surface Wall 14Ab Front sound emission hole 14Ac Annular flange portion 14B Rear
housing 14Ba Rear wall 14Bb Rear sound emission hole 14Bc Annular flange portion 22
Diaphragm 24 Frame 24a, 24d Annular flange portion 24b Diaphragm support 24c Sound
emission hole 24e Communication hole 26 Voice coil 28 Magnetic circuit unit 30 Cover 30a
Sound emission hole 32 Base 32a Sound emission hole 34 Magnet 36 Yoke 38, 40 Gasket 50
Casing Cf Front side space Cr Back side space Cr1 1st Space Cr2 second space
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