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JPH0573698

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DESCRIPTION JPH0573698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small-sized electroacoustic device for use in a small radio such as a portable telephone or a
pager.
[0002]
2. Description of the Related Art FIGS. 4 and 5 show a conventional example of an
electromagnetic electroacoustic transducer incorporated in a small radio such as a pager. As
shown in the figure, this electroacoustic device is provided with a sound generator unit in the
lower case 1, and the sound generator unit is integrally formed with a disc-shaped yoke 2 made
of a magnetic material. And a coil 4 provided around the pole piece 3, a ring-shaped magnet 5,
and a disc-shaped diaphragm 6. The diaphragm 6 is mounted on a part of the lower case 1 and,
at the center of the diaphragm 6, a weight plate 6a for providing stable vibration is provided.
Further, a terminal board 8 having a connection terminal 7 is fixed to the lower case 1 and
further, a middle partition plate 10 having a sound hole 10a is provided in the upper case 9
having a sound hole 9a. A front air chamber 11 and a resonance chamber 12 are formed.
[0003]
In this electric acoustic device, the vibration noise of the diaphragm 6 resonates in the front air
chamber 11 first, passes through the sound hole 10a, enters the resonance chamber 12,
resonates again in the resonance chamber 12, and the sound hole It is discharged outward from
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9a.
[0004]
In recent years, the miniaturization of cellular phones, pagers, etc. has rapidly progressed, and it
has become necessary to further miniaturize the electroacoustic instrument to be incorporated
into these miniature radios. The above-described conventional electric acoustic device causes the
vibration sound of the diaphragm 6 to resonate in the front air chamber 11, and then causes the
resonance chamber 12 to resonate again, and then discharges it from the resonance chamber 12
to the outside. The height dimension (thickness dimension) of the resonance chamber 12 must be
increased to a certain extent, which makes the form of the electroacoustic device larger and
makes it difficult to be incorporated into a small wireless device which is miniaturized year by
year. There is.
[0005]
In view of the above-described situation, the present invention can shorten the height dimension
and flatten as much as possible to facilitate incorporation into equipment, and can secure the
necessary sound pressure in a small flat form. The purpose is to develop this type of
electromagnetic electroacoustic device.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, the upper case and the lower case both of which are open at one side for sound holes
are flat. A partition plate is provided in the acoustic case so as to form an acoustic case and to be
parallel to the diaphragm of the sound producing unit provided in the lower case, and this
partition plate is the upper case A resonance chamber is formed between them and a first sound
hole communicating with the resonance chamber with one side portion of the upper case
respectively, and further, this partition plate connects the front air chamber with the diaphragm.
A second sound hole communicating with the front air chamber is formed on one side of the
lower case, and the above-mentioned resonance chamber and the front air chamber are
communicated by the communication hole provided in the partition plate. We propose an
electromagnetic electroacoustic device characterized by
[0007]
In the electromagnetic electroacoustic apparatus described above, the vibration noise of the
diaphragm resonates in the front air chamber, and then is split in two directions and emitted
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outside the chamber.
That is, after resonating in the front air chamber, it enters the resonance chamber through the
communication hole of the partition plate, and after resonating again in this resonance chamber,
vibration noise emitted to the outside from the first sound hole and the front air After resonating
in the chamber, it is divided into vibration noise emitted to the outside from the second sound
hole.
These vibration noises intersect at the outside of the first and second sound holes, and the phase
difference between the vibration noises results in a larger sound pressure.
[0008]
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of an electromagnetic electroacoustic apparatus according to the present
invention, FIG. 2 is a longitudinal sectional side view of the same acoustic apparatus, and FIG. 3 is
a side view of the same acoustic apparatus as viewed from the sound hole side.
[0009]
In this electromagnetic type electroacoustic device, the upper case 20 and the lower case 21
form a flat-type acoustic device case, and the upper case 20 and the lower case become flat
portions. Each side portion of the sleeve 21 is an opening 20a, 21a as shown in FIG.
[0010]
The lower case 21 is formed with a ring-shaped convex portion 22 and a ring-shaped flange 23
slightly higher than the convex portion 22, and the upper edge of the convex portion 22 is
circular. The diaphragm 24 is mounted.
24a is a weight for achieving stable vibration of the diaphragm 24
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[0011]
Inside the convex portion 22, a yoke 27 provided with a pole material 25 made of a magnetic
material, a coil 27 provided around the periphery of the pole material 25, and the coil 27 outside
the coil 27 are provided. The ring-shaped magnet 28 provided is accommodated.
The members 25, 26, 27, 28 and the diaphragm 24 constitute a sound producing unit.
[0012]
In the space on the side of the lower case 21, the lower case 21 is integrally erected from the
lower case 21 so as to partially close the open portion 21a of the lower case 21. A plate portion
29 is provided.
[0013]
Further, on the front side of the diaphragm 24, a partition plate 30 fixed so as to be placed on
the flange 23 and the standing plate portion 29 is provided, and this partition plate 30 forms a
thin plate on the front side of the diaphragm 24. The front air chamber 31 is formed, and further,
the resonance plate 32 is formed by the partition plate 30 and the upper case 20.
Further, on the side of the front air chamber 31, a resonance chamber 33 is formed by the flange
23, the rising plate portion 29, and the partition plate 30.
[0014]
Further, a communicating hole 30a is formed in the partition plate 30, and the front air chamber
31 and the resonance chamber 32 are communicated with each other. A rectangular through
hole 23 a communicating the front air chamber 31 with the resonance chamber 33 is formed in
the flange 23 which is the side wall of the front air chamber 31, and the standing plate portion
29 which is one side wall of the resonance chamber 33. A rectangular hole 29a is formed so that
the front air chamber 31 communicates with the outside of the lower case 21 through the open
space 21a of the lower case 21 through the resonance chamber 33.
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[0015]
The through hole 23a and the square hole 29a are formed to be located substantially at the
center of the open portion 21a formed in the lower case 21. That is, the square hole 29 a is a
second sound hole communicating with the front air chamber 31. On the other hand, the open
portion 20 a of the upper case 20 forms a first sound hole with the partition plate 30, and the
first sound hole communicates with the resonance chamber 32. In addition, reference numeral
34 in the figure is a mounting portion of a feeding terminal for feeding the coil 27.
[0016]
In the electromagnetic electroacoustic apparatus described above, the coil 27 is supplied with
power by a receiver circuit (not shown), and the diaphragm 24 vibrates to generate vibration
noise.
[0017]
The vibration noise resonates in the front air chamber 31 first, and is separated from the front
air chamber 31 in two directions and emitted outside the chamber.
The vibration noise emitted to the outside from the first direction enters the resonance chamber
32 from the sound hole 30 a of the partition plate 30 and resonates again in the resonance
chamber 32, and is provided to the open portion 20 a of the upper case 20. It is emitted to the
outside through the first sound hole.
[0018]
The vibration sound emitted to the outside from the second direction enters the resonance
chamber 33 from the through hole 23a provided in the flange 23 and resonates again in the
resonance chamber 33, and then the second sound hole is produced. It is discharged to the
outside through the open part 21a of the lower case 21 from 29a.
[0019]
The vibration noise emitted to the outside from the first direction and the vibration noise
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released to the outside from the second direction intersect at the outside of the first and second
sound holes, and each vibration noise The sound pressure becomes even larger due to the phase
difference of
[0020]
In the above embodiment, the resonance chamber 33 is provided on the side of the front air
chamber 31. However, the resonance chamber 33 is not necessarily required, and the vibration
noise is generated by the upper case 20 and the lower case. The same effect can be obtained by
configuring to intersect at the outside of the open portions 20a and 21a of the sheath 21.
[0021]
As described above, according to the electromagnetic type electroacoustic device according to
the present invention, the vibration sound of the diaphragm is resonated in the front air chamber,
and is divided into two directions from the front air chamber, 2 The vibration sound in the
direction is made to cross on the outside of the acoustic case, and a large sound pressure is
obtained by the phase difference of each vibration sound, so the height dimension can be
shortened and it is necessary even if flattened as possible. It becomes a small-sized
electromagnetic electroacoustic device that can secure sufficient sound pressure.
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