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DESCRIPTION JP2008312056

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DESCRIPTION JP2008312056
A thin electro-acoustic transducer excellent in acoustic characteristics is provided. A magnetic
circuit including a magnet, a top plate sandwiching the magnet, and a yoke, a voice coil disposed
in a magnetic gap of the magnetic circuit, and a portion of the voice coil joined to the voice coil
In the electro-acoustic transducer provided with a diaphragm driven by the magnetic circuit, the
magnetic circuit includes a first magnet 11a disposed at the center, and at least one magnet
disposed at a predetermined distance around the first magnet 11a. That each of the thickness
values e and f of the first and second magnets 11 a and 11 b is set to a smaller value than the
value of the magnetic gap 15. It features. [Selected figure] Figure 1
Electro-acoustic transducer
[0001]
The present invention relates to an electro-acoustic transducer used for audio equipment and
information communication equipment, and more particularly to an electro-acoustic transducer
such as a thin speaker or receiver.
[0002]
2. Description of the Related Art In recent years, a small-sized, thin, and high-performance
electrodynamic speaker has been widely used as an electroacoustic transducer of a mobile
communication device such as a mobile phone (see, for example, Patent Document 1).
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An example of such a conventional speaker will be described based on FIG. FIG. 8 shows a
conventional speaker. FIG. 8 (a) is a cross-sectional view, and FIG. 8 (b) is a cross-sectional view
showing a magnetic circuit which is a main part of the speaker shown in FIG. 8 (a).
[0003]
As shown in FIG. 8, the conventional speaker includes a magnet 1 magnetized, a top plate 2 and a
yoke 3 for holding the magnet 1, a frame 6 adhesively bonded to the yoke 3, and a peripheral
portion of the frame 6. A diaphragm 7 adhesively bonded and a voice coil 8 adhesively bonded to
a part of the diaphragm 7 are provided. The magnet 1, the top plate 2 and the yoke 3 constitute a
magnetic circuit 4 passing through the magnetic gap 5, and the voice coil 8 is inserted and
disposed in the magnetic gap 5 of the magnetic circuit 4. When an audio signal is input to the
voice coil 8 of this speaker, the diaphragm 7 vibrates to generate a sound.
[0004]
JP 2004-356833 A (Page 2, FIG. 4)
[0005]
As described above, the configuration of the speaker magnetic circuit 4 in the prior art has a
structure in which the magnet 1 is laminated on the upper surface of the yoke 3 and the top
plate 2 is laminated on the upper surface of the magnet 1. It is necessary to reduce the
component thickness value.
However, when the value of thickness t of magnet 1 is set smaller than the value a of magnetic
gap 5 of magnetic circuit 4, a magnetic path is formed in which magnetic flux ma flows directly
to magnet end face 1 a and magnetic flux flows in magnetic gap 5 The mb decreased and it was
difficult to maintain the magnetic properties. For this reason, there existed a problem that
thickness reduction of an electroacoustic transducer was difficult.
[0006]
(Purpose) The present invention has been made in view of the above problems, and magnetic
characteristics can be maintained even if the value of magnet thickness t is set to a value smaller
than the value of magnetic gap a, and thin acoustic characteristics can be obtained. It is an object
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of the present invention to provide an excellent electroacoustic transducer.
[0007]
In order to solve the above problems, an electroacoustic transducer according to the present
invention comprises a magnetic circuit including a magnet and a top plate and a yoke
sandwiching the magnet, a voice coil disposed in a magnetic gap of the magnetic circuit, and the
voice coil. In an electro-acoustic transducer comprising a diaphragm, a part of which is joined
and driven by the voice coil, a magnetic circuit comprises a first magnet arranged in the center
and a circumference of the first magnet. And at least one second magnet disposed at an interval
between the first and second magnets, wherein the thickness value of each of the first and
second magnets is set to be smaller than the value of the magnetic gap It is characterized by
[0008]
In addition, a magnetic circuit including a magnet and a top plate sandwiching the magnet and a
yoke, a voice coil disposed in the magnetic gap of the magnetic circuit, and a portion thereof
bonded to the voice coil and driven by the voice coil In the electro-acoustic transducer including
the vibration plate, the magnetic circuit includes a first magnet disposed at the center, and at
least one second magnet disposed at a predetermined distance around the first magnet. Magnets
and first and second top plates provided at positions corresponding to the first and second
magnets, the first and second magnets being made of magnets of different materials, and the
respective thicknesses The first and second top plates are characterized in that the thickness of
the first and second top plates are set to different values from each other.
[0009]
Also, the magnetic circuit is characterized in that it has a circular shape, the first magnet has a
circular shape or a cylindrical shape, and the second magnet has a cylindrical shape.
[0010]
In addition, a magnetic circuit including a magnet and a top plate sandwiching the magnet and a
yoke, a voice coil disposed in the magnetic gap of the magnetic circuit, and a portion thereof
bonded to the voice coil and driven by the voice coil In the electro-acoustic transducer including
the vibrating plate, the magnetic circuit includes a first magnet disposed at the center, and at
least a pair of magnets disposed opposite to a part of the periphery of the first magnet at a
predetermined interval. A second magnet comprising a magnet is provided, and the thickness
value of each of the first and second magnets is set to be smaller than the value of the magnetic
gap.
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[0011]
In addition, first and second top plates are provided at positions corresponding to the first and
second magnets, respectively, and the first and second magnets have respective thicknesses
compared with the value of the magnetic gap. The first and second top plates are set to different
values, and the first and second top plates are set to different values.
[0012]
Also, the magnetic circuit has an oval shape or a rectangular shape, the first magnet is hollow or
solid in an oval shape or a rectangular shape, and the second magnet is disposed in the lateral
direction of the first magnet. And extending along a longitudinal direction of the first magnet.
[0013]
According to the present invention, the magnetic flux density in the magnetic gap is improved,
and a thin electroacoustic transducer excellent in acoustic characteristics can be provided.
When mounted on a rectangular device such as a cellular phone, the volume of the magnetic
circuit can be increased by making the shape of the magnetic circuit into an oval or rectangular
shape, and the sound pressure of the speaker is improved. And a thin electro-acoustic transducer
excellent in acoustic characteristics.
[0014]
Further, by using magnets of different materials from the central magnet and the hollow magnet,
it is possible to suppress an increase in cost even when using a plurality of magnets.
[0015]
The speaker as the electroacoustic transducer in this embodiment is characterized by a magnetic
circuit including a top plate sandwiching a magnet and a yoke.
The magnetic circuit comprises a first magnet disposed at the center and at least one second
magnet disposed at a predetermined distance around the first magnet. By setting the value of
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each thickness of the magnet to a smaller value than the value of the magnetic gap, the magnetic
flux density in the magnetic gap is improved to provide a thin speaker excellent in acoustic
characteristics.
[0016]
1 and 2 show a speaker according to the first embodiment of the present invention, FIG. 3 shows
another example of the speaker according to the first embodiment, and FIGS. 4 and 5 show a
speaker according to the second embodiment. 6 and 7 show a speaker according to the third
embodiment.
In each embodiment, a magnetic circuit which is a main part of the speaker will be described, and
the description of the same components as those of the prior art will be omitted.
Hereinafter, specific examples of the speaker of the present invention will be described based on
FIGS. 1 to 7.
[0017]
FIG. 1 shows a magnetic circuit which is a main part of a speaker in Example 1 of the present
invention, FIG. 1 (a) is a plan view, and FIG. 1 (b) is a cross-sectional view taken along line AA in
FIG. .
FIG. 2 is a partially enlarged cross-sectional view in which a portion of FIG. 1 (b) is enlarged.
In the present embodiment, a circular magnetic circuit will be described as an example.
As shown in FIGS. 1 and 2, the magnetic circuit of the speaker in this embodiment includes a
disk-shaped yoke 13 having an opening at the center and a cylindrical first magnet 11a disposed
at the center on the yoke 13. A cylindrical second magnet 11b disposed at a predetermined
distance around the first magnet 11a, a first top plate 12a disposed on the upper surface of the
first magnet 11a, and a second And a second top plate 12b disposed on the top surface of the
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magnet 11b.
As described above, the magnetic circuit in this embodiment is configured to hold the first and
second magnets 11a and 11b between the yoke 13 and the first and second top plates 12a and
12b.
[0018]
The first magnet 11a has its central axis aligned with the central axis of the magnetic circuit and
is disposed on the yoke 13. For example, one surface side is magnetized to an N magnetic pole
and the other surface side is magnetized to an S magnetic pole. The first top plate 12a disposed
on the side facing the yoke 13 of the first magnet 11a is a magnetic body having a cylindrical
shape with an outer diameter larger than the outer diameter of the first magnet 11a.
[0019]
The second magnet 11b is disposed on the yoke 13 concentrically with the first magnet 11a, and
for example, magnetizes one surface side to an S magnetic pole and the other surface side to an
N magnetic pole. At this time, the first magnet 11a and the second magnet 11b are magnetized
such that the opposing sides have opposite magnetic poles. The second top plate 12b disposed
on the side facing the yoke 13 of the second magnet 11b is a magnetic body having a cylindrical
shape with an inner diameter smaller than the inner diameter of the second magnet 11b.
[0020]
The thickness f of the second magnet 11 b is set to a larger value than the thickness e of the first
magnet 11 a. The thickness d of the second top plate 12b is set to a smaller value than the
thickness c of the first top plate 12a. In the state where the first and second top plates 12a and
12b are stacked on the first and second magnets 11a and 11b, respectively, the dimensions of
each portion are set such that the upper surfaces thereof are substantially the same plane. It is
done.
[0021]
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Further, a magnetic gap 15 having a gap of a distance b is formed between the outer periphery
of the first top plate 12 a and the inner periphery of the second top plate 12 b. In addition, the
thicknesses e and f of the first and second magnets 11 a and 11 b are set to be smaller than the
distance b of the magnetic gap 15. Thus, by arranging the second magnet 11b at a
predetermined interval around the first magnet 11a, the magnetic gap 15 can be moved from the
first top plate 12a to the second top plate 12b. A magnetic field having a high magnetic flux
density m acts, and the magnetic flux density m acting on the air gap of the magnetic gap 15 is
improved.
[0022]
Also, magnets of different materials can be used for the first magnet 11a and the second magnet
11b. In the present embodiment, the first magnet 11a is neodymium, and the second magnet 11b
is neodybond. Thus, cost can be reduced by using magnets of different materials.
[0023]
Furthermore, by setting the thickness c of the first top plate 12a to a value larger than the
thickness d of the second top plate 12b, the magnetic flux outlet is larger, the magnetic flux inlet
is smaller, and the magnetic flux is more concentrated. The magnetic flux density m acting on the
air gap of the magnetic gap 15 is further improved. In the present embodiment, the gap size b of
the magnetic gap 15 is 0.55 mm, the thickness e of the first magnet 11 a is 0.4 mm, and the
thickness f of the second magnet 11 b is 0.5 mm, the first The thickness c of the top plate 12a is
0.3 mm, the thickness d of the second top plate 12 b is 0.2 mm, and it is confirmed that the
magnetic flux density m is improved. However, these numerical values are not limited and can be
set as appropriate. Although it has been experimentally confirmed that the magnetic flux density
m is improved even if the thicknesses c and d of the first and second top plates 12a and 12b
have the same value, the first and second top plates 12a and 12b have the same value. Setting
the thicknesses c and d of the top plates 12a and 12b to different values is preferable because
the magnetic flux is more concentrated and the magnetic flux density m acting on the air gap of
the magnetic gap 15 is further improved.
[0024]
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In the magnetic circuit configured in this manner, the voice coil 18 is inserted in the magnetic
gap 15. When a magnetic field acts from the first top plate 12a to the second top plate 12b and a
current corresponding to the voice signal flows in the voice coil 18 in this magnetic field, the
polarity and current value of the current flowing in the voice coil 18 The voice coil 18 is
displaced according to. According to the displacement of the voice coil 18, a diaphragm (not
shown) of the speaker is vibrated to constitute a speaker as an electro-acoustic transducer that
generates sound corresponding to the electric sound signal. The voice coil and the diaphragm, a
part of which is joined to the voice coil and driven by the voice coil, are the same as in the prior
art, and thus the description thereof is omitted.
[0025]
As described above, according to the present embodiment, the thicknesses e and f of the first and
second magnets 11 a and 11 b are smaller than the value of the air gap dimension b of the
magnetic gap 15 and different from each other. By setting to, the magnetic flux density m in the
magnetic gap 15 is improved, and a speaker as a thin electroacoustic transducer excellent in
acoustic characteristics can be provided. Further, the magnetic flux density m in the magnetic
gap 15 can be further improved by setting the thicknesses c and d of the first and second top
plates 12 a and 12 b to different values. Further, the cost can be reduced by forming the first and
second magnets 11 a and 11 b by magnets of different materials. In the present embodiment,
although the shape of the magnetic circuit has been described as an example of the circular
shape, the present invention is not limited to this, and the present invention is applicable to
magnetic circuits of other shapes such as oval and rectangular shapes. Can.
Comparative example
[0026]
FIG. 3 shows an example in which the relationship between the thicknesses of the first and
second magnets and the first and second top plates is reversed. As shown in FIG. 3, in this
magnetic circuit, the thickness k of the second magnet 21b is set to a smaller value than the
thickness j of the first magnet 21a. Further, the thickness h of the second top plate 22 b is set to
a large value with respect to the thickness g of the first top plate 22 a. Therefore, the outlet of
the magnetic flux is narrow and the inlet is wide, the magnetic flux is dispersed, and the magnetic
flux of the air gap is lowered. As described above, in order to improve the magnetic flux density
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m in the magnetic gap 15, it is necessary to set the magnetic flux outlet so as to be wide and the
inlet narrow.
[0027]
FIG. 4 shows a magnetic circuit which is a main part of the speaker in the second embodiment of
the present invention, FIG. 4 (a) is a plan view, and FIG. 4 (b) is a sectional view taken on line A-A
in FIG. . 5 also shows a magnetic circuit, and FIG. 5 (a) is a cross-sectional view taken along the
line B-B in FIG. 4 (a), and FIG. 5 (b) is a partially enlarged view of FIG. It is an expanded sectional
view. In the present embodiment, an oval magnetic circuit is described as an example.
[0028]
As shown in FIG. 4 and FIG. 5, the magnetic circuit of the speaker in the present embodiment
includes an elongated disc-like yoke 33 having an opening at the center and a first elongated
cylindrical shape disposed at the center on the yoke 33. A pair of rectangular plates which are
disposed opposite to each other with a predetermined gap on the magnet 31a and a part of the
lateral side surface of the periphery of the first magnet with a predetermined interval and
extended along the longitudinal direction of the first magnet 31a From the second magnets 31b
and 31c, the first top plate 32a disposed on the top surface of the first magnet 31a, and the pair
of top plates disposed on the top surfaces of the second magnets 31b and 31c. And a second top
plate 32b, 32c. In the present embodiment, the second magnets 31b and 31c have the same
shape, and the second top plates 32b and 32c also have the same shape. As described above, in
the magnetic circuit in the present embodiment, the first magnet 31a and the second magnets
31b and 31c are held between the yoke 33 and the first top plate 32a and the second top plates
32b and 32c. It is configured.
[0029]
The first magnet 31a has its central axis aligned with the central axis of the magnetic circuit and
is disposed on the yoke 33. For example, one face side is magnetized to an N pole and the other
face to an S pole. Further, the first top plate 32a disposed on the side facing the yoke 33 of the
first magnet 31a is a magnetic body having an elongated cylindrical shape with an outer
diameter larger than the outer diameter of the first magnet 31a. .
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[0030]
The second magnets 31b and 31c are disposed on the yoke 33 on the outer side in the short
direction of the first magnet 31a, and for example, magnetize one surface side to an S magnetic
pole and the other surface side to an N magnetic pole. At this time, the first magnet 31a and the
second magnets 31b and 31c are magnetized such that the opposing sides have opposite
magnetic poles. Further, one second top plate 32b disposed on the side facing the yoke 33 of the
second magnet 31b has a rectangular plate shape like the second magnet 31b, and the side
surface on the inner side in the longitudinal direction is the first The two magnets 31 b are
arranged so as to be located inward of the longitudinal inner side, that is, the center. Similarly,
the other second top plate 32c is also in the form of a rectangular plate like the second magnet
31c, and the longitudinal inner side is inside the longitudinal inner side of the second magnet
31c, ie, It is arranged to be at a position from the center. Further, the second top plates 32b and
32c formed of a pair of magnets are all magnetic bodies.
[0031]
The thickness f of the second magnets 31 b and 31 c is set to a larger value than the thickness e
of the first magnet 31 a. The thickness d of the second top plates 32 b and 32 c is set to a
smaller value than the thickness c of the first top plate 32 a. In the state where the first top plate
12a and the second top plates 32b and 32c are stacked on the first magnet 31a and the second
magnets 31b and 31c, respectively, the upper surfaces thereof become substantially the same
plane. The dimensions of each part are set as follows.
[0032]
In addition, a magnetic gap 35 having a gap of a distance b is formed between the outer
periphery of the first top plate 32 a and the inner side surface of one second top plate 32 b.
Similarly, a magnetic gap 35 having a gap of a distance b is formed between the outer periphery
of the first top plate 32a and the inner side surface of the other second top plate 32b. Further,
the thickness e of the first magnet 31 a and the thickness f of the second magnets 31 b and 31 c
are all set to smaller values than the air gap distance b of the magnetic gap 35. As described
above, by disposing the second magnets 31b and 31c opposite to each other with a
predetermined interval at a part of the periphery of the first magnet 31a, one of the first top
plate 32a from the first top plate 32a is provided. The magnetic field of high magnetic flux
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density m acts on the second top plate 32b, and the magnetic flux density m acting on the air gap
of the magnetic gap 35 is improved. Similarly, a magnetic field of high magnetic flux density m
acts from the first top plate 32a to the other second top plate 32c, and the magnetic flux density
m acting on the air gap of the magnetic gap 35 is improved.
[0033]
Furthermore, by setting the thickness c of the first top plate 32a to a value larger than the
thickness d of the second top plates 32b and 32c, the flux outlet is larger, the flux inlet is smaller,
and the flux is more The magnetic flux density m which concentrates and acts on the air gap of
the magnetic gap 35 is further improved. The material and thickness of the first magnet 31a and
the second magnets 32b and 32c, and the thickness of the first top plate 32a and the second top
plates 32b and 32c are the same as in the first embodiment. I omit explanation.
[0034]
The voice coil 38 is inserted in the magnetic gap 35 in the magnetic circuit configured as
described above. As in the first embodiment, a magnetic field acts from the first top plate 32a to
the second top plates 32b and 32c to vibrate the diaphragm (not shown) with the displacement
of the voice coil 18, thereby performing electroacoustics. Configure a speaker as a converter. The
other points are the same as in the first embodiment, and thus the description thereof is omitted.
[0035]
As described above, according to the present embodiment, when the magnetic circuit is mounted
on a rectangular device such as a portable telephone, the volume of the magnetic circuit can be
increased by making the shape of the magnetic circuit oval. The sound pressure of the speaker is
improved, and a thin electroacoustic transducer excellent in acoustic characteristics can be
provided. Also in the present embodiment, the same effect as that of the first embodiment can be
obtained.
[0036]
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FIG. 6 shows a magnetic circuit which is a main part of the speaker in the third embodiment of
the present invention, FIG. 6 (a) is a plan view, and FIG. 6 (b) is a sectional view taken along line
AA in FIG. . 7 also shows a magnetic circuit, and FIG. 7 (a) is a cross-sectional view taken along
the line B-B in FIG. 6 (a), and FIG. 7 (b) is a partially enlarged view of FIG. 7 (a). It is an expanded
sectional view. The present embodiment is an example of a rectangular magnetic circuit, and is
substantially the same as the second embodiment except that the shape of the circuit is different.
A brief description will be given below.
[0037]
As shown in FIGS. 6 and 7, the magnetic circuit of the speaker according to the present
embodiment has a rectangular yoke 43 having an opening at its center, and a rectangular shape
having an opening at its center disposed on the yoke 43. A rectangular plate which is disposed
opposite to each other at predetermined intervals on both side surfaces corresponding to the
long side of the first magnet 41a and the first magnet 41a, and is extended along the long side of
the first magnet 41a Of second magnets 41b and 41c consisting of a pair of magnets forming a
first shape, a first top plate 42a disposed on the top surface of the first magnet 41a, and a pair
disposed on the top surfaces of the second magnets 41b and 41c And a second top plate 42b,
42c comprising a top plate of In the present embodiment, the second magnets 41b and 41c have
the same shape, and the second top plates 42b and 42c also have the same shape. As described
above, in the magnetic circuit in this embodiment, the first magnet 41a and the second magnets
41b and 41c are held between the yoke 43 and the first top plate 42a and the second top plates
42b and 42c. It is configured.
[0038]
The first magnet 41a has its central axis aligned with the central axis of the magnetic circuit and
is disposed on the yoke 43. For example, one face side is magnetized to an N pole and the other
face to an S pole. The first top plate 42a disposed on the side facing the yoke 43 of the first
magnet 41a is a magnetic body having a rectangular shape with an outer diameter larger than
the outer diameter of the first magnet 41a.
[0039]
The second magnets 41b and 41c are disposed on the yoke 43 outside the long side of the first
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magnet 41a, and for example, one surface side is magnetized to an S magnetic pole and the other
surface side is magnetized to an N magnetic pole. At this time, the first magnet 41a and the
second magnets 41b and 41c are magnetized such that the opposing sides have mutually
opposite magnetic poles. Further, one second top plate 42b disposed on the side facing the yoke
43 of the second magnet 41b has a rectangular plate shape like the second magnet 41b, and the
inner side surface of the long side is the first The two magnets 41 b are arranged so as to be
located inward from the inner side surface of the long side of the long side, that is, closer to the
center. Similarly, the other second top plate 42c also has a rectangular plate shape like the
second magnet 41c, and the inner side surface of the long side is inner than the inner side
surface of the long side of the second magnet 41c, ie, It is arranged to be at a position from the
center. The second top plates 42b and 42c, which are a pair of magnets, are all magnetic bodies
as in the second embodiment.
[0040]
The thickness e of the first magnet 41a, the thickness f of the second magnets 41b and 41c, the
thickness c of the first top plate 42a, and the thickness d of the second top plates 42b and 42c.
The relationship is the same as that of the second embodiment, and thus the description is
omitted. Further, a magnetic gap 45 having a gap of a distance b is formed between the outer
periphery of the first top plate 42a and the inner side surface of one second top plate 42b, and
similarly, the first top plate 42a is formed. A magnetic gap 45 having an air gap of a distance b is
also formed between the outer circumference of the second and the inner side surface of the
other second top plate 42c. The voice coil 48 is inserted into the magnetic gap 45, but the
relationship between the gap distance b of the magnetic gap 45 and the thickness e of the first
magnet 34a and the thickness f of the second magnets 41b and 41c is also the second
embodiment. The description is omitted because it is the same as the above.
[0041]
As described above, by arranging the second magnets 41b and 41c opposite to each other with a
predetermined distance on the long side of the first magnet 41a, the second gap from the first
top plate 42a to the second gap is formed. The magnetic field of the high magnetic flux density m
acts on the top plate 42b of the above, and the magnetic flux density m acting on the air gap of
the magnetic gap 45 is improved. Similarly, a magnetic field of high magnetic flux density m acts
from the first top plate 42a to the other second top plate 42c, and the magnetic flux density m
acting on the air gap of the magnetic gap 45 is improved.
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[0042]
Further, by setting the thickness c of the first top plate 42a to a value larger than the thickness d
of the second top plates 42b and 42c, the flux outlet is larger, the flux inlet is smaller, and the
flux is more The magnetic flux density m which is concentrated and acts on the air gap of the
magnetic gap 45 is further improved. The other points are the same as in the second
embodiment and the description will be omitted. As described above, according to this
embodiment, the same effect as that of the second embodiment can be obtained.
[0043]
In the second and third embodiments, the shape of the magnetic circuit has been described as an
example of an oval shape or a rectangular shape, but the present invention is not limited to this,
and is applicable to magnetic circuits of other shapes such as circular. be able to. Moreover, in
this embodiment, although the speaker was demonstrated as an example as an electroacoustic
transducer, it is not limited to this, It is applicable also in other electroacoustic transducers, such
as a microphone.
[0044]
It is a figure which shows the principal part of the speaker in Example 1 of this invention, FIG. 1
(a) is a top view, FIG.1 (b) is AA sectional drawing in FIG. 1 (a). It is a partial expanded sectional
view of FIG.1 (b). FIG. 3A is a cross-sectional view, and FIG. 3B is a partial enlarged crosssectional view of FIG. 3A. It is a figure which shows the principal part of the speaker in Example
2 of this invention, FIG. 4 (a) is a top view, FIG.4 (b) is AA sectional drawing in FIG. 4 (a). It is a
figure which shows the BB cross section in FIG. 4 (a), FIG. 5 (a) is a BB cross section figure, FIG.5
(b) is the elements on larger scale of FIG. 5 (a). It is a figure which shows the principal part of the
speaker in Example 3 of this invention, FIG. 6 (a) is a top view, FIG.6 (b) is AA sectional drawing
in FIG. 6 (a). It is a figure which shows the BB cross section in Fig.6 (a), Fig.7 (a) is a BB cross
section figure, FIG.7 (b) is the elements on larger scale of the sectional view of Fig.7 (a). FIG. 8A is
a cross-sectional view of the speaker, and FIG. 8B is a cross-sectional view of main parts of the
speaker.
Explanation of sign
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[0045]
DESCRIPTION OF SYMBOLS 1 magnet 2 top plate 3 yoke 4 magnetic circuit 5 magnetic gap 6
frame 7 diaphragm 8 voice coil 11a, 21a 1st magnet 11b, 21b 2nd magnet 12a, 22a 1st top
plate 12b, 22b 2nd top Plate 13 Yoke 15 Magnetic gap 18 Voice coil 31a, 41a Center magnet
31b, 41b Outer magnet 31c, 41c Outer magnet 33, 43 Yoke 35, 45 Magnetic gap 38, 48 Voice
coil
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