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JP2016131356

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DESCRIPTION JP2016131356
Abstract: To provide a speaker device capable of suppressing a drop in sound pressure in a
specific sound range. A first space S1 is formed on the back side of a first diaphragm 21 of a
diaphragm 4 and in communication with a magnetic gap 14 of a magnetic circuit 3, and is
formed in a magnetic circuit 3 A second space S2 in communication, a third space S3 which is
formed on the back side of the second diaphragm 22 of the diaphragm 4 and is in
communication with the magnetic gap 14 and surrounded by the first space S1, and An air flow
which is disposed in the second space S2 and flows in the second space S2 between the first
space S1 and the third space S3 via the second space S2 according to the behavior of the
diaphragm 4 And a resistor 7 to be a fluid resistance. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates mainly to a speaker device mounted on headphones.
[0002]
Conventionally, as a speaker device of this type, an electro-acoustic transducer is known which is
provided with a diaphragm including a central vibrating portion, an outer peripheral vibrating
portion and an edge (see Patent Document 1).
The electro-acoustic transducer includes a frame, a magnetic circuit disposed at the center of the
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frame, and a diaphragm facing the magnetic circuit fixed to the outer edge of the frame. The
magnetic circuit has an outer magnetic pole, an inner central pole, and a permanent magnet
provided between the magnetic pole and the central pole. The diaphragm includes a central
vibrating portion having a dome shape in cross section, an outer peripheral vibrating portion
disposed outside the central vibrating portion, a connecting portion disposed between the central
vibrating portion and the outer peripheral vibrating portion, and an outer portion of the outer
circumferential vibrating portion. And an edge fixed to the frame. A voice coil is vertically
provided at the connecting portion, and the voice coil is suspended in a gap between the
magnetic pole and the central pole. And a corrugation is provided in the outer periphery
vibration part.
[0003]
JP, 2009-246739, A
[0004]
In such a conventional electroacoustic transducer, a volume change occurs in the back space of
the diaphragm in accordance with the vibration (behavior) of the diaphragm.
On the other hand, the back space of the diaphragm is the first space S1 which is the back space
of the outer peripheral vibration portion, the second space S2 in the magnetic circuit connected
to the gap, and the back surface of the central vibration portion bordering the voice coil. And a
third space S3 which is a space (see FIG. 8). For this reason, when the outer peripheral vibrating
portion and the central vibrating portion vibrate through the voice coil and a volume change
occurs in the back space of these diaphragms, minute movement of air occurs between these
spaces. The minute movement of the air causes a problem that the sound pressure level is
lowered in a partial range of the frequency characteristic. Hereinafter, this problem will be
described with reference to a schematic diagram.
[0005]
FIG. 8 is a view schematically showing the above-mentioned conventional electroacoustic
transducer, and FIG. 9 is a view showing a cycle t of vibration at three frequencies (time is shown
in logarithm). FIG. 10 and FIG. 11 are diagrams showing the flow of air in each back space with
respect to the various vibrations described above. As shown in FIG. 8, the first space S1 is on the
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back side of the outer peripheral vibrating portion 101 of the diaphragm, the second space S2
communicating with the gap 102 a in the magnetic circuit 102, and the back of the central
vibrating portion 103. A third space S3 is configured on the side. That is, the first space S1, the
second space S2, and the third space S3 communicate with each other via the gap 102a. Further,
the first space S1 communicates with the outside through the frame opening 104 (flow passage)
formed with a frame, and the third space S3 is a projection opening 105 (flow passage) formed at
the axial center of the columnar protrusion. It communicates with the outside through
[0006]
On the other hand, in the vibration period of FIG. 9, for example, time t3 is 1/4 (t3 = 0.25 ms) of
the period corresponding to 1000 Hz, and time t2 is 1/4 (t3 = 0) of the period corresponding to
10000 Hz. The time t1 represents 1/4 (t3 = 0.0125 ms) of the period corresponding to 20000
Hz.
[0007]
Hereinafter, qualitative micro-movement of air among the first space S1, the second space S2,
and the third space S3 which are the back space will be described with reference to FIGS. 10 and
11. FIG.
The volume of the space S1 is larger than the volume of the space S3. FIG. 10 shows a case
where the outer peripheral vibration unit 101 and the central vibration unit 103 move upward in
the figure due to the vibration of the voice coil 106.
[0008]
FIG. 10A shows the case where the outer peripheral vibration unit 101 and the central vibration
unit 103 move upward due to the vibration of “time t1”. In this case, the air minutely moves
from the frame opening 104 and the space S2 to the space S1 which has a negative pressure due
to the upward movement of the outer peripheral vibration portion 101. Similarly, the air
minutely moves from the projection opening 105 and the space S2 to the space S3 which has
become negative pressure due to the upward movement of the central vibrating portion 103. In
this case, since the vibration (time t1) is sufficiently short, the amount of movement (amount of
inflow) of air into the first space S1 and the third space S3 is small, and the air in the opening
104 and the opening 105 is respectively Move by the small amount needed for space S1 and
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space S3. Note that the resistances of air flowing into the space S1 and the space S2 from the
opening 104 and the opening 105 are equal to each other. When the time t1 is sufficiently short,
the outer peripheral vibration unit 101 and the central vibration unit 103 vibrate so as to follow
the movement of the voice coil 15 (see the arrow in the drawing).
[0009]
FIG. 10B shows the case where the outer peripheral vibration portion 101 and the central
vibration portion 103 move upward due to the vibration of “time t2> t1”. In this case, since the
volume of the space S1 is larger than that of the space S3, the volume increased in the space S1
by the upward displacement of the outer peripheral vibration unit 101 is increased in the space
S3 by the upward displacement of the central vibration unit 103. Greater than volume. Therefore,
when the upward displacement of the outer peripheral vibrating portion 101 and the central
vibrating portion 103 continues for time t2 (> t1), the air moves from the space S3 toward the
space S2 having a smaller air pressure as shown in FIG. 10 (b). Occur. By this, the pressure of the
air in space S3 becomes smaller than space S1. This causes a force to prevent the upward
displacement of the central vibrating portion 103 following the movement of the voice coil 106,
and the sound pressure emitted from the central vibrating portion 103 is reduced (see the arrow
in the drawing).
[0010]
FIG. 10C shows the case where the outer circumferential vibration portion 101 and the central
vibration portion 103 move upward due to the vibration of “time t3> t2”. In this case, the
increase in the volume of the space S1 is reduced, and the amount of movement of air from the
space S3 to the space S2 and from the space S2 to the space S1 is reduced. c) See, the pressure of
air in the space S3 is increased compared to the pressure of air in the space S1. Therefore, when
time t3 during which voice coil 106 vibrates is sufficiently large (the number of cycles is
sufficiently small), the force that impedes upward displacement of central vibrating portion 103
is small, and the sound pressure emitted from central vibrating portion 103 is the outer
periphery There is no significant drop compared to the sound pressure emitted from the
vibration part 101 (see the arrow in the figure).
[0011]
As described above, in the vibration of “time t2”, the upward movement of the central
vibrating portion 103 is suppressed compared to the vibrations of “time t1” and “time t3”
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due to the difference in volume between the space S1 and the space S3.
[0012]
Similarly, FIG. 11 shows a case where the outer peripheral vibrating portion 101 and the central
vibrating portion 103 move downward in the figure due to the vibration of the voice coil 106.
11 (a) shows the vibration at time t1, FIG. 11 (b) shows the vibration at time t2, and FIG. 11 (c)
shows the flow of air with respect to the vibration at time t3. When the central vibrating portion
103 moves downward, an air flow reverse to that in the case of the upward movement occurs.
[0013]
As described above, in the conventional electroacoustic transducer, due to the difference in
volume between the space S1 and the space S3, the upward movement and the downward
movement of the central vibrating portion 103 are suppressed with respect to the vibration of
"time t2." Therefore, it is assumed that the sound pressure level is lowered in the range of center
frequency = 10000 Hz corresponding to the vibration at time t2.
[0014]
The present invention is made based on the above assumption, and an object of the present
invention is to provide a speaker device capable of suppressing a reduction in sound pressure in
a specific sound range.
[0015]
The speaker device according to the present invention is configured on the back side of the
diaphragm, and includes a first space communicating with the magnetic gap of the magnetic
circuit, a second space configured in the magnetic circuit communicating with the magnetic gap,
and the diaphragm And a third space which is in communication with the magnetic gap and is
surrounded by the first space, and is disposed in the second space to provide fluid resistance to
the air flow flowing in the second space. And a resistor.
[0016]
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In this case, a voice coil inserted into the magnetic gap is further provided, and the diaphragm is
formed to have a larger outer diameter than the voice coil, and a first diaphragm defining a first
space, and a first vibration. It is preferable to have the 2nd diaphragm which the outer periphery
is enclosed by the board and which comprises the 3rd space.
[0017]
In these cases, it is preferable to further include a first flow passage communicating the first
space with the outside of the speaker device, and a second flow passage communicating the third
space with the outside.
[0018]
In this case, the volume of the third space is preferably smaller than the volume of the first space.
[0019]
In this case, in the resistor, the fluid resistance of the air flow flowing in and out between the
second flow passage and the third space, and the fluid resistance of the air flow flowing in and
out between the second space and the third space It is preferable that the size is larger than that.
[0020]
Preferably, the volume of the first space is smaller than the volume of the third space.
[0021]
In this case, in the resistor, the fluid resistance of the air flow flowing in and out between the first
flow passage and the first space, the fluid resistance of the air flow flowing in and out between
the second space and the first space It is preferable that the size is larger than that.
[0022]
On the other hand, the resistor is preferably disposed to follow the flow of the air flow.
[0023]
Similarly, the resistor is preferably disposed to oppose the flow of the air flow.
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[0024]
In these cases, the second space is formed in a substantially annular shape, and the resistor is
disposed in at least one of the bottom, the inner circumference and the outer circumference of
the second space. preferable.
[0025]
Furthermore, the resistor is preferably made of non-woven fabric.
[0026]
It is a cross-sectional schematic diagram of the speaker apparatus which concerns on 1st
Embodiment.
It is a cross-sectional schematic diagram around the 2nd space of 1st Embodiment, (a) is a crosssectional schematic diagram at the time of providing a resistor, (b) is a cross-sectional schematic
diagram at the time of not providing a resistor. .
It is a schematic diagram which shows the flow of the air in back surface space when the
diaphragm in 1st Embodiment moves up.
It is a schematic diagram which shows the flow of the air in back space when the diaphragm in
1st Embodiment moved downward.
It is a frequency characteristic line in the speaker apparatus concerning a 1st embodiment.
It is a cross-sectional schematic diagram around the 2nd space concerning the modification of a
1st embodiment.
It is a cross-sectional schematic diagram of the speaker apparatus concerning 2nd Embodiment.
It is the figure which represented the conventional electroacoustic transducer typically.
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It is a figure which shows the period t (time is logarithmic expression) of the vibration in three
frequencies.
It is a figure which shows the flow of air in back space when a diaphragm of a prior art moves
up.
It is a figure which shows the flow of the air in back space when the diaphragm of a prior art
moved down.
[0027]
Hereinafter, a speaker device according to an embodiment of the present invention will be
described with reference to the attached drawings.
This speaker device is a compact device mounted on, for example, headphones, and is a so-called
full range capable of reproducing the entire audio frequency band from bass to high
temperature.
[0028]
First Embodiment FIG. 1 is a schematic cross-sectional view of a speaker device according to a
first embodiment.
As shown in the figure, the speaker device 1 includes a frame 2, a magnetic circuit 3 widely
disposed at the center of the frame 2, and a diaphragm 4 facing the magnetic circuit 3 fixed to
the outer edge of the frame 2. And have. The magnetic circuit 3 includes a magnet 13 interposed
between the outer yoke 11, the inner plate 12 and the yoke 11 below the plate 12, and a
magnetic gap 14 between the yoke 11 and the plate 12. And an inserted voice coil 15.
[0029]
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In this case, the yoke 11 is disposed at the center of the frame 2, and the magnet 13 and the
plate 12 are disposed so as to overlap at the center of the surface of the yoke 11. Further, the
voice coil 15 formed in an annular shape is fixed to the back surface (rear surface) of the
diaphragm 4 by adhesion or the like.
[0030]
The diaphragm 4 has an annular first diaphragm 21 and a second vibrator 22 which is
surrounded by the first diaphragm 21 and has a dome-shaped cross section facing the plate 12.
The first diaphragm 21 and the second vibrating portion 22 may be integrally formed or
separately formed. In any case, the diaphragm 4 is made of a material having a high rigidity
(Young's modulus) and a high internal loss, a polymer (resin), a paper, a metal, a composite, or
the like. The voice coil 15 is fixed to the back of the boundary between the first diaphragm 21
and the second vibrating portion 22.
[0031]
The cross section of the second vibrating portion 22 including the sound emitting direction Y of
the speaker device 1 is formed in a dome shape, and the outer diameter of the second vibrating
portion 22 is formed substantially the same as the voice coil 15. From this, the second vibration
unit 22 functions as a diaphragm portion that reproduces a sound range including high sound
(for example, middle sound to high sound). The second vibrating portion 22 also covers the plate
12 and the magnet 13 and also functions as a dust cap.
[0032]
The first diaphragm 21 is located outside the outer periphery of the second vibrating portion 22
and is formed in an annular shape as a whole. Each section of the first diaphragm 21 is formed in
a dome shape in cross section including the sound emission direction Y of the speaker device 1,
and the inner diameter is approximately the same diameter as the voice coil 15 and the outer
diameter is larger than the voice coil 15. The diameter is formed. From this, the first diaphragm
21 functions as a diaphragm portion that reproduces a range including low tones (for example,
low to medium tones). The peripheral edge portion of the first diaphragm 21 is fixed to the frame
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2 and also functions as a so-called edge.
[0033]
As described above, since the diaphragm 4 is configured by the two diaphragm portions of the
first diaphragm 21 and the second vibrating portion 22 with the voice coil 15 as the boundary,
the speaker device 1 according to the present embodiment can Has become a thin, full-band
speaker. The outer shape of the second vibrating portion 22 and the inner diameter of the first
diaphragm 21 may be smaller than the voice coil 15, or may be larger.
[0034]
[Rear Space of Diaphragm] On the other hand, the rear side of the second vibrator 22 (sound
radiation to ensure appropriate vibration (behavior) of the first diaphragm 21 and the second
vibrator 22 of the diaphragm 4 A third space S3 is formed on the opposite side to the direction Y,
and a first space S1 is formed on the back side of the first diaphragm 21 (opposite to the sound
radiation direction Y). In the magnetic circuit 3 described above, a second space S2
communicating with the magnetic gap 14 is formed. The second space S2 is in communication
with the third space S3 and the first space S1 via the magnetic gap 14. Further, the volume of the
first space S1 is formed larger than the volume of the third space S3.
[0035]
The third space S3 communicates with the outside through the plate 12, the magnet 13, the yoke
11, and the second flow path 32 formed through the center of the frame 2. Further, the second
flow path 32 has a main body flow path portion 32a, an inner opening 32b communicating with
the third space S3, and an outer opening 32c communicating with the outside. When the second
vibrating portion 22 vibrates from the voice coil 15 and a volume change occurs in the third
space S3, air is generated between the third space S3 and the outside through the second flow
path 32. Move slightly. In addition, the outer side opening 32c formed in the flame | frame 2 is
comprised by several small holes in order to prevent the penetration | invasion of dust etc. FIG.
[0036]
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The first space S1 is formed annularly at the radially outer side of the third space S3. Further, the
first space S1 is in communication with the outside through the first flow passage 31 formed
annularly as viewed in the sound radiation direction Y. The first flow path 31 includes an air
chamber 31a annularly formed in the frame 2, a plurality of inner communication ports 31b
communicating with the first space S1, and a plurality of outer communication ports 31c
communicating with the outside. Have. When the first diaphragm 21 vibrates due to the
vibration of the voice coil 15 and a volume change occurs in the first space S1, the first space S1
and the outside are mutually exchanged via the first flow path 31. The air moves slightly between
the two.
[0037]
The second space S2 has an outer peripheral portion of the magnet 13 as an inner peripheral
portion 33A, an inner peripheral portion of the yoke 11 as an outer peripheral portion 33B, and
an inner peripheral portion of the yoke 11 as a bottom portion 33C. It is formed (defined). The
second space S2 is in communication with the third space S3 and the first space S1 by the
magnetic gap 14 formed annularly. The voice coil 15 is located in the magnetic gap 14, and the
magnetic gap 14 communicates with the second space S2.
[0038]
When the first diaphragm 21 and the second diaphragm 22 vibrate as the voice coil 15 vibrates,
the volume of the third space S3 and the first space S1 change. Although the details will be
described later, there is a problem that when air flow is generated in the second space S2 due to
this volume change, the frequency characteristic is deteriorated at the time of regeneration (see
FIGS. 10 (b) and 11 (b)). . Therefore, in the present embodiment, the resistor 7 is provided in the
second space S2 to be a fluid resistance to the air flow flowing between the third space S3 and
the first space S1.
[0039]
FIG. 2 is a schematic cross-sectional view enlarging the periphery of the second space S2, and
FIG. 2 (a) is a view when the resistor 7 is provided, and FIG. 2 (b) is a view when the resistor 7 is
not provided. . As shown in FIG. 2A, in the present embodiment, the resistor 7 is disposed in the
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bottom 33C of the second space S2 defined by the yoke 11 and the magnet 13. That is, the
resistor 7 is formed in a ring shape as a whole in a thick plate shape in cross section so as to be
accommodated in the bottom portion 33C. As described above, the voice coil 15 is inserted in the
magnetic gap 14, and the tip of the voice coil 15 is located in the second space S2.
[0040]
Therefore, the air flow flowing between the third space S3 and the first space S1 flows around
the voice coil 15 in the second space S2 (see the arrow in FIG. 2). In this case, the resistor 7 is
disposed at the bottom 33C of the second space S2 so as to follow the flow of air (air flow). The
actual flow of air around the voice coil 15 may be turbulent, but in FIG. 2 this is schematically
represented as a temporally average flow.
[0041]
The resistor 7 is a non-woven fabric of natural fibers or chemical fibers, and preferably has a
raised surface. Therefore, the resistor 7 of the present embodiment is made of felt in
consideration of cost, handling and the like. The air flowing along the resistor 7 receives fluid
resistance (flow path frictional resistance) from the surface of the resistor 7, and the flow is
suppressed. Although the details will be described later, the air flowing so as to make a U-turn in
the second space S2 is subjected to fluid resistance by the resistor 7 (comparison of FIG. 2A and
FIG. 2B).
[0042]
By the way, air flows into and out of the third space S3 from the second flow passage 32 and the
second space S2. In the present embodiment, the resistor 7 is provided in the second space S2.
Thus, air can be more easily flowed into and out of the second space 32 in the third space S3.
Similarly, in the first space S <b> 1, the air flows more easily from the first flow path 31.
[0043]
[Operation and Effect] Here, with reference to FIGS. 3 and 4, the flow of air in the back space
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when the resistor 7 is installed in the second space S2 will be described qualitatively. FIG. 3
shows the case where the first diaphragm 21 and the second diaphragm 22 move upward in the
figure due to the vibration of the voice coil 15, and FIG. 3 (a), FIG. 3 (b) and FIG. 3 (c)
corresponds to FIGS. 10 (a), 10 (b) and 10 (c) without the resistor 7, respectively.
[0044]
FIG. 3A shows the case where the first diaphragm 21 and the second diaphragm 22 move
upward due to the vibration of “time t1”. In this case, the air minutely moves from the first
flow passage 31 and the second space S2 to the first space S1 which has a negative pressure due
to the upward movement of the first diaphragm 21. Similarly, the air minutely moves from the
second flow passage 32 and the second space S2 to the third space S3 which has a negative
pressure due to the upward movement of the second diaphragm 22. In this case, since the
vibration (time t1) is sufficiently short, the moving amount (inflow amount) of air to the first
space S1 and the third space S3 is small, and the first flow path 31 and the second flow path The
air at 32 travels by the small amount required for the first space S1 and the third space S3,
respectively. In addition, the resistance at the time of the air inflowing to 1st space S1 and 2nd
space S2 from 1st flow path 31 and 2nd flow path 32 respectively shall be equivalent. When the
time t1 is sufficiently short, the first diaphragm 21 and the second diaphragm 22 vibrate so as to
follow the movement of the voice coil 15 (see the arrow in the figure).
[0045]
FIG. 3B shows the case where the first diaphragm 21 and the second diaphragm 22 move
upward due to the vibration of “time t2> t1”. In this embodiment, since the volume of the first
space S1 is larger than that of the third space S3, the volume increased in the first space S1 by
the upward displacement of the first diaphragm 21 is the second volume. The displacement of
the diaphragm 22 in the upper direction of the second space 22 is larger than the volume which
increases in the third space S3. Therefore, when the upward displacement of the first diaphragm
21 and the second diaphragm 22 continues for time t2 (> t1), as shown in FIG. 3B, the second air
pressure from the third space S3 is small. Movement of air occurs toward the space S2 of In the
present embodiment, since the resistor 7 is provided in the second space S2, the flow of air
through the second space S2 is blocked by the resistor 7 and becomes smaller. Since the
pressure of air in the third space S3 does not decrease much more than the first space S1, the
force that impedes the upward displacement of the second diaphragm 22 following the
movement of the voice coil 106 becomes smaller . Therefore, the decrease in the sound pressure
emitted from the second diaphragm 22 is smaller (see the arrow in the drawing).
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[0046]
FIG. 3C shows the case where the first diaphragm 21 and the second diaphragm 22 move
upward due to the vibration of “time t3> t2”. In this case, the increase in volume of the first
space S1 is small, and the amount of movement of air from the third space S3 to the second
space S2 and from the second space S2 to the first space S1 is small. Become. At that time, the air
from the second flow path 32 or the like moves (see FIG. 3C), and the pressure of the air in the
third space S3 is lower than the pressure of the air in the first space S1. The pressure rises.
Therefore, when the time t3 in which the voice coil 106 vibrates is sufficiently large (the number
of cycles is sufficiently small), the force that impedes the upward displacement of the second
diaphragm 22 is small, and the sound emitted from the second diaphragm 22 The pressure is not
significantly reduced compared to the sound pressure emitted from the first diaphragm 21 (see
the arrow in the drawing).
[0047]
FIG. 4 shows the case where the first diaphragm 21 and the second diaphragm 22 move
downward in the figure due to the vibration of the voice coil 15, and FIG. 4 (a), FIG. 4 (b) and FIG.
4 (c) correspond to FIGS. 11 (a), 11 (b) and 11 (c) without the resistor 7, respectively. 4A shows
the flow of air with respect to the vibration at time t1, FIG. 4B shows the vibration at time t2, and
FIG. 4C shows the vibration at time t3. In this case, when the first diaphragm 21 and the second
diaphragm 22 move downward, a flow of air reverse to that in the case of the upward movement
of FIG. 3 is generated. Therefore, in the first diaphragm 21 and the second diaphragm 22, the
pressure of the air in the third space S3 is greater than that of the first space S1 only at time t2
(see FIG. 4B). ). In this embodiment, since the resistor 7 is provided in the second space S2, the
force that hinders the upward displacement of the second diaphragm 22 following the movement
of the voice coil 106 becomes smaller, and the second The reduction of the sound pressure
emitted from the diaphragm 22 of the above becomes smaller (see the arrow in the figure).
[0048]
As described above, in the speaker device 1 of the first embodiment, the resistor 7 provided in
the second space S2 even if the volume of the first space S1 is formed larger than the volume of
the third space S3. Thus, the flow of air is suppressed between the first space S1 and the third
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space S3. For this reason, it is possible to suppress a drop in the sound pressure level particularly
in the range of center frequency = 10000 Hz corresponding to the vibration at time t2.
[0049]
FIG. 5 shows the frequency characteristic of the speaker device 1 of the first embodiment. As
shown in the figure, a remarkable rise in sound pressure level is confirmed in the sound range of
9 kHz to 15 kHz as compared to one having the resistor 7 in the second space S2 as compared to
one that does not. An increase in sound pressure level was also confirmed in the 7 kHz range.
That is, in the speaker device 1 according to the first embodiment, the resistor 7 can suppress
the decrease in the sound pressure level in the high frequency range.
[0050]
[Modification] Next, a modification of the configuration and arrangement of the resistor 7 will be
described with reference to FIG. The resistor 7A according to the first modification of FIG. 6A is
disposed in the outer peripheral portion 33B of the second space S2. That is, the resistor 7A is
formed in a cylindrical shape as a whole in a thick plate shape so as to be accommodated in the
outer peripheral portion 33B. Also in this case, the resistor 7A is disposed so as to follow the air
flow for circulating the voice coil 15. The resistor 7B according to the second modification of FIG.
6B is disposed in the inner circumferential portion 33A of the second space S2. That is, the
resistor 7B is formed in a cylindrical shape as a whole in a thick plate shape so as to be
accommodated in the inner circumferential portion 33A. Also in this case, the resistor 7B is
disposed so as to follow the air flow for circulating the voice coil 15.
[0051]
The resistor 7C of the third modified example of FIG. 6C is formed in a cross-sectional “L”
shape, and is disposed from the outer peripheral portion 33B to the bottom portion 33C of the
second space S2. Similarly, the resistor 7D of the fourth modified example of FIG. 6D is formed in
a cross-sectional “L” shape, and is disposed from the inner circumferential portion 33A to the
bottom portion 33C of the second space S2. . The resistor 7E according to the fifth modification
of FIG. 6 (e) is formed to have a U-shaped cross section, and is disposed across the outer
periphery 33B, the bottom 33C and the inner periphery 33A of the second space S2. There is.
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[0052]
On the other hand, the resistor 7F of the sixth modified example of FIG. 6F is formed in an
inverted “T” shape in cross section, and is disposed in the bottom 33C of the second space S2.
That is, in the resistor 7F, a flange portion 7Fa having an inverted “T” shape in cross section is
disposed at the bottom 33C, and a rib 7Fb extends to the vicinity of the voice coil 15. That is, the
rib portion 7Fb in this case is disposed to be orthogonal to the air flow.
[0053]
Also in these modifications, the flow of air is suppressed between the first space S1 and the third
space S3 by the resistors 7A to 7 provided in the second space S2. For this reason, in the speaker
device 1 according to the first embodiment, the resistors 7A to F7 according to these
modifications can suppress the decrease in the sound pressure level in the high sound range.
[0054]
Second Embodiment Next, a speaker device 1A according to a second embodiment will be
described with reference to FIG. In the second embodiment, parts different from the first
embodiment will be mainly described. As shown in the figure, in the speaker device 1A, the
second diaphragm 22 is formed to have a larger diameter than that of the first embodiment, and
the first diaphragm 21 is formed to be narrow. . That is, the volume of the first space S1 is
smaller than the volume of the third space S3.
[0055]
In this embodiment, the relationship between the pressure of the air in the first space S1 and the
pressure in the third space S3 in the first embodiment is reversed. That is, in this embodiment,
since the resistor 7 is provided in the second space S2, the force that hinders the upward
displacement of the first diaphragm 21 following the movement of the voice coil 106 becomes
smaller, The reduction in sound pressure emitted from the first diaphragm 21 is smaller.
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16
[0056]
[Operation / Effect] Even in the speaker device 1A according to the second embodiment, even if
the volume of the first space S1 is smaller than the volume of the third space S3, it is provided in
the second space S2 The resistor 7 suppresses the flow of air between the first space S1 and the
second space S3. For this reason, in the speaker device 1A of the second embodiment, the
resistor 7 can suppress the decrease in the sound pressure level in the middle to high range.
[0057]
Note that the diaphragm 4 of the present embodiment is configured of a second diaphragm 22
intended for good reproduction of medium to high sound and a first diaphragm 21 intended for
good reproduction of low sound to medium sound. However, the diaphragm 4 of the present
invention may be integral. Moreover, although the resistor 7 of this embodiment was comprised
with the nonwoven fabric, the thing with large fluid resistance, for example, the surface may be a
member with an uneven shape in the flow direction of air, for the resistor of this invention.
[0058]
1,1A speaker device, 2 frame, 3 magnetic circuit, 4 diaphragm, 7, 7A, 7B, 7C, 7D, 7E, 7F resistor,
14 magnetic gap, 15 voice coil, 21 first diaphragm, 22 first 2 diaphragms, 31 first flow channel,
32 second flow channel, 33A inner circumference, 33B outer circumference, 33C bottom, S1 first
space, S2 second space, S3 third space
12-05-2019
17
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