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JP2005303855

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005303855
PROBLEM TO BE SOLVED: To provide a speaker device in which the generation of an area with
low sound pressure level in a middle sound area and a high sound area is suppressed, and the
continuity of the sound pressure level is secured. SOLUTION: An outer edge of a diaphragm 7 is
attached to a frame 9 via an edge portion 8, and an auxiliary diaphragm 10 is attached to a
portion of the edge portion 8 where a resonance mode is generated. The diaphragm portion of
the auxiliary diaphragm 10 extends in the outer peripheral direction of the diaphragm 7 from the
mounting position. The auxiliary diaphragm 10 is disposed on the front side of the speaker
device SP. The sub-diaphragm 10 vibrates in a frequency range where the diaphragm 7 and the
edge portion 8 resonate. [Selected figure] Figure 2
Speaker device
[0001]
The present application belongs to the technical field of a speaker device, in particular, to the
technical field of a speaker device having an auxiliary diaphragm.
[0002]
Conventionally, in order to improve the characteristics of the reproduction sound range, a
speaker device having a sub-cone corresponding to the sub-diaphragm of the present invention
has been disclosed (see, for example, Patent Document 1).
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Unexamined-Japanese-Patent No. 2003-189393
[0003]
When the outer edge of the diaphragm is attached to the frame via the edge, the edge acts as a
spring. This will be described below with reference to a schematic view showing the state of
vibration at the edge portion shown in FIG.
[0004]
In general, the edge portion 8 is made of a soft material, and in the bass region, the edge portion
8 vibrates as shown in FIG. 1A and acts as a mere stiffness, but in the mid tone region and the
high tone region, respectively. 1 (b) and (c) vibrate to cause resonance. That is, in FIG. 1B, natural
vibration corresponding to primary resonance when fixed at both ends is performed, and in FIG.
1C, natural vibration corresponding to secondary resonance when fixed at one end is generated.
[0005]
As a result, due to these natural vibrations, areas with low sound pressure levels called peak dip
exist in the mid-tone area and the high-tone area, and the continuity of the sound pressure level
can not be maintained from the bass area to the high-tone area A condition arises. Due to this,
the reproducibility of the sound was deteriorated, and the listener was given discomfort and
anxiety.
[0006]
In the above-mentioned prior art, although the secondary diaphragm is provided on the inner
edge side of the diaphragm of the speaker device to improve the characteristics of the
reproduction sound area, when the outer edge of the diaphragm is attached to the frame through
the edge portion There has been no disclosure of any direct measures against the peak dip that
occurs in Japan.
[0007]
A place aimed by the present application is, for example, the provision of a speaker device in
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which the generation of peak dips in the middle sound area and the high sound area is
suppressed and the continuity of the sound pressure level is secured.
[0008]
Hereinafter, the present application will be described.
In addition, in order to facilitate the understanding of the present application, the reference
numerals of the attached drawings are appended in parentheses, but the present application is
not limited to the illustrated embodiment.
[0009]
In order to solve the above-mentioned subject, a speaker device (SP) concerning claim 1 vibrates
a sub diaphragm (10) which controls resonance, when a diaphragm (7) and an edge part (8)
resonate. It is characterized in that it is attached to the outer edge of the plate (7).
[0010]
In order to solve the above problems, in the speaker device (SP) according to claim 4, the outer
edge of the diaphragm (7) is attached to the frame (9) through the edge portion (8), and the
diaphragm (7) ) And the edge part (8) are separately formed, and the sub-diaphragm (10) is
attached at the same position of the diaphragm (7) as the attachment place of the diaphragm (7)
and the edge part (8) , It is characterized.
[0011]
In order to solve the above-mentioned subject, a speaker device (SP) concerning claim 8 is a
diaphragm (7) via an edge part (8) attached to places other than an outer edge and an inner edge
of a diaphragm (7). Are attached to the frame (10).
[0012]
An embodiment of a speaker device according to the present application will be described using
the drawings.
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FIG. 2 is a cross-sectional view of the speaker SP according to the embodiment of the present
application.
[0013]
The speaker SP shown in FIG. 2 is formed between the magnet 1, the center piece 2 attached to
the bottom surface of the magnet 1, the yoke 3 attached to the top surface of the magnet 1, and
the center piece 2 and the yoke 3. The voice coil 4 disposed in the magnetic gap, the bobbin 5 to
which the voice coil 4 is attached, the diaphragm 7 attached to the coil bobbin 6 formed of the
voice coil 4 and the bobbin 5, and the outer edge of the diaphragm 7 Edge 9 attached to the
frame, the frame 9 having the diaphragm 7 at a specific position via the edge 8, the subdiaphragm 10 attached to the diaphragm 7, and the center of the diaphragm 7 And the center
cap 11.
[0014]
Here, the magnet 1 is made of, for example, a magnet having a high magnetic flux density such
as a neodymium magnet, and has a disk shape having a hole in the center.
[0015]
The center piece 2 is made of, for example, a magnetic material such as iron or an alloy thereof,
and is attached to the lower surface of the magnet 1.
The center piece 2 is shaped to have a protrusion at the center, and the protrusion enters a hole
opened at the center of the magnet 1.
[0016]
The yoke 3 is made of, for example, a magnetic material such as iron or an alloy thereof, and has
a disk shape with a hole in the center, and is attached to the upper surface of the magnet 1.
A magnetic gap is formed between the inner peripheral surface of the yoke 3 and the outer
peripheral surface of the center piece 2 at a position facing the inner peripheral surface.
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[0017]
The voice coil 4 is made of, for example, a copper wire or the like, and is wound around the
bobbin 5.
[0018]
The bobbin 5 is made of, for example, kraft paper, heat-resistant plastic or the like, one end
thereof is fixed to the diaphragm 7, and the other end is wound with the voice coil 4.
The voice coil 4 and the bobbin 5 form a coil bobbin 6.
[0019]
The diaphragm 7 is formed, for example, by papermaking using paper pulp, injection molding
using a resin such as polypropylene, or pressing of an alloy thin plate such as aluminum,
titanium, beryllium, or the like.
The diaphragm 7 is fixed to the frame 9 via the edge portion 8.
[0020]
The edge portion 8 is made of, for example, cloth, urethane, rubber or the like, and returns the
diaphragm 7 to a predetermined position.
[0021]
The sub-diaphragm 10 is made of, for example, kraft paper, heat-resistant plastic, etc., and is
attached to the front side of the speaker SP at a position where resonance is suppressed when
the diaphragm 7 and the edge portion 8 resonate. The diaphragm portion extends in the outer
circumferential direction from the mounting position.
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Specifically, the attachment position of the sub-diaphragm 10 is the same position of the
diaphragm 7 as the attachment location of the outer edge of the diaphragm 7 and the edge
portion 8 (see FIG. 6B).
The diaphragm portion of the sub-diaphragm 10 needs to be large enough to emit a sound
pressure level that compensates for the peak-dip produced by the resonance between the
diaphragm 7 and the edge portion 8.
The size of the diaphragm portion of the auxiliary diaphragm 10 is determined by experiment.
[0022]
The center cap 11 is formed by, for example, pressing an alloy thin plate such as aluminum to
prevent the entry of dust into the speaker SP.
[0023]
Here, for example, the speaker SP in the present embodiment is the speaker device according to
the present invention, the diaphragm 7 is the diaphragm according to the present application, the
edge 8 is the edge according to the present application, and the frame 9 is the frame according to
the present application. The auxiliary diaphragm 10 constitutes an auxiliary diaphragm
according to the present invention.
[0024]
The effects of the present application will be described below using data when the speaker SP
according to the above-described embodiment is prototyped and measured.
[0025]
3 and 4 show the measurement results when the frequency characteristics in the frequency
range of 50 Hz to 40 000 Hz were measured by the speaker SP attached with the auxiliary
diaphragm 10. FIG. 5 shows the speaker SP without the attached auxiliary diaphragm as a
control. Shows the measurement results of the frequency characteristics of
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Further, the difference between FIG. 3 and FIG. 4 is the difference in size of the diaphragm
portion of the auxiliary diaphragm 10, and the auxiliary diaphragm 10a used in FIG. 3 has an
edge portion 8 as shown in FIG. While the sub-diaphragm 10 used in FIG. 4 covers the curved
portion of the edge portion and further extends to the outside, as shown in FIG. It is.
[0026]
(Measurement Results) As can be seen from FIG. 5, in the conventional speaker SP without the
sub-diaphragm, a drop (peak dip) in the sound pressure level is observed in the range of 9000 Hz
to 13000 Hz.
Although the decrease in the overall sound pressure level in this region is also seen in FIG. 3, it
can be seen in FIG. 4 that the sound pressure level in this region is large.
That is, it can be seen that when the diaphragm portion of the sub-diaphragm 10 is large, a
sound pressure level is generated to compensate for the peak dip.
[0027]
The above embodiment has the following effects. Since the sub-diaphragm 10 is attached to a
position where the resonance is suppressed when the diaphragm 7 and the edge portion 8
resonate, the vibration energy due to the resonance is absorbed and the sub-diaphragm 10
efficiently compensates for the peak-dip. be able to. In particular, in the case of natural vibration
corresponding to one-end fixed secondary resonance, the attachment point between the outer
edge of the diaphragm 7 and the edge portion 8 becomes an antinode of the amplitude (see FIG.
1 (c)). By attaching 10, the secondary diaphragm 10 can efficiently compensate for the peak-dip
by absorbing vibration energy due to resonance. Since the sub-diaphragm 10 vibrates in a
frequency range in which the diaphragm 7 and the edge portion 8 resonate, the sub-diaphragm
10 can emit a sound pressure level that compensates for peak-dip. Therefore, it is possible to
provide a speaker device in which the continuity of the sound pressure level is secured. When
the sub-diaphragm 10 having a large diaphragm portion is attached, a sound pressure level is
generated to compensate for peak dip. Since the diaphragm portion of the sub-diaphragm 10
extends from the mounting position toward the outer periphery of the diaphragm 7, the sound
emitted from the diaphragm 7 is not impeded. Since the auxiliary diaphragm 10 is disposed in
front of the speaker SP, the sound emitted by the auxiliary diaphragm 10 can be efficiently
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emitted to the outside without being blocked by the edge portion 8.
[0028]
The embodiment of the present application is not limited to the above, and may be modified as
follows, for example. The diaphragm 7 and the edge portion 8 do not have to be separately
manufactured, and may be integrally formed (FIG. 7). Further, the diaphragm 7 and the auxiliary
diaphragm 10 do not have to be manufactured separately, and may be formed integrally (FIG. 8).
By reducing the number of parts, it is possible to reduce the part management cost and the
production operation cost at the time of manufacturing the speaker SP.
[0029]
FIG. 1 is a schematic view showing a state of vibration at an edge portion. FIG. 2 is a crosssectional view of the speaker SP according to the embodiment of the present application. FIG. 3
shows measurement results when the speaker SP according to the embodiment is prototyped and
the frequency characteristic is measured. FIG. 4 shows measurement results when the speaker SP
according to the embodiment is prototyped and the frequency characteristic is measured. FIG. 5
shows the measurement results of frequency characteristics of the conventional speaker SP. FIG.
6 is a cross-sectional view showing the shape of the sub-diaphragm when the speaker SP
according to the embodiment is prototyped and measured. FIG. 7 is a view showing a
modification of the embodiment of the present application. FIG. 8 is a view showing a
modification of the embodiment of the present application.
Explanation of sign
[0030]
SP: Speaker 7: Diaphragm 8: Edge 9: Frame 10: Sub-diaphragm
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