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JP2011041217

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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 JP2011041217
An object of the present invention is to provide a speaker edge capable of suppressing resonance
despite its simple structure and easy manufacture. A roll edge (17) comprises a recess (17A)
having an arc-shaped cross section and a holding portion (17B) having a flat cross-section. The
holding portion 17B is supported in a state in which the annular packing 20 disposed on the top
of the yoke 11B and the outer peripheral portion thereof are sandwiched by the frame 19. A
foam member 18 is attached to the roll edge 17 so as to fill the entire recess 17A. The foam
member 18 may have a semi-annular molded product attached or may be filled with a foam
material. As the foam member 18, an elastic body having a density lower than that of the roll
edge 17 such as urethane foam or rubber is used to resist deformation of the recess 17A and to
reduce weight and improve regeneration characteristics. By providing the foam member 18, the
resonance of the roll edge 17 can be suppressed, and the reproduction characteristic of the
speaker unit can be improved. [Selected figure] Figure 2
Speaker edge
[0001]
The present invention relates to a speaker edge provided around a diaphragm of a speaker.
[0002]
Generally, in the speaker, the outer periphery of the diaphragm and the speaker frame are
connected at an edge.
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The edge holds the loudspeaker diaphragm in the correct position and prevents lateral
movement of the diaphragm without disturbing the movement of the diaphragm. The material of
the edge is preferably light in weight, good in conformity, and rigid against lateral vibration of
the diaphragm. For example, urethane, rubber, cloth or the like is used.
[0003]
When the diaphragm vibrates, the edge may cause resonance at a certain frequency. When the
edge resonates, a sound different from the target reproduction sound is generated or the target
reproduction sound is attenuated to reproduce the speaker. Since the characteristics deteriorate,
it is necessary to suppress the resonance.
[0004]
Heretofore, there have been the following measures for suppressing the edge resonance.
For example, two or more kinds of materials having different physical properties are arranged in
parallel in the same plane to form an edge, thereby dispersing the resonance point of the edge
and suppressing the peak dip generated in the middle and high range. (See Patent Document 1).
[0005]
JP, 2008-60751, A
[0006]
If the edge is processed as in the invention described in Patent Document 1, the resonance can
be suppressed to some extent, but if the thickness of the edge is increased to suppress the
resonance of the edge, the edge becomes heavy and the efficiency of the speaker (reproduction
characteristic) When the edge is made thinner, there is a problem that resonance tends to occur.
[0007]
Then, an object of this invention is to provide the edge for speakers which can suppress
resonance, without processing edge itself or changing thickness.
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[0008]
The present invention has the following configuration as means for solving the above-mentioned
problems.
[0009]
The speaker edge of the present invention is attached between the outer periphery of the
diaphragm and the frame, and has a lower density than the member used for the recess in the
recess of the recess formed along the outer periphery of the diaphragm. The parts are filled.
[0010]
Since the member is filled in the recess of the recess of the speaker edge, the deformation of the
recess due to the resonance of the edge is suppressed by the filled member when the diaphragm
is vibrated.
Therefore, the resonance component of the edge is suppressed, and the reproduction
characteristic of the speaker can be improved.
In addition, since the member is only filled in the recess of the recessed portion of the edge, the
manufacturing is easy without processing the edge itself or changing the thickness.
Furthermore, as a member to be filled in the recess of the recess, a member having a density
lower than that of the recess is used.
Thereby, the increase in weight of the edge can be suppressed, and the edge can be kept
lightweight.
[0011]
In the above invention, a member having a density lower than that of the member used for the
recess is filled in the entire recess of the recess.
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With this configuration, deformation of the recess at the time of resonance of the edge can be
suppressed in the entire recess. Therefore, the resonance component of the edge is suppressed,
and the reproduction characteristics of the speaker can be further improved.
[0012]
In the above invention, the recess of the recess is filled with the foam member as a low density
member. The foam member contains a plurality of cells, which can reduce the overall weight of
the edge. In addition, since the air bubbles play the role of a buffer, it is possible to suppress the
deformation of the edge. Therefore, the component of the resonance of the diaphragm is
suppressed, and the reproduction characteristic of the speaker device can be improved.
[0013]
According to the present invention, when the diaphragm vibrates, the edge resonance can be
suppressed without processing the edge itself or changing the thickness, and the reproduction
characteristics of the speaker unit can be improved.
[0014]
(A) is a cross-sectional view of a dome-shaped speaker provided with a roll edge according to an
embodiment of the present invention, (B) is a diaphragm, a roll edge, and a foam member (in
dotted line in (A)) integrally configured. It is a rear view of the enclosed portion).
(A)-(C) are cross-sectional enlarged views which show the state at the time of the stillness of the
dome-type speaker which concerns on embodiment of this invention, and vibration. It is a graph
showing the reproduction | regeneration characteristic of the conventional dome shaped speaker
and the dome shaped speaker which concerns on embodiment of this invention. It is sectional
drawing of the cone-type speaker provided with the roll edge which concerns on embodiment of
this invention.
[0015]
Hereinafter, a case where a roll edge which is an example of a speaker edge according to an
embodiment of the present invention is applied to a dome-shaped speaker will be described as an
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example.
[0016]
As shown in FIG. 1A, the speaker unit 1 is a dome-shaped speaker, and includes a yoke 11A, a
yoke 11B, a magnet 12, a plate 13, a bobbin 14, a voice coil 15, a diaphragm 16, a roll edge 17,
and a foam member. 18, a frame 19 and a packing 20 are provided.
[0017]
The yoke 11A, the yoke 11B, the magnet 12, and the plate 13 constitute a magnetic circuit 10.
In the magnetic circuit 10, the voice coil 15 is inserted in the magnetic gap S provided between
the outer peripheral portion of the plate 13 and the inner peripheral portion of the yoke 11B.
The voice coil 15 is wound around a bobbin 14, and the bobbin 14 is connected at its end to the
boundary between the diaphragm 16 and the roll edge 17.
[0018]
The diaphragm 16 is formed in a dome shape, and the roll edge 17 is connected to the outer
peripheral portion. The diaphragm 16 vibrates in response to an audio signal input from the
outside to generate a sound wave.
[0019]
The roll edge 17 is formed along the outer peripheral portion of the diaphragm 16 and includes
a recess 17A having an arc-shaped cross section and a holding portion 17B having a flat crosssection. The inner peripheral portion of the recess 17A is connected to the diaphragm 16, and
the holding portion 17B is provided on the outer peripheral portion of the recess 17A. For the
roll edge 17, a cloth impregnated with a resin and coated with rubber is used. In addition, it is
also possible to use urethane foam etc. for the roll edge 17. The holding portion 17B is supported
in a state of being sandwiched by the annular packing 20 disposed on the upper portion of the
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yoke 11B and the frame 19.
[0020]
The frame 19 is disposed to face the outer peripheral portion of the diaphragm 16.
[0021]
As shown in FIG. 1A and FIG. 1B, the foam member 18 is filled in the recess 17 A of the roll edge
17.
Although urethane foam is used for the foam member 18 as an elastic body having a density
lower than that of the roll edge, it is also possible to use foam rubber, polyethylene foam, or the
like having a density lower than that of the roll edge 17.
[0022]
In the concave portion 17A of the roll edge 17, the foam member 18 previously formed into a
semi-annular body is fixed with an adhesive or the like. Although the foam member 18 is
preferably filled over the entire recess 17A, a part of the recess 17A is filled with the foam
member 18, and a cable or the like of the voice coil 15 is allowed to pass through the unfilled
portion of the foam member 18. Is also possible. As described above, since it is sufficient to fill
the recess of the concave portion 17A of the roll edge 17 with the foam member 18, the edge
itself can be easily manufactured without processing or changing the thickness.
[0023]
Next, the state of the speaker unit 1 will be described based on FIG. 2A shows the time when the
speaker unit 1 is at rest, and FIGS. 2B and 2C show the vibration of the diaphragm 16 in a
resonant state. 2 (B) and 2 (C), the diaphragm and the edge at the time of stationary shown in
FIG. 2 (A) are shown by dotted lines.
[0024]
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When the foam member 18 is provided on the back surface of the recess 17A of the roll edge 17,
as shown in FIGS. 2B and 2C, the foam member 18 suppresses the deformation of the recess 17A
in the lateral direction in FIG. Be done. That is, when resonance of the diaphragm 16 is
generated, as shown in FIG. 2B, when the recess 17A vibrates (moves) upward when the
diaphragm 16 vibrates (moves) in the downward direction in FIG. A force is applied to the recess
17A in a direction to narrow the width. However, since the foam member 18 filled in the entire
recess 17A resists this force, the recess 17A and the foam member 18 slightly bend, but the
resonance component is suppressed.
[0025]
Further, as shown in FIG. 2C, when the concave portion 17A vibrates (moves) downward when
the diaphragm 16 vibrates (moves) in the upper direction in the figure, a direction in which the
width expands in the concave portion 17A. Power to transform into However, since the foam
member 18 filled in the entire recess 17A resists this force, the recess 17A and the foam member
18 slightly bend but the resonance component is suppressed.
[0026]
Since the foam member 18 operates as described above, the resonance of the roll edge 17 can be
suppressed when the diaphragm 16 vibrates. As a result, when the diaphragm 16 vibrates, the
roll edge 17 resonates, so that it is possible to suppress the generation of a sound different from
the target reproduction sound, and the reproduction characteristic of the speaker unit is not
adversely affected.
[0027]
When the same member as the roll edge 17 or a member having a density higher than that of the
roll edge 17 is used as the foam member 18, the weight of the roll edge 17 is heavy, and the
vertical movement of the diaphragm 16 is deteriorated. Therefore, the reproduction
characteristic of the speaker unit 1 is deteriorated. Therefore, in the present invention, in order
to reduce the weight of the foam member 18 itself and suppress the deterioration of the
reproduction characteristics of the speaker unit 1, an elastic body having a density lower than
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that of the roll edge 17 is used as the foam member 18.
[0028]
The effect of filling the roll edge 17 with the foam member 18 will be described below based on
FIG. FIG. 3 shows sound pressure characteristics and impedance characteristics of the speaker
when the foam member 18 is attached to the back surface of the recess 17A of the roll edge 17
and when the foam member 18 is not attached to the recess 17A. As shown in FIG. 3, in the case
of the conventional speaker unit without the foam member 18, a peak of resonance appears at
around 5 kHz. On the other hand, in the speaker unit 1, the peak of the resonance appearing
around about 5 kHz is suppressed by about 10 dB. Also in the impedance characteristic, a peak
occurs at about 5 kHz in the conventional speaker unit, but no peak occurs at about 5 kHz in the
speaker unit 1.
[0029]
As described above, by providing the foam member 18 in the recess 17A of the roll edge 17, the
resonance of the roll edge 17 is suppressed without processing the edge itself or changing the
thickness, and the reproduction characteristic of the speaker unit can be improved. It can be
improved.
[0030]
In FIG. 3, the sound pressure characteristic of the speaker unit when using the roll edge
according to the embodiment of the present invention at 20 Hz to 3 kHz is the foam member 18
as described above as a member to be filled in the recess of the recess 17A. Therefore, the
decrease in sound pressure characteristics is minimized.
If the same member as the member used for the recess 17 or a high density member is used as a
member for filling the recess of the recess 17, the sound pressure characteristic of the speaker
unit is greatly reduced.
[0031]
Next, the roll edge according to the embodiment of the present invention is not only applied to
the dome-shaped speaker, but is naturally applicable to other speakers using the roll edge.
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[0032]
For example, when it applies to a cone type speaker, it will become as shown in FIG.
As shown in FIG. 4, the speaker unit 2 is a cone type speaker, and includes a yoke 31 A, a yoke
31 B, a magnet 32, a bobbin 34, a voice coil 35, a diaphragm 36, a roll edge 37, a foam member
38, a frame 39, a damper 40 and dust cap 41 are provided.
[0033]
The yoke 31A, the yoke 31B, and the magnet 32 constitute a magnetic circuit 30. In the magnetic
circuit 30, the voice coil 35 is inserted in the magnetic gap S provided between the outer
periphery of the pole of the yoke 31A and the inner periphery of the yoke 31B. The voice coil 35
is wound around a bobbin 34, and the bobbin 34 is connected at the end to the boundary
between the diaphragm 36 and the roll edge 37.
[0034]
The diaphragm 36 is formed in a cone shape, and the roll edge 37 is connected to the outer
peripheral portion.
[0035]
The roll edge 37 includes a recess 37A having an arc-shaped cross section and a holding portion
37B having a flat cross section, the inner peripheral portion of the recess 37A is connected to the
diaphragm 36, and the holding portion 37B is provided on the outer periphery of the recess 37A.
ing.
The holding portion 37B is attached to the frame 39. The damper 40 is connected to the bobbin
34 and the frame 39. The outer periphery of the dust cap 41 is connected to the diaphragm 36
and covers the upper opening of the bobbin 34.
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[0036]
In the case of the cone type speaker, as in the dome type speaker, the diaphragm resonates when
it vibrates. Therefore, in the speaker unit 2, as in the speaker unit 1, the back surface of the
concave portion 37 </ b> A of the roll edge 37 is filled with the foam member 38.
[0037]
Thus, as with the dome-shaped speaker, the resonance of the roll edge 37 can be suppressed, and
the reproduction characteristics of the speaker unit 2 can be improved.
[0038]
The present invention is not limited to the dome-shaped speaker and the cone-shaped speaker,
and can be applied to general speakers using roll edges.
[0039]
Further, the present invention is not limited to the roll edge, but can be applied to other edges
having a recess.
For example, V edge, corrugation edge, multiple half roll cross edge, accordion pleat cross edge,
one piece fixed edge, etc.
The present invention is also applicable to a fixed edge obtained by integrally molding the
diaphragm and the edge with the same material, or to a free edge having the edge bonded to the
outer peripheral portion of the diaphragm.
[0040]
1, 2 Speaker unit 10 30, magnetic circuit 11A, 11B, 31A, 31B Yoke 12, 32 Magnet 13 plate 14,
34 Bobbin 15, 35 Voice coil 16, 36 Diaphragm 17, 37 Roll edge 17A, 37A ... Recess 17B, 37B ...
Holding part 18, 38 ... Foamed member 19, 39 ... Frame 20 ... Packing 40 ... Damper 41 ... Dust
cap
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