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JP2010278692

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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 JP2010278692
The present invention provides a speaker diffuser which can be mounted on a speaker unit for
high sound with high directivity to improve directivity, is easy to adjust the directivity, and does
not deteriorate sound quality, and a speaker unit including the same. A speaker unit is provided
with a diaphragm and a diffuser, and the diffuser has a diffuser main body disposed opposite to a
central portion of the diaphragm. On the surface of the diffuser body 61 facing the diaphragm 5,
the sheet member 8 has a propagation speed of the sound wave higher than the propagation
speed of the sound wave of the diffuser body 61 and a smaller internal loss than the internal loss
of the diffuser body 61. It is attached. [Selected figure] Figure 2
Speaker diffuser and speaker unit with diffuser
[0001]
The present invention relates to a diffuser used to flatten the frequency characteristics of a
speaker and to improve directivity, and to a speaker unit provided with such a diffuser.
[0002]
Conventionally, for the purpose of flattening the frequency characteristics of a speaker or
improving the directivity, it is generally widely practiced to dispose a diffuser opposite to a
diaphragm (for example, Patent Document 1).
[0003]
Unexamined-Japanese-Patent No. 1-256898
01-05-2019
1
[0004]
However, in the conventional diffuser, although the improvement effect on the flattening and
directivity of the frequency characteristic is obtained to some extent, there is room for
improvement on the spread of sound in the high region (high directivity).
[0005]
In particular, in the conventional diffuser, since plastic is widely used from the viewpoint of
formability, there is a problem that the spread of the sound in the high region is scarce and the
feeling of the sound field is lacking.
[0006]
In order to widen the sound in the high range, the diffuser may be formed using a metal material
having a high acoustic wave propagation speed and a small internal loss, but integrally forming a
diffuser having a complicated shape from the metal material is difficult and expensive In
addition, in the case of a diffuser made only of metal-based materials, only the high range may be
emphasized or reverberation may occur, which may affect the faithful reproduction.
In addition, since the shape and the distance to the diaphragm are greatly related to the acoustic
characteristic by the diffuser, it is extremely difficult to adjust or control the acoustic
characteristic by the diffuser formed in the predetermined shape later. It becomes.
[0007]
Although the amplifier connected to the speaker unit is provided with an equalizer circuit for
adjusting frequency characteristics, directivity can not be adjusted by electrical signal processing
by the equalizer circuit.
[0008]
The present invention has been made in view of the above circumstances, and an object thereof
is to be mounted on a speaker unit with high directivity to improve directivity and to be easy to
control and adjust directivity, A speaker diffuser which does not deteriorate the speaker and a
speaker unit provided with the same.
01-05-2019
2
[0009]
In order to achieve the above object, the speaker diffuser 6 according to the present invention
has a first sound wave propagation velocity and a first internal loss, and is disposed to face the
central portion of the diaphragm 5. And the second acoustic wave propagation velocity higher
than the first acoustic wave propagation velocity and the second internal loss smaller than the
first internal loss, and the diffuser main body 61 And a sheet member 8 attached to the opposite
surface.
[0010]
Furthermore, the speaker unit with a diffuser according to the present invention includes: a
diaphragm 5; a diffuser main body having a first sound wave propagation speed and a first
internal loss, and disposed to face the center of the diaphragm 5 61, a diffuser 6 having a second
sound transmission speed higher than the first sound transmission speed, and a second internal
loss smaller than the first internal loss; And a sheet member 8 attached to the surface facing the
diaphragm 5.
[0011]
In addition, the diffuser main body 61 is made of synthetic resin, and the sheet member 8 is
made of metal.
[0012]
Further, the sheet member 8 is in the form of a strip passing through the central portion of the
diffuser main body 61 or having a plurality of projecting pieces 82 radially extending from the
inner peripheral portion to the outer peripheral portion of the diffuser main body 61. It is
characterized by
[0013]
According to the defiser according to the present invention and the speaker unit provided with
the same, the diffuser main body is disposed opposite to the central portion of the diaphragm,
and the diffuser main body is opposed to the diaphragm in a surface opposite to the diffuser
main body. Since a sheet member having a high propagation speed and a small internal loss is
attached, the diffuser main body suppresses the reverberation and resonance sound due to the
resonance of the sheet member and the interaction between the diffuser main body and the sheet
member makes the high region a high sound pressure. Can be widely spread.
[0014]
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Further, since the sheet member is separately attached to the diffuser main body, the directivity
characteristic of the speaker can be easily adjusted and controlled only by replacing the sheet
member with one having a different shape.
[0015]
In addition, when the diffuser main body is made of a synthetic resin, it can be formed at low cost
and can be easily formed into a complicated shape, and a metallic sheet member attached to this
can be reproduced to clear high noise.
[0016]
Furthermore, since the belt-like sheet member passing through the central portion of the diffuser
main body, or the sheet member having a plurality of projecting portions radially extending from
the inner peripheral portion to the outer peripheral portion of the diffuser main body, the
diffuser body is not entirely covered. The high-pitched range may be overemphasized, or the
generation of abnormal noise due to reverberation may be suppressed, and the sound may be
diffused in the longitudinal direction of the sheet member itself or in the extension direction of
the projection. Can expand the sound field space of the
[0017]
1 is a front view showing a speaker unit with a diffuser according to an embodiment of the
present invention, a sectional view taken along the line XX in FIG. 1 an exploded perspective view
showing a mounting portion of the diffuser, an enlarged sectional view showing a diffuser
according to an embodiment of the present invention The bottom view which looked at a diffuser
from the back side One embodiment of the present invention, and an explanatory view showing
the modification of the graph sheet member which shows the directivity pattern of the speaker
with a conventional diffuser
[0018]
Hereinafter, an embodiment of the present invention will be described in detail based on the
drawings.
First, referring to FIG. 1 and FIG. 2, an embodiment of a loudspeaker unit with a diffuser
according to the present invention will be described. The loudspeaker unit is an electrodynamic
(dynamic) tweeter.
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4
Reference numeral 1 denotes a frame of the speaker unit, and a magnetic circuit 2 (external
magnet type in the illustrated example) is attached to the frame 1 as shown in FIG.
[0019]
The magnetic circuit 2 is mounted on a ring-shaped magnet 21 magnetized in the thickness
direction, a ring-shaped top plate 22 mounted on one of the magnetic poles of the magnet 21,
and the other magnetic pole of the magnet 21. And a pole piece 24 provided at the center of the
back plate 23. A magnetic gap G in which the magnetic flux of the magnet 21 acts is formed
between the pole piece 24 and the top plate 22. It is done.
[0020]
The top plate 22, the back plate 23, and the pole piece 24 become a yoke for collecting the
magnetic flux of the magnet 21 in the magnetic gap G, and the voice coil 3 is inserted in the
magnetic gap G.
The back plate 23 and the pole piece 24 may be integrally formed.
[0021]
The voice coil 3 is formed by winding a conductive wire such as copper or aluminum coated with
an insulating film around the outer periphery of a non-conductive (a conductive nonmagnetic
material such as aluminum may be used) made of paper or the like. The end of the pole piece 24
is inserted into the inner periphery of the wire portion 32, and the inner peripheral surface of the
top plate 22 faces the winding portion 32 of the outer periphery.
The voice coil 3 is attached to the frame 1 via the damper 4 and supported movably in the frontrear direction (the direction of the axis passing through the center of the voice coil 3 and in the
vertical direction in FIG. 2) by the damper 4 Its tip is joined to the dome-shaped diaphragm 5.
[0022]
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5
The diaphragm 5 is a dome-shaped radiator formed of paper, wood, or a synthetic resin such as
polypropylene or polyester, aluminum or other metal, or chemical fiber, as is apparent from FIG.
The voice coil 3 is placed on the tip of the voice coil 3 so as to face the tip surface of the voice
coil 3.
[0023]
Then, according to the speaker unit configured as described above, it is known that the voice
current flows in the voice coil 3 (precisely, the winding portion 32) orthogonal to the magnetic
lines of the direct current magnetic field generated in the magnetic gap G. Thus, the voice coil 3
vibrates by obtaining an oscillating force in the axial direction, and the vibration is converted to
air vibration through the diaphragm 5 so that sound can be reproduced.
[0024]
The dome-shaped diaphragm 5 has a good sound spread because the air vibration in front of it
becomes a spherical wave, and is suitable for the reproduction of high-pitched high-pitched
sound, but the vibration energy is widely diffused. The sound pressure level at a certain point is
lowered, and as a result, the directivity characteristic as seen from the sound pressure level is not
necessarily good.
[0025]
Therefore, as shown in FIGS. 1 and 2, a diffuser 6 (acoustic equalizer) is provided in front of the
diaphragm 5 (on the side opposite to the magnetic circuit).
The diffuser 6 is formed by integrally forming a disk-like diffuser main body 61 curved along the
diaphragm 5 in a tertiary curved shape and a pair of support legs 62 for supporting the diffuser
main body 61.
The diffuser main body 61 is disposed opposite to the central portion of the diaphragm 5, and
the support leg 62 straddles the diaphragm 5, and has foot portions 62a for fixing to the frame 1
at each lower end thereof.
[0026]
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6
As shown in FIG. 3, the foot portion 62a has a two-step cylindrical shape, and the frame 1 is
formed with a foot portion 62a and a keyhole concave portion 1a into which a connecting
portion between the foot portion 62a and the support leg 62 is fitted. There is.
Reference numeral 7 denotes a metal cover ring attached to the frame 1. The cover ring 7
functions as a decorative plate that shields the foot portion 62a of the diffuser 6, and fixes the
diffuser 6 in a fixed position of the frame 1. Play a role in preventing their falling out.
[0027]
Next, the configuration of the diffuser 6 will be described in more detail with reference to FIG. 4
and FIG. 5. The diffuser 6 is an integral molding made of synthetic resin such as acrylic resin,
polystyrene resin or ABS resin. A sheet member 8 having a material different from that of the
diffuser main body 61 is attached and fixed to the surface 2 facing the diaphragm 5 shown in
FIG.
A member (for example, aluminum) in which the propagation velocity (hereinafter referred to as
the velocity of sound) of the sound wave possessed by the sheet member 8 is higher than the
velocity of sound possessed by the diffuser main body 61 and the internal loss is smaller than the
internal loss possessed by the diffuser main body 61. It consists of a fixed metal sheet (10
micrometers-1000 micrometers in thickness), such as copper and titanium.
[0028]
Sound velocity (Young's modulus E / square root of density ρ) and internal loss (tan δ) are
indexes to evaluate the acoustic performance, and although synthetic resins differ depending on
the material, the sound velocity is generally 1000 to 3000 m / s, internal loss It is about 0.02 to
0.08.
In addition, aluminum (sonic velocity 5114 m / s, internal loss 0.002), copper (sonic velocity
3800 m / s, internal loss 0.001), and titanium as members having higher sound velocity and
lower internal loss than the synthetic resin as described above, and titanium Other than metal
systems such as (sound velocity 5145 m / s, internal loss 0.003), wood-based materials such as
01-05-2019
7
China (sonic velocity 4896 m / s, internal loss 0.019) and the like can be mentioned.
[0029]
Here, the diffuser 6 is not limited to integral molding from synthetic resin, but may be integrally
molded from materials other than synthetic resin.
Even in that case, in view of the above conditions, the sheet member 8 is selected to be a member
having a higher sound velocity and a lower internal loss than the defiser main body 61.
[0030]
Further, the sheet member 8 is not limited to metal, and may be formed of materials other than
metal.
Even in that case, in light of the above conditions, a member (for example, a wood sheet) having a
higher sound velocity and a lower internal loss than the defiser main body 61 is selected.
In addition, the sheet member 8 may be configured to cover the entire back surface of the
diffuser main body 61, but partially covers the back surface of the diffuser main body 61 as
shown in FIG. It is preferable to use a form.
[0031]
In FIG. 5, in the sheet member 8, a plurality of (four in the illustrated example) projecting piece
portions 82 are connected to the outer periphery of the annular portion 81 concentric with the
diffuser main body 61, and each projecting piece portion 82 is the inner periphery of the diffuser
main body 61 It is set as the form which spreads radially toward a peripheral part from a part.
[0032]
Then, according to the diffuser 6 in which the sheet member 8 as described above is attached
and fixed to the diffuser main body 61, the diffuser main body 61 and the sheet member 8 are
suppressed while suppressing reverberation and resonance noise due to resonance of the sheet
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8
member 8 by the diffuser main body 61. The interaction can spread the sound in the high region,
and in particular, diffuse the sound around the extension direction of the projecting portion 82
(in the diagonally upward and downward direction in the illustrated example) by the acoustic
anisotropy generated by the attachment of the sheet member 8 It is possible to expand the high
sound field space.
[0033]
FIG. 6 shows a directivity pattern in the horizontal direction when a diffuser according to the
present embodiment and a conventional diffuser are mounted on the same speaker unit, and an
audio signal of 17 kHz is input to these speaker units.
In FIG. 6, the solid line indicates the directivity pattern of the loudspeaker unit with a diffuser
according to the present embodiment, and the dashed-dotted line indicates the directivity pattern
of the conventional loudspeaker unit with a diffuser.
Also, a conventional diffuser is an integrally molded article made of acrylic resin, and an
aluminum sheet member 8 (thickness 100 μ) having a form as shown in FIG. 5 is attached to the
diffuser (the back surface of the disk-like diffuser main body). Is a diffuser according to the
present embodiment.
[0034]
As apparent from FIG. 6, the speaker with diffuser according to the present embodiment has an
improved sound pressure level in almost all directions as compared to the conventional speaker
with diffuser, and in particular, the rear (120 to 160 degrees and 210 A large improvement in
sound pressure level can be seen in the range of -250 degrees.
Thereby, according to the diffuser 6 which concerns on this Embodiment, it turns out that it has
a big improvement effect in the directivity characteristic in a high sound range.
[0035]
The preferred embodiments of the present invention have been described above, but the present
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9
invention is not limited to dome-shaped speakers, and can be applied to flat speakers and coneshaped speakers.
[0036]
Furthermore, the sheet member 8 is not limited to the form as shown in FIG. 5, but may be as
shown in FIGS. 7 (a) to 7 (j).
Each of the sheet members 8 in (a) to (f) has a projecting portion 82 that radially spreads from
the inner peripheral portion to the outer peripheral portion of the diffuser main body 61, and (a)
is shown in FIG. The annular portion 81 of the seat member 8 shown in FIG. 8 is a circular
portion 83 without a central hole, (b) is the one in which the direction of the projecting piece 82
with respect to the support leg 62 of the diffuser is changed, (c) and (d) are In the modified
example of the center hole of the annular portion 81, (e) and (f) do not have the annular portion
81 and the projecting piece portion 82 is directly connected at the center of the diffuser main
body 61.
Further, the sheet member 8 of (g) to (j) is in the form of a band passing through the central
portion of the diffuser main body 61.
[0037]
5 diaphragm 6 diffuser 61 diffuser main body 8 sheet member 81 annular portion 82 projecting
piece portion
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