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JP2002095086

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002095086
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit. More particularly, the present invention relates to a speaker unit with suppressed
resonance and excellent sound quality.
[0002]
2. Description of the Related Art First, a conventional speaker unit will be described. FIG. 9 is a
schematic cross-sectional view showing the configuration of a conventional speaker unit. The
speaker unit 101 includes a magnetic circuit 102, a voice coil 103 disposed in a magnetic gap of
the magnetic circuit 102, a damper 104 supporting the voice coil 103, and a diaphragm 105
attached to an upper end of the voice coil 103. An edge 106 coupled to the diaphragm 105 and a
dust cap 107 fixed to a central portion of the upper surface of the diaphragm 105 are provided.
The magnetic circuit 102 includes a bottom plate 108, a magnet 109, a top plate 110, and a
frame 111. An edge 106 is fixed to the frame 111.
[0003]
In the conventional speaker unit 101, the diaphragm 105, the edge 106, the voice coil (voice coil
bobbin) 103 or the dust cap 107 are bonded together by an adhesive. The dust cap 107 may be
fixed to the voice coil (voice coil bobbin) 103 in this case as well, but in this case, the dust cap
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107 and the voice coil (voice coil bobbin) 103 are fixed by bonding with an adhesive.
[0004]
In addition, the edge 106 and the frame 111 are often fixed via a reinforcing arrow 112 in order
to improve strength and prevent deformation.
[0005]
However, in the conventional speaker unit, only the consideration for improving the strength of
the joint portion of each component is taken, and no consideration is given to the sound quality. .
Since the diaphragm 105, the edge 106, the voice coil 103, the dust cap 107, the frame 111, and
the reinforcing arrow 112 are made of different materials, undesired reflections and vibration
propagation losses are caused in the respective coupling portions when the speaker is driven.
Occur. As a result, there is a problem that an unwanted resonance is caused to the diaphragm or
the voice coil to deteriorate the sound quality of the reproduced sound, or the vibration of the
voice coil is not sufficiently transmitted to the diaphragm.
[0006]
The present invention has been made to solve the above-mentioned conventional problems, and
an object of the present invention is to provide a speaker unit which has excellent resonance and
suppressed resonance.
[0007]
SUMMARY OF THE INVENTION A speaker unit according to the present invention comprises a
frame, a magnetic circuit, a voice coil, a diaphragm, an edge, and a dust cap, and the edge is a
portion of the frame. The intermediate member is fixed to the peripheral portion through an
intermediate member, and the intermediate member is constituted of a plurality of
circumferentially divided portions, at least one of the plurality of portions having vibration
propagation characteristics different from those of the other portions. Have.
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2
Another speaker unit of the present invention comprises a frame, a magnetic circuit, a voice coil,
a diaphragm, an edge, and a dust cap, and the edge is fixed to the outer peripheral portion of the
diaphragm via an intermediate member. The intermediate member is composed of a plurality of
circumferentially divided portions, at least one of the plurality of portions having vibration
propagation characteristics different from those of the other portions. Still another speaker unit
of the present invention comprises a frame, a magnetic circuit, a voice coil, a diaphragm, an edge,
and a dust cap, which is the upper end of the voice coil or the diaphragm. The intermediate
member is fixed to the upper surface center portion via an intermediate member, and the
intermediate member is constituted of a plurality of circumferentially divided portions, and at
least one of the plurality of portions is different from other portions in vibration propagation
characteristics. Have. Still another speaker unit of the present invention includes a frame, a
magnetic circuit, a voice coil, a diaphragm, an edge, and a dust cap, and the voice coil includes an
intermediate member on the inner periphery of the diaphragm. The intermediate member is fixed
with the intermediate member being composed of a plurality of circumferentially divided
portions, and at least one of the plurality of portions has vibration propagation characteristics
different from those of the other portions. In a preferred embodiment, at least one of the plurality
of portions is made of a material different from the other portions. In a further preferred
embodiment, at least one of the plurality of portions is formed of a cork sheet. In another
preferred embodiment, at least one of the plurality of portions has a thickness different from the
other portions. In yet another preferred embodiment, at least one of the plurality of portions has
a radial width different from the other portions.
[0008]
The operation of the present invention will be described below. According to the present
invention, by appropriately arranging an intermediate member including a plurality of portions
having different vibration propagation characteristics in the fixing portion of each component of
the speaker unit, resonance is suppressed and a speaker unit having excellent sound quality You
can get Conventionally, it has been known to dispose an annular member having a mechanical
impedance between the diaphragm and the edge between each component of the speaker unit
(for example, between the diaphragm and the edge). However, such techniques only consider
suppressing the reflection of longitudinal waves (waves in the traveling direction). On the other
hand, in actual speakers, propagation of bending waves is considered more important than
longitudinal waves. Therefore, in the present invention, reflection of bending waves is
appropriately performed by appropriately arranging portions having different vibration
propagation characteristics (materials, shapes (for example, widths in the radial direction) and /
or portions having different thicknesses) in the circumferential direction of members. Is
suppressed as a whole to suppress resonance. That is, as long as each component is made of a
different material, it is impossible to eliminate all reflections, so in the present invention the
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bending wave reflection is changed by changing the vibration propagation velocity at the desired
part. Cancel or disperse to suppress resonance. As a result, a speaker unit with excellent sound
quality can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION Preferred embodiments of the present invention
will be described below with reference to the drawings, but the present invention is not limited to
these embodiments.
[0010]
FIG. 1 is a schematic cross-sectional view showing the structure of a speaker unit according to a
preferred embodiment of the present invention.
The speaker unit 1 includes a magnetic circuit 2, a voice coil 3 disposed in a magnetic gap of the
magnetic circuit 2, a damper 4 supporting the voice coil 3, and a diaphragm 5 attached to the
upper end of the voice coil 3. An edge 6 coupled to the diaphragm 5 and a dust cap 7 fixed to a
central portion of the upper surface of the diaphragm 5 are provided. The magnetic circuit 2
includes a bottom plate 8, a magnet 9, a top plate 10, and a frame 11. An edge 6 is fixed to a
peripheral portion of the frame 11 via an intermediate member 20.
[0011]
The intermediate member 20 has a shape (typically, a ring shape) which can be placed on the
peripheral portion of the frame 11. Furthermore, as shown in FIG. 2, the intermediate member
20 is comprised from several part 21a, 21b, 21c ... which was divided | segmented into the
circumferential direction. At least one of the plurality of divided parts has vibration propagation
characteristics (vibration propagation speed) different from those of the other parts. For example,
different vibration propagation characteristics can be provided by configuring the at least one
portion and the other portion with different materials. Materials used for the intermediate
member include cork sheet, resin, woven or non-woven fabric, paper, metal and rubber. These
materials may be used in any appropriate combination depending on the purpose and application
of the speaker unit. The combination of parts made of different materials may be a combination
of two types or a combination of three or more types. Typical combinations include cork / paper,
paper / resin, cork / resin. Particularly preferred combinations are paper / resin, cork / resin. By
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using such a combination, the reflection between the edge and the frame is particularly
effectively suppressed, and as a result, the resonance is particularly effectively suppressed, so
that a speaker unit having excellent sound quality can be obtained. . Although such an excellent
effect is not clear in theory, it can be considered to be caused by arranging a material having a
specific vibration propagation velocity in a specific positional relationship ("dissimilar material
arrangement" will be described below) To do).
[0012]
Intermediate member 20 is divided into any suitable number of portions (preferably 2 to 20,
more preferably 4 to 16). Furthermore, portions made of different materials are arranged in any
appropriate rule according to the purpose (it is an object to achieve the object of the present
invention that the at least one portion and the other portion are made of different materials).
Necessary and sufficient conditions). For example, when arranging the part consisting of material
A and the part consisting of material B, they may be arranged alternately like ABAB ..., every 3 or
4 every other one like AABA AB ..., AAAB ... Or they may be arranged in appropriate
combinations. Even when three or more types of materials are used, any appropriate
arrangement may be adopted depending on the purpose. Preferably, in the case where opposing
portions exist (that is, when divided into an even number of portions), the opposing portions are
made of different materials. This is also not clear in theory, but this is because resonance is
suppressed and a speaker unit having excellent sound quality can be obtained. The most
representative combination is one in which the intermediate member is divided into six in the
circumferential direction, and portions made of cork (or paper) and portions made of resin are
alternately arranged.
[0013]
Preferably, the mechanical impedance of the entire intermediate member 20 has an intermediate
value between the mechanical impedance of the edge 6 and the mechanical impedance of the
frame 11. By having such a mechanical impedance in addition to the above requirements, the
reflection of vibration as a whole is further suppressed, and a speaker unit having an even better
sound quality can be obtained.
[0014]
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Alternatively, at least one of the plurality of portions has a thickness different from that of the
other portion. Different vibration propagation characteristics can also be imparted by changing
the thickness. The portions having different thicknesses are combined and arranged in any
appropriate manner as described above. For example, in the case of using an intermediate
member having two portions with different thicknesses in a speaker unit having an aperture of
16 cm and an aluminum frame, the thicknesses of the portions are 0.1 to 1.0 mm and 0.2 to 2.0
mm, respectively. .
[0015]
Alternatively, at least one of the plurality of portions has a radial width different from that of the
other portions. Varying the width can also impart different vibration propagation characteristics.
The parts of different widths are combined and arranged in any suitable manner, as described
above. Such an intermediate member 20 is illustrated in FIGS. 3 and 4.
[0016]
Alternatively, at least one of the plurality of portions has a plurality of portions having different
vibration propagation characteristics (this means that at least one of the plurality of divided
portions is different from the other portions). One of the aspects “having propagation
characteristics”. For example, the at least one portion has a plurality of portions having different
thicknesses. Also, for example, the intermediate member 20 has a planar shape as illustrated in
FIGS. 5 and 6.
[0017]
Alternatively, as the intermediate member 20, a plurality of arc-shaped members as shown in
FIG. 7 may be used (also in this case, "a vibration in which at least one of a plurality of divided
portions is different from other portions. (Included in one of the "having propagation
characteristics").
[0018]
The intermediate member 20 may be attached to the edge 6 and the frame 11, or may be insertmolded on the edge 6.
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Insert molding is preferred. It is because fixation is easy even in the case of having portions with
different thicknesses, and the influence of the adhesive can be eliminated.
[0019]
In another embodiment of the present invention, the edge 6 is fixed to the outer peripheral
portion of the diaphragm 5 via the intermediate member 20. The intermediate member 20 may
be attached to the edge 6 and the diaphragm 5, may be insert-molded to the edge 6, or may be
insert-molded to the diaphragm 5. The intermediate member 20 is the same as the above except
that it is formed to fit the outer peripheral portion of the diaphragm 5.
[0020]
In still another embodiment of the present invention, the dust cap 7 is fixed to the upper end
portion of the voice coil 3 or the upper central portion of the diaphragm 5 via the intermediate
member 20. The intermediate member 20 may be attached to the voice coil 3 and the dust cap 7,
may be attached to the diaphragm 5 and the dust cap 7, and may be insert-molded on the
diaphragm 5. The intermediate member 20 is the same as that described above except that it is
formed to fit to the upper end portion of the voice coil 3 or the central portion of the upper
surface of the diaphragm 5.
[0021]
In still another embodiment of the present invention, the voice coil 3 is fixed to the inner
periphery of the diaphragm 5 through the intermediate member 20. The intermediate member
20 may be attached to the voice coil 3 and the diaphragm 5 or may be insert-molded on the
diaphragm 5. The intermediate member 20 is the same as the above except that it is formed to be
compatible with the voice coil 3.
[0022]
EXAMPLES The present invention will be specifically described by way of the following examples,
but the present invention is not limited to these examples.
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[0023]
EXAMPLE 1 A speaker as shown in FIG. 1 is formed by insert-molding an intermediate member
which is divided into six in the circumferential direction and in which portions made of paper and
portions made of butyl sheet are alternately arranged. A unit (bore 16 cm, iron plate frame) was
produced.
On the other hand, a speaker unit (comparative example) as shown in FIG. 9 was produced in the
same manner as described above except that the conventional reinforcing arrow paper was used.
The frequency characteristics of each of the obtained speaker units were measured. The results
are also shown in FIG.
[0024]
As apparent from FIG. 8, the speaker unit of the present invention has a smaller peak in the band
of 6000 to 10000 Hz as compared with the speaker unit of the comparative example. This
indicates that the speaker unit of the present invention is low in offensive sound and excellent in
sound quality. Also in the sensory evaluation, the result is obtained that the speaker unit of the
present invention is more comfortable to hear.
[0025]
According to the present invention, resonance is suppressed by appropriately arranging an
intermediate member having a plurality of portions having different vibration propagation
characteristics in the fixing portion of each component of the speaker unit. , Can obtain a speaker
unit having excellent sound quality.
[0026]
Brief description of the drawings
[0027]
1 is a schematic cross-sectional view showing the configuration of a speaker unit according to a
preferred embodiment of the present invention.
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[0028]
2 is a schematic view showing an intermediate member according to a preferred embodiment of
the present invention.
[0029]
3 is a schematic view showing an intermediate member according to another embodiment of the
present invention.
[0030]
4 is a schematic view showing an intermediate member according to still another embodiment of
the present invention.
[0031]
5 is a schematic view showing an intermediate member according to still another embodiment of
the present invention.
[0032]
6 is a schematic view showing an intermediate member according to still another embodiment of
the present invention.
[0033]
7 is a schematic view showing an intermediate member according to still another embodiment of
the present invention.
[0034]
8 is a graph showing the comparison of the frequency characteristics of the speaker unit of the
present invention and the conventional speaker unit.
[0035]
9 is a schematic cross-sectional view showing the configuration of a conventional speaker unit.
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[0036]
Explanation of sign
[0037]
Reference Signs List 1 speaker unit 2 magnetic circuit 3 voice coil 4 damper 5 diaphragm 6 edge
7 dust cap 11 frame 20 intermediate member
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