JP2008103856

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DESCRIPTION JP2008103856
An object of the present invention is to provide a speaker unit which can realize a good
frequency response by utilizing a center cap. SOLUTION: The cone 3 as viewed in a front view,
the center cap 10 disposed at the center of the cone 3, the cone 3 and the center cap 10 are
integrally connected, and are disposed in the circumferential direction of the center cap 10. A
plurality of bridge-like reinforcing pieces 14 are provided, and each of the reinforcing pieces 14
is formed in a flat spire-like shape. [Selected figure] Figure 1
スピーカユニット
[0001]
The present invention relates to a speaker unit having a center cap.
[0002]
Conventionally, as a speaker unit of this type, a speaker board provided with a reinforcing plate
across a dustproof (center cap) at a short diameter portion of an oval (elliptical) cone paper
(cone) is known (patented Reference 1).
The reinforcing plate is provided so as to pass to the opposing surface on the short diameter side
of the cone paper, and an opening is formed in the portion facing the dust proof. Patent No.
3696045
01-05-2019
1
[0003]
The center cap not only prevents dust from adhering to the magnetic gap, but also has a function
of receiving vibration of a cone or a voice coil to vibrate and improving the frequency response
of the speaker unit. In the above-mentioned conventional speaker unit, the reinforcing plate
reinforces the short diameter direction of the cone, and unnecessary resonance and the like
possessed by the elliptical cone are suppressed. However, although the reinforcing plate has an
opening, the cone and center cap There was a problem that becomes an obstacle of the sound
emission. Moreover, since the angle of the major axis direction of the cone is shallow, it has been
difficult to effectively provide a reinforcing plate.
[0004]
An object of the present invention is to provide a speaker unit which can realize good frequency
response by utilizing a center cap.
[0005]
The speaker unit according to the present invention is characterized by comprising a cone, a
center cap disposed at the center of the cone, and a plurality of bridge-like reinforcing pieces
integrally connected to the cone and the center cap. .
[0006]
According to this configuration, since the plurality of bridge-like reinforcing pieces are integrally
connected to the cone and the center cap, the integrity of the cone and the center cap can be
secured.
As a result, unnecessary deformation of the cone can be suppressed, and the frequency response
can be made flat.
In addition, the plurality of reinforcing pieces do not widely cover the cone and the center cap,
and do not interfere with sound radiation from the cone and the center cap. In addition, although
it is preferable to arrange several reinforcement pieces by equal pitch in the circumferential
direction, it does not necessarily need to be equal pitch.
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[0007]
In this case, the plurality of reinforcing pieces preferably radially extend from the center cap.
[0008]
According to this structure, the designability around the center cap can be improved by the
plurality of reinforcing pieces.
[0009]
In this case, the cone is preferably formed in an elliptical shape in a front view, and the plurality
of reinforcing pieces are preferably configured by a pair of members arranged in the short
diameter direction of the cone.
[0010]
According to this configuration, the short diameter direction of the cone can be reinforced by the
pair of reinforcing pieces.
As a result, bending strength in the minor axis direction of the cone is increased, abnormal
vibration such as unnecessary resonance is suppressed, and good frequency response can be
obtained even with an elliptical cone.
Preferably, the reinforcing pieces are designed so that the bending strength in the minor axis
direction reinforced by the pair of reinforcing pieces is substantially the same as the bending
strength in the major axis direction.
In addition, "elliptical" in this case is a concept including an ellipse, an oval, and a rectangle
whose corner is rounded.
[0011]
In this case, it is preferable that each reinforcing piece is integrally molded with the center cap,
and the tip end side is adhesively fixed to the surface of the cone.
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[0012]
According to this configuration, each reinforcing piece can be easily formed without increasing
the number of parts, and cost increase can be suppressed.
In addition, as for the front end side of a reinforcement piece, it is preferable to take an adhesion
area as wide as possible in consideration of reinforcement.
[0013]
In this case, it is preferable that each reinforcing piece is formed in a flat stalk shape having a
center cap side as a base end and a cone side as a tip.
[0014]
According to this configuration, since the reinforcing piece itself can have sufficient strength,
unnecessary deformation of the cone can be sufficiently suppressed, and a better frequency
response can be realized.
In addition, in integral molding with a mold, molding can be easily performed.
[0015]
According to the speaker unit of the present invention, since the cone and the center cap can be
integrated by the plurality of reinforcing pieces, it is possible to realize a good frequency
response by utilizing the center cap.
[0016]
Hereinafter, a speaker unit according to an embodiment of the present invention will be
described with reference to the attached drawings.
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As shown in FIG. 1, the speaker unit 1 is an elliptical cone speaker, and a cone-shaped frame 2, a
front view elliptical cone 3 disposed inside the frame 2, and a top provided at the base of the
frame 2 The plate 4, the pole yoke 5 facing the top plate 4 with a gap, the annular magnet 6
interposed in the gap between the top plate 4 and the pole yoke 5, the top plate 4 and the pole
yoke 5 A voice coil 7 and a voice coil bobbin 8 wound around the voice coil 7 and suspendedly
connected to the cone 3, and a corrugated spider (damper) interposed between the voice coil
bobbin 8 and the base of the frame 2 And 9) and a center cap 10 provided at the center of the
cone 3. By applying a current based on an input signal to the voice coil 7, the suspended voice
coil 7 is driven to vibrate the cone 3 via the voice coil bobbin 8. As a result, reproduced sound is
emitted from the cone 3 and the center cap 10.
[0017]
The cone 3 has an outer peripheral edge on the distal end side supported by the open end of the
frame 2 via an annular edge 12 and an inner peripheral edge on the proximal end connected to
the distal end of the cylindrical coil bobbin 8. The center cap 10 is formed in a dome shape or a
reverse dome shape in a front view circular shape, and is bonded to the central portion of the
cone 3 so as to be coaxial. And a pair of reinforcement pieces 14 and 14 are provided so that it
may pass between the cone 3 and the center cap 10.
[0018]
The pair of reinforcing pieces 14, 14 are disposed on the axis (short axis on the short axis) of the
minor axis of the cone 3, and the middle position of the peripheral portion of the center cap 10
and the minor axis 3 a A bridge is provided so as to bridge between the peripheral edge of the
cone 3 and the peripheral edge of the center cap 10). Each reinforcing piece 14 is integrally
formed with a paper center cap 10, and is formed to have a flat spire shape with a center cap 10
side as a base end and a cone 3 side as a tip (substantially triangular in front view). The tip end
side of each reinforcing piece 14 is adhesively fixed to the surface of the short diameter portion
3 a of the cone 3. That is, each reinforcing piece 14 extends from the peripheral portion of the
center cap 10 to the middle position of the short diameter portion 3 a of the cone 3 on the short
axis of the cone 3 and integrally integrates the center cap 10 and the cone 3 It is connected.
[0019]
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As described above, since the center cap 10 and the cone 3 are integrally connected by the pair
of reinforcing pieces 14, the bending strength in the short diameter direction of the cone 3 is
increased, and the abnormal vibration is suppressed. Even if the cone 3 is elliptical, a good
frequency response can be obtained. In addition, the pair of reinforcing pieces 14 and 14 is
sufficiently small compared to the cone 3 and the center cap 10, and does not become an
obstacle to the radiation noise that affects the frequency response. Furthermore, since the
reinforcing piece 14 is formed in a flat stalk shape integrally with the center cap 10 and in
consideration of die cutting, the reinforcing piece 14 is easily formed with given strength without
increasing the number of parts. be able to.
[0020]
In the present embodiment, each reinforcing piece 14 is integrally formed with the center cap
10, but it is also possible to integrally form the reinforcing piece 14 with the cone 3 and bond
the tip to the center cap 10. Further, each reinforcing piece 14 may be formed separately from
the cone 3 and the center cap 10, and both ends may be adhered to the cone 3 and the center
cap 10, respectively. In this case, the reinforcing piece 14 can be easily provided on the existing
cone. On the other hand, the reinforcing piece 14 may have a shape such as a front view
rectangle or a front drum shape other than the flat spire shape described above.
[0021]
Next, different parts of the speaker unit 1 according to the modification of the first embodiment
will be mainly described with reference to FIG. In the speaker unit 1 according to the first
modification of FIG. 6A, the pair of reinforcing pieces 14 is disposed on the axis (long axis) of the
cone 3 in the long diameter direction, and the center cap 10 is provided. It is provided so as to be
bridged between the peripheral edge portion of and the lower position of the major diameter
portion 3 b of the cone 3. Also in this case, each reinforcing piece 14 is formed in a flat spire
shape and integrally with the center cap 10, and the tip end side thereof is adhesively fixed to the
cone 3.
[0022]
Similarly, in the speaker unit 1 according to the second modification of FIG. 6B, the four
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reinforcing pieces 14, 14, 14, 14 radiate at an angle of 45 ° with respect to the short axis and
the long axis of the cone 3 It is disposed so as to be bridged between the peripheral portion of
the center cap 10 and the cone 3. That is, the four reinforcing pieces 14, 14, 14 extend radially
so as to have a uniform pitch in the circumferential direction of the center cap 10. Also in this
case, each reinforcing piece 14 is formed in a flat spire shape and integrally with the center cap
10, and the tip end side thereof is adhesively fixed to the cone 3.
[0023]
As described above, since the center cap 10 and the cone 3 are integrally connected by the two
(pairs) reinforcing pieces 14 or the four reinforcing pieces 14, the unnecessary deformation of
the cone 3 is suppressed. And the frequency response can be flattened. In addition, as in the
second modified example, by arranging the four reinforcing pieces 14, 14, 14, 14 radially, the
designability of the center cap 10 (cone 3) can be improved.
[0024]
Next, different parts of the speaker unit 1 according to the second embodiment will be mainly
described with reference to FIG. The speaker unit 1 of this embodiment is a circular cone
speaker, and the cone 3 is formed circular in a front view. In the speaker unit 1, the four
reinforcing pieces 14, 14, 14, 14 are disposed in the longitudinal direction (on the vertical axis)
and the lateral direction (on the horizontal axis) of the cone 3, respectively. It is provided to be
bridged between the part and the cone 3. That is, the four reinforcing pieces 14, 14, 14 extend
radially so as to have a uniform pitch in the circumferential direction of the center cap 10. Also
in this case, each reinforcing piece 14 is formed in a flat spire shape and integrally with the
center cap 10, and the tip end side thereof is adhesively fixed to the cone 3.
[0025]
As described above, since the center cap 10 and the cone 3 are integrally connected by the four
reinforcing pieces 14, unnecessary deformation of the cone 3 can be suppressed, and the
frequency response is flattened. Can. Further, the design of the center cap 10 (cone 3) can be
improved by the four reinforcing pieces 14, 14, 14, 14. The number of reinforcing pieces is not
limited to four, and may be two or more. Further, as in the second modified example, the four
reinforcing pieces 14, 14, 14, 14 may be arranged to be inclined 45 ° with respect to the
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longitudinal direction and the lateral direction of the cone 3.
[0026]
It is a block diagram of the speaker unit concerning a 1st embodiment of the present invention. It
is a front view of the speaker unit concerning the modification of a 1st embodiment. It is a block
diagram of the speaker unit concerning 2nd Embodiment.
Explanation of sign
[0027]
1 speaker unit, 3 cones, 3a short diameter portion, 3b long diameter portion, 10 center cap, 14
reinforcing pieces
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