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DESCRIPTION JPH08275291

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH08275291
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker damper suitable for an elliptical speaker unit.
[0002]
2. Description of the Related Art A damper as a suspension for supporting the central portion
side of a diaphragm (cone) of a cone speaker unit, for example, is easy to move in the vibration
direction of the cone with a cone edge supporting the outer periphery of the cone. It is shaped so
as to have rigidity in the perpendicular direction.
[0003]
The damper also prevents cone paper and voice coil from coming into contact with the pole piece
or yoke on the side of the gap as the voice coil moves in the gap, and to ensure that the cone
paper and voice coil are in a stationary position. It also plays the role of holding it.
[0004]
Therefore, from the same performance as the cone edge, since it affects the lowest resonance
frequency f0 and takes the same amplitude, it can follow any amplitude with moderate softness
to the motion of the cone paper, Materials and shapes are required to be able to sufficiently
suppress the movement of the
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[0005]
Incidentally, as such a damper, there are a corrugation damper formed by impregnating a resin
with a resin and heating and forming the same, and a butterfly damper formed by punching a
thin Bakelite plate or a metal plate.
[0006]
By the way, in the case of a damper for supporting the central side of an elliptical diaphragm
(cone), the outer diameter of the damper is the minor axis direction of the elliptical diaphragm
(cone). Because the diameter of the damper is reduced, it is difficult to obtain the required
compliance.
Therefore, in order to obtain the required compliance, a soft material is used or a corrugation
shape is devised.
[0007]
However, even when using a soft material or devising the corrugation shape in this way, the
above-mentioned circular damper, in which the outer diameter of the damper is matched to the
minor axis direction of the elliptical diaphragm (cone), As described above, since the aperture is
small, there is a limit to obtain necessary and sufficient compliance, which hinders the extension
of the bass characteristic (f0).
[0008]
The present invention has been made in view of such circumstances, and it is an object of the
present invention to provide a speaker damper which can obtain necessary and sufficient
compliance when supporting an elliptical diaphragm (cone). Do.
[0009]
According to a first aspect of the present invention, there is provided an inner peripheral frame
into which a voice coil bobbin is inserted, an outer peripheral frame having a substantially
elliptical shape engaged with a speaker frame, the inner peripheral frame and the outer
peripheral frame And a plurality of movable arms bridged between the plurality of movable arms,
wherein one end of the movable arm is supported by the outer peripheral frame at a position less
than 45 degrees when viewed from the major axis direction of the outer peripheral frame It is
characterized by
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[0010]
The invention according to claim 2 is characterized in that positioning means for the speaker
frame is formed on the outer peripheral frame.
[0011]
The invention according to claim 3 is characterized in that the inner peripheral frame, the outer
peripheral frame and the movable arm are made of resin and integrally molded by injection
molding.
[0012]
In the speaker damper of the present invention, one end of a plurality of movable arms bridged
between an inner peripheral frame into which a voice coil bobbin is inserted and an outer
peripheral frame of a substantially elliptical shape engaged with the speaker frame is Since the
outer frame is supported by the outer frame at a position less than 45 degrees when viewed from
the major axis direction of the outer frame, compliance equivalent to that of a circular damper
having a radius commensurate with the length of the movable arm with respect to the outer
frame can be obtained. it can.
[0013]
By the way, if the support of the movable arm with respect to the outer peripheral frame is set to
a position exceeding 45 degrees, it will be close to the minor axis direction of the substantially
elliptical outer peripheral frame, and the radius corresponding to the length of the movable arm
with respect to the outer peripheral frame The same degree of compliance as the circular damper
is reduced.
[0014]
Further, since the positioning means for the speaker frame is formed on the outer peripheral
frame, even in the case of an axisymmetric elliptical damper in which positioning is difficult,
positioning for the speaker frame is facilitated.
[0015]
Furthermore, since the outer peripheral frame, the inner peripheral frame and the movable arm
that constitute the damper are made of resin and integrally molded by injection molding, the
thickness of the damper is limited by the limitation of the thickness of the material like a damper
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formed by ordinary punching. Is made unique and it is difficult to obtain the required
compliance, the thickness can be appropriately set by the mold, so partial uneven thickness can
be achieved, and sufficient compliance can be obtained. .
[0016]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be
described in detail with reference to the drawings.
1 and 2 show an elliptical cone speaker unit according to an embodiment of the speaker damper
of the present invention.
[0017]
As shown in these figures, ring-shaped magnets 3 and 4 are fixed to the upper and lower sides of
the pole yoke 2 housed inside the magnetic circuit case 1.
A ring-shaped plate 5 is fixed to the upper surface side of the magnet 4.
The voice coil 7 wound around the coil bobbin 6 is disposed in the magnetic gap between the
pole piece 2 a of the pole yoke 2 and the plate 5.
The voice coil 7 is connected to the terminal 13 through the lead wire 14.
[0018]
The coil bobbin 6 is inserted into the inner peripheral frame 9A of the butterfly damper 9 and
supported elastically.
The outer peripheral frame 9B of the butterfly damper 9 is integrated with the inner peripheral
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frame 9A via a plurality of movable arms 9b, and is fixed to the hold step 8a on the inner surface
of the speaker frame 8.
Here, the butterfly damper 9 is made of resin and is injection molded, and the inner peripheral
frame 9A has a circular shape according to the shape of the coil bobbin 6, and the outer
peripheral frame 9B has an elliptical diaphragm (described later) The cone is approximately the
same as 10 in shape.
[0019]
Furthermore, as shown in FIG. 3, positioning grooves 9 a are formed in the major axis direction
of the outer peripheral frame 9 B of the butterfly damper 9, and positioning projections 8 b are
formed in the hold stepped portion 8 a of the speaker frame 8. , The positioning of the butterfly
damper 9 with respect to the speaker frame 8 is performed.
Thereby, the support balance by the butterfly damper 9 with respect to the elliptical shaped
diaphragm (cone) 10 is maintained favorably.
[0020]
That is, although the usual circular damper is point-symmetrical, the positioning with respect to
the speaker frame 8 is not necessary. However, since the elliptical butterfly damper 9 is
axisymmetrical, as shown in FIG. If 8b and the positioning groove 9a are not provided,
positioning of the butterfly damper 9 becomes difficult, and the support balance of the elliptical
damper (cone) 10 by the butterfly damper 9 is lost. .
[0021]
Further, the cone edge 11 of the diaphragm (cone) 10 having an elliptical end on the open end
side of which one end is fixed to the coil bobbin 6 is fixed to the open end side of the speaker
frame 8 via the gasket 12.
[0022]
Subsequently, the operation of the above-described elliptical butterfly damper 9 will be
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described.
First, FIG. 5 shows the details of the above-mentioned elliptical butterfly damper 9. In the figure,
a total of eight movable arms 9b and 9c are bridged between the inner peripheral frame 9A and
the outer peripheral frame 9B. Shows the case.
[0023]
In the case of the butterfly damper 9 shown in the figure, one end of each of the movable arms
9b and 9c bridged between the inner peripheral frame 9A and the outer peripheral frame 9B is
supported at the point of an arc of the outer peripheral frame 9B. .
Further, since the butterfly damper 9 has a line-symmetrical shape, for example, two lead lines
a2 (supporting points A and K) at an optimum angle .theta. (Less than 45 degrees) formed by the
center line a1 in the major axis direction. Even if the movable arm 9b on the tangent line of a)
and a3 (the tangent point of the support point key and w) does not have line symmetry, the
support balance by the butterfly damper 9 with respect to the diaphragm (cone) 10 is well
maintained.
Similarly, even if the movable arms 9c on (supporting points A and O tangents) and (supporting
points C and E tangents) are not axisymmetrically supported by the butterfly damper 9 with
respect to the diaphragm (cone) 10 Balance is kept well.
[0024]
By the way, as shown in FIG. 6, when looking at the case of the circular butterfly damper 20
which is normal point-symmetrical (in this example, the movable bridge bridged between the
inner circumferential frame 21 and the outer circumferential frame 22) In the case of a total of
six arms 23 are supported by the points of the outer frame 22 at points a to f), for example, lead
line b2 (tangent line of support points a and d) and lead line b3 The support balance can not be
maintained well unless the movable arms 23 are formed in line symmetry with respect to the
lead-out line b1 located in the middle of the tangent line.
[0025]
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Next, the support position of the support point arc with the outer peripheral frame 22 in FIG. 5
will be examined.
FIG. 7 (a) shows only the support point i for convenience of explanation, and when the angle θ
of the lead line a2 with respect to the center line a1 in the major axis direction is less than 45
degrees, FIG. 7 (b). As shown in the above, the same degree of compliance as the circular damper
of radius a can be obtained.
Therefore, in the case of the support point a inside the support point i, it is possible to obtain the
same degree of compliance as a circular damper larger than the radius a.
[0026]
Incidentally, as shown in FIG. 8 (a), when the angle θ of the lead line a2 with respect to the
center line a1 in the major axis direction is 45 or more, as shown in FIG. It can be seen that the
degree of compliance is smaller than that of the circular damper having the radius a shown in
FIG. 7B.
[0027]
Furthermore, when injection molding the butterfly damper 9, the end portions of the movable
arms 9b and 9c of the support points of the outer peripheral frame 22 in FIG. 5 should be
molded thicker than the other portions (thickness deviation) By this, since the durability is
increased, it becomes easy to obtain the desired compliance, which is effective in extending the
low range characteristic (f0) of the elliptical cone speaker unit.
[0028]
As described above, in the present embodiment, the plurality of movable arms 9 b and 9 c
bridged between the inner peripheral frame 9 A into which the voice coil bobbin is inserted and
the substantially oval outer peripheral frame 9 B engaged with the speaker frame 8. Since one
end of the outer frame 9B is supported by the outer frame 9B at a position less than 45 degrees
when viewed from the major axis direction of the outer frame 9B, a circular shape having a
radius commensurate with the length of the movable arms 9b and 9c with respect to the The
same level of compliance as the damper can be obtained.
[0029]
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That is, when the support of the movable arms 9b and 9c with respect to the outer peripheral
frame 9B is set at a position exceeding 45 degrees, it approaches the minor axis direction of the
substantially elliptical outer peripheral frame 9B, and the movable arms 9b and 9c This is
because the same degree of compliance as a circular damper having a radius commensurate with
the length is reduced.
[0030]
Further, the positioning groove 9a is formed in the outer peripheral frame 9B, and the
positioning projection is performed by engaging with the positioning projection 8b formed in the
hold step portion 8a of the speaker frame 8, so that the line symmetry is made. Therefore, even
in the case of the elliptical butterfly damper 9 whose positioning is difficult, positioning relative
to the speaker frame 8 is facilitated.
[0031]
Furthermore, since the butterfly damper 9 is made of resin and integrally molded by injection
molding, the thickness of the damper is made unique by limiting the thickness of the material
like a damper formed by ordinary punching, and the necessary compliance is Since the thickness
can be appropriately set by the mold as compared with the one that is difficult to obtain, partial
uneven thickness can also be achieved, and sufficient compliance can be obtained.
[0032]
As described above, according to the speaker damper of the present invention, the bridge is
formed between the inner peripheral frame into which the voice coil bobbin is inserted and the
substantially oval outer peripheral frame engaged with the speaker frame. Since one end of each
of the plurality of movable arms is supported on the outer peripheral frame at a position less
than 45 degrees when viewed from the major axis direction of the outer peripheral frame, a
circular shape having a radius commensurate with the length of the movable arm with respect to
the outer peripheral frame The same level of compliance as the damper can be obtained.
[0033]
Further, since the positioning means for the speaker frame is formed on the outer peripheral
frame, even in the case of an axisymmetric elliptical damper in which positioning is difficult,
positioning for the speaker frame is facilitated.
[0034]
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Furthermore, since the outer peripheral frame, the inner peripheral frame and the movable arm
that constitute the damper are made of resin and integrally molded by injection molding, the
thickness of the damper is limited by the limitation of the thickness of the material like a damper
formed by ordinary punching. Is made unique and it is difficult to obtain the required
compliance, the thickness can be set appropriately by the mold, so partial uneven thickness can
be achieved, and sufficient compliance can be obtained. Can.
Therefore, it is possible to obtain necessary and sufficient compliance when supporting the
elliptical shaped diaphragm (cone).
[0035]
Brief description of the drawings
[0036]
1 is a half-cut sectional view showing an elliptical cone speaker unit according to an embodiment
of the speaker damper of the present invention.
[0037]
2 is a perspective view showing the cone speaker unit of FIG.
[0038]
3 is a diagram for explaining the positioning state of the butterfly damper relative to the speaker
frame of the cone speaker unit of FIG.
[0039]
4 is a diagram for explaining the positioning of the butterfly damper relative to the speaker
frame of the cone speaker unit of FIG.
[0040]
5 is a plan view showing the details of the butterfly damper of FIG.
[0041]
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6 is a plan view for explaining the operation of the butterfly damper of FIG.
[0042]
7 is a view for explaining the support position of each movable arm with respect to the outer
peripheral frame in the butterfly damper of FIG.
[0043]
<Figure 8> It is the figure in order to explain the operation of the support position of each
movable arm vis-a-vis the peripheral frame in the butterfly damper in Figure 7.
[0044]
Explanation of sign
[0045]
Reference Signs List 2 pole yoke 3, 4 magnet 5 plate 6 coil bobbin 7 voice coil 9 butterfly
damper 8 speaker frame 8a hold step portion 8b positioning projection 9a positioning groove 9b,
9c movable arm 9A inner circumferential frame 9B outer circumferential frame 10 diaphragm
(cone ) 11 cone edge
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