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JP2006196962

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DESCRIPTION JP2006196962
PROBLEM TO BE SOLVED: To provide a diaphragm in which the frequency of split resonance is
dispersed with a simple shape in a conical diaphragm having a circular outer periphery, and
which is easy to manufacture. SOLUTION: In a cone type diaphragm having a circular outer
periphery, the height h from the voice coil bobbin joint portion 1 to the outer peripheral edge of
the inner periphery of the cone type diaphragm 2 is constant, and the inner periphery of the
cone type diaphragm 2 is The length from the voice coil bobbin joint portion 1 to the outer
periphery of the above is continuously changed. [Selected figure] Figure 1
Electroacoustic transducer diaphragm
[0001]
The present invention relates to a cone-shaped diaphragm for an electroacoustic transducer, and
more particularly to a diaphragm for an electroacoustic transducer in which split resonance is
dispersed.
[0002]
The diaphragms used in conventional general speakers are conical, and the shape of the
diaphragm is symmetrical with respect to the central axis of the diaphragm, and since the half
apex angle is constant, the inherent vibration mode is likely to appear Affected the regeneration
band as dips and peaks.
[0003]
Various methods have been devised as means for solving the above.
12-05-2019
1
[0004]
For example, Japanese Patent Application Laid-Open No. 9-37385 discloses a configuration in
which a slit is provided in the vicinity of the middle or outer periphery from the outer periphery
to the inner periphery of a conical diaphragm and closed with a sealing material or a visco-elastic
material.
The diaphragm excites non-axisymmetric resonance modes by slits to disperse resonances.
[0005]
As another example, as disclosed in Japanese Patent Application Laid-Open No. 11-205895, the
contour line of the curved surface from the outer periphery to the inner periphery is a polygon,
and the diaphragm having a shape changing in a circle toward the voice coil joint portion There
is disclosed a speaker using a roll edge, in which the bonding portion with each other has a
polygonal shape and changes to a circular shape toward the outer diameter.
This is to disperse the concentric resonance generated at the roll edge.
[0006]
Further, Japanese Patent Application Laid-Open No. 2000-354289 discloses a diaphragm in
which the height between the outer periphery of a substantially conical diaphragm and the
junction with the voice coil bobbin provided concentrically changes continuously.
This changes the half apex angle all the way around the cone and also changes the length of the
generatrix so as to disperse the frequency of the split resonance. JP, 9-37385, JP, 11-205, 595,
JP, 2000-354289, A
[0007]
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2
However, as in the above-mentioned JP-A-9-37385, in the configuration in which the slit is
provided in the middle or outer periphery from the outer periphery to the inner periphery of the
conical diaphragm and closed by the sealing material or the visco-elastic material The process of
providing and pasting the seal or coating and closing the viscoelastic material is complicated and
causes cost increase.
[0008]
Further, as disclosed in JP-A-11-205895, the contour line of the curved surface extending from
the outer periphery to the inner periphery is a polygon, and the bonded portion of the diaphragm
and the diaphragm has a shape that changes in a circle towards the voice coil joint. In the case of
a polygonal shape that uses a roll edge that changes to a circular shape toward the outer shape,
the shape is complicated, so the mold cost becomes very expensive, the manufacturing process
becomes complicated, and the cost increases.
[0009]
Further, as in Japanese Patent Application Laid-Open No. 2000-354289, the diaphragm is also
complicated in shape with respect to the diaphragm in which the height between the outer
periphery of the substantially conical diaphragm and the junction with the voice coil bobbin
provided concentrically changes continuously. As a result, the mold cost is high, the
manufacturing process is complicated, and the cost is increased.
[0010]
In view of the above, it is an object of the present invention to provide a diaphragm that is easy
to manufacture as well as disperses the frequency of split resonance with a simple shape in a
cone-shaped diaphragm having a circular outer periphery.
[0011]
According to the invention of claim 1, in the cone diaphragm having a circular outer periphery,
the height h from the voice coil bobbin joint portion 1 to the outer peripheral edge of the inner
periphery of the cone diaphragm 2 is constant. The length from the voice coil bobbin joint
portion 1 on the inner circumference to the outer circumference is continuously changed.
The invention of claim 2 is characterized in that in the claim 1 aspect, the inner peripheral shape
of the cone type diaphragm 2 is substantially a track shape or an oval.
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3
[0012]
According to the present invention, the height from the voice coil bobbin joint to the outer
periphery of the inner periphery of the cone type diaphragm is made constant, and the length
from the voice coil bobbin joint to the outer periphery of the cone type diaphragm is
continuously changed. Since the half apex angle is continuously changed, it is possible to
disperse split resonances, and thus it is possible to secure a flat and wide reproduction band.
[0013]
In addition, since the shape is simple, it can be manufactured easily and inexpensively.
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0015]
FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view of B-B 'in
FIG. 1, and the right half is shown in cross section along O-B' in FIG.
FIG. 3 is a side view of A-A 'in FIG. 1, and the right half is shown in a cross-section along O-A' in
FIG.
4 shows an enlarged view of the right half of FIG. 2, and FIG. 5 shows an enlarged view of the
right half of FIG.
[0016]
In these figures, a voice coil bobbin joint portion 1 having a substantially track shape includes a
pair of long side portions 1a having linear portions, a pair of arc-shaped short side portions 1b,
and arc-shaped corner portions 1c between them. Reference numeral 2 denotes a cone-shaped
diaphragm formed on the outer periphery thereof and having a circular outer periphery, and 3
denotes an up-roll type roll edge in which the inner peripheral edge is joined to the outer
peripheral edge of the cone-shaped diaphragm 2.
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[0017]
The characteristic feature of the present invention is that, as shown in FIGS. 2 to 5, the height
from the front end of the voice coil bobbin joint portion 1 on the inner periphery of the cone type
diaphragm 2 to the outer peripheral edge which is the front end of the cone type diaphragm 2 H
is constant.
[0018]
Then, by making the outer shape of the voice coil bobbin joint portion 1 substantially into a track
shape, as shown in FIG. 1, the length from the voice coil bobbin joint portion 1 on the inner
periphery of the cone type diaphragm 2 to the outer peripheral edge is continuously made. It is
in changing.
[0019]
That is, as can be seen from FIG. 1, the length l1 from the front end of each linear long side
portion of the voice coil bobbin joint portion 1 having a substantially track shape to the outer
peripheral edge of the cone type diaphragm 2 is longest and formed in an arc. The length l3 from
the corner to the outer peripheral edge of the cone type diaphragm 2 is shorter than the length
l1 and the length l2 from the top of the arc-shaped short side to the outer peripheral edge of the
cone type diaphragm 2 is the shortest The length is continuously changed along the shape of the
voice coil bobbin joint 1.
[0020]
The height h from the inner periphery to the outer periphery of the cone-shaped diaphragm 2 is
made constant, and the length of the outer periphery from the voice coil bobbin joint 1 to the
cone-shaped diaphragm 2 is changed. As shown in FIG. 5, the half apex angle θ1 of the length l1
part and the half apex angle θ2 of the length l2 part are different, and the half apex angle is
continuously along the outer periphery of the cone-shaped diaphragm 2 Change.
[0021]
Thus, the length from the voice coil bobbin joint portion 1 to the outer peripheral edge of the
cone type diaphragm 2 is continuously changed, etc., and accordingly, the half apex angle θ of
the voice coil bobbin joint portion 1 of the cone type diaphragm 2 is also By changing
continuously, the rigidity is partially made different, and the split resonance of the cone-shaped
diaphragm 2 is dispersed.
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5
[0022]
That is, in the radial direction of the top of the long side, corner, and arc-like short side of the
voice coil bobbin joint 1 of the cone-shaped diaphragm 2, the regions in the radial direction are
different in rigidity, and the corner is shorter than the long side. The rigidity is improved by
curving the side area.
[0023]
By changing the rigidity of the voice coil bobbin joint portion 1, that is, the diaphragm neck
portion, resonance is dispersed, and a peak on the frequency characteristic becomes difficult to
appear.
[0024]
Although not particularly shown, a voice coil of a corresponding shape is joined to the voice coil
bobbin joint portion 1, and this voice coil is disposed in the magnetic gap of the internal or
external magnetic circuit.
The acoustic transducer can be assembled by supporting the voice coil via a damper, bonding the
outer peripheral portion of the roll edge 3 to the outer peripheral portion of the frame, and
disposing the magnetic circuit at the bottom of the frame.
[0025]
FIG. 6 shows the frequency characteristics of the product of the present invention in which the
half apex angle is continuously changed in this manner and the conventional product in which
the half apex angle is constant.
A is the product of the present invention, and B is the conventional product.
According to the present invention, since the division resonance is dispersed, the frequency
characteristic becomes flat, and a wide reproduction band can be obtained, and the sound quality
can be improved.
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6
[0026]
In the embodiment shown in FIG. 1, the outer shape of the voice coil bobbin joint portion 1 is
substantially in the shape of a track, but the same operation and effect can be obtained with an
oval (elliptical) shape.
[0027]
In addition, the height from the voice coil bobbin junction to the outer periphery of the coneshaped diaphragm inner circumference is made constant, the shape of the voice coil bobbin
junction 1 is polygonal, and the length from the voice coil bobbin junction to the cone diaphragm
outer edge The same effect can be obtained by changing the height continuously.
[0028]
FIG. 1 shows a plan view of an embodiment of the present invention.
The partial cross section side view of the B-B 'line | wire in FIG. 1 is shown.
The partial cross section side view of the A-A 'line | wire in FIG. 1 is shown.
FIG. 3 is an enlarged explanatory view of the right half of FIG. 2;
The enlarged explanatory drawing of the right half part of FIG. 3 is shown.
The frequency characteristics of the conventional product and the product of the present
invention are shown.
Explanation of sign
[0029]
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1 voice coil bobbin joint portion 2 cone type diaphragm 3 roll edge h height from voice coil
bobbin joint portion to outer peripheral edge of cone type diaphragm θ1, θ2 half apex angle
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