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JP2000354289

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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 JP2000354289
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
cone-shaped speaker.
[0002]
BACKGROUND OF THE INVENTION Cone-shaped loudspeakers, which emit sound waves directly
from a substantially conical diaphragm (cone), are widely used.
[0003]
For example, as shown in FIG. 3, in the case of an external magnet type in the general coneshaped speaker 10, the front side of the ring-shaped magnet 11 (in this specification, the
radiation side of sound waves will be called the front side) The plate 12 made of a magnetic
material such as iron and the yoke 13 are attached to the back side (in the present specification,
the side opposite to the side of the sound wave radiation is called the back side).
[0004]
A center pole 14 is integrally formed at the center on the front side of the yoke 13.
A magnetic circuit having a gap (magnetic gap) 15 between the outer peripheral surface of the
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center pole 14 and the inner peripheral surface of the plate 12 is formed.
A frame 16 is mounted on the front side of the plate 12 coaxially with the center pole 14.
[0005]
On the other hand, in front of the plate 12, a substantially conical diaphragm (cone) 21 is
disposed. The outer peripheral edge 24 of the cone 21 is attached to the outer peripheral edge of
the frame 16. Further, in a state where the voice coil 23 wound around the cylindrical voice coil
bobbin 22 is inserted into the gap 15, the inner peripheral edge portion of the cone 21 and the
voice coil bobbin 22 are joined and attached.
[0006]
The frame 16 and the voice coil bobbin 22 are connected via a damper 25.
[0007]
As described above, in the conventional cone-shaped speaker, as shown in FIG. 4, the outer
periphery 21 o (outside diameter do) of the cone 21 and the contact ridge line with the voice coil
bobbin 22 The inner circumference 21i (inner diameter di) of the cone 21 is concentric and has a
circular shape perpendicular to the central axis of the voice coil bobbin 22.
[0008]
Further, the height (depth) h1 between the edge portion of the cone 21 and the inner peripheral
edge is the same over the entire circumference, and the half apex angle θ1 of the cone 21 and
the length of the corresponding generatrix are all over the entire circumference It is the same
throughout.
[0009]
For this reason, there is a problem that split resonance occurs in the diaphragm at a frequency
specific to the speaker to easily cause a peak, and the reproduction sound quality is deteriorated.
[0010]
In order to eliminate the deterioration of the reproduction sound quality caused by the split
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resonance as described above, the shape of the diaphragm is not coaxial with the voice coil, and
an eccentric cone speaker or an oblique cone whose orthogonal cone is not orthogonal to the
axis There is a speaker equipped with a so-called obtricone of a shape cut in a plane.
[0011]
In these eccentric cone loudspeakers and oblique cone loudspeakers, since the distance to the
periphery of the diaphragm is uneven, split resonance at the natural frequency does not occur,
and deterioration of the reproduction sound quality is resolved.
[0012]
However, in the case of using an eccentric cone speaker, assembly is difficult when using a noncircular frame, and when using a circular frame, there is a problem that the area occupancy of
the cone becomes small and the efficiency is poor.
[0013]
Further, in the oblique speaker, the voice coil becomes non-cylindrical, which causes a problem
that assembly is difficult.
[0014]
In view of the above, the present invention provides a loudspeaker that prevents deterioration of
characteristics due to the divided resonance at the natural frequency of the generally conical
diaphragm and has a large area ratio of the diaphragm and easy assembly. The purpose is to
[0015]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker according to
the invention of claim 1 is joined to a cylindrical voice coil bobbin and the voice coil bobbin at an
inner peripheral edge portion, and the outer peripheral edge is the voice coil bobbin And a
diaphragm having a shape in which the heights of the outer peripheral edge and the joint portion
with the voice coil bobbin continuously change.
[0016]
In the loudspeaker according to the first aspect of the invention, the area occupancy of the
diaphragm is large and the assembly is easy, and the length of the generatrix of the diaphragm
changes over the entire circumference, and the frequency of the split resonance is As a result, the
peak of the output sound pressure frequency characteristic is suppressed and the reproduction
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sound quality is improved.
[0017]
In the speaker according to the invention of claim 2, in the speaker according to claim 1, the
contact ridge line between the inner peripheral edge portion of the diaphragm and the voice coil
bobbin obliquely intersects the central axis of the voice coil bobbin. It is characterized in that it
has substantially the same shape as the outline of the cross section cut in a plane.
[0018]
In the loudspeaker according to the invention of claim 2 of this configuration, the reproduction
sound quality is improved by the dispersion of the resonance frequency, and the shape of the
contact ridge line between the diaphragm and the voice coil bobbin is relatively simplified.
Production of
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a loudspeaker according
to the present invention will be described below with reference to FIGS. 1 and 2. FIG.
[0020]
The overall configuration of the embodiment of the present invention is shown in FIG. 1, and the
configuration of the main part is shown in FIG.
In the two figures, parts corresponding to those in FIG. 3 and FIG. 4 are given the same reference
numerals.
[0021]
In the speaker 10A of the embodiment shown in FIG. 1, the plate 12 made of a magnetic material
such as iron and the yoke 13 are attached to the front and back sides of the ring-shaped magnet
11, A magnetic circuit having a gap 15 between the outer peripheral surface of the center pole
14 and the inner peripheral surface of the plate 12 is formed.
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A frame 16 is attached to the front of the plate 12 coaxially with the center pole 14.
[0022]
On the other hand, in front of the plate 12, a substantially conical diaphragm (cone) 21A is
disposed.
The edge 24 of the outer peripheral edge of the cone 21A is attached to the outer peripheral
edge of the frame 16, and the cone 21 is inserted in the gap 15 with the voice coil 23 wound
around the cylindrical voice coil bobbin 22 The inner peripheral edge portion 21A and the voice
coil bobbin 22 are joined and attached.
[0023]
The frame 16 and the voice coil bobbin 22 are connected via a damper 25.
[0024]
The configuration described above is the same as that of the prior art shown in FIG. 3 except for
the shape of the cone 21A.
[0025]
In this embodiment, as shown in FIG. 2, the shape of the cone 21A is the height of the outer
peripheral edge of the cone 21A, that is, the edge between the edge portion 24 and the junction
between the cone 21A and the voice coil bobbin 22. The shape is continuously changed so as to
be different at each circumferential position of the cone 21A.
[0026]
That is, as shown in FIG. 2, the height of a point 21p at which the height of the outer peripheral
edge 21o (outer diameter do) of the cone 21A and the inner peripheral edge 21j (inner diameter
di) becomes maximum is h2. The height of a point 21 q at which the heights of the outer
peripheral edge 21 o (outer diameter do) and the inner peripheral edge 21 j (inner diameter di)
are minimum is h3.
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In this example, the position of the point q is the position of the inner peripheral edge 21j
different from the point 21P by 180 degrees.
[0027]
The shape of the cone 21A is an inner peripheral edge 21j of the cone 21A, which is a contact
ridge line with the voice coil bobbin 22 by continuously changing the height from h2 to h3 over
the entire circumference of the cone 21A. Is inclined with respect to the central axis of the voice
coil bobbin, and the half apex angle changes from .theta.2 to .theta.3 (.theta.2 <.theta.3) over the
entire circumference of the cone 21A.
Corresponding to the half apex angles θ2 to θ3, the length of the generatrix of the cone 21A
also changes over the entire circumference.
[0028]
For example, in the case of a full range (full band) speaker having an aperture of about 10 cm,
θ2 = 45 ° and θ3 = 60 ° or so.
[0029]
The peak of the output sound pressure frequency characteristic is suppressed to, for example,
about 3 dB by dispersing the frequency of the divided resonance as described above
corresponding to the setting range of the half apex angle θ2 to θ3 and the reproduction sound
quality is improved. At the same time, frequency characteristics and sound quality can be
controlled to some extent.
[0030]
Further, in this embodiment, since the cone 21A is disposed over the entire area of the front end
of the frame 16, the efficiency and the appearance are good, and the voice coil 23 is wound
around the cylindrical voice coil bobbin 22. So, it is easy to assemble around the gap 15.
[0031]
Furthermore, in this embodiment, the heights of the outer peripheral edge 21o and the inner
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peripheral edge 21j of the cone 21A are changed from h2 to h3 over the entire circumference of
the cone 21A, and the half apex angle is changed from θ2 to θ3. Since it is made to make it
easy, manufacture of a cone mold is easy.
[0032]
In the cylindrical coordinate system having the central axis as the z axis, the changes in the
height (h2 to h3) and the half apex angle (θ2 to θ3) of the above-mentioned cone 21A may be
linear or linear with respect to the azimuthal angle. It does not have to be.
[0033]
Further, in the above embodiment, as shown in FIG. 2, the inner circumference 21 j of the cone
21 A whose half apex angle is changed from θ 2 to θ 3 obliquely intersects the central axis of
the voice coil bobbin 22 and It has a shape similar to that cut by a vertical curved surface.
[0034]
However, the shape of the cone 21A is not limited to such a shape, and its height is changed from
h2 to h3 over the entire circumference of the cone in the specific radial direction of the
substantially conical cone, The voice coil bobbin 22 may have a relatively simple shape (not
shown) as obliquely intersected with the central axis of the voice coil bobbin 22 and cut by a
plane perpendicular to the paper surface.
In this case, the manufacture of the cone mold is further facilitated, and the frequency of the split
resonance is dispersed to improve the reproduction sound quality as in the above embodiment,
and the efficiency and the appearance are good. The effects such as easy assembly are exhibited.
[0035]
As described above, according to the invention of claim 1, the area occupancy rate of the
diaphragm is large, the assembly is easy, the peak of the output sound pressure frequency
characteristic is suppressed, and the reproduction sound quality is improved. Improve.
[0036]
Further, according to the invention of claim 2, the reproduction sound quality is improved, and
the manufacture of the mold of the diaphragm becomes easy.
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