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DESCRIPTION JPH08205286

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DESCRIPTION JPH08205286
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker having an elongated structure and excellent sound quality.
[0002]
2. Description of the Related Art In recent years, with the spread of so-called high vision, wide
vision television and the like, the screen of a television is becoming generally wide. In addition,
narrow and thin television sets as a whole are desired from the housing situation in Japan.
[0003]
Since a speaker unit for a television (hereinafter referred to as a speaker) is usually attached to
both sides of a cathode ray tube, it contributes to increase the lateral width as viewed from the
front of the television set. Therefore, a speaker having a slender structure such as a square shape
or an oval shape has conventionally been used for television. The width of the cathode ray tube is
required to narrow the width of the speaker, and at the same time, the high sound quality of the
voice corresponding to the high picture quality of the screen is required.
[0004]
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1
However, in a general elongated speaker, since the central portion of the elongated diaphragm is
driven at one point, split resonance in the longitudinal direction is likely to be excited. As a result,
in the middle to high frequency band, peak-dips occur on the reproduced sound pressure
frequency characteristics, resulting in deterioration of the sound quality.
[0005]
At the same time, the support mechanism (damper) of the voice coil bobbin needs to have a small
radius of curvature in order to take an elongated structure, and the stiffness of the vibration
system is increased. As a result, the lowest resonance frequency f0 is increased, and it is difficult
to reproduce the bass range.
[0006]
In view of such problems, the present applicant has solved the above-mentioned problems in
Japanese Patent Application No. 6-110340, and although it has a narrow width (elongated
structure), split resonance is less likely to occur and flat frequency characteristics. The speaker
with an excellent sound quality has been proposed, which enables low-frequency reproduction
with low f0.
[0007]
Here, the above-mentioned conventional elongated speaker will be described with reference to
FIGS. 8 to 12.
FIG. 8 is an exploded perspective view showing components of a conventional elongated speaker,
and FIG. 9 is a perspective view showing the configuration of this speaker, and a part of the
components is cut to show the internal structure as well. . FIG. 10 is a cross-sectional view in the
major axis direction showing the configuration of the speaker. In FIGS. 8 to 10, reference
numeral 1 denotes an elongated diaphragm which generates air vibration. An edge 2 is bonded
to the outer peripheral portion of the diaphragm 1 and is held by the frame 9.
[0008]
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A magnetic circuit 10 is attached to the bottom of the frame 9, and one magnetic circuit 10 is
composed of a yoke 7 having a U-shaped cross section and a magnet 8 attached to the side of the
yoke 7. The magnet 8 is magnetized in the direction of the short side of the speaker such that the
side closer to the side face of the frame 9 is the N pole and the side closer to the central axis of
the diaphragm 1 is the S pole. Six sets of such magnetic circuits are provided.
[0009]
The voice coil bobbin 3 has the same contour as the outer peripheral portion of the diaphragm 1,
the upper end thereof is adhered to the diaphragm 1, and the voice coil is wound around the
lower end. A connecting member 5 is fixed between the surfaces facing each other in the minor
axis direction of the voice coil bobbin 3 in parallel with the vibration direction of the diaphragm
1 and at right angles to the facing surface.
[0010]
The connecting member 5 is a plate-like member whose upper portion is formed in a
semicircular shape and lower portion is formed in a rectangular shape, and the upper portion is
fixed to the diaphragm 1 and the lower end is fixed to the damper 6. It has become.
[0011]
The damper 6 is mounted in parallel with the minor axis direction of the diaphragm 1, and both
ends thereof are fixed to the frame 9.
FIG. 11 is a view showing a vertical cross section of the damper 6. The vertical cross section of
the damper 6 has a shape in which two inverted U-shapes are arranged side by side, and is
coupled to the connecting member 5 at the center top of the two inverted U-shapes. FIG. 12 is a
diagram showing the force-displacement characteristic of this damper.
[0012]
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3
In the loudspeaker of FIG. 10, since the diaphragm 1 integrally receives the driving force, the
split resonance in the major axis direction is less likely to be excited, and flat frequency
characteristics can be obtained in the middle-high range. Furthermore, since the damper is linear,
it does not receive a force in the lateral direction along with the vertical movement, so the
stiffness can be reduced. Therefore, the lowest resonance frequency f0 can be set low, and bass
reproduction is possible. From the above, this speaker has the feature that the sound quality is
excellent despite the elongated structure.
[0013]
However, the above-mentioned conventional loudspeakers have the following two problems.
[0014]
First, the speaker of FIG. 10 has a problem that the number of processes is increased because it
has a large number of bonding points as compared with a normal speaker at the time of its
assembly.
In particular, bonding of the voice coil bobbin and the connecting member is difficult because the
bonding area is small and high accuracy is required, and mass production is not easy.
[0015]
Second, the damper of FIG. 11 has a defect that the linearity of the force-displacement
characteristic is bad as shown in FIG. This is due to the shape of the damper, and in particular,
the stiffness (corresponding to the reciprocal of the slope of the curve in the figure) differs
between the upward displacement and the downward displacement, and the stiffness increases in
the upward displacement. The non-linearity of the force-displacement characteristic causes nonlinear distortion at the time of large amplitude, and in particular causes deterioration of the
sound quality in the bass range.
[0016]
An object of the present invention is to solve the above problems and to obtain a speaker
excellent in mass productivity, and to obtain a speaker with high distortion and good linearity of
force-displacement characteristics of a damper. It is.
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4
[0017]
According to a first aspect of the present invention, there is provided a non-axisymmetric
diaphragm having a major axis and a minor axis in plan view seen from the direction of vibration,
and an outer peripheral portion of the diaphragm. The strip is formed in a strip shape, the striplike inner peripheral portion is bonded to the outer peripheral portion of the diaphragm, and an
edge for holding the diaphragm in a vibrating manner, a voice coil bobbin bonded to the
diaphragm, and the voice A voice coil wound around an outer peripheral surface of a coil bobbin,
a magnetic circuit for applying a magnetic flux for vibration to the voice coil, and the vibration of
the voice coil bobbin between the surfaces facing each other in the minor axis direction of the
diaphragm A thin plate-like connecting member stretched parallel to the vibration direction of
the plate and at a right angle to the opposing surface, a damper for holding the lower end of the
connecting member in a vibrating manner, the outer peripheral portion of the edge, the magnetic
circuit, the damper Hold Comprising frame and, the, the connecting member and the voice coil
bobbin, characterized in that it is formed integrally.
[0018]
In the invention according to claim 2 of the present application, the planar shape viewed from
the vibration direction is formed in a band shape along a rectangular diaphragm having a long
side and a short side and an outer peripheral portion of the diaphragm. An inner peripheral
portion is adhered to an outer peripheral portion of the diaphragm, an edge for holding the
diaphragm in a vibrating manner, a voice coil bobbin adhered to the diaphragm, and a voice coil
wound around an outer peripheral surface of the voice coil bobbin A magnetic circuit for
applying a magnetic flux for vibration to the voice coil, and a surface of the voice coil bobbin
parallel to the vibration direction of the diaphragm and facing each other between the surfaces
facing each other in the short side direction of the diaphragm And a damper for holding the
lower end of the connection member in a vibrating manner, and an outer peripheral portion of
the edge, the magnetic circuit, and a frame for holding the damper. Voiceco Rubobin and the
connecting member is characterized by being formed integrally.
[0019]
The invention according to claim 3 of the present application is a diaphragm having a nonaxisymmetric shape having a major axis and a minor axis and having a plane shape as viewed
from the vibration direction, and curved in a convex shape in the sound radiation direction; An
edge which is formed in a band shape along the outer peripheral portion of the diaphragm, the
band-shaped inner peripheral portion is adhered to the outer peripheral portion of the
diaphragm, and which holds the diaphragm in a vibrating manner; A voice coil bobbin formed in
a band shape parallel to a vibration direction, a voice coil wound around an outer peripheral
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5
surface of the voice coil bobbin, a magnetic circuit for applying a magnetic flux for vibration to
the voice coil, and the voice coil bobbin Between the surfaces facing each other with respect to
the short side direction of the diaphragm, it is stretched parallel to the vibration direction of the
diaphragm and at a right angle to the opposing surface, and the upper end is formed in an arc
shape and the outer periphery of the arc shape is A thin plate coupled to the inner surface of the
diaphragm A connecting member, a damper for holding the lower end of the connecting member
in a vibrating manner, and an outer periphery of the edge, the magnetic circuit, and a frame for
holding the damper, wherein the voice coil bobbin and the connecting member are integrated. It
is characterized in that it is formed.
[0020]
The invention according to claim 4 of the present application is characterized in that, in addition
to the inventions according to claims 1 to 3, the diaphragm and the edge are integrally formed.
[0021]
The invention according to claim 5 of the present application is a diaphragm having a nonaxisymmetric shape having a major axis and a minor axis and having a plane shape as viewed
from the vibration direction, which is curved in a convex shape in the sound radiation direction;
An edge which is formed in a band shape along the outer peripheral portion of the diaphragm,
the band-shaped inner peripheral portion is adhered to the outer peripheral portion of the
diaphragm, and which holds the diaphragm in a vibrating manner; A voice coil bobbin formed in
a band shape parallel to a vibration direction, a voice coil wound around an outer peripheral
surface of the voice coil bobbin, a magnetic circuit for applying a magnetic flux for vibration to
the voice coil, and the voice coil bobbin Between the surfaces facing each other with respect to
the short side direction of the diaphragm, it is stretched parallel to the vibration direction of the
diaphragm and at a right angle to the opposing surface, and the upper end is formed in an arc
shape and the outer periphery of the arc shape is A thin plate coupled to the inner surface of the
diaphragm The diaphragm, the damper for holding the lower end of the connecting member in a
vibrating manner, the outer periphery of the edge, the magnetic circuit, and the frame for holding
the damper, the diaphragm, the voice coil bobbin, and The connecting member is characterized
in that it is integrally formed.
[0022]
In the invention according to claim 6 of the present application, the planar shape viewed from
the vibration direction is formed in a band shape along the non-axisymmetric diaphragm having
a major axis and a minor axis, and the outer peripheral portion of the diaphragm. A band-shaped
inner peripheral portion is adhered to an outer peripheral portion of the diaphragm, and an edge
for holding the diaphragm in a vibrating manner, a voice coil bobbin adhered to the diaphragm,
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and an outer peripheral surface of the voice coil bobbin A voice coil, a magnetic circuit for
applying a magnetic flux for vibration to the voice coil, and a surface of the voice coil bobbin
facing each other in the minor axis direction of the diaphragm are parallel to the vibration
direction of the diaphragm and A thin plate-like connecting member stretched at a right angle to
the opposing surface, a damper which holds the lower end of the connecting member so as to
vibrate and parallel to the minor axis of the diaphragm, an outer peripheral portion of the edge,
the magnetic circuit, Hold the damper And a vertical cross section of the damper has a shape in
which two U-shapes are arranged side by side, and a lower end of the connection member is
coupled to a central upper portion between the two U-shapes. It features.
[0023]
According to the inventions of claims 1 to 3 of the present application having such features, by
integrally forming the voice coil bobbin and the connecting member, the bonding location is
reduced and bonding of the difficult voice coil bobbin and the connecting member is difficult.
Mass production is improved, because
[0024]
Further, according to the invention of claim 4 of the present application, by integrally forming
each of the voice coil bobbin and the connection member, and the diaphragm and the edge, the
number of bonding places is further reduced, and the mass productivity is further improved.
[0025]
Further, according to the invention of claim 5 of the present application, by integrally forming
the diaphragm, the voice coil bobbin, and the connecting member, the number of bonding points
is further reduced, and the mass productivity is further improved.
[0026]
Furthermore, according to the invention of claim 6 of the present application, the vertical crosssectional shape of the edge is formed by arranging two U-shapes side by side, and by connecting
to the lower end of the connecting member at the center top of the two U-shapes The linearity of
the displacement characteristic is improved, the non-linear distortion at the time of large
amplitude is reduced, and the sound quality is improved.
[0027]
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7
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker according to a first
embodiment of the present invention will be described with reference to FIG.
FIG. 1 is an exploded perspective view showing components of the speaker of the elongated
structure in the first embodiment.
In the figure, 1 is an elongated diaphragm which generates air vibration.
An edge 2 is bonded to the outer peripheral portion of the diaphragm 1 and is held by the frame
9.
Further, six sets of magnetic circuits 10 similar to the conventional example are provided on the
bottom of the frame 9.
[0028]
The voice coil bobbin / connection member 11 has a track-type contour shape, the upper end
thereof is bonded to the diaphragm 1, and the voice coil 4 is wound around the lower end of the
bobbin portion.
The connecting member is formed between surfaces facing each other with respect to the minor
axis direction of the bobbin portion, in parallel to the vibration direction of the diaphragm 1 and
at right angles to the facing surface.
The bobbin and connection member 11 are integrally formed with a bobbin portion and a
connection member portion by a material such as polymethylpentene or a nylon-based composite
material.
[0029]
The lower end of the connecting member portion is vibratably held by the damper 6.
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8
The damper 6 is the same as that of the conventional example, and is mounted in parallel with
the minor axis direction of the diaphragm 1, and the other end is fixed to the frame.
In the speaker configured as described above, by integrally molding the voice coil bobbin and the
connecting member, the bonding location is reduced and adhesion of the difficult voice coil
bobbin and the connecting member becomes unnecessary, so that mass productivity improves.
[0030]
In this embodiment, the case where the shape of the diaphragm 1 is convex and the outline
shape of the voice coil bobbin / connection member 11 is a track type has been described, but
the shape is not limited thereto. Can also be configured using a flat diaphragm.
Further, the number and the positional relationship of the connecting members, the dampers,
and the magnetic circuits are not limited to those shown in the figure.
[0031]
Next, a speaker according to a second embodiment of the present invention will be briefly
described with reference to FIG.
FIG. 2 is an exploded perspective view showing components of the loudspeaker of the elongated
structure in the second embodiment.
In the figure, 1a is a rectangular flat diaphragm. The edge 2a is bonded to the outer peripheral
portion of the diaphragm 1a and is held by the frame 9a. The components other than the
diaphragm 1a, the edge 2a and the frame 9a are the same as those of the first embodiment, and
the description thereof will be omitted. The loudspeaker configured in this way also has the
effect of improving the mass productivity as in the first embodiment.
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9
[0032]
In the present embodiment, the case where the shape of the diaphragm 1a is a flat plate type and
the outline shape of the voice coil bobbin / connection member 11 is a track type has been
described, but the shape is not limited thereto.
[0033]
Next, a speaker according to a third embodiment of the present invention will be described with
reference to FIG.
FIG. 3 is an exploded perspective view showing the components of the loudspeaker having the
elongated structure in the third embodiment. In this figure, the diaphragm 1 is the same as that
of the first embodiment, and is oval and curved in a convex shape. The other components other
than the voice coil bobbin / connection member 12 are the same as in the first embodiment. Of
the voice coil bobbin / connection member 12, the bobbin portion is formed in a band shape
parallel to the vibration direction along the outer peripheral portion of the diaphragm 1, and the
upper end of the connection member portion is formed in an arc shape. The arc-like outer
periphery is adhered to the inner surface of the diaphragm 1.
[0034]
The upper arc-shaped portion of the connecting member reinforces the diaphragm 1 in the short
diameter direction. When such reinforcement is not performed, a resonance mode may occur in
the minor axis direction of the diaphragm, and non-linear distortion may occur due to bending
vibration. However, this is suppressed by reinforcing the diaphragm as described above, and it is
known that it has a great effect on reduction of the strain level (Japanese Patent Application No.
6-110340). Therefore, the speaker configured as in this embodiment has the effect of reducing
the distortion level in addition to the effects of the first embodiment.
[0035]
Next, a loudspeaker according to a fourth embodiment of the present invention will be described
with reference to FIG. FIG. 4 is an exploded perspective view showing the components of the
elongated speaker in the fourth embodiment. In this figure, the diaphragm / edge 13 has an edge
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10
formed on the outer periphery of a convexly curved diaphragm having an oval shape and is held
by the frame 9. Further, the components other than the diaphragm and edge 13 are the same as
those in the first embodiment.
[0036]
The diaphragm / edge is made of a material such as paper, cloth or plastic, and is integrally
formed so that the stiffness of the edge is smaller than that of the diaphragm while maintaining
the rigidity of the diaphragm. With respect to the speaker configured as described above, the
number of bonding points is further reduced as compared with the first embodiment, and the
mass productivity is further improved.
[0037]
In this embodiment, the case where the shape of the diaphragm 1 is convex and the outline
shape of the voice coil bobbin / connection member 11 is a track type has been described.
However, the shape is not limited to these. The same as the second embodiment.
[0038]
Next, a loudspeaker according to a fifth embodiment of the present invention will be briefly
described with reference to FIG.
FIG. 5 is an exploded perspective view showing the components of the loudspeaker with the
elongated structure in the fifth embodiment. In this embodiment, the diaphragm, the voice coil
bobbin, and the connecting member are integrally formed, and the configuration other than these
parts is the same as that of the third embodiment. The diaphragm / bobbin / connection member
14 is integrally formed of a material such as polymethylpentene or a nylon-based composite
material, as in the first embodiment. With respect to the speaker configured as described above,
the number of bonding points is reduced as compared with the first embodiment, and the mass
productivity is further improved.
[0039]
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11
Finally, a loudspeaker according to a sixth embodiment of the present invention will be described
with reference to FIGS. FIG. 6 is a block diagram of the damper of this embodiment, where (a) is a
perspective view and (b) is a vertical sectional view. The component configuration other than the
damper is the same as that of the conventional example or any of the first to fifth embodiments.
[0040]
The damper 6 a is mounted in parallel with the minor axis direction of the diaphragm (not
shown), and the other end is fixed to the frame 9. The vertical cross section of the damper 6a has
a shape in which two U-shapes are arranged side by side, and is coupled to the lower end of the
connecting member 5 at the central upper portion of the two U-shapes. FIG. 7 is a diagram
showing the force-displacement characteristic of this damper. When this is compared with FIG.
12, the linearity of the force-displacement characteristic is improved, and the difference in
stiffness between upward displacement and downward displacement is small. Therefore, this
configuration reduces non-linear distortion at the time of large amplitude and improves the
sound quality.
[0041]
As described above, according to the inventions of claims 1 to 5 of the present application, by
integrally molding the voice coil bobbin, the connecting member, etc., the number of bonding
points is reduced and the difficult voice coil bobbin is connected. Since adhesion of members is
unnecessary, mass productivity improves.
[0042]
Furthermore, according to the sixth aspect of the present invention, the linearity of the forcedisplacement characteristic is improved, the non-linear distortion at the time of large amplitude
is reduced, and the sound quality is improved.
[0043]
Brief description of the drawings
[0044]
1 is an exploded perspective view showing the components of the speaker in the first
embodiment of the present invention
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12
[0045]
2 is an exploded perspective view showing the components of the speaker in the second
embodiment of the present invention
[0046]
3 is an exploded perspective view showing the component parts of the speaker in the third
embodiment of the present invention
[0047]
4 is an exploded perspective view showing components of the speaker in the fourth embodiment
of the present invention
[0048]
5 is an exploded perspective view showing components of the speaker in the fifth embodiment of
the present invention
[0049]
FIG. 6 (a) is a perspective view showing a damper structure of a speaker according to a sixth
embodiment of the present invention.
[0050]
7 shows the force-displacement characteristic of the damper of the speaker in the sixth
embodiment of the present invention.
[0051]
Fig. 8 An exploded perspective view showing components of the conventional speaker
[0052]
FIG. 9 is a perspective view showing the configuration of the conventional speaker
[0053]
10 is a cross-sectional view in the major axis direction showing the configuration of the
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conventional speaker
[0054]
Fig. 11 A vertical sectional view showing a damper structure of the conventional speaker
[0055]
Figure 12 shows the force-displacement characteristic of the damper of the conventional speaker
[0056]
Explanation of sign
[0057]
1, 1a diaphragm 2, 2a edge 3 voice coil bobbin 4 voice coil 5 connecting member 6, 6a damper 7
yoke 8 magnet 9, 9a frame 10 magnetic circuit 11 voice coil bobbin and connecting member 12
voice coil bobbin and connecting member 13 diaphragm and edge 14 Diaphragm / voice coil
bobbin / connection member
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