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JP2003116195

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003116195
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio devices and information communication devices.
[0002]
2. Description of the Related Art A conventional speaker will be described with reference to FIG.
FIG. 5 shows a cross-sectional view of a conventional speaker.
[0003]
As shown in FIG. 5, the magnetized magnet 1 is sandwiched between the upper plate 2 and the
yoke 3 to constitute an internal magnetic circuit 4. The frame 6 is coupled to the yoke 3 of the
magnetic circuit 4. The edge 7a of the diaphragm 7 is adhered to the periphery of the frame 6,
and the voice coil 8 coupled to the boundary with the edge 7a of the diaphragm 7 is coupled so
as to fit in the magnetic gap 5 of the magnetic circuit 4 The
[0004]
The above-mentioned loudspeakers are required to be miniaturized, for example, in accordance
with the miniaturization of the portable telephone incorporating them, and the reduction of the
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sound pressure level due to the reduction of the area of the diaphragm 7 It was an issue.
[0005]
The present invention solves the above-mentioned subject, and provides an excellent speaker
which can realize improvement in sound pressure level.
[0006]
In order to solve the above problems, the present invention has the following constitution.
[0007]
According to the first aspect of the present invention, the sub-cone is provided so as to be
coupled to the voice coil coupling portion of the diaphragm and an area inside the center portion
of the edge and to cover the edge portion of the diaphragm.
As a result, the sub-cone vibrates in the same phase as the diaphragm with respect to the vertical
vibration of the voice coil, and the sound pressure level can be improved by expanding the
diaphragm area.
[0008]
According to a second aspect of the present invention, the outer peripheral portion of the subcone is larger than the outer peripheral portion of the diaphragm.
Thereby, the diaphragm area can be expanded as much as possible, and the effect that the sound
pressure level can be greatly improved can be obtained.
[0009]
According to a third aspect of the present invention, the outer peripheral portion of the sub-cone
is formed in a substantially polygonal shape.
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As a result, the diaphragm area can be expanded as much as possible, and the sound pressure
level can be greatly improved, while realizing the sub-cone outer peripheral shape with a high
space factor corresponding to the set design. can get.
[0010]
According to a fourth aspect of the present invention, the outer peripheral portion of the subcone is formed in a substantially elliptical shape. As a result, it is possible to realize resonance
dispersion due to the substantially elliptical shape of the subcone while achieving the subcone
outer peripheral portion shape with a high space factor corresponding to the design of the set,
and to improve the sound pressure level and stabilize the frequency characteristics. The effect of
being able to
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0012]
(First Embodiment) The invention according to the first aspect of the present invention will be
described with reference to the first embodiment.
[0013]
FIG. 1 is a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
[0014]
As shown in FIG. 1, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
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The edge portion 27a of the diaphragm 27 is bonded to the peripheral portion of the frame 26,
and the voice coil 28 coupled to the diaphragm 27 is coupled so as to fit in the magnetic gap 25
of the magnetic circuit 24.
Further, the sub-cone 29 is coupled to an area inside the coupling portion of the voice coil 28 of
the diaphragm 27 and the central portion of the edge portion 27 a so as to cover the edge
portion 27 a of the diaphragm 27.
[0015]
With this configuration, the sub-cone 29 vibrates in the same phase as the diaphragm 27 with
respect to the vertical vibration of the voice coil 28, so the diaphragm area from the central
portion of the edge portion 27a not contributing to the normal sound pressure level
improvement is The sound pressure level can be improved.
[0016]
Second Embodiment The second embodiment of the present invention will be described below
with reference to the second aspect of the present invention.
FIG. 2 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention. A difference from the first embodiment is that the outer peripheral portion of the sub
cone 29 is made larger than the outer peripheral portion of the diaphragm 27. Thereby, the
diaphragm area can be expanded as much as possible in accordance with the set design, and the
sound pressure level can be significantly improved.
[0017]
Third Preferred Embodiment The third preferred embodiment according to the present invention
will be described below with reference to the third preferred embodiment. FIG. 3 shows a plan
view of a loudspeaker according to an embodiment of the present invention. A different point
from the first embodiment is that the outer peripheral portion of the sub cone 29 is formed in a
substantially square shape. As a result, the diaphragm area can be expanded as much as possible,
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and the sound pressure level can be significantly improved, while realizing the sub-cone outer
peripheral portion shape having a high space factor corresponding to the set design.
[0018]
Fourth Embodiment The fourth embodiment of the present invention will be described with
reference to the fourth aspect of the present invention. FIG. 4 shows a plan view of a loudspeaker
according to an embodiment of the present invention. The difference from the first embodiment
is that the outer peripheral portion of the sub-cone 29 has a substantially elliptical shape. As a
result, the diaphragm area can be expanded as much as possible while realizing the sub-cone
outer peripheral shape having a high space factor corresponding to the design of the set, and the
sound pressure level can be improved. Since resonance dispersion can be achieved by the subcone 29, stabilization of frequency characteristics can be realized.
[0019]
As described above, in the loudspeaker according to the present invention, the sub-cone is
coupled to the area inside the center of the coupled portion of the voice coil and the edge portion
so as to cover the edge portion of the diaphragm. With this configuration, the sub-cone vibrates
in the same phase as the diaphragm with respect to the vertical vibration of the voice coil, and
the sound pressure level can be improved by expanding the diaphragm area.
[0020]
As described above, the present invention can provide an excellent speaker capable of achieving
an improvement in sound pressure level even when the speaker is miniaturized, and its industrial
value is extremely large.
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