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JP2004048432

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DESCRIPTION JP2004048432
The present invention relates to a speaker used for various audio devices and information
communication devices, and it is an object of the present invention to reduce the thickness of the
speaker and to stabilize the frequency characteristic. A speaker according to the present
invention is provided with a recess 27a inside a connecting portion A of a diaphragm 27 with a
voice coil 28, and a distance between the connecting portion A with a voice coil 28 and the outer
periphery of the recess 27a At least a part thereof is to be nonuniform. With this configuration,
vibration transmission of the voice coil 28 on one circumference can be dispersed, and
concentration of acoustic energy can be reduced, so that stabilization of frequency characteristics
by resonance dispersion of the thin diaphragm can be realized. [Selected figure] Figure 2
スピーカ
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. A conventional
speaker will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a cross-sectional view of a
conventional speaker, and FIG. 7 is a plan view of a conventional diaphragm. The magnetic
circuit 4 is configured by sandwiching the magnet 1 magnetized as shown in FIGS. 6 and 7 by the
upper plate 2 and the yoke 3. The frame 6 is coupled to the yoke 3 of the magnetic circuit 4, and
the diaphragm 7 is bonded to the peripheral portion of the frame 6. The voice coil 8 coupled to
the diaphragm 7 is coupled so as to fit into the magnetic gap 5 of the magnetic circuit 4. Here, as
shown in FIG. 7, as for the shape of the diaphragm 7, a recess 7a is provided at the center of the
shape of the diaphragm 7 so that the overall height of the speaker can be set thin. SUMMARY OF
THE INVENTION The above-described speaker is intended to be thin, and in order to achieve
thinness, the overall height dimension of each component is designed to be small. However,
when the overall height of the diaphragm 7 is designed to be small, the shape rigidity is lowered,
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and there is a problem that unnecessary surface resonance of the diaphragm 7 occurs. The
present invention solves the above-mentioned problems, and suppresses the occurrence of
unnecessary surface resonance of the diaphragm. SUMMARY OF THE INVENTION In order to
solve the above-mentioned problems, the present invention has the following constitution. The
invention according to claim 1 of the present invention is characterized in that a recess is
provided on the inner side of the connecting portion of the diaphragm with the voice coil, and the
distance between the connecting portion and the outer periphery of the recess is at least a part of
one circumference. Is uneven. With this configuration, vibration transmission of the voice coil on
one circumference can be dispersed, and concentration of acoustic energy can be reduced, so
that stabilization of frequency characteristics by resonance dispersion of the thin diaphragm can
be realized. According to a second aspect of the present invention, the center of the connection
portion of the diaphragm with the voice coil is offset from the center of the inner recess. With
this configuration, vibration transmission of the voice coil on one circumference can be
dispersed, and concentration of acoustic energy can be reduced, so that stabilization of frequency
characteristics by resonance dispersion of the thin diaphragm can be realized.
According to a third aspect of the present invention, the planar shape of the concave portion is
set to an elliptical shape. With this configuration, vibration transmission of the voice coil on one
circumference can be dispersed, and concentration of acoustic energy can be reduced, so that
stabilization of frequency characteristics by resonance dispersion of the thin diaphragm can be
realized. According to a fourth aspect of the present invention, the planar shape of the recess is
set to a polygon. With this configuration, vibration transmission of the voice coil on one
circumference can be dispersed, and concentration of acoustic energy can be reduced, so that
stabilization of frequency characteristics by resonance dispersion of the thin diaphragm can be
realized. DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention
will be described below with reference to the drawings. First Embodiment The invention
according to the first aspect of the present invention will be described below with reference to
the first embodiment. FIG. 1 is a cross-sectional view of a loudspeaker according to an
embodiment of the present invention, and FIG. 2 is a plan view of a diaphragm. As shown in FIGS.
1 and 2, the magnetized circuit 21 is configured by sandwiching the magnetized magnet 21 by
the upper plate 22 and the yoke 23. A frame 26 is coupled to the yoke 23 of the magnetic circuit
24, a substantially disk-shaped diaphragm 27 is adhered to the frame 26, and a cylindrical voice
coil 28 coupled to the diaphragm 27 is a magnetic coil of the magnetic circuit 24. It is coupled so
as to fit in the gap 25. Here, the outer peripheral shape of the diaphragm 27 is substantially
circular as shown in FIG. 2, and a concave portion 27 a is provided inside the circular joint
portion A with the voice coil 28. The outer peripheral shape of the concave portion 27a is
indeterminate, and the distance to the joint portion A with the voice coil 28 is set so that at least
a part of one round becomes uneven. With this configuration, since the distance between the
joint A of the voice coil 28 and the outer periphery of the recess 27a differs depending on each
point on one circumference, vibration transmission can be dispersed, thereby reducing the
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concentration of acoustic energy. be able to. Therefore, since the peak and dip on the frequency
characteristic can be reduced, stabilization of the frequency characteristic by the resonance
dispersion can be realized even with a thin diaphragm. Further, as a secondary effect of
providing the recess 27 a inside the joint portion A with the voice coil 28, vibration is caused by
an excessive input being applied to the speaker or an external wind pressure being applied. At
this time, the bottom of the concave portion 27a of the system can be prevented from being
repelled by the fact that the bottom of the concave portion 27a abuts against the upper plate 22
when the system is not shifted back downward.
Second Embodiment The invention according to the second aspect of the present invention will
be described below with reference to a second embodiment. FIG. 3 shows a plan view of the
diaphragm 27 according to an embodiment of the present invention. A different point from the
first embodiment is the setting position of the recess 27 b of the diaphragm 27, in which the
center of the connecting portion A of the diaphragm 27 with the voice coil 28 and the center of
the inner recess 27 b are shifted. Also in this configuration, vibration transmission of the voice
coil 28 on one round can be dispersed, and concentration of acoustic energy can be reduced, so
that stabilization of frequency characteristics by resonance dispersion of the thin diaphragm 27
can be realized. Third Embodiment The invention according to the third aspect of the present
invention will be described below with reference to the third embodiment. FIG. 4 shows a plan
view of a diaphragm according to an embodiment of the present invention. A difference from the
first embodiment is the outer peripheral shape of the recess 27 c of the diaphragm 27, which is
set to be elliptical. With this configuration, stabilization of the frequency characteristics can be
realized by reducing unnecessary resonance of the diaphragm 27 while realizing thinning.
Further, since the outer peripheral shape of the concave portion 27c is set to be elliptical, the
production of the diaphragm 27 can also be easily created with a simple definition of the
production of the molding die being elliptical. Therefore, the production efficiency of the
production facility can also be improved. Fourth Embodiment The fourth embodiment of the
present invention will be described below with reference to the fourth aspect of the present
invention. FIG. 5 shows a plan view of a diaphragm according to an embodiment of the present
invention. A different point from the first embodiment is the outer peripheral shape of the recess
27 d of the diaphragm 27, which is set in a polygonal shape. In this embodiment, an example of a
square is shown. With this configuration, stabilization of the frequency characteristics can be
realized by reducing unnecessary resonance of the diaphragm 27 while realizing thinning.
Further, since the outer peripheral shape of the recess 27 d is set to a polygonal shape, the
production of the diaphragm 27 can also be easily created by the simple definition of the
production of the molding die as a polygon. Therefore, the production efficiency of the
production facility can also be improved. As described above, according to the speaker of the
present invention, the recess is provided inside the connecting portion of the diaphragm with the
voice coil, and the distance between the connecting portion with the voice coil and the outer
periphery of the recess is one round. At least a part of them is to be nonuniform.
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With this configuration, vibration transmission of the voice coil on one circumference can be
dispersed, and concentration of acoustic energy can be reduced, so that stabilization of frequency
characteristics by resonance dispersion of the thin diaphragm can be realized. As described
above, the present invention can provide an excellent speaker capable of realizing stable
frequency characteristics even with a thin speaker, and its industrial value is great. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a speaker according to an
embodiment of the present invention. FIG. 2 is a plan view of a diaphragm according to an
embodiment of the present invention. FIG. 4 is a plan view of a diaphragm according to another
embodiment of the present invention. FIG. 5 is a plan view of a diaphragm according to another
embodiment of the present invention. FIG. [Fig. 7] A plan view of a conventional diaphragm
[Description of symbols] 21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap
26 frame 27 diaphragm 27a to 27d recess 28 voice coil
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