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DESCRIPTION JP2003333686

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DESCRIPTION JP2003333686
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various acoustic devices and information communication devices such as mobile
phones.
[0002]
2. Description of the Related Art In recent years, with the miniaturization of electronic devices
such as portable information terminals, the miniaturization of speakers used therein is also
desired.
[0003]
FIG. 6 shows a conventional speaker.
The magnet 1 magnetized on the surface of the recess of the yoke 3 having the concave shape is
provided with the upper plate 2 on the surface of the magnet 1, and the peripheral surface of the
magnet 1 and the inner peripheral surface of the recess of the yoke 3 A magnetic gap 5 is
provided between them to constitute the magnetic circuit 4. A frame 16 is provided on the outer
peripheral surface of the yoke 3, and a diaphragm 7 provided so as to cover the upper plate 2 is
joined by a peripheral portion 16 a of the frame 16. A voice coil 8 is provided on the diaphragm
7 and one end of the voice coil 8 is movably disposed in the magnetic gap 5 of the magnetic
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circuit 4.
[0004]
In the above configuration, the method of reducing the size of the speaker, in particular, the
method of reducing the size of the speaker, includes a method of reducing the size of the frame
16 itself. In this case, the area of the movable diaphragm 7 is also There is a problem that a
reduction in sound pressure level is caused because of the smaller size.
[0005]
Therefore, an object of the present invention is to provide a speaker whose external dimensions
are reduced without lowering the sound pressure level.
[0006]
SUMMARY OF THE INVENTION In order to achieve this object, the invention according to claim
1 of the present invention has a magnetic circuit and one end movably disposed in a magnetic
gap provided in the magnetic circuit. A voice coil, a diaphragm connected to the other end of the
voice coil, and a frame connecting the peripheral portion of the diaphragm to the outer
peripheral surface of the magnetic circuit, the outer peripheral portion of the frame being the
inner peripheral edge The speaker has an angle with respect to the part, whereby the external
dimensions of the speaker can be reduced without changing the effective vibration dimension of
the diaphragm, and as a result, the speaker can be miniaturized without lowering the sound
pressure level. It has the effect of being able to
[0007]
The invention according to claim 2 of the present invention is the speaker according to claim 1,
wherein the angle of the outer peripheral edge of the frame is 10 to 90 degrees in the back
surface direction of the frame with respect to the inner peripheral edge, In addition to the effects
of item 1, when the speaker is incorporated in a set, the position of the diaphragm can be more
easily arranged on the front of the set, and as a result, the sound pressure level can be improved.
[0008]
The invention according to claim 3 of the present invention is the speaker according to claim 1,
wherein the angle of the outer peripheral edge of the frame is 10 to 90 degrees in the surface
direction of the frame with respect to the inner peripheral edge, In addition to the operation and
effect of the item 1, by providing the horn shape on the front surface of the diaphragm, there is
an operation and effect that the frequency characteristic can be adjusted as a speaker.
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[0009]
The invention according to claim 4 of the present invention is the speaker according to claim 1,
wherein the angle of the outer peripheral edge of the frame is 90 to 180 degrees with respect to
the inner peripheral edge of the frame in the back surface direction of the frame. In addition to
the effect of the item 1, the effect of improving the bonding strength between the diaphragm and
the frame can be achieved.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a speaker according to the
present invention will be described with reference to embodiments and the drawings.
The same parts as those of the conventional speaker are denoted by the same reference
numerals.
[0011]
(First Embodiment) The invention according to the first aspect of the present invention will be
described with reference to the first embodiment.
[0012]
FIG. 1 shows a cross-sectional view of the loudspeaker according to the first embodiment.
[0013]
According to FIG. 1, 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 diaphragm 7 is adhered to the
outer peripheral edge 6a of the frame 6, and the voice coil 8 whose other end is coupled to the
diaphragm 7 is the magnetic circuit The magnetic gap 5 is disposed movably.
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Here, the outer peripheral edge portion 6a of the frame 6 to which the diaphragm 7 is coupled is
configured to have an angle.
According to this configuration, since the effective vibration size of the diaphragm 7 can be
maintained, the external size of the speaker can be made as small as possible without lowering
the sound pressure level.
[0014]
Second Embodiment The invention according to the second aspect of the present invention will
be described with reference to the second embodiment.
[0015]
FIG. 2 shows a cross-sectional view of the loudspeaker according to the second embodiment.
[0016]
A different point from the first embodiment is that the angle of the outer peripheral edge 6a of
the frame 6 to which the diaphragm 7 is connected is configured in the range of 10 degrees to
90 degrees downward with respect to the inner peripheral edge 6b. .
[0017]
As shown in FIG. 2, in particular, when the angle is close to 90 degrees, the external dimensions
of the speaker can be as close as possible to the external dimensions of the diaphragm 7.
According to this configuration, since the effective vibration size of the diaphragm 7 can be
maintained, the external size of the speaker can be made as small as possible without lowering
the sound pressure level.
In addition, the sound pressure level can be improved by arranging the position of the diaphragm
7 on the front side.
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[0018]
Also, in the case where the angle is set to 90 degrees as shown in FIG. 2, the mounting screw can
be set to be tightened from the lateral direction also for the attachment of the speaker to the set,
and the set is included. It is also possible to reduce the size.
[0019]
The contents other than the above contents are the same as those of the first embodiment, and
therefore the description will be omitted.
[0020]
Third Embodiment The third embodiment of the present invention and the third embodiment of
the present invention will be described below with reference to the third embodiment and FIGS.
[0021]
FIG. 3 shows a cross-sectional view of the loudspeaker according to the third embodiment.
[0022]
What differs from the first embodiment is that the angle of the outer peripheral edge 6a of the
frame 6 to which the diaphragm 7 is connected is configured to have an angle in the range of 10
degrees to 90 degrees upward with respect to the inner peripheral edge 6b. It is.
[0023]
The bonding portion between the diaphragm 7 and the frame 6 is provided on the same side as
the diaphragm 7.
[0024]
With this configuration, the external dimension of the speaker can be made close to the effective
vibration dimension of the diaphragm 7.
Moreover, by arranging the position of the diaphragm 7 on the rear surface, adjustment of the
frequency characteristic as a speaker can be performed by providing the horn shape on the front
surface.
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[0025]
In addition, when the angle is set to 90 degrees, the mounting screw can be set to be tightened
from the lateral direction even when the speaker is attached to the set, thereby achieving
downsizing including the set. It also becomes possible.
[0026]
FIG. 4 differs from FIG. 3 in that the bonding portion between the diaphragm 7 and the frame 6
is provided on the opposite side of the diaphragm 7.
According to this configuration, since the effective vibration dimension of the diaphragm 7 can
be maintained, the external dimension of the speaker can be reduced without lowering the sound
pressure level.
In addition, the bonding strength between the diaphragm 7 and the frame 6 can be improved,
and as a result, the sound pressure level can be improved.
[0027]
The contents other than the above contents are the same as those of the first embodiment, and
therefore the description will be omitted.
[0028]
(Fourth Embodiment) The fourth embodiment of the present invention will be used to explain the
fourth aspect of the present invention.
[0029]
FIG. 5 shows a cross-sectional view of the loudspeaker of the fourth embodiment.
[0030]
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The difference from the first embodiment is that the angle of the outer peripheral edge 6a of the
frame 6 to which the diaphragm 7 is connected is configured to have an angle in the range of 90
degrees to 180 degrees downward with respect to the inner peripheral edge 6b. It is a thing.
According to this configuration, since the effective vibration size of the diaphragm 7 can be
maintained, the external size of the speaker can be made as small as possible without lowering
the sound pressure level.
In addition, the bonding strength between the diaphragm 7 and the frame 6 can be improved,
and as a result, the sound pressure level can be improved.
[0031]
The contents other than the above contents are the same as those of the first embodiment, and
therefore the description will be omitted.
[0032]
As described above, according to the present invention, there is provided a magnetic circuit, a
voice coil having one end movably disposed in a magnetic gap provided in the magnetic circuit,
and a voice coil coupled to the other end of the voice coil. A speaker comprising: a diaphragm;
and a frame connecting a peripheral portion of the diaphragm and an outer peripheral surface of
the magnetic circuit, the outer peripheral portion of the frame having an angle with respect to
the inner peripheral portion, As a result, the external dimensions of the speaker can be reduced
without changing the effective vibration size of the diaphragm, and as a result, the speaker can
be miniaturized without lowering the sound pressure level.
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