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JP2003209897

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DESCRIPTION JP2003209897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker.
[0002]
2. Description of the Related Art Track-shaped (elliptical, oval, etc.) speakers having different
ratios of the long axis (long axis) and the short axis (short axis) have been used in various
acoustic devices. Hereinafter, a conventional track-shaped speaker will be described with
reference to FIG. Fig.2 (a) is a front view which shows an example of the speaker of a passive
structure. Moreover, FIG.2 (b) is sectional drawing (sectional drawing of a longitudinal direction)
along the BB line shown to Fig.2 (a).
[0003]
As shown, the speaker includes a diaphragm 91 having a substantially oblong front shape, a
damper 92 for holding the diaphragm 91, a dust cap 93, a screw 94 serving as a weight, a nut
95, and a frame 96. And including. That is, weights (screws 94 and nuts 95) are attached to the
center of the speaker, and only one damper 92 is present at the center.
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1
[0004]
The speaker of such a configuration transmits vibration from an external device and emits a
sound corresponding to the transmitted vibration. That is, since the speaker has a simple
configuration without a drive system such as a coil inside, it can be manufactured at low cost. In
addition, there is also an advantage of space saving as compared with a normal speaker having a
circular front shape.
[0005]
However, the conventional speaker as shown in FIG. 2 has a problem that linear operation is
difficult at the time of large input and the sound quality is deteriorated. This is because the
diaphragm 91 has a substantially oval shape, and the ratio of the major axis to the minor axis is
largely different, which causes the distance from the central axis to the outer peripheral portion
of the diaphragm 91 to be nonuniform. ing. Specifically, a phenomenon such as rolling occurs,
which is considered to be unsuitable for a speaker system with high sound quality and high input
resistance.
[0006]
The present invention has been made in view of the above problems, and it is an object of the
present invention to provide a speaker with high sound quality and high input tolerance.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, a speaker according to a
first aspect of the present invention is a speaker having a diaphragm having a substantially
oblong front shape, the diaphragm having a circular shape A plurality of megaphones having an
opening and a flat part having a figure of eight connecting the openings of the megaphone are
integrally formed.
[0008]
The diaphragm may be held by a reinforcing member having a flat surface having substantially
the same shape as the flat portion.
[0009]
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The diaphragm may be held by a damper together with the reinforcing member.
[0010]
In order to achieve the above object, a speaker according to a second aspect of the present
invention is a speaker having a diaphragm whose front shape is formed in a track shape, and the
diaphragm has a circular opening. Of the flat portion of the diaphragm, wherein eight
megaphones and an eight-shaped flat connecting the openings of the megaphone are integrally
formed, and an eight-shaped reinforcement held via a damper is used. It is characterized in that it
is fixed to the back side.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described with reference to FIG. 1 by taking a speaker of a passive structure as an example.
FIG. 1A is a front view showing an example of a loudspeaker according to an embodiment of the
present invention.
Moreover, FIG.1 (b) is sectional drawing (sectional drawing of a longitudinal direction) along the
AA shown to Fig.1 (a).
[0012]
As shown, this speaker includes a diaphragm 1, a ring 2, a first damper 3, a second damper 4, a
cylinder 5, a dust cap 6, a screw 7, a nut 8, and a frame And 9 are configured.
[0013]
The diaphragm 1 has a track shape (substantially oval) in front view, and two megaphone parts
having circular openings and an eight-shaped flat part connecting the openings (peripheries) of
the megaphone parts are integrated. It is formed.
The diaphragm 1 is fixed to the ring 2 on the back surface of the flat portion.
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[0014]
The ring 2 is an 8-shaped reinforcing member similar to the flat portion of the diaphragm 1 and
one surface (upper surface) is fixed to the back surface of the flat portion of the diaphragm 1 and
holds the diaphragm 1 .
Further, the other surface (lower surface) of the ring 2 is fixed to the first damper 3.
[0015]
The first dampers 3 are disposed corresponding to the sums in the ring 2 (two sums in the figure
of eight), and hold the diaphragm 1.
Specifically, the first damper 3 is fixed to the lower surface of the ring 2 and fixed to the bottom
of the megaphone portion of the diaphragm 1 with a screw 7 and a nut 8.
[0016]
The second dampers 4 are respectively fixed on the chassis 9 facing the first damper 3 and hold
the cylinder 5.
[0017]
The tube 5 is a U-shaped cross section, and is disposed corresponding to the megaphone portion
of the diaphragm 1.
Specifically, the upper part of the cylinder 5 is fixed to the first damper 3 by the screw 7 and the
nut 8, and the lower part is fixed to the second damper 4.
[0018]
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The dust caps 6 are arranged to cover the bottom of the megaphone portion of the diaphragm 1
from the front.
[0019]
The screws 7 and the nuts 8 are disposed at the center (the center of the bottom) of the
respective megaphones as weights in the diaphragm 1.
Then, the screw 7 and the nut 8 clamp the diaphragm 1, the first damper 3 and the cylinder 5
together.
Specifically, the screw 7 penetrates the bottom of the megaphone portion of the diaphragm 1, the
first damper 3, and the upper surface of the cylinder 5, and is screwed with the nut 8.
[0020]
The chassis 9 is a housing having a substantially oval opening, and holds the above-described
diaphragm 1 and the like.
[0021]
The speaker having the above-described configuration transmits vibration from an external
device and emits a sound corresponding to the transmitted vibration.
That is, although the diaphragm 1 vibrates to emit sound, good sound quality is secured at that
time.
[0022]
That is, in the diaphragm 1, since each central axis centering on the megaphone portion to the
outer peripheral end is substantially equidistant over the entire circumference, the whole
diaphragm 1 can be properly balanced. And since ring 2 works also as a rib which reinforces
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diaphragm 1, even at the time of big input, modification of diaphragm 1 can be controlled and
diaphragm 1 can be operated linearly. As a result, a speaker with high sound quality and high
input tolerance can be realized.
[0023]
Further, by providing the ring 2 and the cylinder 5 in a manner of overlapping the diaphragm 1,
deformation of the diaphragm 1 can be prevented by the rib effect, and a good vibration state
can be secured.
[0024]
Further, since the first damper 3 is not fixed to the frame 9, smooth vibration of the diaphragm 1
can be secured.
[0025]
In the above embodiment, although the case where the diaphragm 1 is formed to include two
megaphone portions is described as an example, even if the diaphragm is formed to include three
or more megaphone portions, etc. The same effect can be obtained.
[0026]
Although the above-mentioned embodiment explained the speaker of passive structure as an
example, it is applicable suitably also to the speaker provided with drive systems, such as a coil,
besides it.
[0027]
As described above, according to the present invention, a speaker with high sound quality and
high input tolerance can be realized.
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