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JP2007110208

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2007110208
An object of the present invention is to increase the output of a low distortion speaker. A frame
5, a magnetic circuit 1 supported by the frame 5, a voice coil body 2 movably disposed with
respect to a magnetic gap 8 provided in the magnetic circuit 1, an outer peripheral end portion A
diaphragm 3 connected to the frame 5 via the first edge 4 and having an inner peripheral end
directly or indirectly connected to the voice coil body 2, and the magnetic circuit 1 side from the
diaphragm 3 And a suspension holder 10 having an outer peripheral end connected to the frame
5 via the second edge 7 and an inner peripheral end directly or indirectly connected to the voice
coil body 2; The magnetic circuit 1 sets the movable space 1d of the voice coil body 2 on the
back side of the magnetic gap 8 in which the voice coil body 2 is movable, with the projecting
directions of the first and second edges 4 and 7 being reverse directions. In the movable space
1d The wall surface, is provided with a vent 1e to the outside of the movable space 1d. [Selected
figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
In the conventional speaker, as shown in FIG. 5, the voice coil body 2 movably disposed in the
magnetic circuit 1 is connected to the inner peripheral end of the diaphragm 3, and the outer
peripheral end of the diaphragm 3 is connected via the edge 4. The diaphragm 3 is connected to
the frame 5, and the back surface of the diaphragm 3 is connected to the frame 5 via the
suspension holder 6 and the edge 7.
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[0003]
Further, by making the projecting directions of the edges 4 and 7 opposite to make the vertical
amplitude of the diaphragm 3 vertically symmetrical, distortion in the speaker is reduced.
[0004]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP, 2004-7332, A
[0005]
According to the speaker of FIG. 5 as described above, since the upper and lower amplitudes of
the diaphragm 3 are vertically symmetrical by using the edges 4 and 7 and making the
protruding direction opposite, the output as a speaker Even if the diaphragm 3 vibrates up and
down to increase the distortion, the distortion is reduced.
[0006]
However, when the vibration of the diaphragm 3 is increased, distortion may occur in the
vibration of the diaphragm 3 due to another factor.
[0007]
That is, in order to cause the diaphragm 3 to vibrate largely, a large current is supplied to the coil
2a of the voice coil body 2 located in the magnetic gap 8 to cause the voice coil body 2 to largely
vibrate and vibrate the diaphragm 3 as well. .
[0008]
However, when the voice coil body 2 is going to be greatly lowered in the lower part of FIG. 5,
the air in the movable space 1 d of the voice coil body 2 in the back of the magnetic gap 8 is
compressed. In the case of No. 2, it was not possible to lower smoothly, and this caused
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distortion in the vibration of the diaphragm 3.
This tendency becomes more pronounced as the diaphragm 3 is made to vibrate largely at high
power.
[0009]
Therefore, an object of the present invention is to reduce distortion at high output.
[0010]
And in order to achieve this object, according to the present invention, a frame, a magnetic circuit
supported by the frame, a voice coil body movably disposed with respect to a magnetic gap
provided in the magnetic circuit, and an outer periphery A diaphragm connected at one end to
the frame via the first edge and an inner peripheral end directly or indirectly connected to the
voice coil body, and provided on the magnetic circuit side from the diaphragm A suspension
holder whose outer peripheral end is connected to the frame via the second edge and whose
inner peripheral end is connected directly or indirectly to the voice coil body; The magnetic
circuit has the movable space of the voice coil body on the back side of the magnetic gap where
the voice coil body is movable, and the magnetic circuit has the movable space outside the
movable space on the wall surface in contact with the movable space. It is provided with a vent
hole.
[0011]
In the above configuration, when a large current is applied to the coil of the voice coil body
located in the magnetic gap portion in order to cause the diaphragm to vibrate largely, the voice
coil body is largely moved, whereby the voice in the back of the magnetic gap The air in the
movable space of the coil body is pushed out of the movable space through the vent hole by the
entry of the voice coil body.
[0012]
As a result, the voice coil can move smoothly even at this large output, and the occurrence of
distortion in the vibration of the diaphragm is extremely reduced.
[0013]
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Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
In addition, about the structure similar to the structure mentioned above as background art, the
same code | symbol is attached | subjected and demonstrated.
[0014]
FIG. 1 is a cross-sectional view and a front view of the main part of the loudspeaker according to
the present invention, and the magnetic circuit 1 disposed at the center of the bottom of the
mortar-shaped frame 5 comprises a disc magnet 1a, a disc plate 1b and a disc It is formed by
combining and bonding yokes 1 c having a shape in which a cylinder protruding upward at the
center is provided.
A magnetic gap 8 opened upward in the magnetic circuit 1 is formed between the outer
peripheral side surface of the side wall portion of the yoke 1c and the inner peripheral side
surface of the plate 1b.
[0015]
Further, the voice coil body 2 has a cylindrical shape, and the coil 2a is wound around the outer
periphery thereof, and is disposed movably in the vertical direction with respect to the magnetic
gap 8, and the upper outer periphery of the voice coil body 2 The structure is such that the
diaphragm 3 connected to the part is vibrated up and down.
At the upper end portion of the voice coil body 2, a dust cap 9 is provided as a dustproof
measure.
[0016]
The diaphragm 3 is a part to be a sound source of the speaker, and is mainly made of pulp and
resin having both high rigidity and internal loss. The outer peripheral end portion of the
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diaphragm 3 is a frame through an edge 4 projecting upward. It is connected to the open end
portion 5 and the inner peripheral end portion is fixed to the outer peripheral surface of the
voice coil body 2.
The edge 4 is formed of a material such as urethane, foam rubber, SBR rubber, cloth or the like
so as not to apply a movable load to the diaphragm 3 as much as possible.
[0017]
Further, on the magnetic circuit 1 side from the diaphragm 3, a disc-shaped suspension holder
10 whose middle part protrudes upward is provided.
The suspension holder 10 is connected at its outer peripheral end to the frame 5 via the edge 7
and the middle upper protrusion is in contact with one surface (lower surface side) of the
diaphragm 3 on the magnetic circuit side, The inner peripheral portion is fixed to the outer
peripheral surface of the voice coil body 2 by the unshown.
[0018]
The edge 7 is also formed of a material such as urethane, foam rubber, SBR rubber or cloth so as
not to apply the movable load to the diaphragm 3 as much as possible.
[0019]
Further, the projecting directions of the edges 4 and 7 are opposite to each other, and the edges
4 and 7 have a substantially line symmetrical shape at the boundary between the two.
This is to prevent a difference in vertical motion from being affected by the edges 4 and 7 when
the diaphragm 3 vibrates in the vertical direction, thereby reducing distortion.
[0020]
The magnetic circuit 1 is composed of the magnet 1a, the plate 1b, and the yoke 1c as described
above. In the magnetic circuit 1, the back side of the magnetic gap 8 in which the voice coil body
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2 is movable (this embodiment) Then, there is a movable space 1d of the voice coil body 2 in the
lower part, and the disk-shaped magnet 1a in contact with the movable space 1d has four vents
1e to the outside of the movable space 1d at 90 degree intervals. Provided in
[0021]
In the above configuration, when a large current is supplied to the coil 2a of the voice coil body 2
located in the magnetic gap 8 in order to cause the diaphragm 3 to vibrate largely, the voice coil
body 2 moves largely up and down. The diaphragm 3 also vibrates to a large extent, and a high
output sound is emitted.
[0022]
At this time, the diaphragm 3 is supported by the edges 4 and 7 whose direction of protrusion is
the reverse direction, and since these edges 4 and 7 have a substantially line symmetrical shape
at the boundary between them, the diaphragm 3 is vertically When vibrating in the direction, the
difference in vertical movement is less likely to occur, thereby reducing distortion.
[0023]
Further, in the present embodiment, the air hole 1e to the outside of the movable space 1d is
provided on the wall of the magnet 1a in contact with the movable space 1d, so the voice coil in
the back side of the magnetic gap 8 (downward in this embodiment) The air of the movable space
1d of the body 8 is pushed out of the movable space 1d through the vent hole 1e by the entry of
the voice coil body.
[0024]
As a result, even when the voice coil body 2 moves up and down greatly at the time of the large
output, the voice coil body 2 can be smoothly moved, and the occurrence of distortion in the
vibration of the diaphragm 3 is extremely reduced.
[0025]
In the present embodiment, the vent holes 1e to the outside of the movable space 1d are
provided in the wall of the magnet 1a as described above, but a plurality of vent holes may be
provided in the plate 1b in the outer peripheral portion of the magnetic gap 8 in FIG.
[0026]
FIG. 2 shows another embodiment of the present invention. In this embodiment, the magnet 1a is
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of the internal magnet type, and the cylindrical yoke 1c is provided with the vent holes 1e.
[0027]
That is, in the present embodiment, since the vent hole 1e to the outside of the movable space 1d
is provided on the wall surface of the yoke 1c in contact with the movable space 1d, the voice
coil body 2 at the back side of the magnetic gap 8 (downward in this embodiment) The air in the
movable space 1 d is pushed out of the movable space 1 d through the vent hole 1 e by the entry
of the voice coil body 2.
As a result, even when the voice coil body 2 moves up and down greatly at the time of the large
output, the voice coil body 2 can be smoothly moved, and the occurrence of distortion in the
vibration of the diaphragm 3 is extremely reduced.
[0028]
FIG. 3 shows another embodiment of the present invention. In this embodiment, the magnet 1a is
of the internal magnet type, and a vent hole 1e is provided in the central cylindrical portion 1f of
the cylindrical yoke 1c.
[0029]
That is, in the present embodiment, the vent hole 1e to the outside of the movable space 1d is
provided on the wall surface of the central cylindrical portion 1f of the yoke 1c in contact with
the movable space 1d.
[0030]
The vent holes 1e are opened horizontally at four points on the wall surface of the central
cylindrical portion 1f at equal intervals of 90 degrees, and then open at the center of the bottom
of the central cylindrical portion 1f.
[0031]
Further, an opening 5a is provided in the bottom of the frame 5 corresponding to the opening at
the center of the bottom of the central cylindrical portion 1f.
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[0032]
Therefore, the air in the movable space 1d of the voice coil body 2 at the back side (downward in
this embodiment) of the magnetic gap 8 is out of the movable space 1d through the vent hole 1e
and the opening 5a by the entry of the voice coil body 2. It will be pushed out.
As a result, even when the voice coil body 2 moves up and down greatly at the time of the large
output, the voice coil body 2 can be smoothly moved, and the occurrence of distortion in the
vibration of the diaphragm 3 is extremely reduced.
[0033]
FIG. 4 shows another embodiment of the present invention. In this embodiment, the magnet 1a is
of the internal magnet type, and a vent hole 1e is provided at the bottom of the cylindrical yoke
1c.
[0034]
That is, in the present embodiment, the vent hole 1e to the outside of the movable space 1d is
provided on the bottom wall surface of the yoke 1c in contact with the movable space 1d.
[0035]
Further, an opening 5b is also provided on the bottom surface of the frame 5 corresponding to
the vent hole 1e.
[0036]
Therefore, the air in the movable space 1d of the voice coil body 2 at the back side (downward in
this embodiment) of the magnetic gap 8 is out of the movable space 1d through the vent hole 1e
and the opening 5b by the entry of the voice coil body 2. It will be pushed out.
As a result, even when the voice coil body 2 moves up and down greatly at the time of the large
output, the voice coil body 2 can be smoothly moved, and the occurrence of distortion in the
vibration of the diaphragm 3 is extremely reduced.
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[0037]
INDUSTRIAL APPLICABILITY The present invention can reduce distortion of a speaker and can
also drive a diaphragm with a large output, and is useful for a high output, low distortion
speaker.
[0038]
(A) and (b) are a cross-sectional view of the speaker according to an embodiment of the present
invention and a front view of the main part (a) and (b) are a cross-sectional view and a front view
of the main part of the speaker according to another embodiment of the present invention (B) is a
cross-sectional view of the speaker according to another embodiment of the present invention
and a front view of the main part (a) and (b) is a cross-sectional view of the speaker according to
another embodiment of the present invention and a main part bottom view Figure
Explanation of sign
[0039]
DESCRIPTION OF SYMBOLS 1 magnetic circuit 1a magnet 1b plate 1c yoke 1d movable space 1e
vent 2 voice coil body 3 diaphragm 4 edge 5 frame 8 magnetic gap 10 suspension holder
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