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DESCRIPTION JP2007088674

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DESCRIPTION JP2007088674
The present invention relates to a speaker, and it is an object of the present invention to further
enhance driving efficiency in a speaker with small distortion. An edge 11 is provided on an outer
peripheral portion of a damper 10 which is a component of a speaker and is provided to
suppress rolling of a voice coil body 2 and is connected to a frame 5 via the edge 11 . The edge 4
of the diaphragm 3 and the edge 11 of the damper 10 are in the opposite direction of protrusion,
and the edge 11 is smaller than the edge 4. [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. 3, 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 through the edge 4. It is connected to the frame 5 and
further, the back surface of the diaphragm 3 is connected to the frame 5 via the suspension
holder 6 and the edge 7.
Further, by making the projecting shapes of the edges 4 and 7 in opposite directions, the vertical
amplitude of the diaphragm 3 is vertically symmetrical, thereby reducing distortion in the
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speaker.
[0003]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known. JP, 2004-7332, A
[0004]
However, in the case of adopting such a speaker structure, the suspension holder 6 is formed of a
rigid body of at least the same extent as the diaphragm 3, and hence the driving load in the
magnetic circuit 1 is increased due to this. It has been difficult to improve the driving efficiency
of the speakers.
[0005]
Then, an object of the present invention is to further enhance the driving efficiency in a low
distortion speaker.
[0006]
And in order to achieve this object, according to the present invention, a damper which is a
component of the speaker and is provided to suppress the rolling of the voice coil body is
connected to the frame through the second edge. The second edge is smaller than the first edge
connecting the outer peripheral portion of the diaphragm to the frame.
[0007]
With this configuration, distortion of the speaker can be suppressed and driving efficiency can be
improved.
[0008]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
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In addition, about the structure similar to the structure mentioned above as background art, the
same code | symbol is attached | subjected and demonstrated.
[0009]
FIG. 1 is a cross-sectional view showing a loudspeaker according to the present invention, in
which a magnetic circuit 1 disposed at the center of the bottom of a mortar-shaped frame 5 is
combined with a disk magnet 1a, a disk plate 1b and a cylindrical yoke 1c. A magnetic gap 8
opened toward the upper surface side of the magnetic circuit 1 is formed between the inner
peripheral side surface of the side wall portion of the yoke 1c and the outer peripheral side
surface of the plate 1b.
[0010]
Further, the voice coil body 2 has a structure in which a coil (not shown) is wound around the
outer peripheral portion of the cylindrical main body 2a, and is disposed movably in the upper
direction with respect to the magnetic gap 8. The diaphragm 3 connected to the upper outer
peripheral portion of the body 2 is vibrated.
At the upper end portion of the voice coil body 2, a dust cap 9 is provided as a dustproof
measure.
[0011]
The diaphragm 3 is a portion serving as a sound source of the speaker, and is mainly made of
pulp and resin having both high rigidity and internal loss, and the frame 5 through the edge 4
with the outer peripheral end protruding upward. The inner peripheral end portion is fixed to the
voice coil body 2.
The edge 4 is formed of a material such as urethane, foam rubber, SBR rubber or cloth so as not
to apply a movable load to the diaphragm 3.
[0012]
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The inner peripheral end of the damper 10 is connected to the magnetic circuit 1 side of the
voice coil body 2 with respect to the diaphragm 3 fixing portion, and the outer peripheral end is
separated from the damper 10 via the downwardly projecting edge 11. Connected to frame 5
The damper 10 has a corrugated plate-like ring structure (corrugated structure), and has a
structure that can expand and contract in response to the movement of the voice coil body 2 and
vibrates in the same manner as the edge 4 provided on the diaphragm 3. It is formed of a
material such as urethane, foam rubber, SBR rubber or cloth so as not to apply a movable load to
the plate 3.
[0013]
Then, by applying an audio signal to the coil of the voice coil body 2, the voice coil body 2 is
moved in the vertical direction by reacting with the magnetic field of the magnetic gap 8, the
diaphragm 3 vibrates by this movement and sound is emitted from the speaker In particular, by
providing the edge 11 at the outer peripheral end portion of the damper 10, distortion of the
speaker is suppressed, and further, the driving efficiency of the speaker is enhanced.
[0014]
The damper 10 is originally connected at its both ends to the frame 5 and the voice coil body 2
to suppress rolling when the voice coil body 2 is movable, and to make it easy to follow the
movement of the voice coil body 2 It has a plate-like shape and elasticity.
[0015]
However, due to the corrugated plate shape, when the amplitude amount is small, the load on
moving the voice coil body 2 is not a large load, but as the amplitude amount of the voice coil
body 2 increases, the load increases. I will.
[0016]
Therefore, in the present embodiment, the outer peripheral portion of the damper 10 is
connected to the frame 5 via the edge 11. If this is done, the movable width of the voice coil body
2 becomes large, and the damper 10 becomes a load. At this time, stress is applied to the edge
11, and the edge 11 is elastically deformed according to this stress.
[0017]
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Therefore, even when the amount of amplitude of the voice coil body 2 is increased as described
above, the amplitude is less likely to be inhibited by the damper 10, and a decrease in drive
efficiency is suppressed.
Further, when the edge 11 starts to be deformed, the edge 11 and the edge 4 have their
protruding directions opposite to each other, so that there is no large difference in the load with
respect to the vibration of the diaphragm 3 up and down.
And thus, the edge 10 is provided on the damper 10 to suppress the increase of the vibration
load, and the edges 4 and 11 are made to project in the opposite direction between the two and it
is difficult to make a difference in the vibration load in the vertical direction. Thus, a low
distortion speaker can be obtained.
[0018]
In the configuration in which the damper 10 is connected to the frame 5 via the edge 11 as
described above, the wave plate-like damper 10 is used until the movable width of the voice coil
body 2 is increased to some extent as described above. Since the linearity of power linearity can
be secured, and when the movable width of voice coil body 2 becomes a predetermined value or
more and it becomes difficult to secure the linearity, the elasticity of edge 11 compensates for
the linearity, so that the edge The elastic modulus of 11 is preferably set to be larger (harder)
than the elastic modulus of the damper 10.
[0019]
Further, it is desirable that the damper 10 and the edge 11 have different elastic moduli and be
set so that both function independently according to the movable width of the voice coil body 2,
and between the damper 10 and the edge 11, More specifically, in the connection area between
the damper 10 and the edge 11, the independence of both can be secured by setting the elastic
modulus of the area to be larger (harder) than the elastic modulus of the damper 10 and the edge
11.
[0020]
When setting the elastic modulus of the connection area between the damper 10 and the edge
11 to be larger (harder) than the elastic modulus of the damper 10 and the edge 11, for example,
the type of adhesive for bonding the edge 11 and the damper 10 is acrylic. Or the edge 11 and
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the damper 10 are integrated by insert molding to increase the thickness of the portion, or a
reinforcement material is attached to the connection area.
[0021]
In addition, in order to ensure the linearity of the power linearity of the diaphragm 3 which is the
sound generation area of the speaker, not only the complex of the damper 10 and the edge 11
described above is optimized but also the damper 10 and the edge It is desirable to define the
relationship between the composite of 11 and the edge 4 provided on the diaphragm 3.
[0022]
That is, what is important in this relationship is how freely and evenly the vibration plate 3
serving as a substantial sound source of the speaker can vibrate up and down. When this point is
considered, the vibration plate 3 It is desirable to set the elastic modulus of the complex of the
damper 10 and the edge 11 substantially equal to the elastic modulus of the edge 4 provided on
the diaphragm 3 in order to make the best use of the linearity in.
[0023]
Therefore, in the present embodiment, the edge 11 is smaller than the edge 4 as shown in FIG.
[0024]
That is, since the damper 10 has a corrugated structure and a small elastic modulus (soft), the
elastic modulus is increased (hardened) by making the edge 11 smaller than the edge 4, whereby
the elastic modulus of the composite of the edge 11 and the damper 10 , And approximately
equal to the edge 4.
[0025]
In addition, since the diaphragm 3, the voice coil body 2 and the damper 10 located in the region
surrounded by the upper and lower edges 4 and 11 can be regarded as an integrated rigid body,
the voice coil can be obtained by increasing the distance between the edges 4 and 11 Since the
rolling of the body 2 can be suppressed and distortion can be reduced, the edge 4 is projected to
the opposite side to the damper 10 and the edge 11 to the opposite side to the diaphragm 3 in
order to secure the distance between the edges 4 and 11 The interval can be secured by setting
so as to protrude.
[0026]
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Furthermore, as shown in FIG. 2, the outer peripheral end portion of the damper 10 is bent
downward, and the connection position of the edge 11 and the frame 5 is set lower than the
plate 1 b located at the upper end of the magnetic circuit 1. The area of the magnetic gap 8 that
is the drive point of the voice coil body 2 is included in the area that can be regarded as a rigid
body in which the diaphragm 3, voice coil body 2 and damper 10 are integrated as described
above. It will be possible.
[0027]
INDUSTRIAL APPLICABILITY The present invention can reduce distortion of a speaker and
improve driving efficiency, and is particularly useful for a small-sized speaker.
[0028]
Cross-sectional view of a loudspeaker according to an embodiment of the present invention
Cross-sectional view of a loudspeaker according to another embodiment of the present invention
Cross-sectional view of a conventional loudspeaker
Explanation of sign
[0029]
1 magnetic circuit 2 voice coil body 3 diaphragm 4 (first) edge 5 frame 8 magnetic gap 10
damper 11 (second) edge
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