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JP2007096436

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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 JP2007096436
The present invention relates to a damper used for a speaker, and it is an object of the present
invention to further enhance driving efficiency in a speaker with small distortion. In order to
achieve this object, according to the present invention, a damper 12 which is a component of a
speaker and is provided to suppress the rolling of a voice coil body 2 has a corrugated structure
10 on the inner circumference and The plate spring 11 of the outer peripheral portion is
configured to connect the corrugated structure 10 to the voice coil body 2 and to connect the
plate spring 11 to the frame 5. [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
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1
amplitude of the diaphragm 3 is vertically symmetrical, thereby reducing distortion in the
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]
Further, in order to achieve this object, the present invention provides a damper in which an
outer peripheral end is connected to the frame and an inner peripheral end is connected to the
voice coil body on the magnetic circuit side with respect to the diaphragm. The damper is
composed of a corrugated structure on the inner peripheral side and a leaf spring on the outer
peripheral side.
[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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2
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 the coil 2 b is wound around the outer
peripheral portion of the cylindrical main body 2 a and is disposed movably in the vertical
direction with respect to the magnetic gap 8. It has a structure to vibrate the diaphragm 3
connected to the outer peripheral portion.
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 to
apply the movable load to the diaphragm 3 as little as possible.
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3
[0012]
The damper 12 is composed of a corrugated structure 10 on the inner periphery and a flat
spring 11 on the outer periphery.
The inner peripheral end of the corrugated structure 10 is connected to the magnetic circuit 1
side of the voice coil body 2 fixed to the diaphragm 3 and the outer peripheral end of the
corrugated structure 10 is a separate plate-like plate spring 11. Is fixed, and the outer periphery
of the plate spring 11 is connected to the frame 5.
The corrugated structure 10 has a corrugated ring structure, which is configured to expand and
contract in response to the movement of the voice coil body 2 and, similarly to the edge 4
provided on the diaphragm 3, the diaphragm It is made of a material such as urethane, foam
rubber, SBR rubber or cloth so as not to apply movable load to 3 as much as possible.
[0013]
The voice signal is applied to the coil 2b of the voice coil body 2 to react with the magnetic field
of the magnetic gap 8 to move the voice coil body 2 in the vertical direction, and this movement
causes the diaphragm 3 to vibrate and the speaker emits a sound. In particular, by providing the
plate spring 11 at the outer peripheral end portion of the corrugated structure 10, distortion of
the speaker is suppressed, and the driving efficiency of the speaker is further enhanced.
[0014]
The damper 12 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, A corrugated corrugated structure 10 is provided to provide
elasticity.
[0015]
However, when the corrugated structure 10 in the form of a corrugated plate is provided, when
the amount of amplitude of the voice coil body 2 is small, movement of the voice coil body 2
hardly causes a large load, but the amount of amplitude of the voice coil body 2 is When the
value of becomes larger than a predetermined condition, the load is rapidly increased.
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[0016]
So, in this embodiment, the outer peripheral part of the corrugated structure part 10 is
connected to the flame | frame 5 via the leaf | plate spring 11, and if it does in this way, the
movable width of the voice coil body 2 will become large, The corrugated structure part 10
When the load becomes a load, stress is applied to the leaf spring 11, and the leaf spring 11 is
elastically deformed according to the stress.
[0017]
For this reason, even when the amplitude amount of the voice coil body 2 is increased as
described above, the amplitude is less likely to be inhibited by the damper 12, and the reduction
of the driving efficiency is suppressed.
[0018]
In the configuration in which the corrugated structure 10 is connected to the frame 5 via the
plate spring 11 as described above, as described above, it is corrugated until the movable width
of the voice coil body 2 is increased to a certain extent. The linearity of power linearity can be
secured by the corrugated structure 10, and the elasticity of the leaf spring 11 compensates for
the linearity when the movable width of the voice coil body 2 becomes more than a
predetermined value and the linearity becomes difficult to secure. Because of this, it is desirable
to set the elastic modulus of the leaf spring 11 to be larger (harder) than the elastic modulus of
the corrugated structure 10.
[0019]
Further, it is preferable that the corrugated structure 10 and the plate spring 11 have different
elastic moduli and be set so that both function independently according to the movable width of
the voice coil body 2. More specifically, the elastic modulus of the region between the plate
structure 11 and the plate spring 11 is set to be larger (harder) than that of the plate structure
11 and the plate spring 11. Can ensure independence between the two.
[0020]
When setting the elastic modulus of the connection region between the corrugated structure 10
and the plate spring 11 to be larger than the elastic modulus of the corrugated structure 10 and
the plate spring 11, for example, the adhesive for bonding the corrugated structure 10 and the
plate spring 11 Use hard adhesives such as acrylics as the type of agent, or integrate the
corrugated structure 10 and the flat spring 11 by insert molding to increase the thickness of the
part (hard) or paste a reinforcing material in the connection area To
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5
[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, the complex of the corrugated structure 10 and the plate
spring 11 described above is not only optimized but also It is desirable to define the relationship
between the composite of the corrugated structure 10 and the plate spring 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 composite of the
corrugated structure 10 and the flat spring 11 to be 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]
In addition, since the diaphragm 3, the voice coil body 2 and the corrugated structure 10 located
in the area surrounded by the edge 4 and the leaf spring 11 can be regarded as an integrated
rigid body, the distance between the edge 4 and the leaf spring 11 If it is increased, rolling of the
voice coil body 2 can be suppressed and distortion can be reduced.
[0024]
FIG. 2 shows another embodiment, in which the outer periphery of the corrugated structure 10 is
linearly extended to the lower side of the magnetic gap 8 and a plate spring 11 is provided there
and connected to the frame 5.
[0025]
In this way, the distance between the edge 4 and the leaf spring 11 is larger than that in FIG. 1,
and as a result, the effect of suppressing the rolling of the voice coil body 2 is further enhanced.
[0026]
INDUSTRIAL APPLICABILITY The present invention can reduce distortion of a speaker and
improve driving efficiency, and is particularly useful for a small-sized speaker.
[0027]
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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
[0028]
Reference Signs List 1 magnetic circuit 2 voice coil body 3 diaphragm 4 edge 5 frame 8 magnetic
gap 10 corrugated structure portion 11 plate spring 12 damper
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