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DESCRIPTION JP2011244296

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DESCRIPTION JP2011244296
An object of the present invention is to provide a speaker for use in various types of audio
equipment, in which a countermeasure is taken to prevent an abnormal sound generated when a
voice coil contacts a magnetic gap. SOLUTION: A corrugation, an adhesion part for coupling with
a voice coil of a speaker on the inner periphery thereof, and an adhesion part for coupling to a
frame of a speaker on an outer periphery of the corrugation are provided. By forming portions of
different material thickness in the corrugation, the reinforcement effect of the portions of
different material thickness suppresses movement of the voice coil other than in the vertical
direction, thereby enhancing central retention force. Even in the case of large amplitude, the
voice coil is prevented from coming into contact with the magnetic gap to generate an abnormal
sound. [Selected figure] Figure 2
Speaker damper and speaker using the same
[0001]
TECHNICAL FIELD The present invention relates to a speaker damper used for various audio
devices and a speaker using the same.
[0002]
A conventional speaker damper will be described using the drawings.
[0003]
FIG. 6 is a plan view of a conventional speaker damper, and FIG. 7 is a cross-sectional view of the
conventional speaker damper. The speaker damper 17 has a roll-shaped cross section of the
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corrugation 17a.
[0004]
Here, the speaker damper 17 is connected to a corrugation 17a whose cross-sectional shape is a
roll type, an adhesive portion 17b for coupling to the voice coil of the speaker on its inner
periphery, and a speaker frame on the outer periphery of the corrugation 17a. And a flat portion
17c, which is an adhesive portion for the purpose.
[0005]
The speaker damper 17 having a roll-shaped cross-sectional shape of the corrugation 17a can
realize a large amount of amplitude, particularly while the external shape of the damper is
reduced, as compared to a speaker damper having a corrugated corrugation. In small-sized
speakers with many area restrictions and slim-type speakers that need to reduce the short
diameter size, a large amount of amplitude can be secured, and it has been widely used because
good linearity can be realized.
[0006]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
[0007]
Unexamined-Japanese-Patent No. 10-322795
[0008]
The speaker damper having a roll-shaped cross-sectional shape of the conventional corrugation
can realize a large amount of amplitude while keeping the external size of the damper small, but
as its drawback, the center holding power of the voice coil is weak. At the time of large
amplitude, the voice coil is in contact with the magnetic gap and has a problem that it is easy to
generate an abnormal sound.
[0009]
The cause of this is that a speaker damper having a roll-shaped cross section of the conventional
corrugation can secure a large amount of amplitude and further reduce the weight of the damper
as much as possible due to the need to improve the sound pressure level of the speaker As
described above, since the thickness of the material is set as thin as possible, the center holding
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power of the voice coil is inevitably weakened.
[0010]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems,
and in a small speaker and a slim type speaker which needs to reduce the short diameter
dimension, the central holding power of the voice coil is enhanced at large amplitude while
reproducing rich bass by large amplitude. It is an object of the present invention to provide a
speaker capable of preventing the voice coil from coming into contact with the magnetic gap to
generate an abnormal sound.
[0011]
In order to solve the above problems, the speaker damper of the present invention includes a
corrugation, an adhesive portion for coupling with the voice coil of the speaker on the inner
periphery thereof, and an adhesive portion for coupling to the frame of the speaker on the outer
periphery of the corrugation , And the cross-sectional shape of the corrugation is formed in a roll
shape, and portions having different material thicknesses are formed.
[0012]
With this configuration, the reinforcement effect of forming the portions with different material
thicknesses suppresses the movement of the voice coil other than in the vertical direction and
strengthens the center retention force, and the voice coil becomes a magnetic gap even at large
amplitudes. It is possible to prevent contact and generation of abnormal noise.
[0013]
With the above configuration, the cross sectional shape of the corrugation is formed into a roll
shape, and the reinforcing effect of forming the portions with different material thicknesses
suppresses the movement of the voice coil other than in the vertical direction, thereby enhancing
the center retention force. Even in the case of large amplitude, since the voice coil can be
prevented from coming into contact with the magnetic gap to generate abnormal sound, a large
amplitude amount can be obtained in a small speaker or a slim type speaker requiring a small
diameter. Thus, the voice coil can be prevented from coming into contact with the magnetic gap
to reproduce an abnormal sound while reproducing richer bass, and an effect of excellent in
quality and reliability can be achieved.
[0014]
The top view of the speaker damper of the present invention The sectional view of the speaker
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damper of the present invention The sectional view of the speaker damper of the present
invention The sectional view of the speaker damper of the present invention Cross section of the
conventional speaker damper
[0015]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0016]
First Embodiment Hereinafter, the present invention will be described using a first embodiment.
[0017]
FIG. 1 is a plan view of the speaker damper according to the present invention, and FIGS. 2, 3 and
4 are cross-sectional views of the speaker damper according to the present invention. It is.
[0018]
Here, the speaker damper 7 is connected to the corrugation 7a whose cross-sectional shape is a
roll type, the bonding portion 7b on the inner periphery thereof for coupling with the voice coil
of the speaker, and the speaker frame on the outer periphery of the corrugation 7a And a flat
portion 7c, which is an adhesive portion for the purpose.
[0019]
And the part 7d from which material thickness differs is formed in the corrugation 7a, and it is
comprised.
[0020]
With this configuration, the reinforcement effect of forming the portions 7d having different
material thicknesses, that is, by forming the thick portions, the movement of the voice coil other
than in the vertical direction is suppressed and the center retention strength is enhanced. Even in
the case of large amplitude, the voice coil can be prevented from coming into contact with the
magnetic gap to generate abnormal noise.
[0021]
The formation of the thick material portion which is the portion 7d of different material
thickness may be provided over the entire circumference or may be partially provided.
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[0022]
In the case of providing over the entire circumference, for example, as shown in FIG. 3, the
material thickness in the vicinity of the bonding portion 7b for bonding with the voice coil on the
inner periphery of the corrugation 7a is reduced and the bonding for bonding to the frame of the
outer periphery When a minute input is applied to the voice coil by thickening the vicinity of the
flat portion 7c, which is a portion, the voice coil tends to have a small amplitude due to the effect
of the thinnest portion in the vicinity of the outer periphery of the voice coil. On the other hand,
when an excessive input is applied, the supporting force is strengthened by the effect of the
thickest portion in the vicinity of the flat portion 7c which is an adhesive portion for bonding to
the frame of the outer periphery. The movement is suppressed to enhance the center retention
force, and even in the case of large amplitude, it is possible to prevent the voice coil from
contacting the magnetic gap and generating an abnormal sound.
[0023]
On the other hand, in the case of partial provision, if the number is at least three at equal
intervals as a minimum, at least movement of the voice coil other than in the vertical direction is
suppressed and center retention is strengthened. It is possible to reduce the occurrence of
abnormal noise in contact with the magnetic gap.
[0024]
Furthermore, as the number of the voice coil increases, that is, by setting a large number at equal
intervals, the movement of the voice coil other than in the vertical direction is further
suppressed, and the center retention can be further strengthened.
[0025]
Furthermore, as the thickness of the material increases, the movement of the voice coil other
than in the vertical direction can be further suppressed to further enhance the center retention.
[0026]
However, if the number is too large or the material thickness is too thick, the weight will be
increased and the sound pressure level will be lowered. Therefore, the balance should be set
appropriately in accordance with the required characteristics. Is desirable.
[0027]
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In this respect, the above-mentioned contents can provide the necessary material thickness at the
necessary position for strengthening the voice coil center retention force, and optimally balance
the voice coil center retention force and the speaker sound pressure level. It can be done.
[0028]
As described above, in a small-sized speaker or a slim type speaker which needs to reduce the
short diameter size, the voice coil can be prevented from coming into contact with the magnetic
gap to generate abnormal sound while reproducing rich bass with a large amplitude amount. It is
possible to exert excellent effects of quality and reliability that can be done.
[0029]
Furthermore, as an effect of the damper having a thick material portion, there is also an effect of
suppressing unnecessary resonance of the bobbin when transmitting the vibration of the voice
coil to the diaphragm due to the magnitude of its internal loss. It is also possible to reduce gap
defects and high gap defects caused by
[0030]
Further, as shown in the cross-sectional view of the speaker damper in FIG. 4, a damper base 7 e
provided between the speaker frame and the flat panel 7 c is further formed below the flat
portion 7 c which is an adhesive portion for coupling to the speaker frame. By doing this, it is
possible to improve the assembly accuracy and the productivity at the time of coupling as
compared with the case where another component is used as the damper base and coupled to the
damper.
[0031]
Here, the damper base 7e may be formed simultaneously with the damper 7.
[0032]
Productivity can be improved by simultaneously forming the damper 7 and the damper base 7e.
[0033]
As a material of the damper 7, it is necessary to fulfill the function as a damper, so a flexible
elastic material is required, but as a material of the damper base 7e, for preventing the damper 7
from contacting the frame Any material such as a resin material or a metal material may be used
because it only needs to fulfill the function of increasing the size.
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[0034]
Moreover, as a method of forming simultaneously, it is possible to select from existing methods
such as insert molding and outsert molding.
[0035]
And if this damper base 7e is simultaneously formed with the same material as the damper 7,
while reducing the number of parts of a damper base, the improvement of the assembly precision
at the time of coupling | bonding, and productivity can be improved.
[0036]
As a method of simultaneously forming the same material as the damper 7, a mold is prepared in
advance in a shape in which the damper 7 and the damper base 7e are coupled, and the material
is injected into the mold by injection molding. It can be realized by molding.
[0037]
With this configuration, movement of the voice coil other than in the vertical direction is
suppressed to strengthen the center retention force, and even when the amplitude is large, the
voice coil can be prevented from coming into contact with the magnetic gap to generate
abnormal noise. An excellent damper can be realized while reducing the number of parts of the
damper base, improving the assembly accuracy at the time of connection, and improving the
productivity.
[0038]
And by forming with rubber | gum as a material of the damper 7 for speakers, the motion of roll
type corrugation can be made to be smooth and, in addition, favorable linearity can be implement
| achieved by expansion | extension of damper 7 itself.
[0039]
On the other hand, when it is made of an elastomer as the material of the damper 7 for the
speaker, the movement of the roll corrugation can be smoothed as in the case of being made of
rubber, and additionally the linearity of the damper 7 is good by the elongation of the damper 7
itself. While being able to be realized, molding becomes easy and productivity improvement and
cost reduction can be achieved.
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[0040]
Furthermore, when it is made of silicon as the material of the damper 7 for the speaker, the
movement of the roll corrugation can be smoothed in the same manner as when it is made of
rubber or elastomer, and additionally the elongation of the damper 7 itself is good. Since it is
possible to realize linearity and is strong and stable with respect to temperature and humidity, it
is possible to realize improvement in quality and reliability and improvement in thermal stability
of minimum resonance frequency and sound pressure frequency characteristics. be able to.
[0041]
In particular, since the speaker damper 7 is close to the voice coil which is a heat generating
body, a great effect can be exhibited by arranging silicon having stable heat resistance and
flexibility characteristics due to temperature at a portion close to the voice coil. Can.
[0042]
In addition, by foaming the material of the above-described speaker damper 7 to form the
material, the density can be reduced while securing the material thickness of the damper 7, and it
is possible to further strengthen the center holding power, and By reducing the weight of the
above, it is possible to improve the sound pressure level and improve the transient
characteristics.
[0043]
Furthermore, by providing the damper 7 with one or more vent holes, the air inside the magnetic
gap can be released to the outside, and distortion can be reduced and transient characteristics
can be improved.
[0044]
With regard to the number of vent holes, it is desirable to provide two or more vent holes at
equal intervals, in order not to reduce the center holding power.
[0045]
Here, when the vent holes are provided on the corrugation 7 a of the damper 7, it is important to
provide the vent holes at a position that does not reduce the voice coil center holding force when
the damper 7 vibrates up and down.
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[0046]
On the other hand, when provided on the damper base 7e, there is no particular problem even if
it is provided at any position since the influence on the voice coil center holding force at the time
of vertical vibration of the damper 7 is small.
[0047]
Second Embodiment Hereinafter, the present invention will be described using a second
embodiment.
[0048]
FIG. 5 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
[0049]
As shown in FIG. 5, the magnetized magnet 1 is sandwiched between the upper plate 2 and the
yoke 3 to form an internal magnetic circuit 4.
[0050]
The frame 6 is coupled to the yoke 3 of the magnetic circuit 4.
[0051]
The outer periphery of the diaphragm 8 is bonded to the peripheral portion of the frame 6.
[0052]
Then, one end of the voice coil 9 is coupled to the central portion of the diaphragm 8, and the
other end is coupled to be fitted into the magnetic gap 5 of the magnetic circuit 4.
[0053]
The speaker damper 7 according to any one of claims 1 to 9, further comprising an inner
periphery coupled to the voice coil 9 and an outer periphery coupled to the frame 6.
[0054]
The above has described the speaker having the internal magnet type magnetic circuit 4, but the
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present invention is not limited to this, and may be applied to a speaker having the external
magnet type magnetic circuit.
[0055]
With this configuration, as described in the first embodiment, the reinforcement effect in which
the portions 7d having different material thicknesses are formed in the corrugation 7a of the
speaker damper 7 suppresses movement of the voice coil other than in the vertical direction,
thereby maintaining central retention force. Thus, the voice coil can be prevented from coming
into contact with the magnetic gap to generate an abnormal sound even at high amplitude.
[0056]
Therefore, in a small speaker or a slim type speaker which needs to reduce the short diameter
size, it is possible to prevent the voice coil from contacting the magnetic gap and generating an
abnormal sound while reproducing rich bass by a large amplitude amount. It is possible to
achieve high quality, high reliability, good characteristics and sound quality, high humidity
resistance and high heat resistance, and high productivity of the speaker.
[0057]
The present invention can be applied to a speaker that requires measures against abnormal
sound generated when a voice coil contacts a magnetic gap.
[0058]
DESCRIPTION OF SYMBOLS 1 magnet 2 plate 3 yoke 4 magnetic circuit 5 magnetic gap 6 frame
7 damper 7 a corrugation 7 b bonding portion 7 c flat portion 7 d different thickness of material
7 e damper base 8 diaphragm 9 voice coil 17 damper 17 a corrugation 17 b bonding portion 17
c flat portion
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