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DESCRIPTION JP2011019147

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DESCRIPTION JP2011019147
An object of the present invention is to provide a corrugation damper that improves the sound
quality of a speaker. SOLUTION: For each annular peak portion 5 constituting a corrugation 4, a
circumferentially varying undulation is provided, which starts from a predetermined intermediate
height and gradually changes the height while the highest is achieved. Change in height of unit
cycle to return to middle height by going through height, middle height and lowest height in this
order, and repeating for a predetermined number of cycles while going around the annular ridge
portion The predetermined cycle number is the same in each annular peak, and the start point of
the unit cycle in each annular peak is centered on the damper center from the annular peak on
the inner circumferential side to the annular peak on the outer circumferential side It shall be
sequentially shifted by a predetermined angle. [Selected figure] Figure 1
Corrugation damper and speaker
[0001]
The present invention relates to a corrugation damper and a speaker having the same.
[0002]
FIG. 11 is a diagram of a display screen showing a state in which a half of a conventional
corrugation damper used for a speaker is viewed obliquely from above.
FIG. 12 shows a cross-sectional view of a conventional corrugation damper. As shown in these
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figures, the corrugation (corrugated portion) has an undulating surface wave-like waveform that
extends from the center of the corrugation damper. That is, as shown in FIG. 12, the height
(amplitude) h of each mountain 81 of the waveform is always constant without changing in the
circumferential direction of the corrugation.
[0003]
FIG. 13 is a diagram of a display screen that displays the result of structural analysis on the
assumption that a force applied in an actual operation state is used in the speaker as compared
with the conventional corrugation damper as shown in FIG. The darker portions that appear
closer to the center of the corrugation damper are high stress portions. It can be seen that the
stress of a predetermined value or more is distributed concentrically on the inner peripheral side
of the corrugation damper.
[0004]
A corrugation damper is known in which the width, height, shape, etc., of the corrugation peaks
are changed in the radial direction. For example, the height of the peaks of the corrugation is
sequentially decreased from the inner periphery to the outer periphery, or the width of the peaks
is sequentially reduced from the inner periphery to the outer periphery so that the stiffness of
the corrugation damper decreases from the inner periphery to the outer periphery. One which is
made to be large is known (see, for example, Patent Document 1). There is also known one in
which the width of the corrugation is changed in order to make the flexibility per unit length in
the radial direction substantially equal in the corrugation damper (see, for example, Patent
Document 2).
[0005]
Patent Document 1: Japanese Patent Application Publication No. 2001-326993 Patent Document
2: Japanese Patent Application Publication No. 11-127497
[0006]
However, as a problem of general corrugation dampers, the sound quality of the speaker is
degraded due to low linearity when changing from small amplitude to large amplitude,
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generation of distortion due to amplitude asymmetry, and generation of distortion due to
resonance. The problem of causing
In terms of amplitude linearity, it is generally known that butterfly dampers are better than
corrugation dampers. However, butterfly dampers have the disadvantage that they have a high
risk of breakage if they are vibrated at extremely large amplitudes.
[0007]
An object of the present invention is to provide a corrugation damper which further improves the
sound quality of a speaker in view of the problems of the prior art.
[0008]
In order to achieve this object, the corrugation damper according to the first aspect of the
invention is characterized in that each annular peak forming the corrugation has an undulation in
the circumferential direction.
[0009]
A corrugation damper according to a second aspect of the present invention is characterized in
that in the first aspect, the undulations of the respective annular ridges regularly repeat high and
low levels several times during one round.
[0010]
In a corrugation damper according to a third aspect of the present invention, in the second
aspect, the undulations of the respective annular ridges start from a predetermined intermediate
height, and gradually change the height to reach the maximum height, the intermediate height,
And, it is characterized in that the change of the height of the unit cycle to return to the middle
height is repeated by a predetermined number of cycles while going around the annular crest,
passing through the lowest height in this order and returning to the middle height.
[0011]
In a corrugation damper according to a fourth aspect of the present invention, in the third aspect,
the predetermined number of cycles is the same in each annular peak, and the start point of the
unit cycle in each annular peak is the annular peak on the inner circumferential side From the
center to the annular ridge portion on the outer peripheral side, and are sequentially shifted by a
predetermined angle centered on the center of the damper.
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[0012]
A corrugation damper according to a fifth aspect of the invention is the corrugation damper
according to any one of the first to fourth aspects, wherein each annular peak portion has a
curved portion having a constant radius of curvature including the top, and both sides of the
curved portion. And a linear foot portion adjacent to each other, and an arrangement distance
between the annular ridges is constant, and a radius of curvature of a curved portion of each
annular ridge is the same.
[0013]
A speaker according to a sixth aspect of the invention is characterized by including a plurality of
the corrugation damper according to any of the first through fifth aspects of the invention.
[0014]
In the loudspeaker according to the seventh invention, in the sixth invention, the plurality of
corrugation dampers have the same direction of the undulations in mutually adjacent corrugation
dampers, or the direction of the undulations is reversed. It features.
[0015]
A loudspeaker according to an eighth invention is the corrugation damper according to the
fourth invention, characterized in that it has a plurality of loudspeakers in which the angular
directions of the successive deviations are the same or are mutually opposite. .
[0016]
According to the present invention, the sound quality of the speaker can be further improved.
[0017]
It is the top view of the corrugation damper which concerns on one Embodiment of this
invention, and the AA line cross-section side view.
It is sectional drawing to which the right half of FIG.1 (b) was expanded.
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It is sectional drawing to which a part of FIG. 2 was expanded.
It is a figure which shows a mode that each mountain height in the corrugation damper of FIG. 1
changes in the circumferential direction.
FIG. 2 is a diagram showing the starting point of 10 round trip changes for each mountain in the
corrugation damper of FIG. 1;
It is a figure of the display screen which shows the mode of a change of the height of each
mountain in the corrugation damper of FIG.
It is the figure which represented FIG. 6 by the ridgeline of R edge.
It is a figure of the display screen which displays the structural analysis result about the
corrugation damper of FIG.
It is a figure which shows the result of having driven the speaker using the corrugation damper
of FIG. 1, and having measured the admittance.
It is a figure which shows the result of having driven the speaker using the conventional
corrugation damper, and measuring admittance.
It is a figure of the display screen which shows a mode that the conventional corrugation damper
was seen from diagonally upward. It is a figure which shows the appearance of the cross section
of the conventional corrugation damper. It is a figure of the display screen which displays the
structural analysis result about the conventional corrugation damper.
[0018]
Fig.1 (a) is a top view of the corrugation damper which concerns on one Embodiment of this
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invention, and the figure (b) is the sectional view on the AA line. In the figure, 1 is a corrugation
damper, 2 is an inner periphery supporting the diaphragm of the speaker and the voice coil
bobbin, 3 is an outer periphery fixed to the speaker frame, and 4 is interposed between the inner
periphery 2 and the outer periphery 3 Corrugation (corrugated portion), 5 is an annular
mountain that constitutes the corrugation 4 (here, “valley” is also considered to be a reverse
mountain, and is referred to as “mountain”), 6 is R in each mountain 5 described later It is a
ridgeline of the buttocks. The corrugation damper 1 can be manufactured by thermoforming
using a cotton cloth, nylon fiber, etc. as a base material. It can also be manufactured by
thermoforming using a polymer film such as a polyimide resin as a base material, or by injection
molding using a so-called engineering plastic such as an ABS resin as a material.
[0019]
FIG. 2 is an enlarged sectional view of the right half of FIG. 1 (b). As shown in the figure, the
corrugation damper 1 is provided with mountains 5 a to 5 i as the mountain 5. The spacing S
between the mountains 5a to 5i is equal. As a value of the space S, for example, 2.3 [mm]
corresponds. Each mountain 5a to 5i exhibits the same regular undulation along the
circumferential direction of its annular shape, and in the position of the cross section in FIG. 2,
the phases of the undulations do not match except for mountain 5a and 5i. Therefore, the height
h of each mountain 5a to 5i is different in the cross section of FIG. 2 except in the case of the
mountains 5a and 5i.
[0020]
FIG. 3 is an enlarged sectional view of a part of FIG. As shown in the figure, the corrugation 4 is
constituted by curved portions C of radius R and straight portions L between the respective
curved portions C. That is, the vicinity of the top of each mountain 5 is constituted by the curved
portion C, and the skirt portion is constituted by the linear portion L. The R-edge ridge line 6
described above is a boundary between the curved portion C and the straight portion L. The
radius R of the curved portion C is equal in the circumferential direction and also in each
mountain 5. However, since the relief is provided in the circumferential direction, the height of
each mountain 5 changes in the circumferential direction. Further, as shown in FIG. 2, the
spacing S between the mountains 5 is equal. Therefore, as shown in FIG. 1A, when viewed from
above, the width of the curved portion C of each mountain 5 represented as the width between
the ridges 6 of the R edge also changes the height of each mountain 5. Change accordingly.
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[0021]
FIG. 4 shows how the height of each mountain 5 changes in the circumferential direction. The
reference numerals 41 to 43 in the figure are imaginary lines representing the cross section of
the mountain 5 in the middle height, the highest height, and the lowest height, respectively. Each
mountain 5 exhibits unevenness in the circumferential direction, and the height h of each
mountain 5 changes in the vertical direction indicated by the arrow 44 as shown by imaginary
lines 41 to 43. That is, the height h of each mountain 5 gradually increases starting from the
middle height h1 to reach the maximum height h2 and gradually decreases from there to return
to the middle height h1 and further lowers Change to a minimum height h3 and gradually rising
from there to return to the intermediate height h1 is repeated 10 times while making a round
along the circumferential direction. That is, one round trip corresponds to 36 °. As values of the
heights h1, h2 and h3, for example, h1 = 0.8 [mm], h2 = 1.1 [mm] and h3 = 0.5 [mm] correspond.
However, the starting point of this 10 round trip change is different in each mountain 5.
[0022]
FIG. 5 is a diagram showing the start point of 10 round trip changes for each mountain 5. In the
same figure, each starting point is shown about the case where the corrugation damper 1 is seen
from the top. In the figure, a to i are ridge lines of mountains 5a to 5i (a series of highest
portions), Pa to Pi are start points at which each of the mountains 5a to 5i starts to change 10
round trips, and 51 are ridge lines a to The dashed line passing through the point having the
highest height h2 of i, 52 is the dotted line passing through the point where the height of each
ridgeline a to i is the lowest height h3, 53 is the center C of the corrugation damper 1 It is a line
which shows the circumferential direction position (angular position) for every 9 degrees made
into the center.
[0023]
As shown in the figure, the start points Pa to Pi are arranged at intervals of 45 ° sequentially
around the center C. Therefore, the start points Pa and Pi are located at the same angular
position around the center C. In addition, since one reciprocation corresponds to 36 ° (= 360 °
× 10 reciprocations), as shown by lines 51 and 52, portions of the same height in each
mountain 5a to 5i extend from mountain 5a to mountain 5i. It arrange | positions spirally,
shifting | deviating by 9 degree (= 45 degrees-36 degrees) one by one.
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[0024]
FIG. 6 is a view of a display screen showing how the height of each mountain 5 changes. FIG. 7 is
a view representing FIG. 6 by a ridge line 6 at the R end. In these figures, it is shown that
approximately half of the corrugation damper 1 is viewed obliquely from above. As described
above, by changing the heights of the respective peaks 5 in the circumferential direction while
sequentially shifting the phase between the respective peaks 5 by 9 °, in the corrugation 4, hard
portions and soft portions are provided in a spiral shape. There is.
[0025]
When driving the speaker using the corrugation damper 1, the inner circumferential portion 2
also vibrates with the vibration of the voice coil bobbin of the speaker. Since the outer peripheral
portion 3 is fixed to the speaker frame, it does not vibrate. Therefore, the vibration of the inner
circumferential portion 2 is attenuated through the corrugation 4 between the inner
circumferential portion 2 and the outer circumferential portion 3 and is supported by the outer
circumferential portion 3. At that time, in order to improve the performance of the speaker, the
corrugation damper 1 needs to hold the vibration transmitted from the voice coil to the
diaphragm as accurately as possible without deteriorating the linearity with respect to the drive
signal.
[0026]
FIG. 8 is a diagram of a display screen displaying a result of structural analysis performed by
adding a force assumed when the speaker using the corrugation damper 1 is actually driven to
the analysis model of the corrugation damper 1. It can be seen that the stress in the corrugation
4 is dispersed in accordance with the height change of 10 cycles in each of the mountains 5
described above, and is dispersed in a spiral form of 10 branches. That is, it can be seen that the
stress is dispersed in the vicinity of the portion where the height h of the mountain indicated by
the line 52 (FIG. 5) is low h3. That is, it can be understood that the vibration of the diaphragm
can be supported by the action close to that of the butterfly damper.
[0027]
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FIG. 9 shows a result of driving a speaker using the corrugation damper 1 and measuring
admittance with respect to a driving current. FIG. 10 shows the results of measuring the
admittance for the drive current under the same conditions, using the conventional corrugation
damper prepared in the same manner as in the case of the corrugation damper 1 except that the
heights of the corrugation peaks are made constant in the circumferential direction. Indicates As
shown in FIG. 10, according to the conventional corrugation damper, a large secondary
resonance peak appears at 761 [Hz], while according to the corrugation damper 1 of the present
embodiment, it is shown in FIG. As can be seen, secondary resonance peaks are dispersed at 640
[Hz], 649 [Hz] and 693 [Hz], and it is understood that they are expressed small. Therefore,
according to the corrugation damper 1 of this embodiment, compared with the conventional
corrugation damper, it turns out that distortion can be suppressed and it can contribute to the
improvement of sound quality.
[0028]
As described above, according to the present embodiment, since the unevenness is provided in
the circumferential direction of the corrugation, a large stress is conventionally distributed on the
inner peripheral side, but a portion to which a large stress is applied is dispersed. Distribution to
the outer peripheral portion. Therefore, the resonance peak can be separated and made smaller
than in the prior art. Therefore, distortion can be suppressed. In addition, resistance to bending
fatigue can be improved.
[0029]
In addition, since the angular period of the unevenness is made constant at each mountain and
the start point of the unevenness at each mountain is sequentially shifted by a predetermined
angular position from the inner circumferential mountain to the outer circumferential mountain,
high stress is applied. This makes it possible for the diaphragm to vibrate more smoothly due to
its behavior like a butterfly damper. That is, since it has the property of a butterfly damper, it is
possible to improve the linearity of amplitude as compared with the conventional corrugation
damper. Further, even in the case of vibration with a large amplitude, there is no fear of breakage
as in the case of a normal corrugation damper.
[0030]
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The present invention is not limited to the above embodiment, and can be appropriately modified
and implemented. For example, although not mentioned above, in the case of using the
corrugation damper according to the present invention in a speaker having a large aperture and
high input resistance, a plurality of corrugation dampers may be used. . In this case, the angular
position between the corrugation dampers may be adjusted so that the direction of the
undulations in the corrugation dampers becomes the same or reverse. Further, as each of the
corrugation dampers, a plurality of corrugations may be used in which the arrangement of the
start points of the relief is in the same direction or in the opposite direction to each other as
described above.
[0031]
1: Corrugation damper, 2: Inner circumferential portion, 3: Outer circumferential portion, 4:
Corrugation, 5, 5a to 5i: mountain, 6: R ridge of ridge, 41 to 43: imaginary line representing
cross section of mountain, C: R Part, L: straight part, a to i: ridge line, Pa to Pi: starting point, 51:
dashed line, 52: dotted line, 53: line indicating circumferential position.
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