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JP2009055492

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DESCRIPTION JP2009055492
PROBLEM TO BE SOLVED: To make stable operation as a speaker possible because the overall
height dimension of the speaker diaphragm is small and the rigidity of the dome portion is
sufficiently high, the sound pressure frequency characteristic is wide and flat, and defects such as
noise occur Provided is a speaker diaphragm which is less likely to be generated and capable of
preferable sound reproduction. SOLUTION: In the speaker diaphragm of the present invention, a
dome portion is a concave dome portion formed in the center, a convex dome portion formed
around the outer periphery of the concave dome portion, a concave dome portion and a convex
dome portion Are formed straddling in the radial direction a plurality of radially concave ribs
formed straddling the radial direction, a voice coil mounting portion formed on the outer
periphery of the convex dome portion, and a convex dome portion and a voice coil mounting
portion And a plurality of radially convex ribs, wherein one radially convex rib is spaced apart
and disposed between two adjacent radially concave ribs disposed in the circumferential
direction. [Selected figure] Figure 1
Speaker diaphragm and speaker using the same
[0001]
The present invention relates to a speaker diaphragm used as a speaker for reproducing sound in
a portable electronic device such as a portable telephone or a portable game machine, and a
speaker using the same.
[0002]
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1
In a small speaker, for example, a film-like member made of resin such as PEI (polyether imide) is
molded to integrally form a dome portion and an edge portion extended around the periphery of
the dome portion. The configured speaker diaphragm may be used.
When this speaker is an electrodynamic speaker, a voice coil to which an audio signal current is
supplied from the back side may be attached to the joint portion between the dome portion and
the edge portion of the speaker diaphragm. The outer peripheral end side of the edge portion of
the speaker diaphragm is fixed to a frame connected to a small lightweight magnetic circuit, and
the voice coil is disposed in the magnetic gap of the magnetic circuit. The shape of the
loudspeaker diaphragm affects the quality and characteristics of the sound reproduced by the
small speaker and the overall geometry of the small speaker.
[0003]
In addition, conventionally, among small-sized speakers used in portable game machines and the
like, there have been attempts to reduce the overall height of not only the magnetic circuit but
also the speaker diaphragm to further reduce the size, thickness and weight. For example, the
cross-sectional shape of the voice coil on the inner peripheral side has a substantially dome
shape, and a recess is formed in part of the substantially dome shape to reduce unnecessary
resonance and reduce the height of the speaker diaphragm. There is one that realizes (Patent
Document 1). Also, in the diaphragm in which the sub dome portion is continuously provided
around the main dome portion, the sub dome portion has a large number of radial narrow
grooves in order to flatten the relative sensitivity at 4 to 8 kHz. There is one in which the inner
end reaches the boundary between the main dome portion and the sub dome portion (Patent
Document 2).
[0004]
Also, conventionally, in order to suppress the abnormal vibration of the diaphragm due to the
natural resonance of the voice coil joined and suspended at the boundary position between the
dome portion and the edge portion of the diaphragm to improve the acoustic frequency
characteristics, A flat portion is provided at the boundary position with the edge portion,
reinforcing ribs are formed at the rising portions of the dome portion and the edge portion at the
boundary position, and radial rigidity is enhanced at the joining position where the voice coil is
joined. There is what you are doing (patent document 3). In addition, the disturbance of the high
frequency characteristic due to the harmonic distortion can be reduced, and the degree of
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2
freedom in adjusting the compliance in the edge damper can be increased, and the desired
compliance without variation over the entire area around the diaphragm can be ensured.
Therefore, by forming reinforcement for the uneven structure on the outer peripheral part of the
edge damper main body integrated with the outer periphery of the dome-shaped diaphragm,
uniformization of compliance around the diaphragm and improvement of the adjustment
freedom are achieved. Some of the diaphragms of the mold are designed to improve rigidity by
radially forming reinforcing ribs by grooves or ridges extending from near the center of the
dome to the outer periphery of the dome (see Patent Literature 4).
[0005]
JP-A 2005-184588 (FIG. 1) JP-A 8-140183 (FIGS. 1 to 3) JP-A 9-135491 (FIGS. 1 to 3) JP-A
2006-287418 Publication (Figs. 1 to 6)
[0006]
However, in the speaker diaphragm of the prior art and the speaker using the same, it is
compatible with the response to the further thinning required for the speaker suitable for the
portable electronic device and the response to the peak dip on the frequency characteristic in the
high frequency range. It may not be enough to
That is, even if the concave dome shape is formed in a part of the substantially dome shape in
order to reduce the overall height of the speaker diaphragm, the boundary between the concave
dome shape and the convex dome shape is in the vibration mode. In this case, there is a problem
that stable movement can not be achieved, and dips occur in the high frequency range of the
sound pressure frequency characteristics, so that good sound reproduction can not be
performed.
[0007]
The present invention has been made to solve the problems of the prior art described above, and
its object is to form a film-like member made of a resin, and to form a dome portion and the
outer periphery of the dome portion. With regard to a speaker diaphragm integrally configured
with an extended edge portion and a speaker using the same, the overall height dimension of the
speaker diaphragm is small, and the rigidity of the dome portion is sufficiently high, which is
stable as a speaker An object of the present invention is to provide a speaker diaphragm which is
operable, has a wide sound pressure frequency characteristic, is flat and hardly causes defects
such as generation of abnormal noise, and is capable of preferable sound reproduction.
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[0008]
The speaker diaphragm according to the present invention is a speaker diaphragm in which a
dome-shaped portion and an edge portion extended around the periphery of the dome portion
are integrally formed by forming a film-like member, and the dome portion is A concave dome
portion formed in the center, a convex dome portion formed on the outer periphery of the
concave dome portion, and a plurality of radial concave ribs formed radially across the concave
dome portion and the convex dome portion A voice coil attachment portion formed on the outer
periphery of the convex dome portion; and a plurality of radially convex ribs formed across the
convex dome portion and the voice coil attachment portion in the radial direction; Radially
convex ribs are spaced apart between two adjacent radially concave ribs arranged
circumferentially.
[0009]
Preferably, in the convex dome portion of the dome portion, the speaker diaphragm of the
present invention is arranged such that the radial concave rib and the radial convex rib appear
alternately in the circumferential direction.
[0010]
More preferably, in the loudspeaker diaphragm according to the present invention, in the convex
dome portion of the dome portion, the first radius value defining the radially outer end of the
radial concave rib is the radial direction of the radial convex rib It is larger than the second
radius value that defines the inner circumferential end.
[0011]
The speaker diaphragm of the present invention further includes a voice coil attached to the
voice coil attachment.
[0012]
Furthermore, the speaker of the present invention comprises the speaker diaphragm of the
present invention.
[0013]
Hereinafter, the operation of the present invention will be described.
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[0014]
The speaker diaphragm of the present invention is formed by molding a film-like member made
of resin such as PEI (polyetherimide) to be suitable for a small-sized and thin-sized speaker used
for a portable telephone, a portable game machine, etc. The speaker diaphragm is integrally
formed with the dome portion at the central portion and the edge portion extended around the
outer periphery of the dome portion.
The dome portion is generally convex toward the front side, and when viewed from a voice coil
mounted from the back side, the dome portion forms a radially inner side.
The dome portion is a portion of the surface area of the speaker diaphragm to which the driving
force from the voice coil is well transmitted, and thus plays a main role as a diaphragm that emits
sound waves.
On the other hand, the edge portion constitutes the outer side in the radial direction than the
voice coil, and forms a corrugated having asperities, and the outer peripheral end thereof is fixed
to the frame.
The edge portion vibratably supports the dome portion and also functions as a diaphragm that
emits a sound wave.
[0015]
The dome portion has a concave dome portion formed in the center, a convex dome portion
formed on the outer periphery of the concave dome portion, and a voice coil attachment portion
formed on the outer periphery of the convex dome portion. ing.
That is, the dome portion has a convex dome portion which is shaped to have rigidity as a
speaker diaphragm, and a voice coil attachment portion as a flat portion to which a voice coil is
attached on the outer peripheral end side of the convex dome portion. The vicinity of the vertex,
which is the center in the radial direction of the convex dome portion which is the highest as the
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full height of the speaker diaphragm, has a shape in which it is recessed as a concave dome
portion.
Therefore, the overall height of the speaker diaphragm can be reduced while increasing the
rigidity of the dome portion.
[0016]
The dome portion of the speaker diaphragm according to the present invention straddles the
plurality of radial concave ribs formed in the radial direction in the concave dome portion and
the convex dome portion, and the convex dome portion and the voice coil attachment portion in
the radial direction. And a plurality of radially convex ribs formed.
Here, when the speaker diaphragm is viewed from the front side, the radially concave rib is a
radially extending groove-like structure formed to be recessed on the back side. On the other
hand, a radially convex rib is a radially extending beam-like structure formed so as to project to
the surface side opposite to the radially concave rib, and viewed from the back side, the radial
direction Similar to the concave rib, it is a radially extending groove-like structure formed
concave on the surface side. The radially concave rib and the radially convex rib are both radially
formed radially from the center of the speaker diaphragm, and the portion where the rib is
formed functions to enhance the rigidity of the dome portion.
[0017]
That is, since the plurality of radially concave ribs are formed across the concave dome portion
and the convex dome portion in the radial direction, the boundary portion between the concave
dome portion and the convex dome portion is strengthened. On the other hand, since the
plurality of radial direction convex ribs are formed across the convex dome portion and the voice
coil attachment portion in the radial direction, the boundary portion between the convex dome
portion and the voice coil attachment portion is strengthened. Here, one radially convex rib is
spaced apart between two adjacent radially concave ribs arranged in the circumferential
direction. Preferably, in the convex dome portion of the dome portion, the radial concave rib and
the radial convex rib are arranged so as to alternately appear in the circumferential direction.
Therefore, not only the rigidity of the convex dome portion is generally strengthened, but also
the boundary portion with the concave dome portion which is the inner side of the convex dome
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portion and the voice coil attachment portion which is the outer side of the convex dome portion.
Even if the boundary portion is reinforced and has a concave dome portion that reduces the
overall height dimension of the speaker diaphragm, the divided vibration of the dome portion of
the speaker diaphragm can be suppressed, and the sound pressure frequency characteristic is
high. There is no dip in the pitch range.
[0018]
In the speaker diaphragm of the present invention, the first radius value defining the radially
outer peripheral end of the radially concave rib is greater than the second radius value defining
the radially inner peripheral end of the radially convex rib When designed to be large, radially
convex ribs and radially concave ribs appear alternately in the circumferential direction at a
predetermined radius from the center in the convex dome portion. That is, since it is possible to
provide a reinforcing structure in which the radial convex rib and the radial concave rib are
wrapped around the radial middle of the main convex dome portion as the speaker diaphragm, it
is possible to use the loudspeaker diaphragm as a dome. The rigidity of the part can be enhanced
in a well-balanced manner. As a result, it is possible to realize a speaker diaphragm capable of
performing stable and good audio reproduction and a speaker using the same.
[0019]
The shape of the corrugation forming the edge portion may be any shape that allows the speaker
diaphragm and the voice coil to vibrate properly, and it may be a corrugation shape, a roll shape,
or a cone shape. Good. In the speaker using the speaker diaphragm of the present invention,
since the rigidity of the dome portion is enhanced by the plurality of ribs provided at the
boundary portion, an input signal having a wide reproduction frequency range and a large
amplitude is applied to the voice coil. Even in this case, defects such as generation of abnormal
noise hardly occur, and preferable sound reproduction can be performed.
[0020]
The speaker using the speaker diaphragm of the present invention has a small overall height
dimension of the speaker diaphragm, and the rigidity of the dome portion and the edge portion is
sufficiently high to enable stable operation as a speaker, and the sound pressure frequency
characteristic is It is possible to realize a speaker that is wide and flat, is less likely to cause
defects such as abnormal noise, and can perform preferable sound reproduction.
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[0021]
The speaker diaphragm according to the present invention has a small overall height of the
speaker diaphragm and a sufficiently high rigidity of the dome portion and the edge portion to
enable stable operation as a speaker, and a wide flat sound pressure frequency characteristic.
The object of the present invention is to provide a speaker capable of preferable sound
reproduction, in which defects such as abnormal noise do not easily occur, and a film-like
member is formed, and a dome portion and an edge portion extended around the outer periphery
of the dome portion , And the dome portion is a concave dome portion formed in the center, a
convex dome portion formed on the outer periphery of the concave dome portion, a concave
dome portion and a convex dome And a voice coil mounting portion formed around the outer
periphery of the convex dome portion, and a convex dome portion and a voice coil mounting
portion in the radial direction. And a plurality of radially convex ribs formed such that one
radially convex rib is spaced apart between two adjacent radially concave ribs circumferentially
arranged. It was realized by
[0022]
Hereinafter, although the speaker diaphragm by the preferable embodiment of this invention and
the speaker using the same are demonstrated, this invention is not limited to these embodiments.
[0023]
FIG. 1 is a view for explaining a speaker 1 using a speaker diaphragm 10 according to a
preferred embodiment of the present invention.
Fig.1 (a) is a front view of the speaker 1, FIG.1 (b) is a side sectional view by an A-A 'cross
section.
The speaker 1 according to the present embodiment is a small-sized and thin electrodynamic
speaker with a diameter of 20 mm, and includes a lightweight internal-magnet-type magnetic
circuit 2 and a speaker diaphragm 10.
The speaker diaphragm 10 is obtained by molding a film-like member made of PEI (polyether
imide) resin, and as described later, the dome portion 11 and the edge portion 12 are integrally
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configured.
[0024]
The speaker 1 has a frame 4 attached to the magnetic circuit 2 and vibratably supporting the
speaker diaphragm 10, in addition to the magnetic circuit 2 which is composed of a pole, a
magnet and a yoke and has a magnetic gap 3; And a voice coil 5 attached to the back side of the
magnetic head and disposed in the magnetic air gap 3. The frame 4 is provided with a terminal 6
for supplying an audio signal current to the voice coil 5, and a tinsel wire connecting the voice
coil 5 and the terminal 6 is omitted in FIG.
[0025]
In the speaker 1, the side on which the speaker diaphragm 10 is exposed is the front, and the
side on which the magnetic circuit is exposed is the rear. The overall height of the speaker 1 is
influenced by the height of the magnetic circuit 2 and the height of the speaker diaphragm 10.
The frame 4 has an edge at the outer peripheral end most projecting to the front side to protect
the speaker diaphragm 10, and the edge of the frame 4 and the most projecting portion to the
back side of the magnetic circuit 2 are speakers Define the total height dimension H of 1.
However, in the case of this embodiment, thinning is achieved by reducing the total height h
(about 0.65 mm) of the speaker diaphragm 10, and the total height H of the speaker 1 is only 2.8
mm. is there. Further, the voice coil 5 is adhesively fixed on the back side of the speaker
diaphragm 10 by an adhesive.
[0026]
In the speaker 1, the voice coil 5 is disposed in the magnetic gap 2 in which a strong DC
magnetic field is generated, and when an audio signal current is supplied to the voice coil 5,
driving force is generated in the front-rear direction of the speaker diaphragm 10, A speaker
vibration system configured of the voice coil 5 and the speaker diaphragm 10 vibrates in the
front-rear direction. That is, the speaker vibration system is vibratably supported only by the
edge 12 of the speaker diaphragm 10. As a result, pressure change occurs in the air present
before and behind the speaker diaphragm 10, and the sound signal current is Convert to).
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[0027]
FIG. 2 is a view for explaining the speaker diaphragm 10, and FIG. 2 (a) is a front view, and FIG. 2
(b) is a side sectional view taken along the line O-A. The speaker diaphragm 10 is a dome / edge
integrated diaphragm formed through a process of press-molding a film-like member having a
thickness of 30 μm and made of PEI (polyetherimide) resin. That is, the speaker diaphragm 10 is
a speaker diaphragm in which the low dome shape 11 having a substantially dome shape and the
edge portion 12 extended around the outer periphery of the dome portion 11 are integrally
formed. The diameter is about 22 mm.
[0028]
The dome portion 11 constitutes the inside in the radial direction of the circular area defined by
the voice coil 5 attached from the back side in the speaker diaphragm 10, and its general shape
is a convex portion on the front side. The dome portion 11 includes a concave dome portion 13
formed in the center, a convex dome portion 14 formed on the outer periphery of the concave
dome portion, and a voice coil attachment portion 15 formed on the outer periphery of the
convex dome portion 14. And. The concave dome portion 13 is concave so as to have sufficient
rigidity as a speaker diaphragm in the vicinity of the vertex which is the center in the radial
direction of the convex dome portion 14 formed in a convex shape on the front side from the
voice coil attachment portion 15 It is a part to reinforce by denting. Therefore, the foremost
portion of the speaker diaphragm 10 that defines the total height h is the boundary between the
concave dome portion 13 and the convex dome portion 14. That is, the boundary portion
between the concave dome portion 13 and the convex dome portion 14 is a front convex portion
as a whole, and includes a ridge line 16 representing the boundary. The outer diameter diameter
of the concave dome portion 13 is φ5.0, and the outer diameter diameter of the convex dome
portion 14 is φ11.6.
[0029]
Further, the voice coil attachment portion 15 is a narrow flat portion to which the voice coil 5 is
attached on the outer peripheral end side of the convex dome portion 14, and the width in the
radial direction is about 0.4 mm. The boundary between the convex dome portion 14 and the
voice coil attachment portion 15 is a portion where the convex dome portion 14 rises from the
flat voice coil attachment portion 15, and includes a valley line 17 representing the boundary.
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[0030]
The edge portion 12 constitutes the outer side in the radial direction of the circular region
defined by the voice coil 5 and functions as a diaphragm that radiates a sound wave by forming a
corrugation 18 having asperities, while the dome portion 11 can be vibrated. To support. The
corrugation 18 comprises a convex roll 18a connected to the voice coil mounting portion 15 on
the inner peripheral side, a concave roll 18b connected to the convex roll 18a, and a convex roll
18c connected to the concave roll 18b. The inner diameter is φ12.4 mm and the outer diameter
is φ21 mm. The outer peripheral end of the edge portion 12 is a flat portion 19 fixed to the
frame 4 and serves as a reference for defining the overall height h of the speaker diaphragm 10.
Therefore, the total height h of the speaker diaphragm 10 in the case of the present embodiment
is about 0.65 mm.
[0031]
Ribs 20 are formed on the dome portion 11 of the speaker diaphragm 10 so as to enhance the
rigidity of the dome portion 11. Since the dome portion 11 is formed by connecting the concave
dome portion 13, the convex dome portion 14, and the voice coil attachment portion 15 having
different surface configurations, the inflection point in the cross-sectional shape corresponds to
these boundary portions The ridge line 16 and the valley line 17 described above are formed in
plan view. When the rigidity of the boundary portion including the ridge line 16 and the valley
line 17 is insufficient, the boundary portions where the shapes of the concave dome 13, the
convex dome 14, and the voice coil attachment portion 15 change become nodes of the vibration
mode. The split vibration is remarkable, and dips may occur in the high frequency range of the
sound pressure frequency characteristic, so that the sound may not be reproduced well.
Therefore, the rib 20 is formed to enhance the rigidity of the boundary portion of the dome
portion 11. In the case of the speaker diaphragm 1 of the present embodiment, sixteen radial
concave ribs 21 are formed in the radial direction at the boundary portion including the concave
dome portion 13 of the dome portion 11 and the ridge line 16 of the convex dome portion 14. It
is formed to straddle. Further, at the boundary portion including the convex dome portion 14 of
the dome portion 11 and the valley line 17 of the voice coil attachment portion 15, sixteen radial
convex ribs 22 are formed so as to straddle in the radial direction.
[0032]
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11
The radial concave rib 21 is a groove-like structure having a width of about 0.4 mm which is
formed to be recessed on the back surface side when the speaker diaphragm 10 is viewed from
the front side. Starting from the middle portion, it is formed across the radial direction to the
middle portion of the convex dome portion 14. The radius r1 defining the radially inner end
point of the radially concave rib 21 is approximately 1.0 mm, and the first radius R1 defining the
radially outer end point is approximately 4.1 mm. The depth of the radially concave rib 21 varies
depending on the shapes of the concave dome portion 13 and the convex dome portion 14, but
the maximum depth is about 0.2 mm. The sixteen radially concave ribs 21 are radially arranged
at equal intervals with reference to the center point O. Therefore, since the radial concave rib 21
is formed so as to make a part of the ridge line 16 convex in the whole indent at a plurality of
places, the rigidity of the boundary portion between the concave dome portion 13 and the
convex dome portion 14 is enhanced. .
[0033]
In addition, the radial convex rib 22 has a radially extending width of about 0 that is formed to
project to the surface side when the speaker diaphragm 10 is viewed from the front side, in
contrast to the radial concave rib 21. It has a beam-like structure of 45 mm, and is formed
straddling the radial direction from the convex dome portion 14 to the voice coil attachment
portion 15. However, the radial convex rib 22 has a groove-like structure when the speaker
diaphragm 10 is viewed from the back surface side, like the radial concave rib 21, and the height
of the beam (the depth of the groove) The maximum depth is approximately 0.2 mm although it
changes depending on the shapes of the convex dome portion 14 and the voice coil attachment
portion 15. The second radius R2 defining the radially inner end point of the radially convex rib
22 is about 2.8 mm, and the radius r2 defining the radially outer end point is an outer portion of
the voice coil attachment portion 15 It is equal to about 5.8 mm in diameter. The sixteen radially
convex ribs 22 are also radially arranged at equal intervals with reference to the center point O.
Therefore, since the radial direction convex rib 22 is formed so that a part of the valley line 17
which is a rising portion of the convex dome portion 14 is made to project in a beam shape at a
plurality of places, the convex dome portion 14 and the voice The rigidity of the boundary
portion of the coil attachment portion 15 is enhanced.
[0034]
However, as shown in FIGS. 1 and 2, the radially concave rib 21 and the radially convex rib 22 of
the speaker diaphragm 1 are circumferentially offset from the center point O by an angle of
11.25 °. , Has a relative arrangement relationship that does not overlap. That is, in the convex
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dome portion 14 of the dome portion 11, one radial convex rib 22 is spaced apart between two
adjacent radial concave ribs 21 arranged in the circumferential direction, The direction concave
rib 21 and the radial convex rib 22 alternately appear in the circumferential direction. In the case
of this embodiment, the first radius R1 (about 4.1 mm) defining the outer peripheral end point of
the radially concave rib 21 defines the first inner peripheral end point of the radially convex rib
22 in the radial direction. This is because it is set larger than the two radius R2 (about 2.8 mm).
[0035]
Therefore, in the speaker diaphragm 10 of the present embodiment, the dome portion 11 of the
speaker diaphragm 1 can be provided with a reinforcing structure in which the radially concave
rib 21 and the radially convex rib 22 are circumferentially wrapped. Therefore, the rigidity of the
dome portion 11 can be enhanced in a well-balanced manner. Not only is the rigidity of the
convex dome portion 14 entirely strengthened, but also the boundary portion with the concave
dome portion 13 which is the inner side of the convex dome portion 14 and the voice coil
attachment portion which is the outer side of the convex dome portion 14 The boundaries with
15 are each strengthened. That is, even if the speaker diaphragm 1 has the concave dome
portion 13 which reduces the overall height dimension of the dome portion 11, the divided
vibration of the speaker diaphragm 1 can be suppressed, and the high pressure range of the
sound pressure frequency characteristic is obtained. There is no dip.
[0036]
FIG. 3 is a graph showing sound pressure frequency characteristics (converted to 1 W input / 1
m axis) of the speaker 1 including the speaker diaphragm 10 of the present embodiment. The
horizontal axis is the frequency (Hz) of the audio signal, and the vertical axis is the sound
pressure level (SPL: dB). The lowest resonance frequency f0 is about 850 Hz, and a wide
reproduction frequency range from the lowest resonance frequency f0 to about 5 kHz is secured.
In addition, since the rigidity of the dome portion 11 is enhanced in a well-balanced manner,
although there is a peak at around 4.8 kHz and a dip at around 5.2 kHz, significant dips are
reduced, and due to the divided vibration of the edge portion Relative to the peak around 6.3
kHz, relatively flat characteristics are obtained. Further, at the time of rated power input of 0.1
W, no abnormal noise and the like are generated from the speaker 1 of the present embodiment,
and good sound reproduction is possible.
[0037]
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13
FIG. 4 is a graph showing sound pressure frequency characteristics (converted to 1 W input / 1
m axis) of a speaker (not shown) of a comparative example using a conventional (not shown)
speaker diaphragm. The speaker of this comparative example is a small-sized electrodynamic
speaker provided with a speaker diaphragm having the same aperture as the speaker 1 of the
first embodiment, and the basic shapes of the dome portion and the edge portion are the
speakers of the first embodiment. It is in common with the dome portion 11 and the edge portion
12 of FIG. That is, in the speaker diaphragm of the comparative example, although the concave
dome portion formed in the center to increase the rigidity of the dome portion is provided, the
rib 20 (radial concave rib as in Example 1 to increase the rigidity of the boundary portion of the
dome portion) 21 and radial convex ribs 22) are not formed to straddle in the radial direction.
[0038]
In the case of the speaker of the comparative example, although the frequency characteristic of
the tendency similar to that of the example is observed, a remarkable peak dip appears at about
2 kHz to 5 kHz because the rigidity of the dome portion of the speaker diaphragm is insufficient.
, Frequency characteristics are disordered. That is, it has a peak near about 2.5 kHz and a dip
near 3.1 kHz, and a remarkable dip occurs between the peak around 6.3 kHz due to the divided
vibration of the edge portion. This is because the boundary portion including the ridge line
between the concave dome portion and the convex dome portion is formed even if the concave
dome portion is formed in a part of the approximately dome shape in order to reduce the overall
height dimension of the speaker diaphragm of the comparative example. Because the rigidity is
insufficient, this boundary portion becomes a node of the vibration mode, and the concave dome
portion and the convex dome portion vibrate in the relationship of the reverse phase. The same
problem occurs at the boundary between the convex dome portion and the voice coil attachment
portion including the valley line. Therefore, in the speaker diaphragm of the comparative
example, the speaker can not operate stably, and dips occur in the high frequency range of the
sound pressure frequency characteristic, so that good sound reproduction can not be performed.
At the rated input of 0.1 W input, the speaker of the comparative example is not stable in
operation and abnormal noise is likely to occur, and the speaker 1 of the previous embodiment is
more suitable for better sound reproduction.
[0039]
Further, the speaker diaphragm 1 of the present invention is not limited to the above
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14
embodiment, and is a large-sized speaker having another large aperture, and even if it is an
electrodynamic speaker having a separate damper, the speaker diaphragm 1 However, it is
applicable if it is a speaker diaphragm which shape | molded the film-form member and
integrated the dome part 11 and the edge part 12 extendedly installed by the outer periphery of
the dome part 11. If the dome portion 11 of the speaker diaphragm 1 has the concave dome
portion 13 formed in the center, the plurality of radial concave ribs 21 and the radial convex
shape for reinforcement of the boundary portion of the dome portion 11 The ribs 22 may be
arranged. One radially convex rib 22 of the plurality is spaced apart between two adjacent
radially concave ribs 21 arranged in the circumferential direction, or the radially concave rib 21
And the radially convex ribs 22 may be arranged so as to alternately appear in the
circumferential direction. The rigidity of the convex dome portion 14 of the dome portion 11 of
the speaker diaphragm 1 is enhanced to realize a speaker capable of performing good sound
reproduction with less peak dip.
[0040]
Of course, the speaker diaphragm 1 of the present invention is not limited to the above
embodiment, and ribs 20 having other arrangement shapes or other cross-sectional shapes (i.e.,
radial concave rib 21 and radial convex rib 22) It may have the Specifically, the radially concave
rib 21 and the radially convex rib 22 are not limited to the linear groove shape (or beam shape),
but may be curved so as to draw a spiral in the circumferential direction, for example. Even in
such a curved rib, it is only necessary that one radial convex rib 22 provided in the radial
direction be spaced between two adjacent radial concave ribs 22.
[0041]
As for the shape of the corrugation 18 which forms the edge portion 12, in the case of the first
embodiment, the height of the portion projecting most to the front side is lower than the entire
height of the dome portion 11, and the cross-sectional shape is bent. The waveform is not limited
to this. The corrugation 18 which forms the edge portion 12 may have a height of a portion
projecting to the front side equal to or higher than the entire height of the dome portion 11.
Other than the case of the first embodiment, a plurality of small radius rolls may have a
continuous waveform, or one large roll shape may be used. In the speaker 1 using the speaker
diaphragm 10 of the present invention, even when an input signal having a wide reproduction
frequency range and a large amplitude is applied to the voice coil 5, defects such as generation of
abnormal noise do not easily occur. Favorable sound reproduction is possible.
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[0042]
Moreover, the resin material which comprises the speaker diaphragm 10 of this invention is not
limited to the film-like member of PEI of the said Example. The material forming the speaker
diaphragm 10 is, for example, other PET (polyethylene terephthalate), PEN (polyethylene
naphthalate), PC (polycarbonate), PI (polyimide), PAR (polyarylate), PPS (polyphenylene sulfide),
etc. The light-weight resin material film or the sheet may be formed by hot pressing, or the sheet
of the elastomer may be formed by pressing.
[0043]
Further, the speaker diaphragm and the speaker of the present invention are not limited to the
above embodiments. The magnetic circuit is not limited to the internal magnet type magnetic
circuit illustrated in the description of the present embodiment, and may be an external magnet
type magnetic circuit or a repulsive magnetic circuit. Further, the speaker diaphragm is not
limited to a circular shape, and may be an elliptical or track cone-shaped diaphragm.
[0044]
The speaker diaphragm of the present invention is not limited to the speaker used for portable
electronic devices such as mobile phones and portable game devices, but is used for speakers
used for home stereo reproduction or multi-channel surround reproduction, audio equipment for
vehicles It is also possible to apply to speakers that are
[0045]
It is a figure explaining the speaker 1 using the speaker diaphragm 10 by the preferable
embodiment of this invention.
(Example 1) It is a figure explaining the speaker diaphragm 10 by the preferable embodiment of
this invention. (Example 1) It is a graph showing the sound pressure frequency characteristic of
the speaker by a preferred embodiment of the present invention. (Example 1) It is a graph
showing the sound pressure frequency characteristic of the speaker using the speaker diaphragm
of a comparative example. (Comparative example)
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Explanation of sign
[0046]
Reference Signs List 1 speaker 2 magnetic circuit 3 magnetic air gap 4 frame 5 voice coil 6
terminal 10 speaker diaphragm 11 dome portion 12 edge portion 13 concave dome portion 14
convex dome portion 15 voice coil attachment portion 16 ridge line 17 valley line 18 corrugation
19 flat portion
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17
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