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JP2007221417

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007221417
The present invention relates to a speaker diaphragm of a thin speaker used for various video
and audio equipment, and enables provision of a speaker diaphragm capable of a thin speaker
having an expanded high frequency band upper limit frequency. It is a thing. A speaker
diaphragm according to the present invention includes a substantially planar diaphragm 501, a
spiral planar voice coil 504 formed on at least one surface of the diaphragm 501, and a planar
voice coil 504. In the inner circumference, the reinforcing wiring 121 is formed apart from these,
and in addition to the voice coil 504 on the planar diaphragm 501, the reinforcing wiring 121 is
also provided, and the speaker vibration excellent in shape rigidity As a board, it can contribute
to thinning of the speaker. [Selected figure] Figure 1
Speaker diaphragm
[0001]
TECHNICAL FIELD The present invention relates to a speaker diaphragm of a speaker used for
various audiovisual devices and the like.
[0002]
In recent years, with the spread of so-called high vision and wide vision televisions, etc., the
landscape of the screen of the television is becoming general.
On the other hand, however, narrow and thin television sets as a whole are desired from the
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housing situation in Japan.
[0003]
Since a speaker unit for television (hereinafter referred to as a speaker) is usually attached to
both sides of a cathode ray tube, it contributes to increasing the width of the television set.
[0004]
Therefore, a speaker having a slender structure such as a square shape or an oval shape has
conventionally been used for television.
Further, as the width of the cathode ray tube is increased, it is required to further narrow the
width of the speaker, and at the same time, it is also required to improve the sound quality of the
audio corresponding to the high image quality of the screen.
[0005]
In addition, flat-screen TVs using plasma displays and liquid crystal displays from cathode-ray
tubes are increasing, and thinning of speakers is further required.
[0006]
Here, a conventional elongated speaker will be described with reference to FIGS. 14 and 15. FIG.
FIG. 14 shows a plan view of the speaker, and FIG. 15 shows a cross-sectional view in the
direction of the short side.
[0007]
Referring to FIG. 5, reference numeral 501 denotes a rectangular flat diaphragm, 502 denotes a
frame, 503 denotes an edge for vibratably supporting the diaphragm, and 504 denotes a voice
coil for generating a driving force.
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[0008]
The voice coil 504 is a so-called printed coil formed by a conductor pattern on the front and back
surfaces of a diaphragm 501 having a polymer film as a base material, and is formed in a
substantially rectangular shape.
[0009]
A magnetic circuit 508 including a magnet 506 and a yoke 507 is disposed below the diaphragm
501, and a magnetic flux generated in a magnetic gap 509 between the diaphragm 501 and the
magnetic circuit 508 and a driving current applied to the voice coil 504. More driving force is
generated to vibrate the diaphragm 501 to generate sound.
[0010]
For example, Patent Document 1 is known as a speaker using this type of substantially
rectangular diaphragm.
Japanese Patent Application Laid-Open No. 58-47399
[0011]
However, the above-described speaker is strongly required to be further thinned from the onboard equipment side.
[0012]
However, if the diaphragm made of a resin film is designed to be thin in order to reduce the
thickness of the speaker, the shape rigidity of the diaphragm is lowered, and the high frequency
limit frequency of the speaker is lowered. Since it is necessary to make the central portion of the
diaphragm dome-shaped or reinforced by a voice coil bobbin or the like, the height of the central
portion of the diaphragm is increased, and there has been a limit to thinning the speaker in the
conventional diaphragm structure. .
[0013]
An object of the present invention is to provide an excellent speaker capable of solving the
above-mentioned problems, expanding a high frequency band limit frequency, and achieving
thinning.
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3
[0014]
In order to solve the above-mentioned problems, the speaker diaphragm of the present invention
comprises a substantially planar diaphragm, a spiral planar voice coil formed on at least one
surface of the diaphragm, and the planar voice coil. The speaker vibration is excellent in shape
rigidity by forming a reinforced portion apart from the inside and / or the outer periphery and
forming a reinforcing portion in addition to the voice coil on the planar diaphragm. As a board, it
can contribute to thinning of the speaker.
[0015]
As described above, the speaker diaphragm according to the present invention has a flat coil and
a reinforcing portion provided on a diaphragm that is an insulating substrate. With this
configuration, vibration is performed without making the central portion of the diaphragm a
dome shape. The shape rigidity of the plate is improved, the vibration transmission from the
voice coil to the diaphragm becomes good, and the diaphragm can be made thinner while
maintaining the sound quality while expanding the high frequency limit frequency, making the
speaker thin. Can be realized.
[0016]
Hereinafter, one embodiment of the speaker diaphragm of the present invention will be
described with reference to FIGS.
In the description, the same parts as those of the speaker described in the prior art are denoted
by the same reference numerals.
[0017]
(First Embodiment) FIG. 1 is a plan view of a speaker according to an embodiment using the
speaker diaphragm of the present invention, and FIG. 2 is a cross-sectional view in the short side
direction. The scope of claims 1, 2, 3 and 4 will be described.
[0018]
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Referring to FIG. 5, reference numeral 501 denotes a substantially planar and rectangular
diaphragm made of an insulating thin plate such as polyimide or epoxy.
Reference numeral 502 denotes a frame, and reference numeral 503 denotes an edge that
vibratably supports the diaphragm 501.
[0019]
The diaphragm 501 and the edge 503 are bonded by an adhesive 505.
A voice coil 504 generates a driving force.
The voice coil 504 is configured by printed wiring.
The voice coil 504 is formed on both sides of the diaphragm 501, and is constituted by an upper
surface side coil 521 on the upper surface side of the diaphragm 501 and a lower surface side
coil 522 on the lower surface side of the diaphragm 501.
[0020]
Reference numeral 510 denotes an upper surface lead wire, which passes through an upper
surface side coil 521 formed on the upper surface of the diaphragm 501 and leads to a through
hole 512 connecting the upper surface and the lower surface.
Further, it is connected to the lower surface side coil 522 through the through hole 512.
[0021]
The lower surface side coil 522 is wired to the lower surface of the diaphragm 501, and its end is
led to the lower surface side lead wire 511.
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Although not shown, the lower surface side lead wire 511 and the upper surface lead wire 510
are connected to the output end of the audio signal of the external device.
[0022]
A reinforcing wire 121 is formed on a surface of at least one side of the diaphragm 501 on the
inner diameter side of the voice coil 504 by a printed wiring method.
The reinforcing wire 121 does not contact the voice coil 504 in a direction substantially parallel
to the short side of the diaphragm 501 on the inner periphery of the coil 521 wired in the
direction of the long side of the diaphragm.
[0023]
By forming the voice coil 504 and the reinforcing wiring 121 in the same manufacturing process,
it is possible to improve the production efficiency.
[0024]
A magnetic circuit 508 including a magnet 506 and a yoke 507 is disposed under the diaphragm
501, and is applied to the magnetic flux generated in the magnetic gap 509 between the
diaphragm 501 and the magnetic circuit 508 and to the voice coil 504. The driving force is
generated from the driving current to vibrate the diaphragm 501 to generate a sound.
[0025]
The speaker configured as described above has many resonance modes in the audible band
because the diaphragm 501 has a substantially planar structure.
Resonant modes can be roughly classified into those which occur in the long side direction and
those which occur in the short side direction.
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In the long side direction, resonance occurs at a low frequency because the length of the
diaphragm is long.
[0026]
Since the voice coil 504 is disposed so as to drive the entire surface in the long side direction of
the diaphragm 501, resonance occurring in the long side direction of the diaphragm 501 is
suppressed. On the other hand, the resonance generated in the short side direction has a
generated frequency higher than that in the long side direction because the distance of the
diaphragm 501 is short.
[0027]
In order to enhance the performance as a speaker, it is important to increase the resonance
frequency in the short side direction. For that purpose, it is necessary to increase the rigidity of
the diaphragm.
[0028]
In the present embodiment, a plurality of reinforcing wires 121 disposed on the inner peripheral
portion of the planar voice coil 504 of the diaphragm 501 extend in the direction of the short
side of the diaphragm 501 and substantially in the direction of the long side of the diaphragm.
Arranged in parallel, it is made of a lightweight and highly rigid material such as copper or
aluminum.
[0029]
When the diaphragm is made of a polyimide material, its Young's modulus is about 4 × 10 <9>,
and the Young's modulus of copper is as high as 13.0 × 10 <10> by one digit or more.
Therefore, the reinforcing wire 121 works to increase the rigidity in the short side direction of
the diaphragm 501, and the resonance frequency in the short side direction becomes high.
Therefore, the reproduction band of the speaker can be expanded and a low distortion speaker
can be provided.
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[0030]
In the present embodiment, although the diaphragm 501 and the edge 503 have been described
as separate structures, they may be an integral structure made of the same material, and the
same applies to the following embodiments.
[0031]
Further, although the planar voice coil 504 and the reinforcing wiring 121 are described as
being formed on the diaphragm 501 in the above-described embodiment, they are formed on a
plastic film sheet such as a polyimide material, and are formed on the diaphragm 501. It is also
possible to paste and form.
[0032]
(Second Embodiment) FIG. 3 is a plan view of a speaker showing another embodiment of the
speaker diaphragm of the present invention, and FIG. 4 is a cross-sectional view in the short side
direction. It is
[0033]
Referring to FIG. 5, reference numeral 501 denotes a substantially rectangular flat diaphragm
made of a thin plate such as polyimide or epoxy, 502 denotes a frame, and 503 denotes an edge
for vibratably supporting the diaphragm 501.
The diaphragm 501 and the edge 503 are bonded by an adhesive 505.
[0034]
A voice coil 504 generates a driving force.
The voice coil 504 is formed on both sides of the diaphragm 501, and is formed by the upper
surface side coil 521 and the lower surface side coil 522.
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The wiring between the upper surface side coil 521 and the lower surface side coil 522 extends
the end of the upper surface side coil 521 to the through hole 512 and is extended and
connected to the end of the lower surface side coil via the through hole 512.
[0035]
The other end of the upper surface coil 521 forms the upper surface lead wire 510, the other end
of the lower surface side coil 522 forms the lower surface lead wire 511, and the upper surface
lead wire 510 and the lower surface lead wire 511 are voice coils. The two terminals of 504 will
be formed.
[0036]
A plurality of reinforcing wires 201 are extended in the direction of the short side of the
diaphragm, and a plurality of reinforcing wires 201 are arranged substantially in parallel with
the direction of the long side.
An upper surface reinforcing wiring 202 is formed on the upper surface side of the diaphragm
501 and a lower surface reinforcing wiring 203 is symmetrically disposed on the lower surface
side with the diaphragm 501 interposed therebetween.
[0037]
The end 202a of the upper surface reinforcing wiring 202 of the reinforcing wiring 201 and the
end 203a of the lower surface reinforcing wiring 203 are alternately connected to the inner
periphery of the upper surface voice coil 521 and the lower surface voice coil 522, and each end
202a, The reference numeral 203 a is alternately connected to the left and right of the long side
portions of the upper surface voice coil 521 and the lower surface voice coil 522.
[0038]
In this embodiment, since the reinforcing wiring 201 constitutes a sandwich structure in which
the diaphragm 501 is used as a core, the rigidity is enhanced.
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Furthermore, since the voice coil 504 is alternately connected in the long side direction and is
alternately connected in the upper and lower sides of the diaphragm 501, the coil is not shorted
in the short side direction. Since the length of the reinforcing wiring 201 can be expanded to the
maximum, the reinforcing effect can be maximized.
[0039]
FIG. 5 is a sound pressure frequency characteristic diagram of the loudspeaker according to the
present embodiment by the finite element method. The shape of the speaker diaphragm 501 is
11 mm wide and 63 mm long, and an approximately roll-shaped edge 503 is formed on the outer
peripheral portion of the diaphragm 501, and a polymer material of 40 micron thickness is used.
In the part, it was assumed that the reinforcing wiring was formed at intervals of 3 mm in the
short side direction with a width of 0.1 mm.
[0040]
The dotted line in FIG. 5 indicates the sound pressure frequency characteristics of the speaker in
the case where there is a reinforcing wire and the solid line in the case where there is a
reinforcing wire. It was estimated that the reproduction frequency was increased from 10 kHz to
17 kHz by the reinforcement wiring.
[0041]
In the first and second embodiments described above, the shapes of the diaphragm 501 and the
voice coil 504 are rectangular, but the shapes of the diaphragm and the coil are different in
length in the longitudinal direction and in the lateral direction. The shape is not limited, and the
length in the longitudinal direction and the length in the lateral direction may be the same.
[0042]
Even in the case of a diaphragm having the same shape in the longitudinal direction and the
lateral direction, the rigidity can be increased by forming a reinforcing layer (wiring) in the
central portion thereof.
[0043]
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Besides, the shapes of the diaphragm and the coil may be elliptical or the like.
Further, the voice coil 504 may be a flat coil formed by planarly winding a coated wire instead of
printed wiring.
[0044]
Third Embodiment FIG. 6 is a plan view showing a speaker in another embodiment, which mainly
describes claim 6. In FIG.
[0045]
The difference from the first embodiment is that the reinforcing wires 301 are formed in a lattice
shape in the direction extending along the long side direction and the short side direction of the
diaphragm 501.
With this configuration, the rigidity in the long side direction and the short side direction of the
diaphragm 501 is improved.
[0046]
(Fourth Embodiment) FIG. 7 is also a plan view showing a speaker in another other embodiment,
and the seventh and eighth embodiments will be mainly described.
[0047]
The difference with the loudspeaker of the first embodiment is that a plurality of reinforcing
wires 401 are provided in a substantially parallel manner in a long side direction with a
predetermined inclination, and FIG. 8 is a development example of the loudspeaker of FIG. The
difference with this is that the reinforcing wires 401 and 402 on the front and the back of the
diaphragm 501 are reversely inclined on the front and the back of the diaphragm 501, and the
“X” -shaped reinforcing portion consisting of the reinforcing wires 401 and 402 when viewed
from above A plurality of these are arranged in the long side direction, and in the inner
peripheral portion of the coil portion 504, an effect of enhancing rigidity in both the long side
direction and the short side direction is exhibited.
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[0048]
(Fifth Embodiment) FIGS. 9 and 10 are also for explaining a speaker using a speaker diaphragm
of another embodiment different from the above-mentioned other embodiments, and FIG. 9 is a
plan view. FIG. 10 shows a cross-sectional view in the short side direction, mainly explaining
claim 1.
[0049]
Referring to this figure, only differences from Embodiment 1 will be explained. 701 is a
reinforcing wire formed on the outer periphery of lower surface side coil 522 provided on the
back side of voice coil 504, and the strength of the outer peripheral portion of diaphragm 501 To
suppress the abnormal vibration amplitude of the outer peripheral portion of the diaphragm due
to the edge resonance, and improve the flatness of the sound pressure frequency characteristic.
The reinforcing wiring 121 provided in the first embodiment is deleted.
[0050]
(Embodiment 6) FIG. 11 is also a plan view of a speaker according to another embodiment of the
present invention, and FIG. 12 shows a cross-sectional view in the direction of the short side of
the speaker. is there.
The difference from the first embodiment is that, in addition to the reinforcing wiring 121 of the
first embodiment, the reinforcing wiring 701 of the fifth embodiment is also formed.
[0051]
As described above, since the reinforcing wires 121 and 701 are provided on the inner and outer
peripheries of the voice coil 504, the high-frequency reproduction limit frequency can be
improved and the flatness of the frequency characteristic can be also improved.
[0052]
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Seventh Embodiment FIG. 13 is also a plan view of a loudspeaker according to another
embodiment of the present invention.
Referring to this figure, only differences from Embodiment 1 will be described. The upper surface
lead wire 510 is drawn from one end in the short side direction of the diaphragm 501, and the
user terminal 971 of the frame on the other end side by the lead wire portion 952. , And pulls
out the lower surface side lead wire 511 from one end of the diaphragm 501 on the opposite
side to the upper lead wire 510 in the short side direction, and passes through the lead portion
962 to the user terminal 972 of the other end side frame. It is a connected point.
[0053]
In the present embodiment, by configuring the lead wire portion 952 from the lead wire 510 to
the user terminal 971 to have a maximum length, the stiffness of the lead wire portion can be
reduced.
[0054]
The lead wire 511 and the user terminal 972 also have the same relationship via the lead wire
portion 962.
[0055]
For this reason, while being able to suppress the raise of the lowest resonant frequency of a
speaker, the connection to a user side terminal is enabled, without adhering a lead wire to a
planar coil, and a number of components and an assembly man-hour can be reduced. .
[0056]
In the speaker diaphragm according to the present invention, the shape rigidity of the diaphragm
is improved without making the central portion of the diaphragm a dome shape, the vibration
transmission from the voice coil to the diaphragm becomes good, and the high frequency band
The diaphragm can be made thinner while maintaining the sound quality while maintaining the
sound quality, and the speaker can be made thinner, so that the shape stability of the diaphragm,
the improvement of the speaker characteristics, the reduction of distortion, and the price
reduction are further realized. Video and audio equipment and information communication
equipment that can be applied to applications such as speaker diaphragms and speakers used for
various audio devices that need to be integrated, as well as various electronic devices and various
devices, and that require thinning and downsizing, The present invention can be applied to
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electronic devices such as game machines and devices such as automobiles.
[0057]
The top view of the speaker in one embodiment using the speaker diaphragm of the present
invention The sectional view in the short side direction of the speaker The top view of the
speaker using the speaker diaphragm of other embodiments The cross section in the short side
direction Sound pressure frequency characteristics of the speaker according to the present
embodiment by the figure finite element method. Top view of the speaker in another
embodiment of the speaker diaphragm of the present invention. A plan view of the loudspeaker A
plan view of the loudspeaker of the same development example A plan view of a loudspeaker
using a loudspeaker diaphragm of another embodiment different from the other embodiments
Another sectional view of the loudspeaker according to the short side direction of the present
invention Top view of the speaker using the speaker diaphragm of the other embodiment
Sectional view in the same short side direction of the speaker The plan view of the speaker using
the speaker diaphragm of the other embodiment of the present invention Conventional slim type
Top view of speaker Sectional view in side direction
Explanation of sign
[0058]
121 reinforcement wiring 501 diaphragm 502 frame 503 edge 504 voice coil 505 adhesive 506
magnet 507 yoke 508 magnetic circuit 509 magnetic gap 510, 511 lead wire 512 through hole
521 upper coil 522 lower coil
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