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DESCRIPTION JP2005130186

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DESCRIPTION JP2005130186
PROBLEM TO BE SOLVED: To secure and improve acoustic performance while adopting a
dustproof structure in which the possibility of occurrence of trouble due to foreign matter mixing
into a gap portion of a magnetic circuit is eliminated. SOLUTION: A magnetic circuit composed of
a yoke, a magnet, a plate and a gap portion, a voice coil disposed in the gap portion, a voice coil
bobbin holding the voice coil, and coupling with an interior material are realized. A damper for
covering from the coupler to the back of the magnetic circuit is provided in an exciter for an
interior material direct drive speaker, comprising: Alternatively, the cylinder is protruded from
the coupler, the magnetic circuit is provided with a lid, and a lubricant is applied to a sliding
portion between the cylinder and the lid. Alternatively, a damper is provided between the leaf
spring and the voice coil bobbin. Alternatively, a cushioning material is provided between the leaf
spring and the coupler. [Selected figure] Figure 5
Interior material direct drive speaker exciter
[0001]
The present invention relates to an exciter for a direct drive speaker for an interior material, and
more particularly to a dustproof structure of such an exciter.
[0002]
In order to save the space of the speaker, a speaker according to the NXT system (a technology
developed by New Transducers Limited in the UK) is being adopted instead of the conventional
cone type speaker.
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The NXT speaker vibrates the air by vibrating the surface of the interior material (flat panel) to
generate a sound. Therefore, space saving can be achieved because an enclosure is not required,
and sound can be diffused in a wide range (for example, see Patent Document 1 below).
[0003]
The exciter that vibrates the interior material so as to realize the interior material direct drive
speaker includes a magnetic circuit, a voice coil, a plate spring, a coupler, and the like. However,
in the conventional exciter, the dustproof measure is not applied to the gap of the magnetic
circuit in which the voice coil is disposed, and there is a possibility that a defect may occur due to
the inclusion of foreign matter in the gap.
[0004]
In addition, if the weight of the coupler is reduced by simplifying the shape and removing the
extra thickness to improve the sound quality, foreign matters are mixed from both the front and
back sides of the plate spring, which makes it more difficult to prevent dust. It becomes.
[0005]
Japanese Patent Application Publication No. 2003-143690
[0006]
The present invention has been made in view of the above-described problems, and its object is
to adopt a dustproof structure which eliminates the possibility of occurrence of a defect due to
foreign matter mixing in the gap portion of the magnetic circuit, and to secure sound
performance and An object of the present invention is to provide an exciter for an interior
material direct drive speaker, which is intended to be improved.
[0007]
In order to achieve the above object, according to a first aspect of the present invention, a yoke
in the form of a bowl, a plate-like magnet disposed in the yoke, a plate disposed on the upper
side of the magnet, and A magnetic circuit comprising a gap formed between an inner side wall
and an outer wall of the plate, a voice coil disposed in the gap, and a voice coil bobbin holding
the voice coil. An exciter for an interior material direct drive speaker, comprising: a coupler for
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realizing coupling with an interior material; and a leaf spring which enables the coupler to
vibrate in the axial direction with respect to the magnetic circuit, the coupler to the magnetic
circuit An exciter for driving an interior material direct drive speaker is provided, characterized
in that a damper is provided to cover the rear surface.
[0008]
Further, according to the second aspect of the present invention, in the exciter according to the
first aspect, the damper is more flexible than the leaf spring.
[0009]
Further, according to the third aspect of the present invention, a bowl-like yoke, a plate-like
magnet disposed in the yoke, a plate disposed on the upper side of the magnet, and an inner side
wall of the yoke and the plate A magnetic circuit including a gap portion formed between the
outer wall and the voice coil, a voice coil disposed in the gap portion, a voice coil bobbin holding
the voice coil, and a coupling with an interior material In an exciter for an interior material direct
drive speaker, comprising a coupler to be realized and a leaf spring enabling the coupler to
vibrate in the axial direction with respect to the magnetic circuit, a cylinder is protruded from the
coupler to cover the magnetic circuit An interior material direct drive speaker exciter
characterized in that a dumping agent is applied to a sliding portion between the cylinder and the
lid.
[0010]
Further, according to the fourth aspect of the present invention, a yoke in the form of a bowl, a
plate-like magnet disposed in the yoke, a plate disposed on the upper side of the magnet, and the
inner side wall of the yoke and the plate A magnetic circuit including a gap portion formed
between the outer wall and the voice coil, a voice coil disposed in the gap portion, a voice coil
bobbin holding the voice coil, and a coupling with an interior material In an exciter for an interior
material direct drive speaker, comprising a coupler to be realized and a leaf spring enabling the
coupler to vibrate in the axial direction with respect to the magnetic circuit, a damper is provided
between the leaf spring and the voice coil bobbin. An exciter for driving an interior material
direct drive speaker, characterized in that it is provided.
[0011]
Further, according to a fifth aspect of the present invention, in the exciter according to the fourth
aspect, the damper is more flexible than the leaf spring.
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[0012]
Further, according to the sixth aspect of the present invention, in the exciter according to the
fourth aspect, the weight of the coupler is reduced according to the provision of the damper.
[0013]
Further, according to a seventh aspect of the present invention, there is provided a bowl-like
yoke, a plate-like magnet disposed in the yoke, a plate disposed on the upper side of the magnet,
and an inner side wall of the yoke and the plate A magnetic circuit including a gap portion
formed between the outer wall and the voice coil, a voice coil disposed in the gap portion, a voice
coil bobbin holding the voice coil, and a coupling with an interior material In an exciter for an
interior material direct drive speaker, comprising a coupler to be realized and a leaf spring
enabling the coupler to vibrate in the axial direction with respect to the magnetic circuit, a
cushioning material is provided between the leaf spring and the coupler. An exciter for driving an
interior material direct drive speaker, characterized in that it is provided.
[0014]
Further, according to the eighth aspect of the present invention, in the exciter according to the
seventh aspect, the cushion material is more flexible than the leaf spring.
[0015]
Further, according to the ninth aspect of the present invention, in the exciter according to the
seventh aspect, the expansion ratio of the cushion material is adjusted so that the bottom of the
voice coil bobbin is prevented.
[0016]
Further, according to the tenth aspect of the present invention, in the exciter according to the
seventh aspect, the weight of the coupler is reduced in accordance with the provision of the
cushioning material.
[0017]
According to the present invention, the possibility of foreign matter getting mixed in the gap
portion of the magnetic circuit is eliminated, and the problems associated with such mixing are
prevented.
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Also, according to the second, fifth and eighth aspects of the present invention, sound
performance is further secured, and according to the sixth and tenth aspects of the present
invention, acoustic performance is improved. .
Further, according to the ninth aspect of the present invention, the possibility of the occurrence
of a failure due to the bottom of the voice coil bobbin is eliminated.
[0018]
Hereinafter, embodiments of the present invention will be described with reference to the
accompanying drawings.
First, in order to facilitate understanding of the present invention, an exciter for a direct drive
speaker for an interior material, which does not employ the dustproof structure according to the
present invention, will be described as a reference example.
[0019]
1 and 2 are views showing an exciter for direct driving of an interior material according to a first
reference example, wherein FIG. 1 (A) is a front view, FIG. 1 (B) is a rear view, and FIG. It is a
fragmentary sectional view which meets cutting line XX of 1 (A).
[0020]
In these drawings, reference numeral 12 denotes a bowl-shaped yoke, reference numeral 14
denotes a plate-like magnet disposed in the yoke 12, and reference numeral 16 denotes a plate
disposed on the upper side of the magnet 12.
Reference numeral 18 denotes a gap formed between the inner side wall of the yoke 12 and the
outer side wall of the plate 16.
The yoke 12, the magnet 14, the plate 16 and the gap portion 18 constitute a magnetic circuit
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10.
[0021]
In addition, what is indicated by a reference numeral 20 is a voice coil disposed in the gap
portion 18 of the magnetic circuit 10.
The coupler indicated by reference numeral 30 supports the voice coil bobbin 22 holding the
voice coil 20, and realizes coupling with an interior material (not shown).
Furthermore, a leaf spring 40 is provided which enables the coupler 30 to vibrate in the axial
direction with respect to the magnetic circuit 10.
[0022]
In the exciter shown in FIG. 1 and FIG. 2, as shown by the arrow P in FIG. 2, since the dust entry
path is formed by the gap of the plate spring 40, foreign matter is mixed in the gap portion 18 of
the magnetic circuit 10. And problems may occur.
[0023]
FIGS. 3 and 4 are diagrams showing an exciter for an interior material direct drive speaker
according to a second reference example, wherein FIG. 3 (A) is a plan view, FIG. 3 (B) is a front
view, FIG. Is a rear view, FIG. 3 (D) is a bottom view, and FIG. 4 is a cross-sectional view taken
along the cutting line XX in FIG. 3 (B).
[0024]
In these drawings, reference numeral 110 denotes a magnetic circuit, reference numeral 112
denotes a yoke, reference numeral 114 denotes a magnet, reference numeral 116 denotes a
plate, and reference numeral 118 denotes a gap portion.
Reference numeral 120 denotes a voice coil, and reference numeral 122 denotes a voice coil
bobbin.
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Further, reference numeral 130 denotes a coupler, and reference numeral 140 denotes a leaf
spring.
[0025]
Also in the exciter shown in FIGS. 3 and 4, like the exciter shown in FIGS. 1 and 2, foreign matter
is mixed in the gap portion 118 of the magnetic circuit 110 via the dust entry path shown by the
arrow P in FIG. And problems may occur.
[0026]
In addition, as shown in these figures, the exciter shown in FIGS. 3 and 4 is subjected to
simplification of its shape, removal of excess thickness, etc. in order to reduce the weight of the
coupler for the purpose of improving the sound quality. There is.
Therefore, since the hole of the coupler 130 also forms a dust entry path as shown by the arrow
Q in FIG. 4, the possibility of the occurrence of a defect due to the foreign matter being mixed in
the gap portion 118 of the magnetic circuit 110 is increased. .
[0027]
The present invention provides a dustproof structure for solving the problems of the reference
example described above.
FIG. 5 is a partial cross-sectional view showing a first embodiment of an exciter for direct driving
of an interior material according to the present invention.
[0028]
The yoke 212, the magnet 214, the plate 216 and the gap portion 218 which constitute the
magnetic circuit 210 are the same as those in the first embodiment described above.
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Also, the voice coil 220, the voice coil bobbin 222, the coupler 230 and the plate spring 240 are
also provided as in the first embodiment.
[0029]
In the exciter of FIG. 5, a wedge-shaped damper 250 is further provided, which covers from the
coupler 230 to the back surface of the magnetic circuit 210.
Therefore, the dust entry path as shown by arrow P in FIG. 2 is not formed, and the possibility of
foreign matter mixing in the gap portion 218 of the magnetic circuit 210 is eliminated.
[0030]
Here, the damper 250 is more flexible than the plate spring 240.
Therefore, the addition of the damper 250 does not affect the vibration of the exciter, and the
acoustic performance is secured as before the addition.
[0031]
FIG. 6 is a partial sectional view showing a second embodiment of the exciter for direct driving of
an interior material according to the present invention.
The yoke 312, the magnet 314, the plate 316 and the gap portion 318 which constitute the
magnetic circuit 310 are the same as those in the first embodiment described above.
Also, the voice coil 320, the voice coil bobbin 322, the coupler 330 and the plate spring 340 are
also provided as in the first embodiment.
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Note that a dustproof weir is attached to the outer wall of the yoke corresponding to the air
venting hole provided in the bottom portion (yoke).
[0032]
In the exciter of FIG. 6, the barrel 350 is protruded from the coupler 330. Also, the magnetic
circuit 310 is provided with a lid 360 made of metal or resin. Then, a lubricant is applied to the
sliding portion between the cylinder 350 and the lid 360. Therefore, the lid 360 moves up and
down inside the cylinder 350 via the lubricant.
[0033]
Thus, also in the second embodiment, as in the first embodiment, the dust entry path as shown
by the arrow P in FIG. 2 is not formed, and foreign matter is mixed in the gap portion 318 of the
magnetic circuit 310. The possibility of doing so is excluded.
[0034]
FIG. 7 is a partial sectional view showing a third embodiment of the exciter for direct driving of
the interior material according to the present invention.
The yoke 412, the magnet 414, the plate 416 and the gap portion 418 constituting the magnetic
circuit 410 are the same as those in the second embodiment described above. Also, a voice coil
420, a voice coil bobbin 422, a coupler 430 and a leaf spring 440 are also provided as in the
second embodiment.
[0035]
In the exciter of FIG. 7, an annular damper 450 having a cross-sectional shape shown in FIG. 7 is
provided between the leaf spring 440 and the voice coil bobbin 422. Therefore, the foreign
matter entry path as shown by arrow P in FIG. 4 and the foreign matter entry path as shown by
arrow Q in FIG. 4 are not formed, and foreign matter is mixed in gap portion 418 of magnetic
circuit 410. The possibility of doing so is excluded.
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[0036]
Here, the damper 450 is more flexible than the leaf spring 440. Therefore, the addition of the
damper 450 does not affect the vibration of the exciter, and the acoustic performance is secured
as before the addition.
[0037]
Furthermore, according to the exciter of FIG. 7, as described above, since the dust entry path as
shown by the arrow Q of FIG. 4 is not formed, the coupler 430 is the coupler of the second
embodiment described above. There is no defect even if it is the same as 130, that is, it is
possible to reduce the weight of the coupler and improve the acoustic performance by
simplifying the shape, removing the extra thickness and the like.
[0038]
FIG. 8 is a partial sectional view showing a fourth embodiment of the exciter for direct driving of
an interior material according to the present invention.
The yoke 512, the magnet 514, the plate 516 and the gap portion 518 which constitute the
magnetic circuit 510 are the same as those in the second embodiment described above. Also, a
voice coil 520, a voice coil bobbin 522, a coupler 530 and a leaf spring 540 are also provided as
in the second embodiment.
[0039]
In the exciter of FIG. 8, a doughnut-shaped cushioning member 550 having a cross-sectional
shape shown in FIG. 8 is provided between the leaf spring 540 and the coupler 530. Therefore,
the foreign matter entry path as shown by arrow P in FIG. 4 and the foreign matter entry path as
shown by arrow Q in FIG. 4 are not formed, and foreign matter is mixed in gap portion 518 of
magnetic circuit 510. The possibility of doing so is excluded.
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[0040]
Here, the cushioning material 550 is made more flexible than the leaf spring 540. Therefore,
addition of the cushioning material 550 does not affect the vibration of the exciter, and the
acoustic performance is secured as before addition.
[0041]
In addition, the expansion ratio of the cushioning material 550 is adjusted so as not to collide
with the yoke 512 even if the voice coil bobbin 522 moves up and down, that is, the bottom
contact is prevented.
[0042]
Furthermore, according to the exciter of FIG. 8, as described above, since the dust entry path as
shown by the arrow Q in FIG. 4 is not formed, the coupler 530 is the coupler in the second
embodiment described above. There is no defect even if it is the same as 130, that is, it is
possible to reduce the weight of the coupler and improve the acoustic performance by
simplifying the shape, removing the extra thickness and the like.
[0043]
It is a figure which shows the exciter for interior material direct drive speakers which concerns
on a 1st reference example, Comprising: (A) is a front view, (B) is a front view which removed the
coupler.
It is a fragmentary sectional view which meets cutting plane line XX of FIG. 1 (A).
It is a figure showing an exciter for interior material direct drive speakers concerning the 2nd
reference example, and (A) is a top view, (B) is a front view, (C) is a back view, (D) is a bottom
view, is there. It is sectional drawing in alignment with cutting-plane line XX of FIG. 3 (B). It is a
fragmentary sectional view showing a first embodiment of an exciter for direct driving of an
interior material according to the present invention. It is a fragmentary sectional view showing a
second embodiment of an exciter for direct driving of an interior material by the present
invention. It is a fragmentary sectional view showing a third embodiment of an exciter for direct
driving of an interior material according to the present invention. It is a fragmentary sectional
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view showing a fourth embodiment of an exciter for direct driving of an interior material by the
present invention.
Explanation of sign
[0044]
10, 110, 210, 310, 410, 510 ... Magnetic circuit 12, 112, 212, 312, 412, 512 ... Yoke 14, 114,
214, 314, 414, 514 ... Magnet 16, 116, 216, 316, 416, 516 ... plate 18, 118, 218, 318, 418, 518
... gap portion 20, 120, 220, 320, 420, 520 ... voice coil 22, 122, 222, 322, 422, 522 ... voice coil
bobbin 30, 130, 230 , 330, 430, 530 ... Coupler 40, 140, 240, 340, 440, 540 ... Flat spring 250 ...
Damper 350 ... Tube 360 ... Lid 450 ... Damper 550 ... Cushion material
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