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JP2007049326

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007049326
To provide a flat speaker in which disconnection at a lead portion of a voice coil is not easily
generated. A voice coil in which at least one or more spirals are formed, a lead portion which is
drawn out from the voice coil and reinforced by a reinforcing portion, and a feed line provided at
an end of the lead portion A flat loudspeaker comprising: a diaphragm; an edge portion on which
the diaphragm is supported; and a yoke on which the edge portion is supported and which is
provided with a permanent magnet provided at a position facing the voice coil. [Selected figure]
Figure 1
Flat speaker
[0001]
The present invention relates to a thin flat speaker.
[0002]
In recent years, flat-panel speakers have been developed to meet the needs for thinner and
lighter LCD TVs, automobiles and the like.
For example, in the flat speaker disclosed in Patent Document 1, a driving force is generated on
the entire surface of a flat diaphragm, so that a flat wave is emitted as a flat sound source and the
phase is flat. Furthermore, since paper is not used as in the conventional cone-type speaker, it is
excellent in heat resistance and moisture resistance, can be driven in water, and is small in how
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small each sound cell is hard to cause howling. Furthermore, it has the distinctive feature of
being ultra thin and light with a thickness of 1 cm or less, having a small number of parts, and
having an extremely simple structure.
[0003]
Here, the configuration of a conventional flat loudspeaker will be described in detail with
reference to the drawings. FIG. 6 is a cross-sectional view showing an example of a conventional
flat loudspeaker. The flat speaker 500 shown in FIG. 6 includes a flat plate-like yoke 1 made of
an iron plate (ferromagnetic metal plate), and a plurality of permanent magnets 3 attached to one
side of the yoke 1 with the magnetic axis perpendicular. The permanent magnets 3 are attached
at predetermined intervals in the plane direction of the yoke so that the polarities of adjacent
ones are opposite.
[0004]
Furthermore, the flat speaker 500 is joined to the shelf 1b of the yoke on the peripheral wall 1a
of the yoke 1, and a portion thereof is referred to as an auxiliary portion (hereinafter referred to
as an edge). A diaphragm 7 which is joined with an adhesive material such as an adhesive
through the edge portion 5 and is supported movably while maintaining a desired distance from
the pole face of the permanent magnet 3 There is. In FIG. 6, the edge portion 5 is indicated by
oblique lines.
[0005]
The diaphragm 7 is formed of an insulating base film or the like, and a voice coil is formed on at
least one or more spirals spirally or meandered corresponding to the permanent magnet 3 on
both sides (or even one side) of the diaphragm 7. 9 is formed. All voice coils 9 are connected
such that current having the same direction flows in adjacent sides of adjacent voice coils 9.
Further, in the yoke 1, a plurality of holes (not shown) are formed between the permanent
magnets 3 in order to adjust the variation of the air pressure caused by the vibration of the
diaphragm 7.
[0006]
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FIG. 7 is a plan view of the flat loudspeaker 500 described above. In FIG. 7, the frame-shaped
edge portion 5 is joined to the yoke 1 according to the shape, and the diaphragm 7 is joined to
the edge portion 5. In the diaphragm 7, five voice coils 9 in the longitudinal direction and three
voice coils 9 in the vertical direction are densely provided on a flat surface, and a voltage is
applied to the voice coil 9 through the feed line 11.
[0007]
In the flat speaker 500 configured as described above, a current flows through each voice coil 9,
and the diaphragm 7 is driven up and down on almost the entire surface. Unexamined-JapanesePatent No. 2003-284187
[0008]
In the flat speaker 500 described above, in order to increase the conversion efficiency of
converting the electric signal to the vibration of the diaphragm 7, it is effective to reduce the
weight of the diaphragm 7 by thinning the insulating base film, but the amplitude amount is
increased. As a result, concentration of stress is caused, and there is a problem that the voice coil
9 is broken.
[0009]
In particular, a mounting portion (hereinafter referred to as a lead portion) of a feed line
electrically connected to the voice coil 9 provided in a portion close to the end of the diaphragm
7.
13.) In the vicinity of 13 is a place where a high rigidity feed line 11 is disposed on the flexible
diaphragm 7, so stress concentration is likely to occur and disconnection of the voice coil 9 is
likely to occur.
[0010]
The present invention has been made in view of the above-described problems, and provides a
flat speaker in which disconnection of the lead portion of the voice coil is less likely to occur.
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[0011]
A first aspect of the flat loudspeaker according to the present invention is provided at a voice coil
in which at least one or more spirals are formed, a lead section drawn from the voice coil and
reinforced by a reinforcement section, and an end of the lead section Providing a diaphragm
constituted by the feed line to be fed, an edge portion on which the diaphragm is supported, and
a yoke on which the edge portion is supported and provided with a permanent magnet provided
at a position facing the voice coil. It is a flat speaker to be characterized.
[0012]
A second aspect of the flat loudspeaker according to the present invention is the flat loudspeaker
characterized in that the reinforcing portion is an edge portion.
[0013]
A third aspect of the flat loudspeaker according to the present invention is the flat loudspeaker
characterized in that the reinforcing portion is a resin material.
[0014]
A fourth aspect of the flat loudspeaker according to the present invention is the flat loudspeaker
characterized in that the reinforcing portion is an adhesive.
[0015]
According to a fifth aspect of the flat speaker of the present invention, the reinforcing portion is
a first reinforcing portion covering the lead portion and the vicinity of the lead portion, and is
expanded in the longitudinal direction to be symmetrical with the first reinforcing portion to be
symmetrical. It is a flat speaker characterized by being a second reinforcing portion.
[0016]
A sixth aspect of the flat loudspeaker according to the present invention is the flat loudspeaker
characterized in that the reinforcing part covers the lead part and the vicinity of the lead part.
[0017]
A seventh aspect of the flat loudspeaker according to the present invention is the flat
loudspeaker characterized in that the reinforcing part covers the vicinity of the lead including the
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voice coil and the lead.
[0018]
As described above, by fixing the lead portion of the flat speaker of the present invention by the
reinforcing member, it is possible to avoid stress concentration in the lead portion and to prevent
disconnection.
Furthermore, by the configuration of the reinforcing member, it is possible to prevent the weight
reduction of the diaphragm and the deterioration of the sound quality.
[0019]
Hereinafter, embodiments of the present invention will be described in detail with reference to
FIGS. 1 to 5.
[0020]
First Embodiment FIG. 1 is a cross-sectional view for explaining a schematic configuration of a
flat loudspeaker according to a first embodiment of the present invention.
As a flat speaker, there is, for example, a flat speaker having an outer dimension of 50 mm × 90
mm × 8 mm.
[0021]
The flat speaker 100 shown in FIG. 1 has a flat plate-like yoke 1 made of a soft iron plate
(ferromagnetic metal plate), and a plurality of permanent magnets 3 are provided thereon.
The plurality of permanent magnets 3 are arranged such that the pole faces of the adjacent
permanent magnets 5 are opposite to each other at a predetermined distance.
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The permanent magnet 3 can have a size of, for example, 7 mm × 7 mm × 2.4 mm.
[0022]
Furthermore, the flat speaker 100 is joined to the shelf 1b of the yoke on the peripheral wall 1a
of the yoke 1 and has a frame-like edge 5 that is partially arched, and an adhesive or the like via
the edge 5 A diaphragm 7 is provided which is bonded with an adhesive material and supported
movably while maintaining a desired distance from the pole face of the permanent magnet 3.
[0023]
The diaphragm 7 has a voice coil 9 in which at least one or more spirals are formed, and each
voice coil 9 is provided at a position facing the pole face of the permanent magnet 3.
Here, the voice coil 9 means one obtained by counting each spiral as one voice coil, and the same
applies to the following embodiments.
The diaphragm 7 and the permanent magnet 3 are disposed substantially parallel to each other
at a predetermined distance.
Further, a lead portion 13 is drawn out from the voice coil 9 and is connected to a feed line 11
provided at an end of the lead portion 13.
[0024]
In the present embodiment, the diaphragm 7 has the spiral voice coil 9 in which at least one or
more spirals are formed. However, the present invention is not limited to this, and an integral
voice coil 9 may be used. Alternatively, the voice coil 9 may be provided, for example,
meandering on the insulating base film.
Furthermore, the permanent magnet 3 is not limited to the one provided with a plurality of
permanent magnets.
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[0025]
FIG. 2 is a plan view of the flat loudspeaker 100 in the first embodiment.
As shown in FIG. 2, in the flat speaker 100 of the present embodiment, a total of 15 of 3 × 5 boil
coils 9 are arranged on both sides of the diaphragm 7.
As apparent from FIG. 2, in the present embodiment, the width of the edge portion 5 is expanded
entirely to cover the diaphragm 7. Along with this, the lead portion 13 and the vicinity thereof
are reinforced by the edge portion 5.
[0026]
Further, in the flat speaker 100 configured as described above, when the diaphragm 7 vibrates
up and down, the air on the front surface of the diaphragm 7 vibrates and emits a sound along
with the vibration, but not only the front surface of the diaphragm 7 The air on the back also
vibrates. In the present embodiment, an air hole (not shown) is provided between the permanent
magnets 3 in the yoke 1 so that the air on the back surface of the diaphragm 7 can escape from
the flat speaker 100 to the outside.
[0027]
That is, the space between the roll portion 6 of the edge portion 5 and the voice coil 9 is
reinforced by the adhesive for bonding and fixing the edge portion 5, the diaphragm 7 and the
edge portion 5, and as a result, the lead portion 13 is reinforced. It will be done.
[0028]
As a result of adopting the configuration as described above to the flat speaker 100, an electric
energy of 20 W is applied to generate sound, and a heat cycle test (cold thermal shock test) is
performed in the range of -10 ° C to 60 ° C. Conventionally, the lead 13 was broken in about
100 hours, but good results were obtained in that the lead 13 was not broken even if the power
amount of about 1000 hours was applied under the same conditions.
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[0029]
Second Embodiment Subsequently, a second embodiment of the flat loudspeaker according to the
present invention will be described.
In addition, the same code | symbol is attached | subjected to the structure similar to each part of
the flat speaker shown by FIG. 1, and the description is abbreviate | omitted.
[0030]
In the flat speaker 200 shown in FIG. 3, the width of the edge portion 5 is expanded in a portion
of the diaphragm 7 that is on the two lead portions 13 and the vicinity thereof, and the periphery
of the lead portion 13 is reinforced.
In the flat speaker 200 of the second embodiment, the width of the edge portion 5 is expanded in
the diaphragm 7 including the two lead portions 13 in the first embodiment to reinforce the lead
portion 13 and the vicinity thereof The weight of the edge increased and the sound quality might
be degraded.
[0031]
In the present embodiment, the weight of the edge portion 5 is further reduced as compared with
the first embodiment by expanding the above-described portion, and the deterioration of the
sound quality is prevented. Also in this embodiment, as a result of conducting the heat cycle test
under the same conditions as in the first embodiment, the same effect can be obtained. Third
Embodiment Next, a third embodiment of the flat loudspeaker according to the present invention
will be described. In addition, the same code | symbol is attached | subjected to the structure
similar to each part of the flat speaker shown in FIG. 1, and the description is abbreviate |
omitted.
[0032]
The flat speaker 300 shown in FIG. 4 is extended in the longitudinal direction to the two lead
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portions 13 of the diaphragm 7 and the vicinity thereof and to the first edge portion 5 a of the
diaphragm 7. The second edge portion 5b which is laterally symmetrical is provided to reinforce
the periphery of the lead portion 13.
[0033]
In the flat loudspeaker 300 according to the third embodiment, the edge 5 is expanded in the
second embodiment with respect to the two lead portions 13 and the vicinity thereof. As a result,
the shape of the expanded edge 5 is left-right asymmetry Become.
Therefore, there is a possibility that the phenomenon that the diaphragm 7 does not vibrate
evenly may occur, and the sound quality may be deteriorated. In the present embodiment, the
edge portion 5 is expanded by extending the edge portion 5 with respect to the two lead portions
13 and portions extending in the vicinity thereof, and a portion that is expanded in the
longitudinal direction and is symmetrical with the portions facing the portion. The shape of is
symmetrical to prevent the deterioration of the sound quality. Also in this embodiment, as a
result of conducting the heat cycle test under the same conditions as in the first embodiment, the
same effect can be obtained.
[0034]
Fourth Embodiment Next, a fourth embodiment of the flat loudspeaker according to the present
invention will be described. In addition, the same code | symbol is attached | subjected to the
structure similar to each part of the flat speaker shown by FIG. 1, and the description is
abbreviate | omitted.
[0035]
In FIG. 5, a flexible, light-weight, heat-resistant plastic member such as MCPET (registered
trademark) or an adhesive is applied only to the portion of the diaphragm 7 that is on the two
lead portions 13. Thus, the area around the lead portion is reinforced.
[0036]
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In the present embodiment, the same portions as those in the second embodiment are reinforced,
and weight reduction can be achieved as compared with the above-described embodiment.
Furthermore, instead of the edge portion 5 used as the reinforcing member in the third
embodiment, by using a flexible, lightweight, heat-resistant member, it is possible to reinforce the
second embodiment more firmly than in the second embodiment. Also in this embodiment, as a
result of conducting the heat cycle test under the same conditions as in the first embodiment, the
same effect can be obtained.
[0037]
In the first to fourth embodiments described above, the reinforcing portion such as the expanded
edge portion may include a voice coil. By including the voice coil, the stress generated in the lead
when the diaphragm is oscillated is avoided, and the reliability of the lead is improved.
[0038]
Furthermore, in the planar speaker described above, the number of voice coils is a design matter
of those skilled in the art, and the number is not limited. Furthermore, the present invention is
not limited to the above-described embodiment, and various modifications can be made without
departing from the scope of the invention.
[0039]
By fixing the lead portion of the flat speaker of the present invention by the reinforcing member,
it is possible to avoid stress concentration on the lead portion and to prevent disconnection, and
the industrial applicability is high.
[0040]
It is sectional drawing of the flat speaker in 1st Embodiment.
It is a top view of the flat speaker in 1st Embodiment. It is a top view of the flat speaker in 2nd
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Embodiment. It is a top view of the flat speaker in 3rd Embodiment. It is a top view of the flat
speaker in 4th Embodiment. It is sectional drawing of the conventional flat speaker. It is a top
view of the conventional flat speaker.
Explanation of sign
[0041]
DESCRIPTION OF SYMBOLS 1 yoke 1a yoke peripheral wall 1b shelf of yoke 3 permanent
magnet 5, 5a, 5b edge 6 roll of edge 7 diaphragm 9 voice coil 11 feeder 13 lead 15 input
terminal 17 MCPET (registered trademark) 100 , 200, 300, 400, 500 flat speakers
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