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JP2010226373

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DESCRIPTION JP2010226373
The present invention relates to a speaker having an edge supporting a diaphragm and having an
edge having a straight portion and a non-linear portion, wherein the difference in stroke between
the edge of the straight portion and the edge of the non-linear portion is reduced to output better
sound. Provide the technology to A speaker comprising: a diaphragm; a magnetic circuit for
vibrating the diaphragm; a frame connected to the magnetic circuit unit; and an edge provided on
the frame and supporting an outer edge of the diaphragm. An outer edge portion of the
diaphragm has a straight portion and a non-linear portion, and the edge is a straight linear edge
portion supporting the outer edge portion of the diaphragm; and an outer edge of the diaphragm
And a non-linear non-linear edge portion for supporting a portion, wherein the non-linear edge
portion has the same rigidity as the linear edge portion. [Selected figure] Figure 4
????
[0001]
The present invention relates to the technology of a speaker.
[0002]
As a technique regarding the edge which supports the outer periphery of the diaphragm of a
speaker, the technique of patent document 1 is known, for example.
Patent Document 1 discloses a technique for making the cross-sectional shape on the inner
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peripheral side of the edge supporting the diaphragm of the speaker thinner than the crosssectional shape on the outer side.
[0003]
International Publication No. 2004/004410 Pamphlet Japanese Patent Laid-Open No. 200337011 Japanese Patent Laid-Open No. 6-31594 Japanese Patent Laid-open No. 8-102092
Japanese Patent Laid-Open No. 2007-282012
[0004]
As a speaker, a flat type speaker using magnets arranged at equal intervals on a flat plate is
known.
Here, FIG. 1A shows a schematic configuration of a conventional flat loudspeaker, FIG. 1B shows
a plan view of an edge of the conventional flat loudspeaker, and FIG. 1C shows a cross-sectional
view taken along line AA in FIG. As shown in FIG. 1A, the conventional flat loudspeaker 100X
includes a magnet unit 2X, a diaphragm 3X, a coil group 4X including a plurality of coils, and an
edge 5X. The magnet unit 2X is formed by arranging a plurality of magnets 22X at regular and
equal intervals on the frame 21X. The magnet 22 is a rectangular magnet whose end is an N pole
or an S pole, and the plurality of magnets 22 are regularly arranged so that their tips have
different magnetic poles in relation to the adjacent magnets. Is located in Above the magnet 22X,
a coil group 4X including a plurality of coils arranged to correspond to the magnet 22X is
disposed. When the current corresponding to the voice signal is supplied to the coil group 4, the
coil group 4 through which the current flows is received by the magnetic flux of the magnetic
circuit formed by the magnet unit 2X and the coil group 4, and the vibration supported by the
edge 5X The plate 3X vibrates. As a result, sound waves are generated from the flat loudspeaker
100X.
[0005]
Here, in the above-mentioned conventional flat type speaker 100X, in order to support the outer
periphery of the rectangular diaphragm 3X, the edge 5X has a straight portion 51X and a nonlinear portion 52X consisting of four corner portions. Therefore, in the conventional planar
speaker 100X, the rigidity of the straight portion 51 and the non-linear portion 52X, that is, the
four corner portions is different. More specifically, in the conventional planar speaker 100X, the
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rigidity of the non-linear portion 52X is higher than the rigidity of the linear portion 51, and as a
result, the minimum resonance frequency (f0) increases and the sound pressure decreases. Is
concerned. The straight portion 51X vibrates more easily than the non-linear portion 52X. In
other words, the stroke of vibration of the straight portion 51X is longer than the stroke of
vibration of the non-linear portion 52X. As a result, in the conventional flat type speaker, the
sound wave from the flat speaker 100X forms a spherical wave instead of a plane wave.
[0006]
Although the flat type speaker has been described as an example in order to explain the problem
in the conventional speaker, the above problems are concerned in various speakers. That is, in
the case where the edge supporting the diaphragm of the speaker is provided with straight
portions and non-linear portions such as corners, if the cross section of the edge has the same
shape, a difference is generated in the stroke of the edge and the sound quality is degraded.
There is a risk of
[0007]
In view of the background described above, the present invention relates to a speaker having an
edge supporting a diaphragm and having an edge having a straight portion and a non-linear
portion, and reducing the difference in the stroke of the edge between the straight portion and
the non-linear portion An object of the present invention is to provide a technology for
outputting better sound.
[0008]
In the present invention, in order to solve the above-mentioned problems, in a speaker provided
with an edge having a straight portion and a non-straight portion, the rigidity of the edge
constituting the speaker is equalized.
[0009]
More specifically, the present invention is provided on a diaphragm, a magnetic circuit portion
for vibrating the diaphragm, a frame connected to the magnetic circuit portion, and the frame,
and supports an outer edge portion of the diaphragm. An edge, wherein the outer edge of the
diaphragm has a straight portion and a non-linear portion, and the edge is a linear straight edge
supporting the outer edge of the diaphragm; And a non-linear non-linear edge supporting the
outer edge of the diaphragm, wherein the non-linear edge has the same rigidity as the linear
edge.
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[0010]
In the loudspeaker according to the present invention, the non-linear edge portion has the same
rigidity as the linear edge portion.
In other words, the entire edge is designed to be the same stiffness.
Stiffness means the hardness of the edge (stiffness).
The straight edge portion is a straight region, and can support the straight portion of the
diaphragm. The non-linear edge portion is a non-linear region of the edges and can support the
non-linear portion of the diaphragm. The straight portion of the diaphragm is exemplified by the
side of the diaphragm. Further, as the non-linear portion of the diaphragm, there may be
mentioned portions other than the linear portion, for example, the corner portion and the curved
portion of the diaphragm. In the speaker according to the present invention, since the non-linear
edge portion has the same rigidity as the linear edge portion, it is possible to reduce the
deterioration in sound quality that may occur when the rigidity is different, and to provide better
sound.
[0011]
The rigidity of the non-linear edge portion and the rigidity of the linear edge portion may be the
same, in other words, the rigidity of the non-linear edge portion and the linear edge portion may
be equalized, for example, by changing the cross-sectional shape of the edge. Specifically, if the
thickness of the non-linear edge is made thinner than the thickness of the linear edge so that the
stroke of the linear edge when the diaphragm vibrates and the stroke of the non-linear edge are
the same. Good. The stroke is the movement of the edge when the diaphragm vibrates once. By
reducing the thickness of the non-linear edge portion, the non-linear edge portion is softened, the
stroke of the non-linear edge portion is improved, and as a result, it is possible to make the
rigidity uniform. The uniformity of the rigidity of the non-straight edge portion and the straight
edge portion may be realized by changing the material of the non-straight edge portion and the
straight edge portion. That is, the non-linear edge may be made of a material softer than the
linear edge so that the stroke of the linear edge when the diaphragm vibrates and the stroke of
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the non-linear edge are the same.
[0012]
Here, the speaker based on this invention mentioned above can be specified as follows as one
aspect | mode. That is, the edge is ring-shaped, provided on the inner side of the edge, and
connected to the diaphragm connection portion connected to the outer edge portion of the
diaphragm, and the frame provided on the outer side of the edge and connected to the frame The
connection portion may be configured to have a curved portion provided between the diaphragm
connection portion and the frame connection portion and curved on the front side of the
diaphragm. Further, the thickness of the curved portion at the non-linear edge portion is such
that the stroke of the linear edge portion when the diaphragm vibrates and the stroke of the nonlinear edge portion are the same. It is preferable to make it thinner than the thickness. By making
the thickness of the curved portion in the non-linear edge portion thinner than the thickness of
the curved portion in the linear edge portion, the stroke of the non-linear edge portion is
improved, and the rigidity can be made uniform.
[0013]
The curved portion may be configured to have at least two curves adjacent in the radial direction
of the edge. By forming the curved portion by two curves, the effective length in the radial
direction of the curved portion compared to one curve, that is, the material itself that constitutes
the edge between the diaphragm connection portion and the frame connection portion Length
will be longer. As a result, the stroke of the non-linear edge can be improved and the rigidity can
be made uniform.
[0014]
Moreover, you may specify as follows the speaker which concerns on this invention mentioned
above as one aspect. That is, the diaphragm is a rectangle having R-shaped corner portions, and
the non-linear portion as the R-shaped corner portion and the straight line as a side formed
between the R-shaped corner portions. It may have a part. The edge may have a non-linear edge
supporting the non-linear portion as the R-shaped corner and a linear edge supporting the linear
portion as the side.
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[0015]
In the present invention, the diaphragm is rectangular, and the edge is also configured in a
rectangular diaphragm. The shape of the diaphragm is not limited to the above, and any shape
may be used as long as it has a linear portion and a non-linear portion at the outer edge. The
loudspeaker according to the present invention is applicable to various loudspeakers using a
diaphragm having a straight portion and a non-straight portion at the outer edge.
[0016]
In the speaker according to the present invention, the non-straight edge and the straight edge
may be arranged such that the stroke of the straight edge when the diaphragm vibrates and the
stroke of the non-straight edge become the same. It may further have a changing edge portion in
which the cross-sectional shape of the edge between the portions gradually changes. If the crosssectional shape is rapidly changed at the boundary between the straight edge portion and the
non-linear edge portion, distortion may occur. By providing the changing edge portion, the
occurrence of distortion can be reduced and the sound quality can be further improved. In order
to make the rigidity of the edge uniform by partially changing the material of the edge, the
material of the change edge portion may gradually change.
[0017]
The changing edge portion may be linear or non-linear. In other words, the change hedge can
indicate at least one of the linear portion and the non-linear portion of the diaphragm. However,
the changing edge portion may support only the straight portion. By gradually changing the
cross-sectional shape of the edge in a portion corresponding to the linear portion of the
diaphragm, the stroke of the non-linear edge portion can be reliably improved. In the present
invention, as compared with the case where the changing edge portion is not provided, the
straight edge portion becomes shorter as much as the changing edge portion is provided.
[0018]
Although the speaker according to the present invention is applicable to various speakers, it can
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also be suitably used for a so-called flat speaker. Specifically, in the speaker according to the
present invention, the magnetic circuit has a plurality of flat plate-like magnets arranged in a
grid, and the diaphragm has a coil portion through which a current corresponding to an audio
signal flows. Alternatively, a coil unit having a plurality of coils corresponding to each of the
plurality of magnets may be provided.
[0019]
The present invention can also be specified as an edge used for the above-described speaker.
That is, according to the present invention, a diaphragm, a magnetic circuit for vibrating the
diaphragm, a frame connected to the magnetic circuit portion, and an edge provided on the
frame and supporting the outer edge portion of the diaphragm An outer edge portion of the
diaphragm having a straight portion and a non-linear portion, the edge being a linear straight
edge portion supporting the outer edge portion of the diaphragm; And a non-linear non-linear
edge portion supporting the outer edge portion of the diaphragm, wherein the non-linear edge
portion is an edge having the same rigidity as the linear edge portion.
[0020]
According to the present invention, with respect to a speaker having an edge supporting a
diaphragm, the edge having a linear portion and a non-linear portion, the difference in stroke
between the edge of the linear portion and the edge of the non-linear portion is reduced. It is
possible to provide a technology that outputs excellent sound.
[0021]
The schematic structure of the conventional flat type speaker is shown.
The top view of the edge of the conventional flat type speaker is shown. AA sectional drawing in
FIG. 1B is shown. The schematic structure of the speaker which concerns on 1st embodiment is
shown. The top view of the magnet unit concerning a first embodiment is shown. The top view of
the edge concerning a first embodiment is shown. AA sectional drawing of FIG. 4 is shown. FIG. 5
is a cross-sectional view taken along a line BB in FIG. 4; CC sectional drawing of FIG. 4 is shown.
The top view of the edge concerning a second embodiment is shown. AA sectional drawing of
FIG. 6 is shown. FIG. 7 is a cross-sectional view taken along a line BB in FIG. CC sectional drawing
of FIG. 6 is shown. The top view of the edge which concerns on 3rd embodiment is shown. FIG. 9
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is a cross-sectional view taken along line AA of FIG. FIG. 9 is a cross-sectional view taken along a
line BB in FIG. CC sectional drawing of FIG. 8 is shown.
[0022]
Next, an embodiment of a speaker of the present invention will be described based on the
drawings.
[0023]
First Embodiment First, a schematic configuration of a speaker 100 according to a first
embodiment will be described.
FIG. 2 shows a schematic configuration of the speaker 100 according to the first embodiment.
The speaker 100 includes a magnet unit 2, a diaphragm 3, and a coil group 4. The magnet unit 2
has a plurality of magnets arranged in a grid on the frame 21. Here, FIG. 3 shows a top view of
the magnet unit 2. As shown in the figure, the magnet 22 is a rectangular magnet whose end is
an N pole or an S pole, and the plurality of magnets 22 have different magnetic poles in which
their tips differ from each other in relation to the adjacent magnets. It is arranged regularly so
that it becomes. The magnet unit 2 of this embodiment is configured by disposing five magnets
22 in the lateral direction and three magnets in the longitudinal direction, for a total of 15
magnets 22 on the horizontally long rectangular frame 21. However, the magnet unit 2 is not
limited to such an aspect. The frame 21 may be, for example, polygonal or circular, and the
shape, arrangement, and total number of the magnets 22 can be appropriately designed in
accordance with the frame 21.
[0024]
The diaphragm 3 is elastically fixed to the frame 21 of the magnet unit 2 via the edge 5. A
predetermined space is provided between the diaphragm 3 and the magnet unit 2. The
diaphragm 3 which concerns on 1st embodiment is a rectangle, and four corner parts are formed
in R shape. The diaphragm 3 has linear portions 25 corresponding to four sides of a rectangle
and non-linear portions 26 corresponding to four R-shaped corner portions. The predetermined
distance between the diaphragm 3 and the magnet unit 2 can be appropriately designed as a
distance such that the diaphragm 3 and the magnet unit 2 do not contact each other when the
diaphragm 3 vibrates. Details of the edge 5 will be described later.
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[0025]
The diaphragm 3 is provided with a coil group 4 composed of a plurality of coils and the like, and
the coil group 4 is connected to a connector 7 provided outside the magnet unit 2 via a tinsel
wire 6. A current corresponding to the audio signal is supplied to the connector 7 from the
outside of the speaker 100 through the cord 8. A protective net may be provided to cover the
diaphragm 3. By providing the protective net, it is possible to prevent the adhesion of dust and
the like to the diaphragm 3 and the coil group 4. The cord 8 can be connected to an amplifier or
the like (not shown). Although the coil group 4 is provided inside the diaphragm 3 in the present
embodiment, the coil group 4 may be provided on the upper surface or the lower surface of the
diaphragm 3. In addition, the coil group 4 may be provided on both the upper surface and the
lower surface of the diaphragm 3.
[0026]
When the current corresponding to the audio signal is supplied to the coil group 4, the coil group
4 through which the current flows is received by the magnetic flux of the magnet unit 2 as a
magnetic circuit, and the diaphragm 3 vibrates. As a result, a sound wave is output from the
speaker 100.
[0027]
Here, the speaker 100 according to the first embodiment is characterized in that the rigidity of
the edge 5 is equalized. Thus, the edge 5 will be described in more detail.
[0028]
FIG. 4 shows a plan view of the edge 5 according to the first embodiment. 5A is a cross-sectional
view taken along line AA of FIG. 4, FIG. 5B is a cross-sectional view taken along line BB of FIG. 4,
and FIG. 5C is a cross-sectional view taken along line CC of FIG. The edge 5 supports the outer
edge of the diaphragm 3 and is designed to match the shape of the outer edge of the diaphragm
3. Specifically, the edge 5 has a rectangular ring shape, and includes a straight edge 511, a non-
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straight edge 52, and a changing edge 533. Further, each of the straight edge 51, the nonstraight edge 52, and the change edge 53 is provided inside the edge 5 and is connected to the
outer edge portion of the diaphragm 3 (diaphragm connection portion 511 of the straight edge
51). , The diaphragm connection portion 521 of the non-linear edge 52, the diaphragm
connection portion 531 of the changing edge 53, and the frame connection portion (frame
connection portion 513 of the linear edge 51) provided outside the edge 5 and connected to the
frame 21. , And the frame connection portion 533 of the non-linear edge 52, the frame
connection portion 533 of the change edge 53, and the linear plate edge provided between the
diaphragm connection portion 511 and the frame connection portion 513 and curved toward the
front surface of the diaphragm 3 There are 51 curved portions 512. The non-linear edge 52 and
the changing edge 53 are similarly provided with a curved portion. In addition, although the
material of the edge 5 is not specifically limited, For example, elastic materials, such as urethane,
rubber | gum, and cloth, can be used. Different hatching in FIG. 4 indicates the area of the
straight edge 51, the non-straight edge 52, and the changing edge 53. For convenience of
explanation, although only a part is shaded, the other part of the edge 5 is also composed of a
straight edge 51, a non-straight edge 52, and a changing edge 53.
[0029]
The straight edge 51 supports the straight portion 25 (side) of the outer edge portion of the
diaphragm 3. The non-linear edge 52 supports the non-linear portion 26 (R-shaped corner) of the
outer edge of the diaphragm 3. The changing edge 53 is provided between the straight edge 51
and the non-straight edge 52, and supports the straight portion 25 near the non-straight portion
26 and the non-straight portion 26 near the straight portion 25. The changing edge 53 is
designed such that its thickness gradually decreases from the end on the non-linear edge 52 side
to the end on the linear edge 51 side.
[0030]
Here, in FIG. 4, FIG. 5A, FIG. 5B and FIG. 5C, the AA cross section is a cross sectional view of the
straight edge 51, the BB cross section is a cross sectional view of the non-linear edge 52, and the
CC cross section is a change edge 53 FIG. Then, as shown in FIGS. 5A, 5B, and 5C, the thickness
d1 of the curved portion 512 of the straight edge 51 is the largest, and the thickness d3 of the
curved portion 522 of the non-linear edge 52 is the smallest. The thickness d2 of the changing
edge 53 is smaller than the thickness d1 of the curved portion 512 of the straight edge 51 and
smaller than the thickness d3 of the curved portion 522 of the non-linear edge 52. It is designed
to be gradually thinner from the end toward the end on the straight edge 51 side. The thickness
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d1 of the straight edge 51, the thickness d3 of the non-linear edge 52, and the thickness d2 of
the change edge 53 can be appropriately designed so that the stroke of the entire edge 5 can be
made uniform when the diaphragm 3 vibrates. .
[0031]
According to the speaker 100 according to the first embodiment, the thickness of the curved
portion 522 of the non-linear edge 52 is thinner than the thickness of the curved portion 512 of
the linear edge 51, in other words, of the non-linear edge 52 The rigidity and uniformity of the
rigidity of the straight edge 51 are realized. As a result, according to the speaker 100 according
to the first embodiment, the difference between the strokes of the non-linear edge 52 and the
linear edge 51 is reduced, and a better sound can be output. Here, in the conventional flat type
speaker (see FIGS. 1A to C), the rigidity of the non-linear portion 52X is higher than the rigidity
of the linear portion 51X, and as a result, the lowest resonance frequency (f0) increases and the
sound pressure There is concern that it will cause a decline. The straight portion 51X vibrates
more easily than the non-linear portion 52X. In other words, the stroke of vibration of the
straight portion 51X is longer than the stroke of vibration of the non-linear portion 52X. As a
result, in the conventional flat type speaker, the sound wave from the flat speaker 100X forms a
spherical wave instead of a plane wave. However, according to the speaker 100 according to the
first embodiment, it is possible to reduce the increase in the lowest resonance frequency (f0) and
the decrease in the sound pressure, and to suppress the formation of the spherical wave.
Furthermore, according to the speaker 100 according to the first embodiment, occurrence of
distortion assumed when the thickness is rapidly changed at the boundary portion between the
straight edge 51 and the non-linear edge 52 by providing the changing edge 53 The sound
quality can be further improved.
[0032]
Second Embodiment Next, a speaker according to a second embodiment will be described based
on the drawings. In the speaker according to the second embodiment, the configuration other
than the edge is the same as the configuration of the speaker 100 according to the first
embodiment described above, so the description of the configuration other than the edge will be
omitted.
[0033]
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Here, FIG. 6 shows a plan view of the edge 5a according to the second embodiment. 7A is a crosssectional view taken along line AA of FIG. 6, FIG. 7B is a cross-sectional view taken along line BB
of FIG. 6, and FIG. 7C is a cross-sectional view taken along line CC of FIG. The edge 5a according
to the second embodiment differs from the edge 5 according to the first embodiment in that the
non-linear edge 52a has two curved portions 5221a and 5222a. That is, the two curved portions
5221a, 5222a are adjacent in the radial direction of the edge 5a. The thickness d3 of the two
curved portions 5221a and 5222a is thinner than the thickness of the curved portion 513a of
the straight edge 51. In the present embodiment, not only the thickness of the change edge 53a
but also the cross-sectional shape itself changes. That is, at the changing edge 53a, the crosssectional shape changes so that two curves become one curve. According to the speaker of the
second embodiment, the practical length, that is, the edge between the diaphragm connection
portion and the frame connection portion, as compared to the edge 5 according to the first
embodiment including one curved portion The length of the constituent material itself (the radial
length of the curved portion) becomes long. As a result, the stroke of the non-linear edge 52a can
be improved, and the rigidity can be made uniform.
[0034]
According to the speaker of the second embodiment, the thickness d3 of the curved portions
5221a and 5222a of the non-linear edge 52a is thinner than the thickness of the curved portion
512a of the linear edge 51a and two curved portions of the non-linear edge 52a By providing
5221a and 5222a, equalization of the rigidity of the non-linear edge 52a and the rigidity of the
linear edge 51a is realized. As a result, according to the speaker according to the first
embodiment, the difference in stroke between the non-linear edge 52 a and the linear edge 51 a
is reduced, and a better sound can be output. And, according to the speaker according to the
second embodiment, as in the speaker according to the first embodiment, the increase of the
lowest resonance frequency (f0) and the decrease of the sound pressure are reduced, and the
formation of the spherical wave is suppressed. Is possible. Furthermore, according to the speaker
100 according to the second embodiment, occurrence of distortion assumed when the thickness
is rapidly changed at the boundary between the straight edge 51a and the non-straight edge 52a
by providing the changing edge 53a. The sound quality can be further improved.
[0035]
Third Embodiment Next, a speaker according to a third embodiment will be described based on
the drawings. In the speaker according to the third embodiment, the configuration other than the
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edge is the same as the configuration of the speaker 100 according to the first embodiment
described above, so the description of the configuration other than the edge will be omitted.
[0036]
Here, FIG. 8 shows a plan view of the edge 5 b according to the third embodiment. 9A is a crosssectional view taken along line AA of FIG. 8, FIG. 9B is a cross-sectional view taken along line BB
of FIG. 8, and 9C is a cross-sectional view taken along line CC of FIG. The edge 5b according to
the third embodiment is the same as the edge 5a according to the second embodiment, and
unlike the edge 5 according to the first embodiment, the non-linear edge 52b has two curved
portions 5221b and 5222b. There is. The non-linear edge 52b is the same as the edge 5a
according to the second embodiment described above in that it has two curved portions 5221b
and 5222b. However, the edge 5 b according to the third embodiment is provided such that the
change edge 53 b supports the linear portion 25 of the diaphragm 3. That is, although the edge
5a according to the second embodiment is provided to support both the non-linear portion 26
and the linear portion 25 of the diaphragm 3, in the edge 5b according to the third embodiment,
the changing edge 53b Is provided so as to support only the linear portion 25 of the diaphragm
3. In other words, as shown in FIG. 8, at the edge 5 b according to the third embodiment, the
changing edge 53 b is the imaginary lines P 1 and P 2 radially extending from the center point O
of R of the non-straight edge It is provided on the side of the straight line edge 51 b than the
point of intersection with the imaginary lines P 1 and P 2 orthogonal to 513.
[0037]
The speaker according to the third embodiment has the following effects in addition to the
excellent effects of the speaker according to the second embodiment. That is, the non-linear edge
52b is completely constituted by the two curved portions 5221b and 5222b, and the linear edge
25 is supported with the changing edge 53 whose shape gradually changes from the two curved
portions 5221b and 5222b to one curved portion 512b. With this configuration, the occurrence
of the phenomenon that the rigidity of the non-linear edge 52b becomes higher than the rigidity
of the linear edge 51b can be suppressed more reliably.
[0038]
The preferred embodiments of the present invention have been described above, but the speaker
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according to the present invention is not limited to these, and can include combinations of these
as much as possible. Further, in the above-described embodiment, the thickness of the non-linear
edge 52 is formed to be thinner than the thickness of the linear edge 51, and the non-linear edge
52, the linear edge, and the changing edge are integrally formed. . However, as long as the
rigidity can be made uniform, the rigidity may be adjusted by, for example, bonding the materials
constituting the edge. For example, the straight edge 51 may be formed by laminating two
materials so that the thickness of the straight edge 51 is greater than the thickness of the nonstraight edge.
[0039]
Reference Signs List 2 magnet unit 3 diaphragm 4 coil group 5 edge 6 tinsel wire 7 connector 8
cord 21 frame 22 22a, 22b 22c иии Magnet 25 иии Straight portion 26 иии Non-linear portion 41, 42,
43, 41a, 42a, 42b иии Coil 51, 51a, 51b иии Straight edge 52, 52a, 52b иии? Non-linear edge 53, 53a,
53b ... changing edge
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