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JPS5690696

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPS5690696
A roll-shaped edge provided on the outer periphery of a cone-shaped speaker cone has a
diamond pattern structure configured by a combination of small triangles, and expansion and
contraction in the circumferential direction of the edge due to displacement of the cone is
displacement of the cone and A cone-shaped speaker characterized in that it is performed in
conjunction.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cone-shaped
speaker suitable for use as an electro-acoustic transducer of each sound retaining device, and in
particular, to enable reproduction of good sound No. 4i free from mechanical distortion.
Heretofore, as shown in FIG. 1, a cone-shaped speaker has been proposed. That is, in FIG. 1, (1) is
a permanent magnet, (2) is a pole piece, (3) is a ball yoke, (4) is a voice coil, (5) is a voice coil, and
(6) hachone, (7) Dust cap, (8) Frame, t9) +! Dampers provided to hold the cone (6) correctly with
respect to the permanent magnet (1) and to be free of tilt with respect to axial movement, the
end of mechanical vibration of the cone (6) being four Is a roll-shaped edge made of paper or the
like which forms a U-shaped hook, and Uυ is a stopper for fixing this edge 4 to the frame (8).
Thus, since the conventional cone-shaped speaker as shown in FIG. 1 is configured, the radius
from the central axis O (not shown) of the vibrating yarn of the edge H of this cone-shaped
speaker is the cone (6 It will change each time according to the vibration of). That is, as shown in
FIG. 2A, focusing on the neutral position ltP of the edge Uω where the distance from the central
axis 0 is R, as shown in FIG. In addition, for positive displacement in the direction in which the
cone (6) moves away from the frame (8), since the distance from the central axis 0 of the neutral
position iP of the edge (, IQ) is 几 + Δr1, this edge The circumference of the concentric circle
centered on the central axis 0 including the neutral position P of u [ll increases from 2ππ to 2π
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(B + Δr1), and as shown in FIG. 2C, the cone (6) For a negative displacement in the direction
EndPage: 1 approaching (8), since the distance from the center 4iIIIO to the neutral position P of
the edge (10) is R-Δr2, the neutral position fitP of this edge α 0 is The circumference of a
concentric circle centered on the central axis O including - reduced to △ r2). In this way, the
edge (11 is subjected to a tensile stress in the circumferential direction when the cone (6) makes
a positive displacement, and conversely when the cone (6) makes a negative displacement, the
circumferential direction Will be subjected to compressive stress. By the way, when a roll-shaped
edge having a semicircular cross-section is configured annularly like the edge U @ of the coneshaped speaker as shown in FIG. 1, if the material is not stretchable, it becomes a rigid body in its
field Is well known. Accordingly, the edge uQ of the cone-shaped speaker as shown in FIG.
The stretchability of the edge material constituting IO) is taken into account to cope with the
tensile stress and compressive stress applied to the edge a0. Therefore, in the case of an edge
material such as paper used at the edge U of a cone-shaped speaker as shown in FIG. 1, buckling
occurs frequently in the case of compressive stress, regardless of tensile stress, In this case, since
the edge 0Q can not absorb the internal stress to the light component in this way, it is a dog that
can generate a rolling mode which adversely affects the sound reproduction of the edge (10). As
described above, according to such a cone-shaped speaker as shown in FIG. 1, the stress in the
circumferential direction applied to the edge dQ can not be absorbed, and buckling or the like
occurs in the edge uO itself. And relatively displacement of the cone (6) causes mechanical
distortion in the sound signal reproduced by the dog's dog cone, particularly the low band sound
signal near the low resonance frequency fo of the cone speaker There was a risk of adverse
effects such as In view of the foregoing, it is an object of the present invention to propose a coneshaped speaker capable of reproducing an excellent audio signal free of mechanical distortion as
described above. Hereinafter, the first embodiment of the cone-shaped speaker according to the
present invention will be described with reference to FIG. In FIG. 3, parts corresponding to FIG. 1
are given the same reference numerals, and the detailed description thereof will be omitted. That
is, in this FIG. 3, an edge u? As shown in FIG. 4N, an enlarged perspective view of a part of this
edge crucible, J has a diamond pattern (so-called Yoshimura pattern) structure formed by a
combination of small triangles to form an annular cone. Is disposed on the outer periphery of In
this case, when paper or the like is used as the edge material and a part of the edge α force
shown in FIG. 4A is developed, a development view as shown in FIG. 4B is obtained, and
conversely, the development of FIG. In the figure, when the radial fracture portion (13a) and the
solid line portion (13b) are alternately bent, it can be configured as shown in FIG. 4A. As shown
in FIG. 4A, when the edge llz configured in this way is bent in the x1 direction as shown in FIG.
4A, it changes in the direction in which the crossing angle of the two planes determined by
adjacent triangles decreases. Then, when it is compressed in the y1 direction and bent in the x2
direction in reverse, the crossing angle of two planes defined by adjacent triangles changes in
parallel to this and extends in the y2 direction. Accordingly, in such a cone-shaped speaker as
shown in FIG. 3, when the cone (6) is not displaced at all as shown in FIG. 5k, the edge rotation is
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such that the distance from the central axis O of the vibration system is R. Focusing on the
neutral position fiQ, as shown in FIG. 5B, for positive displacement in the direction in which the
cone (6) moves away from the frame (8), the neutral position Q of this edge u21 from the central
axis O Since a force in the x2 direction as shown in FIG. 4A is applied to this edge 曲 げ at the
same time as the distance becomes B + Δr1, it is bent. Since the circumference of the concentric
circle centering on central axis 0 including tQ increases from 2 to 2π (approx. + rl) from 几, no
internal stress (tensile stress) is applied to the edge material itself that constitutes the edge strike
.
Similarly, as shown in FIG. 5C, for negative displacement in the direction in which the cone (6)
approaches the frame (8), the neutral position tQ of this edge α force is R- from the central axis
0. At the same time as Δr 2, the force in the x1 direction as shown in FIG. 4A is applied to the
edge (17 J and it is bent, so EndPage: 2 from this edge (the geometrical necessity of 121, the
neutral position itQ of this edge α 2 Because the circumference of the concentric circle centered
on the central axis O including 2 decreases to 2K (kL-Δr2) from 2π, the internal stress
(compressive stress) does not occur at all in the edge material itself that constitutes the edge σ 2
. As described above, the cone-shaped speaker according to the present invention has an edge (an
expansion and contraction in the circumferential direction of 121 is performed in conjunction
with the displacement of the cone (6), so this edge constitutes the edge Since no internal stress is
applied to the material itself, the edge material such as paper constituting the edge uz has no
non-linearity such as buckling at all. Also, like this Etsuji u? There is no internal stress at all in the
edge material itself that composes I, and in addition, edge llz is in the direction in which the
triangle as a component is twisted for rolling mode (direction in which a large force is required)
It is expected that the possibility of producing a rolling mode in the vibration mode of edge α 4
is low. Therefore, such a cone-shaped loudspeaker according to the present invention has
mechanical distortion even when the displacement of the cone (6) is relatively a dog, even if the
low-range audio signal near the low-pass resonant frequency fo Good reproduced signal can be
obtained. In the case of the above-described embodiment, the triangles of the diamond pattern
structure constituting the edge α are configured such that all the side lengths in the radial
direction are equal, but as shown in the developed view of FIG. The length of the radial side of
the triangle may be changed sequentially. In this case, the curvature of the cross section of the
edge tt 2 + is increased, so that, as a matter of course, when there is no displacement of the cone
(6), the bonded end with the cone (6) and the frame (8) It will constitute a cone-shaped speaker
of different heights with the adhesive end of the. In the case of the above embodiment, the
diamond pattern structure as shown in FIG. 4A is used only at the edge of the edge, but as shown
in FIG. 7, the diamond pattern as shown in FIG. Also as a structure, expansion and contraction in
the circumferential direction of the damper u3 is performed in conjunction with the displacement
of the cone (6), and no internal stress is applied to the damper material constituting the damper
u31. It is suitable as well as time.
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The present invention is not limited to the above-described embodiment, and it goes without
saying that various other configurations can be taken without departing from the scope of the
present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 11 is an enlarged cross-sectional view showing an
example of a conventional cone-shaped speaker, FIG. 2 is a diagram for describing FIG. 1, and
FIG. 4A and 4B are an enlarged perspective view and a developed view of a part of the edge of
the present Q bright cone-shaped speaker shown in FIG. 3, respectively, and FIG. 5 is a diagram
for explaining the present invention. 46 k and B are a development view of a part of an edge
showing another embodiment of the edge of the cone-shaped speaker of the present invention
and a diagram for describing the same, and FIG. 7 is another embodiment of the cone-shaped
speaker according to the present invention It is sectional drawing which shows. (6) is a cone, (8)
is a frame, α power is an edge, and u is a damper. EndPage: 3 FIG. 1 In FIG. 2 FIG. 4 End Page: 4
FIG. EndPage: 5
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