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JPS61294994

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DESCRIPTION JPS61294994
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
edge structure in a speaker, and more particularly to a so-called tangential type edge structure.
(Prior Art) Conventionally, as an edge structure of a speaker, a cotton cloth impregnated with a
phenol resin and heat-pressed is generally used, but in recent years various types of tangential
type excellent in weather resistance and transient characteristics are provided. It is done. A
tangential type edge of this type is formed by pressing a large number of triangular ribs 20 on
the surface of a high rigidity thin metal sheet as shown in a plan view in FIG. As shown in FIG. 7
as a cross-sectional view, the bending rigidity is excellent by forming it in a triangular shape.
Here, 72 is a voice coil bobbin fixed to the inner peripheral edge side of the edge 21, 23 is a
diaphragm, 24 is a frame for fixing the outer peripheral edge side of the edge 21, 25 is a magnet,
26 is a top plate, and 27 is a yoke. Show each one. (Problems to be solved by the invention)
However, in the above-described conventional edge structure, as shown in FIG. 8 as a partial
perspective view, a large number of ribs 20 on one side of the edge 2I have the same shape.
Because of this, as shown in the characteristic diagram of FIG. 9, a difference occurs in the
displacement-restoration force characteristic between the protruding side F and the drawing side
R of the edge 21. As a result, asymmetric distortion (secondary distortion) occurs, which causes
the fidelity as a speaker to be significantly degraded. In addition, not only tangential edges, but
generally elastic materials that form an edge show non-linearity and mechanical hysteresis in the
stress-displacement characteristics, but these characteristics cause the increase of strain and the
deterioration of transient characteristics. Improvement was desired. We proposed that the
nonlinearity and mechanical hysteresis be reduced by first dividing the edges into strips and
applying mechanical bias in opposite directions alternately to each edge (Japanese Patent
Publication No. 57-010070). The present invention applies this to further improve the excellent
characteristics of the tangential edge and to improve the sound quality. An object of the present
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1
invention is to provide an edge structure capable of improving the sound quality of a speaker by
improving the above-described physical characteristics. [Configuration of the Invention] (Means
for Solving the Problems) By forming a thin plate, a large number of ribs in the direction of 0 to
90 ° alternate from the inner peripheral edge to the outer peripheral edge with respect to the
tangent of the inner peripheral edge. And the outer peripheral edge is fixed in a planar manner
such that a mechanical bias force is generated to be alternately reverse to each rib. ing.
Further, it includes one in which the rib is formed in a spiral shape. (Function) A large number of
ribs radially from the inner peripheral edge to the outer peripheral direction are formed
alternately by forming a thin plate so that the concavities and convexities are reversed, and the
corrugated portion formed on the outer edge of the edge is planarized The fixation imparts strain
to each rib, which in turn causes an opposite mechanical bias. Therefore, the inner peripheral
edge of the edge is held at the neutral position by canceling out the mechanical bias in each
direction, and the application-displacement characteristic and the restored car displacement
characteristic can be greatly improved especially near the neutral position. Embodiment An
embodiment of an edge structure according to the present invention will be described with
reference to FIGS. 1 to 5. FIG. 1 is a plan view of the whole, FIG. 2 is a perspective view of the
main part, FIG. 3 is a sectional view of the main part, FIG. 4 is a perspective view of the main part
showing an attached state of an edge, and FIG. Displacement-restoring force characteristic
diagram of FIG. The same parts as those described in the prior art are indicated by the same
reference numerals and the description thereof is omitted. In the figure, ▪ indicates the entire
edge, and by forming a thin plate, the rib 1 is formed with many ribs 2 in the tangential direction
of the inner peripheral edge from the inner peripheral edge 1a to the outer peripheral edge
direction 1b. The ribs 2 are formed by press processing or the like so that the unevenness is
alternately formed, and in the embodiment, as shown in FIG. Therefore, at the edge l, the rib 2a
which protrudes to the surface side and is surrounded by the corners 3.4 and 5 and the rib 2b
which protrudes to the back surface side and is surrounded by the corner 6.7.8 are alternately
arranged. Flat portions 9 for bridging adjacent sides are provided between the ribs 2a and 2b,
and the outer edges of the ribs 2a and 2b and the flat portions 9 are fixed to the frame 24. The
buttocks 10 to be extended are integrally extended. The corners 3.5 are located on the outer side
of the rib 2a, while the corners 6.8 are located on the outer side of the rib 2b. It is pre-strained to
be inclined in opposite directions with respect to the horizontal plane, i.e., the mounting surface
H of the frame 24 and the collar portion 10 respectively. Therefore, the cross section of the rib 2
has a shape in which twisting is given alternately as shown in FIG. 3 (A), and the corner 6 on the
rib 2a side is only the arrow a with respect to the mounting surface H On the other hand, the
corners 8 on the side of the rib 2b are positioned to protrude in the back surface Y direction as
indicated by the arrow with respect to the mounting surface H respectively. Therefore, the
corrugated portion 11 is formed in the ridge portion 10 by the strain.
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2
Although the angle of the rib 2 can be formed at an arbitrary angle from the tangential direction
(θ °) to the normal direction (90 °) with respect to the inner peripheral edge 1a, in order to
obtain sufficient compliance, the tangential direction It is desirable to form near. Furthermore,
although the rib 2 showed a straight rib, it is also possible to curve and spiral the rib to obtain
more sufficient compliance. When the corrugated portion 11 of the edge l having the above
configuration is attached to the mounting surface H of the frame 24, the protrusion a is. b is
forcibly pressed against the mounting surface H, and the collar 10 is planarized as shown in FIG.
4 and FIG. As a result, although the shape distortion is eliminated in each of the ribs 2a and 2b,
the bias force shown by the arrow Fo is potentially generated, and when viewed from the entire
edge 1, the bias forces generated in opposite directions are balanced. The edge 1 attached as
described above supports a vibration system (not shown) such as a voice coil bobbin by its inner
peripheral edge 1a, and its vibration characteristics, in particular, displacement-restoration force
characteristics are considered based on FIG. First of all, a rib having a piasca in the same
direction as the moving direction of the vibration system exhibits a characteristic shown by N in
the figure, while a rib having a paisca in a direction opposite to the moving direction of the
vibration system exhibits a characteristic shown in M in the drawing. When these characteristics
are viewed from the vibration system, the stress generated in each rib is integrated and averaged
and becomes a characteristic shown by S in the figure. Therefore, the displacement-restoration
force is completely proportional, and an ideal vibration characteristic can be obtained, and
asymmetric distortion and non-linearity can be greatly reduced. [Effects of the Invention]
According to the edge structure of the present invention, by forming a thin plate, a large number
of radial ribs are formed alternately from the inner peripheral edge to the outer peripheral
direction so that the direction of unevenness becomes opposite, Since a mechanical bias is
generated in such a way that each rib is alternately reversed by fixing a wave-shaped portion
formed by distortion accompanying a plane in a planar manner, a speaker resulting from an
inherent characteristic of an edge The second and third distortions can be reduced and further
excellent linearity can be obtained, so that other harmonic distortions can be reduced and the
sound quality can be greatly improved. In addition, since the entire edge can be integrally
formed, the productivity is excellent as compared with the divided edge, and moreover, it is
possible to apply bias color only by attaching it to a frame or the like. There is.
[0002]
Brief description of the drawings
[0003]
1 to 5 show an embodiment of the edge structure according to the present invention, FIG. 1 is a
plan view of the whole, FIG. 2 is a perspective view of the main part, FIG. 3 is a sectional view of
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3
the main part, FIG. 4 is a perspective view of the main part showing the attached state of the
edge, and FIG. 5 is a characteristic diagram of displacement-restoring force of the edge.
6 to 9 show a conventional edge structure, FIG. 6 is a plan view, FIG. 7 is a sectional view, FIG. 8
is a partial perspective view, and FIG. 9 is a characteristic view. Whole edge: 2: Whole rib 2a, 2b:
Rib, 11: Wave-shaped part Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure
9
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