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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
The present invention relates to the structure of a speaker edge, and is particularly suitable for
providing a speaker having a wide linear range of amplitude, low distortion, and high fidelity,
which is very resistant to reciprocation. It aims at providing a speaker edge. Generally, a roll edge
is used for an electrodynamic speaker. FIG. 1 shows a conventional electrodynamic speaker. In
FIG. 1, the lower plate 10. An annular slit 15 is provided in the field portion 14 formed of the
annular magnet 11 and the upper plate 12, and a voice coil 16 is inserted into the annular slit 16
provided in the field portion 14 and the voice coil The wound voice coil bobbin 17 is supported
by a frame 19 fixed to the plate 10 via a damper 18. Also, the cone 20 is supported by the frame
via the edge 21. 22はガスケット、23はダストカバーである。 FIG. 2 is an enlarged view of
the working portion. FIG. 2 shows the movement of the roll edge when the cone is displaced to +
and-. That is, when the cone is displaced by + ξ, one point on the roll edge 21, for example, the
point B moves to the point B ', and when displaced by -ξ moves to the B ′ ′. Therefore, in
order to change in the radial direction by dr1, the point B generates an expansion or contraction
of 2πdT1 in the circumferential direction, and it must be absorbed by the material or the like.
Therefore, if it is a material with poor stretchability such as cloth, longitudinal wrinkles are
generated at the edge, the linearity is bad, and it is inconvenient in occurrence of distortion or
the like. Further, even with a relatively stretchable material such as urethane, the stretchability in
the circumferential direction can not be completely absorbed, and the linearity is deteriorated.
The roll edge is structurally susceptible to twisting due to a lateral displacement force
perpendicular to the direction of the parent axis, and can not be said to be good for rolling. The
present invention solves such conventional drawbacks, and the present invention will be
described below with reference to the drawings of the embodiments. FIG. 3 is a cross-sectional
view of a speaker using the speaker edge of the present invention, and FIG. 4 is a top view
thereof. The voice coil 2 is connected under the flat diaphragm 1, and the coil portion of the
voice coil 2 is suspended by the damper 4 in the magnetic circuit 3. The end of the diaphragm 1
is connected to the frame 6 by an edge 5. The edge 5 has a structure in which the length can be
expanded and contracted in the circumferential direction with respect to the vibration of the
diaphragm 1 so that the movement of the diaphragm 1 can be smoothly moved. That is, the small
pieces 5-1 and 5-2 having a substantially V-shaped cross section extend from below the
diaphragm 1 and the frame 6 to the lower side of the diaphragm 1.
The small pieces 5-1 to 5-2 are continuously connected in the circumferential direction to form a
concave and convex shape and the wall surface is continuously formed 0 The other end 5-1-a of
this small piece 6-1, 5-1 A small piece 5-3 having a V-shaped cross section extends in a direction
parallel to the diaphragm 1 in b. Similarly, on the frame θ side, a small piece 5-4 having a Vshaped cross section extends in a direction parallel to the diaphragm 1 at the other end 5-2-a and
5-2-b of the small piece 5-2. The small pieces 5-3 and 5-4 are connected to each other by a fivevein-b, so that the respective wall surfaces are continuously formed in a concavo-convex shape in
the circumferential direction. The movement of the edge constructed in this way will now be
described. FIG. 6 is a model of the component part of wall piece 5-3, 5-4 which connects each
wall piece 5-1.5-2. FIG. 6 is a top view thereof, and FIG. 7 is a plan view. Now, when a force is
applied in the direction of the solid line arrow and is shrunk in that direction, sides 5-3-c, 5-4-0
and 5-3-d, 5-4-ci and 6-3-e, 5 At the same time as -4-e moves in the direction of the broken
arrow, the sides 5-3-a and 5-3-b move upward so that the corners 110-11-12 become smaller.
For this reason, the angle θ1 of the surfaces 7-8-11-10 and 8-9-12-11 and the surfaces 1O-1114-j3 and 11-12-15-14 also move to be smaller. Analyze the movement of the element in FIGS. 8
and 9. Take the coordinates as shown in the figure and place a positive area in the direction
marked O. We set 0 as a fixed point for convenience. Suppose now that point B approaches point
B 'and point F approaches point F' by 1 each in the Y-axis direction. Then, the coordinates of B'F
'are moved to B' (2 DEG 8,8,1 DEG 6 Beno 0) and F '(2,8, -1,0) respectively. Parallelogram ABCD,
which constitutes this element! : The size of CDEF, side length, diagonal length, and angle itself
do not change unless the surface is deformed. Now suppose that point D did not move in the
above condition. The diagonal length BD is 2 ° 45, B / D is 2.28, and BD to B′D ′ ′ ′ C.
Therefore, it is contradictory that the parallelogram must be deformed. Where will the point D
come? It is obvious that the two parallelograms are symmetrical about the X axis and therefore
move on the X axis. Assuming that the coordinates after movement are D / (X, Y, Z), Y = o (1)
while BD, = (BD ') (2-'X) "+ (2-Y)" + Z ′ ′ = W− · − @) and further CD = c D ′ becomes 1.322).
From this point A, the motion <A 'point becomes (3, 3 1, 1.322) and F' point becomes (3, 3, -1, 1,
322). This element shrinks by 0.5 in the X-axis direction (corresponding to the circumferential
direction at the edge) when it is contracted by 1 in the Y-axis direction. That is, it has been
proved that the element of FIG. 5 is a female element which can expand and contract in the
circumferential direction by rotation of the parallelogram surface. The rate of deformation
between the X-axis and the Y-axis can be appropriately recognized by appropriately selecting the
dimensional relationship of each side. That is, when a force in the direction of the arrow is
applied to the piece shown in FIG. 6, the piece shrinks in the direction of the solid arrow and at
the same time shrinks in the direction of the dotted arrow. In the opposite case, it moves in the
reverse direction of the dotted arrow in the opposite direction, and moves between points 7-9
and between points 13-15. Thus, the element of FIG. 6 moves in the direction in which the force
is applied and at the same time expands and contracts in the direction perpendicular to the force.
Next, how this element works when configured as an edge will be described. FIG. 10 shows this
movement in a simplified manner. In the steady state, it is in the position of the solid line, and it
is a dotted line when it moves upward, and it is a dashed line when it moves downward. 16 is the
element described above. First consider the case where it moved to "2". At the center of 16, the
distance from the center of the diaphragm changes from r to r 2 and is in a relationship of r 2 (r).
Considering element 16, the initial length π r should be reduced to π r 2. Conversely, if you
move downward, it changes from 161dr to rl and it has a relation r (rl. Similarly at 16 the length
must extend from πr to πr1. That is, as the 16 elements move upward, they must extend when
moving downward. As described above, in the edge of this example in which the elements of FIG.
6 are arranged in the circumferential direction, the elements can be expanded and contracted in
the circumferential direction, and this condition is sufficiently satisfied. FIG. 11 shows another
embodiment of the present invention, and is a cross-sectional view of the wall autumn connected
to the element of the small piece 5-3.5-4 and the frame 6 and the diaphragm 1 at the edge of FIG.
Is formed by continuously forming concave and convex shapes in the circumferential direction
with small pieces 5-5.5-6 having a trapezoidal shape, and exerts the same function. In the above
embodiment, the small wall pieces 5-1, 6-2.5-5 and 5-6 are described as being bent downward of
the diaphragm 1, but the same is true even if they are bent upward. It is needless to say that the
effects are exhibited. As described above, in the speaker edge of the present invention, the edge
expands and contracts in the circumferential direction with respect to the movement of the
diaphragm, and does not disturb the movement of the diaphragm.
Therefore, the distortion of the support system due to the edge is small, and a speaker capable of
high fidelity reproduction can be realized. In addition, if the swing range is larger than that of the
roll edge of the same width, a speaker capable of a large swing can be realized, and if it is used
for bass, rich bass can be reproduced.
Brief description of the drawings
1 is a cross-sectional view of a conventional speaker, FIG. 2 is an explanatory view of the
operation of the main part of the same speaker, FIG. 3 is a cross-sectional view of a speaker using
a speaker edge of the present invention, and FIG. Fig. 5 is a perspective view of the essential 10page portion of the same speaker edge, Fig. 6 is a top view thereof, Fig. 7 is a plan view thereof,
Fig. 8, 9 and 10 is an explanation of the operation of the same speaker edge FIG. 11 shows
another embodiment of the speaker edge according to the present invention, where a is a plan
view of the main part and b is a cross-sectional view taken along the line −-0 ′.
5 ...... edge, 5-1, 6-2, 5-5, 5-6 ...... pieces, 5-3.5-4 ...... pieces. Name of Agent Attorney Nakao Toshio
and 1 other person 1 Figure 21 Figure 5 6-2-a 5-2-fA 6th factor Figure 7 Figure 10 b Figure "Y"
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