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JPS5986996

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DESCRIPTION JPS5986996
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic loudspeaker having an elliptical or rectangular diaphragm with a uniaxial narrow
configuration. The structure of the conventional example and its problems In general, an
electrodynamic speaker having an elliptical or rectangular diaphragm is an annular ring at the
center of a field portion in which a top plate and a bottom plate are fixed up and down with a
ring-shaped magnet) k. And a voice coil bobbin in which a voice coil is wound in the magnetic
gap is suspended between the frame fixed to the top plate constituting the above-mentioned field
section through a corrugated sheet and a rib. The voice coil bobbin is configured to be supported
on the frame via the entire outer edge portion of the oval or rectangular diaphragm in which the
inner circumferential portion is fixed. However, in the case of the dynamic type speaker
described above, since the outer diameter of the damper is limited to the short diameter of the
elliptical or rectangular speaker, a thick sana damper can not be adopted, thereby narrowing the
width of the waveform portion of the damper and large amplitude There is a problem that high
fidelity deep bass reproduction can not be easily performed because the displacement of the
diaphragm can be made to follow the displacement of the diaphragm with respect to the driving
force to the region with good linearity. As a method for solving the above-mentioned problems, a
damper having a rectangular cylinder having a rectangular cross section is formed around the
central support of a polygon, and the rectangular cylinder is provided in the minor axis direction
of an elliptical or rectangular speaker. Attempts have been made to narrow the width and
increase the height of the square cylinder or to improve it with an anisotropic material to
deteriorate the linearity, but the length in the minor axis direction includes the outer peripheral
support Since it does not become so short, it is difficult to make the displacement of the
diaphragm follow the linearity well. SUMMARY OF THE INVENTION An object of the present
invention is to provide a speaker that has a large insertion point in the frame in the long axis
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direction and a narrow space in the short axis direction, such as an elliptical speaker or a
rectangular speaker. To provide all electrodynamic type loudspeakers that enable deep bass
reproduction. The electrodynamic loudspeaker according to the present invention comprises an
even polygon central support portion on which a voice coil bobbin suspended by a voice coil
bobbin provided on an inner peripheral portion of an elliptical or rectangular diaphragm and in
which a voice coil bobbin is inserted and fixed; It consists of a rectangular cylinder having a
bendable cross-sectional rectangular cross-section connected to the outer periphery of the
central support portion via a bending portion, and an outer peripheral support portion connected
to the outer periphery of the square cylindrical body via a bending portion. The rectangular
cylindrical body and the outer peripheral support portion are disposed within the width of the
central support portion in the short diameter direction. According to this configuration, the
square cylinder having strength against twisting is disposed adjacent to the outer periphery of
the polygonal central support such as rhombus to prevent tilting of the central support, and
Amplitude linearity can be improved by shape change.
And the above-mentioned square tube is a short diameter of an electrodynamic speaker. A
damper having a polygonal central support such as a rhombus or the like adapted to the major
axis improves the amplitude linearity in an elliptical or rectangular electrodynamic speaker and
achieves high fidelity reproduction including deep bass It can be totally realized. DESCRIPTION
OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an embodiment of the present invention,
in which a field section comprises a ring-shaped magnet 3 fixed on a bottom plate 2 and a ringshaped magnet 3 on the bottom plate 2. The top plate 4 is fixed and has an annular magnetic air
gap 5 in the middle fire. The voice coil 7 is wound around the voice coil bobbin 6 in the magnetic
gap 5 and suspended by the damper 8. On the other hand, the outer peripheral portion of the
damper 8 is attached to the frame 9 fixed to the plate 4. The inner diameter side of the
diaphragm 1 is adhered to the voice coil bobbin 6 and the outer diameter side is adhered to the
upper end of the frame 9 via an edge 10 provided around the diaphragm. Here, the damper 8 is
made of a material such as a wire cloth impregnated with a thermoplastic resin as shown in FIG.
2 and FIG. The damper 8 has a polygonal central support 12 on the inner diameter side with a
hole 11i for insertion and fixation of the voice coil bobbin. The outer periphery of the central
support 12 (13-2L. 13-b, 13-C, 13- + 1) A rectangular cylinder (14-2L, 14-b) having a rectangular
cross section through a bending portion (in this embodiment, the outer periphery acts as a
bending portion) . 14-C. 14-d) is an adjacent sharing point (AB). BC, C'D, DA) i are arranged. The
square cylindrical bodies 14-2L, 14-b, 14-Ci, 14-d are end faces (16-a) that are inclined so as to
be disposed inside the diagonal length W (7) width of the central support portion 12 , 16-b, 16-c,
16-d) f. The outer peripheral support portion (17-a, 17-b) is a bent portion (15-a, 15-b, 15-C, 15-)
into the above-mentioned square cylindrical body 14-J 14-b, 14-c, 14-d. d) are linked via In order
to realize all of these configurations, the above-mentioned material is formed on the upper side
and the lower side and is bonded. The outer peripheral support portions 17- & 17- are fixed to
the frame. The operation of the elliptical or rectangular electrodynamic loudspeaker of this
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embodiment configured as described above will be described below. When a driving force in the
vibration axis direction is generated in the voice coil, rectangular cylinders 14-a, 14-b, 14-0. The
central support 12 is displaced in the vibration axis direction by being deformed into a 14-d
diamond cross section.
Also, when a driving force inclined to the vibration axis acts on the voice coil 7, the damper 8
shows a reaction force against it, and the voice coil hits the wall surface of the magnetic gap 6 of
the field part to generate all abnormal sound. You must not do it. FIG. 4 shows a perspective view
of the damper, and when the rotational force as shown by the arrow F in FIG. 4 acts, the
following rotational force is generated around the outer periphery of the central support 12. That
is, the outer periphery 13- & is negative at the sharing point DA, the rotational force in the
positive direction at AB, positive at the sharing point AB of the outer periphery 13-b, negative at
Be, and positive at the sharing point BO of the outer periphery 13-C. , Negative at CD, negative at
shared point OA of outer periphery 13-d, and positive rotational force at DA. At the common
point Be, positive and negative rotational forces act, but they are canceled because the square
cylinders 14-a to 14-d are disposed adjacent to each other. The same applies to the DA point.
Since rotational force in the same direction acts on points AB and CD, eventually, positive
rotational force on AB and negative rotational force on CD are applied to the center support
portion 12. Square cylinders yAB, Be, CD having torsional 9 strength against these rotational
forces. The rotational force can be prevented by arranging the DA in a form having a common
point. End 16-2L of the square cylinder. Even if 16-b, 16-C, 16-d have the above common points,
even if they are cut diagonally so as to be placed within the diagonal length W of the central
support portion, the torsion 9 strength of the square cylinder is almost the same Acts effectively.
Therefore, according to the present embodiment, the square cylindrical body is adjacent to and
connected to the central support portion so as to hold the common point metal, and the
rectangular cylindrical body and the outer peripheral support portion are disposed within the
width of the diagonal length. Ellipse formation is a damper with excellent amplitude linearity
even in the case of an electrodynamic speaker where the arrangement location of the damper is
narrow in the minor axis direction like a rectangle, and high fidelity and powerful heavy bass
reproduction is possible. Become. FIG. 6 is a plan view of a rectangular-shaped electrodynamic
speaker damper according to a second embodiment of the present invention, and FIG. 6 is a side
elevational view thereof. In the figure, the same components as those in FIG. 3 have the same
reference numerals. What is different from FIG. 3 is that when the width W ? in the minor axis
direction is further narrow, the square cylinder has the common points AB and CD in the major
axis direction but has the common point in the minor axis direction. It is separated from A, B, C,
D. Therefore, when a rotational force Fi as shown in FIG. 4 is applied, the central support 12
bends at the center line e1 in the minor axis direction in order to generate reverse rotational
forces in A and D and B and C. As a result, the voice coil tilts and an abnormal sound is
generated.
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Therefore, reinforcement ribs 1 B-2L, 18-bi for transmitting the rotational force between B and C
and A and 0 are provided, and the curve at the center line 11 prevents 9 and linearity to the
large amplitude region We have achieved a good damper. According to the present embodiment,
it is effective when the damper bonding margin portion in the short diameter direction is further
narrow. Effects of the Invention As described above, according to the present invention, a
rectangular cylinder having a bendable and extensible rectangular cross section is disposed on
the outer periphery of a central support portion to which a voice coil is inserted and fixed, and
the rectangular cylinder is central Since a damper is provided which is obliquely removed so as
to be disposed within the width of the diagonal length of the support portion and further
provided with an outer peripheral support portion at the outer periphery of the cylindrical
portion of the square cylinder, There is room in the space, but it is possible to make it follow an
ellipse with a narrow width direction in the minor axis direction or to make the rectangular
electrodynamic speaker gold large amplitude area 1 follow with good linearity, and to prevent
the rotational force acting on the voice coil can do. Therefore, the excellent ellipse formation that
enables high fidelity and truly powerful deep bass reproduction has the advantage of realizing a
rectangular electrodynamic speaker.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half side view showing an example of an electrodynamic loudspeaker according to the
present invention, FIG. 2 is a plan view of a dunno of the loudspeaker, and FIG. 3 is a sectional
view taken along the line A-B-0-C. Fig. 4 is a perspective view of the same damper, Fig. 5 is a plan
view showing another embodiment of the same damper, and Fig. 6 is a sectional view taken along
the line A-B-0-1.
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insertion hole, 12-- central support portion, 13-a, 13-b, 13-c, 13-d ииииии outer periphery of the
central support portion, 14-a, 14 -b, 14-C, 14-d-, и, rectangular tubular body, the outer periphery
of the 15-J 15-b, 15-C, 15-d ииииии rectangular tubular body 16-a, 16 -B, 16-c. 16-d
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ии Reinforcing rib, end part of the square cylinder, 17-a, 17-b иииииииииииииии
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