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The present invention has appropriate compliance with the axial force of the voice coil bobbin,
has good linearity even at large amplitude, and has sufficient restriction force against the force in
the direction perpendicular to the axis of the voice coil bobbin. The present invention provides an
electrodynamic speaker equipped with a damper having the following features: FIG. 1 shows a
conventional electrodynamic speaker. In FIG. 1, 1 is a center pole 2 integrally formed / -yoke, 3 is
a J'jit-like magnet fixed on the yoke 1, 4 is an annular shape fixed on the magnet 3 It is a plate,
and an annular magnetic gap is formed between the inner periphery of the plate 4 and the it self
self center pole 2 06 is fixed on the plate 4 / this 11.6 is a diaphragm, The outer peripheral
portion of the diaphragm 6 is supported by the frame weir via an edge member (not shown). A
coil bobbin 7 has a force of 1 δl fixed on the diaphragm 6, and a voice coil 8 is wound around
the coil bobbin 7. Numeral 9 is a corrugated damper obtained by impregnating a cloth with a
resin and heat-forming it. The inner peripheral portion of the damper 9 is fixed to the coil bobbin
7 and the outer peripheral portion is fixed to the frame 6. 10 is a dust cap attached to the return
plate 6. j: In the conventional electrodynamic speaker, the coil bobbin 7 is restricted in movement
in the direction orthogonal to its axis by the damper 9 and moves in the axial direction. The
conditions required for the damper 9 for holding the coil bobbin 7 include: (a) having adequate
compliance in the axial direction of the coil bobbin and having good linearity even at large
amplitudes; (b) diameter of the coil bobbin Having enough stiffness for the direction, etc.
However, since the waveform damper 9 in the above-mentioned conventional example has a
sufficiently high rigidity in the radial direction of the damper 9 in order to satisfy the condition
(b), the condition of the above-mentioned body is not satisfied. As indicated by A, there is a defect
that the car displacement characteristic of the damper 9 becomes non-linear at the time of large
amplitude. Therefore, in the conventional loudspeaker, harmonic distortion occurs in the low
frequency range. The present invention eliminates the above-mentioned conventional drawbacks,
and an embodiment of the present invention will be described below with reference to FIGS. 3 to
6 show a damper 1B 'according to an embodiment of the present invention (the damper 11
shown in the figure is attached to the necessary portions of the two damper plates 12.13 and
fixed to the outer peripheral support ring Is configured.
Each damper plate 12.13 has the same shape, and has rectangular central support portions 15a
and 15b formed with holes 14a and 14b into which the coil bobbins are inserted and fixed,
respectively, and the outer peripheries of the central support portions 15a and 15b. The four
damper pieces 1a + 17b y'7C + 1'7d, 18a ', 18b, 18C, 18d, and the respective damper pieces 17a17a, 18a-1sct connected via the bent portions 16a, 161). A central portion 15a and 15b1 and a
mounting portion 20a and 20b, which are composed of a pair of portions 20a and 20b
connected to the outer periphery via a bending portion 19a and 19b. Of the damper pieces 17a
to 17d 118a to 18d are the bent portions 16a and 16b and the bent portions 19a and 19b,
respectively. Parallel to the bent portion 21a. 21 b Two elements 22a supplied via liCλiV. Each
of the surface elements 22a, 22b, 23a, 23b is formed with a reinforcing rib having a surface
rigidity of 1 and a radius of curvature. The damper pieces 17a to 17d, which are composed of the
face elements 22a and 22b, are bent so as to be upwardly convex, and the face elements 23a.
The damper pieces 18a to 18d consisting of 23b are bent downward to be convex, and as shown
in FIG. 4, the simple 22a, 22b, 23a and 23b are quadrilateral when viewed from the side, and this
quadrilateral is The central support portions 15a and 15b are subjected to a contracting force
that contracts in the direction. Reference numerals 24a and 24b denote holes formed in the
attachment portions 20a and 20b. Reference numeral 26 denotes an outer peripheral support
ring, and a hole 26 is formed in the outer peripheral support ring 26. A damper is formed by
bonding the mounting portions 20a and 20b of the outer peripheral portions of the damper
plates 12 and 13 to the upper surface of the outer peripheral support ring 25. FIG. 6 shows a
method and jig for bonding the mounting portions 2Qa and 20b to the outer peripheral support
ring 25. Reference numeral 27 denotes a flat jig, and a pin 28 is implanted on the upper surface
of the jig 27. In FIG. 6, application (': 41'i;) If 61129 of the upper surface of the outer peripheral
support ring 26 is applied, and the formation 26 of the outer peripheral support ring 26 is
inserted into the pin 28 of the jig 27. Next, the mounting portion 20a of the damper plate 12.13.
20b is pulled outward with a tensile force (f), and in a state where the square cylindrical damper
cylinder in a contracted state is extended, the holes 24. 24b of the attachment portions 20a, 20b
are inserted into the pins 28 of the jig 27 The parts 2Qa and 20b are bonded to the outer surface
of the outer circumferential support / gug 25 and completed.
It is a dustproof net held between the 30t damper plate 12.13. FIG. 7C shows the operation of
the pigeon ML embodiment, the solid line r1 rest state, and the broken line shows the state
displaced upward, 1 simple 22a, 22b, 23a. When a coil bobbin fixed to the central support
portion is displaced upward by 23b, quadrilaterals a, l), c, d are constructed, point C displaces the
axis of the coil bobbin to miscellaneous C 'in the direction, and quadrilateral a, l), c, d are
transformed into quadrilaterals a, b ', c', d '. The point C displaces in the direction of the axis and
does not displace in the direction directly in contact with the wedge t because it is restricted by
the damper pieces 171), 18b and 17d, 18d adjacent to the damper pieces 17a, 18a. is there.
According to the damper of this embodiment, as shown by B in FIG. 2, the damper vibrates with
high linearity even at a large amplitude. Although two damper plates of the same shape are
attached to each other in the above embodiment, the central support portion and the outer
peripheral support portion of one damper plate may be removed. In the embodiment described
above, four silk-shaped flexible and extensible square cylinders made of four elements are
provided, but it is sufficient to provide square cylinders around the outer periphery of the central
support portion of a regular polygon. The present invention is configured as described above,
and according to the present invention, the coil bobbin can be displaced only in the axial
direction, and can be vibrated with high linearity even at large amplitude, and low in the large
amplitude region. It has the advantage that the region distortion can be reduced. Further,
according to the present invention, since the square cylindrical damper cylinder is pulled
outward against the force to be contracted to the center and fixed to the outer peripheral support
ring, the stationary position is stabilized. That is, according to the space between homes, the
position of the zero point in the stationary state in FIG. 7 is always fixed.
Brief description of the drawings
Fig. 1 is a cross-sectional view of the main part of a conventional electrodynamic loudspeaker,
Fig. 2C 11 ° shows a damper of a conventional electrodynamic loudspeaker and the car
displacement characteristic diagram of the damper in one embodiment of Fig. 3 is Fig. 3 FIG. 4 is
a top view of a damper of an electrodynamic speaker according to an embodiment of the present
invention, FIG. 4 is an A'O-B arrow celebration view of FIG. 3, FIG. 6 is a perspective view of the
damper, and FIG. FIG. 7 is an explanatory view of the operation of the damper.
7 ······· 1 · 1 · bobbin · 8 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1 · · · · · · ·
· · · · · · · · · · · · · damper plate Central support, 16a, 161)-= bent, 17 ° a-17d, 18a-18d-=-damper
piece, 19a. 19 b--Fold FIS, 20 a, 20 b----Mounting part, 21a, 21 b----Folding part, 22 a + 22 b + 23
a, 23 b--element, 24 a , 24b-= holes, 25 .....-outer peripheral support ring, 26 ..... holes ... 27 ..... ...
Dustproof net. Name of Agent Attorney Nakao Toshio and 1 other person Figure 1 Figure 2 7133
Figure S '+ 4 Figure 5-Figure 6