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JPS6062797

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DESCRIPTION JPS6062797
[0001]
The present invention has an adequate compliance with the axial force of the voice coil bobbin,
has good linearity even to 2 peno when large amplitude, and is sufficient for the force in the
direction perpendicular to the voice coil bobbin axis. An electrodynamic speaker provided with a
damper which has a regulating force and further improves the rolling strength of the vibration
system of the speaker. FIG. 1 shows a conventional ordinary electrodynamic speaker. In FIG. 1, 1
is a yoke integrally formed with the center pole 2, 3 is an annular magnet fixed on the yoke 1, 4
is an annular plate fixed on the magnet 3, and An annular magnetic gap is formed between the
inner circumferential surface and the center ball 2. Reference numeral 6 denotes a frame fixed
on the plate 4 and 6 denotes a diaphragm. The outer peripheral portion of the diaphragm 6 is
supported by the frame 6 via an edge member (not shown). A coil bobbin 7 is fixed to the
diaphragm 6, and a voice coil 8 is wound around the coil bobbin 7. A corrugated damper 9 is
formed 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 diaphragm 6. In the above-described conventional dynamic
speaker, the damper 9 restricts the movement of the coil bobbin 7 in the direction orthogonal to
the axis thereof, and moves in the axial direction. The conditions required for the damper 9 for
holding the coil bobbin end are: (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
sufficient stiffness for the direction, etc. However, since the waveform damper 9 in the abovementioned conventional example has a sufficiently high rigidity in the radial direction of the
damper 9 so as to satisfy the condition (b), the condition (IL) is not satisfied. As shown in FIG. 1,
there is a drawback that the car displacement characteristic of the damper 9 becomes non-linear
at large amplitude. Therefore, in the conventional loudspeaker, harmonic distortion occurs in the
low frequency range. However, there has been proposed an electrodynamic speaker equipped
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1
with a damper which can eliminate the above-mentioned conventional drawbacks. Next, the
damper of this electrodynamic speaker will be described with reference to FIGS. 3 to 6 show the
damper 11 in the above-mentioned dynamic loudspeaker. The damper 11 is configured by
bonding necessary portions of two damper plates 12.13.
Each of the damper plates 12.13 has the same shape, and has a rectangular central support 15
&, 15b formed with holes 144, 14b into which the coil bobbins are inserted and fixed, and the
central support 151L. Four damper pieces 17L, 17b connected to the outer periphery of 15b via
bent portions 16a, 16b. 170.17d, 18a, 18b, 180, 18d, each including one outer support portion
201L, 20b connected to the outer periphery of each damper piece 17a to 17d 118a to 18d via
the bending portions 19a, 19b, and two damper plates 12 .13 central support portions 151L and
6 Beno 15b, and outer peripheral support portions 201L and 20b are respectively bonded. Each
said damper piece 17a-17d118a-18d is the said bending part 16a. 16b and two folds 211L, 21b
connected in parallel to the folds 19a, 19b via two folds 212L, 22b, 23 &, 23b, each of the folds
22a, 22b, 23 &, 23b In order to increase the rigidity of the surface, reinforcing ribs are formed.
The damper pieces 17a to 17d consisting of the face elements 221L and 22b are bent upward to
be convex, and the damper pieces 181L to 18d consisting of the plane elements 231L and 23b
are bent downward to form a convex As also shown in FIG. 4, the surface elements 22a, 22b, 23
&, 23b are quadrilateral when viewed from the side. A dustproof net 24 has its inner periphery
held by the central support portions 161L and 16b and its outer circumference held by the outer
peripheral support portions 20 & and 20b. FIG. 6 shows the operation of the damper, in which
the solid line shows the state of rest and the broken line shows the state of being displaced
upward. Elements 22 & 22b, 23a. A quadrilateral a, b, c, d is constituted by 6 pages 23b, and
when the coil bobbin fixed to the central support portion is displaced upward, the point C is
displaced to a point C in the direction of the axis l of the coil bobbin. , C, d are transformed into
quadrilateral II. ???????????? The point C is displaced in the direction of the axis l
and not in the direction perpendicular to the axis l, the damper pieces 17 &, 18 & and the
damper piece 17b adjacent to both sides. 18b and 17 (to be regulated by 1, 186). Thus,
according to the dampers shown in FIGS. 3 to 6, as shown by B in FIG. 2, the damper vibrates
with high linearity even at large amplitude. Although two damper plates of the same shape are
attached to each other in the above-mentioned damper, the central support portion and the outer
peripheral support portion of one of the damper plates may be removed.
In the above-described damper, although four sets of four extensible square cylinders made of
four elements are provided, the strength of the regular polygon is not sufficiently improved. The
reason will be described below together with FIGS. 7a and 7b. FIGS. 7a and 7b show the vicinity
of the bent portions 19a and 191) between the surface elements 22b and 23b and the outer
peripheral support portions 2C1 & 20b of the dampers shown in FIGS. As shown in FIGS. 7a and
7b, in the conventional example, flat portions 26a and 26b are formed between the end portions
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of the reinforcing ribs 25a and 25b formed on the surface element 22b and the bent portions
19a and 19b. Because there is this flat portion 26a. 26b was bent, and the rolling strength was
improved. The inventor extended the ends of the reinforcing ribs 25a, 25b to the bent portions
19a, 19b and removed the flat portions 26a, 26b shown in FIGS. 7a, b, as shown in FIGS. The
damper was manufactured on a trial basis, but in this case there was a defect that the linearity
became worse. Further, the inventor made a prototype of a damper in which curved corrugations
27a and 27b were formed on flat portions as shown in FIGS. 9a and 9b. In this case, the flat
members 22b and 23b were operated during operation of the damper. The forces along the
surface acted to deform the corrugations 27a and 27b, and the rolling strength did not improve.
The present invention eliminates the above-mentioned conventional drawbacks and improves the
linearity and rolling strength. An embodiment of the present invention will be described below
with reference to FIGS. 10a and 10b. In FIGS. 10a and 10b, 282L and 28b are curved
corrugations formed in the direction along the bent portions 19 &, 19b at the end portions of the
surface elements 22b and 23b on the side of the bent portions 19a and 19b, 29 &, 291) are
reinforcing ribs having a triangular cross-section formed on the surface elements 22b and 23b,
and the reinforcing ribs 29a and 29b are three parallel turns, and the directions of M and H are
bending portions 19a. The reinforcing ribs 291L, 29b have one end perpendicular to the
corrugation 28a. It is connected to the curved surface of 28b. Such reinforcing ribs 29 & are
different from those of the surface elements 22b and 23b. In the above embodiment, the
corrugation 281L is provided only on the side of the bent portions 19a and 19b of the surface
elements 22b and 23b. Although 28b is formed, the same corrugation may be formed only on the
side of the bent portions 16a and 16b of the surface elements 22a and 23a, or may be formed on
both sides.
The present invention is configured as described above, and the rigidity of the surface element is
increased and the flexible hinge is formed without rattling, so the linearity and rolling strength of
the damper are improved, and in the large amplitude region below fo Distortion is removed to
enable low-range expansion reproduction.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of the main part of a conventional electrodynamic speaker, FIG. 2 is a
car displacement characteristic diagram of a damper of the conventional electrodynamic speaker,
and FIG. 3 is a damper of another electrodynamic speaker of the prior art FIG. 8 is a top view,
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and FIG. 8 is a cross-sectional view and a perspective view of the main part of FIG.
b 1100a, b are a sectional view and a perspective view of the main part of still another damper,
and FIG. 10a, b are a sectional view and a perspective view of the main part of the damper of the
electrodynamic speaker in one embodiment of the present invention. . 7
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Hole , 15a,
15b иии и и и Central support portion, 161L, 16b и и и и и и Bending portion, 171L-17d, 181L-18d и и и и и
и Damper piece, 191L. 19b ...... bent portion, 201.201) ...... periphery supporting member, 21 &,
21 b ,,,,,, bent portion, 221L, 22b. 231L, 23b ииииии surface elements, 28a, 28b ииииии corrugation,
291L, 29b ииииии reinforcement descriptor, L. M, N ..... ?. Name of agent Attorney Nakao Toshio
One other person ? \ Tsuka 90 C ? l Fig. 10 (a) 29 K 6 a (1)) N 29 ?! ?????????
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