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1--) Specification 1, title of the invention
-Electrodynamic speaker
3. Detailed description of the invention The present invention has appropriate compliance with
axial force of the voice coil bobbin, good linearity even at large amplitude, and further, the
direction perpendicular to the axis of the voice coil bobbin. It is an object of the present invention
to provide an electrodynamic speaker equipped with a damper having a sufficient regulatory
force against the force. Fig. 1 shows a conventional 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 inward
facing surface and the center pole 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
bobbin coil 8 is wound around the coil bobbin 7. Reference numeral 9 denotes a cloth
impregnated with a resin, which is a heat-formed corrugated damper. The inset portion of the
damper 9 is fixed to the coil bobbin 7 and the outer peripheral portion is fixed to the frame 5. 10
is a dust cap attached to the diaphragm 6. In the above-described conventional electrodynamic
speaker, the motion of the coil povin 7 in the direction orthogonal to the axis thereof is restricted
by the damper 9, and the coil is moved in the axial direction EndPage: 13 -'- D. The conditions
required for the damper 9 for holding the coil bobbin 7 include: (a) having a compliance that is
universal in the axial direction of the coil bobbin and having good linearity even at a large
amplitude, (a diameter of the bl coil bobbin Having sufficient stiffness for the direction, etc.
However, the corrugated damper 9 in the above-described conventional example has a
sufficiently high radial stiffness of the damper 9 in order to satisfy the condition of the above-
mentioned fbl. Therefore, the above condition (al is not satisfied, and as shown by A in FIG. 2,
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 5 show a damper 11 used in an embodiment of the present
invention. The damper 11 is configured by bonding the necessary side N 'of the two damper
plates 12.13.
Each damper plate 12.13 has the same shape, and is bent at the outer periphery of each of the
rectangular central support portions 15a and 15b formed with the holes 14a and 14b into which
the coil bobbins are inserted and fixed, and the central support portions 15a and 15b. The four
damper pieces 1a, 17b connected via the portions 16a, 16bi. 17c, 17d, 18a, 18b, 18c, 18d, each
damper piece 17a to 17d, (peripheral support portions 20a, 20b connected to the outer
periphery of 8a to 18b via bent portions 1a, a, 19bi, The central support portions 15a and 15b1
and the outer peripheral support portions 20 & and 20b of the two damper plates 12.13 are
attached to each other. Each of the damper pieces 1a to 17d and 18a to 18d is the bent portion
16a. 16b and two plane elements 22 ? ? connected via bending sections 21a, 21bi parallel to
the bending sections 19a, 19b, 22b, 22b, 23b, etc., 6 / ?1, each plane element 22a, 22b 123a ,
23b are provided with reinforcing ribs to increase the rigidity of the surface. The damper pieces
17a to 17d consisting of the surface elements 22 & 22b are bent upward to be convex, and the
damper pieces 18a to 18d consisting of the surface elements 23 & 23b are bent downward to
form a convex As shown also in FIG. 4, when viewed from the side of the surface elements 22a,
22b 123a, 2abi, it becomes a quadrilateral. Reference numeral 24 denotes a dustproof net in
which the inner cylinder is held by the central support portions 16a and 16b and the outer
circumference is held by the outer peripheral support portions 20a and 20b. FIG. 6 shows the
operation of the above-mentioned embodiment, in which the solid line shows the stationary state
and the broken line shows the state displaced upward. Surface elements 22a, 22b, 23a. When the
coil bobbin fixed to the central support portion is displaced upward by a rectangular shape a, b,
c, d by 23b, the point C is displaced to the point C in the direction of the axis 2 of the coil bobbin,
and the quadrilateral a, b, c , D is transformed to quadrilateral ab /, CI, d /. The point C is
displaced in the direction of axis 2 and not in the direction orthogonal to the axis ?. This is
because the damper pieces 17b and 18b adjacent to the damper pieces 17a and 18a are
restricted by the damper pieces 17b and 17a and 18d. 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 above embodiment, four sets of four extensible square
cylinders made of surface elements are provided, but it is sufficient to throw the 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.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of the main part of a
conventional electrodynamic speaker, and FIG. 2 is a damper of the conventional electrodynamic
speaker and EndPage: 271 media according to an embodiment of the present invention. Fig. 3 is
a top view of a damper of an electrodynamic-type speaker according to an embodiment of the
present invention, Fig. 4 is a view taken in the direction of arrows A- 0-B in Fig. 3, Fig. 6 Is a
perspective view of the same six-piece cylinder, and a figure 6 is an operation explanatory
diagram of the same damper. 7
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии , 16b---central support portion, 16a, 16b... 19b ииииии Bending section, 20a, 20b иииии Body supporting
section, 21a, 21b и = ? и bending section, 22a, 22b. 23a, 23b----Area element, 24-Net for dust
prevention. Name of agent Attorney Nakao et al. 1 person Fig.2 Fig.3 Fig.5 Fig.6 10EndPage: ?
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description, jps5733896
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