DESCRIPTION JPS57128294

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DESCRIPTION JPS57128294
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a
vibration system structure according to the prior art, FIG. 2 is a longitudinal sectional view at the
time of assembly, and FIG. 3 is a vibration system structure and diaphragm according to the
present invention. 4 is a longitudinal sectional view at the time of assembly, FIG. 4B is a
perspective view of the vibration system structure, and FIG. The mouth and c show the molding
process explanatory view of the other embodiment. 1 ... bobbin, 2 ... damper, 3 ... diaphragm, 4 ...
voice coil.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration system
structure of a speaker comprising a bobbin for voice coil and a damper for holding the bobbin.
FIG. 1 is an exploded perspective view showing a vibration system structure in a conventional
dome speaker, and FIG. 2 is a longitudinal sectional view in the same assembly, but as shown in
FIG. The voice coil A is formed separately from the fully wound bobbin B and the damper C, and
at the time of assembly, the damper Ct is fixed to the bobbin B with an adhesive, and then the
Dahayafram D is fixed to the upper opening of the bobbin B It has the following disadvantages:
The number of assembly steps is large and the rate is non-functional. Since the damper Ct-fixed
to the bobbin B (1 ring / 1 minute 10 pairs 3. ) 猥 Assembly accuracy is busy. Since an adhesive
is used to fix the bobbin B and the damper C, the sensitivity is lowered due to the weight of the
nuclear adhesive, and the characteristics are likely to be uneven due to the variation in the
application of the adhesive. When the diaphragm type diaphragm is attached to the upper
opening of the bobbin B, since the bonding area is small, defects such as peeling easily occur.
Therefore, the present invention is intended to provide a speaker vibration system structure in
which a voice coil bobbin and a damper are integrally formed for the purpose of solving the
above-mentioned drawbacks. The present invention will now be described by way of an
embodiment shown in the drawings. FIG. 3 is a perspective view of a vibration system structure
and a diaphragm type diaphragm according to the present invention, and FIG. 4 is a longitudinal
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sectional view at the time of assembly. In the above drawings, l is a bobbin, 2 is a damper for
holding the bobbin 1, and the shape of the damper 2 in the drawing is a butterfly type, but may
be a corrugated core type, and the bobbin 1 and damper described above Although 2 is integrally
formed of a nonmagnetic metal material or heat resistant plastic 12) 036) which has malleability,
its formation process will be described later. A diaphragm 3 has a dome-shaped diaphragm in the
drawing but may have a cone shape. Then, in assembly, first, the bobbin 1 is wound to form the
voice coil 4 gold, and then the diaphragm 3t is adhesively fixed to the upper opening outer
peripheral portion of the bobbin 1 to complete the assembly. In addition, when integrally forming
the bobbin 1 and the damper 2, as shown in the drawing, the upper opening outer peripheral
portion of the bobbin 1 is formed so as to be integrated with the damper 2 and a flange portion
on the outer periphery of the diaphragm 3 If 3a't-formed, the contact area between the flange
portion 3a and the upper outer peripheral portion of the bobbin 1 can be increased. Next, the
step of integrally forming the bobbin 1 and the damper 2 by using a nonmagnetic metal material
by a press molding machine will be described with reference to (a), (b) and (c) of FIG. Do.
In the drawing, 5 is a malleable non-magnetic metal plate, 6 is an upper mold of a press molding
machine, and a cylindrical convex portion 7 forming a bobbin 10 is protruded at the center of the
lower surface of the upper mold 6 And a shear force 7a is formed on the outer periphery of the
lower surface (3) 10 of the projection 7; Further, on the lower surface of the upper die 6, a
shearing force 7b for forming the outer peripheral shape and the linear shape of the damper 2
on the concentric circle of the convex portion 7 is formed. On the other hand, in the lower mold
8, a concave portion 9 into which the convex portion 7 intrudes is formed at a position
corresponding to the convex portion 7. Therefore, as shown in (A) of FIG. 5, after the metal plate
5 is completely mounted on the upper surface of the lower mold 8 and clamped, the upper mold
6 is lowered as shown in (B) of FIG. When protruding into the convex portion 7 ¥ 1-concave
shape 9, the central portion of the metal plate 5 is deep drawn to form the bottomed cylindrical
portion 10, and the bottomed portion 10a is cut by the shear force 7aK to form the bobbin 1 Be
done. On the other hand, the flat portion 11 of the metal plate 5 sandwiched between the upper
mold 6 and the lower mold 8 is cut by the shear force 7 b to form a butterfly-shaped damper 2 1
as shown in FIG. As shown in FIG. 1, an integrated one of the bobbin 1 and the damper 2 is
obtained. In FIG. 6, (a), (b) and (c) show the steps in the case of integrally molding the bobbin 1
and the damper 2 by an impact molding press, and 12 is an upper mold of the same shape as the
bobbin 1 ((6) 4) 10; 3δ) (-, where 13 is a lower mold accurately fitted to the upper mold 12 and
14 is a solid fD of a nonmagnetic metal having malleability. Then, as shown in FIG. 6 (A), after
putting K solid 14 in the recess 13a of the lower mold 13 as shown in (A) of FIG. 6, an upper
mold 12t-high speed, as shown in (B) of FIG. When high pressure is inserted into the recess 13 a
of the lower die 13, the metal mass 14 is pushed out and passes through the gap between the
upper die 12 and the recess 13 m of the lower die 13 so as to move along the outer peripheral
surface of the upper die 12. Ascending, a bottomed cylindrical body 15 which is considerably
higher than the height of the bobbin 1 is formed. Then, the bottomed cylindrical body 15t-the
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bottom portion 15a of the bottomed cylindrical body 15 is removed as shown in (C) of FIG. 6 by
a press molding machine as shown in FIG. The upper half 15bt of the bottom cylindrical body 15
is spread horizontally outward and sheared in a butterfly shape to integrally form the damper 2
and the bobbin 1. When the bobbin 1 and the damper 2 are made of heat-resistant plastic or
plastic, they are of course integrally molded by a resin molding machine. In the present
invention, as shown in the figure, K, the voice coil 4 for the voice coil 4 (5) 10: (:)) 1 and the
damper 2 are integrally molded, so the adhesive application site is small when assembling the
speaker. The total number of assembly steps can be reduced, and the relative positional accuracy
between the bobbin 1 and the damper 2 is improved, and the variation in characteristics is
reduced.
The circle diameter accuracy of the busy bobbin is also improved. In addition, since the bonding
area of the diaphragm 3 can be increased, bonding becomes easy and reliable.
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