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JPS57162599

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DESCRIPTION JPS57162599
Description 1 Title of Invention
Method of manufacturing vibration member for speaker
3. Detailed Description of the Invention The present invention is a speaker vibrating member
having a voice coil of an electrodynamic speaker, a bobbin portion for mounting the voice coil,
and a cone portion for radiating sound into the air. It relates to the manufacturing method of FIG.
1 is a side view of a conventional electrodynamic Sbinica, and FIG. 2 is a partially enlarged view
of FIG. 1 is a permanent magnet 3 stone, 2a is a center pole, 2b is a yoke, 2c is a yoke plate, and
the magnetic circuit 6 is constituted by the permanent magnet 1, center pole 2a, yoke 'lb, and yplate 2c There is. 4 is a diaphragm also referred to as a cone because its shape is conical, 5 is a
damper, 6 is a dust cap attached to the central upper surface of the diaphragm 4, 7 is a gasket, 8
is coupled to the magnetic circuit 6 A frame for connecting the edge 4a of the diaphragm 4
together with the gasket 7 at the peripheral portion 8a, 9 is a voice coil made of metal wire such
as copper, 10 is a bobbin, and the voice coil 9 is wound around the bobbin 10 The intermediate
portion of the bobbin 10 is held by the damper 5, and the voice coil 9 is fitted into the gap 6a of
the magnetic circuit 6 without eccentricity. Reference numeral 11 denotes an adhesive for
bonding the diaphragm 4 most important as a vibration system of the speaker and the bobbin 10
on which the voice coil 9 is mounted, and a central portion of the diaphragm 4 bent along the
peripheral surface of the bobbin 10 EndPage: 15 ° in which the diaphragm 4 and the bobbin 10
are coupled by being interposed between the bent portion 4b and the bobbin 1o In the case
where the diaphragm 4 and the bobbin 10 are coupled as described above, in general, the bobbin
An adhesive 11 is applied in advance to the upper part of 10, and the bobbin 10 is inserted into
the incorporated diaphragm 4 and fixedly adhered. However, since the adhesive 11 is applied in
advance to the upper part of the bobbin 10, a film of the adhesive 11 is formed on the upper part
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of the bobbin 10 after a while, such as when using a quick-drying adhesive. Could not be
completely attached, and there was a poor connection between the two, and it took time for the
work. By applying the adhesive 11 to the bobbin 10 in advance, the adhesive 11 flows downward
and adheres to the damper 5 and the voice coil 9 to cause deterioration of the characteristics as a
speaker. Since the distance between the bent portion 4b of the diaphragm 4 and the bobbin 10 is
small, the adhesive 11 does not penetrate sufficiently and swells on the diaphragm 4, thereby
deteriorating the appearance and adhesion. Moreover, speaking of the voice coil 9, the voice coil
9 must be wound around and attached to the circumferential surface of the bobbin 10, which
requires time and effort and increases the manufacturing cost. It was difficult to wind 10 evenly.
Further, since the voice coil 9 made of metal wire such as copper is wound on the bobbin 10, it is
difficult to achieve the weight reduction required to improve the efficiency of the speaker. It has
the disadvantage of being heavy in weight. Furthermore, when it is incorporated into the
magnetic circuit of the speaker, vibration is generated between the metal wires wound around
the bobbin 10 itself, which has a disadvantage that distortion occurs in the reproduction output.
□ The present invention aims to provide a method of manufacturing a vibration member for a
speaker for removing the above-mentioned drawbacks, integrally molding the diaphragm 4 and
the bobbin 10, and further, forming the voice coil 9 on the bobbin 10. Will be described in detail
with reference to the drawings. FIG. 3 is a side view of an electrodynamic speaker showing one
embodiment of the present invention, and FIG. 4 is a partially enlarged view of FIG. The reference
numerals in FIG. 1 and the reference numerals in FIG. 1 indicate common contents, and the
description thereof will be omitted. Reference numeral 14 denotes a speaker vibration member
constituted of an edge 14a, a bobbin portion 14b for mounting a voice coil, a cone portion 14c
for radiating sound directly into the air, and a voice coil 19. The edge 14a1 bobbin portion 14b
and the cone portion 14c are integrally formed of a resin, for example, an aromatic polyesterbased polyarylate film or the like, and the voice coil 19 is integrally formed on the bobbin
portion 14b by film technology. The film technology mentioned here is a technology of forming a
film by vapor deposition or chemical plating, and then etching the film to form a film of a desired
shape (in this embodiment, a voice coil 19), or mask vapor deposition, mask plating Technology
to form a film of the desired shape. Note that the processing of the terminal of the voice coil 19 is
not shown in detail (· is drawn out from a part of the cone portion 14C, and electrically
connected to the external input terminal 8b attached to the frame 8 from there by a lead wire.
ing. FIG. 5 is a side view of an electrodynamic thin speaker showing another embodiment of the
present invention, and FIG. 6 is a partial enlarged view of FIG. 5. The technique of FIG. Shows an
embodiment applied to FIG. That is, the speaker vibrating member 24 includes a cone 24C for
radiating direct sound into the air, a bobbin 24b for mounting a voice coil, an edge 24a, and a
voice coil 29, and is a single synthetic resin. Thus, the edge 24a1 bobbin portion 24b1 and the
cone portion 24C are integrally formed, and the voice coil 29 is integrally formed on the povin
portion 24b by the membrane technology.
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A permanent magnet 21 and yokes 22a and 22b form a magnetic circuit 6 by the permanent
magnet 21 and the yokes 22a and 22b. Reference numeral 28 denotes a frame fixed to the outer
peripheral surface of the yoke 22b of the magnetic circuit 26 so as to be substantially flush with
the yoke 22a. A structure for fixing and supporting the outer peripheral portion 24d of the
speaker vibrating member 24EndPage: 2 by the peripheral portion 28a of the frame 28 Note that
the processing of the terminal of the voice coil 29 is shown in detail and shown in FIG. Ideally,
each vibration of the cone portion 14C1 of the speaker vibrating member 14 of FIG. 3 and the
cone portion 24C of the speaker vibrating member 24 of FIG. In the high-pitched range, the cone
(14C) (..24C) vibrates separately, that is, split vibration occurs, and the sound pressure emitted
from the speaker increases or decreases. This is one of the causes of peaks and valleys in the
output sound pressure frequency characteristic in the high range of the single cone type
loudspeaker. In order to suppress this divisional vibration, it is known that the concentrated
stiffness of the cone portion 14C or 24C should be increased. For example, the cone portion may
have a thickness change or a shape change ( Various measures have been taken. FIG. 7 shows
another embodiment of the speaker vibrating member 14 of FIG. 3. FIG. 7 (A) is a side sectional
view, FIG. 7 (B) is a plan view, and FIG. FIG. 9 is a plan view of the speaker vibrating member 14
showing another embodiment of FIG. 7, both of which are formed by a film technology for
forming the voice coil 19 in order to increase the concentrated stiffness of the cone portion 14C.
The example which simultaneously formed the metal layer 20 for stiffness control of the cone
part 14C in the cone surface 14d of the cone part 14C is shown. FIG. 7 shows an embodiment in
which the metal layer 20 for stiffness control is arranged concentrically, and FIG. 8 shows an
embodiment in which the metal layer 20 is arranged radially, both forming the metal layer 20
symmetrically about the center of the cone portion 14C. In the embodiment, the concentrated
stiffness of the cone portion 14C is increased. However, the metal layer 20 for adjusting the
stiffness may of course be formed in a spiral shape. Further, although an embodiment in which a
metal layer for adjusting the stiffness is formed on the speaker vibrating member 24 of FIG. 5 is
not shown, the concentrated stiffness of the cone portion 24C is improved as in FIGS. 7 and 8. I
was able to. As described above, according to the present invention, the cone portion for
radiating the sound directly into the air and the bobbin portion for mounting the voice coil are
integrally formed of one sheet of synthetic resin, and the voice is further formed on the bobbin
Since the vibration member for the speaker is formed by the manufacturing method in which the
coil is integrally formed, the number of bonding steps involved in the unnecessary adhesion of
the cone portion and the bobbin portion is reduced and the voice coil is integrally formed on the
bobbin by film technology. The reduction of the winding process of the voice coil makes it
possible to greatly reduce the manufacturing time of the speaker and simplify the manufacture.
Furthermore, since the cone part, the bobbin part and the voice coil can be integrally formed, the
number of parts is also reduced. It is possible to significantly reduce the manufacturing cost.
In terms of characteristics, since the voice coil is integrally formed on the vibrating member for
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the speaker by the membrane technology, the winding state of the voice coil can be made
uniform and the weight can be reduced, and the efficiency of the speaker can be increased. It is
also possible to prevent the occurrence of distortion of the reproduction output due to the
vibration between metal wires used as coils. Also, since the voice coil is formed by film
technology, the total thickness of the bobbin and coil can not be as thick as shown in FIG. 1, and
the distance of the gap of the magnetic circuit can be reduced to obtain the flux density of the
gap. It is possible to increase the sound pressure of the speaker because it can. Furthermore,
since no adhesive is used to connect the cone portion and the bobbin portion, the adhesive does
not adhere to the damper or the voice coil, and deterioration of the speaker characteristics can
be prevented. Furthermore, if the film technology for forming the voice coil is used to
simultaneously form a metal layer for adjusting the stiffness of the cone on the cone surface, the
concentrated stiffness of the cone can be easily increased. It is possible to piston the high-pitched
portion of the cone and to eliminate peaks and valleys of the output sound pressure frequency
characteristics in the high-pitched range, and to easily obtain a speaker having a flat output
sound pressure over a wide frequency band. If the metal layer for adjusting the stiffness is
formed as a thin speaker as shown in FIG. 5, the speaker of thin EndPage: 3 has a wide
reproduction frequency band without making the cone 24C itself uneven. It is very effective for
thinning the speaker. In the embodiment of the present invention, the edge is also formed
integrally with the speaker vibrating member to reduce the cost (but, of course, the edge may be
formed separately. It is also apparent that the metal layer for stiffness adjustment may be used as
a terminal for terminal processing of the voice coil by electrically connecting the voice coil and
the metal layer for stiffness adjustment.
4. Brief description of the drawings FIG. 1 is a side view of a conventional electrodynamic
speaker, FIG. 2 is a partial enlarged view of FIG. 1, and FIG. 3 is an electrodynamic speaker
showing one embodiment of the present invention. 4 is a partial enlarged view of FIG. 3, and FIG.
5 is a plan view of a speaker vibrating member showing another embodiment of the present
invention. 14.24 .......... speaker vibrating member 14b, 24 +) ----- bobbin 14C124C · · · · · · cone
9.19.29 ----- voice coil 20 .................. stiffness adjustment of the gold Tung layer applicant Citizen
Watch Co. first 1v4 Figure 2 Figure 3 Figure 4 EndPage: 4 Figure 5 second 6 Figure 7 (B)
EndPage: 5
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