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JP2001169390

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DESCRIPTION JP2001169390
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic speaker, and more particularly to the structure of a voice coil.
[0002]
2. Description of the Related Art In recent years, as a sound device for mobile communication
equipment such as a portable telephone, a thin and high-performance electrodynamic speaker
has been widely used. An example of such a conventional speaker will be described based on the
drawings. FIG. 4 is a cross-sectional view of a conventional electrodynamic speaker.
[0003]
First, the configuration of this speaker will be described. FIG. 4 shows a longitudinal section at
the center of the loudspeaker, the right half being symmetrical is omitted. An annular frame 1
has an inner step 1a and an intermediate step 1b. Reference numeral 2 denotes a plate-shaped
yoke made of a magnetic material fixed to the inner circumferential step 1a. Reference numeral 3
denotes a disk-shaped permanent magnet fixed at the center of the bottom of the yoke 2 and
having upper and lower magnetic poles, and 4 denotes a disk-shaped top plate fixed to the
surface of the permanent magnet 3 on the other magnetic pole side. A magnetic circuit is formed
by the permanent magnet 3 through the gap between the upper end of the yoke 2 and the
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peripheral portion of the top plate 4.
[0004]
Reference numeral 15 denotes a substantially spherical diaphragm integrally formed of a plastic
material having a flat portion 15a near the peripheral portion and a curved portion following
this, and the peripheral portion 15b forms a flat surface, and the middle step portion 1b of the
frame 1 Adhesively fixed to 16 is a voice coil which is a cylindrical air core coil formed by
aligning and winding a coil winding which is an enamel coated copper wire in a rectangular cross
section, and its upper surface is adhered to the lower surface of the flat portion 15 a of the
diaphragm 15 It is fixed. The voice coil 16 is inserted into the gap between the top plate 4
peripheral portion and the upper end of the yoke 2 to a depth approximately half the coil length.
[0005]
Next, a method of assembling this speaker will be described. First, the surface on one magnetic
pole side of the permanent magnet 3 is bonded to the central portion of the yoke 2, and then the
top plate 4 is bonded and fixed to the surface on the other magnetic pole side of the permanent
magnet 3. On the other hand, the voice coil 16 is bonded to the flat portion 15a of the diaphragm
15 with its center position aligned. Next, the yoke 2 is bonded to the inner step 1a of the frame 1,
and finally the diaphragm 15 with the voice coil 16 bonded to the middle step 1b is bonded.
When an audio signal is input to the voice coil 16 of the speaker, the diaphragm 15 vibrates up
and down to emit a sound in accordance with Fleming's left-hand rule.
[0006]
However, in the above-described speaker, in the step of bonding the voice coil 16 to the
diaphragm 15, it is first necessary to apply an appropriate amount of adhesive to the flat portion
15a of the diaphragm 15. At this time, the nozzle of the dispenser containing the adhesive is
operated to draw a circular arc trajectory on a plane. In this operation, it is difficult to maintain
the application position so as not to deviate from the accurate trajectory. Therefore, it becomes
difficult to keep the amount of adhesive applied along the track constant. Further, when the
center position of the diaphragm 15 and the voice coil 16 are aligned, accurate positioning is
difficult because the flat surfaces without alignment guide are butted. From the above, it takes a
lot of man-hours for bonding work, and there is a large variation in voice coil bonding position
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accuracy, so that the stability due to the characteristic surface variation is lacking, leading to an
increase in the cost of the speaker. Furthermore, since the air core voice coil 16 is used, the
aligned coil winding may collapse during handling.
[0007]
The above invention has been made to solve such conventional problems, and the object thereof
is to eliminate the voice coil bonding process and solve various problems associated with
bonding, and the number of bonding steps between the diaphragm and the voice coil. It is an
object of the present invention to provide an inexpensive speaker by reducing the volume of the
voice coil, preventing winding distortion of the voice coil, and stabilizing the quality by improving
the position accuracy of the voice coil.
[0008]
In order to solve the above-mentioned problems, the present invention comprises a permanent
magnet, a yoke fixed to one magnetic pole side of the permanent magnet, and a top plate fixed to
the other magnetic pole side. In an electrodynamic speaker comprising a frame to which the yoke
is fixed, a diaphragm fixed to the frame, and a voice coil fixed to the diaphragm, a protrusion is
formed on the diaphragm, and the voice coil It is characterized in that a coil winding is wound
around a protrusion.
[0009]
The invention according to claim 2 of the present invention is characterized in that, in the
invention according to claim 1, the projection is formed integrally with the diaphragm.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail below with reference to the drawings.
FIG. 1 is a cross-sectional view of a speaker according to a first embodiment of the present
invention, FIG. 2 is an enlarged view of an essential part of FIG. 1, and FIG. 3 explains a winding
method of coil windings in the first embodiment. It is a partial cross section side view.
[0011]
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First, the configuration of an electrodynamic speaker according to a first embodiment of the
present invention will be described.
In FIG. 1, reference numeral 5 denotes a diaphragm, and the diaphragm 5 is formed such that a
protrusion 5 c is inserted into the gap between the top plate 4 and the yoke 2 following the
periphery of the substantially spherical portion in the center, The flat peripheral portion 5b is
adhesively fixed to the frame 1 middle step 1b.
A voice coil 6 is formed by winding a coil winding 7 around the periphery of the protrusion 5c,
as shown in FIG. That is, the protrusion 5 c plays a role of a winding frame of the voice coil 6.
Since the other configuration is the same as that of the conventional case, the same reference
numerals and names as the conventional case are given to the respective constituent elements,
and the description thereof is omitted. The protrusion 5c may be a cylindrical protrusion
continuous on the circumference, or may be a discontinuous protrusion.
[0012]
Next, a method of manufacturing the diaphragm 5 of the present embodiment will be described.
First, the diaphragm 5 is integrally formed by heat press molding in a mold heated from a plastic
material such as polycarbonate, polyetherimide, polyimide, pen or the like, and then the outer
shape is cut and formed by an outer shape cutting die. Next, a method of winding the voice coil 6
will be described with reference to FIG. In FIG. 3, 21 is a spindle motor of a winding machine, and
22 is a jig held on 21 spindles of the spindle motor. Reference numeral 23 denotes a wire guide
for guiding the coil winding 7 in the rotational axis direction. The diaphragm 5 is attached to the
jig 22 on the upper surface side. The coil winding 7 fixes the winding start side coil terminal 7 a
to the spindle motor 21. As the spindle motor 21 rotates, the coil winding 7 is wound along the
outer periphery of the protrusion 5 c protruding from the jig 22 while being guided by the wire
guide 23. End treatment of the coil winding 7 and coating with an adhesive are performed to
complete the diaphragm 5 with the voice coil 6.
[0013]
Next, the effects of the present embodiment will be described. Since the diaphragm 5 has a role
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equivalent to the winding frame of the voice coil 6, the step of bonding the voice coil 16 to the
conventional diaphragm 15 is reduced, and various problems associated with this step are
solved. . In addition, since the projection 5c plays a role corresponding to a winding frame, no
winding collapse occurs and the positional accuracy of the voice coil is improved, leading to the
stabilization of the characteristics and the improvement of the quality. It leads to the reduction.
[0014]
As described above, according to the present invention, since the diaphragm has a role of a coil
winding frame, the voice coil bonding process can be reduced, and the coil winding can be
wound directly on the diaphragm. Since the voice coil winding can be prevented, the voice coil
bonding process can be prevented, the voice coil bonding process can be abolished and the voice
coil position accuracy can be improved, leading to the stabilization of the characteristics and the
improvement of the quality. Can be reduced.
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