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JP2004135115

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2004135115
An object of the present invention is to prevent disconnection of lead wires. A voice coil is
connected to a tinsel wire via a lead wire. The cone 15 functions as a diaphragm. The lead wire
13 on the cone 15 is elastic since it has a parabola shape. Therefore, even if the cone 15 vibrates,
the lead wire 13 acts as a damper, so that disconnection can be effectively prevented. [Selected
figure] Figure 1
スピーカ
TECHNICAL FIELD The present invention belongs to the technical field of a speaker. A speaker is
a so-called electro-acoustic transducer that converts an electrical signal (electrical energy) from
an amplifier into an acoustic signal (acoustic energy). The principle of operation is generally that
the diaphragm is driven to vibrate by a voice coil disposed in the magnetic circuit. Then, the lead
wire of the voice coil is drawn straight up to the tinsel wire assembled to the diaphragm or the
external terminal, and is fixed by solder or the like. [0003] Incidentally, with the reduction in size
and weight of the speaker, there is a demand for reducing the weight of the voice coil. For this
purpose, it is necessary to make the wire of the voice coil thin or to use a wire having a light
specific gravity such as aluminum. However, thin wires tend to have reduced strength, and wires
with light specific gravity generally tend to be weak. On the other hand, during operation of the
speaker, a large acceleration acts on the lead wire of the voice coil. Therefore, if the voice coil
wire is made thin or an aluminum-based wire (eg, pure aluminum wire, aluminum alloy ship,
copper clad aluminum wire, etc.) is used for the voice coil, the voice coil lead is bent. It is easily
pulled off and breaks easily. For this reason, there is a method for preventing breakage by
providing slack to the lead wire, but there is a limit to improvement in reliability. Although there
is also a method of connecting the lead wire to another strong wire, there is a problem such as an
increase in cost and an increase in weight of the voice coil. The present invention has been made
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in view of the above-described circumstances, and makes the reduction in size or weight of a
speaker an example of the problem to be solved. According to a first aspect of the present
invention, there is provided a speaker including a diaphragm and a voice coil for vibrating the
diaphragm by an electromagnetic force, wherein the lead wire of the voice coil is formed into a
spiral. It is characterized by having done. DETAILED DESCRIPTION OF THE INVENTION A
loudspeaker according to an embodiment of the present invention comprises a diaphragm and a
voice coil for vibrating the diaphragm by an electromagnetic force. The voice coil is supplied with
an electrical signal through a lead. And part or all of the lead wire of the voice coil has a spiral
shape. Here, if the speaker is a cone speaker, it is preferable to provide a spiral-shaped lead wire
on the diaphragm.
Since the lead wire can be made elastic by making the shape of the lead wire spiral, the lead wire
itself acts as a damper even when the diaphragm is vibrated, and it becomes possible to prevent
disconnection. Here, the spiral shape of the lead wire is preferably circular or square. The square
includes polygons such as triangles and quadrilaterals. Further, the speaker includes a cone
speaker and a dome speaker. In the case of a dome speaker, the diaphragm has a dome shape,
and an edge damper portion is provided on the outer periphery of the diaphragm. Also, the voice
coil is provided in a recess formed between the diaphragm and the edge damper portion. And a
lead wire will be provided on an edge damper part. The edge damper portion vibrates as the
diaphragm moves up and down, but since the lead wire has a spiral shape, it acts as a damper.
Therefore, disconnection of the lead wire can be effectively prevented. EXAMPLE Next, an
example will be described. 【0010】 <1. First Embodiment> FIG. 1 is a partial crosssectional perspective view showing a structure of a cone speaker 10 according to a first
embodiment of the present invention. FIG. 2 is a cross-sectional view of the cone speaker 10. As
shown in these figures, the cone speaker 10 includes a coil bobbin 11, a voice coil 12, a lead wire
13, a tinsel wire 14, a cone 15, and an edge portion 15a. The coil bobbin 11 has a cylindrical
shape, and a voice coil 12 is wound around the outer wall thereof. The voice coil 12 is opposed
to a ring-shaped magnet (not shown) via a predetermined gap. The cone 15 functions as a
diaphragm, and its end is fixed to a frame (not shown) via the edge 15 a. In addition, a tinsel cord
14 is attached to the cone 15. One end of the tinsel wire 14 is connected to the lead wire 13 on
the cone 15, while the other end of the tinsel wire 14 is connected to an external terminal (not
shown). An electrical signal is supplied to the external terminal from an amplifier or the like via a
speaker cable. The lead wire 13 is drawn out from the winding start and the winding end of the
voice coil 12 and is integral with the wire of the voice coil 12. Therefore, the same wire is used
for the electric wire of the voice coil 12 and the lead wire 13. As the electric wire, for example, a
copper wire, a pure aluminum wire, an aluminum alloy wire, a copper clad aluminum wire, a
copper clad aluminum alloy wire or the like can be used.
The copper clad aluminum wire is a pure aluminum wire coated with copper at an area ratio of 1
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to 50%, and the copper clad aluminum alloy wire is a wire coated with copper at an area ratio of
1 to 50% of a pure aluminum alloy wire. is there. For example, CCAW made by Tokyo Special
Electric Cable corresponds. The electric wire is coated with an insulation / fusion coating on all
or part thereof. The lead wire 13 of the present embodiment can be divided into a straight
portion 13 a along the outer wall of the coil bobbin 11 and a spiral portion 13 b located on the
cone 15 according to its shape. The straight portion 13a is fixed to the outer wall of the coil
bobbin 11 with an adhesive or the like, while the spiral portion 13b may be fixed onto the cone
15 with an adhesive or the like, or may not be fixed. Further, the end where the spiral portion
13b is connected to the tinsel wire 14 needs to peel off the coating in order to obtain conduction,
but the spiral portion 13b other than the end may or may not be covered. The reason for
adopting such a structure is as follows. That is, since the cone 15 functions as a diaphragm, a
large force acts on the lead wire 13 on the cone 15. Therefore, the disconnection is likely to
occur exclusively in this portion. Therefore, in the spiral portion 13b, the lead wire 13 has a
spiral shape to give elasticity. As a result, even if a large force is applied to the spiral portion 13a
of the lead wire 13 in accordance with the vibration of the cone 15, the spiral portion 13a acts as
a damper, so that disconnection can be prevented. On the other hand, since the straight portion
13 a does not move along with the vibration of the cone 15, there is no need to make it into a
spiral shape. In addition, the spiral shape increases the weight per pulling distance. Therefore, in
the straight portion 13a where a large force does not act, in order to reduce the weight, the
shape of the lead 13 is made straight. As described above, according to the present embodiment,
it is possible to prevent the disconnection of the lead wire 13 to improve the reliability of the
cone speaker 10 and to reduce the weight of the cone speaker 10. 【0017】 <2. Second
Embodiment> FIG. 3 is a cross-sectional view showing a structure of a dome speaker 20
according to a second embodiment of the present invention, and FIG. 4 is a partially enlarged
view thereof. In the dome speaker 20, the disk-shaped pole plate 21, the magnet 22, and the
yoke 23 constitute a magnetic circuit having a ring-shaped magnetic gap.
The magnetic gap is an air gap in a portion where the side surface of the pole plate 21 and the
yoke 23 face each other, and has a substantially even spacing over the entire circumference.
Above the pole plate 1, a diaphragm (dome portion) 24 having a substantially elliptical spherical
dome shape is disposed. A recess 25 having a U-shaped cross section is provided in a ring shape
at the outer peripheral edge of the diaphragm 24, and an edge damper 26 is provided at the
outer peripheral edge of the recess 25. The outer peripheral edge portion of the edge damper 26
is a horizontal surface, and the edge damper 26 is fixed to a frame (not shown) here. The
diaphragm 24, the recess 25, and the edge damper 26 are integrally formed, for example, by
heat and pressure molding of a single resin film. The edge damper 26 elastically supports the
diaphragm 24 and the recess 25 together. In the recess 25, a cylindrical voice coil 27 formed by
winding an electric wire is fixed. Both ends of the wire of the voice coil 27 are drawn to the
outside of the magnetic circuit by the lead wire 28 and connected to external terminals (not
shown) not shown. The wire material of the voice coil 27 and the wire of the lead wire 28 is the
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same as that of the first embodiment. Here, the lead wire 28 has a spiral shape as shown in FIG. 4
and has elasticity. Since the edge damper 26 vibrates together with the diaphragm 24 and the
recess 25, the lead wire 28 on the edge damper 26 is bent or pulled. However, even if a large
force is applied to the lead wire 28 in accordance with the vibration of the diaphragm 24, the
lead wire 28 acts as a damper, so that disconnection can be prevented. As described above,
according to the present embodiment, it is possible to prevent the disconnection of the lead wire
28 to improve the reliability of the cone speaker 20 and to reduce the weight of the cone speaker
20. 【0021】 <3. Modifications> Although the embodiments of the present invention
have been described above, the present invention is not limited to the above-described
embodiments, and the following modifications can be made, for example. (1) In the first
embodiment described above, a part of the lead wire 13 is formed in a spiral shape, but the
whole may be formed in a spiral shape. Further, in the second embodiment described above, all
of the lead wires 28 are formed in a spiral shape, but of course, a part may be formed in a spiral
shape. (2) The spiral portion 13a of the lead 13 in the first embodiment described above or the
lead 28 of the second embodiment has a circular shape as shown in FIG. 5A. The shape may be a
quadrangular spiral shape as shown in FIG. 5B, or may be a triangular spiral shape as shown in
FIG.
Furthermore, the spiral shape may be flatly crushed. (3) The spiral portion 13a of the lead wire
13 of the first embodiment described above or the lead wire 28 of the second embodiment has
the core wire A wound with the lead wire 13 or 28 as shown in FIG. , May be produced by pulling
out the core rod A. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional
perspective view showing a structure of a cone speaker 10 according to a first embodiment of
the present invention. FIG. 2 is a cross-sectional view of the cone speaker 10 of the embodiment.
FIG. 3 is a cross-sectional view of a dome speaker 20 according to a second embodiment. 4 is a
partial enlarged view of the dome speaker 20 shown in FIG. 3; 5 is a plan view showing an
example of the shape of a lead 13b or 28. FIG. FIG. 6 is an explanatory view for explaining a
method of forming a spiral shape in the lead wire 13b or 28; [Description of the code] 10 cone
speaker 12, 27 voice coil 13, 28 tinsel wire 15 cone 24 diaphragm
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