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JPH0984192

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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 JPH0984192
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for
example, a terminal connection method of a winding coil used in an electromagnetic
electroacoustic transducer and a terminal connection structure of a winding coil, and in
particular, a coil end of the winding coil When connecting with a lead terminal, the insulation
coating material of a coil end is lose | disappeared beforehand, the core wire is exposed, and it is
related with what soldered the coil end of a winding coil and a lead terminal in the state.
[0002]
2. Description of the Related Art A conventional electromagnetic electro-acoustic transducer is
constructed, for example, as shown in FIGS. First, there is a case 201. The left side of the case
201 in FIG. 17 is closed, and the right side in FIG. 17 is an opening 203. A base member 205 is
attached to the side of the opening 203 to close the opening 203. A base 207 is attached to the
base member 205, and an iron core 209 is attached to a central position of the base 207.
[0003]
A coil (magnet wire) 211 is attached to the outer periphery of the iron core 209, and a magnet
215 is installed on the outer periphery of the coil 211 with a gap 213 therebetween. A support
ring 217 is installed on the outer peripheral side of the magnet 215. A diaphragm (also referred
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to as an elastic plate or a resonance plate) 219 is attached to the left side step portion of the
support ring 217 in FIG. 17, and a central portion of the diaphragm 219 is an additional mass of
the diaphragm 219. A magnetic piece 221 is attached.
[0004]
In addition, as shown in FIG. 16, a pair of lead terminals 223 and 225 are provided on the base
member 205, and the coil end 211 a of the coil 211 already described above is disposed on the
pair of lead terminals 223 and 225. 211 b is extended and arranged. The coil ends 211a and
211b are connected and fixed to the pair of lead terminals 223 and 225 by soldering.
[0005]
In the electromagnetic type electroacoustic transducer having the above configuration, the
diaphragm 219 integrally provided with the magnetic piece 221 is in a state of being attracted
by the magnet 215 and thereby set with a certain polarity. There is. In this state, when current is
supplied to the coil 211 through the lead terminals 223 and 225, the iron core 209 is
electromagnetized to generate a magnetic field at its tip. At that time, when the magnetic field
generated by the coil 211 in the iron core 209 and the magnetic pole by the magnet 215 of the
diaphragm 219 have different polarities, the diaphragm 219 is attracted to the iron core 209.
When the magnetic field generated by the coil 211 in the iron core 209 and the magnetic pole of
the magnet 215 of the diaphragm 219 have the same polarity, the diaphragm 219 repels the
iron core 209. Therefore, the diaphragm 219 repeats the above-described operation by
intermittently supplying a current in any direction. That is, the diaphragm 219 vibrates at a
predetermined frequency, and the vibration generates a sound.
[0006]
SUMMARY OF THE INVENTION The above-described conventional arrangement has the
following problems. As described above, the coil ends 211a and 211b of the coil 211 are
connected and fixed to the pair of lead terminals 223 and 225 by soldering. Also, in
consideration of heat resistance and solderability, for example, a copper wire coated with
polyurethane is used for the coil 211, and at the time of soldering, the heat is used to melt and
remove the polyurethane coating simultaneously with soldering. I was supposed to do it. That is,
the polyurethane coating on the coil ends 211a and 211b is melted and removed by heat at the
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time of soldering to expose the core, and the exposed core is soldered to the lead terminals 223
and 225. At that time, in order to melt and remove the polyurethane coating, there is a situation
that heating must be performed for a long time under high heat (usually 400 ° C. or more). In
particular, components susceptible to heat {eg, materials susceptible to thermal effects on
peripheral portions of lead terminals 223, 225 {eg, thermoplastic resin, various adhesives
(copper foil adhesive on printed circuit board), etc.} In the case where the base material of the
present invention has a basic structure, there is concern that the peripheral portions of the lead
terminals 223 and 225 may be adversely affected. Furthermore, if the polyurethane coating is
insufficiently melted and removed, there is a possibility that conduction failure may occur, and
conversely, there is also a possibility that the coil ends 211a and 211b of the coil 211 may be
disconnected due to excessive heat After all, there is a problem that the soldering operation itself
requires skill.
[0007]
The present invention has been made based on these points, and the object of the present
invention is to make it possible to perform desired soldering in a short time without requiring
skill, and to eliminate conduction defects and disconnections. It is an object of the present
invention to provide a winding coil end connection method and a winding coil end connection
structure capable of improving the reliability of the connection portion.
[0008]
In order to achieve the above object, the terminal connection method for a winding coil according
to the present invention comprises the steps of: arranging a coil end of the winding coil on a lead
terminal; And exposing the core wire, and soldering the joint portion of the coil end and the lead
terminal.
At that time, it is conceivable to remove the insulating covering material by irradiating the coil
end with heating light. Moreover, it is possible to make the said heating light into a laser beam. In
addition, it is conceivable to use a base material made of a material that is susceptible to thermal
influence as a basic structure at the periphery of the lead terminal. Moreover, as a winding coil, it
is considered that it is a winding coil used for an electromagnetic type electroacoustic transducer.
[0009]
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That is, in the case of the end connection method of the wound coil according to the present
invention, the insulation coating material at the end of the coil is removed to expose the core
wire instead of the conventional connection by soldering. Then, the coil end and the lead terminal
are connected by soldering. As a method of removing the insulation coating material at the end
of the coil to expose the core wire, for example, irradiation of heating light is considered, and in
that case, it is considered to use laser light, for example. Further, in the case where the lead
terminal is basically made of a substrate made of a material susceptible to thermal influence,
desired connection processing can be performed without burning out the substrate susceptible to
the thermal influence. As a material susceptible to thermal influence, for example, thermoplastic
resin, various adhesives (copper foil adhesive on printed circuit board), etc. can be considered.
Moreover, in the case of the terminal connection method of the winding coil according to the
present invention, the application of the winding coil is not particularly limited, but for example,
the terminal of the winding coil used for the electromagnetic type electroacoustic transducer
When connecting, it can be effectively applied.
[0010]
The end connection structure of the winding coil according to the present invention claims the
connection structure obtained by the end connection method of the winding coil.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the
present invention will be described below with reference to FIGS.
This first embodiment is an application of the present invention to the manufacture of an
electromagnetic electroacoustic transducer, and first, with reference to FIGS. 1 to 3, the structure
of the electromagnetic electroacoustic transducer will be described. Do. FIG. 1 shows that a
plurality of (four in the figure) electromagnetic electroacoustic transducers are connected in
series via the terminal 1, and the individual terminals are cut later by cutting the terminal 1 in
place. The electromagnetic type electroacoustic transducer of
[0012]
Then, if it demonstrates from the structure of each electromagnetic type electroacoustic
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transducer, there is the base member 3 and the base 5 is attached to the inner side of this base
member 3. An iron core 7 is attached to the base 5, and a coil (magnet wire) 9 is attached to the
outer periphery of the iron core 7 in a wound state. The coil ends 9a and 9b at both ends of the
coil 9 are disposed so as to pass over the lead terminals 11 and 13, as shown in FIG. The lead
terminals 11 and 13 are provided integrally with the terminal 1 described above.
[0013]
A magnet 15 is disposed on the outer peripheral side of the coil 9, and a support ring 17 is
installed on the outer periphery of the magnet 15. A diaphragm (also referred to as a resonance
plate or an elastic plate) 19 is disposed at the stepped portion of the support ring 17, and a
magnetic piece 21 as an additional mass of the diaphragm 19 is provided at the center of the
diaphragm 19. It is attached.
[0014]
In the electromagnetic type electroacoustic transducer having the above configuration, the
diaphragm 19 integrally provided with the magnetic piece 21 is in a state of being attracted by
the magnet 15 and thereby set with a certain fixed polarity. There is. In this state, when current
is supplied to the coil 9 through the lead terminals 11 and 13, the iron core 7 is made into an
electromagnet and a magnetic field is generated at the tip thereof. At that time, when the
magnetic field generated by the coil 9 in the iron core 7 and the magnetic pole by the magnet 15
of the diaphragm 19 have different polarities, the diaphragm 19 is attracted to the iron core 7.
When the magnetic field generated by the coil 9 in the iron core 7 and the magnetic pole of the
magnet 15 of the diaphragm 19 have the same polarity, the diaphragm 19 repels the iron core 7.
Therefore, the diaphragm 19 repeats the above-described operation by intermittently supplying a
current in any direction. That is, the diaphragm 19 vibrates at a predetermined frequency, and
the vibration generates a sound.
[0015]
Next, an operation of soldering the coil ends 9a and 9b of the coil 9 to the lead terminals 11 and
13 will be described. First, a plurality of electromagnetic electroacoustic transducers shown in
FIG. 1 to FIG. 3, that is, a plurality of (four in the drawing) electromagnetic electroacoustic
transducers connected in series via the terminal 1 The electromagnetic electroacoustic
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transducer group is set on the base 31 as shown in FIG. The base 31 has a plate-like shape, and a
plurality of positioning pins 33 project at predetermined positions. Those connected in series via
the terminal 1 are positioned on the base 31 by the plurality of positioning pins 33. Also,
magnets are attached to appropriate positions on the base 31, and the electromagnetic
electroacoustic transducers are adsorbed by the magnets via the terminal 1. That is, the
electromagnetic electroacoustic transducer group is attracted by the magnet in a state of being
positioned by the plurality of positioning pins 33 via the terminal 1, and thereby set in a
predetermined state.
[0016]
On the lower side surface of the base 31 in FIG. 4, a winding / fixing portion 37 for winding and
fixing the coil ends 9 a and 9 b of the coil 9 of each electromagnetic type electroacoustic
transducer is provided. The winding and fixing portion 37 supports the rollers 39 and 41 via the
shaft 43, and includes a pair of left and right ones in which the roller 39 is biased by the spring
45 in the direction of the roller 41. Then, the coil ends 9a and 9b are wound and fixed
respectively. That is, the roller 39 is temporarily moved upward in FIG. 4 against the biasing
force of the spring 45 to form a gap between the roller 39 and the roller 41. The coil end 9a is
wound around the shaft 43 at the gap position using the gap. Then, when the bias to the roller
39 is released, the roller 39 is moved in the direction of the roller 41 by the spring 45, whereby
the winding state of the coil end 9a is fixed. The same applies to the coil end 9b side. As
described above, winding and fixing the coil ends 9a and 9b of the coil 9 of each electromagnetic
type electroacoustic transducer is a subsequent operation, that is, elimination of the insulation
coating material in a part of the coil ends 9a and 9b. Then, it is for improving the workability of
the soldering operation performed next. A through hole 47 and a through hole 49 are bored in
the base 31 and both are for positioning.
[0017]
Next, a configuration for removing the insulating covering material at the coil ends 9a and 9b of
the coil 9 will be described. FIG. 5 shows an outline of a laser irradiation apparatus for irradiating
a laser beam as heating light for that purpose. First, there is a rotating disc 51, and this rotating
disc 51 is on the outer peripheral part. A plurality of (in this case, three) mounts 53 are installed.
The base 31 shown in FIG. 4 is mounted on each of the mounts 53. Of course, the
electromagnetic electroacoustic transducer group in the state shown in FIG. 1 is set in the base
31. In addition, a laser beam irradiation device 55 is installed on a predetermined position on the
rotating disk 51.
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[0018]
The laser beam irradiation device 55 is configured as shown in FIG. First, there is a laser beam
irradiation apparatus main body 57, from which a laser beam 59 is irradiated. The irradiated
laser light is reflected by the scanning mirror 61, condensed by the fθ lens 63, and irradiated to
a predetermined position of the coil ends 9a and 9b of the coil 9 of any electromagnetic type
electroacoustic transducer. Thereby, the insulation covering material of the coil end 9a, 9b of the
irradiated part is made to lose | disappear. The attitude of the scanning mirror 61 is
appropriately controlled by a drive motor (not shown).
[0019]
Next, a soldering apparatus 65 used for a soldering operation performed after the insulating
coating material is eliminated will be described with reference to FIG. First, the movable table 67
is installed, and the movable table 67 is configured to move along the two grooves 69 and 71 in
the direction indicated by the arrow in the figure. A mounting base 73 is installed on the moving
base 67, and the base 31 shown in FIG. 4 is mounted on the mounting base 73. Of course, the
electromagnetic electroacoustic transducer group in the state shown in FIG. 1 is set in the base
31. Then, the soldering machine 75 is disposed, and the moving base 67 is moved in the
direction of the soldering machine 75 to position the base 31 at a predetermined position. In that
state, the coil ends 9a and 9b and the lead terminals 11 and 13 of the coil 9 of any
electromagnetic type electroacoustic transducer by the soldering machine 75, and the portion
where the insulating coating material of the coil ends 9a and 9b is lost And soldering.
[0020]
Next, with reference to FIGS. 8 to 11, the procedure for connecting the coil ends 9a and 9b and
the lead terminals 11 and 13 will be described. FIG. 8 is a flow chart showing the procedure for
connecting the coil ends 9a and 9b to the lead terminals 11 and 13. FIGS. 9 to 11 are enlarged
views of the coil ends 9a and 9b and the lead terminals 11 and 13. FIG. First, the iron core 7 is
crimped to the base 5 (step S1). Next, the base unit and the lead terminals are integrally formed
on the iron core 7 with a resin material to form the base member 3 (step S2). Then, the process
proceeds to step S3 to set a pallet. On the other hand, the magnet wire (coil 9) is wounded (step
S4), and the lengths of the terminals 9a and 9b are adjusted (step S5). And it transfers to step S6
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and adheres the coil 9 to it.
[0021]
Next, as shown in FIG. 9, the coil ends 9a and 9b are arranged on the lead terminals 11 and 13
(step S7), and in that state, as shown in FIG. The insulation covering material 81 at the ends 9a
and 9b is removed to expose the core 83 (step S8). At that time, the ends of the coil ends 9a and
9b are wound and fixed by the winding and fixing portion 37 shown in FIG. Next, as shown in
FIG. 11, soldering is performed centering on the portion where the core wire 83 is exposed (step
S9). The soldered portion is indicated by reference numeral 85 in FIG. Thus, the coil ends 9a and
9b and the lead terminals 11 and 13 are respectively connected.
[0022]
According to the present embodiment, the following effects can be achieved. First, before the
soldering, the insulating covering material 81 is made to disappear by irradiating a laser beam at
the coil ends 9a and 9b so that the core wire 83 is exposed. The core wire 83 and the lead
terminals 11 and 13 may be soldered, and therefore, a desired connection state can be obtained
without performing a soldering operation which requires skill as in the prior art. That is,
soldering can be performed in a short time without requiring any skill. In addition, since the
insulation covering material 81 is reliably made to disappear by the irradiation of the laser light,
the disappearance of the insulation covering material 81 is insufficient even without performing
the soldering operation which requires skill as in the prior art. Since there is no possibility that
the conduction defect resulting from occurs and the soldering operation is not performed at a
high temperature for a long time, there is no possibility that the disconnection due to the
overheating may occur. Therefore, the reliability of the connection can be greatly improved. In
addition, since the soldering operation is not performed at high temperature for a long time, the
thermal influence exerted on the surroundings can be alleviated. For example, the peripheral
portions of the lead terminals 11 and 13 are made of a material which is susceptible to thermal
influence. Even if the basic structure of the material, it does not damage them. Further, the
disappearance of the insulating covering material 81 by the irradiation of the laser light is very
efficient. That is, since it is possible to intensively irradiate the laser beam only to the
predetermined portions of the coil ends 9a and 9b, only the insulating covering material of that
portion can be efficiently eliminated. Incidentally, the time required for elimination is only about
0.3 to 0.5 seconds. Then, since the core wire 83 is exposed also in the subsequent soldering, the
process is completed in a very short time, and in the end, the time required for the connection
operation is shortened even in total.
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[0023]
Next, a second embodiment of the present invention will be described with reference to FIGS. 12
and 13. FIG. This shows an example in which the present invention is applied to the assembly of
different types of electromagnetic electroacoustic transducers, and FIGS. 12 and 13 show the
configuration of a part of the electromagnetic electroacoustic transducers. . That is, there is a
bobbin 101, and a coil 103 is mounted on the outer periphery of the bobbin 101 in a wound
state. The coil ends 103 a and 103 b at both ends of the coil 103 are twisted by rod-like lead
terminals 105 and 107 attached to the bobbin 101.
[0024]
Then, in this state, as in the case of the first embodiment, the coil ends 103a and 103b are
irradiated with laser light to remove the insulating covering material 109, and as shown in FIG.
Partially exposed. Next, solder. The soldered portion is indicated by reference numeral 113 in
FIG. Therefore, the same effect as that of the first embodiment can be obtained.
[0025]
Next, a third embodiment of the present invention will be described with reference to FIGS. 14
and 15. FIG. This shows an example in which the present invention is further applied to the
assembly of different types of electromagnetic electroacoustic transducers, and FIGS. 14 and 15
show the configuration of a part of the electromagnetic electroacoustic transducers. There is.
First, there is a base 121, and an iron core 123 is attached to the base 121. The coil 125 is
mounted on the outer periphery of the iron core 123 in a wound state, and the coil ends 125 a
and 125 b at both ends are connected to lead terminals 129 and 131 on the printed circuit board
122 attached to the base 121. It is disposed to pass over the copper foils 122a and 122b.
Moreover, the magnet 127 is arrange | positioned at intervals at the outer peripheral side of the
coil 125. As shown in FIG.
[0026]
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Then, in this state, as in the first embodiment and the second embodiment, the coil ends 125a
and 125b are irradiated with laser light to remove the insulating coating material 133, and the
core wire 135 is formed. Partially exposed. Next, solder. The soldered portion is indicated by
reference numeral 137 in FIG. Therefore, the same effects as those of the first and second
embodiments can be obtained.
[0027]
The present invention is not limited to the above embodiment. First, the chronological
relationship between the step of arranging the coil end of the winding coil on the lead terminal
and the step of removing the insulating covering material at the coil end to expose the core wire
does not particularly limit this. Any one may be ahead. Further, as a method for removing the
insulating covering material, other than irradiation with laser light, removal by heating light
irradiation, removal by mechanical means using a cutter, file or the like, and further according to
the material of the coil wire Various methods such as solvent removal may be considered. In the
case of using heating light, various conditions at the time of irradiation of the heating light may
be set as appropriate. Further, although the connection of the coil end of the coil of the
electromagnetic type electroacoustic transducer has been described as an example in the abovedescribed embodiment, it is needless to say that the invention can be applied to other various
coils.
[0028]
As described above, according to the winding coil end connection method and winding coil end
connection method according to the present invention, the insulation covering material at the
coil end is eliminated by, for example, irradiation with heating light. Since the core wire is
exposed, it is sufficient to simply connect the exposed core wire and the lead terminal at the time
of soldering, and it is not necessary to perform the soldering operation which requires skill as in
the prior art, but it is desired. The connection state can be obtained in a short time. In addition,
since the insulation coating material is surely eliminated by the irradiation of the heating light,
the disappearance of the insulation coating material is insufficient even without performing the
soldering operation which requires skill as in the prior art. There is no possibility of the
occurrence of a conduction defect resulting from the occurrence, and furthermore, the soldering
operation is not performed at high temperature for a long time, so that there is no possibility of
occurrence of disconnection due to overheating. As a result, the reliability of the connection can
be greatly improved. Also, since the soldering operation is not performed at high temperature for
a long time, it is possible to reduce the thermal influence given to the surroundings, for example,
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the basic structure of the base material of the material of which the peripheral part of the lead
terminal is easily thermally influenced. Even if you do, you will not damage them.
[0029]
Brief description of the drawings
[0030]
1 is a diagram showing a first embodiment of the present invention, is a diagram showing how a
plurality of electromagnetic electroacoustic transducers are connected in series through a
terminal.
[0031]
2 is a view showing the first embodiment of the present invention is a cross-sectional view of FIG.
1 II-II.
[0032]
3 is a view showing the first embodiment of the present invention, is a cross-sectional view
showing a portion III of FIG. 2 in an enlarged manner.
[0033]
4 is a top view showing a first embodiment of the present invention in which electromagnetic
electro-acoustic transducers connected in series through a terminal are set on a base.
[0034]
5 is a perspective view showing a schematic configuration of the entire apparatus when
irradiating a laser beam in the view showing the first embodiment of the present invention.
[0035]
6 is a diagram showing a first embodiment of the present invention is a diagram showing a
schematic configuration of a laser beam irradiator.
[0036]
7 is a view showing a first embodiment of the present invention, is a view showing a schematic
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configuration of the entire soldering apparatus.
[0037]
<Figure 8> It is the flowchart which shows the 1st execution form of this invention, is the
flowchart which shows the process which connects the coil end and the lead terminal.
[0038]
9 is a diagram showing a first embodiment of the present invention is a diagram showing the
process of connecting the coil end and the lead terminal.
[0039]
10 is a diagram showing a first embodiment of the present invention shows a step of connecting
the coil end and the lead terminal.
[0040]
<Figure 11> It is the figure which shows the form of 1st execution of this invention It is the
figure which shows the process which connects the coil end and the lead terminal.
[0041]
12 is a view showing a second embodiment of the present invention is a top view showing a part
of the configuration of different types of electromagnetic electro-acoustic transducer.
[0042]
13 is a view showing a second embodiment of the present invention, and is a cross-sectional view
taken along the line XIII-XIII of FIG.
[0043]
14 is a diagram showing a third embodiment of the present invention, is a top view showing a
part of the configuration of different types of electromagnetic electro-acoustic transducer.
[0044]
15 is a cross-sectional view taken along the line XV-XV in FIG. 14 showing the third embodiment
of the present invention.
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[0045]
FIG. 16 is a top view showing the electromagnetic type electroacoustic transducer cut away in
the view showing the conventional example.
[0046]
17 is a cross-sectional view taken along line XVII-XVII of FIG. 16 showing the conventional
example.
[0047]
Explanation of sign
[0048]
9 coil 9a coil end 9b coil end 11 lead terminal 13 lead terminal
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