JPH07131892A - Coil winding method - Google Patents

Abstract

PURPOSE:To reduce the man-hour of winding to save the labor by winding the pulled-out end part of an inner coil around the outside periphery of a curled bobbin to form an outer coil. CONSTITUTION:A bobbin 10 and a coil winding jig 11 are prepared, and a second outside periphery 11b of the coil winding jig 11 is coated with a release agent or a polytetrafluoroethylene. AD inner coil 2 is wound around the second outside periphery 11b subjected to this treatment. Lead start and terminal ends 2a and 2b of the inner coil 2 are inserted through a gap 13 formed between both edges of the bobbin 10 wound around the first outside periphery 11a or the outside periphery of the inner coil 2, and the outside periphery of the inner coil 2 is joined to the inside periphery of the bobbin 10 by adhesion. The terminal end 2b of the inner coil 2 led out from the gap 13 of the bobbin 10 is wound around the outside periphery of the bobbin 10 in the same winding direction as the inner coil to form an outer coil 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil winding method, and more particularly to a voice coil winding method for a speaker.

[0002]

2. Description of the Related Art Conventionally, as a method of winding a voice coil for a speaker, for example, as a method of double winding a coil on a voice coil bobbin, a method of double winding a voice coil on an outer diameter of a voice coil bobbin is used. A method of winding a coil around the inner diameter and outer diameter of a voice coil bobbin is known.

FIG. 9 shows an assembly diagram for winding a coil around the inner and outer circumferences of such a voice coil bobbin.
First, as shown in FIG. 9, an inner diameter coil 2 having a diameter such that the outer diameter is in contact with the inner diameter of a bobbin 1 made of a cylindrical synthetic resin, metal, paper or the like is used as an inner diameter coil jig made of a substantially cylindrical metal or the like. Three
To wind.

Next, the coil bobbin 1 is inserted through an outer diameter coil jig 4 made of a substantially columnar metal or the like, the inner diameter of the bobbin 1 being substantially the same as the outer diameter, and the outer diameter coil is fitted to the outer diameter of the coil bobbin 1. Wind 5.

The inner diameter coil 2 extracted from the inner diameter coil jig 3 is inserted into the inner diameter of the bobbin 1 around which the outer diameter coil 5 is extracted from the outer diameter coil jig 4, and is joined to the inner circumference.

Next, a hole 7 is formed in the bobbin 1 with a drill 6 or the like,
The winding end 2b of the inner diameter coil 2 is pulled out from this hole 7, the winding start end 2a is pulled out from the inner diameter of the bobbin, and the starting end 5a of the outer diameter coil 5 and the end 2b of the inner diameter coil 2 wound around the outer circumference of the bobbin 1 are connected. Connected, start end 2a of inner diameter coil 2
The lead holding paper 8 for treating the end 5b of the outer diameter coil 5 is attached to the inner and outer circumferences of the bobbin 1 to form the voice coil 9.

[0007]

According to the coil winding method described in the above-mentioned conventional structure, the lead of the end 2b of the inner diameter coil 2 inserted into the inner diameter of the bobbin 1 is inserted into the hole 7 of the bobbin 1 and soldered. In addition, there is a troublesome work of attaching the lead restraining paper 8 to the inner and outer circumferences of the bobbin 1.

Further, in order to insert the inner diameter coil 2 into the inner diameter of the bobbin 1 and join them, there is a problem that the inner diameter of the bobbin 1 and the outer diameter of the inner diameter coil 2 become loose. As the number of winding steps and the number of coil winding jigs increase, many steps are required, such as boring the bobbin 1, inserting the lead wire into the hole, and soldering the lead wire. There was a problem.

The present invention is intended to provide a coil winding method which solves the above-mentioned problems, and the purpose thereof is to eliminate the need to punch a voice coil bobbin.
The coil can be wound in the same manner by winding the coil around the outer circumference of the cylindrical bobbin in two layers, and the number of winding steps and the number of coil winding jigs are small, and there is no need for soldering between inner and outer diameter coils. To provide a simple coil winding method.

[0010]

As shown in FIG. 1, the coil winding method according to the present invention has inner and outer diameter coils 2 and 5 wound around the inner and outer diameters of a bobbin 10, respectively. In the method of winding a coil configured as described above, the step of winding the inner diameter coil 2 on the coil winding jig 11, and the strip-shaped member 1
Cover the inner diameter coil 2 with the bobbin 10 in which 2 is curled,
Gap 1 at the opposite edge where the end of the inner diameter coil 2 is curled
The step of drawing out from the space 3 and the outer diameter coil 5 are wound by winding the drawn-out inner diameter coil end on the outer periphery of the curled bobbin 10.

[0011]

According to the coil winding method of the present invention, the curled bobbin 10 is covered with the curled bobbin 10 having the strip-shaped member 12 on the inner diameter coil 2 wound around the coil winding jig 11. Inner diameter coil 2 pulled out from the gap 13 of 10
Since the winding end is continuously wound around the outer circumference of the bobbin 10 to form the outer diameter coil 5, it is possible to wind the coil in the same simple manner as winding the coil around the outer diameter of the bobbin. Become.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the coil winding method of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory view of a method of winding a voice coil for a speaker, which is one of the winding methods of the coil of the present invention, FIG. 2 is an external view showing an assembled state of the voice coil, and FIG. 3 is an enlarged side of a main part of the voice coil. A sectional view, FIG. 4 is a partial sectional side view, and FIG. 5 is a sectional view of a speaker using a voice coil. Parts corresponding to those in FIG.

In FIG. 1, reference numeral 12 is a strip-shaped member which is a strip-shaped bobbin 10 and is composed of kraft pulp (KP),
Paper such as sulfite pulp (SP), San tsubaki, goose bark or a mixture thereof, synthetic resin such as polyamide and polyimide,
It is composed of metals such as aluminum, copper, stainless steel, and brass.

The strip-shaped member 12 made of paper, synthetic resin, metal or the like is curled in a direction orthogonal to the longitudinal direction, and a predetermined gap 13 is formed between the curled opposing edges to make the bobbin 10 substantially cylindrical. Let me configure. The spacing of the gap 13 is selected to be slightly larger than the wire diameter of the coil wound as a voice coil for a tweeter or woofer. The wire diameter of the coil is selected to be about 0.1 mmφ to 0.3 mmφ. .

The coil winding jig 11 is formed into a stepped columnar shape as shown in FIG. 1, and is made of metal such as iron or steel. The diameter of the first outer diameter 11a of the coil winding jig 11 is selected to be substantially the same as the inner diameter of the bobbin 10 with the gap 13. The second outer diameter 11b, which is formed by cutting the tip end portion of the first outer diameter 11a to form a step, has a wire diameter dimension twice that of the inner diameter coil 2 wound around the second outer diameter and a second outer diameter 11b. The outer diameter of the bobbin 10 is substantially equal to the inner diameter of the bobbin 10.

In the above case, the coil winding jig is provided with the first and second outer diameters 11a and 11b.
The coil winding jig 11 may have a cylindrical or columnar shape having only the second outer diameter of the step portion.

The bobbin 10 and the coil winding jig 11 as described above are prepared, and the second outer diameter 11b of the coil winding jig 11 is prepared.
Alternatively, a release agent may be applied on the upper surface or polytetrafluoroethylene may be coated on the second outer diameter 11b. The inner diameter coil 2 is wound on the second outer diameter 11b which has been subjected to such treatment.

The wire material used for the inner diameter coil 2 is a copper wire insulation material having heat resistance, and a fusion splicing wire may be used to strengthen the connection with the inner or outer diameter of the bobbin 10. And In this case, for example, reactivation is performed with alcohol or the like, or it is cured again and firmly bonded to the inner and outer diameters of the bobbin via an adhesive.

As a matter of course, the wire may be not a fusion-bonded wire but an ordinary copper wire coated with enamel, polyester or urethane. In this case, the wire with an adhesive or the inner and outer surfaces of the bobbin 10 are coated with an adhesive. A winding process is performed.

Such a coil wire is first wound around the inner diameter coil 2 through a winding machine on the second outer diameter 11b of the coil winding jig 11 coated with the release agent shown in FIG.
Although not shown in FIG. 1, the leading end 2 of the lead of the inner diameter coil 2
a is locked to a locking portion provided on the coil winding jig 11.

As shown in an enlarged view of the winding state of the inner diameter coil 2 in FIG. 3, the release agent layer 15 is coated on the second outer diameter 11b of the coil winding jig 11 to form the inner diameter coil 2 Is wound on the release agent layer 15 by a predetermined number of turns. The bobbin 10 can be covered on the inner diameter coil 2. That is,
The strip-shaped member 12 is curled and wound on the first outer diameter 11a. Of course, the cylindrical jig 1 without the first outer diameter 11a
In the case of 1, the inner diameter coil 2 wound on the second outer diameter 11b
The strip-shaped member 12 may be wound on the top.

In this way, the lead end 2a and the end 2b of the lead of the inner diameter coil 2 are inserted into the gap 13 formed between the both end edges of the bobbin 10 wound on the first outer diameter 11a or the outer diameter of the inner diameter coil 2, The outer circumference of the inner diameter coil 2 is joined to the inner circumference of the bobbin 10 with an adhesive 14 as shown in FIG.

Next, the end 2b of the inner diameter coil 2 derived from the gap 13 of the bobbin 10 is wound around the outer circumference of the bobbin 10 in the same winding direction as the inner diameter coil 2, for example, in the counterclockwise direction. That is, the end 2b of the inner diameter coil 2 becomes the start end 5a of the outer diameter coil 5, and the end 5 of the outer diameter coil 5
As shown in FIG. 2, b is locked to the outer circumference of the bobbin 10 by the lead holding paper 8 together with the starting end 2a of the inner diameter coil 2. Of course Figure 3
The outer diameter coil 5 is attached to the bobbin 1 via the adhesive 16 as shown in FIG.
It is firmly bonded to the outer circumference of 0.

Next, by removing the bobbin 10 from the coil winding jig 11, the coil bobbin 9 as shown in FIGS. 2 and 4 is wound.

Although the inner and outer diameter coils 2 and 5 are shown as space winding in FIG. 1 in order to make the winding method easy to understand, close winding is also possible.

A configuration in which the voice coil 9 wound in this way is mounted on a direct radiation type speaker will be described with reference to FIG. In FIG. 5, a cylindrical magnet 18 is provided at a substantially central position of the U-shaped yoke 17. The magnet 18 is vertically magnetized with N and S poles. A substantially columnar pole 19 is fixed to the upper surface of the magnet 18 with an adhesive or the like, and a substantially rectangular plate 21 having a through hole 20 in the center is disposed on the upper surface of the U-shaped yoke 17. Is formed so as to form a magnetic path with the yoke 17 and the pole 19, and the pole 19 is formed so as to project into the through hole 20 of the plate 21.

The voice coil 9 has inner and outer diameter coils 2 and 5 wound around the inner and outer diameter portions of a bobbin 10, and the voice coil 9 is cantilevered via a damper 22 to a funnel-shaped frame 23 fixed on a plate 21. ing. Similarly, the upper end of the voice coil 9 is cantilevered by a frame 23 via a cone-shaped cone 24 and an edge 25, and the edge 25 is fixed on the frame 23 by a concentric sheet pile 26. Therefore,
The voice coil 9 vibrates up and down in the air gap between the pole 19 and the plate 21, and sound is emitted according to the audio signal sent to the voice coil 9.

As described above, according to the coil winding method of the present invention, the bobbin 10 in which the strip-shaped member is curled is attached to the jig while the inner diameter coil 2 and the outer diameter coil 5 are being wound. Inner and outer diameter coils can be easily wound around the inner and outer diameter portions of the.

Therefore, the exposed area of the coil is increased and the heat radiation area of the voice coil 9 is doubled as compared with the case where the coil is wound around the bobbin 10 in a multiple (for example, double) manner.
When the strip member 12 is made of metal, the heat dissipation efficiency from the bobbin 10 is further improved.

Further, the bonding area is approximately doubled as compared with the case where the coil is double wound with the inner diameter coil 2 side and the outer diameter coil 5 side, and the adhesive strength is also improved. In addition, when the inner diameter coil 2 described in the conventional winding method of FIG. 9 is fitted and fixed to the inner diameter of the bobbin 1, the allowance required only for the fitting and insertion is necessary. In the present invention, the bobbin 10 is covered after the inner diameter coil 2 is wound and the outer diameter coil 5 is further wound on the bobbin 10 in the present invention. Therefore, the bite between the bobbin 10 and the inner and outer coils 2 and 5 is extremely small. It will be good.

As described above, according to the present invention, the inner and outer coils are wound in separate steps, another jig is used, and the assembling step and bobbin boring step are not required, which is simple and easy. A coil winding method is obtained.

Another configuration example of the voice coil 9 of the present invention will be described with reference to FIGS. The bobbin 10 formed by curling the above strip-shaped member 12 has a sufficient mechanical strength in the portion where the inner and outer diameter coils 2 and 5 are wound because of the coil, but a gap 13 is formed in the upper end of the bobbin 10. As a result, the mechanical strength is insufficient as compared with a completely cylindrical bobbin. Therefore, in each of the embodiments shown in FIGS. 6 to 8, the reinforcing portion is provided on the upper end portion of the bobbin 10.

In the case of FIG. 6, an inner reinforcing portion 30 is provided inside the upper end of the bobbin 10. As the inner reinforcing portion 30, a strip-shaped member such as strip-shaped paper is curled to form a bobbin 10. It is affixed to the inside of the bobbin 10 with an adhesive or the like so that the gap 31 comes to the side opposite to the gap 13 and 180 degrees. This reinforcing portion is the same as in FIGS. 7 and 8 described later, but it may be a completely cylindrical reinforcing portion instead of a curled strip member.

In the case of FIG. 7, a strip-shaped member similar to that of FIG. 6 is curled to form an outer reinforcing portion 32 on the outer periphery of the upper end of the bobbin 10.
The reference numeral 33 indicates a gap of the outer reinforcing portion.

FIG. 8 shows the inner reinforcing portion 3 on the inner and outer circumferences of the bobbin 10.
0 and the outer reinforcing portion 32 are arranged.

These inner and outer reinforcing portions 30 and 32 are wound in the process of winding the inner diameter coil 2 and the outer diameter coil 5, for example, after winding the inner diameter coil 2 around the second outer diameter 11b of the jig 11 of the inner diameter coil 2.
Of the outer diameter 11a (the diameter of the first outer diameter 11a in this case is made smaller by the thickness of the inner reinforcing portion 31), the strip-shaped inner reinforcing portion 30 coated with an adhesive is wound,
Next, even if the bobbin 10 is wound around the inner reinforcing portion 30 and the outer diameter coil 5 is wound around the bobbin 10 in a winding step, the reinforcing portion 30 is attached to the bobbin 10 after winding. You may do so. In this way, the voice coil having sufficient strength can be wound very easily in one step or two steps.

Although the present invention has been described as a coil winding method for a voice coil, it goes without saying that it can be applied to a coil winding method for other high frequency coils. Further, the bobbin has been described as a bobbin in which a strip-shaped strip member is curled, but a bobbin in which a slit is formed on a cylindrical bobbin is also included in the category of the curled bobbin of the strip member of the present invention. is there.

[0038]

According to the coil winding method of the present invention, the number of jigs for winding the coil on the inner diameter side and the outer diameter side of the bobbin can be reduced, and the winding man-hour is reduced, resulting in a great labor saving. Can be omitted. In addition, the inner diameter coil wound around the bobbin can be very firmly adhered to the inner diameter of the bobbin.

[Brief description of drawings]

FIG. 1 is an explanatory view of a coil winding method of the present invention.

FIG. 2 is an external view of a coil obtained by the coil winding method of the present invention.

FIG. 3 is an enlarged side view of a main part of a coil obtained by the coil winding method of the present invention.

FIG. 4 is a side view showing a cross section of a part of the coil obtained by the coil winding method of the present invention.

FIG. 5 is a sectional view of a speaker using the coil of the present invention.

FIG. 6 is a side view in which a part of a coil showing another structure of the present invention is shown in section.

FIG. 7 is a side view (I) showing a cross section of a part of a coil showing still another configuration of the present invention.

FIG. 8 is a side view (II) showing a cross section of a part of a coil showing still another configuration of the present invention.

FIG. 9 is an explanatory diagram of assembly of a conventional coil.

[Explanation of symbols]

 2 Inner diameter coil 5 Outer diameter coil 9 Voice coil 1,10 Bobbin 11 Coil winding jig 13 Gap

Claims (3)

[Claims] 1. A method for winding a coil, wherein an inner diameter coil and an outer diameter coil are wound around an inner diameter and an outer diameter of a bobbin, respectively, wherein the inner diameter coil is wound on a coil winding jig, A step of covering the inner diameter coil with a curled bobbin on the inner diameter coil, and pulling out the end portion of the inner diameter coil from a gap between the curled opposite edges; A method for winding a coil, characterized in that the outer diameter coil is wound around the coil. 2. A bobbin that curls the strip-shaped member into a cylindrical shape so as to form a gap between opposite edges, a first outer diameter substantially the same as the inner diameter of the bobbin, and a first outer diameter smaller than the inner diameter of the bobbin. A coil winding jig having a substantially cylindrical shape having an outer diameter of 2; winding an inner diameter coil around a second outer diameter of the cylindrical coil winding jig; The bobbin so as to cover the first outer diameter and the inner diameter coil of the cylindrical coil winding jig, and the gap formed between the opposing edges of the curled strip member of the bobbin Pull out the inner diameter coil winding end,
The coil winding method according to claim 1, comprising a step of winding an outer diameter coil on the bobbin. 3. The curled bobbin is provided with a strip-shaped curled reinforcing member and / or a cylindrical reinforcing member on the inner diameter and / or outer diameter of the bobbin.
Alternatively, the coil winding method according to claim 2.