JP2003318043A - Method of treating winding terminal and winding bobbin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of treating the winding terminal used for manufacturing a wound component having a highly reliable terminal structure preventing the occurrence of failures, such as disconnection, etc., and to provide a winding bobbin. <P>SOLUTION: The wound component has gull-wing terminals each composed of a portion 2b near a planted section which is planted on the side face of an insulating bobbin and formed almost in parallel with the surface of a mounting substrate, a portion 4b connected to the mounting substrate, and an intermediate portion 3b connecting the portions 2b and 4b to each other. In this method of treating winding terminal, a lead wire to be wound around the terminal is wound around the portions 2b and 3b and a heat treatment, such as soldering, etc., performed for electrically connecting the wound lead wire to the terminal is performed on the intermediate portion 3b. Alternatively, a winding bobbin provided with a projecting section or recessed section in its intermediate portion to prevent a lead wire wound around the intermediate portion from being shifted to the planted section side of a terminal and the connected portion side of the terminal with a mounting substrate can be used. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding component such as a transformer or an inductor, and more particularly to a winding terminal treatment method and a winding bobbin suitable for use in a surface mounting winding component.

[0002]

2. Description of the Related Art Conventionally, surface mounting type winding parts are roughly classified into insulating bobbins having the following two types of terminal structures.

One is (1) where both ends of one terminal planted in an insulating bobbin are exposed to the outside from two places, one end serves as a portion around which a lead wire is wound, and the other end serves as a connecting portion with a substrate. Is a U-shaped terminal type. FIG. 6 shows a winding bobbin whose U-shaped terminal is embedded in an insulating bobbin. 6A is a plan view, FIG. 6B is a left side view, and FIG.
(C) is a front view.

In FIG. 6, 1a is a bobbin terminal implantation portion, 2a is a bobbin winding portion, 7b is a terminal portion around which a lead wire is wound, 8b is a terminal connecting portion with a substrate, and g is a bobbin resin. The parts of the internal terminals are shown.

(2) One terminal planted in the insulating bobbin is exposed to the outside from one place, and the portion where the lead wire is wound around the exposed terminal and the connection portion with the substrate are continuous. There is a type of gull wing type terminal formed by. First, FIG. 4 shows an overall view of a winding bobbin having a gull wing type terminal. 4 (a) is a front view thereof, and FIG. 4 (b) is a right side view thereof. In FIG. 4, 1a
Is a bobbin terminal installation portion, 1b is a gull wing type terminal, and 2a is a bobbin winding portion.

FIG. 5 shows a terminal structure of a winding component in which the gull wing type terminal is embedded in an insulating bobbin. It is the A section designated in FIG.

In FIG. 5, reference numeral 1a is a bobbin terminal implantation portion, 1b is a gull wing type terminal, 2b is a portion near the implantation portion around which a lead wire is wound, 3b is an intermediate portion, 4b is a connecting portion with a substrate, and c is a portion. Indicates a lead wire for winding, and f indicates a lead wire wound around a conventional terminal.

Next, the depth of heat treatment indicated by reference numeral e in FIG. 4 (the depth by which it is rotated by 90 ° and immersed in the melt surface of the solder bath).
Up to the root of the terminal installation part,
The stable electrical continuity between the lead wire and the terminal was secured.

[0009]

In the bobbin type of the above (1) or (2), in order to reduce the size of the entire winding component, especially when using a winding material of 0.1 mmφ or less, There was a problem.

First, in the bobbin having the terminal structure of the type (1), the terminal portion around which the lead wire is wound and the terminal portion mounted on the substrate are exposed to the outside from different portions of the bobbin. Therefore, even if a load is applied to the board mounting portion where an external load is likely to be applied, the load is not transmitted to the winding portion of the lead wire, so that the disconnection defect is less likely to occur. However, as described above, the board mounting part and the part around which the lead wire is wound are located at different positions, so the bobbin terminal installation part increases in the height direction or width direction (direction in which the mounting area expands). Therefore, the shape is not suitable for miniaturization and thinning.

On the other hand, in the bobbin of the (2) type terminal structure, the terminal portion around which the lead wire is wound and the terminal portion mounted on the substrate are exposed to the outside from one portion of the terminal planting portion.
Since it is configured in a book terminal, it is suitable for downsizing and thinning in terms of shape. However, because the lead wire winding part and the board mounting part are configured continuously, if a load occurs on the board mounting part that is easily subject to external load, the load is also applied to the lead wire winding part at the same time. Therefore, when the wire used for the winding is a thin wire (0.1 mmφ or less), a problem such as disconnection is likely to occur.

In particular, at the boundary between the soldered portion and the non-soldered portion of the lead wire, the copper is eroded by the solder, so that the disconnection is likely to occur.

In order to deal with the problem, a twist construction method has been used in which a lead wire is folded back a few times to form a lead portion of a plurality of twisted wires, which is wound around a terminal for reinforcement. However, in this case, the twisted wire processing time of the twisting method is long, and the man-hours that are almost double the normal winding man-hours are required.

In addition, the winding machine for performing the twisting method is
Since one unit is required for each axis, it is difficult to reduce the manufacturing cost.

Therefore, the present invention aims to provide a winding terminal processing method and a winding bobbin for obtaining a winding component having a highly reliable terminal structure which prevents a defect such as disconnection at low cost. And

[0016]

In order to solve the above problems, the present invention performs the following winding terminal processing.

That is, it is planted on the side surface of the insulating bobbin,
Winding of a winding component having a gull-wing type terminal, which is a terminal including a portion near a planting portion formed substantially parallel to the surface of a mounting board, a connection portion with the mounting board, and an intermediate portion connecting the two portions. In the wire terminal processing method, winding of the lead wire around the terminal is performed at a portion near the planting portion and the intermediate portion, and soldering for electrically connecting the wound lead wire and the terminal, etc. Is heat-treated at the intermediate portion.

Further, as a winding bobbin to which the method for treating a winding end of the present invention is applied, the lead wire wound around the intermediate portion is displaced toward the terminal planting portion side and the connection portion side with the mounting substrate. To avoid this, a winding bobbin having a convex portion or a concave portion at the intermediate portion may be used.

Further, the convex portion or the concave portion provided at the intermediate portion is a step provided on both sides in the width direction of the terminal, and the terminal width on the side of the connecting portion with the mounting board is on the implantation side. It can be formed to be narrower than the terminal width.

Further, the convex portion or the concave portion provided in the intermediate portion is a step provided on both sides in the width direction of the terminal, and the directions of the steps on both sides are opposite to each other as the terminal width increases or decreases. It can be formed as is.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a structure of a winding end of a gull wing type terminal in the present embodiment, and FIG.
1 is a perspective view thereof, FIG. 1 (b) is a plan view thereof, FIG. 1 (c) is a front view, and FIG. 1 (d) is a right side view.

Further, an overall view of the winding bobbin having the gull-wing type terminal of the present embodiment is shown in FIG. 4, and a portion A is shown in FIG.

In FIG. 1A, 1a is a bobbin terminal installation portion, 1b is a gull wing type terminal, c is a winding lead, and 2b is a portion near the installation portion formed substantially parallel to the board mounting surface. 4b is a connecting part with the substrate, and 3b is an intermediate part connecting them.

First, in order to wind the winding bobbin and then to treat the winding end, first, the lead wire is wound around the portion 2b near the planting portion of the gull wing type terminal 1b, and further in the middle. Also wrap around part 3b.

After that, it is immersed in the molten liquid surface of the solder bath up to the position of d which shows the heat treatment depth shown in FIG. As a result, no solder is applied to the part near the planting part, and the intermediate part 3b
The lead wire wound around is soldered.

Therefore, the conventional soldering is applied to the heat treatment depth e of FIG. 4, and the solder extends around the middle of the winding lead-out c, and in particular, the wire breaks near the boundary between the part where the solder is wound and the part where it is not. However, in the present embodiment, since the boundary can be a wound portion, stress concentration at the boundary can be avoided and the occurrence of disconnection can be suppressed.

[0028]

EXAMPLES Next, the present invention will be described in detail with reference to Examples.

(Embodiment 1) FIG. 2 is a view showing a winding terminal structure of a gull wing type terminal in the present embodiment 1. Figure 2
2A is a perspective view thereof, FIG. 2B is a plan view thereof, and FIG.
FIG. 2C is a front view, and FIG. 2D is a right side view.

FIG. 4 is an overall view of the winding bobbin having the gull wing type terminal already shown.

In FIG. 2A, 1a is a bobbin terminal implantation portion, 1b is a gull wing type terminal, c is a winding lead-out lead portion, and 2b is a portion near the implantation portion formed substantially parallel to the board mounting surface. Part, 4b is a connection part with the substrate, and 3b
Is an intermediate part connecting them. Also, the intermediate portion 3b
Is provided with steps 5b on both sides.

First, after winding the winding bobbin, in order to treat the winding end, first, the lead wire is wound around the portion 2b near the implanted portion of the gull wing type terminal 1b, and further the intermediate portion. Also wrap around 3b.

After that, the molten solder is dipped up to the position of d indicating the heat treatment depth shown in FIG. As a result, soldering is not applied to the portion near the planting portion, and the lead wire wound around the intermediate portion 3b is soldered.

As described above, the conventional soldering is performed up to the heat treatment depth e shown in FIG. 4, reacts with the solder up to the middle of the winding lead c, and in particular, the boundary between the portion that reacts with the solder and the portion that does not. Although disconnection was likely to occur in the vicinity, in the present embodiment, the boundary can be formed in the winding portion, and the concentration of stress on this portion can be avoided.

At the same time, as a result of providing such a step on the terminal, it is not necessary to make the winding machine perform a special operation.

(Embodiment 2) FIG. 3 is a view showing a winding terminal structure of a gull wing type terminal in the present embodiment 2. Figure 3
3A is a perspective view thereof, FIG. 3B is a plan view thereof, and FIG.
3C is a front view, and FIG. 3D is a right side view.

Further, an overall view of the winding bobbin having the gull wing type terminal of the second embodiment is as shown in FIG.

In FIG. 3A, 1a is a bobbin terminal implantation portion, 1b is a gull wing type terminal, c is a winding lead, and 2b is a portion near the implantation portion formed substantially parallel to the board mounting surface. 4b is a connecting part with the substrate, and 3b is an intermediate part connecting them. Further, a step 6b is provided on both sides of the intermediate portion 3b.

The step 6b is a step opposite to the left and right sides of the terminal. One of the steps has a shape for preventing the planted portion from shifting toward the root side, and the other step having a shape to prevent shifting toward the mounting side with the substrate.

First, after winding the winding bobbin, in order to treat the winding end, first, the lead wire is wound around the portion 2b near the implanted portion of the gull wing type terminal 1b, and then the intermediate portion. Also wrap around 3b.

After that, it is immersed in the molten liquid surface of the solder bath up to the position of d, which shows the heat treatment depth shown in FIG. As a result, soldering is not applied to the part near the planting part, and the intermediate part 3b
The winding end wound around is soldered.

As described above, the conventional soldering is performed up to the heat treatment depth e shown in FIG. 4, and in particular, the disconnection is likely to occur near the boundary between the portion that has reacted with the solder and the portion that does not.
In this embodiment, the boundary can be formed in the wound portion, and the occurrence of disconnection can be suppressed.

Further, as a result of providing the terminals with such steps which are opposite to each other, it is not necessary to cause the winding machine to perform a special operation.

As described above, according to the present invention, in the bobbin of the transformer / inductor intended for surface mounting, the winding position of the lead wire in the bobbin of the gull wing type terminal type having the terminal structure effective for downsizing and thinning is set. Conventionally, the lead wire is wound not only on the part where the lead wire has been wound and which is substantially parallel to the mounting substrate surface but also near the planting part, as well as the intermediate part.

In addition, heat treatment such as soldering, which is carried out in order to provide electrically stable electrical continuity between the terminal and the wound lead wire, includes the intermediate portion 3b, but near the planted portion of the terminal. Heat treatment depth d where soldering does not reach part 2b
By doing so, a heat element (such as solder erosion or destruction of the insulation coating) for the lead wire c leading up to the winding portion 2a of the bobbin from the lead wire wound around the portion 2b near the planted portion of the terminal is performed. ) It is possible to suppress problems such as wire breakage, which could be caused by deterioration in strength due to (1).

As a result, conventionally, in order to suppress the above-mentioned problems, the lead-out lead portion is folded back and a plurality of lead wires are stranded, and the heat treatment deteriorates the strength due to the heat treatment being performed up to the depth e. It is possible to avoid problems such as disconnection without performing an additional process to compensate.

Therefore, the number of working steps such as additional steps is unnecessary, the processing cost is low, and the equipment for the processing steps such as the twisting method is not necessary, so that the cost can be reduced.

Further, the terminal shape shown in FIG. 2 has the intermediate portion 3b.
The intermediate part 3b of the terminal so that the lead wire wound on the upper side or the lower side or both sides of the lead wire can be prevented from being misaligned.
Since the lead wire is wound around the intermediate portion 3b of the terminal, the lead winding can be prevented from being misaligned.

[0049]

Since the present invention is configured as described above, an additional step which has been conventionally carried out to prevent problems such as disconnection, that is, a lead portion in which a plurality of lead-out leads are folded back is provided. It is no longer necessary to twist the wires and compensate for the strength deterioration of the lead wires due to heat treatment.

Therefore, the number of working steps such as additional steps is unnecessary, the processing cost is low, and the equipment for the processing steps such as the twisting method is not necessary, so that the cost can be reduced.

Therefore, according to the present invention, there is provided a winding terminal processing method and a winding bobbin for manufacturing a winding component having a highly reliable terminal structure which prevents a defect such as a disconnection at low cost. be able to.

[Brief description of drawings]

FIG. 1 shows a gull wing type terminal and a winding terminal according to the present invention. FIG. 1A is a perspective view showing a winding structure of a gull wing type terminal and a lead wire according to an embodiment of the present invention. 1B is a plan view thereof, FIG. 1C is a front view thereof, and FIG. 1D is a right side view thereof.

FIG. 2 is a gull wing type terminal and a winding terminal according to the first embodiment. FIG. 2A is a perspective view showing a winding structure of the gull wing type terminal and the lead wire of the first embodiment. 2B is a plan view thereof, FIG. 2C is a front view thereof, and FIG. 2D is a right side view thereof.

FIG. 3 is a gull wing type terminal and a winding terminal according to the second embodiment. FIG. 3A is a perspective view showing a winding structure of a gull wing type terminal and a lead wire according to the second embodiment. 3 (b) is a plan view thereof, FIG. 3 (c) is a front view thereof, and FIG. 3 (d) is a right side view thereof.

FIG. 4 is an overall view of a winding bobbin having gull wing type terminals. 4A is a front view thereof, and FIG. 4B is a right side view thereof.

FIG. 5 is a conventional gull wing type terminal and winding terminal. Figure 5
(A) is a perspective view of a gull wing type terminal. FIG. 5B is a perspective view showing a conventional lead wire winding structure.

FIG. 6 is a winding bobbin having U-shaped terminals. 6A is a plan view thereof, FIG. 6B is a left side view thereof, and FIG. 6C is a front view thereof.

[Explanation of symbols]

1a Terminal part for bobbin 2a Winding part for bobbin 1b Gull wing type terminal 2b Part 3b near the part for planting Intermediate part 4b 2b and connection part 5b with substrate 5b Step difference (concave and convex shape) 6b of the terminal of Example 1 Step of terminal of Example 2 (uneven shape) 7b Terminal portion around which lead wire of U-shaped terminal bobbin is wound 8b Connection portion of terminal with U-shaped terminal bobbin substrate c Winding lead d d Lead wire and terminal Heat treatment depth e Conventional heat treatment depth of lead wire and terminal f Lead wire wound around conventional terminal g U-shaped terminal inside bobbin resin

Claims (4)

[Claims] 1. A part near a planting part, which is planted on a side surface of an insulating bobbin and is formed substantially parallel to a mounting board surface, a connecting part with the mounting board, and an intermediate part connecting the two parts. In a winding terminal treatment method for a winding component having a gull wing type terminal which is a terminal, a lead wire is wound around the terminal at a portion near the planting portion and the intermediate portion, and a wound lead wire is formed. A method for treating a winding terminal, wherein heat treatment such as soldering for electrically connecting the terminal is performed on the intermediate portion. 2. A winding bobbin to which the method for treating a winding terminal according to claim 1 is applied, wherein the lead wire wound around the intermediate portion is on the side of the terminal planting portion and the side of the connecting portion with the mounting board. The winding bobbin is characterized in that a convex portion or a concave portion is provided in the intermediate portion so as not to be displaced. 3. The convex portion or the concave portion provided in the intermediate portion is a step provided on both sides in the width direction of the terminal, and the terminal width on the side of the connection portion with the mounting substrate is equal to that of the planted portion. The winding bobbin according to claim 2, wherein the winding bobbin is narrower than the terminal width on the side. 4. The convex portion or the concave portion provided at the intermediate portion is a step provided on both sides in the width direction of the terminal, and the directions of the steps on both sides are opposite to each other as the terminal width increases or decreases. The winding bobbin according to claim 2, wherein the winding bobbin is provided as is.