JPH04216603A - Winding component and manufacture thereof - Google Patents

Abstract

PURPOSE:To avoid the manufacture of defective winding component due to the occurrence of shortcircuited winding by a method wherein protrusions are formed on the end of a pair of flanges formed on both ends of a core and then a pair of electrodes are formed on the end of the protrusions. CONSTITUTION:The core 1 used for the title winding component is composed of a core part 11 and the flange parts 4, 4 on both ends of the core parts 11. At this time, two protrusions 9, 9 are formed in parallel with each other in the vertical direction on the end of the flanges 4, 4 while a pair of electrodes 8a, 8b are formed respectively on the end of the protrusions 9, 9. Accordingly, the temperature rise inside the flange parts 4, 4 and the winding 3 side wound around the core part 11 during the soldering step can be restrained thereby minimizing the occurrence of defective shorticrcuit. In such a constitution, the high reliability upon the transformer product can be assured due to the least deterioration in the winding film.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-wound component such as a transformer, which is constructed by winding a wire around a drum-shaped core, and a method for manufacturing the same.

0002

[Prior Art] Conventionally, the core of a wire-wound component such as a transformer that is surface-mounted on a board has a shape as shown in FIG. 5, for example. It has the configuration as shown. In FIG. 5, reference numeral 1 denotes a drum-shaped core for a wire-wound component, which is composed of a winding core 11 and flanges 4, 4 at both ends thereof. On the end faces of the flange parts 4, 4, a pair of external connection electrodes 8a, 8b (
In FIG. 5, the electrode on one flange portion is hidden in the shadow and cannot be seen. ) are formed respectively. Moreover, there is a pair of parallel parts on the edge, and two notches 5, 5 are formed in each of the parallel parts.

As shown in FIG. 4, the winding core 1 of the core 1
1 is wound with a winding 3 made of an insulated conductor. The winding 3 consists of a primary winding and a secondary winding. For example, the primary winding is wound around the winding core 11 of the winding component core 1, and the secondary winding is wound thereon. . In the figure, the primary winding is wound on the lower side and the secondary winding is wound on the upper side, so the primary winding is not visible, but these may be wound in the reverse order. The lead wires 10, 10 of these windings 3 are passed through the notches 5, 5 of the flange parts 4, 4 of the core 1, and are drawn out to the end faces of the flange parts 4, 4, where they are respectively connected. The electrodes 8a and 8b of the flange portion 4 are conductively fixed with solder 6.

During this soldering, the insulation coating of the lead wires 10, 10 of the primary and secondary windings 2, 3 is removed, but in order to facilitate the removal of this insulation coating, hot melting is usually A conductive wire coated with a transparent insulating coating is used. As shown in FIG. 6, with the tips of the lead wires 10, 10 of the winding 3 attached to the electrodes 8a, 8b on the end face of the flange part 4, the end face of the flange part 4 is soldered with melted solder. 6', the insulating coating of the lead wire 10 is melted by the heat of the molten solder 6', and the heat is further dissipated and removed, and at the same time, the tip of the lead wire 10 is soldered to the electrodes 8a, 8b. Was.

[0005]

[Problems to be Solved by the Invention] However, in the soldering process as described above, the molten solder 6' is at a considerably high temperature, and this heat passes through the thin flange part 4 and is wound around the core part 11. It also extends to winding 3. For this reason, winding 3
Part of the insulating resin coating may melt. In this case, for example, in a component having primary and secondary windings as described above, the lead wire 10 of the primary winding wound below the winding core 11 is attached to the inner side surface of the flange 4. These lead wires 1 are led out to the outside of the outer winding 3 along the
0 and the upper winding, that is, the secondary winding, intersect and are in contact with each other. As a result, the heat generated when the lead wire 10 is soldered to the electrodes 8a and 8b melts the insulation coating at the intersection, resulting in a short circuit between the primary winding and the secondary winding. This causes poor insulation of the winding components. An object of the present invention is to solve the above-mentioned problems by soldering the lead wire 10 of the winding 3 to the electrodes 8a and 8b, and the flange 4 of the core 1.
To provide a winding component and a method for manufacturing the same, in which heat hardly reaches the winding 3 side wound on the winding core part 11 side of the core 1 through 4, and short circuits due to melting of the insulating resin coating of the winding 3 are hard to occur. It is in.

[0006]

[Means for Solving the Problems] That is, in the present invention, in order to achieve the above object, electrodes 8a, 8b are provided on the end faces of a pair of brim-like flanges 4, 4 formed at both ends of the winding core 11.
It has a core 1 formed with a winding 3 and a winding 3 wound around the core 11 of the core 1, and lead wires 10, 10 of the winding 3.
is pulled out to the end surface side of the flange portions 4, 4, and the electrode 8a
, 8b, protrusions 9, 9 are formed on the end faces of the flanges 4, 4, and the protrusions 9,
The present invention provides a winding component characterized in that the electrodes 8a, 8a are formed on the end face of the wire.

Furthermore, a core 1 is prepared in which electrodes 8a, 8b are formed on the end faces of a pair of flanges 4, 4 formed at both ends of the winding core 11, and the winding core of the core 1 is 11
The winding 3 is wound around the winding 3, the lead wires 10, 10 of the winding 3 are pulled out to the end faces of the flange parts 4, 4, and the tips thereof are soldered to the electrodes 8a, 8b to manufacture a winding component. In the method, a core 1 is used in which convex portions 9, 9 are formed on the end surfaces of the flange portions 4, 4, and the electrodes 8a, 8a are formed on the end surfaces of the convex portions 9, 9, and the winding 3 is With the tip of the leader wire 10 attached to the electrodes 8a, 8a, the flange portion 4,
To provide a method for manufacturing a wire-wound component, characterized in that only the portions of the convex portions 9, 9 near the end surfaces of the wires 10, 10 are dipped in solder, and the lead wires 10, 10 are soldered to the electrodes 8a, 8b.

[0008]

[Operation] In the above-described wire-wound parts and manufacturing method thereof, only the portions of the flange portions 4, 4 near the end faces of the protrusions 9, 9 are immersed in the molten solder 6', and the parts formed on the end faces of the protrusions 9, 9 are immersed in the molten solder 6'. electrode 8a
, 8b, the heat of the molten solder 6' is unlikely to reach the side of the winding 3 wound around the winding core 11 via the flange 4. Therefore, the insulation coating of the winding 3 is less likely to be lost, and a situation where the winding 3 is short-circuited can be prevented.

[0009]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 2, reference numeral 1 is an example of a core used in the winding component according to the present invention, which is composed of a winding core 11 and flange parts 4, 4 at both ends of the winding core 11. On the end faces of the flange parts 4, 4, two convex parts 9, 9 are formed in parallel across the longitudinal direction of the flange part 4, and on the end faces, a pair of electrodes 8a, 8b (in FIGS. 1 and 2, The electrodes on one flange portion 4 are hidden in the shadow and cannot be seen.) are formed. In addition, each flange portion 4,
The upper and lower edges of 4 are formed parallel to each other, and cutouts 5, 5 are formed on both sides of these edges.

Core 1 for wire-wound parts having such a configuration
As shown in FIG. 1, a primary winding, for example, is wound around the winding core 11 as the winding 3, and a secondary winding is further wound on the primary winding. The lead wires 10 of these windings 3 are led out to the end surfaces of the flange parts 4, 4 through the notches 5, 5 of the flange parts 4, 4, where the lead wires 1
Electrodes 8a, 8 whose tips of 0 are formed on the end surfaces of the convex parts 9, 9
It is served with b. Then, as shown in FIG. 3, a portion of the convex portions 9 on the end surface of one flange portion 4 near the end surface is immersed in the molten solder 6' and pulled up to form an electrode 8a, The tip of the leader wire 10 is connected to 8b with solder 6. The soldering process by dipping into the molten solder 6' is performed sequentially on the flange portions 4, 4 at both ends.

A transformer as shown in FIG. 4 using a conventionally shaped core 1 as shown in FIG. 5 in which the flange portions 4, 4 have a thickness of 0.6 mm, and a transformer as shown in FIG. For a transformer as shown in Fig. 1 using a core 1 as shown in Fig. 2 with convex portions 9, 9 of 0.3 mm in diameter, the lead wire 10 of the winding 3 was actually soldered, and the result at that time was The temperature measurement results are shown in FIG. That is, in FIG. 7, thermocouples are installed inside the flange parts 4, 4 of these transformers to measure the temperature, and these are measured by melting solder 6' at 380°C as shown in FIGS. 6 and 3, respectively. When immersed in for 3 seconds,
It is a graph showing the relationship between immersion time and temperature. In addition,
In this case, the immersion depth of the molten solder 6' from the end face of the flange portion 4 or the end face of the convex portions 9, 9 was 0.2 mm.

Furthermore, as a reference example, a transformer having the same structure as the conventional one is used, except that a so-called thick-flange core is used, in which the thickness of the flange portion 4 is 1.5 times (0.9 mm) as that of the conventional core 1. FIG. 7 shows the relationship between immersion time and temperature when immersed in molten solder 6' in the same manner. ■As is clear from Figure 7, the temperature rise inside the flange portion 4 when immersed in molten solder 6' at 380°C for 3 seconds was 244°C for the transformer using the conventionally shaped core, and 244°C for the transformer using the thick-flaged core. 2 in the trance
Although the temperature was 26°C, as in the embodiment of the present invention, the convex portions 9,
In a transformer using a core with 9, the temperature was 200°C.

[0013] Furthermore, each of the 100 transformers is
A reliability test was conducted by soldering and manufacturing under the above conditions and placing these in a constant temperature bath set at 150° C. for 1000 hours, measuring the inductance and comparing the incidence of short circuit defects. As a result, after leaving the transformers in a thermostat at 150°C for 1000 hours, the number of short-circuit failures was 3 out of 100 for transformers using conventional core 1, and 1 out of 100 for transformers using thick-flailed cores. Although it occurred, the convex part 9
, 9 in the transformer according to the embodiment of the present invention, no short-circuit failure occurred in even one out of 100 transformers.

From these results, the chip transformer of the present invention has an excellent effect of suppressing the temperature rise inside the flange portion 4 of the core 1 during the soldering process, that is, on the side of the winding 3 wound around the winding core 11. Therefore, it can be understood that the occurrence of short circuit defects is reduced. It can also be seen that even in the finished transformer product, high reliability can be obtained because the deterioration of the winding coating is small.

In the conventional core 1, the electrodes 8a and 8b were formed by screen-printing a conductive paste on the end face of the flange portion 4 and baking it, but in the core 1 of the wire-wound component of the present invention, the electrodes Since the end face portions of the convex portions 9, 9 forming the convex portions 8a, 8b protrude from the other portions, the electrodes 8a, 8b can be formed by simply pressing the core convex portions onto electrode paste spread thinly on a flat surface, for example. conductive paste can be applied, the process of printing the electrodes 8a and 8b becomes simple, and the efficiency of the process can also be improved.

[0014]

As is clear from the above description, according to the present invention, it is possible to prevent defects in winding components due to occurrence of short circuits in the windings, and it is possible to obtain winding components with high reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a winding component showing an embodiment of the present invention.

FIG. 2 is a perspective view of a core used in the winding component of the same embodiment.

FIG. 3 is a side view showing a step of immersing a part of the winding component in molten solder and soldering the lead wire of the winding to the electrode on the end face of the flange.

FIG. 4 is a perspective view of a winding component showing a conventional example.

FIG. 5 is a perspective view of a core used in the conventional winding component.

FIG. 6 is a side view showing a step of immersing a part of the winding component in molten solder and soldering the lead wire of the winding to the electrode on the end face of the flange.

FIG. 7 is a graph showing the relationship between the immersion time and the temperature inside the flange when a part of the winding part according to the embodiment of the present invention and a part of the winding part according to the conventional example are immersed in molten solder.

[Explanation of symbols]

1 Core 3 Winding wire ４　　　　Flange part of the core 6 Solder 6’ Molten solder 8a　　　Electrode 8b Electrode 9 Convex part 10 Winding wire extraction part 11 Core winding core

Claims (2)

[Claims] 1. A core 1 in which electrodes 8a and 8b are formed on the end faces of a pair of brim-like flanges 4 and 4 formed at both ends of the core 11, and the core 11 of the core 1. The lead wires 10, 10 of the winding wire 3 are drawn out to the end face side of the flange parts 4, 4, and the electrodes 8a, 8b are wound.
In the winding component soldered to the flange portion 4
, 4 are formed with protrusions 9, 9, and the electrodes 8a, 8a are formed on the end faces of the protrusions 9, 9. 2. A core 1 in which electrodes 8a, 8b are formed on the end faces of a pair of brim-like flanges 4, 4 formed at both ends of a winding core 11 is prepared, and the winding core of the core 1 is The winding 3 is wound around the coil 11, and the lead wires 10, 10 of the winding 3 are drawn out to the end surfaces of the flange parts 4, 4, and the tips thereof are connected to the electrodes 8a.
, 8b, in which convex portions 9, 9 are formed on the end surfaces of the flange portions 4, 4, and the electrodes 8a, 8a are formed on the end surfaces of the convex portions 9, 9. Using the core 1 shown in FIG. A method for manufacturing a wire-wound component, which comprises soldering the lead wires 10, 10 to the electrodes 8a, 8b by immersion.