JPH03230507A - Manufacture of inductor element and its fitting method - Google Patents

Abstract

PURPOSE:To stabilize the mounting onto an electrode land, by flatly forming the end portion of a coil main body, simultaneously eliminating a covering part, dipping the end portion in a low temperature melting solder vessel, and finishing soldering. CONSTITUTION:The tips of terminal parts 3, i.e., the start-of-winding and the end-of-winding, of a coil main body 1 are bent so as to be parallel to the winding axis direction, and a flat part 4 is formed by mechanical pressing. At the time of pressing, a coating film at this part is broken into pieces and removed from the terminal parts 3. As a result it is unnecessitated to eliminate a coating part by heating it at a high temperature, so that the end portion 3 can be completely soldered only by dipping it in a low temperature melting solder vessel. Hence the coil main body can be stably retained on an electrode lands 7, and the temperature of the solder vessel can be decreased, so that oxidation is slow and further the temperature management is simplified. Thereby the stable mounting onto an electrode land is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing and a method of attaching an inductor element to be attached to an electrode land of a wiring pattern without through holes in a printed wiring board.

[Conventional technology]

A conventional example will be explained with reference to FIGS. 4 and 5. FIG. 4 is an explanatory diagram of an inductor element in a conventional example, and FIG. 5 is an explanatory diagram of an inductor element mounting structure in a conventional example.

In FIGS. 4 and 5, a coated conductive wire 12 coated with polyurethane resin is wound a predetermined number of turns by an automatic winding machine (not shown) to form a coil body 11, and is cut leaving a terminal portion 13. and constitutes an inductor element. The terminal portion 13 is connected to a high temperature melting solder tank (for example, 3
00 to 350 degrees), the polyurethane resin coating formed on the terminal portion 13 is burned away by the high temperature. At the same time, the conductive wire portion of the terminal portion 13 is soldered to form a soldered portion (not shown).

The terminal portion 13 of the inductor element formed as described above is placed on the electrode land 15 of the printed wiring board 14 on which cream solder is placed by a mounter (not shown). Then, by performing a reflow soldering process, the terminal portion 13 of the inductor element and the printed wiring board 1 are bonded.
No. 4 electrode land 15 is connected.

[Problem to be solved by the invention]

However, in the conventional example described above, it is difficult to always fix the coil body 11 in the correct posture when placing the terminal portion 13 of the inductor element on the electrode land 15 on which cream solder is placed. That is, compared to the volume of the coil body 11, the terminal portion 13 that supports it is a thin wire, so the coil body 11 may be tilted or placed out of position due to slight vibrations or how the mounter is attached. be done.

Therefore, the inductor element mounted as described above may come into contact with other chip components or cause a connection failure with the electrode land 15.

In addition, in order to burn out the coating of the covered conductor 12, the terminal part 13 is inserted into a high temperature molten solder tank (for example, 300 to 350 degrees) and soldered. The temperature must be higher than the temperature used. As a result, not only the solder in the molten solder bath is oxidized quickly, but also the temperature control of the solder becomes troublesome.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a method for manufacturing and a method for attaching an inductor element that can be stably mounted on an electrode land through simple mechanical processing.

[Means to solve the problem]

In order to achieve the above object, the method for manufacturing an inductor element of the present invention includes a first step of winding a covered conductor wire to form an inductor element composed of a coil body and a terminal portion, and a terminal portion of the coil body. It consists of a second step in which the coating is removed at the same time as the end portion is formed flat, and a third step in which the end portion formed flat in the second step is soldered by immersing it in a low-temperature melting solder bath.

Also, a first step of winding a coated conductive wire to form an inductor element consisting of a coil body and a terminal portion, and a second step of bending the terminal portion to form a bent portion that increases the surface area for the electrode land. , and a third step of immersing the terminal portion formed in the second step in a high-temperature molten solder tank to solder it.

Furthermore, a first step of placing cream solder on the printed wiring board, a second step of bonding the terminal portion of the inductor element obtained in the manufacturing method with the cream solder placed on the electrode land, and The system consists of a third step of performing reflow soldering to connect the element and the electrode land of the printed wiring board.The terminal part of the coil body wound by the automatic winding machine
It is mechanically pressed and flattened. This flat portion with increased area stably supports the coil body on the electrode land. Furthermore, when the terminal section is mechanically pressed, the insulating film covering the terminal section is broken into pieces, separated from the terminal section, and falls. Therefore, the temperature of the molten solder bath for soldering can be kept low.
Not only is solder oxidation slow, but temperature control is easy.

Furthermore, if the terminal portion is bent multiple times along the electrode land to make the area of that portion apparently larger, the coil body can be easily placed upright on the electrode land.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an explanatory diagram of an inductor element according to the present invention, and is a view of the inductor element viewed from above.

In FIG. 1, a coated conductive wire 2 coated with polyurethane resin is wound a predetermined number of turns by an automatic winding machine (not shown) to form a coil body 1. As shown in FIG.

The terminal portion 3, which is the beginning and end of winding of the coil body 1, is
The tip is bent so as to be parallel to the winding axis direction of the coil body 1. Thereafter, the bent end portion 3 is mechanically pressed to form a flat portion 4. The mechanical compression can be achieved by simply tapping with a flat mold. When the terminal portion 3 is pressed, the film in this portion becomes pulverized and detached from the terminal portion 3.

Therefore, there is no need to burn out the coating at a high temperature, so the terminal part 3 can be heated to a temperature of 23°C instead of a high-temperature melting solder bath (for example, 300 to 350 degrees) for soldering.
Just immerse it in a molten solder tank at about 0 degrees Celsius and it will be soldered (not shown).

Further, FIG. 2 is an explanatory diagram of another inductor element according to the present invention, and is a view of the inductor element viewed from above.

The difference in FIG. 2 from the inductor element shown in FIG. 1 is that the terminal portion 3 is bent to form a bent portion 5. The number of bends varies depending on the wire diameter, and is performed as necessary to form the coil body 1 so that it is stably supported.

The inductor element formed as described above has a third
As shown in the figure, it is temporarily attached using cream solder placed on the electrode land 7 provided on the printed wiring board 6.

After that, by reflow soldering, the flat part 4 or the bent part 5 of the terminal part 3 and the electrode land 7 of the printed wiring board 6 are bonded.
are soldered.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made without departing from the scope of the invention as set forth in the claims.

For example, in the embodiment, the coil is described as an air-core coil, but it may optionally be a cored coil containing ferrite or the like, or an inductor element such as a variable coil.

Further, the angle at which the terminal portion is bent in the horizontal direction can be in any direction on either the left or right sides.

Further, the shape of the terminal portion is not limited to being bent, but may be any shape such as a spiral shape as long as the connection area is increased.

〔Effect of the invention〕

According to the present invention, the terminal portion of the coil body is formed by being bent horizontally and mechanically pressed to increase its area, so that the coil body is stably supported by the electrode land. . At the same time, the coating on the terminal part is removed,
Since there is no need to burn it out at high temperatures, the temperature of the molten solder bath can be lowered.

Further, according to the present invention, since the area of the terminal portion of the coil main body can be increased arbitrarily by bending, the coil main body can be stably mounted on the electrode land of the printed wiring board using a mounter.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an inductor element according to the present invention, FIG. 2 is an explanatory diagram of another inductor element according to the present invention, FIG. 3 is an explanatory diagram of an inductor element mounting structure according to the present invention, and FIG. 4 is an explanatory diagram of an inductor element in a conventional example. 5 are explanatory diagrams of an inductor element mounting structure in a conventional example. 1... Coil body 2... Covered conducting wire: 3... Terminal part 4... Flat part 5... Bent part 6... Printed wiring board 7... Electrode land L... Inductor element Inductor element explanatory diagram 11i in the present invention! 5 Illustration of another inductor element in the present invention Figure 2 Illustration of an inductor element mounting structure in the present invention Third
N

Claims (3)

[Claims] (1) A first step of winding the coated conductor wire 2 to form an inductor element L composed of the coil body 1 and the terminal portion 3, and forming the terminal portion 3 of the coil body 1 into a flat shape and simultaneously removing the coating. A method for manufacturing an inductor element, comprising: a second step; and a third step of soldering the terminal portion 3 formed flat in the second step by immersing it in a low-temperature melting solder bath. (2) A first step of winding the covered conductor 2 to form an inductor element L composed of a coil body 1 and a terminal portion 3; and a bending portion of bending the terminal portion 3 to increase the surface area relative to the electrode land 7. 5; and a third step, in which the terminal portion 3 formed in the second step is soaked in a high-temperature molten solder tank and soldered. (3) a first step of placing cream solder on the electrode lands 7 of the printed wiring board 6; A second step of bonding with cream solder placed on the electrode land 7, and a third step of performing a reflow soldering process to connect the inductor element L and the electrode land 7 of the printed wiring board 6. Features: How to install inductor elements.