JPH01302809A - Electromagnetic device for board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electromagnetic device for a printed circuit board that is attached to a printed circuit board.

BACKGROUND OF THE INVENTION Conventionally, the structure of a transformer, which is a type of electromagnetic device attached to a printed circuit board (not shown), is as follows.

As shown in FIG. 7, a secondary coil 4 and a secondary coil 5 are generally wound around core parts 2 and 3 of an annular magnetic body 1. Further, such a transformer is attached to a printed wiring board using an adhesive or a mounting metal fitting. In addition,
The tips of the coils 4 and 5 are inserted into substrate holes formed in the printed wiring board and are soldered to conductive foil formed on the printed wiring board.

Problems to be Solved by the Invention The work of winding the coils 4 and 5 around the core parts 2 and 3 is done manually because the number of windings is small, which is time-consuming. Furthermore, after winding the coils 4 and 5 around the core parts 2 and 3 and assembling the transformer, it is necessary to attach the transformer to the printed wiring board.

It's time consuming.

Means for Solving the Problems A plurality of conductive members formed in a substantially U-shape and a support body for holding these conductive members are provided, and a pair of legs of the conductive member are positioned on both sides of the magnetic body. At the same time, the support body is attached to the magnetic body, the magnetic body is placed on one surface of the printed wiring board, and the leg portions are inserted into the board holes formed in the printed wiring board, and the support body is mounted on the other surface of the printed wiring board. A plurality of conductive foils were formed, and these conductive foils and the tips of the legs were connected by soldering to form a coil around the magnetic material using the conductive member and the conductive foils.

The support body holding the working conductive member is attached to the magnetic body, the legs of the conductive member are inserted into the board holes of the printed wiring board, and the ends of the legs of the conductive member are soldered to the conductive foil formed on the printed wiring board. By attaching and connecting the conductive member and the conductive foil, a coil around which the magnetic material is wound is formed.

Embodiment A first embodiment of the present invention will be explained based on FIGS. 1 to 4. First, there is a ring-shaped magnetic body 8 which is a magnetic body having a pair of core parts 6 and 7 and formed into a mouth shape, and a ring-shaped magnetic body 8 having a pair of core parts 6 and 7 and having four parts 9 fitted into each of the core parts 6 and 7 and formed into a substantially U-shape. A pair of support bodies 10.11 are provided. The support body 10.11 is made of an insulating synthetic resin, and the depth dimension 6b of the recess 9 is equal to the thickness dimension a of the annular magnetic body 8.
is set to satisfy a≧b.

The support body 10.11 also includes this support body 1.
0.11 in the thickness direction and are arranged in two rows on both sides of the recess 9 at equal intervals. Next, a plurality of coil pins 13 which are conductive members bent into a 1113U shape are provided, and these coil pins 13 are connected to one leg 14.
is inserted into the pin hole 12, and the other leg portion 14 is inserted into the other pin hole 12 facing the recess 9 between them.

Next, a printed wiring board 15 made of an insulating material is provided, and this printed wiring board 15 is a multi-value board into which the legs 14 of the coil pins 13 held by the support body 10 are inserted. hole 16 and the support body 11
A plurality of substrate holes 17 are formed into which the legs 14 of the coil pin 13 held by the coil pin 13 are inserted. Further, on the back surface of the printed wiring board 15, a first conductive foil group 19 in which a plurality of conductive foils 18 are formed in parallel, and a second conductive foil group 20 in which a plurality of conductive foils 18 are similarly formed in parallel. At the end of the conductor 1518 in the first conductive foil group 19, holes are formed that are continuous with the board holes 16, and these holes have legs of the coil pins 13. The tip of section 14 is inserted and soldered. Also,
As shown in FIG. 4, one leg 14 of one coil pin 13 is connected to one end of one conductive foil 18, and the other leg 14 of this coil pin 13 is connected to the other end of an adjacent separate conductive foil 18. It is connected to the. By continuing such a connection state, the coil pin 13 and the conductive foil 18 form a primary coil 21 that is a coil wound around the core portion 6. In addition,
Conductive foils 1 located at both ends of the first conductive foil group 19
8a is a conductive foil for a terminal connected to a power supply circuit (not shown), and the leg 1 of the coil pin 13 is connected only to one end.
4 is connected.

The second conductive foil group 20 has substantially the same structure as the first conductive foil group 19, and differs only in the number of conductive foils 18. A secondary coil 22, which is a coil wound around the core portion 7, is formed by sequentially connecting the coil pin 13, conductors g, and ff11s. Note that the conductive foils 18b located at both ends of the second conductive foil group 2o are conductive foils for terminals connected to an external circuit (not shown).
The leg portion 14 of the coil pin 13 is connected only to one end.

In such a configuration, the assembly work will first be explained. The legs 14 of the coil pins 13 are inserted into the pin holes 12 of the support bodies 10.11, and these support bodies 10.
The recess 9 of No. 11 is inserted into the core portion 6°7. Next, the annular magnetic body 8 with the support body 10.11 attached thereto is placed on the front side of the printed wiring board 15, and the legs 14 of the coil pins 13 are inserted into the board holes 16.17.
Solder the conductive foil 18 on the back side of the . Then.

A coil 21 is formed by the conductive foil 18 of the first conductive foil group 19 and the coil pin 13, and a secondary coil 22 is formed by the conductive foil 118 and the coil pin 13 of the second conductive foil group 20. Therefore, since the transformer can be assembled and attached to the printed wiring board 15 at the same time,
The number of assembly steps is reduced.

In particular, the work of winding the secondary coil 21 and the secondary coil 22 is no longer necessary, and the work effort is significantly reduced.

Furthermore, by soldering the legs 14 of the coil pins 13, the attachment of the annular magnetic body 8 and the support bodies 10 and 11 to the printed wiring board 15 is stabilized, and the quality of the product is improved.

Here, the assembly work of inserting the leg portions 14 of the coil pin 13 into the board holes 16 and 17 of the printed wiring board 15 is performed by a component inserter, and the soldering of the leg portions 14 of the coil pin 13 and the conductive foil 18 is performed. This is done using a flow soldering device. These component inserters and flow soldering machines are already existing equipment in factories that manufacture electromagnetic devices such as transformers, so even if the present invention is adopted through design changes, no new equipment investment is required.

Next, a second embodiment of the present invention will be explained based on FIG. In addition, the same parts as those explained in FIGS. 1 to 4 are indicated by the same reference numerals, and the explanation will be omitted (the same applies hereinafter). In this embodiment, a plurality of grooves 23 for attaching the coil pins 13 are formed on the upper end surface of the support body 10.11. By forming this groove 23, the mounting condition of the coil pin 13 is stabilized, and interference of the coil pin 13 with other parts is prevented. moreover.

By inserting an insulating adhesive into the groove 23, the coil pin 13 can be attached more stably.

Next, a third embodiment of the present invention will be described based on FIG. 6. In this embodiment, the support body 24 that holds the coil pin 13 is formed into a plate shape. A positioning protrusion 25 is formed on the lower surface of this plate-shaped support body 24 for use in attaching it to the core portion 6°7. In addition, this support body 2
4, it is also possible to form a long support body 24 as shown by the dashed line and attach the coil pin 13, and then cut the support body 24 to the required length. can. In addition, by forming the support body 24 from a flexible material such as nylon and making the tip of the coil pin 13 sharp, it is not necessary to form a pin hole 12 for attaching the coil pin 13, thereby reducing the number of manufacturing steps. can be achieved.

In the first to third embodiments, the coil pin 13 having a circular cross-sectional shape is used as the conductive member, but a plate-like member having a rectangular cross-sectional shape may also be used.

Effects of the Invention Since the present invention is configured as described above, the support body holding the conductive member is attached to the magnetic body, and then the tip of the conductive member is inserted into the board hole formed in the printed wiring board, and the conductive foil is inserted into the substrate hole. By soldering the electromagnetic device to the printed wiring board, it is possible to assemble the electromagnetic device and attach it to the printed wiring board at the same time.Moreover, it is possible to eliminate the time-consuming work of winding the coil, thus reducing the number of assembly steps. In addition, the mounting of electromagnetic devices on printed wiring boards can be ensured and the quality of products can be improved.
In addition, the component insertion machines, flow soldering devices, etc. used during assembly work are existing equipment in each factory that manufactures electromagnetic devices, so even if the present invention is adopted by changing the design, no new capital investment is required. This has advantages such as being able to reduce costs due to the slackness.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the first embodiment of the present invention;
The figure is a perspective view showing the assembled state, FIG. 3 is a sectional view taken along the line A-A in FIG. 2, and FIG. 4 is a bottom view of the printed wiring board illustrating the arrangement of conductive foil. FIG. 5 is a vertical sectional side view showing the second embodiment of the present invention, and FIG.
The figure is a perspective view showing a support in a third embodiment of the present invention, and FIG. 7 is a perspective view showing a conventional example. 8...Magnetic material, 10.11...Support body, 13.
... Conductive member, 14... Leg portion, 15... Printed wiring board, 16.17... Board hole, 18... Conductive foil, 21
．． 22...Coil, 24...Support body Applicant: Tokyo Electric Co., Ltd., J, Figure 1'' 3 J Print Figure i5

Claims (1)

[Claims] A plurality of conductive members formed in a substantially U-shape and a support body holding these conductive members are provided, a pair of legs of the conductive member are positioned on both sides of the magnetic body, and the support body is connected to the magnetic body. and placing the magnetic body on one surface of the printed wiring board, inserting the leg portions into board holes formed in the printed wiring board, and forming a plurality of conductive foils on the other surface of the printed wiring board. An electromagnetic device for a board, characterized in that these conductive foils and the tips of the legs are connected by soldering, and the conductive member and the conductive foil form a coil around which the magnetic material is wound.