JPS6129106A - Small-sized coil - Google Patents

Abstract

PURPOSE:To prevent paste solder from dropping by providing a slit at the terminal and increasing the surface area of the terminal, thereby increasing the adhesion of the paste solder. CONSTITUTION:Two parallel terminal grooves 11, 12 are formed on the outside of one collar 10a of a drum-shaped core. Terminals 13, 14 which respectively have stators 13a, 14a, tapered and horizontal parts 13c, 14c, slits 13d, 14d are associated with and bonded to the grooves 11, 12. A coil 15 is wound on a drum- shaped core, coil leads 15a, 15b are wound and soldered onto the tapered part of the terminals 13, 14. Further, the core and the tapered parts of the terminals 13, 14 are molded with resin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a small coil used in various electronic devices.

Conventional structure and its problems Conventional small coils have been constructed as shown in FIGS. 1 to 6. That is, a terminal groove 2.3 into which the terminals 4 and 6 are inserted and connected is provided in one of the flanges 1a of a drum-shaped core 1 having flanges 1a and 1b at both ends, and a fixing portion of the terminals 4 and 5 is provided in this terminal groove 2.3. 4a and 5a are inserted and fixed with adhesive, etc., and a coil 6 is wound around this drum-shaped core 1, and coil leads 6a and 6 are placed at the beginning and end of winding of this coil e.
b is wound around the tapered portion 4b and esb of the terminal 4.6 and connected with solder to form the horizontal portion 4c of the terminal 4,6.

An exterior 7 made of resin was applied to 5C so as to protrude outward, and the structure was constructed as shown in Fig. 6.

When a conventional small coil is reflow soldered with paste solder 9 or the like on a printed circuit board 8 as shown in FIG. 6, especially when mounted on the back side of a double-sided circuit board,
There was a problem that the coil could not be held by the viscosity of the paste-like solder 9 due to its own weight and would fall.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a small-sized coil that can be easily mounted on a printed circuit board, which is a disadvantage of the conventional method.

Structure of the Invention In order to achieve the above object, the small coil of the present invention has two terminal grooves provided on the outer surface of one of the flanges of a drum-shaped core having flanges at both ends, and a coil that is fitted into the terminal groove. A fixed part to be adhesively bonded, a tapered part rising from this fixed part, and a terminal having a slit in a horizontal part protruding outward at the tip of this tapered part are attached to the drum-shaped core, and The coil lead of the coil wound around the mold core is connected to the tapered part of the terminal, and the drum-shaped core and the tapered part of the terminal are molded with a resin exterior, and I>D, this configuration is adopted. As a result, the mounting on the printed circuit board can be performed stably without falling due to the viscosity of the solder paste.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 7 to 11 of the drawings.

As shown in FIG. 7, 10 has brim 10a at both ends.

The drum-shaped core 10 has two parallel terminal grooves 11 and 12 formed on the outer surface of one collar 10a. This terminal groove 11.1
2 includes fixing parts 13a and 14a that are fitted into the terminal grooves 11 and 12 and are coupled with adhesive or the like;
Tapered portions 13b, 14 rising from one end of 3a, 14a
b, horizontal portions 13c and 14c protruding outward from the tips of the tapered portions 13b and 14b, and the horizontal portion 13c.

Terminals 13.14, which are constructed by providing slits 13d and 14d in 14C, are incorporated and coupled.

The drum-shaped core 1o has a coil 1 as shown in FIG.
6 is wound, and the coil leads 15a and 15b at the beginning and end of winding of this coil 16 are connected to the tapered part 1 of the terminal 13°14.
3b and 14b and are connected by soldering.

As another embodiment, as shown in FIG. 9, a fixing portion 13a is fitted into a terminal groove 11.12 of a drum-shaped core 1o and bonded with an adhesive or the like.

14a, and tapered portions 13b and 14b rising from one end of the fixing portions 13a and 14a, and the tapered portions 13b and 14a.
Horizontal parts 13c, 14c protrude outward from the tips of 4b, and slots 13d, 14a in these horizontal parts 13c, 14c.
Terminals 13 and 14 configured with
5a.

15b may be wound and connected by soldering. As shown in Fig. 1Q, a small coil is constructed by applying an outer device 6 of resin so that the horizontal portions 13c and 14c of the terminals 13 and 14 protrude outward, as shown in Fig. 1Q.
Slit portion 13d.

14d, when performing slow flow soldering such as printing paste solder 18 on the printed circuit board 17 as shown in FIG. , 14d increases the surface area and thereby increases the adhesiveness.

Effects of the Invention As described above, the small coil of the present invention has the drawback of the conventional method of holding the product using the viscosity of the paste-like solder on the printed circuit board. However, by providing slits in the terminals and increasing the surface area of the terminals, the adhesiveness of the paste solder also increases, eliminating the possibility of the solder falling off and making it easier to mass-produce. In terms of cost, there is no deterioration factor compared to conventional ones, there is no deterioration in reliability, there are improved advantages in terms of quality, and it is of great industrial value.

[Brief Description of the Drawings] Figures 1 to 3 are perspective views of a conventional small coil in the process of being assembled, Figure 4 is a sectional view of the same exterior being formed, and Figure 5 is a perspective view of a conventional small coil. Fig. 6 is a front view showing how a conventional small coil is mounted on a printed circuit board, Fig. 7 is an exploded perspective view of main parts showing an embodiment of the small coil of the present invention, and Fig. 8 is a front view of the small coil according to the present invention. Fig. 9 is an exploded perspective view of the main parts of a small-sized filter according to another embodiment, Fig. 10 is a perspective view of the same small-sized coil, and Fig. 11 shows the state in which the same small-sized coil is attached to a printed circuit board. It is a front view. 1o...Drum-shaped core, 10a, 10b...
...Brim, 11.12...Terminal groove, 13.14
...Terminal, 13a, 14a...Fixed part, 13b, 14b...Tapered part, 13c, 14
c, ...horizontal part, 13d. 14d...Slit portion, 15...Coil, 15a. 15b...Coil lead, 16...Exterior,
17...Printed circuit board, 18...Paste solder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 5 Figure 9 Figure 11 Figure 17

Claims (1)

[Claims] Two terminal grooves are provided on the outer surface of one of the flanges of a drum-shaped core that has flanges at both ends, and a fixed part is fitted into the terminal groove and bonded with adhesive, and a tapered part rises from this fixed part. A terminal having an outwardly protruding horizontal portion at the tip of the tapered portion and a slit provided in this horizontal portion is attached to the drum-shaped core, and the coil lead of the coil wound around the drum-shaped core is attached to the drum-shaped core. A small coil that is connected to the terminal taper part, and the drum-shaped core and the terminal taper part are molded with a resin exterior.