JPS6244507Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to provide a small coil that is easy to assemble and has excellent mass productivity.

Conventional small coils have been constructed as shown in FIGS. 1 to 4.

That is, a cap-shaped lower core 2 having a winding core 1 in the center has cutout windows 3 in opposing parts of the circumferential surface.
A ring-shaped insulating plate 4 having protrusions 5 on opposing sides is fitted into the cap-shaped lower core 2, and the protrusions 5 are made to protrude from the cutout window 3 of the cap-shaped lower core 2. Copper foil is pasted on the upper and lower surfaces of the protruding part to form a terminal part 6, and a coil 7 wound in a ring shape is inserted into this cap-shaped lower core 2.
This cap-shaped lower core 2 is covered with a cap-shaped upper core 9 which also has a winding core 8 in the center and has a notch window 10 facing each other on the circumferential surface, and a lead wire 11 drawn out from the coil 7 is connected to the terminal portion. 6 and connected by solder 12.

In such a configuration, when this small coil is soldered to a printed circuit board using the terminal section 6, since the peripheral surface of the terminal section 6 is the insulating plate 4, it is not possible to solder with sufficient strength. Moreover, it is not possible to arbitrarily form the shape of the projecting piece 5 of the insulating plate 4, and the installation height cannot be freely controlled.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 5 to 8.

Reference numeral 13 denotes a cap-shaped lower core with an open upper surface, which has a central winding core 14, and has cutout windows 15 formed on opposing surfaces of the circumferential surface.

Y-shaped terminals 16 and 17, which are made of a metal plate and have two arcuate prongs, are incorporated into this cap-shaped lower core 13, with one piece protruding from the notched window 15. As shown in FIG. 8, 17 has an insulating film 18 coated with resin so that only the tip of one piece protruding from the cutout window 15 is exposed, and the other parts are coated with an insulating film 18 made of resin coating.

A ring-shaped coil 19 that fits into the winding core 14 is incorporated into the cap-shaped lower core 13 in which the terminals 16 and 17 are incorporated, and the lead wires 20 at both ends of this coil 19 are pulled out from the notched window 15 to form the terminal. Wrap it around the metal part of the tip opening of 16 and 17,
They are connected by solder 21.

Furthermore, the cap-shaped lower core 13 has a winding core 22 at the center, and a cap-shaped upper core 24 with an open bottom surface and a cutout window 23 provided in opposing parts of the circumferential surface.
are covered to form a small coil.

As shown in FIG. 9, the terminals 16 and 17 are continuously punched out from a band-shaped hoop material 25, an insulating film 18 is formed thereon, and the continuous portion is cut and separated when assembled into the cap-shaped lower core 13. This is also advantageous when it comes to automation.

Furthermore, when a small coil having such a configuration is assembled into a printed circuit board 26 as shown in FIG. 10, the metal parts of the terminal parts 16 and 17 can be connected to the conductive pattern 27 of the printed circuit board 26 by solder 28. Sufficient soldering strength can be achieved, and as shown in Figs. 11 and 12, forming of the terminal parts 16 and 17 is also easy because they are made of metal, allowing for small installation spaces for electronic wristwatches, electronic desk calculators, etc. Incorporation into products can also be advantageous.

As mentioned above, by making the terminal of the small coil of the present invention made of metal, it is possible to improve the soldering strength to printed circuit boards, etc., and it can be formed freely, so the installation space can be used effectively, and the terminal can be easily processed. It is easy to use and allows for built-in automation, improving productivity and reducing costs.Furthermore, the heat generated by the coil through the terminal can be effectively dissipated to the outside, improving quality. It has many advantages and is of great practical value.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional small coil, Fig. 2 is a sectional view of the same, Fig. 3 is an exploded perspective view of the same, Fig. 4 is a perspective view of the main part of an insulating plate having the same terminal section, and Fig. 5 is a perspective view of a conventional small coil. A perspective view showing an embodiment of the small coil of the present invention,
Fig. 6 is a sectional view, Fig. 7 is an exploded perspective view, and Fig. 8 is an exploded perspective view.
9 is a perspective view showing an example of the manufacturing process of the terminal, and FIGS. 10 to 12 are explanatory diagrams showing examples of use of the small coil. 13... Cap-shaped lower core, 14... Winding core, 15... Notch window, 16, 17... Terminal, 18... Insulating film, 19... Coil, 20...
... Lead wire, 21 ... Solder, 22 ... Winding core,
23...Notched window, 24...Cap-shaped upper core.

Claims (1)

[Scope of utility model registration request] A cap-shaped upper and lower core with a winding core in the center, a ring-shaped coil, a Y-shaped coil punched from a metal plate with two arcuate prongs, and a terminal part with an insulating film formed on the part in contact with the core. A small coil formed by incorporating a member having the above-mentioned coil and connecting the lead wire of the coil to the terminal part.