JPS5824416Y2 - transformer - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a transformer using a coil bobbin which has a terminal pin on one side of the flange and a groove for drawing out the coil lead wire in the flange. 1st, 2nd
It is an object of the present invention to provide a device that can easily and reliably insulate the secondary coil from the lead wire and the terminal pin.

Conventional transformers of this type have been constructed as shown in FIGS. 1 to 3.

First, the ones shown in Figures 1 and 2 have flanges of 1°1' on both ends.
A terminal pin 3 is planted in one collar 1' of a coil bobbin 2 provided with a coil bobbin 2, and a lead-out groove for guiding the lead wires of the primary coil 4 and secondary coil 5 wound around the coil bobbin 2 to the terminal pin 3. 6, an insulating sheet 7 much longer than the winding width of the coil is interposed between the primary coil 4 and the secondary coil 5, and the end surface of the secondary coil 5 on the side of the collar 2 is covered with this insulating sheet 7. Furthermore, it was configured to cover a part of the outer surface of the secondary coil 5 to provide insulation between the secondary coil 5 and the terminal pin 3 for the primary coil.

The use of the insulating sheet 7 as described above has the disadvantage that the work is extremely time-consuming and productivity is poor.

In addition, the one shown in FIG. 3 incorporates a U-shaped molded product 8 made of an insulator on the primary coil 4 instead of the insulating sheet 7.
The secondary coil 5 is wound within this molded product 8 to provide insulation from the terminal pin 3, but the use of this molded product 8 has the drawback of being extremely disadvantageous in terms of cost.

In addition, 9 in the figure is a magnetic core such as EI Cocoa that is incorporated into the coil bobbin 2.

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. 4 to 7 of the drawings.

10 has tsuba 11.1 on both ends with insulating material such as synthetic resin.
This coil bobbin 10 is equipped with a magnetic core 13 made of EI type ferrite or the like.

A terminal pin 14 is attached to one collar 12 of this coil bobbin 10.
is planted therein, and the terminal pin 14 is provided with a pull-out groove 15 for pulling out the coil lead wire.

A primary coil 16 (this may be a secondary coil) is wound around this coil bobbin 10, and an insulating plate 17 is incorporated in the side of the primary coil 16 that corresponds to the lead-out groove 15. There is.

This insulating plate 17 is made by applying a film or the like on both sides of a strong insulating paper to make it moisture-proof, and has a coil insulating portion 17a having a dimension B that is slightly thicker than the winding width A of the coil bobbin 10.
It is formed by a bent part 17b that is bent at right angles to this coil insulating part 17a and runs along the collar 12, and a terminal part 17C that is bent at right angles to this bent part 17b and runs along the outer surface of the collar 12, This bent portion 17b.

The terminal end portion 17C is formed to be wider than the coil insulating portion 17a so as to be equal to the width of the collar 12.

A secondary coil 18 (which may be a primary coil) is wound around the outside of this insulating plate 17.

The lead wires of both coils 16 and 18 are drawn out from the lead-out groove 15 to a predetermined terminal pin 14 and connected.

The dimension B of the coil insulating portion 17H of the insulating plate 17 is B=1°05 to 1.0° with respect to the winding width A of the coil bobbin 10.
12A, and the coil bobbin 10
They are elastically connected by press-fitting between the flanges 11 and 12, and are tightly attached to the outer peripheral surface of the primary coil 16 by wrapping the secondary coil 18, thereby providing insulation between the primary coil 16 and the secondary coil 18. This can also be performed reliably between the tip of the insulating plate 17 and the collar 11.

As the transformer of the present invention is constructed as described above, the insulation between the coil and the terminal pin can be measured using an inexpensive insulating plate, and its assembly is easy and easy to work with, which is extremely advantageous in mass production. It has the advantage of being highly reliable and has great practical value.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional transformer, Fig. 2 is a bottom view of the same coil bobbin, Fig. 3 is a sectional view of another conventional embodiment, and Fig. 4 is a sectional view of a conventional transformer.
The figure is a sectional view showing one embodiment of the transformer of the present invention, Figure 5 is a perspective view of the main parts, Figure 6 is a front view of an insulating plate used in the transformer, and Figure 7 is a side view of the same. be. 10... Coil bobbin, 11, 12...
・Brim, 13...Magnetic core, 14...Terminal pin, 15...Outlet groove, 16...Primary coil, 17...・Insulating plate, 17a...
・Coil insulation part, 17b...Bending part, 17C
...Terminal section, 18...Secondary coil.

Claims (1)

[Scope of utility model registration request] The primary coil and secondary coil are wound around a coil bobbin that has flanges at both ends, a terminal pin is provided on one of the flanges, and a pull-out groove for pulling out the coil lead wire, and the coils are wound between the two coils and on the outside. In a transformer that incorporates an insulator that insulates the coil and terminal pin, the insulator is
The paper material is moisture-resistant treated and has a coil insulating part that is slightly thicker than the winding width of the coil bobbin, and a bent part that is bent at right angles to the coil insulating part and along the collar that has a pull-out groove. , a transformer using an insulating plate formed by this new curved part and a terminal part bent at right angles and along the outer surface of the collar.