JP2576622Y2 - Transformer member - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a small transformer used in an electronic circuit.

[0002]

2. Description of the Related Art Generally, a small transformer member 3 of this kind is used.
0 is a terminal 13 for external connection as shown in FIG.
A transformer 18 in which a conductive wire 3 is wound around a toroidal core 15 on an insulating (resin) substrate 11 integrally molded with 13,.
With the primary and secondary conductors (leads) 3,
, 3 are connected to the respective terminals 13, 13,..., 13 in FIG.
As shown in the figure, it is wound and soldered. In the case of FIG. 7B, the transformer member 30 having a tap terminal is provided.
Is shown.

[0003]

However, in recent years, transformer members 30 have been produced in small quantities for a wide variety of uses. For this reason, in the above-described conventional transformer members 30, 40, the terminals 13, 13,
In order to design and manufacture the insulating substrates 11 and 21 in which the insulating substrates 11 and 13 are integrally formed, a mold is required each time, and it takes time to commercialize the insulating substrates 11 and 21 in accordance with individual specifications.
There has been a disadvantage that the unit price of the transformer members 1 and 21 increases and the unit price of the transformer members 30 and 40 increases.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the disadvantages of the prior art and to provide a transformer member having a relatively simple structure and requiring no mold for manufacturing an insulating substrate. .

[0005]

Accordingly, the present invention provides a transformer member comprising a transformer having a primary winding and a secondary winding formed by winding a conductive wire around a toroidal core on an insulating substrate. The insulating substrate has a polygonal shape of at least a quadrangle or more, and a notch is provided on each side of the insulating substrate so as to sandwich each corner, and a conductive layer is formed on at least a lower surface of the corner sandwiched by the notches. Is formed and the conductive wire is wound around each corner, thereby achieving the object.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The transformer member 1 shown in FIG. 1 has side surfaces 8, 8,..., 8 sandwiching each corner 4 of a hexagonal insulating substrate.
Notches 6 and 6 are provided so as to sandwich the corners 4 and 4, respectively. A toroidal shape is formed on an insulating substrate 7 having a conductive layer 5 formed on the upper, side, and lower surfaces of the corner 4 sandwiched by the notches 6 and 6. A transformer with a tap around which a conductor 3 is wound around the core 2 is placed,
Each of the conductors 3 is wound around a corner 4 and integrated by soldering or the like.

The conductive layer 5 formed on the corner portion 4 may be provided only on the lower surface, which is the contact surface with the pattern 22 of the circuit board 20 on which the transformer member 1 is mounted (FIG. 6).
(A)), in this configuration, when the corners 4 and the pattern 22 are connected using the solder A, only the surface B in the drawing is connected, and the reliability of soldering is reduced. It is better to provide the conductive layer 5 from the lower surface to the side surface of the corner 4 as shown in FIG. According to this configuration, since the solder A is applied to the lower surface and the side surface of the corner portion 4 (contact surface C), the connection area with the pattern 22 is increased, and the reliability of soldering can be easily improved.

FIGS. 4 and 5 show another embodiment of the present invention, in which the insulating substrate 17 has a quadrangular shape and each corner 4 of the insulating substrate.
, 8 are provided with cutouts 6, 6 so as to sandwich the corners 4, 4 respectively, and the upper, side, and lower surfaces of the corner 4 sandwiched by the cutouts 6, 6 are electrically conductive. On the insulating substrate 17 on which the layer 5 is formed, a transformer in which the conductor 3 is wound around the toroidal core 12 is mounted, and each conductor 3 is wound around the corner 4 to be integrated.

Since the present embodiment is constructed as described above, the insulating members 7 and 17 provided with the corners 4 and the notches 6 are formed, and the conductive layer 5 is provided on the corners 4. , 10 can be easily formed, so that there is no need to use a mold for forming the insulating substrates 11 and 21 as in the conventional example, so that the unit price of the insulating substrates 7 and 17 can be reduced, and the insulating substrates 7 and 17 can be formed. The formation can be performed by using the printed circuit board manufacturing technology, so that the design and manufacturing are quick, and the product cost can be reduced even in the case of high-mix low-volume production. Further, the transformer members 1, 1
Since 0 can be reflow-soldered when mounted on a circuit board, there is an advantage that the work of connecting the lead wire 3 to the insulating boards 7 and 17 can be simplified.

[0010]

According to the present invention, as described above, the present invention can provide a transformer member having a relatively simple structure and requiring no mold for manufacturing an insulating substrate.

[Brief description of the drawings]

FIG. 1 is a top view of a transformer member according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a front view of an insulating substrate forming a part of FIG. 1;

FIG. 4 is a perspective view of a transformer member according to another embodiment of the present invention.

FIG. 5 is an explanatory view of an insulating substrate constituting a part of FIG. 4;

FIG. 6 is an explanatory diagram of a connection state of the transformer member shown in FIGS. 1 and 4 to a circuit board.

FIG. 7 is an explanatory view of assembling a transformer member according to a conventional example.

[Explanation of symbols]

 1, 10 Transformer member 2, 12 Toroidal core 3 Conductor wire 4 Corner 5 Conductive layer 6 Notch 7, 17 Insulating substrate 8 Side surface

Claims (1)

(57) [Scope of request for utility model registration] A transformer member comprising a transformer having a primary winding and a secondary winding formed by winding a conductive wire around a toroidal core and mounting the transformer on an insulating substrate, wherein the insulating substrate has a polygonal shape of at least a quadrangle or more. A cutout is provided on each side of the insulating substrate so as to sandwich the corner, and a conductive layer is formed on at least the lower surface of the corner sandwiched by the notch. A transformer member having a conductive wire wound thereon.