JPH10256048A - Compact transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a binding operation by adhering a second substrate with a through hole at a part for accommodating a toroidal coil onto a first substrate for mounting the toroidal coil and pulling the terminal of the toroidal coil in the direction of each terminal pin through the adhesive surface of both substrates. SOLUTION: A toroidal coil (coil) 13 is aligned and mounted on a substrate 11 and at the same time is adhered to a substrate 11 by an adhesive. A substrate 15 with a through hole at a part for accommodating the coil 13 is mounted on the substrate 11 and is adhered by the adhesive. A terminal pin 17 that is planted at the substrate 11 and a cut-out from the side surface of its surrounding are formed on the substrate 15 and a space is formed around the terminal pin 17. When the substrate 15 is adhered to the substrate 11, it is adhered and fixed while the terminal of the coil 13 is being pulled in the direction of a specific terminal pin. Then, the terminal of the coil 13 is drawn near the terminal pin 17 to be connected through the adhesive surface of the substrates 11 and 15 and is bound to the terminal pin 17 after the substrates 11 and 15 are adhered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a small transformer, and more particularly to a structure for accommodating a toroidal core of a small transformer suitable for a pulse transformer module or the like and connecting a terminal of a winding.

[0002]

2. Description of the Related Art In a pulse transformer module, a plurality of toroidal coils are attached to a substrate, and terminals of windings of the respective toroidal coils are connected to terminal pins planted near an end surface of the substrate. FIG. 4 is a perspective view of an example of such a pulse transformer module, in which a toroidal coil 43 having a winding wound on a substrate 41 is mounted and bonded, and the terminals of those windings are wrapped around terminal pins 47. Thereafter, the terminal and the terminal pin are connected by dip soldering.

[0003]

In the case of the above structure, since the terminal of the toroidal coil is not fixed,
It is necessary to sort the wires when tying to the terminal pins, and since the terminal is pulled out from the upper surface of the toroidal coil, the tying becomes difficult and the number of steps increases.

[0004] Further, at the time of solder dip, the coating of the winding of the toroidal coil body is deteriorated by heat, and in some cases, a short circuit occurs. Use of a jig to prevent this is considered, but the shape of the jig becomes complicated and expensive.

An object of the present invention is to provide a small-sized transformer which can easily sort terminals of windings of a toroidal coil, can be easily tied to terminal pins, and requires a small number of manufacturing steps. It also prevents the deterioration of the coating of the winding during soldering.

[0006]

The present invention solves the above-mentioned problems by combining a substrate on which a toroidal coil is mounted with a substrate having a through hole for accommodating the toroidal coil.

That is, in a small transformer in which a plurality of toroidal coils are mounted on a substrate on which terminal pins are implanted and terminals of the respective toroidal coils are connected to the terminal pins, a first substrate on which the toroidal coils are mounted is provided on a first substrate. A second substrate having a through hole is adhered to a portion for accommodating the toroidal coil, and the terminal of the toroidal coil is pulled out in the direction of each terminal pin through the adhesion surface of the first substrate and the second substrate. It has features.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The steps of manufacturing a small transformer according to the present invention are as follows. Winding to the toroidal coil Mounting and bonding the toroidal coil to the first substrate Bonding the second substrate to the first substrate and pulling out the terminal of the winding Soldering dip to the terminal pin of the terminal of the winding Connection by

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention. The toroidal coils 13 are mounted on the substrate 11 side by side, and are adhered to the substrate 11 with an adhesive. A substrate 15 having a through-hole in a portion for accommodating the toroidal coil 13 is mounted on the first substrate 11 and bonded with an adhesive. The substrate 15 has a terminal pin 17 implanted in the substrate 11 and a cutout formed in a side surface around the terminal pin 17 to form a space around the terminal pin 17.

When bonding the substrate 15 to the substrate 11, the terminal of the toroidal coil is bonded and fixed in a state of being pulled in the direction of a predetermined terminal pin. As a result, the terminal of the toroidal coil is pulled out through the bonding surface between the substrate 11 and the substrate 15, and is pulled out to a position near the terminal pin 17 to be connected.

After bonding the substrate 11 and the substrate 15, the terminal of the toroidal coil is wrapped around a predetermined terminal pin 17. Each terminal is pulled out at the same height, and it is fixed in a predetermined direction except for the tip, so there is no need to sort lines when tying, making it easier to work Become.

When the soldering is performed after the terminal of the toroidal coil is removed, since the toroidal coil is housed in the concave portion formed by the substrate 15 and the substrate 11, the deterioration of the coating of the winding due to the contact of the solder is prevented. Can be prevented. Therefore, the thickness of the substrate 15 is preferably equal to or slightly greater than the thickness of the toroidal coil 13.

FIG. 2 is a perspective view showing another embodiment of the present invention. In this example, the shape of the substrate 25 having a through hole for accommodating the toroidal coil 23 is simplified. The terminal pins 27 are formed so as to protrude in a line on both sides of the substrate 25 without the notch on the end face. In this example,
The manufacturing process is the same as in the above example.

FIG. 3 shows a substrate containing a toroidal coil.
35 shows another example of 35, in which through holes are not formed separately but connected to each other. With this configuration, it is easy to absorb and accommodate the dimensional error and the like of the toroidal coil.

[0016]

According to the present invention, the direction in which the terminal of the toroidal coil is pulled out can be defined, so that the subsequent ganging process is facilitated, the number of steps can be greatly reduced, and an inexpensive transformer can be obtained.

Further, since the winding of the toroidal core is solder-dipped in a state of being accommodated in the recess formed by the second substrate, it is possible to prevent the solder from contacting the coating of the winding and deteriorating.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing another embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional small transformer.

[Explanation of symbols]

 11, 21, 41: Board 13, 23, 43: Toroidal coil 15, 25: (Second) board 17, 27, 47: Terminal pin

Claims (5)

[Claims] 1. A small transformer in which a plurality of toroidal coils are mounted on a substrate on which terminal pins are implanted and terminals of the respective toroidal coils are connected to the terminal pins, respectively. A second substrate having a through hole is bonded to a portion for housing the toroidal coil, and the terminal of the toroidal coil is pulled out in the direction of each terminal pin through the bonding surface of the first substrate and the second substrate. Features a small transformer. 2. A small transformer in which a plurality of toroidal coils are mounted on a substrate on which terminal pins are implanted and terminals of the toroidal coils are connected to the terminal pins, respectively. A second substrate having a through hole is adhered to a portion for accommodating the toroidal coil, and the terminal of the toroidal coil is pulled out in the direction of each terminal pin through the adhesion surface of the first substrate and the second substrate, and each A small transformer in which terminals are entangled with terminal pins and soldered. 3. A small transformer in which a plurality of toroidal coils are mounted on a substrate on which terminal pins are implanted and terminals of the toroidal coils are connected to the terminal pins, respectively. A second substrate having a through hole in a portion for accommodating the toroidal coil, a portion where the terminal pin is located and a cutout from the side around the portion is bonded, and a terminal of the toroidal coil is connected to the first substrate and the second substrate. A small transformer drawn out in the direction of each terminal pin through the bonding surface of the two substrates. 4. The small transformer according to claim 1, wherein the plurality of toroidal coils constitute a pulse transformer module. 5. The small transformer according to claim 1, wherein the thickness of the second substrate is larger than the thickness of the toroidal coil.