JPH03253009A - Inductor and transformer - Google Patents

Abstract

PURPOSE:To cut down the manufacturing manhours required for the winding process and the connection of winding ends to mounting terminals while enabling the title inductor even for large current to be made serviceable by one body formation of the surface mounting terminals and a winding part. CONSTITUTION:In order to form an inductor, firstly, the conductive material sheet 1 of a conductor is cut off in a shape shown by broken lines to produce a conductor wire in folded back zigzag shape. Next, a hollow core inductor is formed by bending the halfway parts of the folded back conductor wire alternately, upward and downward. This inductor is composed of winding parts 3 and four surface mounting terminals 4 holding the winding parts 3. This inductor can be manufactured in miniaturized shape having high inductance by fitting it with cores 5, 6 passing through the hollow part and covering the outer surface of the winding parts 3 so as to be held by a holder 7 formed into one body. Through these procedures, the manufacturing manhours in the winding process and the connection of winding ends to the terminals 4 can be cut down by the one body formation of the terminals 4 and the winding parts 3 thereby enabling the inductor even for large current to be easily manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inductor and a truss, and particularly to an inductor 3 for surface mounting.

[Conventional technology]

Conventional inductors and transformers for surface mounting include electrical annealed copper wire wound around a small bobbin made of insulating material such as plastic, and both ends of which are connected to terminals for surface mounting, or a conductor wire wrapped around a magnetic material plate. A magnetic paint is printed on top of the paste, and this is repeated several times to form a winding body and a magnetic core, and the conductive paste is used to extend and connect the end of the winding to the mounting terminal. It is used.

[Problem to be solved by the invention]

Conventional inductors and transformers that wind wires around a bobbin require a lot of time and effort to connect both ends of the winding to surface mount terminals by soldering, etc., and also require a large number of materials and parts. However, there is a problem in that it becomes expensive. Moreover, those manufactured by printing have the disadvantage that the conductor cannot be made very thick, resulting in high winding resistance, and the conductor loss is large, allowing only a small current to flow.

Means for Solving the Problem] The interfacer of the first aspect of the present invention is provided by cutting a single conductive material plate into the shape of a staggered folded line, and cutting the center part of the folded line alternately upward and downward. It has a winding part formed by bending it.

In the transformer of the second invention, a laminated board made by stacking a plurality of conductive material plates with a thin insulating material sandwiched between each plate is cut into a staggered folded line shape, and the central part of the folded line is cut into a shape of a staggered folded line. It has a winding portion formed by vertically bending the wires alternately.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIGS. 1(a) to (b) and (c) to (d) are a top view and a perspective view of an embodiment of the first invention of the present invention,
The order of forming interfaces is shown. As shown in FIG. 5(a), a conductor plate 1 is first cut into the shape shown by the broken lines to obtain conducting wires folded in a staggered manner as shown in FIGS. 4(b) and 3(c). The midway portions of the folded conductive wire are bent vertically alternately by press molding or the like to form an air-core interfter as shown in FIG. 2(d). This interface is
It has a winding part 3 that responds to conventional winding and four terminals 4 for surface mounting, and electrically it can be used as a coil if there is one terminal 4 at each end. Considering whether it can be used and stability of attachment during mounting, this embodiment is designed so that it can be held with four terminals.

This embodiment is an air-core inductor, or it is equipped with cores 5 and 6 that penetrate the hollow part of the winding part 3 and cover the outer surface of the winding part 3, as shown in FIG. 2(a). , Figure 2 (b
), it is possible to realize a higher inductance in a smaller size by holding it integrally with the holter 7.

FIGS. 3(a) to 3(e) are perspective views of an embodiment of the second invention of the present invention, showing the order in which the transformer is formed. First, 2
A plate 8 of a conductive material for forming one winding of a wire-wound transformer is press-cut to punch out a terminal 9 portion, which is further bent using a press and formed as shown in Figure (b). I'll keep it. A plate 10 of a conductive material for forming the other winding is adhered to this upper surface via an insulating film 4 (FIG. 4(C)). This is press-cut and shaped into the staggered folded shape shown in Figure (d), and then pressed so that the folds are bent vertically alternately, as shown in Figure (e). A two-winding air-core transformer is formed. usually,
The wiring terminal on the mounting board is terminal 9 for mounting the transformer.
Since the area is larger than the above, a gap 11 is provided to ensure insulation between the primary and secondary windings.

Although this embodiment is an air-core transformer, if a core 12 as shown in FIG. 4(a) is installed and held by a holter 13 as shown in FIG. 4(b), a transformer with a higher degree of coupling can be obtained. Can be realized in a small size.

In the transformer configured as described above, the folded ends of the windings can be used as connection terminals, so in any of the above embodiments in which the primary and secondary winding ratios can be selected from a wide range, it is possible to connect the windings to the terminals. Since everything up to and including the above can be integrally formed, the number of parts used can be reduced and the price can be lowered than before. In addition, the winding resistance is lower than that by printing, and it can be used not only for small current applications.

〔Effect of the invention〕

As explained above, the present invention has the advantage that by integrally forming the surface mounting terminal and the winding part, the manufacturing man-hours required for the winding process and the connection of the winding end to the mounting terminal can be omitted. There is. Furthermore, since the winding portion is made of a conductive material plate, it is possible to easily obtain a large current type by appropriately selecting the thickness.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are top views of the embodiment of the present invention;
Figures (c) and (d), Figures 2 (a) and (b), Figures 3 (a) to (e), and Figures 4 (a) and (b) are perspective views of embodiments of the present invention. 1 8. 0... Conductive material plate, 3... Winding portion,... Terminal, 12... Core, 3... Holder.

Claims (4)

[Claims] 1. An inductor having a winding portion formed by cutting one conductive material plate into the shape of a staggered folded line and bending the center part of the folded line alternately up and down. 2. 2. The inductor according to claim 1, wherein a core of magnetic material is mounted in the curved hollow part of the winding part. 3. A laminated board made by stacking a plurality of conductive material plates with a thin insulating material sandwiched between each plate is cut into a staggered folded line shape, and the center part of the folded line is bent vertically alternately. A transformer with a winding section formed by 4. 4. The transformer according to claim 3, wherein a core of magnetic material is mounted in the curved hollow part of the winding part.