JPS60715A - Transformer - Google Patents

Abstract

PURPOSE:To contrive thinning of the title transformer by a method wherein a primary coil and a secondary coil are spirally formed on both sides of an insulated plate having a through hole in the center part, and after an insulating film has been covered, a magnetic material is formed thereon. CONSTITUTION:A through hole 1a is provided in the center part of a round and thin insulated plate 1. A spiral primary coil conductor 2 is formed by patterning on the upper surface of the round insulated plate 1, a spiral secondary coil conductor 3 is formed by patterning on the lower surface of the insulated plate 1, and then electrode parts 2a, 2b, 3a and 3b are provided. After primary lead-out wires 2c and 2d have been connected to the electrode parts 2a and 2d, and secondary lead-out wires 3c and 3d have been connected to electrode parts 3a and 3b, an insulating film 4 is formed on the whole surface. Then, a magnetic material 5 whereon powdery magnetic material bonded by binder is applied is formed on the upper surface of the insulating film 4. As a result, the thickness of the entire transformer can be reduced to 0.5mm. or thereabout.

Description

[Detailed description of the invention] The present invention relates to a small transformer for communication.

Conventionally, this type of transformer has a thin copper foil conductor formed as a coil on the surface of a thin insulating plate such as a plastic film by adhesion or vapor deposition, and a magnetic conductor made separately from this coil. It is composed of a combination with a body (magnetic path), and this makes it thinner.

However, if the coil part and the magnetic material are made separately in this way, the coil part can be formed into a sheet shape as described above, but the magnetic material must be passed through the coil part to form a magnetic path. Therefore, there are limits to making the transformer even thinner due to its structure.

The present invention has been made in view of the above points, and an object of the present invention is to provide a transformer that is thinner than the conventional transformer.

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

As shown in FIGS. 1 to 3, the transformer according to the present invention includes a thin circular insulating plate 1, and a through hole 1 in the center thereof.
A is provided. A spiral primary coil conductor 2 is patterned on the upper surface of the insulating plate 1 by optical etching or the like, and on the lower surface thereof, as shown in FIG.
A spiral secondary coil conductor 3 is patterned in a similar manner, and electrode portions 2a are provided at both ends of each coil conductor 2 and 3.
, 2b and 3a, 3b are provided. The insulating plate 1 can be formed as a film with a thickness of several tens of micrometers, and the coil conductors 2 and 3 can be formed with a thickness of several tens of micrometers, so the thickness of the coil portion is 10 μm thick.
The thickness is approximately 0 μm.

The electrode parts 2a and 2b have primary lead wires 2c't2.
d, and the electrode parts 3a and 3b have secondary sunrise wires 3c and 3d.
are connected to each other, and these Hiji lines are drawn out.

Such a coil part is immersed in a plastic melt, thereby forming an insulating film 4 on its entire surface. A magnetic material 5 is formed on the upper surface of the insulating film 4 by coating powdered magnetic material bound with a binder. In this way, when the insulating film 4 and the magnetic material 5 are directly formed on the coil part, the thickness of the insulating film 4 and the magnetic material 5 is several tens of μm.
Since the thickness of the entire transformer is 500 μm,
In other words, it can be reduced to about 0.5w.

In the transformer with the above configuration, when a voltage is applied between the respective outlet wires 2c and 2d connected to the secondary coil conductor 2, magnetic flux is mainly generated in the magnetic body 5, but this magnetic body 5 acts as a magnetic path. Since it is interlinked with the secondary coil conductor 3, the magnetic flux is also interlinked with the secondary coil conductor 3, so that a voltage is induced in the secondary coil conductor 3 according to the turns ratio with respect to the primary coil conductor. The equivalent circuit of this transformer is shown in FIG.

As described above [7], according to the present invention, a coil portion comprising thin film conductors as primary and secondary coils on both sides of a thin insulating plate is integrally formed with an insulating film and a magnetic material as a magnetic path. were formed in this order.

An extremely thin transformer can be obtained. This transformer is thin and flexible, making it resistant to mechanical vibrations.
In addition, the structure is further cut and pattern formed.

Since the transformer can be manufactured through easily automated processes such as etching and molding, it is also possible to manufacture the transformer at low cost.

[Brief explanation of the drawing]

1 to 3 are a plan view, a sectional view, and a bottom view of a transformer according to the present invention, respectively, and FIG. 4 is an equivalent circuit diagram of the transformer according to the present invention. DESCRIPTION OF SYMBOLS 1... Insulating plate, 2, 3... -order and secondary coil conductor, 4... Insulating film, 5... Magnetic material. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Masu Oiwa Female Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] an insulating plate having a through hole in the center; a thin film conductor spirally formed as a primary coil and a secondary coil on both sides of the insulating plate; and an insulating film covering the insulating plate including the thin film conductor on both sides of the insulating plate. and a magnetic material as a magnetic path formed on the insulating film.