JPH07211548A - Transformer - Google Patents

Abstract

PURPOSE:To provide a plane-type transformer which has excellent high-frequency characteristics by making a capacity between conductor patterns which are formed on printed board and which serve for primary and secondary coils respectively small and by making a capacity formed by through holes small. CONSTITUTION:A first insulating substrate la has at least one opening 4a. On one face of the substrate, a spiral conductor pattern 2a which serves for a primary coil is formed. On the other face, a conductor pattern for electrode extraction 9a which is connected through an inner-side end 7a of the conductor pattern 2a and a through hole 3a is formed. Then, a second insulating substrate 1b is formed in like manner. The two insulating substrates 1a, 1b are piled up and they are put between magnetic materials 8a, 8b from up and down. The through holes 3a, 3b are so formed that they may deviate from each other when the two substrates 1a, 1b are piled up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat type transformer and is used as a signal transmission transformer such as a balun (balanced-unbalanced conversion circuit).

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in a flat type transformer, a conductor pattern 2 is formed in a spiral shape on a surface of a printed circuit board 1 having an opening 4, and an inner end portion 7 and a through hole 3 are provided therebetween. By connecting to the back surface of the printed circuit board 1 and forming the conductor pattern 2 ′ in a spiral shape on the back surface,
The next coil is formed. Reference numerals 6 and 6 ′ are terminals for drawing out electrodes. Similarly, a secondary coil is formed on another printed circuit board 1. Then, as shown in FIG. 5, the printed circuit boards 1a and 1b are attached to the openings 4 of the printed circuit boards 1a and 1b.
The insulating material 5 having the same opening as the above is sandwiched and overlapped, and further, from both upper and lower sides of the printed circuit boards 1a and 1b,
A planar transformer is formed by arranging the magnetic material 8 so as to cover the primary and secondary coils. Here, the protrusion of the magnetic material 8 is inserted into the opening 4 of the printed circuit boards 1a and 1b. The extraction of the electrodes of the primary and secondary coils is performed via the electrode extraction terminals 6 and 6'of the printed boards 1a and 1b.

[0003]

However, in the transformer having the above-mentioned structure, the inner end portions 7 of the spiral conductor patterns 2 and 2'formed on both surfaces of the printed circuit boards 1a and 1b are connected to the through holes 3. Since it is led out to the outside through the coil, the high frequency characteristics are deteriorated due to the capacitance component between the conductor patterns 2 and 2 ′ facing each other.

Further, conventionally, the through holes 3 of the printed circuit boards 1a and 1b are formed so as to face each other, and because of the capacitance component formed between the through hole 3 and the land of the inner end portion 7, the high frequency characteristics of the transformer are obtained. There was a problem that was worse.

The present invention has been made in view of the above points, and an object of the present invention is to provide a capacitance component between conductor patterns formed on each printed circuit board forming a primary coil and a secondary coil. Another object of the present invention is to provide a transformer having excellent high frequency characteristics by reducing the capacitive component formed by the through hole.

[0006]

The invention according to claim 1 is
A conductor pattern forming a primary coil is formed on one surface of a first insulating base material having at least one opening, and a secondary coil is formed on one surface of a second insulating base material having at least one opening. A conductor pattern is formed, the conductor patterns are formed in a spiral shape, the insulating base materials are overlapped so that the conductor patterns and the openings are opposed to each other, and the insulating base materials are formed from both sides of the insulating base material. In a transformer in which a magnetic material is arranged so as to penetrate through each opening, the inner end of the spiral conductor pattern is placed outside on a surface different from the surface on which the spiral conductor pattern is formed. A lead-out conductor pattern for leading out is formed, and an inner end portion of the conductor pattern and one end of the lead-out conductor pattern are connected by forming a through hole in the insulating substrate. In addition, the positions of the through holes provided in the first insulating base material and the positions of the through holes provided in the second insulating base material are arranged so as not to face each other. .

According to a second aspect of the present invention, in the transformer according to the first aspect, the lead-out conductor pattern is linearly formed.

According to a third aspect of the invention, in the transformer according to the first or second aspect, an insulating material is provided between the first and second insulating base materials.

According to a fourth aspect of the present invention, in the transformer according to the first or second aspect, the surface of the first insulating base material on which the conductive pattern for extraction is formed and the second insulating base material are formed. The first and second insulating base materials are opposed to each other so as to be in contact with the surface on which the lead-out conductor pattern is formed, and the lead-out conductor patterns are arranged so as not to come into contact with each other. Is.

[0010]

In the transformer according to the first aspect of the present invention, the spiral conductor pattern having at least one opening is formed on one surface of the primary coil, and the inner end of the conductor pattern is formed on the other surface. And the second insulating substrate formed in the same manner, and the second insulating substrate formed in the same manner, and the second insulating substrate formed in the same manner. By covering with a material and shifting the positions of the through holes of the both insulating substrates when they are superposed, the capacitance component between the through holes is reduced.

A transformer according to a second aspect of the present invention is the transformer according to the first aspect, wherein the lead-out conductor pattern is formed linearly to form a primary or secondary structure.
The capacitance component between the conductor patterns is reduced by reducing the portion facing the conductor pattern forming the next coil.

A transformer according to a third aspect of the present invention is the transformer according to the first or second aspect, wherein an insulating material is provided between the first and second insulating base materials.
The capacitance component between the through holes or the capacitance component between the conductor patterns is reduced, and the conductor patterns formed on both insulating substrates are prevented from being short-circuited.

A transformer according to a fourth aspect of the present invention is the transformer according to the first or second aspect, wherein the surface of the first insulating base material on which the conductor pattern for extraction is formed and the second insulating base are formed. The first and second insulating base materials are opposed to each other so as to contact the surface of the material on which the conductor pattern for extraction is formed, and the conductor patterns for extraction are arranged so as not to contact each other. The capacitance component between the holes or the capacitance component between the conductor patterns is reduced, and the conductor patterns formed on the both insulating substrates are prevented from being short-circuited.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view showing a flat type transformer according to an embodiment of the present invention, and FIG.
It is sectional drawing in X '. A spiral primary coil conductor pattern 2a is formed on the surface of a printed circuit board 1a as an insulating base material, and is connected to the back surface of the printed circuit board 1a at its inner end portion 7a through a through hole 3a. A lead-out conductor pattern 9a for leading out an electrode is linearly formed on the back surface of the printed circuit board 1a, and one end thereof is connected to the through hole 3a. Similarly, the printed circuit board 1b is also formed with a spiral secondary coil conductor pattern 2b, a through hole 3b, and a lead conductor pattern 9b. The printed circuit boards 1a and 1b are connected to the primary and secondary coil conductors 2a and 2b.
In a state of facing each other, an insulating material 5 such as a resist or an insulating film is interposed, and the I-type magnetic material 8a and the E-type magnetic material 8b are sandwiched from above and below the printed circuit boards 1a and 1b, and The protrusions of the E-shaped magnetic material 8b have openings 4a and 4b.
Place it so that it is inserted into. It should be noted that the insulating material 5 is interposed between the printed circuit board 1a and the printed circuit board 1a.
That the conductor patterns such as the secondary coil conductor pattern 2a and the lead conductor pattern 9a and the conductor patterns such as the secondary coil conductor pattern 2b and the lead conductor pattern 9b formed on the printed circuit board 1b are short-circuited. There is no.

Here, the through hole 3a formed in the printed board 1a and the through hole 3b formed in the printed board 1b are formed at positions where they do not face each other. The electrodes of the conductor pattern 2a for the primary coil are taken out from the outer end 10a of the conductor pattern 2a for the primary coil and the end 11a of the conductor pattern 9a for extraction.
The electrode of the conductor pattern 2b for the secondary coil is taken out from the outer end portion 1 of the conductor pattern 2b for the secondary coil.
0b and the end portion 11b of the lead-out conductor pattern 9b.

According to this embodiment, the through holes 3a, 3
Since the position of b is shifted, the through hole 3
Even if the land areas of a and 3b are larger than the patterns of the coil conductors 2a and 2b, the through holes 3a and 3b
The influence of the capacitance between them disappears, and a transformer with excellent high frequency characteristics can be realized.

Further, since the lead-out conductor patterns 9a and 9b formed on the back surfaces of the printed circuit boards 1a and 1b are linearly formed, the conductor patterns 2a and 2b formed on the front surfaces of the printed circuit boards 1a and 1b, respectively. The number of facing portions is reduced, and the influence of the capacitance in this portion is also reduced.

FIG. 3 is an exploded perspective view showing a flat type transformer according to another embodiment of the present invention. The transformer according to the present embodiment is the same as the transformer according to the above-described embodiment except for the printed circuit board 1
b is turned upside down, that is, the printed circuit board 1a and the printed circuit board 1b on which the conductor patterns 9a and 9b are formed face each other, and the conductor patterns 9a and 9b for leader are not opposed to each other. In this way, they are superposed.

According to this embodiment, the insulation between the printed circuit boards 1a and 1b can be achieved without using the insulating material 5.

[0020]

According to the first aspect of the invention, a spiral conductor pattern having at least one opening is formed on one surface of the primary coil, and the conductor pattern of the conductor pattern is formed on the other surface. A first insulating substrate having an electrode lead-out conductor pattern connected to the inner end portion through a through hole and a second insulating substrate formed in the same manner are stacked on top of each other to form a vertical direction. Since the through holes of the two insulating substrates are displaced from each other when they are superposed on each other, the primary and secondary coils formed on each printed circuit board are covered. It was possible to provide a transformer having excellent high frequency characteristics by reducing the capacitance component of the conductor pattern and the capacitance component between through holes.

According to the second aspect of the present invention, in the transformer of the first aspect, the lead-out conductor pattern is formed linearly, so that it faces the conductor pattern forming the primary or secondary coil. By reducing the number of portions, it is possible to reduce the capacitance component between the lead-out conductor pattern and the conductor pattern forming the primary or secondary coil, and further it is possible to obtain a transformer having excellent high frequency characteristics.

According to the invention of claim 3, in the transformer of claim 1 or 2, the first and second transformers are provided.
Since an insulating material is provided between the insulating base materials, the capacitance component between through holes or the capacitance component between conductor patterns is reduced, and further, the conductor patterns formed on both insulating substrates are short-circuited. Can be prevented.

According to a fourth aspect of the present invention, in the transformer according to the first or second aspect, a surface of the first insulating base material on which a conductor pattern for extraction is formed,
The first and second insulating base materials are opposed to each other so that the surface of the insulating base material on which the conductive pattern for extraction is formed is contacted, and the conductive pattern for extraction is arranged so as not to contact each other. As a result, the capacitance component between the through holes or the capacitance component between the conductor patterns can be reduced, and furthermore, the conductor patterns formed on both insulating substrates can be prevented from being short-circuited.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of the above.

FIG. 3 is an exploded perspective view showing a transformer according to another embodiment of the present invention.

FIG. 4 is a plan view showing a transformer according to a conventional example.

[Fig. 5] YY in a state in which the transformer according to the above is disassembled.
FIG.

[Explanation of symbols]

 1a Printed board 1b Printed board 2a Primary coil conductor pattern 2b Secondary coil conductor pattern 3a Through hole 3b Through hole 4a Opening part 4b Opening part 5 Insulating material 7a Inner end part 7b Inner end part 8a Magnetic material 8b Magnetic material 9a Conductor pattern for drawing 9b Conductor pattern for drawing 10a Outer end 10b Outer end 11a End 11b End

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[Procedure amendment]

[Submission date] November 18, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

Means for Solving the Problems The invention according to claim 1,
A conductor pattern forming a primary coil is formed on one surface of the first insulating base material, a conductor pattern forming a secondary coil is formed on one surface of the second insulating base material, and the conductor patterns are spirally formed. formed, each of said insulating substrate, in trans superimposed so that each conductor pattern is pairs <br/> direction, said each spiral surface different conductive pattern is formed faces the spiral Forming a lead-out conductor pattern for leading out the inner end portion of the conductor pattern in the shape of a strip, and connecting the inner end portion of the spiral conductor pattern and one end of the lead-out conductor pattern to the insulating substrate. The holes are connected by forming holes, and the positions of the through holes provided in the first insulating base material and the positions of the through holes provided in the second insulating base material are arranged so as not to face each other. Characterized by To do.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

In the transformer according to the first aspect of the present invention , the spiral conductor pattern forming the primary coil is formed on one surface, and the other surface is connected to the inner end of the conductor pattern through the through hole. first insulating substrate, overlaid one the second insulating substrate which is formed in a similar manner to that when allowed before Symbol superimposed, through holes of the two insulating substrate formed with the conductor pattern pull out, which are By shifting the position of, the capacitance component between the through holes is reduced.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

FIG. 3 is an exploded perspective view showing a flat type transformer according to another embodiment of the present invention. Transformer according to the present embodiment, the PCB 1a and lead-out conductor pattern 9a of the printed circuit board 1b, so as to face each other the formed surface of 9b, and a lead conductor patterns 9a, 9b
Are stacked so that they do not face each other.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020]

According to the first aspect of the present invention, the spiral conductor pattern forming the primary coil is formed on one surface,
Weight and the first insulating substrate to the other surface forming the inner end and the conductor pattern out-out connected arguments via the through-hole of the conductor pattern, a second insulating substrate which is formed in a similar manner to it fit, when allowed before Symbol overlapped. Thus the position of the through-holes of both the insulating substrate is shifted,
By reducing the capacitance component of the conductor pattern forming the primary and secondary coils formed on each printed circuit board, it is possible to provide a transformer having excellent high frequency characteristics.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

According to the second aspect of the present invention, in the transformer of the first aspect, the lead-out conductor pattern is formed linearly, so that it faces the conductor pattern forming the primary or secondary coil. part Ri is small,
It is possible to reduce the capacitance component between the lead-out conductor pattern and the conductor pattern forming the primary or secondary coil,
Furthermore, a transformer having excellent high frequency characteristics can be obtained.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (4)

[Claims] 1. A conductor pattern forming a primary coil is formed on one surface of a first insulating base material having at least one opening, and is formed on one surface of a second insulating base material having at least one opening. A conductor pattern forming a secondary coil is formed, the conductor patterns are formed in a spiral shape, and the insulating base materials are stacked so that the conductor patterns and the openings face each other. In the transformer in which the magnetic material is arranged so as to penetrate the openings from both sides of the material, the inner surface of the spiral conductor pattern is different from the surface on which the spiral conductor pattern is formed. A lead-out conductor pattern for leading out an end portion to the outside is formed, and a through hole is formed in the insulating substrate at an inner end portion of the conductor pattern and one end of the lead-out conductor pattern. Connected by and first
The transformer is arranged so that the positions of the through holes provided in the insulating base material and the positions of the through holes provided in the second insulating base material do not face each other. 2. The transformer according to claim 1, wherein the lead-out conductor pattern is linearly formed. 3. The transformer according to claim 1, wherein an insulating material is provided between the first and second insulating base materials. 4. The first and the first insulating base materials so that the surface of the first insulating base material on which the extraction conductor pattern is formed and the surface of the second insulating base material on which the extraction conductor pattern is formed are in contact with each other. 3. The transformer according to claim 1 or 2, wherein the two insulating base materials are opposed to each other and the lead-out conductor patterns are arranged so as not to contact each other.