JP2832130B2 - Lamination method of ceramic green sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laminating ceramic green sheets, and more particularly to a method for laminating ceramic green sheets characterized by a step of forming a coil conductor pattern on the ceramic green sheets.

[0002]

2. Description of the Related Art Hitherto, a laminated transformer has been manufactured by laminating ceramic green sheets on which an internal conductor pattern has been formed in a predetermined configuration. The sheet has been formed by laminating sheets by a method (sheet method) as shown in FIG.

[0003] First, a low-μ ceramic paste 5 is formed on a high-μ ceramic green sheet 2 formed on a pet film 1 as shown in FIG. (The size is slightly larger than the winding pattern of the coil.)
(B)) Then, after a through hole 6 for interlayer connection is opened at a predetermined position (FIG. 4C), the coil conductor pattern 7 is formed.
Is formed by printing (FIG. 4 (d)), and the obtained sheets are laminated in a predetermined configuration and connected through holes.

[0004]

However, the laminated body formed by the above-mentioned conventional ceramic green sheet laminating method has a problem that the low μ material is disposed only under the coil conductor, and thus the bonding property is poor. Was.

That is, for example, the primary coil 8 is internally provided by the above-described conventional method of laminating ceramic green sheets.
When a laminated transformer (laminate) in which the secondary coil 9 is embedded is manufactured, a magnetic flux 10 is formed on each of the low μ material portions 12 as shown in the lamination direction cross-sectional view of the laminate in FIG. Coil winding pattern (coil conductor pattern 7)
(The high μ material portion 11), the amount of magnetic flux 10 around the entire coil including the primary coil 8 and the secondary coil 9 decreases.

Therefore, the present invention solves the above-mentioned problems of the prior art, and makes it possible to extremely easily form a laminate having excellent bonding properties even with a large ceramic green sheet. The aim is to provide a method.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to achieve the above object, and as a result, made a cut in the outer peripheral shape of the coil orbital pattern with a laser in a high μ ceramic green sheet, By overlapping and peeling off the film coated with the adhesive in the circuit pattern, a groove of the coil circuit pattern is formed on the sheet,
After filling the groove with a low-μ ceramic paste to form a through hole, and forming a coil conductor pattern on the paste, the inventors have found that the above-mentioned problems can be solved, and have reached the present invention.

That is, according to the present invention, a through-hole and a coil conductor pattern are formed on a plurality of ceramic green sheets, and these sheets are laminated and formed with a structure in which a helical coil is embedded in a ceramic body. A method for laminating ceramic green sheets to be connected, wherein a high-μ ceramic green sheet formed on a base film is used as the ceramic green sheet, and a cut having the same shape as the outer periphery of the coil pattern is formed on the sheet by laser. The mold is put into the mold, and the film coated with the adhesive at the position corresponding to the mold is superimposed on the sheet, and the mold attached to the film is peeled and removed together with the film. A low-μ ceramic is inserted in the groove of the coil orbit pattern formed on the sheet. It is another object of the present invention to provide a method for laminating ceramic green sheets, comprising printing and filling a paste, forming a through hole, and then printing and forming a coil conductor pattern on the paste.

[0009]

The step of forming a coil conductor pattern on a ceramic green sheet in the method for laminating ceramic green sheets of the present invention will be described in detail below.

First, the high μ formed on the base film
A cut is made in a predetermined position on the ceramic green sheet with a laser in the same shape as the outer periphery of the winding pattern of the coil, and the mold is formed (the shape of the forming portion is the shape of the winding pattern of the coil). Next, a film coated with an adhesive is laminated on the surface of the high μ ceramic green sheet. The pressure-sensitive adhesive is applied only to the high-μ ceramic green sheet at a position corresponding to the pattern of the coil winding pattern.

[0011] As described above, by laminating the film coated with the adhesive on the surface of the high μ ceramic green sheet, the mold portion of the high μ ceramic green sheet is adhered to the film.

Next, the film is peeled and removed from the high-μ ceramic green sheet. At this time, the above-mentioned molding part (high-μ ceramic green sheet having a coil winding pattern shape) adhered to the film is peeled off together with the film and removed. Next, a low-μ ceramic paste is printed and filled in the groove of the coil orbital pattern formed on the high-μ ceramic green sheet by peeling and removing the mold-forming portion, and a predetermined amount of the low-μ ceramic paste print-filled portion is filled. A through hole for interlayer connection is formed at the position. Thereafter, a coil conductor pattern is formed by printing on the low-μ ceramic paste on which the through holes are formed.

When the ceramic green sheets on which the coil conductor patterns are formed by the above-described method are stacked in such a manner that, for example, a primary coil and a secondary coil are provided inside a ceramic body, a cross section of the stacked body is obtained. Is as shown in FIG.

That is, as can be seen from FIG. 2, the laminated body manufactured by the method of the present invention has a low μ member 1 around the coil orbital pattern (coil conductor pattern 7).
As a result, the leakage magnetic flux between the orbital patterns in the internally provided coil is prevented. Therefore, the energy of the primary side can be transmitted to the secondary side extremely efficiently.

Hereinafter, the present invention will be described in more detail by way of examples. However, the scope of the present invention is not limited by the following examples.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the method of the present invention, a method of manufacturing a laminated body constituting a laminated transformer using the method of the present invention will be described below.

First, a high μ ceramic green sheet 2 is formed on a base film 1 (FIG. 1A), and a laser beam is applied to a predetermined position in the high μ ceramic green sheet 2 to form a circular pattern of a primary coil. A cut 3 having the same shape as the outer periphery (the size of which is slightly larger than the winding pattern of the coil) was made (FIG. 1).
(B)).

Next, a film 4 coated with an adhesive is superimposed on the surface of the high-μ ceramic green sheet 2 at the portion cut by the cut 3, that is, at the position corresponding to the cut portion of the coil orbiting pattern. Then, the mold portion of the high μ ceramic green sheet 2 was bonded to the film 4 (FIG. 1C).

Next, the mold portion adhered to the film 4 was peeled off together with the film 4 and removed (FIG. 1).
(D)). Next, the low-μ ceramic paste 5 is inserted into the groove of the coil wrapping pattern formed on the high-μ ceramic green sheet 2 by peeling and removing the molding portion.
Was printed and filled (FIG. 1 (e)), and through holes 6 for interlayer connection were formed at predetermined positions in the paste 5 (FIG. 1 (f)). Thereafter, a coil conductor pattern 7 having the primary coil 8 formed by laminating and connecting through holes was formed on the low-μ ceramic paste 5 having the through holes formed thereon by printing (FIG. 1 (g)). Thereafter, the base film was peeled off.

On the other hand, in the same manner as described above, a coil conductor pattern 7 constituting the secondary coil 9 is formed by laminating and connecting through holes to the ceramic green sheet 2 of high μ, and these sheets are fixed to a predetermined size. And pressure bonding to obtain a laminate as shown in FIG.

[0021]

According to the method of laminating ceramic green sheets of the present invention, since the area around the coil conductor is made of a low-μ material, the leakage magnetic flux between the orbital patterns of the internally provided coil can be prevented. Therefore, in a laminated electronic component in which a primary coil and a secondary coil are provided, there is almost no leakage magnetic flux in the magnetic flux flowing to the primary side, and the magnetic flux penetrates to the secondary side. Is transmitted without being reduced, and the connectivity is improved. In addition, the method of the present invention has a very wide range of application because a laminated body can be formed very easily even with a large ceramic green sheet.

[Brief description of the drawings]

FIG. 1 is a view showing stepwise a coil conductor pattern forming step in a method for laminating ceramic green sheets of the present invention, wherein (a) is a perspective view showing a high μ ceramic green sheet formed on a base film; FIG. 2B is a perspective view showing a state in which a cut is made in the high μ sheet of FIG. 2A, and FIG. 2C is a state in which a film coated with an adhesive is attached to the sheet surface of FIG. Perspective view showing an embodiment of
(D) is a perspective view showing an aspect when the film is peeled off,
(E) is a perspective view showing an aspect when a low-μ ceramic paste is printed and filled in the groove, (f) is a perspective view showing an aspect when a through hole is formed at a predetermined position, and (g) is a low-μ aspect.
It is a perspective view which shows the aspect when the coil conductor pattern is formed on the ceramic paste of FIG.

FIG. 2 is a side cross-sectional view showing an example of a laminated body constituting a laminated transformer manufactured by the method for laminating ceramic green sheets of the present invention.

FIG. 3 is a side sectional view showing an example of a laminate constituting a laminate transformer manufactured by a conventional method of laminating ceramic green sheets.

4A and 4B are diagrams showing a conventional method for laminating ceramic green sheets in a stepwise manner, wherein FIG. 4A is a perspective view showing a high μ ceramic green sheet formed on a base film, and FIG. FIG. 2 is a perspective view showing a mode when a low-μ ceramic paste is printed on a μ ceramic green sheet, FIG. 3 (c) is a perspective view showing a mode when a through-hole is formed at a predetermined position, and FIG. It is a perspective view which shows the aspect at the time of forming a coil conductor pattern on the ceramic paste of FIG.

[Explanation of symbols]

 1 Base film 2 High ceramic green sheet 3 Cut 4 Film 5 Low ceramic paste 6 Through hole 7 Coil conductor pattern 8 ‥‥ Primary coil 9 ‥‥‥ Secondary coil 10 ‥‥‥ Flux 11 ‥‥‥ High μ material part 12 部 Low μ material part

Claims (1)

(57) [Claims] 1. A ceramic green sheet in which a through hole and a coil conductor pattern are formed on a plurality of ceramic green sheets, and these sheets are laminated and connected to a through hole in a configuration in which a helical coil is embedded inside a ceramic body. In a method for laminating sheets, a high-μ ceramic green sheet formed on a base film is used as the ceramic green sheet, and a cut having the same shape as the outer periphery of the coil pattern is cut into the ceramic green sheet with a laser. Make a mold
A film coated with an adhesive at a position corresponding to the molding portion is overlaid on the sheet, the molding portion adhered to the film is peeled off together with the film, and the coil wrap formed on the sheet by removing the molding portion is removed. A method for laminating ceramic green sheets, comprising: printing and filling a low-μ ceramic paste into a pattern-shaped groove portion, forming a through hole, and then printing and forming a coil conductor pattern on the paste.