JP3109872B2 - Solidified laminated toroidal coil and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solidified laminated toroidal coil in which a plurality of conductors are provided and connected in an electrically insulating magnetic laminate, one conductor coil is formed and sintered, and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional chip inductor formed by laminating an electrically insulating magnetic material and a conductor. An electrically insulating magnetic material 9 made of nickel (Ni) / zinc (Zn) ferrite or the like having a high relative magnetic permeability characteristic is formed by two upper and lower magnetic thick plate layers and a middle conductive print layer, and is integrally fired. It is united and integrated. One conductor coil 1 meandering on a plane
No. 2 is printed so as to be sandwiched between the magnetic printing layers to form one printing layer, or a plurality of printing laminations with the magnetic printing layer. Both ends of the conductor coil 12 are drawn out to opposing side surfaces of an electrically insulating magnetic body (hereinafter, referred to as a magnetic body), and are connected to the external electrodes 13 and 14 on both end faces provided after firing to form a chip inductor. I have. The chip inductor shown in FIG. 4 is applied for preventing high-frequency noise in a high-frequency band.

[0003]

Since the conventional chip inductor has a small inductance value, it has useful characteristics in a high frequency range, and is used as an inductor for electromagnetic noise components. In (2), the inductance value can be increased by reducing the meandering interval of the conductor coil 12 and increasing the number of meandering operations. However, in order to increase the stray capacitance of the conductor coil 12, the meandering interval is reduced and the number of meandering operations is increased. Practical use of inductors in high frequency bands is difficult. SUMMARY OF THE INVENTION An object of the present invention is to provide a solidified laminated toroidal coil which is small in size and high in inductance, and a method for manufacturing the same.

[0004]

According to the present invention, a T-shaped pattern is provided on one end face connected to an exposed electrode surface, and on the same circumference connected to the T-shaped pattern on the same surface of the T-shaped pattern. A plurality of radially arranged oblong patterns adjacent to each other at equal intervals, and a cylindrical hole orbiting the outer periphery and inner periphery having dimensions equal to the width of the oblong pattern connected to both ends of the oblong pattern were provided. A magnetic sheet having an intermediate conductor pattern of the same dimensions in which the cylindrical hole of the raw magnetic sheet (hereinafter referred to as a magnetic sheet) is embedded with a conductor is printed by lamination,
After repeating and printing the required number of times of lamination and printing of the intermediate conductor pattern, the adjacent inner peripheral cylindrical conductor and the outer peripheral cylindrical conductor of the cylindrical conductor of the intermediate conductor pattern are connected to form a continuous winding. To form a coil, an intermediate conductor pattern is connected by a number of oblique radial oblong conductor patterns adjacent at equal intervals on a circumference formed obliquely radially,
An L-shaped pattern connected to an oblique radial long circle conductor pattern on the same plane as the oblique radial long circle pattern and connected to an electrode on the opposite end face to the T-shaped pattern so as to go around the oblique radial oval pattern By laminating the magnetic sheets formed with the above, a solidified laminated toroidal coil having a toroidal coil-shaped circuit similar to the shape enclosing the toroidal core formed of a printed conductor is formed inside the magnetic layer.

That is, according to the present invention, a first magnetic raw sheet on which a T-shaped pattern connected to one external electrode and a radial oval conductor pattern are printed, and an L-shaped electrode connected to the other external electrode are provided.
A T-shaped pattern and an L-shaped pattern, laminated between a first magnetic raw sheet and a second raw magnetic sheet printed with a letter pattern and oblique radial oval conductor patterns; To form a columnar conductor by filling a conductive paste at outer and inner peripheral positions corresponding to both ends of the radial elongated round conductor pattern and the oblique radial elongated round conductor pattern. A third magnetic raw sheet provided with a cylindrical hole is laminated, and in the magnetic layer formed by lamination, the cylindrical conductor on the outer peripheral side, an oblong radial oval conductor pattern,
The cylindrical conductor on the inner peripheral side and the radial oval conductor pattern are connected in this order, and the cylindrical conductors on both ends are connected to the T-shaped pattern and the L-shaped pattern to form one conductor coil. It is a solidified laminated toroidal coil characterized by the above-mentioned.

Further, according to the present invention, a soft magnetic ferrite slurry to which a ferrite powder having a high relative magnetic permeability and a high specific resistance and a resin binder such as methyl cellulose are added is formed on a resin film by a doctor blade method or the like. After peeling the sheet from the resin film and cutting it to a predetermined length, a T-shaped pattern connected to the electrodes and a radial long round conductor pattern are printed on the cut raw magnetic sheet with a conductive paste made of silver palladium A magnetic body having a base conductor pattern formed by molding, and having a cylindrical hole on an outer periphery and an inner periphery corresponding to one end of the T-shaped pattern and both end positions of the radial oblong conductor pattern on the base conductor pattern. Positioning and laminating sheets based on at least two or more positioning holes provided in the base conductor pattern and each magnetic material sheet , By printing a conductive paste comprising silver-palladium in the cylindrical hole filled with said cylindrical hole,
After forming a columnar conductor by repeating the lamination of the magnetic sheet having the columnar hole and the printing of the conductor paste on the columnar hole, an outer conductor and an inner conductor of the columnar conductor are formed. A raw magnetic sheet having an oblique radial conductor pattern formed of an oblong conductor pattern connected to form one conductor coil and an upper conductor pattern formed with an L-shaped conductor pattern connected to the electrodes is laminated, and the stack is formed by a 200 A method for producing a solidified laminated toroidal coil, comprising laminating by heating and pressing at a temperature of 900 ° C., sintering in the air at 900 ° C. to 1200 ° C., and forming electrodes by attaching electrodes.

[0007]

The radially round conductor pattern formed on the upper and lower surfaces of the laminated magnetic layer is connected to both ends of the obliquely radially elongated conductor pattern, and the intermediate layer conductor pattern is formed on the inner and outer circumferences in a direction perpendicular to the laminated surface. Since it has a structure in which a toroidal coil is formed inside a laminated magnetic layer formed in a circular column shape, the interval between the cylindrical conductor on the outer periphery of the intermediate layer conductor and the cylindrical conductor on the inner peripheral side, Although the value of the inductance changes depending on the number of the intermediate layer conductors corresponding to the number of turns, the solidified laminated toroidal coil according to the present invention has a small size and a high inductance value because the structure is the same as that of the toroidal coil.

Further, by selecting the thickness of the magnetic layer to be laminated for forming the intermediate conductor pattern, a solidified laminated toroidal coil having a small inductance to a large inductance can be easily formed.

The temperature at which the laminated magnetic sheets are heated and pressed varies depending on the material of the binder added to the magnetic sheets, and the final sintering temperature varies depending on the ferrite composition and the conductor composition. ° C ~ 120
It is carried out at a temperature between 0 ° C.

[0010]

FIG. 1 is a perspective view showing one embodiment of a solidified laminated toroidal coil according to the present invention. A ferrite powder having a high specific resistance, for example, a nickel (Ni) / zinc (Zn) ferrite powder and a binder resin such as methyl cellulose are mixed and kneaded to form a magnetic paste on a resin film by a doctor blade method or the like. The magnetic raw sheet having a thickness of, for example, about 40 μm is formed by further peeling, and cut into a predetermined size to form a magnetic material sheet 1. Printing for forming a coil on the magnetic material sheet is performed on the magnetic material sheet 1 with a conductive paste made of silver and palladium.

FIG. 2 is a plan view of a conductor of each laminated magnetic sheet. First, on the upper surface of the lowermost magnetic sheet, a T-shaped pattern 2a connected to the exposed electrode portion, and a plurality of elongated round conductor patterns 2 adjacent at equal intervals on the same magnetic sheet surface
b is radially conformed to the shape of the magnetic material sheet. For example, when the magnetic material sheet is square, it is arranged in a circular shape, and when the magnetic material sheet is a rectangular shape, it is arranged in an elliptical shape to form one base conductor pattern 2.
The base conductor pattern 2 is a conductor pattern having a conductor width of, for example, 0.25 mm and a long round conductor pattern having a length of, for example, 4 mm.
Printing is repeated to a thickness of about 40 μm.

Next, as an example, a magnetic layer having a thickness of 40 μm to 400 μm is provided on the underlying conductor pattern 2 at positions corresponding to both ends of the elongated conductor pattern 2b of the radial conductor of the underlying conductor pattern (FIG. 2B). 2 are laminated on the perforated magnetic sheet 3 provided with the cylindrical holes 3a at the positions shown in FIG. 2, and the holes shown in FIG. 2B are formed on the perforated magnetic sheet 3 by the conductor pattern shown in FIG. A conductor made of silver palladium is repeatedly printed and filled at the positions of the cylindrical holes of the perforated magnetic sheet. After the conductors are filled in the cylindrical holes of one magnetic sheet, the magnetic sheets with the cylindrical holes 3a shown in FIG. 2B are laminated again, and then the intermediate layer conductor pattern shown in FIG. The step of filling the cylindrical hole at the position 4 with a conductor made of silver palladium is repeated, the magnetic sheets are laminated, and the cylindrical hole is filled with the conductor to form a coil conductor.

After laminating the magnetic material sheet to a predetermined thickness to form a columnar conductor, the magnetic material sheet is placed on the back surface of FIG.
Is printed to a thickness of about 40 μm.
2 (a) facing the cylindrical conductor shown in FIG. 2 (c).
2 and (d) shown in FIG. 2 (d), and laminated by heating and pressing at about 200 ° C.
After sintering in air for about 2 hours to form a sintered body, dip-coating a silver-palladium paste containing glass frit in the form of electrode 8 in FIG. 3 and then sintering for about 1 hour at a temperature of about 600 ° C. To form the solidified laminated toroidal coil of the present invention.

In the embodiment of the present invention, nickel-zinc ferrite is used as a material for forming a magnetic layer. However, nickel-zinc-copper ferrite and the like have a high relative permeability and are inherent in the material. Any magnetic material having a high resistance may be used. The conductor material is not limited to a conductor paste made of silver or silver palladium, but may be any other metal alloy or an oxidation-resistant metal material. On the other hand, for positioning for laminating the magnetic material layers, at least two or more holes for positioning are made at the end of the cut magnetic raw sheet, and the magnetic raw sheets are laminated and positioned by the positioning holes.

[0015]

As described above, the solidified laminated toroidal coil according to the present invention is formed by laminating a magnetic raw sheet and forming a conductor by printing on the magnetic raw sheet. By changing the conductor pattern, the inductance value can be obtained with any value of inductor, the inductance value can be easily adjusted, and by changing the thickness of the magnetic sheet, a small solidified laminated toroid and The manufacturing method can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a method for manufacturing a solidified laminated toroidal coil according to the present invention.

FIGS. 2A and 2B are diagrams showing conductors forming a solidified laminated toroidal coil formed on a raw magnetic material sheet. FIG. 2A is a plan view of a base conductor pattern, and FIG. FIG. 2C is a plan view showing a pattern diagram of a cylindrical hole formed in a sheet, FIG. 2C is a plan view of a conductor pattern printed on the cylindrical hole, and FIG. 2D is a plan view of an upper conductor pattern.

FIG. 3 is an external perspective view of a solidified laminated toroidal coil according to the present invention.

FIG. 4 is a perspective view showing a conventional laminated inductor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic raw sheet 2 Base conductive pattern 2a T-shaped pattern 2b Oval conductive pattern 3 Magnetic raw sheet 3a Column-shaped hole 4 Intermediate layer conductive pattern 6 Upper ground conductive pattern 6a L-shaped pattern 6b Oval conductive pattern 8 Electrode 9 (electric insulating) magnetic material 12 conductor coil 13, 14 external electrode 15 solidified laminated toroidal coil

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 17/00-17/06 H01F 41/04-41/08

Claims (2)

(57) [Claims] A first magnetic raw sheet on which a T-shaped pattern connected to one external electrode and a radial oval conductor pattern are printed, and an L-shaped pattern connected to the other external electrode and an oblique radial pattern A second magnetic raw sheet printed with an elongated round conductor pattern, laminated between the first and second raw magnetic sheets, and ends of the T-shaped pattern and the L-shaped pattern; A cylindrical hole for filling a conductive paste to form a cylindrical conductor is provided at positions on the outer peripheral side and the inner peripheral side corresponding to both ends of the oblong radial conductor pattern and the oblique radial oblong conductor pattern. In the magnetic layer formed by laminating the magnetic raw sheets of No. 3 above, the cylindrical conductor on the outer peripheral side, the oblong radial oval conductor pattern, the cylindrical conductor on the inner peripheral side, the radial length Connect the circular conductor patterns in order and make the ends cylindrical The conductor is connected to the T-shaped pattern and L
A solidified laminated toroidal coil characterized by forming one conductor coil by connecting to a V-shaped pattern. 2. A sheet formed by applying a ferrite powder having a high relative magnetic permeability characteristic and a high specific resistance and a soft magnetic ferrite slurry to which a resin binder such as methyl cellulose is added on a resin film by a doctor blade method or the like. After peeling and cutting to a predetermined length, a T-shaped pattern and a radial oval conductor pattern to be connected to the electrodes are printed and molded with a conductive paste made of silver palladium on the cut raw magnetic sheet. Forming a conductor pattern, one end of the T-shaped pattern on the underlying conductor pattern, outer periphery corresponding to both end positions of the radial elongated round conductor pattern, a magnetic raw sheet having a cylindrical hole on the inner periphery side, The base conductor pattern and at least two or more positioning holes provided in each of the raw magnetic sheets are positioned and laminated with reference to the circle. Filling the cylindrical holes by printing a conductive paste made of silver palladium on the columnar holes, repeating the lamination of the raw magnetic sheet having the cylindrical holes and printing on the cylindrical holes of the conductive paste. After forming the columnar conductor, an oblique radial conductor pattern composed of an oblong conductor pattern forming one conductor coil by connecting the outer conductor and the inner conductor of the columnar conductor, and L connecting to the electrode. The raw magnetic sheet having the upper conductor pattern formed with the U-shaped conductor pattern is laminated, heated and pressed at 200 ° C., laminated, and then sintered at 900 ° C. to 1200 ° C. in the air to form an electrode. A method for producing a solidified laminated toroidal coil.